Method of making a zipper for reclosable thermoplastic bag
US5307552A · kind A · utility
49Cited by
5References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1991 |
| Grant date | May 3, 1994 |
| Priority date | — |
| Expiry date | Sep 17, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/9387
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Disclosed is a zipper for a reclosable thermoplastic bag having opposing rib and groove profiles wherein at least one of the opposing zipper profiles has an longitudinally extending part interlockable and substantially free of interdigitation with the opposing profile and wherein the part is structurally discontinuous along its length. When the rib and groove profiles are interlocked, an audible clicking sound and/or a vibratory or bumpy feel perceptible to the touch is imparted. Further disclosed is a process and apparatus for making the zipper wherein a zipper profile is extruded and indentions are formed within and along it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.