Preparation method of stewing film for beverage packing

Abstract

The invention provides a preparation method of a stewing film for beverage packing in the field of liquid beverage packing. The method is mainly characterized in that the traditional formula of raw materials for preparing the stewing film is improved; high-density polyethylene, medium-density polyethylene, linear low-density polyethylene and metallocene low-density polyethylene with certain weight percent are adopted; the raw materials are divided into three layers for targeted use according to certain weight percent, mixed with the present auxiliary materials, extruded by a three-screw extruder, and prepared into the composite-layer stewing film material for beverage packing according to the traditional technological procedures. Compared with the traditional preparation technology, the invention reduces the total thickness of a product, obviously decreases the loss rate of defective and waste products, improves the product quality and performance, and adapts to and meets the performance demands for high temperature resistance, piercing resistance, heat seal and pollution resistance.

Description

technical field [0001] The invention belongs to the packaging field and relates to food packaging materials, in particular to a method for preparing a cooking film for beverage packaging. Background technique [0002] Packaging bags for liquid beverages not only need to be resistant to high temperatures, and must not melt or stick under the conditions of 120-126°C and 0.012Mpa, but also must achieve a certain strength and toughness to ensure puncture resistance and heat sealing performance. [0003] The preparation method of the traditional liquid beverage packaging material, its main raw material adopts high-density polyethylene (HDPE) and low-density linear polyethylene (LLDPE), mixes by the weight ratio of 7: 3, adopts single-screw extruder to blow and form become. Due to the raw materials and processes used in the traditional method, although the high-density polyethylene (HDPE) used has high temperature resistance, and the low-density linear polyethylene (LLDPE) has a ...

AI Technical Summary

Problems solved by technology

Due to the raw materials and processes used in the traditional method, although the high-density polyethylene (HDPE) used has high temperature resistance, and the low-density linear polyethylene (LLDPE) has a certain strengthening and toughening effect, but after the mixed single-screw extrusion, it is inevitable that there are defects and defects. The thickness is different, which leads to poor quality and performance of cooking film, which not only wastes materials, but also affects the performance and quality of packaging bag products. The loss rate of bag leakage and bad bag is high, sometimes as high as 5%.