Preparation method of brightened optical film

Abstract

The invention relates to the technical field of optical films, in particular to a preparation method of a brightened optical film. The preparation method is characterized by comprising the following technological steps: stretching a raw coiled material driven by a motor to operate, stripping a protective film to expose a substrate, sending the substrate to a scraper-type coater to coat an opticalfilm material; then, carrying out infrared predrying in a dryer with an additional infrared lamp under the conditions that the infrared illumination power is 1000 mJ, the predrying time is 5-10s, andthe ventilation rate in drying is 30m<3> / min; adopting a rubber embossing roller to emboss in an embossing device, adopting a UV lamp with the power of 600-800 mJ to dry and shape; pasting a transparent protective film; and coiling. Compared with the prior art, the invention has strong suitability by adopting a cutting tool of the scraper-type coater, greatly improves the product-curing effect because a large wrapping angle is formed between the substrate and the output end of the embossing roller and saves energy; embossing and UV shaping are simultaneously carried out so that patterns on the substrate surface are difficult to deform.

Description

[Technical Field] [0001] The invention relates to the technical field of optical films, in particular to a method for preparing a brightness enhancement optical film. [Background technique] [0002] With the development of optoelectronic technology, the application of optical films is becoming more and more indispensable, especially for LCD optical films. Optical films have always been the key components of LCD backlight modules, and the main optical films of backlight modules The function is to increase the angular brightness of the target range, improve the efficiency of the light source, and improve the uniformity of the module. [0003] At present, the process of preparing optical film in the industry is mainly coating first, then embossing, then UV setting, and finally putting on the protective film and then winding. Since the substrates used in the preparation of optical films generally contain volatiles, the process of direct embossing after coating is likely to cause bubbl...

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Problems solved by technology

Since the base materials used in the preparation of optical films generally contain volatile components, the process of direct embossing after coating is easy to cause bubbles and cavities in the embossed film; and this process is very important for coating The requirements for the glue used are very high, because during the embossing setting process, the volatile components in the glue volatilize under the irradiation of UV light, and then cool on the embossing roller to form liquid-stained spots, which affect the embossing effect; After the glue is in a liquid state, in the uneven longitudinal tension generated in the gravity, material surface tension and curling mechanical tension control system, it is easy to produce uneven longitudinal coating thickness, and it is easy to cause product embossing not full in the subsequent embossing process Phenomenon

[0004] In addition, in the existing process of preparing optical film, the coating generally adopts spin coating method, slit coating method, vertical flow method, etc., among which spin coating method is easy to produce longitudinal zebra pattern and affects the fullness of embossing; while slit coating method The fabric method is difficult to meet the requirements of medium and large format coating, and has poor adaptability to different glues, and must add WRRM additives to reduce the viscosity of the coating, which will affect the quality of the final product; vertical flow coating also needs to add WRRM

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