We Are Usually Asked About

Q1 .Waterborne VS Solvent Coatings VS Powder Coatings

Waterborne Coatings:

Waterborne coatings are made with water as the primary solvent, which makes them more environmentally friendly than solvent-based coatings.
Because water is used as the primary solvent, these coatings have lower VOC (volatile organic compounds) emissions, making them less harmful to the environment and to human health.
Waterborne coatings have a faster drying time than solvent-based coatings, which makes them more convenient to use and can result in less down-time for the project.
Waterborne coatings are generally considered to be more flexible and can better cope with movements in the substrate, which makes them suitable for certain types of substrates and under certain environmental conditions.
They have good durability, chemical resistance and UV resistance.

Solvent-based Coatings:

Solvent-based coatings are made with organic solvents such as mineral spirits or xylene.
These coatings have a strong odor and are flammable.
Solvent-based coatings have a longer drying time than waterborne coatings, which can make them less convenient to use and may result in more down-time for the project.
They have a harder finish than waterborne coatings and are less flexible, which makes them more suitable for certain types of substrates and under certain environmental conditions.
They have good durability, chemical resistance and UV resistance.

Powder Coatings:

Powder coatings are a dry coating process in which a powder made of pigment and resin is applied to a surface and then heated to melt and fuse the powder into a protective layer.
These coatings are considered environmentally friendly because they do not release any VOCs into the air during the application process and have no solvents or liquids.
Powder coatings have good durability, chemical resistance and UV resistance.
They have good thickness and provide a smooth finish with no drips or runs.
They are available in a wide range of colors, textures, and gloss levels.
They can be applied to a variety of substrates including metal, plastic, and wood.

It’s important to note that each coating type has its own set of advantages and disadvantages, and it will depend on the specific application and requirements of the project, such as the type of surface to be coated, the environment in which the coating will be used, and the desired finish, to determine which coating type is the most appropriate.

Q2. What is the advantage and disadvantage of electrostatic/conventional airless and air spray ?

Auto Electrostatic Spray Gun System Paint Saving

Introducing the latest in paint saving technology - our auto electrostatic spray gun system. Using state-of-the-art electrostatic technology, our system ensures optimal paint coverage while reducing overspray and material waste. With our system, you can achieve a professional finish while saving on paint costs. Upgrade your paint shop today with our cutting-edge auto electrostatic spray gun system.

Electrostatic spray and conventional airless spray are both methods used to apply industrial coatings, but they have different advantages and disadvantages.

Electrostatic Spray:

Advantages:
- High efficiency, as the electrostatic charge attracts the paint particles to the surface, resulting in less overspray and more precise application.
- High finish quality, as the electrostatic charge causes the paint particles to align and flow together, resulting in a smoother, more even finish.
- Suitable for small particles and intricate surfaces.
Disadvantages:
- Can be sensitive to ambient conditions, such as humidity and temperature, which can affect the electrostatic charge and the application of the paint.
- Requires specialized equipment and training to operate correctly.

Conventional Airless Spray:

Advantages:
- High fluid delivery, resulting in faster application and greater coverage.
- Suitable for larger particles and more rugged surfaces.
Disadvantages:
- Produces overspray and results in a rougher finish with lower quality.
- Can be less efficient and less precise than electrostatic spray.

Air Spray:

Advantages:
- Can produce a very fine finish, similar to electrostatic spray.
- Suitable for small particles and intricate surfaces.
Disadvantages:
- Lower efficiency than electrostatic spray and conventional airless spray, due to high overspray.
- Can be sensitive to ambient conditions, such as humidity and temperature, which can affect the application of the paint.
- requires specialized equipment and training to operate correctly.

It’s important to note that the best method for a specific project depends on the specific application and requirements, such as the type of surface to be coated, the environment in which the coating will be used, and the desired finish.

Q3. Does electrostatics work only when spraying metal pieces ?

Ans.

When using electrostatic spraying, the paint particles are given an electrostatic charge which causes them to be attracted to a conductive surface. When the paint particles come into contact with the surface they are being sprayed on, the electrostatic charge is neutralized and the paint particles adhere to the surface. This process allows for more precise and efficient application of the paint, as the paint particles are attracted to the surface they are supposed to be applied to, rather than just bouncing off or being blown away by the air spray.

This method can be used on a wide range of surfaces, including metal, plastic, wood, and even some non-conductive surfaces such as glass. For non-conductive surfaces, a conductive primer can be applied first, which creates a conductive layer on the surface and allows the electrostatic charge to be conducted through the surface and attract the paint particles to it. Another way is to put the non-conductive piece between the applicator and a conductive grounded surface, this will make the electrostatic charge can be conducted through the surface and attract the paint particles to it.

It’s important to note that not all electrostatic spraying equipment is suitable for all surfaces and it’s important to consult with the equipment provider for the best process for a specific surface. Also, some electrostatic equipment may require specific surface preparation and cleaning, such as degreasing or sandblasting, to ensure proper adhesion of the paint

Q4. Why should I choose an electrostatic spray gun over a conventional spray gun ?

There are several reasons why you may choose an electrostatic spray gun over a conventional spray gun:

High Transfer Efficiency: Electrostatic spray guns have a very high transfer efficiency, typically between 40-98%. This means that more paint is being transferred to the surface being sprayed, and less is being wasted as overspray. This results in lower paint costs, as well as less VOC emissions and less cleanup.
Precise Application: Electrostatic spray guns use an electrostatic charge to attract the paint particles to the surface being sprayed, which allows for more precise application and less overspray. This is particularly useful for intricate surfaces or areas that are hard to reach with a conventional spray gun.
High Finish Quality: The electrostatic charge causes the paint particles to align and flow together, resulting in a smoother and more even finish. This is particularly useful for applications where a high-quality finish is required.
Greater Productivity: Because of the high transfer efficiency and precise application, electrostatic spray guns can result in faster production and less downtime.
Versatility: Electrostatic spray guns can be used on a wide range of surfaces including metal, plastic, wood, and even some non-conductive surfaces such as glass.

