Film-tape-closure device slot cast integrated interlocking structure and extrusion method
US4428788A · kind A · utility
72Cited by
15References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 14, 1982 |
| Grant date | Jan 31, 1984 |
| Priority date | — |
| Expiry date | May 14, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24777
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for extruding a film, a tape and a closure device simultaneously to produce integrated interlocking closure stock comprising (a) extruding a sheet of film onto a rotating casting roll at a rate to provide a high draw-down ratio; (b) extruding a tape to join the film on the casting roll at a rate to provide a medium draw-down ratio; and (c) extruding a closure device onto the tape as it approaches the casting roll at a rate to provide a small draw-down ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.