US 11,992,973 B2
Kneading method for fiber-reinforced thermoplastic resin, plasticizing device, and extruding machine
Akira Yasue, Hiroshima (JP); Hideki Chiba, Hiroshima (JP); Daisuke Kunihiro, Hiroshima (JP); Shoso Nishida, Hiroshima (JP); Kazuya Tsuji, Hiroshima (JP); Yasufumi Fujita, Hiroshima (JP); Kazuki Fujita, Hiroshima (JP); and Yukihiro Sumihiro, Hiroshima (JP)
Assigned to THE JAPAN STEEL WORKS, LTD., Tokyo (JP)
Appl. No. 16/650,784
Filed by THE JAPAN STEEL WORKS, LTD., Tokyo (JP)
PCT Filed Sep. 26, 2018, PCT No. PCT/JP2018/035815
§ 371(c)(1), (2) Date Mar. 25, 2020,
PCT Pub. No. WO2019/065786, PCT Pub. Date Apr. 4, 2019.
Claims priority of application No. 2017-184641 (JP), filed on Sep. 26, 2017; and application No. 2017-195576 (JP), filed on Oct. 6, 2017.
Prior Publication US 2021/0197420 A1, Jul. 1, 2021
Int. Cl. B29B 7/90 (2006.01); B29B 7/00 (2006.01); B29B 7/48 (2006.01); B29B 7/60 (2006.01); B29C 48/00 (2019.01); B29C 48/16 (2019.01); B29C 48/285 (2019.01); B29C 48/40 (2019.01); B29K 101/12 (2006.01); B29K 105/12 (2006.01)
CPC B29B 7/482 (2013.01) [B29B 7/007 (2013.01); B29B 7/489 (2013.01); B29B 7/603 (2013.01); B29B 7/905 (2013.01); B29C 48/0022 (2019.02); B29C 48/16 (2019.02); B29C 48/2886 (2019.02); B29C 48/297 (2019.02); B29C 48/40 (2019.02); B29C 48/0011 (2019.02); B29K 2101/12 (2013.01); B29K 2105/12 (2013.01)] 10 Claims
OG exemplary drawing
 
4. A fiber-reinforced thermoplastic resin extruder, which is a twin screw extruder comprising:
a cylinder having a bore, the bore having a cross-sectional shape in which two circles of a same size are partially overlapped with each other by intersecting at two points, thereby forming inward barrel chips at two locations; and
two screws rotatably inserted into the bore,
wherein a thermoplastic resin is supplied to the cylinder and melted while reinforcing fibers are supplied, the thermoplastic resin and the reinforcing fibers are kneaded to obtain a fiber-reinforced thermoplastic resin, and the obtained fiber-reinforced thermoplastic resin is extruded by the extruder,
wherein the cylinder includes a reinforcing fiber inlet, to which the reinforcing fibers are supplied, at a predetermined position in the cylinder, and
wherein the bore has a shape in which:
at a first position that is downstream of a thermoplastic resin supply and upstream of the reinforcing fiber inlet, the barrel chips are formed at two locations; and
from a second position that is downstream and immediately adjacent to the first position to a third position that is downstream of the reinforcing fiber inlet, at least one of the barrel chips is cut, the second position being upstream of the at least one of the reinforcing fiber inlets;
wherein the bore from the second position to the third position has a larger cross-sectional area than the bore at the first position.