Use of surface active agents for improved cooling of thermoplastic film webs
US5049223A · kind A · utility
31Cited by
9References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 8, 1990 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | Jan 8, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/917
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An improved cooling process for thermoplastic film webs, profiles, or shapes and interlocking closure profiles extruded onto film webs for use on reclosable bags or containers is provided. A mixture of a surfactant and water is used to cool film webs or closure profiles which have been extruded and secured onto a film web. The surfactant lowers the surface tension of the water, improving its wetting properties and providing faster cooling of the film. The resulting film structures are more stable and consistent in structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.