Thermoforming
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Poor Electroplating/Spray Coating Adhesion of Biaxially Oriented Polypropylene Film Products
Problem Phenomenon
After electroplating or spray coating, the coating adhesion of the product is poor, and it is prone to blistering or peeling.
Cause Analysis
(1) The surface tension of the product is insufficient, and the coating is difficult to adhere
(2) There are release agent or oil residues on the product surface
(3) The internal stress of the product is large, affecting the coating adhesion
(4) The pretreatment before electroplating/spraying is insufficient
(5) The coating material does not match the base material
Solution
(1) Perform corona or flame treatment on the product surface
(2) Ensure the product surface is clean and free of release agent
(3) Reduce the internal stress of the product (annealing treatment)
(4) Strengthen the pretreatment (degreasing, roughening, etc.)
(5) Select a matching coating material
Key Takeaway
The electroplating and spraying adhesion is determined by the surface energy and surface condition.
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