Preparation method for liquid milk bottling packaging material

Abstract

The invention discloses a preparation method for a liquid milk bottling packaging material. The liquid milk bottling packaging material consists of the following components in parts by weight: 100 parts of high-density polyethylene resin, 10-14 parts of low-density polyethylene resin, 3-5 parts of ethylene-vinyl acetate copolymer resin, 16-18 parts of organic modified calcium carbonate, 4-6 parts of titanium dioxide, 8-10 parts of talcum powder, 2-4 parts of a titanate coupling agent, 3-5 parts of zinc stearate, 2-4 parts of modified magnesium carbonate, 1.5-2.5 parts of liquid paraffin and 1-2 parts of white oil. The preparation method comprises the steps: (1) weighing and mixing the materials; (2) performing granulation through a double-screw extruder, controlling the temperatures of four regions of the extruder to be respectively 147-151 DEG C, 162-166 DEG C, 188-192 DEG C and 172-176 DEG C, controlling the temperature of a melt at 175-185 DEG C, and controlling the pressure of the melt to be below 5.0MPa; (3) forming the bottling packaging material through blowing by a bottle blowing machine.

Description

Technical field [0001] The invention relates to the technical field of packaging materials, in particular to a method for preparing liquid milk bottle packaging materials. Background technique [0002] Although a variety of packaging materials for liquid milk products have appeared on the market, the more common ones are soft packaging boxes and bags. This packaging material is composed of surface paper, middle layer aluminum foil and inner plastic film. As a result, this material has excellent barrier properties, long shelf life of milk, and good fragrance retention. The problems are: the specific area per unit area is too high, the cost is too high, the waste bags cannot be recycled, which is not conducive to environmental protection; the other is through three The advantages of this material are: low cost, recyclable, and environmentally friendly. However, the three-layer film has poor barrier properties, short shelf life, and poor milk flavor retention. Due to the addition o...

AI Technical Summary

Problems solved by technology

[0002] Although various packaging materials for liquid dairy products have appeared on the market, the more common ones are soft packaging boxed and bagged packaging materials, which are made of surface paper, middle layer aluminum foil and inner plastic film. As a result, this material has excellent barrier properties, long shelf life of milk liquid, and good fragrance retention. The existing problems are: the specific area per unit area is large, the cost is too high, and waste bags cannot be recycled, which is not conducive to environmental protection; The plastic film produced by one-layer or five-layer co-extrusion blow molding has the advantages of low cost, recyclability, and environmental protection, but the three-layer film has the disadvantages of poor barrier performance, short shelf life, and poor milk flavor. Due to the addition of a barrier layer in the middle of the layered film, its barrier properties and shelf life have been improved, but it is far inferior to the previous packaging, and because the co-extrusion blown packaging film has a black masterbatch added to the inner resin to protect it from light. In contact with milk, the migration of low-molecular substances in its additives also has a considerable impact on the taste and quality of milk

[0003] Traditional paper packaging has been difficult to meet the requirements of high-quality food packaging due to its environmental protection factors.