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Food packaging plastic substrate film and production technology thereof

A plastic base material and food packaging technology, applied in the field of plastic chemical industry, can solve the problems that plastic films cannot meet special packaging requirements, and achieve the effects of improved appearance, good heat sealing performance, and good pollution resistance

Inactive Publication Date: 2012-04-18
DALIAN RUIXIANDA PLASTIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, simply mixing one or several kinds of polyethylene raw materials and then blowing the plastic film cannot meet the needs of special packaging, and it also needs to be based on the density, melt index, Vicat softening point temperature, and bidirectional packaging of various polyethylene raw materials. Qualitative and quantitative analysis of tensile rate and tensile strength, systematic and meticulous proportioning according to design requirements, supplemented with necessary processing aids, and finally make the blown plastic film within a certain range to meet the requirements of special packaging Require

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The raw materials are LDPE20% for the inner layer, LLDPE60% for linear low density polyethylene, and mLLDPE20% for metallocene linear polyethylene; the middle layer is LDPE30% for low density polyethylene, and LLDPE70% for linear low density polyethylene; The outer layer is prepared according to the proportion of low-density polyethylene LDPE100% production raw materials; mixing for 15 minutes, setting the melting temperature at 185°C-195°C, the speed of the main roller rod at 120r / min, the temperature of the film head at 175°C-205°C, shaping, traction cutting. The properties of the produced polyethylene plastic film are as follows: the tensile strength is 22.18Mpa, the elongation at break is 567.4%, the heat seal strength is 9.9, and the friction coefficient is 0.198.

Embodiment 2

[0027] The raw material is 15% low-density polyethylene LDPE, 60% linear low-density polyethylene LLDPE, and 25% metallocene linear polyethylene mLLDPE; the middle layer is 30% low-density polyethylene LDPE, and 70% linear low-density polyethylene LLDPE; The outer layer is prepared according to the proportion of low-density polyethylene LDPE100% production raw materials; mixing for 18 minutes, setting the melting temperature at 185°C-195°C, the speed of the main roller rod at 120r / min, the temperature of the film head at 175°C-205°C, shaping, traction cutting. The properties of the produced polyethylene plastic film are as follows: the tensile strength is 22.18Mpa, the elongation at break is 567.4%, the heat seal strength is 9.9, and the friction coefficient is 0.198.

Embodiment 3

[0029] The raw material is 25% low-density polyethylene LDPE, 60% linear low-density polyethylene LLDPE, and 15% metallocene linear polyethylene mLLDPE; the middle layer is 30% low-density polyethylene LDPE, and 70% linear low-density polyethylene LLDPE; The outer layer is prepared according to the ratio of 100% low-density polyethylene LDPE to produce raw materials; mixing for 20 minutes, setting the melting temperature at 185°C-195°C, the speed of the main roller rod at 100r / min, the temperature of the film head at 175°C-205°C, shaping and pulling cutting. The properties of the produced polyethylene plastic film are as follows: the tensile strength is 22.18Mpa, the elongation at break is 567.4%, the heat seal strength is 9.9, and the friction coefficient is 0.198.

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Abstract

The invention relates to a food packaging plastic substrate film which is of a three-layer structure: an inner layer, an interlayer and an outer layer, wherein the inner layer is made of low-density polyethylene LDPE, linear low-density polyethylene LLDPE and metallocene linear low-density polyethylene mLLDPE; the interlayer is made of low-density polyethylene LDPE and linear low-density polyethylene LLDPE; and the outer layer is made of metallocene linear low-density polyethylene mLLDPE. A production technology of the food packaging plastic substrate film comprises the following steps: extruding the mixed fed materials; blowing a film; forming; dragging and cutting, and the like. The food packaging plastic substrate film provided by the invention has the advantages of high separating property, high air tightness, excellent pollution resistance, excellent heat-seal property, high pressure resistance, excellent shock resistance, and achieves food safety certificate.

Description

technical field [0001] The invention belongs to the plastic chemical industry, in particular to a food packaging plastic substrate film and a production process thereof. Background technique [0002] At present, plastic substrate films for food packaging are usually produced by blow molding with polyethylene raw materials. However, in order to meet the above performance requirements, it is not possible for a single polyethylene blown film process, so polyethylene raw materials with various properties have been developed. However, the single-layer polyethylene film has poor barrier properties to oxygen and other gases. When packaging sauces, it is easy to cause pollution at the seal. The general liquid packaging polyethylene film has poor sealing performance for this type of packaging, which cannot meet its packaging process and requirements. Therefore, it is necessary to use multi-layer polyethylene modified film or composite film with good barrier performance and inclusio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B29C55/28B65D65/40
Inventor 梁继鹏
Owner DALIAN RUIXIANDA PLASTIC CO LTD
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