It’s important to note that electrostatic spray guns tend to be more expensive than conventional spray guns, and they require specialized equipment and training to operate correctly. Also, electrostatic spraying can be sensitive to ambient conditions, such as humidity and temperature, which can affect the electrostatic charge and the application of the paint.

Q5. How does a rotary atomizer work and where should I consider using one ?

Ans.

A rotary atomizer is a type of spray gun that works by spinning a bell or disk at high speed (up to 80,000 RPM). This high speed, along with the serrated edge of the bell or disk, provides an excellent means for atomization, which is the process of breaking up a liquid into tiny droplets. The high-speed rotation creates a centrifugal force that pulls the coating material towards the outer edge of the bell or disk, where it is then atomized into fine droplets by the serrated edge.

One of the main advantages of using a rotary atomizer is its high fluid delivery rate, which can be up to 3000 cc/min. This means that the gun can apply a large amount of coating material in a short amount of time, making it ideal for high-volume coating operations. Additionally, rotary atomizers can provide an even finish, which makes them suitable for applications where a high-quality finish is required.

Another advantage of rotary atomizers is that they can be automated. This means that they can be integrated into automated coating systems, which increases productivity and reduces the need for manual labor.

Some of the applications where a rotary atomizer may be considered include industrial coating, automotive coating, and wood coating. They may also be used in the food and beverage industry, such as for coating chocolate or sugar, as well as in the pharmaceutical industry for coating pills.

It’s important to note that rotary atomizers tend to be more expensive than other types of spray guns, and they require specialized equipment and training to operate correctly. Additionally, they can be sensitive to the viscosity of the coating material and the ambient conditions such as temperature and humidity.

Q6. Do I need to purchase equipment specifically for a waterborne paint ?

Ans.

In general, yes, you may need to purchase equipment specifically designed for use with waterborne paints. This is because waterborne paints are highly conductive and can cause damage to equipment not designed to handle them.

Waterborne paints have different viscosity, conductivity, and flow properties compared to solvent-borne paints, which means that the equipment used to apply them must be designed to accommodate these differences. For example, the paint supply and fluid lines must be isolated to prevent electrical current from flowing through them and causing damage. Additionally, power supplies must be designed to accommodate the higher current draw of waterborne paints.

However, some manufacturers like OTSON ALL Liquid electrostatic spray equipment are able to use water-based and solvent-based paints without any problem. It’s important to check with the equipment provider to make sure that their equipment is suitable for use with waterborne paints

It’s also important to note that using equipment specifically designed for solvent-borne paints to spray waterborne paints can be dangerous and may result in equipment damage. So, it’s essential to use the right equipment for the right paint.

Q7. Can electrostatics be used to paint something other than metal? if so, will you get the same benefits as spraying metal electrostatically ?

Ans.

Yes, electrostatic spraying can be used to paint a variety of surfaces other than metal. However, some surfaces may require pretreatment with chemical sensitizers to create a conductive surface for the electrostatic charge to be attracted to. For example, some plastics, wood, and ceramics may require a conductive primer or the use of a metal object placed behind the part to create a ground image for attraction.

The electrostatic charge in the paint causes it to be attracted to any conductive surface, whether it is metal, plastic, or wood. For non-conductive surfaces, a conductive primer can be applied first, or the piece can be placed between the applicator and a conductive grounded surface. This allows the electrostatic charge to be conducted through the surface and attract the paint particles to it, resulting in a more precise and efficient application.

Even though the benefits of electrostatic spraying are not the same when it comes to non-metal surfaces, the many advantages and savings associated with electrostatic spraying justify the application of a pretreatment or preparation product. Materials, maintenance, labor, and filter savings alone help justify an electrostatic application, not to mention increased production.

It’s important to note that not all electrostatic spraying equipment is suitable for all surfaces and it’s recommended to consult with the equipment provider for the best process for a specific surface.

Q8. Will painting electrostatically provide better adhesion ?

Ans.

Painting electrostatically will provide better transfer efficiency, as more paint is being transferred to the surface being sprayed, and less is being wasted as overspray. However, it does not necessarily provide better adhesion. Adhesion is the ability of the paint to stick to the surface it is being applied to and depends on the condition of the substrate and the properties of the paint.

Proper surface preparation is crucial for good adhesion, regardless of whether the paint is being applied electrostatically or conventionally. This includes cleaning, degreasing, and sanding the surface to remove any contaminants or imperfections that could affect the adhesion of the paint.

It’s important to note that some electrostatic spraying equipment may require specific surface preparation and cleaning, such as degreasing or sandblasting, to ensure proper adhesion of the paint.

In summary, while electrostatic spraying provides better transfer efficiency, it does not necessarily provide better adhesion. Proper surface preparation is key for a good paint job, regardless of the application method.

Q9. Can waterborne paints be sprayed electrostatically ?

Ans.

Yes, waterborne paints can be sprayed electrostatically. In fact, they are highly conductive and therefore ideal for electrostatic applications. Electrostatic spraying uses an electrostatic charge to attract the paint particles to the surface being sprayed, which allows for more precise application and less overspray.

However, when spraying waterborne paint electrostatically, the charge will be carried back to the fluid-supply system. This means that the paint-supply system must be isolated from contact with people to prevent any electrical hazards. Special hardware is required for this purpose, such as an isolation stand and cage or voltage-blocking system. Various types of isolation devices are available, depending on the application and manufacturer.

It’s important to note that not all electrostatic spraying equipment is suitable for use with waterborne paints, so it’s recommended to consult with the equipment provider to ensure that the equipment is appropriate for the intended application. Additionally, waterborne paint electrostatic spraying requires specialized training and knowledge to ensure safety and proper operation.

Q10 .What needs to be grounded when using electrostatic guns ?

Ans.

