Fine tooth perforation for webs

Details Fine tooth perforation for webs Fine tooth perforation for webs

1981-09-15

1988-05-24

Schran, Donald R.

Cutting

Tool or tool with support

Rotatable type

83660, 281 2, B26F 120

Patent

active

047458356

ABSTRACT:
A perforating blade for creating extremely fine perforations in plural plies of a multiply ply paper construction including a perforating edge defined by a plurality of perforating elements separated by notches. Preferably there are about 50 or more of each of the elements and the notches per lineal inch with the notches having a length along the cutting edge of no more than about 0.010 inches. A relatively small number of the perforating elements, at generally uniformly spaced locations along the edge have lengths of about 0.03 inches or more with the remainder of the elements having lengths substantially less than 0.03 inches. The blade provides lines of perforation that when separated, have the appearance of the edge of a so-called cut sheet.

REFERENCES:
patent: 3978783 (1976-09-01), Meaden et al.
patent: 4074599 (1978-02-01), Allen
patent: 4188251 (1980-02-01), Grass et al.

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