US 12,434,418 B2
Die lip opening/closing device
Yoshihiro Yamasaki, Yamato (JP); Shuji Ito, Yamato (JP); and Tadatoshi Tanji, Yamato (JP)
Assigned to KYORAKU CO., LTD., Kyoto (JP)
Appl. No. 18/560,762
Filed by KYORAKU CO., LTD., Kyoto (JP)
PCT Filed Mar. 30, 2022, PCT No. PCT/JP2022/016327
§ 371(c)(1), (2) Date Nov. 14, 2023,
PCT Pub. No. WO2022/244524, PCT Pub. Date Nov. 24, 2022.
Claims priority of application No. 2021-086451 (JP), filed on May 21, 2021.
Prior Publication US 2024/0246278 A1, Jul. 25, 2024
Int. Cl. B29C 48/31 (2019.01)
CPC B29C 48/313 (2019.02) 6 Claims
OG exemplary drawing
 
1. A resin feeder comprising an extruder, an accumulator, and a T-die, wherein
the T-die comprises a die lip and a die lip opening/closing device comprising:
an opening/closing structure configured to open and close a die lip of a T-die in response to a linear motion of a pusher; and
an actuator configured to actuate the pusher to move linearly,
wherein the pusher comprises a plurality of sub-pushers disposed along a longitudinal direction of the die lip, and
the actuator is provided for each of the sub-pushers, wherein
the accumulator is configured to be filled with resin melted and kneaded in the extruder,
the T-die is configured to be filled with the resin filling the accumulator,
and configured that during the filling of the T-die with molten resin, the die lip is closed,
and configured that when the T-die is sufficiently filled with the molten resin required for molding, the die lip opening/closing device is configured to open the die lip, and a molten resin sheet is extruded through a slit of the die lip, wherein
each of the sub-pushers is provided with a pusher-bar,
a pusher head is provided at an end portion of the pusher bar,
the opening/closing structure comprises a receiving piece and a die lip piece,
the die lip piece comprises a bending portion formed into a thin wall with a block cut out, a receiving piece connection to which the receiving piece is attached, and a fixing portion fixed to a body of the T-die,
the receiving piece connection and the fixing portion are connected by the bending portion, and
the pusher head is configured to press the receiving piece connection through the receiving piece.