Yes, that is correct. When using electrostatic guns, it is important to ensure that all equipment, personnel, and target parts in the spray booth area are grounded. This includes the object being sprayed, the electrostatic gun, and the fluid supply. Any ungrounded object, or person, in the spray area can become electrically charged and can cause static sparks, which can result in fire or electric shock if proper grounding is not in place.

Proper grounding of all equipment and surfaces in the spray booth area is crucial for safety and to ensure that the electrostatic charge is properly applied to the paint particles. Improper grounding can result in a poor paint job, and also it may cause electrical hazards and accidents. It is important to follow the manufacturer’s instructions and safety guidelines when grounding the equipment, and personnel should be trained on the proper grounding procedures.

When using electrostatic guns, it is important to ground the object being sprayed, as well as the electrostatic gun and the fluid supply.

Object being sprayed: The object being sprayed must be grounded in order for the electrostatic charge to be attracted to it and for the paint particles to adhere to the surface. This can be achieved by connecting the object to a ground wire or by using a conductive primer on non-conductive surfaces.
Electrostatic gun: The electrostatic gun must also be grounded in order to prevent the buildup of static electricity and to ensure that the electrostatic charge is properly applied to the paint particles.
Fluid supply: The fluid supply, including the paint hose and container, should also be grounded to prevent the buildup of static electricity and to ensure that the electrostatic charge is properly applied to the paint particles.

It’s important to note that the grounding process is a safety measure that ensures that any stray voltage is safely dissipated and prevents electrical hazards. It is important to follow the manufacturer’s instructions when grounding the electrostatic gun and fluid supply.

Q11. What is the best way to check the voltage of an electrostatic spray systems( disk ,gun , bell ) ?

Ans.

The OTS-7 Electrostatic Power Meter is designed to measure the voltage output of an electrostatic gun within a range of 0 KV to 200 KV. This wide range allows for accurate measurement of voltage output for different types of electrostatic guns and power supplies. The ability to measure such high voltage output is important as it ensures that the electrostatic gun is operating within the manufacturer’s recommended range and providing the appropriate electrostatic charge for optimal paint transfer. It’s important to follow the manufacturer’s instructions and safety guidelines when using the OTS-7 Electrostatic Power Meter to ensure accurate measurements and avoid any electrical hazards.

Q12. What is the difference between a cascade and a classic type power supply ?

Ans.

The difference between a cascade type power supply and a classic type power supply is in the way they generate and deliver the high voltage required for electrostatic spraying.

A cascade-type power supply starts by sending out a low voltage, which is then stepped up at the transformer on the electrostatic gun. This type of power supply often uses a series of transformers to increase the voltage to the desired level. The advantage of this type of power supply is that it is more efficient and generates less heat, making it more reliable and durable.

A classic type power supply, on the other hand, immediately sends out the required high voltage. This type of power supply uses a single transformer to generate the high voltage. The advantage of this type of power supply is that it is simple to operate and may be less expensive than a cascade type power supply. However, it is less efficient and generates more heat, which can reduce its reliability and lifespan.

It’s important to note that different type of power supply has different features and advantages, it’s important to consult with the equipment provider to ensure that the equipment is appropriate for the intended application.

Q13. Paints and Coatings Type

Ans.

The OTSON all electrostatic spray systems can apply nearly all types of solvent-borne and waterborne coatings. The conductivity of the paint, or its ability to carry an electrical charge, is an important factor in electrostatic spraying. The paint to be used should be conductive enough to accept the negative charge from the spray gun but not so conductive that the charged paint tracks back to the ground through the paint system supply. Waterborne and metallic coatings tend to be highly conductive, while solvent-borne coatings tend to be non-conductive. Paints can be modified with a polar solvent (e.g. alcohols or ketones) or conductive pigments (e.g. metallic pigments) to increase their conductivity. Likewise, highly conductive coatings can be modified to prevent the electrical charges from shorting to the ground and leaving the paint uncharged. To obtain an appropriate charge, the impedance of the coating should be between 20M ohm to 30 M ohm. Viscosity corrections may also need to be made to ensure coating droplets are fine enough. Different types of coatings have different properties and applications, such as melamine coatings for cars, boats and metal, polyester-melamine for furniture and electrical equipment, polypropylene coatings for wooden furniture, polyurethane coatings for motorcycles and medical equipment, and water-soluble paints for wooden and metal surfaces.

Solvent-borne: Coatings in which VOCs are the major solvent or dispersant.
Polar: Descriptive of molecules where the atoms and their electrons and nuclei are arranged so that one end of the molecule has a positive electrical charge and the other end of the molecule has a negative electrical charge. The greater the distance between the two charged ends, the higher the polarity. Polar molecules ionize in solution and impart electrical conductivity.
Viscosity: The property of a fluid whereby it tends to resist relative motion within itself. A thick liquid such as syrup has a high viscosity. Viscosity is often measured using an efflux-type cup, which gives the time required for a given quantity of paint to flow through a hole in the bottom of the metal cup at a given temperature (See Zahn Cup).
CONDUCTIVITY PROMOTER or pigments:
Some types of coatings and paints for reference.

Paints Type	Application
Melamine Coatings	Car ,Boat ,Metal
Polyester-melamine	Furniture, electrical equipment, car wheel, bicycle, Computer case
Polypropylene Coatings	Wooden, Furniture
Poly-Urethane Coatings	Motorcycle, Bicycle, Car, medical equipment, Machine, Car,
Polyurethane Coatings	Wooden, Metal, Leather, Plastic, Furniture
NC Lacquer	Wooden, Metal, Furniture
Metallic luster Coatings	Wooden, Metal, Furniture
Water Soluble Paint	Wooden, Metal, Furniture

Q14. Is your electrostatic spray system for good quality finishing ?

