Three-layer co-extruded rapid bidirectionally stretched wide polyethylene composite film and preparation method thereof

A biaxial stretching and three-layer co-extrusion technology, which is applied in the field of three-layer co-extrusion rapid biaxial stretching wide-width polyethylene composite film and its preparation, can solve problems such as melt fracture, slow production speed, and large film thickness tolerance , to achieve the effects of not easy to break, reduce resin crystallization ability, and accurately control

Active Publication Date: 2016-12-07
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned polyethylene composite films all adopt the blow molding process, and the main disadvantages are: ① due to the slow cooling rate, the transparency of the film is poor; ② the production speed is slow; ③ the thickness tolerance of the film is relatively large
Linear low-density polyethylene (LLDPE) is prone to melt fracture, and its film is prone to fish skin patterns, which further increases the difficulty of production and processing

Method used

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  • Three-layer co-extruded rapid bidirectionally stretched wide polyethylene composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The mass percentages of selected raw materials are as follows:

[0027] The raw materials of the surface layer and the heat-sealing layer include the following components in mass percentage: 50% of low-density polyethylene (LDPE), 40% of metallocene polyethylene (m-LLDPE), 9% of ultra-high molecular weight polyethylene, and 0.5% slip agent, 0.5% antistatic agent. The raw material of the barrier layer is ethylene / vinyl alcohol copolymer (EVOH) resin.

[0028] According to the raw material formulations of the surface layer, barrier layer, and heat-sealing layer, the masterbatch is pretreated by batching, mixing, and drying. Each layer of resin material is heated in the extruder barrel and under the shear and push of the screw, melts, plasticizes, and heats to 190°C. After passing through the filter, the impurities are filtered out, and extruded into a thin film by the co-extrusion compound die. Thin flakes of fluid flow out. Under the action of the air knife in the cas...

Embodiment 2

[0030] The mass percentages of selected raw materials are as follows:

[0031]The raw materials of the surface layer and the heat-sealing layer include the following components in mass percentage: 55% of low-density polyethylene (LDPE), 37% of metallocene polyethylene (m-LLDPE), 6% of ultra-high molecular weight polyethylene, and 1.0% slip agent, 1.0% antistatic agent. The raw material of the barrier layer is ethylene / vinyl alcohol copolymer (EVOH) resin.

[0032] According to the raw material formulations of the surface layer, barrier layer, and heat-sealing layer, the masterbatch is pretreated by batching, mixing, and drying. Each layer of resin material is heated in the extruder barrel and under the shear and push of the screw, melts, plasticizes, and heats to 185°C. After passing through the filter, the impurities are filtered out, and extruded into a thin film by the co-extrusion compound die. Thin flakes of fluid flow out. Under the action of the air knife in the cast...

Embodiment 3

[0034] The mass percentages of selected raw materials are as follows:

[0035] The raw materials of the surface layer and the heat-sealing layer include the following components in mass percentage: 60% of low-density polyethylene (LDPE), 30% of metallocene polyethylene (m-LLDPE), 7% of ultra-high molecular weight polyethylene, and 1.5% slip agent, 1.5% antistatic agent. The raw material of the barrier layer is ethylene / vinyl alcohol copolymer (EVOH) resin.

[0036] According to the raw material formulations of the surface layer, barrier layer, and heat-sealing layer, the masterbatch is pretreated by batching, mixing, and drying. Each layer of resin material is heated in the extruder barrel and under the shear and push of the screw, melts, plasticizes, and heats to 180°C. After passing through the filter, the impurities are filtered out, and extruded into a thin film by the co-extrusion compound die. Thin flakes of fluid flow out. Under the action of the air knife in the cas...

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Abstract

The invention discloses a three-layer co-extruded rapid bidirectionally stretched wide polyethylene composite film and a preparation method thereof and relates to a polyethylene film and a packaging material. The film comprises three polyethylene film layers orderly comprising a surface layer, a barrier layer and a heat-sealing layer from outside to inside. The surface layer and the heat-sealing layer are prepared from low density polyethylene, metallocene polyethylene, ultrahigh molecular weight polyethylene, a slipping agent and an antistatic agent. The barrier layer is prepared from ethene / vinyl alcohol copolymer resin. The preparation method comprises mother material pretreatment, fusion, plastification and heating of all layers of resin raw materials, filtration for impurity removal, extrusion and flake fluid discharge, cooling to form a glassy casting sheet with uniform thickness on the surface of a cooling roller when the flake fluid flows through the surface of the cooling roller, vertical stretching processes of preheating, drawing and heat treatment setting in a vertical stretching unit, film transverse stretching processes of preheating, drawing, heat treatment setting and cooling in a transverse stretching machine, film traction and rolling for formation of a large coil of a film, and film cutting for finished product formation.

Description

technical field [0001] The invention relates to a polyethylene film and a packaging material, in particular to a three-layer co-extruded rapid biaxially stretched wide-width polyethylene composite film and a preparation method thereof. Background technique [0002] Film packaging materials have the characteristics of high tensile strength, light weight, non-toxic and tasteless, and prevent product leakage or damage. They can well replace traditional paper and aluminum foil packaging. In recent years, with the rapid development of plastic film products and production processes, film packaging materials have been widely used in many fields such as food packaging, industrial product packaging, household daily necessities packaging, clothing packaging, and pharmaceutical packaging. Low-density polyethylene (LDPE) film is a translucent, glossy, soft film with excellent chemical stability, heat sealability, water resistance and moisture resistance, and has broad applications in in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B27/30B32B27/08B32B27/16B32B33/00B32B37/15B32B37/08B32B38/00B65D65/40B29C47/06C08L23/06C08L23/08
CPCB29C48/0018B29C48/08B29C48/21B32B27/08B32B27/16B32B27/306B32B27/32B32B27/327B32B33/00B32B37/08B32B37/15B32B38/0012B32B38/0036B32B2038/0028B32B2307/50B65D65/40C08L23/06C08L2205/025C08L2205/03C08L2207/066C08L2207/068C08L2314/06C08L23/08
Inventor 戴李宗曾碧榕罗宇峰陈国荣王荣贵朱继红张秀华罗伟昂许一婷
Owner XIAMEN UNIV
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