Tri-injection of hollow articles
US4863665A · kind A · utility
41Cited by
3References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1988 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Feb 8, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/1656
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Method for tri-injecting a plurality of thermoplastic materials to mold an article having a layered wall structure using thermoplastic materials having different optimum processing temperatures including the maintenance of the optimum temperatures in flow paths individual to each material from its source at least to the injection nozzle. At least two of the nozzle channels are insulated to prevent heat transfer and to maintain the temperature of the thermoplastic materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.