Method of forming a ply separation region in a paperboard blank

Details Method of forming a ply separation region in a paperboard blank Method of forming a ply separation region in a paperboard blank

1991-08-07

1992-12-01

Terrell, William E.

Manufacturing container or tube from paper; or other manufacturi

Container making

Rigid container

493963, B31B 325, B31B 125

Patent

active

051676060

ABSTRACT:
A tear strip is formed in a paperboard container blank by scoring a line of weakness on each of the opposite surfaces. The lines are offset from each other to form between them an area where the piles are easily separated. One or both lines are formed by impressing the blank with a diamond pattern knurling tool.

REFERENCES:
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patent: 3409206 (1968-11-01), Slovka et al.
patent: 3443489 (1969-05-01), Watkins
patent: 3580466 (1971-05-01), Thelen et al.
patent: 3835754 (1974-09-01), Lewyckyj
patent: 4613046 (1986-09-01), Kuchenbecker
patent: 4687104 (1987-12-01), Ielmini
patent: 4740163 (1988-04-01), Kuchenbecker
patent: 4746109 (1985-06-01), Bar et al.
patent: 4951824 (1990-08-01), Kuchenbecker et al.

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