Polypropylene film capable of resisting fog and preparation method thereof

A polypropylene film, polypropylene technology, applied in chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the anti-fog effect of poor durability, easy to be washed or wiped off, anti-fog performance Can not meet the use requirements and other problems, to achieve the effect of good transparency, excellent anti-fog effect, and conducive to manufacturing and promotion

Inactive Publication Date: 2012-02-15
JIANGYIN TONGLI OPTOELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Its anti-fog performance cannot meet the requirements of use, and the use in some occasions requires a two-way anti-fog function
[0005] 2. The form of external coating is adopted, that is, after the anti-fogging a...

Method used

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  • Polypropylene film capable of resisting fog and preparation method thereof
  • Polypropylene film capable of resisting fog and preparation method thereof
  • Polypropylene film capable of resisting fog and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of preparation method of the polypropylene film with anti-fog performance of the present invention, adopts following process step:

[0041] The polypropylene functional film that can prevent water vapor from forming fog on the film surface and affecting transparency of the present invention includes a co-extruded upper surface layer 1 (functional layer), a core layer 2 (substrate layer), and a lower surface layer 3 (functional layer). layer), when making this film, the upper surface layer, the core layer and the lower surface layer are co-extruded composite structures, and these three layers constitute the most basic three-layer structure of the film of the present invention. The total thickness of the film is 25 μm, the thickness of the upper surface layer is 1.1 μm, and the thickness of the lower surface layer is 1.1 μm.

[0042] 1. Drying treatment of raw materials: Since the degree of degradation of the stretched film and whether there are bubbles on the film...

Embodiment 2

[0065] A kind of preparation method of the polypropylene film with anti-fog performance of the present invention, adopts following process step:

[0066] When the present invention manufactures the film, the upper surface layer, the core layer and the lower surface layer are co-extruded composite structures, and these three layers constitute the most basic three-layer structure of the film of the present invention. The total thickness of the film is 30 μm, and the thickness of the upper surface layer and the lower surface layer is 1.1 μm.

[0067] 1. Raw material drying treatment: Since the degree of degradation of the stretched film and whether there are bubbles on the film are related to the moisture content in the raw material, the advanced BOPP production line should also dry the raw material at 80°C to 110°C before extrusion. Drying time 2 ~ 4hrs. Especially in the production of co-extruded films, the raw materials of the core layer contain many hygroscopic additives, an...

Embodiment 3

[0093] A kind of preparation method of the polypropylene film with anti-fog performance of the present invention, adopts following process steps:

[0094] When the present invention manufactures the film, the upper surface layer, the core layer and the lower surface layer are co-extruded composite structures, and these three layers constitute the most basic three-layer structure of the film of the present invention. The total thickness of the film is 35 μm, and the thickness of the upper surface layer and the lower surface layer is 1.1 μm.

[0095] 1. Raw material drying treatment:

[0096] Since the degree of degradation of the stretched film and whether there are bubbles on the film are related to the moisture content in the raw material, the advanced BOPP production line should also dry the raw material at 80℃~110℃ before extrusion, and the drying time is 2~4hrs. Especially in the production of co-extruded films, the raw materials of the core layer contain many hygroscopic...

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Abstract

The invention relates to a polypropylene film capable of resisting fog and a preparation method thereof. The film comprises an upper surface layer, a core layer and a lower surface layer. The preparation method comprises the following steps that: mixed materials of the core layer are dried and tandem extruded by a first core layer extruder and a second core layer extruder to obtain a fused core layer material; mixed materials of the upper surface layer and the lower surface layer are dried and respectively extruded by an auxiliary extruder to obtain a fused upper surface layer material and a fused lower surface layer material, the fused core layer material, the fused upper surface layer material and the fused lower surface layer material are respectively filtered with a disk filter, join together in a die head of an extruder through pipelines and are extruded to obtain a thick plate, the thick plate is cooled and bidirectionally drawn to obtain a film, and the film is subjected to corona treatment, rolling up and slitting to obtain a finished product. The polypropylene film provided in the invention can prevent fog drops from forming and has an excellent fog resisting effect, good transparency and great heat-sealing strength; fog resisting films with different performance and effects can be fabricated according to different articles to be packaged, different preserving/storing conditions and different requirements of utilization, and all the performance indexes of fabricated films can meet requests for utilization.

Description

technical field [0001] The invention relates to a polypropylene film with anti-fog performance and a preparation method thereof, in particular to a polypropylene functional film capable of preventing water vapor from forming fog on the surface of the film and affecting transparency, and belongs to the technical field of food packaging. Background technique [0002] Anti-fog film is a functional film that prevents water vapor from forming fog on the surface of the film and affecting transparency. Biaxially oriented polypropylene anti-fog film will not form mist due to the evaporation of water on the surface of the film under high and low temperature changes. It is mainly used for packaging of fresh fruits, vegetables, salads, edible fungi, etc. Due to the large water content of fresh products, the temperature changes greatly during storage, transportation and sales, and a layer of opaque water mist is generated on the inner layer of the packaging bag, so that users cannot see...

Claims

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Application Information

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IPC IPC(8): B32B27/18B32B27/32
Inventor 周永南张科
Owner JIANGYIN TONGLI OPTOELECTRONICS TECH
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