Yes, our OTSON electrostatic spray systems are designed for high-quality finishing. The electrostatic charge helps to attract the paint particles to the substrate, resulting in improved transfer efficiency and a more even application. This can lead to a smoother, more consistent finish with less overspray and waste. Additionally, the OTSON electrostatic spray systems are equipped with advanced technology and features that allow for precise control and adjustments to the spray parameters, such as fluid flow, air pressure, and voltage, to ensure optimal performance and quality. Our systems have been designed to be user friendly and easy to operate, which makes it easy for the operator to achieve high-quality finishes.

Our OTSON electrostatic spray systems feature a range of advanced technology and features for high-quality finishing:

High transfer efficiency: The electrostatic charge helps to attract the paint particles to the substrate, resulting in improved transfer efficiency and a more even application, which leads to a smoother, more consistent finish with less overspray and waste.
Precision controls: The systems are equipped with advanced technology that allows for precise control and adjustments to the spray parameters, such as fluid flow, air pressure, and voltage, to ensure optimal performance and quality.
Wide range of viscosity: Our systems can handle a wide range of viscosities, from low to high, allowing you to use a variety of coatings and paints with different viscosities.
User-friendly design: The systems have been designed to be user-friendly and easy to operate, which makes it easy for the operator to achieve high-quality finishes.
Versatile applications: Our systems can be used for a wide range of applications, including automotive, wood, metal, and plastic finishing, as well as industrial and commercial applications.
Easy maintenance: The systems are designed for easy maintenance, which reduces downtime and increases productivity.
Cost-effective: The systems are cost-effective, as they can save on paint, reduce overspray and cleanup, and improve production times.
Customizable: Our systems can be customized to your specific needs and requirements to ensure optimal performance and quality.
High-quality finish: OTSON electrostatic spray systems are designed to produce high-quality finishes, which are smooth and consistent with minimal overspray, resulting in less paint waste and cost savings.
High-speed production: OTSON electrostatic spray systems are designed for high-speed production, which reduces downtime and increases productivity.
Wide range of coating: OTSON electrostatic spray systems can handle a wide range of coating viscosity and types, including waterborne, solvent-borne and powder coating.
High-performance: OTSON electrostatic spray systems are designed for high-performance, with a high transfer efficiency and precise controls, which ensures optimal performance and quality.

Q15.Do I need to pre-paint the metals with anti-corrosion or ?

Yes, it is generally recommended to pre-treat metal surfaces with anti-corrosion coatings before painting. This is because metal surfaces are prone to rust and corrosion, which can compromise the integrity and appearance of the final paint job.

Pre-treatment solutions such as anti-corrosion coatings can help to protect the metal surface from rust and corrosion and provide a suitable surface for the paint to adhere to. This will ensure that the paint will last longer, look better and protect the metal surface from corrosion and rust.

OTSONprovide fully pretreatment solutions for customer, such as:

Sand blasting, chemical cleaning, degreasing, and chemical conversion coating.
Our pre-treatment solutions are designed to prepare the surface of the metal, so that the paint adheres well and provides the longest possible service life.

It’s important to note that the specific pre-treatment method will depend on the type of metal, the environment it will be exposed to, and the type of paint or coating that will be applied. OTSON team can help you to evaluate your specific needs and recommend the best pre-treatment solution for your application.

Please click the link for more information https://ai.otson.com/pretreatment-paint-shop/

Q16 How long is needing to dry liquid (waterbaed and solvent ) paint ?

Ans.

The drying time for liquid paints (waterborne and solvent-borne) can vary depending on several factors such as the type of paint, the thickness of the coating, the temperature, and the humidity.

Waterborne paints typically dry faster than solvent-borne paints. They can dry to the touch within minutes and be recoated within an hour. However, it is recommended to allow 24 hours before allowing normal use.

Solvent-borne paints, on the other hand, can take longer to dry. They typically dry to the touch within a few hours, but can take up to 24 hours to fully cure and harden. It is recommended to allow at least 24 hours before allowing normal use.

It’s important to note that these are general guidelines and the actual drying time may vary depending on the specific paint, the application method, and the environmental conditions. It is always recommended to consult the manufacturer’s instructions for more detailed information on the drying time for a specific paint

In addition to the drying time, using a curing oven can also accelerate the drying and hardening process of liquid paints, both waterborne and solvent-borne. A curing oven uses heat to dry and cure the paint, which can significantly reduce the overall curing time. The curing temperature and time will depend on the type of paint and coating being used, as well as the desired level of cure. For example, a liquid coating such as a polyurethane coating will typically require a higher curing temperature and longer curing time than an epoxy coating.

It’s important to note that not all paints and coatings can be cured in an oven, and some may require specific curing conditions such as humidity or UV light. It is always recommended to consult the manufacturer’s instructions for more detailed information on the curing requirements for a specific paint or coating.

When using a curing oven, it’s important to pay attention to the temperature and time settings to ensure that the paint or coating is cured properly. The curing temperature can range from around 150°F to 400°F, depending on the type of paint or coating being used. The curing time can also vary, with some paints or coatings requiring only a few minutes while others may require several hours.

It’s also important to monitor the curing process to ensure that the paint or coating is not overheated, as this can cause discoloration, bubbling, or other defects in the final coating. It’s also important to make sure that the oven is properly ventilated to remove any solvents or fumes that may be emitted during the curing process.

Additionally, for some paints or coatings, it’s important to also consider the environment where the curing oven is located, because high-temperature and humidity can cause issues such as cracking, sagging, and wrinkling.

In summary, it’s important to follow the manufacturer’s instructions for the specific paint or coating being used to ensure that it is cured properly and to avoid any issues with the final coating. OTSON team is available to assist customers in determining the appropriate curing process for their specific coating needs.

Q17. What type of surface preparation do I do (or not do) ?

