Fine tooth perforation for webs
US4745835A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1981 |
| Grant date | May 24, 1988 |
| Priority date | — |
| Expiry date | Sep 15, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/9408
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.