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Coating powders, and liquid resins for casting potting and encapsulation are a category of coating materials designed to encapsulate the part. The purpose of the coating or encapsulation can be decorative, in the case of different colors, but it can also be functional in that it also provides electrical insulation or mechanical protection. Powders, varnishes, and paints are all encapsulation methods that speak more about the application method than the chemistry type.
Coating powders can be broadly defined into two broad chemistry types: thermoplastics and thermoset plastics. Each type has its pros and cons and can be further subdivided into different chemistry types and then finally defined by the end-application and desired final properties.
Please continue to our Learn More section to learn more about the kinds of coating, paint and varnish types, their application methods and to understand how CAPLINQ can help you to select and order the proper coating powder, paint or varnish that is right for your application.
Coating powders can be broadly divided into thermoplastics which include polyethylene (PE) and PVC and thermoset plastics which include polyester and epoxy coating powders. Both have their pros and cons.
There are two basic application methods: electrostatic and hot dipping. Electrostatic application involves coating the part first and then heating it in place. Hot dipping means heating the part ahead of time and then applying the coating powder.
Coating powders can be applied using an electrostatic gun. In these cases, the powder is positively charged and the part being coated in negatively charged. This allows a thin, uniform coating to be applied to the part.
The advantage of this approach is that the powder can be wiped off and reapplied if the coating is not correct, or if the masking was done incorrectly. Since the coating powder is only attached by a static charge, it can easily be wiped off. Furthermore, the thickness of the coating can be quite uniform and can be increased or decreased based on the charge applied.
Once the part is electrostatically coated, it is moved to an oven, where the coating powder is cured in place, leaving a smooth, uniform coating over the part.
Applying the coating powder using an electrostatic fluidized better is a very practical way to apply a uniform powder coating on motor iron armatures.
Similar to the electrostatic spray application, the part and powder are charged, and the powder is applied by forwarding the parts on a rotating screw over the fluidized bed. The powder adheres to the motor armature by static electricity. As the parts roll past the fluidized bed, a brush is applied to the outside of the motor iron, removing the coating powder from the outside of the motor iron where it is nopt wanted.
Once the coating powder has been removed, the parts are rolled over an induction cure copper element where the motor armatures are exposed to temperatures of up to 240°C for a few seconds to fix and cure the coating powder in place.
CAPLINQ offers a range of coating powders for slot insulation including blue, black and green variants and Class H candidates.
CAPLINQ offers a wealth of Technical Papers, Marketing Brochures, Technical Data Sheets and SDS covering our coating powders, paints and varnishes.
We try to post as much information as we can on our blogs, to help you find more relevant information about how to select, use and apply coating powders, varnishes and paints.
CAPLINQ offers a range of epoxy coating powders for busbar and power distribution insulation.