PARTIALLY SEPARATED FIBER BUNDLE AND METHOD FOR MANUFACTURING SAME, CHOPPED-FIBER BUNDLE USING SAME, AND FIBER-REINFORCED RESIN MOLDING MATERIAL

WIPO Patent Application WO/2018/143067

A1

A partially separated fiber bundle, a chopped fiber bundle using the same, and a fiber-reinforced resin molding material, in which a sizing agent including at least a polyamide resin is caused to adhere to the surface of reinforcing fibers in the partially separated fiber bundle, which is obtained by separation-processed sections separated into a plurality of bundles, and non-separation-processed sections, being alternately formed along the longitudinal direction of a reinforcing fiber bundle comprising a plurality of single yarns, the number of fibers per unit width contained in the reinforcing fiber bundle being at least 600 fibers/mm and less than 1600 fibers/mm, and the drape value of the reinforcing fiber bundle being 120-240 mm. Also, a method for manufacturing the partially separated fiber bundle, in which are performed: a fiber separation step (A) in which a fiber-separating means having a plurality of projecting parts is inserted into the fiber bundle comprising a plurality of single yarns while the fiber bundle is caused to travel in the longitudinal direction, the fiber-separating means generating a separation-processed section; an entangling step (B) for forming entangled sections in which a single yarn is intermingled with at least one section of a separation-processed section that contacts a projecting part; a partial-separation processing step (C) in which the fiber-separating means is withdrawn from a fiber bundle, and after passing through an entanglement collection section including the entangled section, is again inserted into the fiber bundle, alternately forming the separation-processed section that is separated into the plurality of bundles and the non-separation-processed section; and a resin permeation step (D) for applying a water-soluble polyamide to the fiber bundle. A partially separated fiber bundle is provided having excellent process stability in cutting processes and the like, and in which producibility is improved, while preventing inappropriate re-coagulation and the like.

FUSE MITSUKI (JP)
TATEYAMA MASARU (JP)
HIRANO HIROSHI (JP)
SEIKE SATOSHI (JP)
MATSUI AKIHIKO (JP)
URA KAZUMA (JP)
MOTOHASHI TETSUYA (JP)

PCT/JP2018/002401

August 09, 2018

January 26, 2018

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TORAY INDUSTRIES (JP)

D06M15/59; B65H51/005; D02J1/18

WO2016136812A1	2016-09-01
WO2016104154A1	2016-06-30
WO2017006989A1	2017-01-12
WO2013115337A1	2013-08-08
WO2017221658A1	2017-12-28
WO2012105080A1	2012-08-09

JP2013104156A	2013-05-30
JP2002255448A	2002-09-11
JP2004100132A	2004-04-02
JP2013049208A	2013-03-14
JP2014030913A	2014-02-20
JPS5512908B1	1980-04-04
JP2011241494A	2011-12-01
US20120213997A1	2012-08-23
EP2687356A1	2014-01-22

See also references of EP 3578711A4

BAN Toshimitsu et al. (JP)

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