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Multi-functional multi-layer composite film for preserving fruits and preparation method thereof

A multi-layer composite, functional layer technology, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problems of uncontrollable sulfur dioxide concentration, excessive sulfur content in food, human body hazards, etc. The effect of controllable concentration and cycle, low production cost and low processing cost

Active Publication Date: 2011-09-07
大家智合(北京)网络科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method of burning sulfur is commonly used in my country to produce sulfur dioxide, but the concentration of sulfur dioxide in this method is not only uncontrollable, but also easily causes the sulfur content of the processed food to exceed the standard, which brings harm to the human body, and the excessive concentration of sulfur dioxide will also pollute the environment

Method used

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  • Multi-functional multi-layer composite film for preserving fruits and preparation method thereof

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Effect test

Embodiment 1

[0032] Using LDPE resin as the basic raw material, add 1% white carbon black powder with a particle size of 5-20 microns to the LDPE resin, and then obtain the LDPE base film under the condition of an inflation ratio of 1:3; in three-color printing equipment On the LDPE base film, the release agent layer, auxiliary layer and protective layer are coated in sequence, and the amount of glue is 2-5g / m 2 The composition of the release agent layer is 5 parts of calcium sulfite powder, 90 parts of VAE aqueous emulsion (equivalent to 45 parts of dry matter weight) with a solid content of 50%; the composition of the auxiliary layer is 7 parts of citric acid, with a solid content of 50% 90 parts of VAE aqueous emulsion (equivalent to 45 parts of dry matter weight); the composition of protective layer is that solid content is 10 parts of VAE aqueous emulsion (equivalent to 5 parts of dry matter weight), and solid content is 100 parts of natural rubber aqueous emulsion of 50% parts (equiv...

Embodiment 2

[0034] Using LDPE resin as the basic raw material, add 3% white carbon black powder with a particle size of 5-50 microns to the LDPE resin, and then obtain the LDPE base film under the condition of an inflation ratio of 1:3; in three-color printing equipment On the LDPE base film, a release agent layer, an auxiliary layer and a protective layer are coated sequentially; other conditions are the same as in Example 1.

Embodiment 3

[0036] Using a commercially available biaxially stretched polypropylene film (BOPP) as the base film, a release agent layer, an auxiliary layer and a protective layer are sequentially coated on the BOPP base film on a three-color printing device; other conditions are the same as in Example 1.

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Abstract

The invention discloses a multi-functional multi-layer composite film for preserving fruits and a preparation method thereof, which are used for preserving fruits such as grapes, winter jujube, lychee, longan and the like. The composite film comprises four functional layers, namely a basal layer, a release agent layer, an auxiliary layer and a protective layer, wherein the basal layer is a plastic film prepared by blowing inorganic filler modified resin; the sulfur dioxide release agent layer coated on the basal layer is made of an adhesive of a suspended sulfur dioxide release agent; the auxiliary layer on the release agent layer consists of organic acid and an adhesive; and the adhesive protective layer on the auxiliary layer is a mixture of ethylene vinyl-acetate copolymer (VAE) or / andnatural rubber. The fruit preserving package has adjustable oxygen penetration rate; sulfur dioxide bactericide gas generated by the composite film has good effect of killing botrvtis cinerea and other pathogenic bacteria, and the bactericide has the characteristics of adjustable concentration and period and low release concentration, and cannot remain on the fruits; and the composite film has good barrier effect on water vapor and prevents the fruits from being damaged due to water loss.

Description

technical field [0001] The invention relates to a multi-functional multi-layer composite film for fresh-keeping fruit and a preparation method thereof. The fruit fresh-keeping film has adjustable oxygen transmission rate, adjustable sulfur dioxide concentration and release period, and is used for grapes, winter jujubes, litchi, longan, etc. Fruit preservation and storage. Background technique [0002] my country is a big fruit producing country. Since 1993, my country's total fruit output and fruit tree cultivation area have surpassed India, Brazil and the United States, ranking first in the world, and the total fruit output accounts for about 12% of the world's total output. my country's fruit consumption market is mainly domestic. Due to the lack of fresh-keeping technology, a large number of fruits are concentrated in the market in the current season, and the price is low and the loss is huge. Even if the fruit is exported, the loss rate of fruit is relatively high due to...

Claims

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Application Information

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IPC IPC(8): B32B27/06B32B27/18B32B3/24B32B33/00B32B7/10B65D81/28
Inventor 李东立许文才付亚波曹国荣刘全校罗世永
Owner 大家智合(北京)网络科技股份有限公司
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