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Preparation method for cellulose ester films

A technology of cellulose ester and cellulose triacetate, which is applied in the field of adding adhesive tape to the shaft core to eliminate the indentation and gap marks of the shaft core. It can solve the problems of unusable, uneven, and gap marks, and improve the finished product rate effect

Active Publication Date: 2015-10-28
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

Since the thickness of the cellulose ester film is between 156um and 164um, the surface is smooth, and it is easy to become uneven due to external pressure. On the shafted product obtained by the existing winding method, the performance is: after a period of time, the shaft core Within the length of about 15m on the innermost side, due to the unevenness of the surface of the shaft core, the cellulose ester film will be indented and printed, making it unusable

Method used

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  • Preparation method for cellulose ester films
  • Preparation method for cellulose ester films
  • Preparation method for cellulose ester films

Examples

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Effect test

preparation example Construction

[0018] The preparation method of cellulose ester film is:

[0019] 1. Preparation of cellulose triacetate cotton glue solution

[0020] The process of preparing the cellulose triacetate cotton glue solution includes four steps: feeding, mixing and dissolving, filtering the cotton glue solution and standing at constant temperature for defoaming.

[0021] (1) Feeding

[0022] Pour the mixed solvent into the mixer, turn on the stirring and jacket water of the mixer, control the steady speed, slowly add the cellulose triacetate into the mixer, and add the plasticizer and auxiliary additives after the feeding is completed.

[0023] (2) Mix and dissolve

[0024] Adjust the stirring speed, jacket water temperature and other dissolution processes to dissolve the cellulose triacetate for 8 hours to prepare a uniform cellulose triacetate cotton glue solution.

[0025] (3) Filtration of cotton glue solution

[0026] In order to remove the mechanical impurities and insoluble matter in...

Embodiment 1

[0045] The preparation process of cellulose ester film 6: the preparation of cellulose triacetate cotton gum solution, casting, drying, slicing edge, embossing edge, winding on the core 5, before the start of winding, the corresponding fibers on the core 5 The wrapping tape 7 at the embossed position at both ends of the plain ester film 6 has a length of 1.0 m, a width of 0.5 cm, and a thickness of 0.05 mm. Afterwards, the cellulose ester film 6 is embossed and placed on the adhesive tapes 7 at both ends, and starts to be rolled until it is rolled into a full shaft. The indentation and hole printing were detected, and the results are shown in Table 1.

Embodiment 2

[0047] With reference to the preparation method of Example 1, the difference is that before the winding starts, the adhesive tape 7 is spirally wound at the width corresponding to the cellulose ester film 6 in the horizontal direction of the winding shaft core 5, and then the cellulose ester film 6 is rolled on the tape 7. On the shaft core 5, start to roll until it is rolled into a full shaft. The width of the adhesive tape 7 is 1cm, and the thickness is 0.15mm. The indentation and hole printing were detected, and the results are shown in Table 1.

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Abstract

A preparation method for cellulose ester films comprises the steps of preparation and tape casting of cellulose triacetate collodion, drying, edge slicing, edge embossing, and winding on a central spindle. After improvement, when a cellulose ester film starts to be wound, adhesive tape is added to the embossed parts of the two ends, and the length of the adhesive tape is one to four times the perimeter of the central spindle. By means of the preparation method, the indentation and concave-convex phenomena on the part, close to the inner side of the central spindle, of the cellulose ester film are eliminated, and the yield is improved.

Description

technical field [0001] The invention relates to a preparation method of a cellulose ester film, in particular to a method for adding an adhesive tape to a shaft core so as to eliminate the indentation and scratching of the shaft core. Background technique [0002] The cellulose ester film is made of partially hydrolyzed cellulose triacetate as a raw material, dissolved in a mixed solvent to prepare a cotton glue solution, and the film is made by casting method, and the prepared cellulose ester film is stored in rolls. The finished film is widely used in the support body and protective film of polarizer because of its excellent optical and physical properties. [0003] The rolling method of the cellulose ester film is that when winding into a shaft, the cellulose ester film is directly wound on the shaft core made of pipes made of different materials until the winding length requirement is reached. In order to improve the flatness of the whole roll of cellulose ester film an...

Claims

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Application Information

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IPC IPC(8): B29D7/01C08J5/18C08L1/12
Inventor 张淑静王秋玲张占胜尤杰
Owner 乐凯光电材料有限公司
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