US 11,919,255 B2
Method and apparatus for producing fiber-reinforced resin molding material
Tadao Samejima, Tokyo (JP); Yukihiro Mizutori, Tokyo (JP); Yasushi Watanabe, Tokyo (JP); and Junji Kanehagi, Tokyo (JP)
Assigned to Mitsubishi Chemical Corporation, Tokyo (JP)
Filed by Mitsubishi Chemical Corporation, Tokyo (JP)
Filed on Oct. 31, 2022, as Appl. No. 17/978,204.
Application 17/978,204 is a division of application No. 17/216,294, filed on Mar. 29, 2021, granted, now 11,518,116.
Application 17/216,294 is a division of application No. 15/741,615, abandoned, previously published as PCT/JP2016/070117, filed on Jul. 7, 2016.
Claims priority of application No. 2015-136084 (JP), filed on Jul. 7, 2015; and application No. 2016-078937 (JP), filed on Apr. 11, 2016.
Prior Publication US 2023/0050464 A1, Feb. 16, 2023
Int. Cl. B29C 70/00 (2006.01); B29B 11/00 (2006.01); B29B 11/02 (2006.01); B29B 15/00 (2006.01); B29B 15/12 (2006.01); B29C 70/10 (2006.01); B29C 70/42 (2006.01); B65H 35/00 (2006.01); B65H 35/08 (2006.01); D01D 11/00 (2006.01); D01D 11/02 (2006.01); B29K 31/00 (2006.01); B29K 307/04 (2006.01)
CPC B29C 70/10 (2013.01) [B29B 11/02 (2013.01); B29B 15/122 (2013.01); B29C 70/42 (2013.01); B65H 35/0086 (2013.01); B65H 35/08 (2013.01); D01D 11/02 (2013.01); B29C 2793/0081 (2013.01); B29K 2031/00 (2013.01); B29K 2307/04 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method of manufacturing a sheet-type fiber-reinforced resin molding material comprising cut fiber bundles impregnated with a resin, comprising:
producing a separated continuous fiber bundle having separated portions and unseparated portions by intermittently separating a continuous fiber bundle with a moving blade structure,
cutting the separated continuous fiber bundle at intervals in a longitudinal direction to produce cut fiber bundles, and
impregnating the cut fiber bundles with the resin to produce the sheet-type fiber-reinforced resin molding material,
wherein, in the separated continuous fiber bundle, the separated portions and the unseparated portions alternate continuously in a direction along a length of the separated continuous fiber bundle,
wherein the moving blade structure includes a spacer member positioned between a plurality of blades such that the plurality of blades are placed with a predetermined interval along a width direction of the continuous fiber bundle, and
wherein the separated continuous fiber bundle satisfies a condition specified in formula (3):
0.9≤a/(a+b)<1  (3)
wherein
“a” is a length (millimeter) of the separated portion of the separated continuous fiber bundle, and
“b” is a length (millimeter) of the unseparated portion of the separated continuous fiber bundle.