Proper surface preparation is crucial for achieving a high-quality finish when painting or coating any surface. The type of surface preparation required will depend on the type of surface, the condition of the surface, and the type of paint or coating that will be applied. Some common surface preparation techniques include:

Cleaning: The surface must be cleaned of any dirt, dust, grease, oil, or other contaminants before painting or coating. This can be done using solvents, degreasers, detergents, or a combination of these.
Sanding: Depending on the condition of the surface, sanding may be necessary to remove any rust, loose paint, or other imperfections. Sanding can be done using various grits of sandpaper, starting with a coarse grit and progressing to a finer grit.
Etching: For metal surfaces, etching is often necessary to create a profile for the paint or coating to adhere to. Etching can be done using a chemical etchant or a sandblaster.
Priming: Priming is an optional step that can be used to improve the adhesion of the paint or coating to the surface. A primer can be applied directly to the surface or over the etch primer.
Masking: To protect adjacent areas that should not be painted, masking will be used.

It’s important to note that not all surfaces require the same level of surface preparation, and it is always recommended to consult the manufacturer’s instructions for the specific paint or coating being used to determine the appropriate surface preparation requirements. In addition, OTSON team is available to assist customers in determining the appropriate surface preparation for their specific coating needs.

There are a few other things to keep in mind when it comes to surface preparation:

Surface condition: The condition of the surface is a crucial factor in determining the appropriate surface preparation. For example, a new surface will require less preparation than an older, previously painted surface.
Surface profile: The surface profile, or the roughness of the surface, can affect the adhesion of the paint or coating. A rough surface will require less surface preparation than a smooth surface.
Surface compatibility: The surface compatibility of the paint or coating with the surface is also important. For example, certain paints or coatings may not be compatible with certain types of surfaces.
Surface cleanliness: Surface cleanliness is critical to ensure that the paint or coating adheres properly. Surface should be cleaned using a degreaser and/or detergent, then rinse thoroughly with water.
Surface dryness: Surface should be dry before painting or coating. If the surface is wet or damp, the paint or coating may not adhere properly.
Surface temperature: Surface should be at the correct temperature before painting or coating, as specified by the paint or coating manufacturer. If the surface is too cold or too hot, the paint or coating may not cure properly.

It’s also important to mention that OTSON offers full surface preparation solutions in order to guarantee the best quality finish.

In summary, proper surface preparation is essential for achieving a high-quality finish when painting or coating any surface. The type of surface preparation will depend on the type of surface, the condition of the surface, and the type of paint or coating that will be applied. OTSON team is available to assist customers in determining the appropriate surface preparation for their specific coating needs. The surface preparation includes cleaning, sanding, etching, priming, masking and other surface preparation steps. It is important to consult the manufacturer’s instructions for the specific paint or coating being used and also OTSON team is available for any support. OTSON offers full surface preparation solutions to ensure the best quality finish.

Q18. Do you have different products or regulations for paints with high or low resistivity/conductivity ?

Ans.

OTSON electrostatic spray systems are designed to work with a wide range of paint and coating types, including those with high and low resistivity/conductivity. However, certain paint types may require additional preparation or equipment adjustments to ensure proper application and finish quality.

Highly conductive paints, such as waterborne paints, can be more challenging to spray electrostatically due to their high electrical conductivity. These types of paints can cause electrical charges to travel back through the paint supply system, potentially causing damage to the equipment or even electrical shocks to the operator. To prevent these issues, special equipment, such as an isolation stand or voltage-blocking system, may be required. OTSON team is available to assist customers in determining the appropriate equipment and adjustments for their specific coating needs.
Lowly conductive paints, such as solvent-borne paints, can also pose challenges for electrostatic spraying due to their low electrical conductivity. These types of paints may require modifications to increase their conductivity, such as the addition of polar solvents or conductive pigments. In addition, viscosity corrections may also need to be made to ensure coating droplets are fine enough.

Resistivity and conductivity are two important parameters that describe the electrical properties of a material. Resistivity is a measure of a material’s resistance to electrical current flow, while conductivity is a measure of a material’s ability to conduct electrical current. The inverse of resistivity is conductivity.

In general, materials that have high resistivity have low conductivity, and vice versa. For example, materials such as rubber and plastic have high resistivity and low conductivity, while materials such as copper and aluminum have low resistivity and high conductivity.

Resistivity and conductivity are related properties that describe how easily an electric current can flow through a material. Resistivity is a measure of how difficult it is for an electric current to flow through a material, and is typically measured in ohm-meters (Ωm). The higher the resistivity, the more difficult it is for an electric current to flow through the material. On the other hand, conductivity is a measure of how easily an electric current can flow through a material, and is typically measured in siemens per meter (S/m). The higher the conductivity, the more easily an electric current can flow through the material.

For OTSON electrostatic spray systems, the resistivity/conductivity range is typically between 20MΩm to 30MΩm. Paints and coatings that fall within this range have the appropriate conductivity to allow the electrostatic charge to flow through the paint, while not being too conductive that the charge tracks back to the ground through the paint system supply. Coatings with lower resistivity/conductivity may require additional treatment or modification to increase the resistivity/conductivity.

It’s important to note that while conductivity is a desirable property in electrostatic spraying, it is not the only factor that determines the quality of the finish. Other factors such as viscosity, surface tension, and solvent evaporation also play a role in the quality of the finish. OTSON team can assist customers in selecting the appropriate coating and making any necessary modifications to ensure optimal performance in the electrostatic spray system.

In summary, resistivity and conductivity are two important parameters that describe the electrical properties of a material and play a crucial role in electrostatic spray systems. The OTSON Electrostatic Spray System is able to work with a wide range of paint resistivity/conductivity, but adjustments can be made to the paint to ensure optimal coating transfer efficiency.

OTSON electrostatic spray systems are designed to handle a wide range of resistivity/conductivity levels in paints and coatings. The OTSON electrostatic spray system is able to handle a resistivity/conductivity range of 20M ohm to 30 M ohm to obtain an appropriate charge. However, if a coating falls outside of this range, changes can be made to make the coating more conductive, including solvent additions, changes in solvent composition, and the use of polar solvents. Additionally, viscosity corrections may also need to be made to ensure coating droplets are fine enough. It’s important to note that the conductivity of the paint or coating is an important factor in electrostatic spraying, and it is always recommended to consult the manufacturer’s instructions for the specific paint or coating being used to determine the appropriate resistivity/conductivity requirements. OTSON team is also available to assist customers in determining the appropriate resistivity/conductivity for their specific coating needs.

