... certification & ISO 9002. 2. Surface: powder painting. 3. Inner cleaness: up to R134a & CFC requirement. Main products: roll bond evaporator, wire ... Prepare the material, Cleaning, roughing surface, Printing, Riveting, Rolling, Annealing, Blow up, Punching, Folding and shaping, Capillary connecting, Assembly welding, Leakage Test ...