US 12,296,506 B2
Resin cutter, granulator and pellet manufacturing method
Tetsuya Koiwa, Tokyo (JP); Hiroyuki Kawano, Tokyo (JP); Makoto Ishikawa, Tokyo (JP); Soichiro Matsuda, Tokyo (JP); and Mutsushi Harawaki, Tokyo (JP)
Assigned to THE JAPAN STEEL WORKS, LTD., Tokyo (JP)
Appl. No. 18/034,168
Filed by THE JAPAN STEEL WORKS, LTD., Tokyo (JP)
PCT Filed May 27, 2021, PCT No. PCT/JP2021/020295
§ 371(c)(1), (2) Date Apr. 27, 2023,
PCT Pub. No. WO2022/091468, PCT Pub. Date May 5, 2022.
Claims priority of application No. 2020-180994 (JP), filed on Oct. 29, 2020.
Prior Publication US 2023/0382013 A1, Nov. 30, 2023
Int. Cl. B29B 9/06 (2006.01)
CPC B29B 9/06 (2013.01) 11 Claims
OG exemplary drawing
 
1. A resin cutter comprising:
a die formed on a resin discharge side of an extruder kneading and extruding a resin;
a plurality of nozzles provided in the die;
a plurality of cutter blades cutting the resin to form a pellet, the resin being discharged from the plurality of nozzles;
a cutter head including the plurality of cutter blades arranged therein;
a rotation shaft attached to the cutter head;
a motor rotating the rotation shaft;
a closed chamber configuring a closed gap in contact with the cutter head;
an inflow port through which fluid flows into the closed chamber;
an outflow port through which the fluid and the pellet flow out of the closed chamber;
a controller configured to control a cutter-blade pressing force for pressing the plurality of cutter blades onto the die;
a rotation-shaft forward force generator generating a rotation-shaft forward force on the rotation shaft; and
a rotation-shaft backward force generator generating a rotation-shaft backward force on the rotation shaft,
wherein the controller includes:
a revolution-number controller configured to control a revolution number of the rotation shaft;
a rotation-shaft forward force controller configured to control a magnitude of the rotation-shaft forward force; and
a rotation-shaft backward force controller configured to control a magnitude of the rotation-shaft backward force, and
the controller is configured to variably control each of the revolution number of the rotation shaft, the magnitude of the rotation-shaft forward force and the magnitude of the rotation-shaft backward force so that the cutter-blade pressing force is constant.