The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 14, 1993
Filed:
Sep. 10, 1992
Applicant:
Inventor:
Kiyoshi Sakuma, Tokyo, JP;
Assignees:
Jujo Paper Co., Ltd., Tokyo, JP;
Shihoku Kakoki Co., Ltd., Itano, JP;
Primary Examiner:
Int. Cl.
CPC ...
B31F / ; B31F / ; B31B / ;
U.S. Cl.
CPC ...
493395 ; 493396 ; 493459 ; 162271 ;
Abstract
A strip of paperboard material having a thickness of 170 to 600 .mu.m and a multiplicity of fold lines formed widthwise thereof at a predetermined spacing and U-shaped in cross section is caused to travel as reeved around two prefolding rolls, 5 to 30 mm in diameter, from different directions at a contact angle of 40 to 270 degrees to bring the projecting side of the fold lines into contact with the peripheral suface of one of the rolls and the indented side of the fold lines with the peripheral surface of the other roll. This method imparts increased foldability to the fold lines.