It’s important to note that OTSON electrostatic spray systems are designed with flexibility in mind, and can be easily adjusted to accommodate a wide range of paint and coating types. The OTSON team is always available to assist customers in determining the appropriate equipment and adjustments for their specific coating needs, which includes the resistivity/conductivity of their paint.

Q19.Do you have electrostatic equipment for water-based paints? When you talk about waterborne is the same as water-based paints? If so, is it the same equipment ?

Ans.

Yes, OTSON has electrostatic equipment that is compatible with water-based paints. Waterborne paints and water-based paints are often used interchangeably, and refer to paints that have water as the main solvent or carrier instead of volatile organic compounds (VOCs) such as mineral spirits or acetone. Waterborne paints are highly conductive, which makes them ideal for electrostatic applications. However, when spraying waterborne paint electrostatically, it’s important to isolate the paint-supply system from contact with people, as the charge will be carried back to the fluid-supply system. Special hardware is required, such as an isolation stand and cage or voltage-blocking system. OTSON offers a variety of isolation devices, depending on the application and the system being used. It’s also worth noting that OTSON electrostatic spray system has a wide range of resistivity/conductivity, which allows it to work with both water-based and solvent-based paints.

Q20 .Which is the method that you suggest to ground the equipment? And the sprayer (operator) ? How is it done ?

Ans.

Proper grounding is essential for safe and efficient electrostatic spraying. To ground the equipment, the OTSON Electrostatic Spray System is connected to a ground wire or rod, which is driven into the earth. This allows any excess charge to be safely dissipated into the ground, preventing potential hazards such as static sparks.

As for the sprayer (operator), it is important that they are also properly grounded. This can be achieved by having the sprayer wear a grounded wrist strap, which is connected to the ground wire or rod. This ensures that any excess charge on the operator’s body is also safely dissipated into the ground. It’s also important to make sure that the operator is wearing appropriate personal protective equipment, such as an electrostatic dissipative smock or apron, to ensure that they are fully protected from any potential hazards.

In addition, the spray booth or area should be grounded as well. This can be done by connecting the booth or area to the ground wire or rod, or by using a conductive floor or mat. This ensures that any excess charge in the spray booth or area is safely dissipated, preventing potential hazards such as static sparks.

It’s also recommended to regularly check the grounding system and make sure that it is properly functioning. This can be done by using a voltmeter or other testing equipment to measure the resistance between the ground wire or rod and the equipment, the operator and the booth or area.

Overall, proper grounding is an essential aspect of electrostatic spraying, and it is important to follow the manufacturer’s instructions and guidelines to ensure that all equipment, operators, and the booth or area are properly grounded.

Q21. How to use OTSON electrostatic spray system for wooden material such like chair, bed frame and table ?

Ans.

Painting wooden products with OTSON electrostatic spray system requires proper surface preparation and the use of appropriate coatings. The following steps should be taken:

Clean the wooden surface to remove any dirt, dust, or debris. Use a degreaser or detergent to remove any grease or oil.
Sand the surface to remove any rough spots or imperfections. Start with a coarse grit sandpaper and progress to a finer grit.
Apply a coat of primer to the surface, if necessary. This will help the paint or coating adhere to the wood.
Apply the paint or coating using the OTSON electrostatic spray system. The paint or coating should be adjusted to the appropriate viscosity and conductivity to ensure optimal atomization and transfer efficiency.
Allow the paint or coating to dry completely. The drying time will depend on the type of paint or coating used and the temperature and humidity conditions.
Apply additional coats of paint or coating as needed.
If a high-quality finish is desired, consider using a curing oven to speed up the drying process.

It’s important to note that wooden products may require additional surface preparation steps, such as filling in cracks or gaps with wood filler, depending on the condition of the wood and the desired finish. The OTSON team is available to assist customers in determining the appropriate surface preparation and coating selection for their specific wooden products.

Ans.

In fact, when they use electrostatic spray painting, the moisture of wood must be maintained
at around 12 % ~15 %, also it can not be lower than 8%. The moisture of wood and our equipment
are a major key. This is one of our best advantages. We have many customers who are using our
OTS-3000 coating their wooden furniture worldwide.

Q22. How to coating and paint plastic products ?

Ans.

Using OTSON electrostatic spray system for plastic products is similar to using it for wooden products. The main difference is that plastic surfaces may require a different type of surface preparation and possibly a different type of paint or coating. Before painting, the plastic surface should be cleaned thoroughly to remove any dirt, dust, or other contaminants. If the plastic surface has any imperfections or scratches, they should be repaired or sanded smooth. A plastic primer or adhesion promoter may also be required to ensure proper adhesion of the paint or coating.

When it comes to the spraying process, the plastic surface should be grounded and the electrostatic gun should be set to the appropriate voltage and distance from the surface to ensure proper atomization and charge of the paint or coating. The plastic material should also be heated to the appropriate temperature to ensure proper curing of the paint or coating.

It’s also important to note that some plastic materials may not be suitable for electrostatic spraying, so it’s always recommended to consult the manufacturer’s instructions for the specific paint or coating being used to determine the appropriate surface preparation and spraying requirements. OTSON team is always available to assist customers in determining the appropriate method for their specific application.

Q23. Do we need some special requested paints tank to connect to diaphragm pump, what you suggest for paint tank for setting up complete system ?

Ans.

For using OTSON electrostatic spray system, the paint tank should be able to provide a consistent and stable flow of paint to the spray gun. It is recommended to use a paint tank that is specifically designed for electrostatic spraying, as these tanks have features such as agitation systems to keep the paint in a homogenous state and prevent settling. A diaphragm pump can be used to transfer the paint from the tank to the spray gun, and it is important to ensure that the pump is compatible with the type of paint being used (waterborne or solvent-based).

