Transparent steaming and boiling-resistant film and preparation method thereof

A retort-resistant and transparent technology, which is applied in chemical instruments and methods, flexible coverings, packaging, etc., can solve problems affecting the quality of content, retort layering, broken packages, easy water absorption, etc., and achieve improved retort performance Effect

Active Publication Date: 2014-04-02
HUANGSHAN NOVEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are strongly polar amide groups distributed on the main chain of the PA molecule, which is very easy to absorb water. After absorbing water, the performance of the transparent retort-resistant composite film will decrease. Therefore, PA is usually combined with PP and PE with good heat sealing performance and good water resistance. Composite with polyolefin as transparent retort resistant composite film
In the prior art, retort-resistant adhesives are usually used to bond PA and polyolefin to prepare a retort-resistant composite film. Not only is the process cumbersome, but it is also prone to retort delamination and bag breakage during the retort process, which affects the quality of the contents.

Method used

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  • Transparent steaming and boiling-resistant film and preparation method thereof
  • Transparent steaming and boiling-resistant film and preparation method thereof
  • Transparent steaming and boiling-resistant film and preparation method thereof

Examples

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preparation example Construction

[0041] The present invention also provides a preparation method of a transparent retort-resistant film, comprising the following steps:

[0042] The polypropylene, adhesive resin and polyamide are co-extruded to obtain a hot-melt pipe comprising a first polypropylene layer, a first adhesive resin layer and a polyamide layer in successive contact, and the first adhesive resin layer It is formed of adhesive resin and polypropylene, and the mass percentage of the polypropylene is 20% to 30%;

[0043] Blow molding the hot-melt pipe into a film, cooling and setting;

[0044] The outer surface of the film after cooling and setting is subjected to corona treatment to obtain a transparent retort-resistant film.

[0045] The invention adopts a co-extrusion blow molding process to prepare the transparent retort-resistant film, which saves the step of compounding, and the production process is relatively simple.

[0046] First, the raw material resins that form the first polypropylene ...

Embodiment 1

[0056] The seven-layer co-extrusion upper blow molding equipment produced by German W&H company, the model is VAREX, is used for the preparation of heat-sealing film:

[0057] Add the first polypropylene layer raw material (denoted as Y1), the first adhesive resin layer raw material (denoted as Y2), the first polyamide layer raw material (denoted as Y2) and the first polyamide layer raw material (denoted as Y1) respectively Y3), the second polyamide layer raw material (denoted as Y4), the third polyamide layer raw material (denoted as Y5), the second adhesive resin layer raw material (denoted as Y6) and the second polypropylene layer raw material (denoted as Y6) Y7), the specific formula of each raw material is shown in Table 1.

[0058] Table 1 Example 1 prepared transparent retort-resistant film each layer of raw material formula used

[0059]

[0060] The raw materials in the seven barrels were co-extruded and then blow-molded. The inflation ratio was 2.2, and the thick...

Embodiment 2～6

[0063] A retort-resistant film with a thickness of 75 μm was prepared according to the method and equipment provided in Example 1, with the difference that the specific formula of each raw material is shown in Table 2.

[0064] Table 2 The recipe of raw materials used in each layer of the retort-resistant film prepared in Examples 2-6

[0065]

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Abstract

The invention provides a transparent steaming and boiling-resistant film. The transparent steaming and boiling-resistant film comprises a first polypropylene layer, a first adhesive resin layer and a polyamide layer which connect according to a successive order, wherein, the first adhesive resin layer is composed of adhesive resin and polypropylene, the polypropylene accounts for 20% to 30% of the first adhesive resin layer. The invention also provides a method for producing the transparent steaming and boiling-resistant film. Experiments show that the tensile force of the transparent steaming and boiling-resistant film with thickness of 75mum produced by the invention can reach 48(N / 15mm) / 52(N / 15mm), the thermal sealing strength before boiling is 35 (N / 15mm), the thermal sealing strength after boiling is 28 (N / 15mm), and the stripping phenomenon of the polypropylene layer and the polyamide layer can not occur before or after boiling, the transit quantity of water vapor is not higher than 2.75, the transit quantity of oxygen is not higher than 21.48, a PA / RCPP composite film with thickness of 85 mum prepared by using a dry type composite method has comparable performance.

Description

technical field [0001] The invention belongs to the technical field of packaging materials, and in particular relates to a transparent retort-resistant film and a preparation method thereof. Background technique [0002] Retort bags, also known as soft cans, were first successfully developed by the Natick Research Institute of the U.S. Army. They are used to replace edible tinplate cans and glass cans. And obtained a wide range of applications. Retort bags are generally made of polyester, nylon, aluminum foil, and special polyolefin adhesives through a dry composite process to make a composite film, and then matured, cut, and made into a retort bag. [0003] Since food is packaged in a retort bag, it needs to undergo high-temperature sterilization at 121°C to 135°C for 30min to 40min. Therefore, the film and adhesive for making a retort bag must meet the following conditions: high temperature resistance, and the packaging cannot be separated after retort sterilization. Lay...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B32B27/32B32B27/34B32B7/12B65D65/40B29C55/28B29C71/04
Inventor 江继忠崔鹏鲍祖本潘健郝文涛张和平
Owner HUANGSHAN NOVEL
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