Thermoforming
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Poor electroplating/spraying adhesion of high impact polystyrene products
Problem Phenomenon
Poor coating adhesion after electroplating or spraying of products, prone to blistering or peeling.
Cause Analysis
(1) Insufficient product surface tension, coating difficult to adhere
(2) Mold release agent or oil residue on the product surface
(3) Large product internal stress, affecting coating adhesion
(4) Insufficient pretreatment before electroplating/spraying
(5) Coating material does not match the substrate
Solution
(1) Perform corona or flame treatment on the product surface
(2) Ensure the product surface is clean and free of mold release agent
(3) Reduce product internal stress (annealing treatment)
(4) Strengthen pretreatment (degreasing, roughening, etc.)
(5) Select matching coating materials
Key Takeaway
Electroplating and spraying adhesion is determined by surface energy and surface condition.
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