Title:
PLASTIC SHEET WITH FOLDABLE RULED LINE AND RULED LINE BLADE FOR PLASTIC SHEET
Document Type and Number:
Japanese Patent JP3422953
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To make a plastic sheet hardly breakable and a packaging operation using the sheet automatic when the plastic sheet is used as a packaging container by arranging two or more curved projecting crosswise grooves in a direction almost at right angles with the longer direction of a ruled line groove and besides, at an appropriate interval in the longer direction of the ruled line groove.
SOLUTION: The ruled line blade is made up of a combination of a longitudinal edge 14, a curved recessed face 16 and a crosswise edge 15. The longitudinal edge 14 is an edge formed in the direction of the ruled line blade (the direction of the length of a blade) and the crosswise edge 15 is an edge formed in a direction almost orthogonal with the direction of the ruled line blade. Since the crosswise edge 15 is present at a deeper position than the longitudinal edge 14, the ruled line nicked by the crosswise edge 15 leaves a thicker residual wall in a plastic sheet compared to the ruled line by the longitudinal edge 14. In addition, the residual wall formed by both crosswise edge 15 and curved recessed face 16 works to suppress an elastic force to restore the residual wall to its original state. Further, the advantage is that the ruled line blade which is capable of meeting whatever kinds of materials may be used by combining the number of the curved recessed faces 16 with the longitudinal edge 14, can be designed.
Inventors:
Kunitsugu Suzuki
Application Number:
JP24217299A
Publication Date:
July 07, 2003
Filing Date:
August 27, 1999
Export Citation:
Assignee:
Fuji Seal Co., Ltd.
International Classes:
B26F1/00; B26F1/44; B29C53/06; B31B5/00; B31B50/25; B65D5/02; B65D5/42; B29K101/12; B29L22/00; (IPC1-7): B29C53/06; B65D5/42
Domestic Patent References:
| JP1141720A | ||||
| JP4201231A | ||||
| JP49345B2 |