Apparatus for injection molding of multi-layer bodies of thermoplastic
US3947177A · kind A · utility
60Cited by
7References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 6, 1974 |
| Grant date | Mar 30, 1976 |
| Priority date | — |
| Expiry date | Sep 6, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/224
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Method and apparatus for the intermittent manufacture of multi-layer molded bodies of thermoplastic material with a foamed core and an unfoamed shell, wherein a strand of a nonfoaming plastic of ring-shaped cross-section enclosing a strand of plastic containing a foaming agent is injected into a mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.