A kind of self-adjusting moisture content fruit and vegetable fresh-keeping packaging bag and its manufacturing method

Abstract

The invention relates to a fruit and vegetable fresh-keeping packaging bag capable of self-adjusting moisture and a producing method thereof. The fruit and vegetable fresh-keeping packaging bag comprises a bag body, wherein an object loading area is arranged on the upper part of the bag body, a water storage area is arranged on the lower part of the bag body, and a fence transition area is arranged between the object loading area and the water storage area; the fence transition area comprises a plurality of water vapor channels which communicate the object loading area with the water storage area and exchange fences which are used for spacing every two adjacent water vapor channels; and the contact angle [theta]a of a membrane material on the inner wall surface of the object storage area is larger than the contact angle [theta]b of a membrane material on the inner wall surface of the fence transition area or the water vapor channels, and the contact angle [theta]c of a membrane material on the inner wall surface of the water storage area is smaller than the contact angle [theta]b. When fruits and vegetables are stored in the fruit and vegetable fresh-keeping packaging bag, the self-adjusting function of humidity in the bag is realized. Compared with common anti-fog fresh-keeping bags, the anti-fog performance is increased by more than 30%, the problem of rotting caused by accumulated water on the lower part of a vegetable area can be solved, the freshness of the fruits and vegetables is effectively improved, and the shelf life of the fruits and vegetables is prolonged.

Description

technical field [0001] The invention belongs to the technical field of processing and storage of agricultural products, and in particular relates to a self-adjusting water content fruit and vegetable fresh-keeping packaging bag. The invention also relates to the production and use method of the packaging bag. Background technique [0002] As a simple and economical post-harvest treatment method for vegetables, film packaging has the functions of moisturizing, air conditioning and bacteria isolation: it can reduce post-harvest transpiration loss of fruits and vegetables, reduce the rate of weight loss, and maintain the freshness of fruits and vegetables; it can make the bag fresh through the spontaneous respiration of vegetables. Internal CO 2 / O 2 The ratio increases, thereby inhibiting respiration and other physiological metabolism; it can also reduce the re-infection of pathogenic bacteria, and reduce the loss of product decay. At present, PE packaging plastics are widel...

AI Technical Summary

Problems solved by technology

[0003] However, film packaging also has a downside

PE film has poor water permeability. When fruits and vegetables are put into the bag for storage, the humidity in the bag will gradually increase, and even condensation will appear. Very easy to grow and multiply, aggravating the rot of fruits and vegetables

At present, the existing anti-fog and moisture-permeable bags reduce the haze on the inner wall of the bag by adding anti-fog agents, which have a certain anti-fog effect on fruit products, but they are not suitable for leafy vegetables with large transpiration such as vegetables and lettuce. In terms of condensation and rot, the effect is not good

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