Microporous preservative BOPP film and preparation method thereof

Abstract

The invention provides a microporous preservative BOPP film, and belongs to the technical field of biaxially oriented polypropylene films. The microporous preservative BOPP film comprises an upper surface layer, a core layer and a lower surface layer, the upper surface layer is arranged on an upper surface of the core layer, the lower surface layer is arranged on a lower surface of the core layer, the microporous preservative BOPP film is characterized in that the upper surface layer is an anti-adhesion layer, a preset number of micropores formed by laser boring are uniformly formed in the surfaces of the upper surface layer and the lower surface layer, as the laser boring is added in the last procedure of film preparation in the preparation method, the process is simple, the control is accurate, the distances and sizes of the micropores can be adjusted, the prepared film has good air permeability and mechanical property, no micropore defective tearing is generated, and the microporous preservative BOPP film is suitable for averagely regulating and controlling the atmosphere in the package so as to play a better preservative effect.

Description

technical field [0001] The invention belongs to the technical field of biaxially stretched polypropylene film, and more specifically relates to a microporous fresh-keeping BOPP film and a preparation method thereof. Background technique [0002] In recent years, with the improvement of people's living standards and the specialization of agricultural planting, the demand for fresh fruits and vegetables is increasing. Due to the self-breathing effect of fruits and vegetables in the packaging and transportation process, oxygen is consumed to produce gases such as carbon dioxide, and the proportion of gases is constantly changing. It has a ripening effect on the fruits and vegetables themselves, and at the same time, breathing produces water vapor to form a humid environment to breed bacteria and rot. In order to prolong the long-term preservation period of fruits and vegetables, modified atmosphere packaging preservation technology is widely used. At present, the commonly used...

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Problems solved by technology

[0003] The above solutions all have the problem of small pore diameter or closed micropores in the membrane, which cannot quickly and fully adjust the ratio of the atmosphere inside and outside the packaging bag, and the fresh-keeping effect is poor, which cannot meet the requirements of fresh-keeping packaging for fruits and vegetables.

At present, the commonly used method is to use pinholes or cutters with different diameters to punch a series of holes on the film, but this method has a large hole diameter and poor controllability, and cannot achieve the effect of evenly regulating the atmosphere in the package.

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