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