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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

Inactive Publication Date: 2003-06-25
海南日新酒店管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

This technology has the advantages of small equipment investment, small modulus of materials used, high flexibility, and high product shrinkage, but this technology has low production speed, small stretching ratio, poor product thickness uniformity, and film thickness fluctuations are often within ±10 % or more, so it cannot be used to produce biaxially oriented polypropylene cigarette film at present

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The raw materials in this example are that the surface layer A is copolymerized polypropylene, accounting for 90%, anti-adhesive masterbatch, accounting for 10%; the core layer homopolymer polypropylene content is 55%, stiffening The percentage content of the master batch is 35%, and the percentage content of the smooth / antistatic agent master batch is 5%; the material and content of the surface layer C are the same as those of the surface layer A.

[0024] The polypropylene raw material and masterbatch are accurately weighed according to the proportion, put into the mixing tank and mixed for 15 minutes, then sent to the storage tank, sent to the extruder through the pipeline and extruded into the primary tube film through 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 length-to-diameter ratio of 30:1; C layer is a φ50 extruder with a screw length The d...

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PUM

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Abstract

The production process of polypropylene film includes the following steps: mixing polypropylene resin and functional mother material in certain ratio, co-extruding in extruder to form initial tubular film; fast cooling of the initial tubuler film; preheating at 260-400 deg.c in a stove; transverse blowing to expand for 5.0-8.0 times at 300-510 deg.c in a stove; longitudinal stretching for 6.5-8.0 times at 135-150 deg.c; wind cooling, winding, cutting rewinding and re-cutting. Compared with available plain drawing process, the present invention has the advantages of small covered area, less investment and high heat shrinkage of the product.

Description

technical field [0001] The invention relates to a method for producing a biaxially stretched polypropylene film for cigarettes by a bubble tube method. Background technique [0002] The biaxially oriented polypropylene packaging film used for packaging cigarettes has been produced using the "flat stretch biaxially stretched technology", that is, the film is produced by stretching in both vertical and horizontal directions. This production technology requires a large investment in equipment and occupies an area of wide. [0003] The "bubble tube method" production technology, also known as "tube film method", is used in the production of polyethylene heat shrinkable film. The process includes the following steps: mixing raw materials, passing through an extruder in a circular co-extrusion die Extrude the primary tube film, quench the primary tube film to make it crystallize, preheat in the preheating oven, carry out transverse blowing and longitudinal stretching in the stret...

Claims

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Application Information

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IPC IPC(8): B29C55/28
Inventor 林小松吴正新黎坛吴文
Owner 海南日新酒店管理有限公司
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