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Method for preparing mildew-proof grain packing bag with water locking layer

A packaging bag and grain technology, which is applied in the field of preparation of anti-mold grain packaging bags, can solve the problems of low sealing strength, high cost, loss, etc., and achieve the effect of inhibiting the growth of mold and toxins in grain and avoiding moisture regain

Inactive Publication Date: 2012-04-18
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] To prepare the anti-mildew packaging bag for peanuts, prefabricate the water-locking layer first, then unwind the roll together with the protective layer, oxygen-barrier layer and non-hydrophilic layer, and stack them in the order of protective layer, oxygen-barrier layer, water-locking layer and non-hydrophilic layer , and then thermally compounded, cut, sewn into bags, and heat-sealed to form a peanut mildew-proof packaging bag with a bag length of 1070mm, a bag width of 740mm, and a capacity of 50kg. The specific process parameters are: (1) Preparation of the bag blank: (1) The surface density of the protective layer is 120g / m 2 , The conventional anti-aging polypropylene spun-bonded non-woven fabric with a longitudinal and transverse breaking strength of 1250N / 5cm; 3 / m 2 24hr polypropylene / ethylene-vinyl acetate / polyethylene three-layer composite oxygen-barrier film; (3) its prefabricated water-locking layer: (a) blending and opening: superabsorbent fibers with a ...

Embodiment 2

[0063] To prepare wheat mildew-proof packaging bags, prefabricate the water-locking layer first, then unwind the roll together with the protective layer, oxygen barrier layer and non-hydrophilic layer, and stack them in the order of protective layer, oxygen barrier layer, water-locking layer and non-hydrophilic layer , and then thermally compounded, cut, sewn into bags, and heat-sealed to form a wheat mildew-proof packaging bag with a bag length of 900mm, a bag width of 580mm, and a capacity of 50kg. The specific process parameters are: (1) Preparation of the bag blank: (1) The surface density of the protective layer is 120g / m 2 , The conventional anti-aging polypropylene spun-bonded non-woven fabric with longitudinal and transverse breaking strength of 1250N / 5cm; 3 / m 2 · 24hr polypropylene / vinylidene chloride / polyethylene three-layer composite oxygen barrier membrane; (3) its prefabricated water-locking layer: (a) mixed opening: using super absorbent fiber (SAF) with a fine...

Embodiment 3

[0065] To prepare rice mildew-proof packaging bags, prefabricate the water-locking layer first, then unwind the roll together with the protective layer, oxygen barrier layer and non-hydrophilic layer, and stack them in the order of the protective layer, oxygen barrier layer, water-locking layer and non-hydrophilic layer , and then thermally compounded, cut, sewn into bags, and heat-sealed to form a rice mildew-proof packaging bag with a bag length of 1070mm, a bag width of 740mm, and a capacity of 100kg. The specific process parameters are: (1) Preparation of the bag blank: (1) The surface density of the protective layer is 150g / m 2 , The conventional anti-aging polypropylene split silk woven fabric with a longitudinal and transverse breaking strength of 1450N / 5cm; (2) The thickness of the oxygen barrier layer is 120μm, and the oxygen transmission rate is 0.2cm 3 / m 2 24hr polypropylene / ethylene-vinyl acetate / polyethylene three-layer composite oxygen-barrier film; (3) its pre...

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Abstract

The invention relates to a method for preparing a mildew-proof grain packing bag with a water locking layer. The method comprises the following steps of: preparing a protective layer by adopting an anti-aging polypropylene material; preparing an oxygen isolating layer by adopting a three-layer composite oxygen isolating film consisting of polypropylene / ethylene-vinyl acetate / polyethylene or polypropylene / vinylidene chloride / polyethylene; blending super absorbent fibers (SAF) and ethylene-propylene side by side (ES) fibers, and preparing the water locking layer by a non-woven processing method; preparing a non-hydrophilic layer by adopting non-hydrophilic polypropylene spun-bond nonwoven cloth or non-hydrophilic polypropylene / polyethylene double-component fiber hot-rolled nonwoven cloth; thermally compounding the protective layer, the oxygen isolating layer, the water locking layer and the non-hydrophilic layer from top to bottom to obtain a bag material; and cutting, sewing, performing hot pressing, sealing the edges, and thus obtaining the mildew-proof grain packing bag with the water locking layer and with high strength. The conventional production equipment can be used in the method, so the method is simple and low in production cost; and by adjusting the proportion of the materials of all layers or the materials in each layer, mildew and toxin are prevented from beingpropagated in the grains in the bag, and the storage, transportation and mildew-proof requirements of various grains are met.

Description

technical field [0001] The invention relates to a method for preparing a grain packaging bag, in particular to a method for preparing a mold-resistant grain packaging bag with a water-locking layer. The prepared grain packaging bag has high strength and high hygroscopicity and is suitable for packaging, storage and transportation Grain with high moisture content. 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 country is a bi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B31B41/00
Inventor 殷保璞王荣武张磊黄潇玲王超洋黄健华汪育松
Owner DONGHUA UNIV
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