Slot-cast intergrated interlocking film closure structure
US4755248A · kind A · utility
71Cited by
19References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1986 |
| Grant date | Jul 5, 1988 |
| Priority date | — |
| Expiry date | Dec 30, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/48
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus is disclosed for producing a reclosable bag film. The bag film is produced by extruding a bag film web having a relatively thinner first portion and relatively thicker second portions which are formed unitarily with the first portion. Closure members preferably in the form of male and female fastener profiles, are formed separately from the web portion and joined to the thicker second portions before the thicker second portions have become cooled to an ambient temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.