A kind of extruded diffusion film and preparation method thereof

A diffusion film and extrusion type technology, applied in the field of diffusion film, can solve the problems of harming the environment and human health, complex production process of coating diffusion film, etc., to improve environmental health, simple and convenient production process, high light transmittance Effect

Active Publication Date: 2019-10-18
NINGBO CHANGYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of complex manufacturing process of the existing coating type diffusion film, the present invention provides an extrusion type diffusion film and its preparation method
The manufacturing method of the diffusion membrane provided by the present invention solves the problem of complex manufacturing process of the existing coating type diffusion membrane, and also solves the problem that the existing coating type diffusion membrane is harmful to the environment and human health

Method used

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  • A kind of extruded diffusion film and preparation method thereof
  • A kind of extruded diffusion film and preparation method thereof
  • A kind of extruded diffusion film and preparation method thereof

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preparation example Construction

[0046] Such as figure 2 Shown, the present invention provides a kind of preparation method of extruded diffusion membrane, described method comprises the following steps:

[0047] (1) The four-layer co-extrusion of the extruder simultaneously extrudes the diffusion A layer, base film B layer, base film C layer, and diffusion D layer; after the four layers are extruded at the same time, they reach the cooling roll by casting, and then pass through Two-way stretch;

[0048] (2) Forming the diffusion film after cooling and forming.

[0049] The test method of the main performance of the diffusion membrane provided by the invention is briefly described as follows:

[0050] (1) The light transmittance and haze of the diffuser film are measured by HunterLab UltraScan PRO ultra-high-precision spectrophotometer, and the test conditions are carried out in accordance with the national standard GB2410-1980. And the implementation of haze and light transmittance: haze ≥ 84%, light tra...

Embodiment 1

[0056] The invention provides an extruded diffusion film. The diffusion film is sequentially composed of a diffusion A layer, a base film B layer, a base film C layer, and a diffusion D layer. The diffusion A layer and the diffusion D layer are respectively located on the base film Layer B and the outer side of layer C of the base film; the diffusion film is a four-layer co-extruded structure. The diffusion A layer includes diffusion particles and PET, the diffusion D layer includes diffusion particles and PET, and the diffusion particles and PET are mixed and then extruded to form the diffusion A layer and the diffusion D layer. It is co-extruded by four layers of extruder, then cast onto the cooling roll, stretched by cast sheet, and finally cooled and formed to form an extruded diffusion film.

[0057] Wherein, the thickness of the diffusion A layer is 10 μm, the diffusion particles of the diffusion A layer are methyl silicone, the particle diameter of the diffusion particl...

Embodiment 2

[0059] The extruded diffusion film as described in Example 1, wherein the thickness of the diffusion A layer is 5 μm, the diffusion particles of the diffusion A layer are methyl silicone, the particle size of the diffusion A layer is 2 μm, and the proportion is PET. 40%. The B layer of the base film is PET with a thickness of 160 μm, and the C layer of the base film is PET with a thickness of 5 μm. The thickness of the diffusion D layer is 5 μm, the diffusion particles of the diffusion D layer are PU, the particle diameter of the diffusion D layer is 5 μm, and the proportion is 50% of PET.

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Abstract

The invention relates to a diffusion film used in a backlight source in a liquid crystal display, in particular to an extruded diffusion film and a preparation method thereof. In order to solve the problem of complex manufacturing process of the existing coating-type diffusion membrane, the invention provides an extrusion-type diffusion membrane and a preparation method thereof. The diffusion film is sequentially composed of a diffusion A layer, a base film B layer, a base film C layer, and a diffusion D layer, and the diffusion A layer and the diffusion D layer are respectively located outside the base film B layer and the base film C layer; The diffusion membrane is a four-layer co-extruded structure. The extruded diffusion film provided by the present invention has higher light transmittance, higher haze, higher luminance performance, higher shielding performance, higher light uniformity, and does not scratch the light guide plate function, and the diffusion film can effectively solve the problem of light shadow after being applied in the backlight module. The preparation method of the extruded diffusion membrane provided by the invention is simple and convenient in process, improves production efficiency, reduces production cost, and improves environmental health.

Description

technical field [0001] The invention relates to a diffusion film used in a backlight source in a liquid crystal display, in particular to an extruded diffusion film and a preparation method thereof. Background technique [0002] The diffusion film is one of the most important optical films widely used in the backlight module of liquid crystal display. The main purpose of the diffusion film is to uniformly convert the point light source in the backlight into a surface light source, and use the diffusion film to diffuse the light to achieve uniformity. At the same time, it has a certain shielding effect (shading the shadow of the lamp). [0003] At present, the diffusion film is prepared on the basis of the PET base film, which is coated with a diffusion particle layer and a back-coated particle layer on the front and back sides successively through off-line coating. The coating material is made of special acrylic resin (such as polymethyl methacrylate PMMA) mixed with organi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/02G02F1/13357
Inventor 金亚东刘彬
Owner NINGBO CHANGYANG TECH
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