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