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Method for cleaning drum in production process of cellulose ester thin film

A production process, cellulose ester technology, applied in the field of drum cleaning in the production of cellulose ester film, can solve the problems of deterioration of plasticizer condensation on the drum surface, change of product thickness uniformity, and exacerbation of plasticizer precipitation, etc. Achieve the effects of protection from damage, improvement of film quality, and prevention of micro-vibration

Active Publication Date: 2012-07-11
乐凯光电材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, with the rapid development of the liquid crystal display industry, the demand for cellulose ester films is increasing, and manufacturers need to increase production speed to increase production capacity. The coagulation condition of the plasticizer deteriorates, and the previous methods cannot thoroughly clean the condensed plasticizer on the surface of the drum, which pollutes the back of the cast steel strip and produces irregular stripes, resulting in micro-vibration of the cast steel strip. On the one hand, it causes changes in the uniformity of product thickness. , which reduces the quality of the film; on the other hand, it needs to stop for cleaning, which shortens the production cycle and increases the cost

Method used

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  • Method for cleaning drum in production process of cellulose ester thin film
  • Method for cleaning drum in production process of cellulose ester thin film
  • Method for cleaning drum in production process of cellulose ester thin film

Examples

Experimental program
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Embodiment 1

[0037] In the present invention, cellulose triacetate is used as a film-forming material to prepare cotton gum solution, and the addition ratio of plasticizer in the solution is 17% of the weight of cellulose triacetate. A liquid film 5 is formed on the endless cast steel strip 2, and the liquid film 5 is peeled off from the endless cast steel strip 2 after drying, then stretched, dried and finally wound on the winding roller. In order to meet the needs of production, The production speed is 15 m / min.

[0038] In the film production process, in order to thoroughly clean the foreign matter on the surface of the front drum, a spray device 7 is installed 5 cm above the drum scraper 6 on the front drum 3, and the angle between the nozzle 10 and the drum surface of the front drum 3 is adjusted to make the wet surface width of the spray liquid The control spray volume is 1L / min, the spray pressure is 1.5bar, the solvent used is a mixed solution of dichloromethane and methanol (volum...

Embodiment 2

[0040] The film production process is the same as in Example 1, and the production speed is 25 m / min to meet the needs of production. The spray device 7 is located at 10 cm above the drum scraper 6, forming a spray liquid wet surface width of 15 cm, controlling the spray volume to be 1.5 L / min, and the spray pressure 1.0 bar. The solvent used is methylene chloride solution, and the spray device adopts polytetrafluoroethylene material , The spray works intermittently, the spray time is set for 5 seconds, and the interval is 20 seconds.

Embodiment 3

[0042] The film production process is the same as in Example 1, and the production speed is 30 m / min to meet the needs of production. The spraying device 7 is located 70 cm above the drum scraper 6, forming a wet spray surface with a width of 45 cm, controlling the spray volume at 1.5 L / min, and the spray pressure at 2 bar. The solvent used is a mixed solution of methyl acetate and methanol (volume ratio (1 : 1), the spray device 7 is made of metal titanium, and the spraying adopts intermittent working mode, the spraying time is set to 20 seconds, and the interval is 100 seconds.

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Abstract

The invention provides a method for cleaning a drum in a production process of a cellulose ester thin film. A spraying device is arranged above a drum scraper and at a part which is 5-80 cm far away from the drum scraper. The method is carried out by the following steps of: a, spraying a solvent on the surface of the drum through the spraying device to form a spraying moist surface; b, rotating the spraying moist surface to the position of the drum scraper along the rotation of the drum and scraping off substances on the surface of the drum by the drum scraper; and c, putting the scraped substances into a liquid collecting disc and periodically cleaning the liquid collecting disc. According to the method disclosed by the invention, a plasticizer collected on the surface of the drum can be effectively cleaned and the cleanness of the surface of the drum can be still kept under the conditions of production at a high vehicle speed and in a long period.

Description

technical field [0001] The invention relates to the field of optical films, in particular to a cleaning method for drums in the production of cellulose ester films. Background technique [0002] A cellulose ester film is generally produced by a solution casting film-forming method. That is, a high-viscosity solution is prepared by using cellulose ester and mixed solvent as raw materials and supplemented with plasticizer, ultraviolet absorber, antistatic agent, etc. as additives, and the solution is cast from a die to an annular cast steel belt to form a liquid film The liquid film turns into a wet film with the casting steel belt for about one revolution, and the wet film is peeled off and dried to obtain a cellulose ester film. [0003] In the actual film production process, a large amount of solvent evaporates from the surface of the liquid film from the beginning of casting the solution into a liquid film until it is peeled off from the steel strip. Since the plasticizer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B1/02C08J5/18B08B1/20
Inventor 乔素琴张少杰陈月霞李兰周
Owner 乐凯光电材料有限公司
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