Method for producing two-way stretching polypropylene film for cigarette by pipe soaking method
A biaxially stretched polypropylene technology, applied in the field of biaxially stretched polypropylene cigarette film production, can solve the problems of poor product thickness uniformity, small stretching ratio, and low production speed, and achieve good packaging effects and small equipment investment , the effect of small footprint
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[0022] Example 1
[0023] The raw material in this example is that the surface layer A is copolymerized polypropylene, which accounts for 90% of the content, and the anti-sticking masterbatch, which accounts for 10%; the content of homopolypropylene in the core layer is 55%, which increases stiffness. The percentage content of the master batch is 35%, and the percentage content of the slip / antistatic agent master batch is 5% respectively; the material and content of the surface layer C are the same as the surface layer A.
[0024] The polypropylene raw material and the master batch are accurately weighed according to the proportion and put into the mixing tank for mixing for 15 minutes, and then sent to the storage tank, respectively sent to the extruder through the pipeline, and extruded into the initial tube film by the three-layer co-extrusion die. The extruders are: A layer is a φ50 extruder with a screw length-to-diameter ratio of 30:1; B layer is a φ100 extruder with a screw...
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