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High isolation and high contraction film using polyvinyl alcohol as intermediate layer and preparation method thereof

A polyvinyl alcohol and high-barrier technology, applied in the field of plastic molding materials, can solve the problems of high manufacturing cost, inability to pack, and inability to absorb the environment, and achieve the effect of good transparency

Inactive Publication Date: 2009-05-06
包头市恒瑞新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of film is currently widely used in ham sausage packaging and raw and cooked meat packaging. Although this technology is widely used, it is not environmentally digestible and cannot be added to the biological cycle, and the manufacturing cost is very high, which is not our ideal. The desired product
The Chinese patent application publication number is CND1405230A, a kind of hydrolyzable biodegradable plastic molding material and its preparation method, which can be used to prepare films by blown film method, which has been widely promoted, but although the single material is degradable, it is Cannot be used as food packaging
As we all know, most degradable materials are hydrophilic substances, so it is impossible to use a single material and a single layer structure for food packaging and other moisture-proof barrier packaging

Method used

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  • High isolation and high contraction film using polyvinyl alcohol as intermediate layer and preparation method thereof
  • High isolation and high contraction film using polyvinyl alcohol as intermediate layer and preparation method thereof
  • High isolation and high contraction film using polyvinyl alcohol as intermediate layer and preparation method thereof

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preparation example Construction

[0015] Such as figure 1 As shown, the high-barrier high-shrinkage film with polyvinyl alcohol as the middle layer and the preparation method thereof include the following steps. The method is carried out by using multiple plasticizing extruders. First, according to the structural requirements of different layers of the film, That is, the requirements of the three-layer or five-layer or seven-layer structure, the materials of each layer, such as polyolefin resin, polyvinyl alcohol, adhesive, polyamide, are put into the extruder, and passed through the co-extrusion die, composite low-temperature air cooling, Traction, heating, synchronous biaxial stretching, that is, flat extrusion top blowing biaxial stretching process, cooling jacket cooling, and winding process to make the finished film. The cooling temperature is 5°C-30°C, the temperature for heating the biaxially stretched mold body is 65-120°C, and the aspect ratio is 1:3.0-5. In the high-barrier and high-shrinkage film, ...

Embodiment 1

[0021] see figure 2 , in multiple plasticizing extruders A / B / A, layer A is polyolefin resin, choose 1F7A or 1F7B low-density polyethylene produced by Yanshan Petrochemical, and add 1% modified degradable additive or The polyamide resin material and the B layer are polyvinyl alcohol (PVA) special materials, which are respectively put into the required extruders according to the film thickness percentages of 30% / 40% / 30%, and are completed through the co-extrusion die head process.

Embodiment 2

[0023] see image 3 , in multiple plasticizing extruders A / B / C / B / A, the A layer is polyolefin resin, and the 1C7A low-density polyethylene produced by Yanshan Petrochemical is selected, and the modified degradable additive or matrix is ​​added. 0.5% of the material is stirred evenly, the B layer is a modified bonding resin (or adopting the 528H resin of Mitsui & Co., Ltd.), and the C layer is a PVA resin, which is extruded through a co-extrusion die to obtain the required film, and the thickness percentage is respectively: 10 % / 20% / 40% / 20% / 10%.

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Abstract

The invention discloses a high-resistant and high-contractive film using polyvinyl alcohol as the middle layer and its making method. The structure of the film is 3-7 layers, and the three-layer structure is PO / PVA / PO, the five-layer structure is PO / glue / PVA / glue / PO, and the seven-layer structure is PO / glue / PA / PVA / PA / glue / PO or PO / glue / PVA / PVA / PVA / glue / PO. The invention adopts the high-molecular material and degraded PVA resin as the obstructing layer. The said PVA resin is the polyvinyl alcohol of the middle layer, PO is polyolefin resin, and PA is polyamide, the glue is the bond. The making method adopt a plurality of plasitification coextrusion machines to implement. Put the materials of each layer into the extrusion machine, pass through coextrusion head, upper cool winding, the draught, the heating and synchronous double-directional extension to get the product. The invention is suitable for the packaging films of various goods and can replace the PVD and ethylene-ethenol polymer.

Description

technical field [0001] The invention relates to an environment-consumable plastic molding material, in particular to a high-barrier high-shrinkage film with polyvinyl alcohol as the middle layer and a preparation method thereof. Background technique [0002] At present, because people pay more and more attention to environmental protection. And seek environmentally degradable, low-cost packaging films. And it has degradability and barrier property, can shrink at low temperature and has good transparency, and it has not been found to be used in food packaging. In the past, degradable products were all about degrading time and speed, and the other intention was to be used in food packaging. Degradable has the opposite purpose to the previous technology. As a food storage grade, the shelf life is about two years, while the packaging material grade is greater than two years and can be degraded. The invention of using multi-layer co-extrusion technology to achieve high barrier ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B29C47/06
Inventor 朱家牧
Owner 包头市恒瑞新材料科技有限公司
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