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Plastic Sheet and Blown Film Extrusion
Flat plastic comes from an extruder in two ways. Sheet too thick to blow is pushed through a wide slit die and pulled through chill rolls, which cool it and set its thickness and surface. Thin film is blown: a tube is extruded upwards from a ring die, inflated by air into a tall bubble that stretches it both ways, cooled, flattened by nip rolls into lay-flat tube, and wound or slit. Bags are cut and heat-sealed from the lay-flat tube; wrap is slit film.
高级
Continuous (industrial)
说明
1
1
Melt
Melt
Pellets are melted along the extruder's heated screw.
此步骤所需材料：
聚丙烯颗粒100 公斤
PVC复合颗粒100 公斤
LDPE颗粒100 公斤
HDPE颗粒100 公斤所需工具：
塑料挤出机
颗粒进料斗2
2
Sheet: slit die and chill rolls
Sheet: slit die and chill rolls
For sheet, the melt leaves a wide slit die and passes between chill rolls that cool it and set its thickness.
所需工具：
塑料挤出机
挤压模3
3
Film: blow a bubble
Film: blow a bubble
For film, a tube is extruded upward from a ring die and inflated with air into a bubble, stretching it thin both across and along; an air ring cools it.
所需工具：
塑料挤出机挤压模4
4
Flatten and wind
Flatten and wind
Nip rolls flatten the bubble into lay-flat tube, which is wound up or slit into sheeting.
5
5
Bags
Bags
Lay-flat tube is cut to length and heat-sealed across the bottom to make bags and liners.
6
6
Check
Check
Thickness is measured across the width.
所需工具：
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