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A kind of food packaging plastic substrate film and its production process

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: 2015-09-30
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 low-density polyethylene LDPE5%, low-density polyethylene LLDPE45%, metallocene linear polyethylene mLLDPE50%; the middle layer is low-density polyethylene LDPE5%, low-density polyethylene LLDPE45%, metallocene linear polyethylene mLLDPE50 % ratio; outer low-density polyethylene LDPE5%, low-density polyethylene LLDPE45%, metallocene linear polyethylene mLLDPE50% ratio to prepare raw materials; mix for 15 minutes, set the melting temperature to 185 ° C -195 ° C, the main roller The rotating speed of the rod is 120r / min, the temperature of the die head is 175°C-200°C, shaping, pulling and cutting. The properties of the produced polyethylene plastic film are as follows: the tensile strength is 28.58Mpa, the elongation at break is 950.4%, the heat seal strength is 10.2, and the friction coefficient is 0.538.

Embodiment 2

[0027] The raw materials are low-density polyethylene LDPE8%, low-density polyethylene LLDPE47%, metallocene linear polyethylene mLLDPE45%; the middle layer is low-density polyethylene LDPE8%, low-density polyethylene LLDPE47%, metallocene linear polyethylene mLLDPE45 % ratio; outer low-density polyethylene LDPE8%, low-density polyethylene LLDPE47%, metallocene linear polyethylene mLLDPE45% ratio to prepare raw materials for production; mixing for 18min, set melting temperature at 185°C-195°C, the roller of the host The rotating speed of the rod is 120r / min, the temperature of the die head is 175°C-200°C, shaping, pulling and cutting. The properties of the produced polyethylene plastic film are as follows: the tensile strength is 28.58Mpa, the elongation at break is 950.4%, the heat seal strength is 10.2, and the friction coefficient is 0.538.

Embodiment 3

[0029] The raw materials are low-density polyethylene LDPE10%, low-density polyethylene LLDPE40%, metallocene linear polyethylene mLLDPE50%; the middle layer is low-density polyethylene LDPE10%, low-density polyethylene LLDPE40%, metallocene linear polyethylene mLLDPE50 % ratio; outer low-density polyethylene LDPE10%, low-density polyethylene LLDPE40%, metallocene linear polyethylene mLLDPE50% ratio to prepare raw materials for production; mixing for 20 minutes, set the melting temperature to 185 ° C -195 ° C, the main roller The rotating speed of the rod is 120r / min, the temperature of the die head is 175°C-200°C, shaping, pulling and cutting. The properties of the produced polyethylene plastic film are as follows: the tensile strength is 28.58Mpa, the elongation at break is 950.4%, the heat seal strength is 10.2, and the friction coefficient is 0.538.

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Abstract

The invention relates to a food packing plastic substrate film, which comprises an inner layer, a middle layer and an outer layer, wherein the inner layer, the middle layer and the outer layer are manufactured by mixing low-density polyethylene (LDPE) with metallocene linear low-density polyethylene (mLLDPE). A production process of the food packing plastic substrate film comprises mixing, feeding, extruding, film blowing, molding, tracing, cutting and the like. The food packing plastic substrate film designed according to the invention has the advantages of high barrier property, high airtightness, pollution resistance, high heat-sealing strength, high heat-sealing property, certain pressure resistance and impact resistance, and is accordant with the food safety certification.

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] The current food packaging industry requires a large number and variety of packaging substrate films, and it is difficult for films produced from a single raw material to meet the packaging requirements of special foods. Plastic substrate films for food packaging are usually produced by blow molding from 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 ty...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/32C08L23/08C08L23/06B65D65/40B29C47/92B29C48/92
CPCB29C47/92B29C2947/92895B29C2947/9259B29C2947/92885B29C47/0026B29C2947/92704B29C48/10B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 梁继鹏
Owner DALIAN RUIXIANDA PLASTIC CO LTD