US 12,459,187 B2
Extruder and method of manufacturing resin product
Kazuya Yokomizo, Tokyo (JP); and Yohei Fukuzawa, Tokyo (JP)
Assigned to THE JAPAN STEEL WORKS, LTD., Tokyo (JP)
Appl. No. 18/272,586
Filed by THE JAPAN STEEL WORKS, LTD., Tokyo (JP)
PCT Filed Oct. 13, 2021, PCT No. PCT/JP2021/037885
§ 371(c)(1), (2) Date Jul. 16, 2023,
PCT Pub. No. WO2022/168373, PCT Pub. Date Aug. 11, 2022.
Claims priority of application No. 2021-014742 (JP), filed on Feb. 2, 2021.
Prior Publication US 2024/0116235 A1, Apr. 11, 2024
Int. Cl. B29C 48/92 (2019.01); B29C 48/68 (2019.01); B29C 48/69 (2019.01); B29C 48/695 (2019.01)
CPC B29C 48/92 (2019.02) [B29C 48/68 (2019.02); B29C 48/69 (2019.02); B29C 48/695 (2019.02); B29C 2948/92019 (2019.02); B29C 2948/922 (2019.02); B29C 2948/924 (2019.02); B29C 2948/92409 (2019.02)] 11 Claims
OG exemplary drawing
 
1. An extruder comprising:
a cylinder;
a die attached to the cylinder;
a resin flow path portion which is provided in the die and to which a molten resin is supplied from the cylinder;
a plurality of holes which are provided in the die and connected to the resin flow path portion and from which the molten resin is discharged;
a pressure measurement unit configured to measure a pressure of the molten resin in the die; and
a calculation unit configured to calculate a viscosity of the molten resin based on a measured value of the pressure measurement unit,
wherein the die includes a die main body portion in which the plurality of holes are formed and a die holder portion configured to hold the die main body portion,
wherein the resin flow path portion is formed across the die holder portion and the die main body portion,
wherein the pressure measurement unit is arranged in the die main body portion and measures the pressure of the molten resin flowing through the resin flow path portion in the die main body portion, and
wherein resin pellets are manufactured by using the molten resin discharged from the plurality of holes.