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Preservative film and preparation method thereof

A technology of plastic wrap and barrier coating, which is applied in the field of plastic wrap and its preparation, can solve the problems of insufficient water vapor and air barrier ability, unfriendly human body and environment, poor compactness of plastic wrap, etc., and achieve good anti-mold and bactericidal effect, Guaranteed preservation effect, good ability to block water vapor and air

Active Publication Date: 2020-07-21
常德市德源招商投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, strong oxidants are not friendly to the human body and the environment. While desiccants absorb moisture in the air, they also absorb moisture in food, which in turn causes food dehydration.
[0003] At present, in the food packaging fields of family life, supermarkets, hotels and restaurants, and industrial production, more and more plastic wraps are used for food preservation, but the traditional plastic wraps are poor in compactness and have a barrier to water vapor and air. Insufficient capacity, poor fresh-keeping effect

Method used

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  • Preservative film and preparation method thereof
  • Preservative film and preparation method thereof

Examples

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preparation example Construction

[0033] A method for preparing a fresh-keeping film according to an embodiment of the present invention includes the following steps S1-S3:

[0034] S1. Obtain the base layer, and the base layer includes the opposite first side and the second side;

[0035] S2, apply a mildew-proof coating on the first side.

[0036] S3. Coating a barrier coating on the second side to obtain a fresh-keeping film.

[0037] Optionally, the base layer is polyethylene terephthalate and / or polyamide, the antifungal coating comprises 65%-85% resin and 15%-35% antifungal agent, and the barrier coating comprises 5%-40%. % polyvinyl alcohol, 5% to 25% agar, 0.05% to 5% borax, 0.05% to 5% boric acid and 30% to 85% water. It can be understood that the specific types of the base layer, the anti-mildew coating and the barrier coating are not limited to this. applicable to the present invention.

[0038] Optionally, the resin in the anti-mildew coating is partially hydrolyzed ethylene-vinyl acetate copol...

Embodiment 1

[0066] A base layer is obtained, the base layer includes opposing first and second sides.

[0067] After the base layer goes through the unwinding step, the anti-mold coating is applied on the first side by forward coating, and the barrier coating is applied on the second side by reverse coating, and the dry coating amount is 2.2g / m2 2 , the coating speed is 100m / min.

[0068] Then use a smoothing brush to smooth the anti-mildew coating and the barrier coating, and the smoothing brush is perpendicular to the contact surface when it is in contact with the anti-mildew coating or the blocking coating, and the pressure of the smoothing brush is 3kg.

[0069] The anti-mildew coating and barrier coating on the surface of the base layer are dried with a suspension oven. The temperature field of the suspension oven from the inlet end to the outlet end is 45°C, 110°C, 140°C, 150°C, and 110°C.

[0070] The surface of the anti-mildew coating and the surface of the barrier coating are ho...

Embodiment 2

[0072] The preparation method is basically the same as that of Example 1, except that the first side and the second side are coated with a mildew-proof coating and a barrier coating respectively in a forward coating manner.

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Abstract

The invention relates to a fresh-keeping film and a preparation method thereof. The preparation method for the fresh-keeping film comprises the following steps: to obtain a base layer, wherein the base layer comprises opposite first face and second face; coating a mildew-proof coating on the first face; and coating a separation coating on the second face, to obtain the fresh-keeping film. A double-face coating mode is used in the preparation method, the fresh-keeping coatings are coated on two faces of the base layer, and one face is coated with the mildew-proof coating, and the other face is coated with the separation coating. The fresh-keeping film has the good compactness, and better property of blocking water vapor and air, and has the good anti-mildew bactericidal effect. The fresh-keeping effect of the fresh-keeping film is improved by the synergistic effect of two coatings.

Description

technical field [0001] The invention relates to the technical field of fresh-keeping, in particular to a fresh-keeping film and a preparation method thereof. Background technique [0002] Fresh foods such as fruits, meats and other items with a short storage period are stored under harsh conditions, otherwise they will be mildewed due to the proliferation of microorganisms, making them no longer fresh and losing their original value. The traditional method in the industry is to use desiccant and strong oxidant to achieve freshness preservation, use desiccant to create a relatively water-deficient environment, inhibit the growth of mold, and use strong oxidant to kill mold. However, strong oxidants are not friendly to the human body and the environment. The desiccant absorbs the moisture in the air and also absorbs the moisture in the food, thereby causing the problem of food dehydration. [0003] At present, in the field of food packaging in family life, supermarkets, hotel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/054C08J7/048C09D123/08C09D127/16C09D127/22C09D133/04C09D175/04C09D5/14C09D7/63C09D7/65C09D129/04C09D105/12B05D5/00B05D7/04B05D1/28B65D65/42C08L67/02
CPCB05D1/28B05D5/00B05D7/04B65D65/42C08J7/04C08J2367/02C08J2405/12C08J2423/08C08J2427/16C08J2427/22C08J2429/04C08J2433/04C08J2475/04C08K2003/387C08L2201/14C08L2205/02C08L2205/035C08L2205/04C08L2207/53C09D5/14C09D105/12C09D123/0853C09D123/0861C09D127/16C09D127/22C09D129/04C09D133/04C09D175/04C08L27/16C08L27/22C08L23/0861C08L33/04C08L75/04C08L5/08C08K5/0058C08L23/0853C08L5/12C08K3/38C08L29/04
Inventor 张勇军钟文罗臻韦雪雪田璐
Owner 常德市德源招商投资有限公司
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