US 11,813,785 B2
Extruder screw having paths within the screw, extruder, and extrusion method
Akiyoshi Kobayashi, Fuji (JP); Shigeyuki Fujii, Numazu (JP); and Takafumi Sameshima, Mishima (JP)
Assigned to Shibaura Machine Co., Ltd., Tokyo (JP)
Filed by Shibaura Machine Co., Ltd., Tokyo (JP)
Filed on Jul. 28, 2021, as Appl. No. 17/386,635.
Application 17/386,635 is a division of application No. 15/345,758, filed on Nov. 8, 2016, granted, now 11,110,638.
Application 15/345,758 is a continuation of application No. PCT/JP2015/062566, filed on Apr. 24, 2015.
Claims priority of application No. 2014-096892 (JP), filed on May 8, 2014; and application No. 2015-085953 (JP), filed on Apr. 20, 2015.
Prior Publication US 2021/0354362 A1, Nov. 18, 2021
Int. Cl. B29C 48/51 (2019.01); B29C 48/57 (2019.01); B29C 48/67 (2019.01); B29C 48/285 (2019.01); B29C 48/68 (2019.01); B29C 48/25 (2019.01); B29B 7/48 (2006.01); B29C 48/395 (2019.01); B29C 48/80 (2019.01); B29B 7/82 (2006.01); B29C 48/40 (2019.01); B29C 48/63 (2019.01); B29C 48/03 (2019.01); B29C 48/55 (2019.01); B29C 48/53 (2019.01); B29C 48/54 (2019.01); B29K 101/12 (2006.01); B29K 105/00 (2006.01)
CPC B29C 48/51 (2019.02) [B29B 7/483 (2013.01); B29B 7/488 (2013.01); B29B 7/489 (2013.01); B29C 48/2511 (2019.02); B29C 48/288 (2019.02); B29C 48/57 (2019.02); B29C 48/67 (2019.02); B29C 48/681 (2019.02); B29B 7/823 (2013.01); B29B 7/826 (2013.01); B29C 48/03 (2019.02); B29C 48/397 (2019.02); B29C 48/402 (2019.02); B29C 48/53 (2019.02); B29C 48/54 (2019.02); B29C 48/55 (2019.02); B29C 48/63 (2019.02); B29C 48/832 (2019.02); B29C 48/834 (2019.02); B29K 2101/12 (2013.01); B29K 2105/25 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A kneading method comprising:
kneading raw materials with an extruder screw comprising:
a transfer portion configured to continuously convey supplied materials,
a melt-and-mix portion configured to continuously melt and mix the conveyed materials, and
a kneading portion configured to continuously knead the raw materials obtained by melting and mixing the materials,
wherein the transfer portion, the melt-and-mix portion, and the kneading portion are provided in a screw main body configured to rotate on a straight axial line, and
a conveyance portion configured to convey the raw materials, a barrier portion configured to limit conveyance of the raw materials, and a path through which the raw materials flow are provided at places of a portion of the screw main body in which the kneading portion is provided,
wherein
the conveyance portions and the barrier portions are alternately arranged along the axial direction of the screw main body,
the paths each comprise an entrance opened in the outer circumferential surface of the screw main body to cause the raw material, the conveyance of which is limited by the barrier portions to increase pressure on the raw material, to flow in, an exit opened in the outer circumferential surface of the screw main body to allow the flowing raw material to flow out to the outer circumferential surface of the screw main body, and a path main body connecting between the entrance and the exit, and
inside at least one barrier portion and two conveyance portions adjacent to respective sides of the barrier portion,
the respective path is provided entirely through the barrier portion and extends into the two conveyance portions adjacent to the respective sides of the barrier portion,
the entrance is provided in a downstream end of one side of the two conveyance portions with respect to a conveyance direction of the conveyance portions,
the exit is provided in an upstream end of an other side of the conveyance portions with respect to a conveyance direction of the conveyance portions, and
the raw material flowing into the entrance flows towards the exit in an opposite direction to the conveyance directions of the conveyance portions; and
continuously producing and extruding the kneaded materials with the extruder screw, wherein in the kneading portion, the raw materials conveyed along the outer circumferential surface of the screw main body flow through the path and then return to the outer circumferential surface of the screw main body, while the kneaded materials are continuously extruded.