Methods for forming lines of weakening in closures
US5809860A · kind A · utility
17Cited by
20References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 11, 1997 |
| Grant date | Sep 22, 1998 |
| Priority date | — |
| Expiry date | Apr 11, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/0341
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A line of weakening (24) formed of spaced bridges (44) separated by slits (42) is formed in the skirt of a temperevident closure after the closure has been moulded. The line of weakening (24) is formed by a cutting operation using a knife blade (32) along the edge of which the closure is rolled without slipping. During the operation the snap-engagement band (20) of the closure is held in contact with the interior face of the skirt in transverse alignment with the knife blade (34) and the location of the line of weakening (24).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.