Coinjection of hollow articles and preforms
US4931234A · kind A · utility
48Cited by
5References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1989 |
| Grant date | Jun 5, 1990 |
| Priority date | — |
| Expiry date | Feb 6, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/1656
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Method for coinjecting a plurality of thermoplastic materials to mold an article having a layered wall structure using thermoplastic material having different optimum processing temperatures including the maintenance of the optimum temperatures in flow paths individual to each material from its source to a mold cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.