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Method for producing biaxially oriented multilayer co-extruded polyolefin shrink film by flat film process

A biaxial stretching and multi-layer co-extrusion technology, applied in the field of packaging materials, can solve the problems of high product price, difficult to control the stability of the stretching ratio, and low annual production capacity of a single line, so as to prevent sticking, reduce scratches, and improve the The effect of anti-stick isolation

Active Publication Date: 2012-11-07
江苏恒创包装材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] At present, the domestic production of POF heat shrinkable packaging film is made of PE and PP as the main raw materials, and is produced by co-extrusion blow molding bubble tube method / double bubble tube method At present, dozens of production lines at home and abroad have been put into operation and production. The single-line production capacity is about 1,000 tons per year. The annual production capacity of the single-line is low, and the product price has been maintained at a high level; The air ring inflation ratio and stretching speed are used to control the thermal shrinkage rate in the transverse / vertical direction, and the stability of the stretching ratio is difficult to control, so the shrinkage rate of the product is unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Ingredients

[0028] Upper surface layer and lower surface layer: Weigh 96.5kg of polypropylene terpolymer and 3.5kg of terpolymer polypropylene masterbatch with 5% effective amount of silica, wherein the particle size of silica is 7-9 μm;

[0029] Middle layer: weigh 99 kg of linear low density polyethylene, 0.2 kg of oleic acid amide, 0.2 kg of ethoxylated amine, and 0.6 kg of monoglyceride.

[0030] 2) Thick sheet extruded Melt extrusion temperature is 220-250 degrees.

[0031] 3) cast sheet

[0032] 4) Longitudinal stretch

[0033] The longitudinal stretching is 5.0 times. During the longitudinal stretching process, the preheating temperature is 110-130°C, and the stretching temperature is 90-110°C. The setting temperature is 100~115℃.

[0034] 5) Horizontal stretch

[0035] The transverse stretching is 5.2 times. During the transverse stretching process, the preheating temperature is 140~160°C, and the stretching temperature is 150~160°C.

[0036] 6) Rewin...

Embodiment 2

[0038] 1) Top and bottom layers of ingredients:

[0039] Upper surface layer: weigh 96.5kg (ethylene-propylene-1-butene) terpolymerized polypropylene, and 3.5kg of a masterbatch whose particle size is 7-9μm and the effective amount of silica is 5%.

[0040] Lower surface layer: weigh 97kg (ethylene-propylene-1-butene) ternary copolymerized polypropylene, 3kg of a masterbatch whose particle size is 7-9μm and the effective amount of silica is 5%.

[0041] Middle layer: Weigh 99.3 kg of C6 linear low-density polyethylene (LLDPE C6), 0.15 kg of oleic acid amide, 0.15 kg of ethoxylated amine, and 0.4 kg of monoglyceride.

[0042] 2) Thick sheet extruded Melt extrusion temperature is 220-250 degrees.

[0043] 3) cast sheet

[0044] 4) Longitudinal stretch

[0045] The longitudinal stretching is 5.0 times. During the longitudinal stretching process, the preheating temperature is 110-130°C, and the stretching temperature is 90-110°C. The setting temperature is 100~115℃.

[0046]...

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PUM

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Abstract

The invention relates to a method for producing a biaxially oriented multilayer co-extruded polyolefin shrink film by a flat film process, which comprises the following steps: adding 95-97% of ternary-polymerized polypropylene (PP) and 3-5% of silicon dioxide using PP copolymer as a carrier into two surfaces of the co-extruded polyolefin shrink film, adding C6 linear low-density polyethylene (C6-LLDPE) into a core layer, sufficiently fusing and plastifying in an extruder at 220-250 DEG C, extruding by a hanger-type die, processing a thick piece into a film and then longitudinally / horizontally stretching, and then hauling and coiling. The method provided by the invention has advantages of high annual productivity and stable product shrinkage rate.

Description

technical field [0001] The patent of the invention relates to a method for biaxially stretching a multilayer co-extruded polyolefin heat shrinkable film, which belongs to the technical field of packaging materials. Background technique [0002] Environmentally friendly multi-layer co-extruded polyolefin (POF) heat-shrinkable film is made of linear low-density polyethylene (LLDPE) as the middle layer and copolymerized polypropylene (PP) as the inner and outer layers in special equipment. The middle and outer layers are co-extruded to produce a heat-shrinkable film with high transparency, high shrinkage rate and good heat-sealing performance. It has the advantages and strengths of polyethylene (PE) and polypropylene (PP) at the same time, and its excellent performance is far superior to pure polyethylene (PE) film and polypropylene (PP) film. Promote the use of environmentally friendly heat shrinkable packaging materials that have been approved by the European and American m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/14B29C47/06
Inventor 麦少华郭华山
Owner 江苏恒创包装材料有限公司
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