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Packaging bag

A packaging bag and anti-mildew technology, applied in the field of packaging bags, can solve the problems of food dehydration, unfriendly human body and environment, etc.

Inactive Publication Date: 2017-05-10
CHANGDE JINDE NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Strong oxidants are not friendly to the human body and the environment; while desiccants absorb moisture in the air, they also absorb moisture in the food, causing dehydration of the food

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] refer to figure 2 , the preparation method of the above-mentioned mildew-proof and fresh-keeping coating of the present invention, comprises the following steps.

[0039] Step S110: Provide raw materials, including 20%-60% of resin, 30%-70% of solvent, 0.5%-10% of anti-fungal agent and 0.3%-5% of auxiliary agent by weight percentage.

[0040] Step S120: Mix the resin, solvent and additives uniformly to obtain a mixed liquid.

[0041] Specifically, the temperature at which the resin, solvent and additives are mixed in step S120 is 30-65°C.

[0042] Specifically, step S120 includes the following steps: dissolving the resin in a solvent, stirring at a rotation speed of 100-300 rpm and heating to 30-65°C; adding additives, and continuing at a rotation speed of 200-400 rpm Stir for 30-60 minutes to obtain a mixed solution. The temperature and stirring intensity are controlled in this way to promote the uniform mixing of the mixed liquid.

[0043] Specifically, when the ...

Embodiment 1

[0057] The raw materials are provided, and the content by weight percentage includes: 60% of polyurethane resin, 30% of water, 5% of gingerol, 4% of Tween and 1% of triethylamine.

[0058] Dissolve the polyurethane resin in water, stir at a speed of 300 rpm and heat to 50°C; add additives, and continue stirring for 50 min at a speed of 300 rpm to obtain a mixed solution. The pH of the mixture was 7 after adding triethylamine.

[0059] Gingerol is added dropwise to the mixed solution with stirring at a speed of 600 rpm. After the addition of gingerol is completed, the mixed solution and gingerol are continuously stirred and mixed at a speed of 600 rpm. Cool down to obtain the anti-mildew and fresh-keeping coating.

[0060] The anti-mold and fresh-keeping coating is coated on the substrate, and then treated at 80°C, 90°C, 120°C, 100°C and 85°C for 1.2s respectively to obtain the anti-mold and fresh-keeping coating.

Embodiment 2

[0062] Raw materials are provided, including by weight percentage: 47% of polyvinyl alcohol 2488 resin, 40% of water, 8% of the total amount of sorbic acid and turmeric alcohol, 2% of Tween and 3% of sodium bicarbonate.

[0063] Dissolve polyvinyl alcohol 2488 resin in water, stir at a speed of 100 rpm and heat to 65°C; add additives, and continue stirring for 30 minutes at a speed of 200 rpm to obtain a mixed solution. The pH of the mixture was 8 after adding sodium bicarbonate.

[0064] Sorbic acid and turmeric alcohol are added dropwise under the stirring of 800 rev / mins with rotating speed in mixed solution, after sorbic acid and turmeric alcohol dropwise are finished, mixed solution, sorbic acid and turmeric alcohol are continued to rotate at a speed of 800 rpm. Stir and mix for 2 hours at 500-800 rpm. Cool down to obtain the anti-mildew and fresh-keeping coating.

[0065] The anti-mildew and fresh-keeping coating is coated on the substrate, and then treated at 85°C, 95...

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Abstract

A packaging bag comprises a bag body and a mould-proof preservation coating layer, wherein a storage cavity is formed in the bag body, and the mould-proof preservation coating layer is arranged on the inner surface of the storage cavity; the raw material of the mould-proof preservation coating layer is a mould-proof preservation coating which is prepared from components in percentage by weight as follows: 20%-60% of resin, 30%-70% of a solvent, 0.5%-10% of a mould inhibitor and 0.3%-5% of an auxiliary, wherein the resin is at least one of polyurethane, a acrylate copolymer, polyvinyl alcohol, polyvinylidene chloride, modified polyvinylidene chloride, an ethylene-vinyl acetate copolymer, a polyvinyl acetate copolymer and a vinyl acetate-butyl ester copolymer, and the solvent is at least one of water and ethyl alcohol. According to the packaging bag, the surface of the mould-proof preservation coating layer on the inner surface of the storage cavity is dense and pore-free, and the mould-proof preservation coating layer has better effects of keeping constant moisture and preventing mould by aid of addition of the mould inhibitor. The packaging bag is particularly suitable for preserving food such as fruit, bread, tobacco and the like which have shorter storage life, are prone to mould within short time and need to be eaten timely.

Description

technical field [0001] The invention relates to the technical field of packaging, in particular to a packaging bag. Background technique [0002] The storage conditions for items with a short storage period such as food and tobacco leaves are relatively harsh, otherwise they will become moldy due to the proliferation of microorganisms, making them no longer fresh and losing their original value. At present, desiccants and strong oxidants are commonly used in the industry to achieve fresh-keeping effects. Desiccants are used to create a relatively water-deficient environment to inhibit the growth of mold; strong oxidants are used to kill mold. But these two kinds of methods all have shortcomings. Strong oxidizing agents are not friendly to the human body and the environment; while desiccants absorb moisture in the air, they also absorb moisture in the food, causing dehydration of the food. Contents of the invention [0003] Based on this, it is necessary to provide a pack...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/14C09D175/04C09D129/04C09D187/00C09D131/04C09D7/12B65D30/02
CPCB65D31/00C08K5/0058C08K5/092C08K5/175C09D5/14C09D7/63C09D129/04C09D131/04C09D175/04C09D187/00Y02W90/10
Inventor 韦雪雪杜建军李江晏延兵
Owner CHANGDE JINDE NEW MATERIAL TECH CO LTD
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