Method and apparatus for making reclosable bags with fastener strips in a form fill and seal machine
US4894975A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 9, 1988 |
| Grant date | Jan 23, 1990 |
| Priority date | — |
| Expiry date | Mar 9, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B70/8132
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for forming a tube and bag from a supply of thin thermoplastic film with the film being formed into tubular shape about a filling tube with the edges of the film brought together and joined solely by a zipper strip having reclosable pressure interlocking members thereon with the zipper strip preferably heat sealed to the film and the zipper strip having a web between the pressure interlocking members which provides a tamper-evident juncture between the edges of the film so that the web must be severed for access to the interior of a bag formed from the film, and individual bags formed from the continuous tube by filling the tube through the filling tube and cross-seaming and cutting individual bags from the continuous film tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.