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Controlled release active gas adjustment fresh-keeping packaging material and preparation method thereof

A packaging material and modified atmosphere preservation technology, which is applied in the field of preparation and application of active modified atmosphere preservation packaging materials, can solve the problems of complex process and limited antibacterial types

Inactive Publication Date: 2016-02-24
BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complexity of the process and the limited antibacterial types of the released preservatives, this overall solution for fresh-keeping packaging is limited in its application in fresh-keeping of fruits and vegetables.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 3wt% thymol, 20wt% styrene-butadiene rubber, 15wt% ethylene-vinyl acetate copolymer and 62wt% low-density polyethylene masterbatch are carried out stepwise melt blending and granulation, and are formed by blown film or extrusion Packaging materials formed by film technology. For fresh strawberries and tangerines packaged with this material, the carbon dioxide and oxygen concentrations in the packaging bags, the good fruit rate and weight loss data of tangerines and strawberries during the fresh-keeping period are shown in the table below. Under the temperature condition of 1-10°C, the storage and preservation period of Shatangju and strawberry can be obviously extended, and the preservation effect is obvious.

[0014] fruit

Embodiment 2

[0016] 1wt% thymol, 3wt% menthol, 20wt% ethylene-vinyl acetate copolymer, 25wt% styrene-butadiene block copolymer, 40wt% low-density polyethylene and 11wt% linear low-density Polyethylene masterbatch, subjected to step-by-step melt blending and granulation, is a packaging material formed by blown film or extrusion film forming process. For the lotus root and strawberry packaged with this material, the carbon dioxide and oxygen concentration in the packaging bag, the good fruit rate and weight loss data of the fruit during the fresh-keeping period are shown in the table below. Under the temperature condition of 18-20°C, the storage period of lotus root and strawberry can be significantly extended, and the preservation effect is obvious.

[0017] fruits and vegetables

Embodiment 3

[0019] 5wt% menthol, 15wt% styrene-ethylene-butylene block copolymer, 20wt% ethylene-vinyl acetate copolymer and 60wt% low-density polyethylene masterbatch were melt blended and granulated step by step, Packaging materials formed by blown film or extrusion film forming processes. For strawberries and tangerines packaged with this material, the carbon dioxide and oxygen concentrations in the packaging bags, the good fruit rate and weight loss of tangerines during the fresh-keeping period are shown in the table below. Under the temperature condition of 8-10°C, the storage period of Shatangju and strawberry can be significantly extended, and the preservation effect is obvious.

[0020] fruit

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Abstract

The invention discloses a controlled release active gas adjustment fresh-keeping packaging material and a preparation method thereof, and belongs to the technical field of food and fruit and vegetable fresh-keeping technologies. The packaging material comprises the following main components: 0.5-10 wt% of a natural antibacterial agent, 5-30 wt% of ethylene-vinyl acetate copolymer, 1-45 wt% of block copolymer and no less than 40 wt% of polyolefin master batch, and is prepared through the following steps: mixing the materials according to the ratio; after carrying out melt blending granulation, carrying out film blowing or extrusion molding. As a packaging film of fresh fruit and vegetables, the material can provide relatively suitable humidity (RH70-98%) and suitable oxygen and carbon dioxide gas adjustment packaging atmosphere for fruit and vegetables, and the natural antibacterial agent is slowly released, so that the respiratory action of fruit and vegetables and the growth of fungus on the surfaces of fruit and vegetables are inhibited, and the effect that the fresh-keeping period of fruit and vegetables is prolonged is achieved.

Description

technical field [0001] The invention belongs to the technical field of food and fruit and vegetable fresh-keeping, and in particular relates to the preparation and application of an active modified atmosphere fresh-keeping packaging material that can controlly release a fresh-keeping agent. technical background [0002] After harvesting, agricultural products such as fresh fruits and vegetables gradually shrink or even rot due to strong respiration and transpiration, accompanied by evaporation of water and consumption of nutrients, making it difficult to keep fresh during transportation and long-term storage. Therefore, fresh fruits and vegetables are often packaged with a packaging film with a certain gas permeability function, which can not only prevent water transpiration, but also reduce the oxygen concentration in the package, thereby slowing down the respiration of fruits and vegetables and prolonging the freshness period of fresh fruits and vegetables. In the patent 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L9/06C08L23/08C08L53/02C08L53/00C08K5/13C08K5/05
CPCC08L23/06C08L2203/16C08L2205/02C08L2205/03C08L2207/066
Inventor 付亚波许文才李东立石佳子曹国荣
Owner BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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