Application of the General Linear Model

摘要

The environmentally friendly nature of powder coatings over conventional liquid coatings continues to fuel its growth within various coatings segments.1 Although environmentally friendly,powder coatings still have challenges,especially those related to product manufacture.Powder coatings go through a series of process steps that impact the final product.First,the raw materials are dry blended in a pre-mixing stage.Then,the pre-mixed materials are passed through an extruder to incorporate pigments and additives within the binder system.The extrudate is then broken down using a grinding mechanism.This step can be further broken into two steps:large grinding,which reduces product to less than a few centimeters;followed by fine grinding,which brings the powder down to micron size.Ground extrudate is now sieved(scalped)until the desired particle size distribution is achieved.Normally,the final dry powder coating will have a distribution between 20 and 100 microns depending upon the final application and product specification.