Process for microperforating zippered film useful for manufacturing a reclosable zippered bag
US5405561A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1993 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | Aug 31, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1304
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A process for providing microperforations in a zippered film useful for manufacturing reclosable zippered produce bags including the steps of PA1 (a) providing a web of thermoplastic film with zipper profile members on at least one side of the web, the zipper profile members spaced apart on the web forming a central web area between the profiles; PA1 (b) feeding the web between the nip of a cylinder having a plurality of heated pins and a pressure roller such that a plurality of microholes are formed in the central web area between the zipper profile members; and PA1 (c) maintaining the web in feeding alignment between the pin cylinder and the pressure roller such that uniform sized microholes are perforated in the web area between the profile members.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.