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Processes
Electrostatic powder coating is the process by which powders are electrostatically charged by a direct current high voltage supplied by a high voltage electrostatic generator. The powder application adheres onto the object to be coated by grounding the article to be coated by an electrostatic attraction force. A continuous coating film is made by heating, kneading, and curing the coating adhered onto the article to be coated. The powder coating over-spray can later be recovered for recycling. Precision Coating Technology & Manufacturing Inc. utilizes the following processes for the applicaton of various materials:
CORONA ELECTROSTATIC SPRAY:
With this method of application the powder coating material is applied with a spray gun by air from a coating feeder. The powder coating is given a negative charge by a high voltage electrostatic generator. The object to be coated is grounded, and the powder coating ejected from the tip of the spray gun adheres onto the objects surface by electrostatic attraction. This type of application is used for coating large, flat surfaces and is generally a mechanized process.
TRIBO ELECTROSTATIC SPRAY:
This method of application is appliec with a frictional, less intensive charge (no high voltage electrostatic generator). The powder coating material is also applied with a spray gun by air from a coating feeder. This type of application is well suited for three-dimensional items where there is a need to coat deep recesses. This type of application is typically done by hand.
Advantages:
- Film thicknesses from 1 mil to 10 mils
- More durable, longer lasting than paint
- Chip/scratch resistant
- Many decorative colors to choose from
- Good outdoor weatherability
- Impact resistant
Materials used:
*Photos to use: Conveyor Line
FLUID BED DIP:
Finely divided powder coatings are mixed into a fluid-like state by passing air through a porous plate bottom of a powder coatings hopper. This creates a fluidized bed of powder particles or "dip tank" where the electrostatic adhesion takes place by melting the coating material onto the object. This method of application produces a thicker, heavier coating that is often used to cover surface blemishes as well as wear resistant coatings that add coloration.
Advantages:
- Intermediate film thickness of .010 to .030 inch
- Excellent corrosion and wear resistance
- Excellent sofvant resistance
- Good electrical resistance
Materials used:
In addition to the above electrostatic application processes, Precision Coating Technology & Manufacturing Inc. also offers the following direct application coatings:
LIQUID DIP:
Vinyl Plastisol (PVC) dipping is a process by which the object to be coated is directly dipped into the coating material. Plastisol provides a soft, color matched, textured or smooth finish over aluminum, steel and certain plastics. Plastisol can cover up minor manufacturing defects, reduce noise, and offers a high insulation value. Plastisol powder coating is also corrosion, impact, and abrasion resistant.
Advantages:
- Heavy film thickness from 1/16 to 1/4 inch
- Excellent corrosion resistance
- Excellent abrasion resistance
- Good insulating properties
- Soft/resilient to the touch
- Good for tool handles and clamping devices
Materials used:
*Photos to use: Reading Body Rollers
LIQUID SPRAY:
Liquid Fluorocarbon Coating and the many hybrid application materials are applied with a spray gun and cured in high temperature line vats. Fluorocarbon Coating is not affected by the fluids in the body and as a result is used in a wide array of medical instrumentation and high-tech tools that require exceptional temperature, chemical, friction and corrosion resistance.
Materials used: Fluorocarbon Coating
*Photos to use: New Spray Booth
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