When it comes to plastic products, it is important to use a paint that is specifically formulated for plastic surfaces. These paints typically have a high molecular weight and are formulated with special resins and plasticizers that allow them to adhere well to plastic surfaces. The paint tank should be able to provide a consistent and stable flow of paint to the spray gun. it is recommended to use a paint tank that is specifically designed for electrostatic spraying, as these tanks have features such as agitation systems to keep the paint in a homogenous state and prevent settling.

In addition, it is also important to consider the size of the paint tank in relation to the size of the project and the flow rate of the spray gun. A larger paint tank may be necessary for larger projects or for applications where the spray gun is being used at a high flow rate.

In conclusion, when it comes to paint tank for setting up complete OTSON electrostatic spray system, it is important to use a tank that is specifically designed for electrostatic spraying and which is compatible with the type of paint being used. It is also important to consider the size of the paint tank in relation to the size of the project and the flow rate of the spray gun, and to ensure that the paint is agitated correctly to prevent settling.

Q24 Affect factors the performance of an electrostatic atomizer spray system

There are several factors that can affect the performance of an electrostatic atomizer spray system, including:

Electrode design: The design of the electrode can affect the shape and size of the spray pattern, as well as the distribution of the paint on the surface.
Air pressure: The air pressure used to atomize the paint can affect the size and shape of the spray pattern, as well as the distribution of the paint on the surface.
Paint viscosity: The viscosity of the paint can affect the atomization of the paint, as well as the distribution of the paint on the surface.
Electrostatic voltage: The electrostatic voltage can affect the amount of paint that is attracted to the surface and the distribution of the paint on the surface.
Grounding: Proper grounding is crucial for the performance of an electrostatic atomizer spray system, as it ensures that the paint is attracted to the surface and not to the equipment or operator.
Surface condition: The condition of the surface can affect the adhesion of the paint, as well as the distribution of the paint on the surface.
Temperature: The temperature can affect the curing of the paint, as well as the distribution of the paint on the surface.
Paint properties: The conductivity, viscosity, and surface tension of the paint can all have a significant impact on the performance of the spray system. Conductive paints, for example, will require less voltage to achieve a given charge than non-conductive paints. High viscosity paints may require additional shear to achieve the desired atomization, while low surface tension paints may produce smaller droplets and a finer finish.
Atomizer design: The design of the atomizer, including the shape and size of the bell or disk, can affect the size and distribution of the paint droplets. Different atomizer designs may be better suited for different types of paints or applications.
Power supply: The voltage and current output of the power supply can affect the performance of the spray system. A higher voltage or current output will typically result in a higher transfer efficiency. However, it’s important to ensure that the voltage and current output are not so high as to cause arcing or other problems.
Spray distance: The distance between the spray gun and the substrate can affect the performance of the spray system. A closer spray distance will typically result in a higher transfer efficiency, but may also result in overspray or other problems.
Grounding: Proper grounding of the substrate, equipment, and operator is essential for the performance of an electrostatic spray system. Improper grounding can cause arcing and other problems, resulting in reduced transfer efficiency or even equipment damage.
Air pressure and flow : Air pressure and flow can affect the performance of the spray system. A higher air pressure can result in a more aggressive atomization, but may also result in overspray or other problems.
Operator skill: The skill and experience of the operator can also have a significant impact on the performance of the spray system. An experienced operator will be able to adjust the system to achieve the desired finish and minimize overspray.
Humidity: The humidity can affect the curing of the paint, as well as the distribution of the paint on the surface.

By understanding and controlling these factors, it is possible to optimize the performance of an electrostatic atomizer spray system and achieve a high-quality finish on the painted surface.

OTSON team will be happy to help you to optimize your system to achieve the best performance for your application and to help you troubleshoot any issues that you may encounter.

Q25 The safety of OTSON Electrostatic Spray equipment?

Electrostatic spray equipment has built-in safety features to help prevent accidents and injuries. Some of these safety features include:

Grounding: Electrostatic spray equipment uses an electrical charge to attract the coating material to the surface being coated. To ensure the electrical charge is safely conducted, the object being coated (such as a car or truck) is grounded, completing the electrical circuit.

Overload protection: Electrostatic spray equipment typically includes overload protection to prevent damage to the equipment and to help ensure the safety of the operator. This protection may include fuses, circuit breakers, or other safety devices.
Safety guards: Many electrostatic spray guns include safety guards to protect the operator from the high-voltage electrical discharge. These guards may be made of insulating materials such as plastic or rubber, and are typically designed to prevent the operator from coming into contact with the electrical discharge.

Emergency stop button: Electrostatic spray equipment often includes an emergency stop button that can be used to quickly shut off the power supply in the event of an emergency.

Safety training: It is important for operators of electrostatic spray equipment to receive proper training on the use and safety of the equipment. This may include training on how to set up and use the equipment safely, how to properly ground the object being coated, and how to respond to emergencies.

Overall, the safety design of electrostatic spray equipment is an important factor to consider when using this technology, and it is important to follow all safety protocols and guidelines to ensure the safe and effective use of the equipment.

In addition to the safety features mentioned above, OTSON electrostatic spray equipment also includes additional safety measures such as voltage blocking systems, isolation stands and cages, and automatic shut-off systems to ensure the safe operation of the equipment. It is also important to ensure that the equipment is properly maintained and regularly inspected to ensure it is in safe working condition. It is also highly recommended to have regular safety training for operators and technicians to ensure they are familiar with the equipment, its functions, and how to properly handle and maintain it in a safe manner.

Q26 .Does OTSON Electrostatic Spray system can hanle 2k or 3k painting system ?

