US 12,030,223 B2
Strand manufacturing apparatus and pellet manufacturing apparatus
Yohei Fukuzawa, Tokyo (JP); Yusuke Fukushi, Tokyo (JP); and Hideki Tomiyama, Tokyo (JP)
Assigned to THE JAPAN STEEL WORKS, LTD., Tokyo (JP)
Filed by THE JAPAN STEEL WORKS, LTD., Tokyo (JP)
Filed on Oct. 7, 2020, as Appl. No. 17/065,502.
Claims priority of application No. 2019-191188 (JP), filed on Oct. 18, 2019.
Prior Publication US 2021/0114259 A1, Apr. 22, 2021
Int. Cl. B29B 9/06 (2006.01); B29C 48/05 (2019.01); B29C 48/255 (2019.01); B29C 48/92 (2019.01)
CPC B29B 9/065 (2013.01) [B29C 48/05 (2019.02); B29C 48/255 (2019.02); B29C 48/92 (2019.02)] 6 Claims
OG exemplary drawing
 
1. A strand manufacturing apparatus comprising:
a die in which a plurality of outflow holes for discharging a molten resin material as string-shaped resin strands are formed;
an adjustment valve configured to adjust openings of the outflow holes;
an imager, positioned downstream from the die, and configured to acquire an image of the resin strands extruded directly from the outflow holes;
an opening adjustment device configured to adjust the openings of the outflow holes by driving the adjustment valve based on diameters of the resin strands obtained by measuring distances between edges of the resin strands in the image,
wherein the opening adjustment device is configured to calculate an average and a standard deviation of the diameters of the resin strands extruded from respective outflow holes, and when the standard deviation is larger than a predefined predetermined value, determines an opening of each of the outflow holes according to a difference between a diameter of each resin strand extruded from a respective outflow hole and the average.