Method of imparting increased foldability to fold lines in paper

Details Method of imparting increased foldability to fold lines in paper Method of imparting increased foldability to fold lines in paper

1992-09-10

1993-12-14

Terrell, William E.

Manufacturing container or tube from paper; or other manufacturi

Bending

493396, 493459, 162271, B31F 100, B31F 108, B31B 325

Patent

active

052697436

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.

REFERENCES:
patent: 3055152 (1962-09-01), Williams
patent: 4290764 (1981-09-01), Middel
patent: 4371364 (1983-02-01), Rausing
patent: 4539072 (1985-09-01), Frye et al.
patent: 4650455 (1987-03-01), Kondo
patent: 4795414 (1989-01-01), Blumle

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