Polyolefin thin film with drying agent function and manufacturing method of polyolefin thin film with drying agent function

A desiccant and polyolefin technology, applied in chemical instruments and methods, synthetic resin layered products, lamination devices, etc., can solve problems such as complex procedures, ingestion, and high costs, and achieve the goal of overcoming limitations, simple processes, and high performance high effect

Inactive Publication Date: 2015-04-01
CHONGQING KEXIN PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems that the desiccant in the prior art is usually packaged in advance with paper-based composite film, non-woven fabric or microporous film, the process is complicated, the cost is high, the desiccant leaks or even is swallowed by mistake, the present invention proposes a A polyolefin film with a desiccant function and a preparation method thereof. By implanting desiccant particles into a food packaging bag, the packaging film itself has the moisture absorption function of the desiccant. After packaging the food, the film can absorb moisture in the air in the bag, Keep food in dry state for a long time, thus prolonging the shelf life of food

Method used

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Examples

Experimental program
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preparation example Construction

[0023] The preparation method of the polyolefin film possessing desiccant function of the present invention comprises the following steps:

[0024] The corona layer, the desiccant functional layer, and the heat-sealing layer resin are compounded into one by using the self-adhesiveness of the resin through a three-layer co-extrusion process.

[0025] The material of the desiccant functional layer is first made into a high-concentration filling masterbatch by passing the desiccant particles through a twin-screw extruder, and then blending the masterbatch with a resin in a certain proportion for three-layer co-extrusion to obtain a desiccant Functional polyolefin film.

[0026] The high concentration filling rate of desiccant particles will reduce the transparency and physical and mechanical properties of the film to a certain extent. Selecting a suitable coupling agent for surface modification is conducive to further achieving a better blending effect.

Embodiment 1

[0028] The invention provides a polyolefin film with desiccant function, including a corona layer (1), located on the outer layer, which is used for compounding with other materials after corona treatment; a desiccant functional layer (2), located The middle layer is filled with a high proportion of desiccant particles, which has a strong moisture absorption function; the heat-sealing layer (3), located in the inner layer, plays the role of sealing and making bags. The material of the corona layer (1) is a blended modified product of low-density polyethylene and linear low-density polyethylene; the material of the desiccant functional layer (2) is low-density polyethylene, linear low-density polyethylene, and A blended modification of desiccant particles; the material of the heat-sealing layer (3) is a blend of one or more of low-density polyethylene, linear low-density polyethylene, metallocene polyethylene, and very low-density polyethylene The desiccant particles in the des...

Embodiment 2

[0030] The invention provides a polyolefin film with desiccant function, including a corona layer (1), located on the outer layer, which is used for compounding with other materials after corona treatment; a desiccant functional layer (2), located The middle layer is filled with a high proportion of desiccant particles, which has a strong moisture absorption function; the heat-sealing layer (3), located in the inner layer, plays the role of sealing and making bags. The material of the corona layer (1) is polypropylene; the material of the desiccant functional layer (2) is a blend of polypropylene and desiccant particles; the material of the heat-sealing layer (3) is polypropylene. Propylene is non-copolymerized or ternary copolymerized polypropylene; the desiccant particles in the desiccant functional layer (2) are molecular sieves or calcium oxide with strong hygroscopicity at a relative temperature of 40%RH, or a mixture of the two The filling amount of desiccant particles i...

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Abstract

In order to solve the problems that in the prior art, a drying agent commonly needs to be bagged by paper-based complex film or non-woven fabric or micro-porous film in advance, the working procedure is complex, the cost is high, the drying agent can be leaked even be eaten by mistake, the invention relates to polyolefin thin film with a drying agent function and a manufacturing method of the polyolefin thin film with the drying agent function. As drying agent particles are implanted into a food package bag, packaging film has the moisture absorption function of the drying agent, the thin film can absorb moisture in air in the package bag after food is packaged, the food is in the drying state for a long time, and the food expiration date is accordingly prolonged. The polyolefin thin film comprises a corona layer, a drying agent function layer and a heat sealing layer; the corona layer is located on the outer layer and is a composite layer obtained after corona treatment; the drying agent function layer is located in the middle layer and is a drying agent particle filling layer with the moisture absorption function; the heat sealing layer is located on the inner layer and is a sealing bag manufacturing layer. According to the polyolefin thin film, the drying agent particles are implanted into the food package bag, the packaging film has the moisture absorption function of the drying agent, and therefore the limitation of bagged drying agent application is overcome.

Description

technical field [0001] The invention relates to a polyolefin film with desiccant function and a preparation method thereof, in particular to a polyolefin film for food moisture-proof packaging and a preparation method thereof. Background technique [0002] For food packaging with high moisture-proof requirements, it is necessary to put a bag of desiccant in the packaging bag to absorb the water vapor sealed in the bag during packaging and the water vapor infiltrated into the packaging bag from the outside during storage and circulation, so as to keep the inside of the bag. It is in a dry state for a long time, thereby prolonging the shelf life of food. In the prior art, the desiccant is usually packaged in advance with a paper-based composite film, non-woven fabric or microporous film, and the bagged desiccant bag is packaged together with the food during food packaging. Obviously, there is a problem in the prior art. The packaging method is complex and costly, and there a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06B32B27/18B32B37/10
CPCB32B27/06B32B27/18B32B37/10
Inventor 伍秋涛代模代平周文强周建兵刘彬
Owner CHONGQING KEXIN PLASTIC
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