Fresh-keeping film with function of controlling respiration of fruits and vegetables and method for preparing fresh-keeping film

Abstract

The invention discloses a method for preparing a breathable fruit and vegetable fresh-keeping film. The breathable fruit and vegetable fresh-keeping film comprises two layers of films. The upper layer is a laser perforated film layer, and the lower layer is a film layer loaded with functional components of antibacterial agents and antioxidants. The method includes punching holes in base materials to form laser perforated films with the sizes of 3-1000 micrometers; blending polyethylene, polypropylene, polylactic acid and polyhydroxyalkanoate base material resin and the functional components of the antibacterial agents and the antioxidants by the aid of a double-screw machine to form film spraying liquid; compounding inner-layer films with the functional components and outer-layer laser perforated films by the aid of film spraying processes to obtain the breathable fruit and vegetable fresh-keeping film. The base materials are polyethylene, polypropylene, polylactic acid and polyhydroxyalkanoate resin with the thicknesses of 10-100 micrometers. The antibacterial agents are mixtures of a type or a plurality of types of potassium sorbate, paraben esters and sodium benzoate food-grade antibacterial agents, and the additive amount of the antibacterial agents is 0.5-5.0%; the antioxidants are mixtures of a type or a plurality of types of tea polyphenols, butylated hydroxyanisole and propyl gallate, and the additive amount of the antioxidants is 0.5-5.0%.

Description

technical field

[0001] The invention relates to a chemical product used for packaging, in particular to a method for preparing a breath-controlling fruit and vegetable fresh-keeping film, which belongs to the technical field of food fresh-keeping packaging. Background technique

[0002] Plastic wrap is a kind of food packaging material commonly used by people. It is a commonly used plastic film product that can maintain a certain freshness of the packaged food for a certain period of time. The preservation of fruits and vegetables should provide a suitable storage environment for fruits and vegetables according to the characteristics of their physiological activities. Since fruits and vegetables are organic organisms in nature, during their storage, the life activities of fruits and vegetables should be maintained moderately, their aging process should be delayed, and their freshness, flavor and nutrition should be maintained. In terms of technical process and effect, it is...