Title:
SHORT FIBER-REINFORCED PREPREG SHEET AND METHOD FOR PRODUCING SHORT FIBER-REINFORCED PREPREG SHEET
Document Type and Number:
WIPO Patent Application WO/2022/202981
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a short fiber-reinforced prepreg sheet wherein: the weight per square meter in an end part of the short fiber-reinforced prepreg sheet is controlled; the variation of the weight per square meter in the sheet width direction is small; and the loss width with respect to the product width is small. In order to achieve the above-described purpose, a short fiber-reinforced prepreg sheet according to the present invention comprises a matrix resin and chopped fiber bundles, and the variation coefficient CVa of the weight per square meter of the full width of this short fiber-reinforced prepreg sheet in the width direction is 15% or less. With respect to this short fiber-reinforced prepreg sheet, a rectangular region that has a specific length Lb (mm) in the width direction, while having a length of 200 mm in the longitudinal direction is arranged on the inner side of this short fiber-reinforced prepreg sheet in such a manner that the long sides of the rectangular region are superposed on boundary lines that are set at ((average bundle length of chopped fiber bundles)/2) mm inside from the edges of this short fiber-reinforced prepreg sheet in the width direction; and the weight per square meter of the rectangular region is from 80% to 105% of the average weight per square meter of the full width of this short fiber-reinforced prepreg sheet in the width direction.
Inventors:
YAMANAKA YUSUKE (JP)
HASHIMOTO TAKAFUMI (JP)
ONO YASUKAZU (JP)
WATANABE TADASHI (JP)
HASHIMOTO TAKAFUMI (JP)
ONO YASUKAZU (JP)
WATANABE TADASHI (JP)
Application Number:
PCT/JP2022/013893
Publication Date:
September 29, 2022
Filing Date:
March 24, 2022
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
B29B11/16; B29C70/18; B29C70/28; C08J5/04; D04H1/732; D04H13/00
Domestic Patent References:
| WO2020090877A1 | 2020-05-07 |
Foreign References:
| JP2019039124A | 2019-03-14 | |||
| JP2010235779A | 2010-10-21 | |||
| CN207736777U | 2018-08-17 | |||
| JP2013202969A | 2013-10-07 | |||
| JP2013028062A | 2013-02-07 | |||
| JP2014210991A | 2014-11-13 | |||
| JP2019039124A | 2019-03-14 | |||
| JP5822033B2 | 2015-11-24 |
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