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Film stretching device and manufacturing method of retardation film

A stretching device and film technology, applied in the field of film stretching device and retardation film manufacturing, can solve problems such as breakage, and achieve the effect of restraining breakage and reducing stress concentration

Active Publication Date: 2022-05-24
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such oblique stretching techniques, as the stretching ratio increases, the film may break starting from the periphery of the clips holding the film.

Method used

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  • Film stretching device and manufacturing method of retardation film
  • Film stretching device and manufacturing method of retardation film
  • Film stretching device and manufacturing method of retardation film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0157] (Production of polyester carbonate resin film)

[0158] The polymerization was carried out using a batch polymerization apparatus consisting of two vertical reactors each including a stirring blade and a reflux cooler controlled at 100°C. 29.60 parts by mass (0.046 mol) of bis(9-(2-phenoxycarbonyl ethyl))fluorene-9-yl)methane, 29.21 parts by mass (0.200 mol) of ISB, 42.28 parts by mass were put (0.139 mol) of SPG, 63.77 parts by mass (0.298 mol) of DPC, and 1.19×10 as a catalyst －2 parts by mass (6.78×10 －5 mol) of calcium acetate monohydrate. After the inside of the reactor was depressurized and replaced with nitrogen, it was heated with a heating medium, and stirring was started when the internal temperature reached 100°C. 40 minutes after the start of temperature increase, the internal temperature was brought to 220°C, and the pressure in the reactor was brought to 13.3 kPa within 90 minutes after the temperature reached 220°C while the pressure reduction was star...

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Abstract

The present invention relates to a clip-type film stretching device capable of suppressing breakage of a film starting from the peripheral edge of a clip. This clamp-type film stretching device has left and right clamps of a variable-pitch type that hold the left and right ends of the film to be stretched and pass through the stretching zone. Furthermore, the clamp spacing in the longitudinal direction of at least one side clamp is changed, wherein the clamp has an upper holding member and a lower holding member, and the upper holding member and the lower holding member clamp and hold the end of the film, the The bottom surface of the upper holding member and the upper surface of the lower holding member are configured to be rotatable about an axis perpendicular to the main surface of the film.

Description

technical field [0001] The present invention relates to a film stretching apparatus and a method for producing a retardation film. Background technique [0002] In image display devices such as a liquid crystal display device (LCD) and an organic electroluminescence display device (OLED), a circularly polarizing plate is used for the purpose of improving display characteristics and antireflection. Typically, the circularly polarizing plate is formed by laminating a polarizing plate and a retardation film (typically a λ / 4 plate) such that the absorption axis of the polarizing plate and the retardation axis of the retardation film form an angle of 45° . Conventionally, the retardation film is typically produced by uniaxial stretching or biaxial stretching in the longitudinal and / or transverse directions. Therefore, in many cases, the retardation axis of the retardation film is in the transverse direction (width direction) of the original film. ) or portrait (longitudinal). ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C55/20
CPCB29C55/20
Inventor 清水享千田裕树山本真士
Owner NITTO DENKO CORP