Yes, OTSON Electrostatic Spray systems are designed to work with 2k and 3k painting systems. Our systems come equipped with high-performance mixers and gear pumps that are specifically designed to handle the viscosity and flow requirements of 2k and 3k paints. Our mixer system is designed to ensure a perfect mixing of the 2k or 3k paint, and our gear pump is designed to handle the high viscosity of these paints and provide a consistent and stable flow rate. Additionally, our systems are equipped with advanced controls and monitoring systems that allow for easy and precise adjustments to the paint flow and pressure to ensure optimal performance and efficiency. With OTSON Electrostatic Spray systems, you can be sure that you are getting the best results when it comes to 2k and 3k painting.

Q27 The Total Solutions of Electrostatic Spray Defects

The impedance of the paint can indeed be an important factor in electrostatic spray coating. High impedance can cause the paint to resist the electrostatic charge, leading to uneven coverage or other defects. Here is an updated table that includes the impedance factor:

Defect	Possible Cause	Solution	Adjust Electrostatic Spray Equipment Factors
Uneven coverage	Poor grounding, inadequate electrostatic charge, high impedance paint	Improve grounding, increase electrostatic power, use low impedance paint	Increase electrostatic power, check and improve grounding, use low impedance paint
Orange peel	Improper paint viscosity, air pressure, or impedance	Adjust paint viscosity, air pressure, or use low impedance paint	Adjust air pressure, paint flow, spray distance, spray type, paint viscosity, or use low impedance paint
Sagging or dripping	Excessive paint flow or improper spray technique	Adjust paint flow or spray technique	Adjust paint flow, spray distance, and spray angle
Fish eyes	Contamination on the surface or paint system, high impedance paint	Clean and prepare surface, use proper paint system, use low impedance paint	Check for contamination, use proper paint system, ensure proper paint curing conditions, use low impedance paint
Cracking	Improper paint curing conditions or substrate quality	Ensure proper paint curing conditions	Adjust paint curing conditions or improve substrate quality
Blushing	High humidity or low temperature, high impedance paint	Control humidity and temperature, use low impedance paint	Control spray booth temperature and humidity, use low impedance paint
Peeling	Inadequate surface preparation or improper adhesion, high impedance paint	Proper surface preparation and adhesion, use low impedance paint	Ensure proper surface preparation, check and adjust adhesion, and curing conditions, use low impedance paint
Rough texture	Excessive paint build-up or improper paint viscosity, high impedance paint	Adjust paint build-up or viscosity, use low impedance paint	Adjust paint flow, spray distance, paint viscosity, or use low impedance paint

I hope this updated table is helpful to you.

I can provide a brief description of some common electrostatic spray coating defects:

Orange peel: A textured surface defect that resembles the skin of an orange. It is caused by uneven application of the coating material, typically due to incorrect spray technique or improper atomization.
Sagging: Occurs when the coating material drips or sags down the surface being coated. This defect is typically caused by excessive film build, incorrect spray technique, or improper viscosity of the coating material.
Pinholing: Small, visible holes in the coating film. This defect is typically caused by contaminants on the surface being coated, or by contamination in the coating material.
Fish eyes: Small circular craters in the coating film. This defect is typically caused by contamination on the surface being coated, or by incompatible coating material.
Cobwebbing: Occurs when the electrostatic charge causes the coating material to “string” between the parts being coated, resulting in a spiderweb-like appearance. This defect is typically caused by incorrect electrostatic power settings or improper grounding.

Again, it’s important to properly diagnose the cause of any coating defects before attempting to fix them. A visual inspection of the defect can provide some clues, but it’s best to have a thorough understanding of the coating process and the factors that can impact coating quality.

Defect	Possible Causes	Adjustments
Orange Peel	Incorrect spray technique	Adjust spray angle, air pressure, paint flow, and distance from surface. Use proper spray pattern and technique.
Sagging	Excessive film build, incorrect spray technique	Adjust air pressure, paint flow, and spray distance. Use proper spray pattern and technique.
Pinholing	Contaminants on surface, contamination in paint	Clean surface before coating. Use clean, uncontaminated paint.
Fish Eyes	Surface contamination, incompatible paint	Clean surface before coating. Use compatible paint.
Cobwebbing	Incorrect electrostatic power settings, improper grounding	Adjust electrostatic power, grounding, and distance from surface. Use proper spray type and technique.
Over-Spray	High paint flow, incorrect spray technique	Adjust paint flow, air pressure, and spray distance. Use proper spray pattern and technique.
Under-Spray	Low paint flow, incorrect spray technique	Adjust paint flow, air pressure, and spray distance. Use proper spray pattern and technique.
Mottling	Inconsistent paint flow, incorrect spray technique	Adjust paint flow, air pressure, and spray distance. Use proper spray pattern and technique.
Blushing	High humidity, incorrect spray technique	Adjust air pressure, spray distance, and temperature in spray booth. Use proper spray pattern and technique.
Wrinkling	Excessive film thickness, incorrect spray technique	Adjust paint flow, air pressure, and spray distance. Use proper spray pattern and technique.
Cratering	Surface contamination, incompatible paint	Clean surface before coating. Use compatible paint.
Fisheye Cratering	Surface contamination, incompatible paint, improper gun setup	Clean surface before coating. Use compatible paint. Check gun setup and settings.
Haloing	Improper gun setup, excessive electrostatic charge	Check gun setup and settings. Reduce electrostatic charge.
Erosion	High electrostatic power, improper gun setup	Reduce electrostatic power. Check gun setup and settings.

Did not Find the Answer?

Please ask our technical team.

Contact us

We look forward to working with you to enhance the performance of your paint shop and help you achieve your goals. Contact us today to learn more about our products and services and also the latest addition iOTSON Paint Shop Technologies.

Professional Electrostatic Spray Equipments and Smart Paint Shop

OTS-5000-Auto-Electrostatic-Spray-Disk-System

OTS-7800 Electrostatic Spray Gun System- Robot Arm

OTS-7900 Electrostatic Spray Bell system- Robot Arm

OTS-9000_auto_electrostatic_spary_bell_system