Preparation method for oxygen barrier composite layer grain packing bag

Abstract

The invention relates to a preparation method for an oxygen barrier composite layer grain packing bag. The preparation method is characterized by comprising the following steps of: adopting anti-aging polypropylene materials as a protection layer; adopting a three-layer composite oxygen barrier film consisting of polypropylene/ethylene-vinyl acetate/polyethylene or polypropylene/ partial chloroethylene/ and polyethylene as an oxygen barrier layer; mixing linen with ES fiber according to different proportions; preparing two layers of fiber webs of a film sticking layer and a moisture absorption layer respectively by a nonwoven technology; combining the fiber webs into a whole body through a needling layer; overlapping a non-hydrophilic ES fabric web formed by the nonwoven technology on themoisture absorption layer; preparing a composite water locking layer by needling again, wherein the three layers of materials are the protection layer, the oxygen barrier layer and the composite water locking layer sequentially from top down; preparing a material of a bag body through thermal compound; and preparing the grain packing bag by cutting, suturing, hot pressing and sealing. According to the method, the conventional production equipment can be used, the process is simple, the production cost is low, the mold and toxin are prevented from being bred in grains in the bag by regulating the proportion of the materials of all the layers and in the layers, and various requirements of storage, transportation and mold resistance are met.

Description

technical field [0001] The invention relates to a preparation method of a grain packaging bag, in particular to a preparation method of an oxygen barrier composite layer grain packaging bag. The prepared grain packaging bag has high strength and excellent hygroscopicity and oxygen barrier properties, and is suitable for packaging Store and transport grains that are prone to mold. Background technique [0002] my country's traditional grain packaging bags use natural plants, namely jute, as raw materials. The raw hemp needs to be degummed, treated with compound enzymes, reduced and bleached, and then cleaned, oiled, dehydrated, and dried before it can be made to remove color and impurities. The jute fiber is used, and then the tubular braid is made by weaving method and weaving technology, and finally the tubular bag with a large number of small holes is cut and sewn. The grain packaging bag has the characteristics of high strength and durability. At the same time, because my...

AI Technical Summary

Problems solved by technology

The invention has good sealing performance and mildew resistance, but when it is used for packaging grain, the sealing strength is not high, and it may come off and cause losses; in addition, one of the bag body materials of this kind of packaging bag is aluminum foil, and the cost is relatively high. It is not suitable for mass promotion as a grain packaging bag