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Composite film

A composite film and cast film technology, applied in the field of composite films, can solve the problems of reducing the barrier properties of composite films, low transparency, unsatisfactory stretch formability and retort resistance, etc.

Active Publication Date: 2017-02-15
东莞奇妙包装有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process still has some disadvantages
For example, if the fluidity of the raw material resin is high, if the fluidity is too poor or if the fluidity of several resins differs too much, the barrier performance of the composite film will be reduced due to the impact of laminar flow formation, and the transparency is usually not high. Formability and cooking resistance are not ideal

Method used

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Examples

Experimental program
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preparation example Construction

[0033] Preparation method of composite membrane

[0034] In a preferred embodiment, the method of the present invention provides a method for preparing a composite film, comprising the step of laminating at least one layer of cast film and at least one layer of blown film through an adhesive.

[0035] The composite film according to the present invention can be prepared by any appropriate method, for example, by die co-extrusion, film extrusion lamination, adhesive compounding and other methods.

[0036] In order to maximize the advantages of the composite film according to the present invention, the composite film of the present invention can be prepared by, but not limited to, a method comprising the following steps: uniformly coating the adhesive on the casting film, the blown film On the surface to be bonded of the film or both, the surface to be bonded is placed opposite, and the adhesive is cured after rolling and flattening.

[0037] In one embodiment of the present ...

Embodiment

[0047] Some specific implementations of the present invention are explained below in conjunction with examples, so that those skilled in the art can more clearly understand the technical solutions and advantages of the present invention, but do not limit the present invention in any way.

[0048] 1. Materials

[0049] Comparative and Example samples of composite membranes were prepared using the following materials.

[0050]

[0051] 2. Preparation of Composite Membrane

Embodiment 1

[0056] A ReifenHouser SW2200 multilayer coextrusion blown film equipment was used to prepare a PE / PA / EVOH / PA / PE multilayer coextrusion film with a thickness of 58 μm, in which a Bemis adhesive connection layer was used between PE and PA. The die head temperature of the PE layer is 220°C, and the pulling speed is 5.5-8m / min. The die head temperature of the PA layer is 240°C, and the pulling speed is 8-12m / min. The die head temperature of the EVOH layer is 240°C, and the pulling speed is 5-12m / min. The structure of the coextruded film and the composition and thickness of each layer are as follows:

[0057] Raw material composition Thickness (μm) level one PE 23 Second floor Adhesive 2 the third floor PA 2 fourth floor EVOH 4 fifth floor PA 2 sixth floor Adhesive 2 seventh floor PE 23

[0058] Using Taiwan Sanxia DL-S1300 dry compound machine, the PP casting film with a thickness of 60 μm and the first la...

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Abstract

The invention relates to a composite film. The composite film is characterized by comprising at least one layer of casting film, at least one layer of blow-molding film and an adhesive layer located between the casting film and the blow-molding film. The invention also relates to a preparation method and application of the composite film.

Description

technical field [0001] The invention relates to a composite membrane. In particular, the present invention relates to a composite film having improved properties such as improved transparency, retort resistance and / or formability. The invention also relates to the preparation method and application of the composite membrane. Background technique [0002] Plastic film has been widely used in product packaging in food, medicine, chemical industry and other fields, which brings great convenience to people's life. Commonly used polymers that can be used to prepare plastic films include polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), polyester (PET), polypropylene (PP), nylon (PA) and the like. Depending on the structure of the polymer, the resulting plastic film will have different properties. Therefore, multi-functional and high-performance composite films are usually obtained by compounding multiple layers of films with different performance advantages to mee...

Claims

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Application Information

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IPC IPC(8): B32B7/12B32B37/12B65D65/40
CPCB32B7/12B32B27/08B32B37/12B65D65/40Y02W90/10
Inventor 金伟谭声隆
Owner 东莞奇妙包装有限公司
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