Evaluation of Waste Powder Coatings in Home Appliances Industry

摘要

Powder coatings are one type of coatings which has less pollution due the absence of solvent in its construction and therefore has been called as "environmental friendly coating".[1,2] However this type of coating has been considered as an environmental friendly coating but several causes that the most important of them is the lack of proper guiding of coatings and preparation system, have led to produce some waste in powder coatings proeess.[3,4]Therefore, three house hold production companies have been elected as case studies (because of the most application of powder coating in this branch of industry) to research about the above-mentioned waste materials. This research has been done through these stages: evaluation the quantity of powder coating waste- theoretical calculation, evaluation the quantity of powder coating waste-case studies.The results shows some parameters such as dimension and size of the parts, geometrical form of the parts, situation and quality of spray process, dimension and size hung are affecting the quantity of waste in powder coating process.The waste percentage decreases when area increase, the waste percentage decreases with increase the amount of coating for each part, the waste percentage increases with increasing the amount of consumed coatings , in case of small parts with irregular geometry the percentage of waste increase , the waste percentage resulting from the hung decreases when the area of part increases, the lack of the primary maintenance (pm) program for coating system and also insufficient training of operators causes an increment in powder coatings waste.