Extrusion & Post
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LDPE Extrusion Coating Pinholes
Problem Phenomenon
Needle-like small holes appear in the coating, and barrier property fails.
Cause Analysis
Molten film rupture, base film surface contamination or too thin coating; bubble rupture in the melt also leaves pinholes.
Solution
①Increase coating thickness; ②clean the substrate surface; ③stabilize melt temperature to prevent rupture; ④check raw material moisture and volatiles.
Key Takeaway
Pinhole = check three: film rupture + substrate contamination + thin layer.
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