US 12,447,658 B2
Shut-off nozzle, injection device, and injection molding machine
Kiyotaka Nakayama, Tokyo (JP)
Assigned to THE JAPAN STEEL WORKS, LTD., Tokyo (JP)
Filed by THE JAPAN STEEL WORKS, LTD., Tokyo (JP)
Filed on Aug. 30, 2023, as Appl. No. 18/458,586.
Claims priority of application No. 2022-146437 (JP), filed on Sep. 14, 2022.
Prior Publication US 2024/0083082 A1, Mar. 14, 2024
Int. Cl. B29C 45/23 (2006.01); B29C 45/28 (2006.01); B29C 45/50 (2006.01); B29C 45/74 (2006.01)
CPC B29C 45/231 (2013.01) [B29C 45/2806 (2013.01); B29C 45/50 (2013.01); B29C 45/74 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A shut-off nozzle comprising:
a nozzle body portion having an in-nozzle flow path formed therein; and
a needle valve that is inserted into the nozzle body portion coaxially with the nozzle body portion and is configured to open and close an outlet of the in-nozzle flow path,
wherein a cylindrical portion is formed in the vicinity of a tip portion of the needle valve,
wherein a cylindrical hole portion is formed in the vicinity of a tip portion of the in-nozzle flow path, the cylindrical hole portion being a cylindrical hole,
wherein the cylindrical portion is configured to be fitted into the cylindrical hole portion in a case where the needle valve is driven in a forward direction to form a mechanical seal portion having an annular gap with a flow resistance sufficient to prevent resin flow.