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

A technology of fresh-keeping and fresh-keeping film for fruits and vegetables, which is applied in the field of food fresh-keeping packaging, and can solve problems such as insufficient strength, single function, and unstable effect.

Active Publication Date: 2017-05-17
JIANGMEN PROUDLY WATER SOLUBLE PLASTIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the strength is not enough, the air permeability cannot meet the requirements of use, the effect is unstable, and the function is single, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take a polyethylene film with a thickness of 50 microns, use a laser punching machine, uniformly distribute holes in the polyethylene film with a pore size of 3 microns, and then perform uniaxial stretching at a stretching speed of 200 mm / min and a stretching temperature of 100 ℃, stretching ratio is 5%, obtains the polyethylene film that has good gas permeability and mechanical property, is used for perforation thus, is used as the breathable outer layer of composite fresh-keeping film with this polyethylene film that is clothed with laser holes.

[0019] The selected polypropylene resin, potassium sorbate antibacterial agent, and butyl hydroxyanisole antioxidant are blended on a twin-screw extruder to form a co-coating material, wherein the antibacterial agent potassium sorbate is added in an amount of 0.5% by mass fraction, and the antioxidant The amount of butyl hydroxyanisole added is 1.5% by mass fraction.

[0020] The blended composite polypropylene is combined w...

Embodiment 2

[0023] Take a polyethylene film with a thickness of 100 microns, use a laser punching machine, and uniformly distribute holes in the polyethylene film with a pore size of 100 microns, and then perform biaxial stretching. The stretching speed is 2000 mm / min, and the stretching temperature is 140 ° C. The stretching ratio is 4%, thus obtaining an available polyethylene film with holes with good air permeability and mechanical properties, and the stretched film clothed with laser holes is used as the outer layer of the composite fresh-keeping film. .

[0024] The selected polyethylene resin, gold Nepalese antibacterial agent, and tea polyphenol antioxidant were blended on a twin-screw extruder to form a co-coating material. The added amount of tea polyphenols is 0.5% by mass fraction.

[0025] The blended composite polyethylene and the perforated and stretched outer film are combined by a laminating machine to form a double-layer structure of breathable fruit and vegetable fresh...

Embodiment 3

[0028] Take a polypropylene film with a thickness of 10 microns, use a laser punching machine, and uniformly distribute holes in the polypropylene film with a pore size of 1000 microns, and then perform biaxial stretching, with a stretching speed of 10 mm / min and a stretching temperature of 120 ° C. The stretching ratio is 5%, thus obtaining an available polypropylene film with holes with good air permeability and mechanical properties, and the stretched film clothed with laser holes is used as the outer layer of the composite fresh-keeping film. .

[0029] The selected polylactic acid ester, potassium sorbate and sodium benzoate antibacterial agent, tea polyphenols and propyl gallate antioxidant are blended on a twin-screw extruder to form a co-coating material, wherein the addition of antibacterial agent potassium sorbate is The mass fraction is 2.5%, the added amount of sodium benzoate is 1.5%, the added amount of antioxidant tea polyphenol is 3.0%, and the added amount of ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C09D123/12C09D123/06C09D167/04C09D5/14C09D7/12B29C41/30B29C41/32C08L23/06C08L23/12C08L67/04B29L7/00
CPCB29C41/30B29C41/32B29L2007/00C08J7/0427C08J2323/06C08J2323/12C08J2367/04C08J2423/06C08J2423/12C08J2467/04C08K5/098C08K5/13C08K5/1345C08K5/1545C08K2201/014C09D5/14C09D7/63C09D123/06C09D123/12
Inventor 李立樊敏樊力源杜雪梅黄元叁郭建业
Owner JIANGMEN PROUDLY WATER SOLUBLE PLASTIC CO LTD
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