Extrusion & Post
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LDPE Film Gel (Fisheye)
Problem Phenomenon
Transparent or white small gel spots and fisheyes appear on the film surface, breaking ink during printing and lamination.
Cause Analysis
Unplasticized particles, cross-linked degradation matter or impurities are mixed in; the film thickness is only 10~50μm, so any melt inhomogeneity will show.
Solution
①Improve plasticization uniformity (barrier screw + mixing section); ②densify the filter screen; ③clean die head dead spots; ④control regrind quality and ratio.
Key Takeaway
Film is a magnifying glass of melt uniformity; plasticization must be overdone.
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