High-oxygen-barrier sealing strip taking co-extruded EVOH film as base material and preparation method of high-oxygen-barrier sealing strip

A sealing strip, high resistance technology, applied in the directions of sealing, chemical instruments and methods, coatings, etc., can solve the problems of poor oxygen barrier performance, lack of comprehensive performance such as heat sealing performance and sealing, to improve heat sealing performance, excellent Sealing anti-pollution performance, the effect of reducing the heat sealing temperature

Inactive Publication Date: 2020-12-15
上海万封新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the above-mentioned patent application has only been improved in terms of tensile strength or peel strength, and its comprehensive properties such as heat sealing performance and sealing performance are still insufficient, and the oxygen barrier performance is relatively poor. The oxygen transmission rate of traditional products is 99%. ~100%, so not suitable for use as food packaging

Method used

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  • High-oxygen-barrier sealing strip taking co-extruded EVOH film as base material and preparation method of high-oxygen-barrier sealing strip
  • High-oxygen-barrier sealing strip taking co-extruded EVOH film as base material and preparation method of high-oxygen-barrier sealing strip

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preparation example Construction

[0042] A kind of preparation method taking co-extrusion EVOH film as the high oxygen resistance sealing strip of base material, comprises the steps:

[0043] (1) Coating the EVOH film layer with a primer or polyurethane glue after corona treatment on the surface, and drying at a drying temperature of 50°C-100°C;

[0044] (2) LDPE resin and MLLDPE+LDPE mixed resin are co-extruded successively with the extruding laminating machine on the glued surface of the EVOH film layer obtained in step (1), and are rolled after composite roll pressing and cooling roll pressing;

[0045] (3) maturing the product after step (2), the maturation temperature is 30°C-80°C, and the maturation time is 2 days-7 days;

[0046] (4) repeat the process of above-mentioned steps (1), (2), (3) to the other side of the EVOH film layer of the product after step (3);

[0047] (5) The finished product obtained in step (4) is cut into strip-shaped film strips of specific width, and wound into disc-shaped film ...

Embodiment 1

[0051] The EVOH film layer is treated with surface corona and coated with a primer, the thickness of the EVOH film layer is 10 μm, and the amount of glue applied to the primer or polyurethane glue layer is 0.3g / m 2 . Drying, the drying temperature is 50°C; the LDPE resin and the MLLDPE+LDPE mixed resin are sequentially co-extruded on the glued surface of the EVOH film layer with an extrusion compounding machine. The melt index of LDPE is 4.5 g / 10min, and the extrusion resin temperature is 250°C, LDPE single-side coating amount is 10 g / square meter; MLLDPE content in MLLDPE+LDPE mixed resin is 0%, melt index of MLLDPE+LDPE mixed resin is 4.5 g / 10min, extrusion resin temperature is 250 °C, the single-side coating amount of the MLLDPE+LDPE mixed resin layer is 10 g / square meter. Rolling after composite roll pressing and cooling roll pressing; film aging, the aging temperature is 30°C, and the aging time is 7 days; repeat the above process on the other side of the EVOH film layer...

Embodiment 2

[0053] Apply polyurethane glue to the EVOH film layer after corona treatment on the surface, the thickness of the EVOH film layer is 15 μm, and the glue amount of the primer or polyurethane glue layer is 1.5g / m 2 . Drying, the drying temperature is 100°C; the LDPE resin and the MLLDPE+LDPE mixed resin are sequentially co-extruded on the glued surface of the EVOH film layer with an extrusion compounding machine. The melt index of LDPE is 15 g / 10min, and the extrusion resin temperature is 350°C, LDPE coating amount on one side is 20 g / m2; MLLDPE content in MLLDPE+LDPE mixed resin is 100%, melt index of MLLDPE+LDPE mixed resin is 20 g / 10min, extrusion resin temperature is 350 ℃; MLLDPE+LDPE mixed resin layer coating amount of one side is 20 grams / square meter;. Rewinding after lamination by compound roll and cooling roll; film curing, the curing temperature is 80°C, and the curing time is 2 days; repeat the above process on the other side of the EVOH film layer to obtain the p...

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Abstract

The invention relates to the technical field of sealing materials, in particular to a high-oxygen-barrier sealing strip with a co-extruded EVOH film as a base material and a preparation method thereof. The high-oxygen-barrier sealing strip comprises a sealing strip body, and the sealing strip body is formed by compositing an MLLDPE + LDPE mixed resin layer, an LDPE resin layer, a primer or polyurethane glue layer, an EVOH film layer, an LDPE resin layer and an MLLDPE + LDPE mixed resin layer. The packaging bag is low in elongation at break, high in strength, good in cutting performance and suitable for a high-speed filling production line and sterile pillow type packaging; due to excellent low-temperature heat sealing performance, temperature resistance and low heat shrinkage rate, the deformation and shrinkage of the film during high-frequency heating or hot plate heating in the use process are avoided, and good dimensional stability is achieved; good water blocking performance and excellent oxygen blocking performance are achieved, and an effective protection effect on the filled food is achieved.

Description

technical field [0001] The invention relates to the technical field of sealing materials, in particular to a high oxygen resistance sealing strip with a co-extruded EVOH film as a base material and a preparation method thereof. Background technique [0002] The sealing strip for paper-plastic-aluminum liquid aseptic packaging materials has the characteristics of low initial heat-sealing temperature, airtightness, barrier property and rigidity, especially the peeling strength does not decrease after liquid immersion. With the continuous development of domestic paper-plastic-aluminum liquid aseptic packaging and the continuous improvement of the packaging speed of filling lines, the sealing strips produced by domestic nylon co-extrusion films cannot be well adapted due to the shortcomings of easy stretching and poor cutting performance. There are certain limitations in the use of high-speed filling equipment and pillow packaging technology. [0003] CN101115618A discloses a m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B7/12B32B27/32B32B33/00B32B27/30B32B27/06B32B27/08B65D53/02B29C48/21B29C48/00
CPCB32B7/12B32B27/32B32B33/00B32B27/306B32B27/08B65D53/02B29C48/21B29C48/0018B32B2255/10B32B2307/7244B32B2307/31B32B2307/7145B32B2307/54B32B2307/734
Inventor 郦国强汪慧蓉
Owner 上海万封新材料技术有限公司
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