Method for the production of foamed thermoplastic film having improved resiliency and flexibility characteristics
US4022858A · kind A · utility
5Cited by
5References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 26, 1974 |
| Grant date | May 10, 1977 |
| Priority date | — |
| Expiry date | Dec 26, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/908
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Improvements in the production of foam form film or sheeting plastic products in order to increase the flexibility characteristics thereof by reducing the size of the voids and increasing the number of voids therein without substantially changing the bulk density, production rate or product size and by reducing the rate at which such foamed products solidify after formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.