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Method for preparing modified atmosphere fresh-keeping film for fruits and vegetables

A technology for air-conditioned fresh-keeping, fruits and vegetables, which is applied in the field of preparation of air-conditioned fresh-keeping films for fruits and vegetables, and achieves the effects of delaying breathing peak, prolonging fresh-keeping time, and improving humidity.

Inactive Publication Date: 2011-06-01
NAT ENG AN TECH RES CENT FOR PRESERVATION OF AGRI PROD TIANJIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no precedent for the application of poly-4-methyl-1-pentene film in fruit and vegetable preservation in China. The research and development of poly-4-methyl-1-pentene fruit and vegetable preservation film can make up for the vacancy in the market and has broad prospects

Method used

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  • Method for preparing modified atmosphere fresh-keeping film for fruits and vegetables

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 70kg of poly-4-methyl-1-pentene, 20kg of linear low-density polyethylene, 1kg of ethylene absorption and decomposition agent, 5kg of inorganic filler, 0.1kg of coupling agent, 0.1kg of dispersant, and 5kg of other additives, passed through a high-speed mixer After mixing, put it into an internal mixer to knead evenly, then granulate, and then add it to a twin-screw extruder. The molten masterbatch is extruded and stretched through an annular die to form a modified atmosphere fresh-keeping film for fruits and vegetables with a thickness of 20 microns. The fresh-keeping film is made into a fresh-keeping bag of the required specification with a heat-sealing bag making machine.

Embodiment 2

[0023] Bananas, apples and pears that are about 75 to 80% ripeness to be harvested in good time are selected and graded, and 10 kg of each kind of fruit is taken, packed and tied with the fresh-keeping bag described in Example 1, respectively at 14 to 100 kg. Storage at 16°C, -1~0°C, and 0°C.

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Abstract

The invention relates to a method for preparing a modified atmosphere fresh-keeping film for fruits and vegetables. The fresh-keeping film is prepared by compounding an ethylene absorption and decomposition agent with gas absorbency and resin. The modified atmosphere fresh-keeping film comprises the following components in percentage by weight: 60 to 80 percent of poly(4-methyl-1-pentene) resin, 10 to 20 percent of low-density polyethylene, 2 to 5 percent of inorganic moisture-penetrating agent and 0.1 to 5 percent of ethylene absorption and decomposition agent. The modified atmosphere fresh-keeping film has the advantages of retarding the metabolic ageing of the fruits and the vegetables and prolonging the quality guarantee periods of the fruits and the vegetables, along with high carbon dioxide and oxygen permeability, high moisture-penetrability, ethylene absorption and decomposition functions, and relatively better fresh-keeping effects on the fruits such as bananas, apples and the like.

Description

technical field [0001] The invention belongs to the technical field of food preservation, and in particular relates to a preparation method of a modified atmosphere preservation film for fruits and vegetables. technical background [0002] Spontaneous modified atmosphere preservation of fruits and vegetables uses a film with a certain degree of air permeability to pack the harvested fruits and vegetables. It relies on the metabolism of the fruits and vegetables to reduce the oxygen concentration in the packaging bag and maintain a certain carbon dioxide concentration and humidity in the bag, thereby extending the freshness period. The currently commonly used plastic wraps are polyethylene and polyvinyl chloride films, which have obvious effects on the modified atmosphere preservation of most fruits and vegetables. However, the physiological characteristics of each fruit and vegetable after harvest are different. For fruits and vegetables with high respiration intensity or p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/20C08L23/08C08K13/02C08K3/24C08K3/22C08K3/34C08K3/26C08K3/36A23B7/00
Inventor 李家政毕大鹏
Owner NAT ENG AN TECH RES CENT FOR PRESERVATION OF AGRI PROD TIANJIN
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