Method of manufacturing phase difference film and phase difference film roll

A technology of retardation film and manufacturing method, which is applied to flat products, instruments, polarizing elements, etc., can solve problems such as cracks, defects, and diaphragm ruptures, so as to reduce adverse effects, improve area use efficiency, and realize field of view angle. Effects of Features
CN103052489BActive Publication Date: 2015-03-11NIPPON SHOKUBAI CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NIPPON SHOKUBAI CO LTD
Publication Date
2015-03-11

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Abstract

One of the methods of manufacturing a phase difference film of the present invention provides a strip-shaped phase difference film which has a delayed phase axis that is inclined with respect to the longitudinal direction, an NZ coefficient closer to 1 than conventional values, and a weak biaxial stretchability (has strong uniaxial stretchability). In the manufacturing method is used a pair of clip sets that grip both peripheral edge parts of the strip-shaped raw film, and a heating and stretching apparatus having a stretching zone. At the time the clip sets grip the raw film, the traveling speed of the pair of clip sets is the same. The stretching zone has a first segment in which the traveling speed of one of the clip sets that have traveled into the zone is successively reduced, and after the first segment, a second segment in which the traveling speed of the above one of the clip sets that have traveled via the first segment is successively restored.
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Description

technical field

[0001] The present invention relates to a method for producing a retardation film, and in particular, to a method for producing a retardation film suitable for use in image display devices such as liquid crystal display devices (LCD) and organic electroluminescent (EL) display devices. Moreover, this invention relates to the retardation film roll which wound the retardation film of belt shape. Background technique

[0002] In recent years, liquid crystal display devices (LCDs) have become larger in size, and the environment in which they are used is expanding. Based on these circumstances, there is a strong demand for improvement in the visibility of LCDs. However, the demand for improved visibility cannot be fully satisfied by merely improving the liquid crystal cell itself. For the improvement of the visibility of an image display device, the performance improvement of the optical film with which this device is equipped, such as a retardation film, contri...

Claims

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