Extrusion & Post
7 visualizações
LDPE Film Gel (Fisheye)
Fenómeno do problema
Transparent or white small gel spots and fisheyes appear on the film surface, breaking ink during printing and lamination.
Análise das causas
Unplasticized particles, cross-linked degradation matter or impurities are mixed in; the film thickness is only 10~50μm, so any melt inhomogeneity will show.
Solução
①Improve plasticization uniformity (barrier screw + mixing section); ②densify the filter screen; ③clean die head dead spots; ④control regrind quality and ratio.
Conclusão principal
Film is a magnifying glass of melt uniformity; plasticization must be overdone.
Isto foi útil?
0 pessoas acharam isto útil
Obrigado pelo seu comentário!