Sheet materials
US4093686A · kind A · utility
7Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1976 |
| Grant date | Jun 6, 1978 |
| Priority date | — |
| Expiry date | Sep 14, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24554
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for the manufacture of a differentially expanded sheet material comprises applying an organic solvent to the surface of an expandable thermoplastic sheet containing a blowing agent and allowing the treated sheet to at least partially dry before a composition comprising an ink and a kicker for the blowing agent is applied to selected areas of the treated surface. The sheet is then heated so that differential expansion occurs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.