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Method for producing longitudinally-stretching film

A manufacturing method and technology of stretched film, applied in the field of manufacturing long stretched film, can solve the problems of axis deviation, uneven color, uneven axis, etc.

Active Publication Date: 2015-07-08
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there are problems in that unnecessary parts are generated on the membrane, resulting in a decrease in utilization efficiency and an increase in production cost.
In addition, since at least one of the elongated polarizer and retardation film (stretched film) is attached as a film sheet, there is a problem that their axes deviate from the desired angle during attachment, resulting in Axial unevenness
[0011] However, according to the research of the present inventors, if the elongated stretched film produced using the linear oblique stretching device described in Patent Document 2 is used for organic electroluminescence ( Organic EL) display devices sometimes produce color unevenness

Method used

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  • Method for producing longitudinally-stretching film
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  • Method for producing longitudinally-stretching film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0348] The obtained polycarbonate film (long film A: film thickness 90 μm) was obliquely stretched under the conditions of the production method according to the present embodiment. Thus, the elongated stretched film related to Example 1 was obtained. Then, the obtained elongated stretched film was wound up into a roll.

[0349] Specifically, oblique stretching was performed under the following conditions.

[0350] First, use Figure 4 The shown oblique stretching device T obliquely stretches the long film. The conveying speed of the long film was 5 m / min. The grip C1 (first grip) is accelerated from P1 to P2, whereby the grip C1 is made to precede the grip C2 (second grip). In addition, the gripper C2 is accelerated from P3 to P4, and the elongated stretched film is released when the gripper C1 and the gripper C2 are set at constant speeds. Thereafter, it was wound up into a roll with a pulling tension of 200 (N / m) by a winding device installed at the exit.

[0351] Usi...

Embodiment 2

[0355] In the stretching zone, the temperature of the hot air blown in the stretching zone, the air volume, etc. in the stretching zone are adjusted so that the end portion of the leading side of the elongated film behind the holding member C1 is 32°C higher than the film central portion. Heating conditions were the same as in Example 1 except for this.

Embodiment 3

[0357] In the stretching region, it is the same as in Example 1 except that intermittent heating such as hot air applied to the end portion on the front end side of the long film is applied only to the region between adjacent first grippers.

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Abstract

One aspect of the present invention is a method for producing a longitudinally-stretching film equipped at least with a diagonal-stretching step for angling the optical axis of the longitudinal film by gripping both ends of a thermoplastic longitudinal film using a plurality of gripping tools, and conveying the gripping tools gripping both ends at a constant speed, then accelerating first gripping tools gripping one end faster than second gripping tool gripping the other end, and advancing the first gripping tools farther than the second gripping tools, the method for producing the longitudinally-stretching film being characterized in that after advancing the first gripping tools in the diagonal-stretching step, a relaxing treatment is performed for relaxing the distortional stress applied to the longitudinal film in the regions between adjacent first gripping tools.

Description

technical field [0001] The present invention relates to a method for producing a long stretched film. Background technique [0002] A stretched film obtained by stretching a resin film is used as an optical film that performs various optical functions in various display devices by utilizing its optical anisotropy. For example, it is known that a stretched film is used as an optical compensation film for optical compensation such as coloring prevention and widening of the viewing angle in image display devices such as liquid crystal display devices. Moreover, the circular polarizing plate which used the stretched film as the retardation film which also serves as a polarizer protective film is known by bonding a stretched film and a polarizer (polarizing film). [0003] Depending on the image display device used, such a circularly polarizing plate may need to be bonded in an arrangement in which the optical axis such as the in-plane slow axis of the stretched film is inclined...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/04
CPCB29C55/045
Inventor 畠山晋平
Owner KONICA MINOLTA INC
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