US 11,833,774 B2
Dimensionally variable lid manufacturing method and dimensionally variable lid manufacturing device
Yoshitsune Tanaka, Tokyo (JP); Hiroyuki Noguchi, Tokyo (JP); Hiroshi Kawado, Saitama (JP); Chiaki Watanabe, Tokyo (JP); Keiichi Fujitani, Osaka (JP); Aya Kinugawa, Osaka (JP); and Mikina Soma, Tokyo (JP)
Assigned to RENGO CO., LTD., Osaka (JP)
Appl. No. 17/601,181
Filed by RENGO CO., LTD., Osaka (JP)
PCT Filed Mar. 30, 2020, PCT No. PCT/JP2020/014577
§ 371(c)(1), (2) Date Oct. 4, 2021,
PCT Pub. No. WO2020/203978, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-072935 (JP), filed on Apr. 5, 2019.
Prior Publication US 2022/0176670 A1, Jun. 9, 2022
Int. Cl. B31B 50/20 (2017.01); B31B 50/25 (2017.01); B31B 50/88 (2017.01); B65D 5/54 (2006.01); B65D 5/64 (2006.01); B31B 120/10 (2017.01)
CPC B31B 50/20 (2017.08) [B31B 50/25 (2017.08); B31B 50/88 (2017.08); B65D 5/548 (2013.01); B65D 5/64 (2013.01); B31B 2120/10 (2017.08)] 8 Claims
OG exemplary drawing
 
1. A dimensionally variable lid manufacturing method for manufacturing lids which are, respectively, to be placed on a plurality of boxes different in size from each other such that each of the lids has a size corresponding to a size of a top end opening of a corresponding one of the boxes, the method comprising:
preparing rectangular lid sheets which are to be formed into the respective lids, each of the rectangular lid sheets being defined by a first reference side, a second reference side intersecting with the first reference side at a right angle, a first adjustment side extending parallel to the first reference side, and a second adjustment side extending parallel to the second reference side,
forming each of the lid sheets, beforehand with a first scoreline that allows the lid to be bent downwardly along a first side of the top end opening of the corresponding one of the boxes, and a perforated line along which the lid of the lid sheet can be severed, the first scoreline and the perforated line extending along, and parallel to, the first reference side of the lid sheet;
cutting off a portion of each of the lid sheets along the first adjustment side in a strip shape with a first cutter;
cutting off a portion of the lid sheet along the second adjustment side in a strip shape using a second cutter; and
concurrently while cutting off the portion of each of the lid sheets along the first adjustment side, forming, in the lid sheet, a second scoreline extending parallel to the first scoreline using a scoreline roller disposed at a predetermined interval from the first cutter such that the second scoreline allows the lid to be bent downwardly along a second side of the top end opening of the corresponding one of the boxes, the second side being opposed to the first side;
wherein a cut-off width of the portion of the lid sheet cut off by the first cutter, and a cut-off width of the portion of the lid sheet cut off by the second cutter are adjusted according to the size of the top end opening of the corresponding one of the boxes.