US 12,427,706 B2
Die, method of manufacturing die, extrusion apparatus, and method of manufacturing pellets
Naoki Ueda, Tokyo (JP); Tomonori Hashimoto, Tokyo (JP); Hiroyuki Kawano, Tokyo (JP); Soichiro Matsuda, Tokyo (JP); and Fumiya Yamabe, Tokyo (JP)
Assigned to THE JAPAN STEEL WORKS, LTD., Tokyo (JP)
Appl. No. 18/282,187
Filed by THE JAPAN STEEL WORKS, LTD., Tokyo (JP)
PCT Filed Nov. 1, 2021, PCT No. PCT/JP2021/040304
§ 371(c)(1), (2) Date Sep. 14, 2023,
PCT Pub. No. WO2022/201618, PCT Pub. Date Sep. 29, 2022.
Claims priority of application No. 2021-052668 (JP), filed on Mar. 26, 2021.
Prior Publication US 2024/0157623 A1, May 16, 2024
Int. Cl. B29C 48/30 (2019.01); B29B 9/06 (2006.01); B29C 48/00 (2019.01); B33Y 10/00 (2015.01); B33Y 80/00 (2015.01)
CPC B29C 48/3001 (2019.02) [B29B 9/065 (2013.01); B29C 48/0022 (2019.02); B33Y 10/00 (2014.12); B33Y 80/00 (2014.12)] 26 Claims
OG exemplary drawing
 
1. A die having an extrusion surface and an injection surface on an opposite side of the extrusion surface, the die comprising:
a first member made of a first metal material;
an injection hole formed from a surface of the first member on a side of the injection surface to an inside of the first member;
a plurality of nozzles formed from a surface of the first member on a side of the extrusion surface to the inside of the first member and connected to the injection hole;
a heat source provided inside the first member; and
a plurality of first heat insulating portions provided inside the first member,
wherein the plurality of first heat insulating portions extend from an outer peripheral side of the first member toward an inner side of the first member in plan view, and
a cross-sectional shape of each of the plurality of first heat insulating portions is such that an interval between the first heat insulating portions adjacent to each other gradually increases as approaching from the side of the extrusion surface toward the side of the injection surface.