Unlock instant, AI-driven research and patent intelligence for your innovation.

A heat-sealing film and a cover film using the heat-sealing film

A film and heat-sealing layer technology, applied in the field of plastic flexible packaging, can solve the problems of difficult to tear, high cost, easy to cut tofu, etc., and achieve the effect of improving the thermal viscosity of the seal, meeting the strength requirements, and easily tearing the cover film.

Active Publication Date: 2018-05-04
永新股份(黄山)包装有限公司
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the plastic box is made of polypropylene (PP). PP has the characteristics of low density and rigid strength, but the heat-resistant temperature is only about 100°C. Most of the existing cover films use PET / EVA. Although PET / EVA can be combined with PP Very good sealing, but its cost is high, and the viscosity with the plastic box is high, it is difficult to tear it apart by hand. Usually, a knife is used to cut the cover film along the inner wall of the plastic, which is very inconvenient and easy to cut the tofu inside
However, other existing cover film structures have high melting points and cannot meet the requirements of PP heat sealing.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A heat-sealing film and a cover film using the heat-sealing film
  • A heat-sealing film and a cover film using the heat-sealing film
  • A heat-sealing film and a cover film using the heat-sealing film

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The present invention also provides a preparation method for the above-mentioned heat-sealing film, comprising: mixing m-LLDPE, low-density polyethylene, and silicone masterbatch at a ratio of 50:5-10:1-2.5 by weight and then mixing them uniformly at 130°C ~160℃ extrusion blow molding. This blow molding process is a method well known to those skilled in the art. Specifically, a certain proportion of M-LLDPE, 2426H type LDPE and silicone masterbatch are mixed uniformly, melted by an extruder to form a tube blank, and the tube blank is stretched Finally, the compressed air is blown out from the center of the die head of the extruder to inflate the tube blank into a bubble film, and at the same time, the bubble film is cooled and shaped to obtain a film.

[0020] The present invention also provides a cover film, which is mainly used in the field of food plastic packaging, including a surface layer, a middle layer and an inner layer, and the material of the surface layer an...

Embodiment 1

[0024] Example 1: Mix 95KGm-LLDPE, 15KG2426H and 5KG silicone masterbatch evenly and add it into the barrel of the extruder, melt it through the extruder and form a tube blank, stretch the tube blank and punch it from the center of the extruder die Compressed air is blown out to blow the tube blank into a bubble-shaped film, and the bubble-shaped film is cooled and shaped by the air ring cooling air to obtain a heat-sealed film. The process parameters of the extruder equipment are set in Table 1.

[0025] Table 1 extruder process parameters:

[0026]

Embodiment 2

[0027] Example 2: Mix 100KGm-LLDPE, 12.5KG2426H and 4KG silicone masterbatch evenly and add them to the barrel of the extruder. Others are the same as in Example 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thermal resistanceaaaaaaaaaa
melt flow indexaaaaaaaaaa
melting pointaaaaaaaaaa
Login to View More

Abstract

The invention discloses a heat-sealing film. The heat-sealing film comprises, in percentage by weight, 80%-89% of m-LLDPE (metallocene-linear low density polyethylene), 8.9%-16% of low-density polyethylene and 1.8%-4% of silicone master batch. The invention further discloses a cover film. The cover film comprises a surface layer, a middle layer and an inner layer, wherein the surface layer and the middle layer are made of polyethylene glycol terephthalate; the inner layer at least comprises a heat sealing layer; the heat sealing layer comprises, in percentage by weight, 80%-89% of m-LLDPE, 8.9%-16% of low-density polyethylene and 1.8%-4% of silicone master batch. The heat-sealing film has the advantages of a good heat sealing property with a box made of a PP (polypropylene) material and low cost. The cover film made of the heat-sealing film has the advantages of good hand tearing feeling, convenience in tearing and low cost and can be widely applied to the field of sealing films of PP boxes.

Description

technical field [0001] The invention relates to the field of plastic flexible packaging, and more specifically relates to a heat-sealing film and a preparation method thereof, and a cover film using the heat-sealing film and a preparation method thereof. Background technique [0002] Tofu is a favorite dish of many people, but because tofu is relatively soft, it is easy to crush during carrying, especially soft tofu, which cannot be transported over long distances, which is one of the reasons why most tofu workshops cannot expand. With the development of industrialization, plastic boxes have been used to hold tofu. The plastic box is made of hard plastic, which is not easy to deform and ensures that the tofu will not be deformed under pressure. At the same time, the plastic box is sealed with a cover film. Usually, the plastic box is made of polypropylene (PP). PP has the characteristics of low density and rigid strength, but the heat-resistant temperature is only about 100°...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08L23/06C08L83/04B29C49/04B32B27/08B32B27/32B32B27/36B32B27/18B32B37/12
CPCB29C49/04B32B27/08B32B27/18B32B27/32B32B27/36B32B37/12B32B2250/24B32B2307/31B32B2435/02C08L23/06C08L23/0815C08L2203/16C08L2203/162C08L2205/02C08L2205/03C08L2207/066C08L2314/06C08L83/04
Inventor 潘健胡继超汪学文汪飞曹斐
Owner 永新股份(黄山)包装有限公司