Method for stretching polymer film and device for recovering slit film edge

A technology of polymer film and recycling equipment, which is applied in metal processing and other fields, and can solve the problems of reducing the quality of TAC film

Inactive Publication Date: 2008-10-01
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mixing of connecting bands reduces the quality of recycled TAC membranes

Method used

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  • Method for stretching polymer film and device for recovering slit film edge
  • Method for stretching polymer film and device for recovering slit film edge
  • Method for stretching polymer film and device for recovering slit film edge

Examples

Experimental program
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Embodiment Construction

[0020] As shown in FIG. 1 , an offline stretching apparatus 2 is used to stretch a TAC film 3 , and is equipped with a supply chamber 4 , a tenter 5 , a stress relaxation chamber 6 using heating, a cooling chamber 7 , and a winding chamber 8 . The supply chamber 4 stores the TAC film 3 in roll form that has been produced in the solution casting line. The TAC film 3 is supplied to the tenter 5 through the supply roll 9 .

[0021] In the tenter 5, both sides of the TAC film 3 are held by clips 15 (see FIG. 2). While conveyed in this state, the TAC film 3 is heated and stretched in the film width direction B (see FIG. 2 ). The TAC film 3 is preferably stretched in the film width direction B by 100.5% to 300% relative to the width of the TAC film 3 before stretching.

[0022] The reservoir 10 is provided between the supply chamber 4 and the tenter 5 . In the reservoir 10, a certain length of the TAC film 3 remains to form a ring. The certain length is a length sufficient to co...

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Abstract

A rear end portion of a leading TAC film and a front end portion of a following TAC film are connected using a double-sided adhesive tape and a single-sided adhesive tape. Both side edges of the TAC films are slit with cutters of an edge slitting device. The slit side edges are sent to a cutter blower. In the cutter blower, the slit side edges are cut into small pieces and sent to a crusher through a first pipe. Upon receiving a tape detection signal, a plate controller rotates a plate from a close position to an open position. When the plate is in the open position, the cut films are sent from the first pipe to a second pipe via an opening, and then to a receptacle.

Description

technical field [0001] The present invention relates to a method for stretching a polymer film and a device for recovering edges that have been cut from said film. Background technique [0002] In recent years, liquid crystal displays have been rapidly developed and spread. This trend has resulted in increased demand for cellulose acylate films, especially triacetyl cellulose (TAC) films used as protective films for liquid crystal displays. As demand increases, there is a need to increase the production capacity of TAC membranes. TAC membranes are often produced according to the following method. First, a dope including TAC and a solvent is cast onto a continuously running support using a casting die to form a cast film. The cast film is dried or cooled to develop its self-supporting properties. After having acquired the self-supporting properties, the cast film was peeled from the support, then dried and rolled into a TAC film. According to such a solution casting meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/08B26D7/18
CPCB29C55/08B29K2001/00B29C71/02B29C2071/022
Inventor 青岛伸介
Owner FUJIFILM CORP
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