Method of and apparatus for producing a pipe of thermoplastic synthetic resin
US5019309A · kind A · utility
37Cited by
9References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 16, 1989 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Oct 16, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29D23/001
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Monofilament threads which are wound around a thermoplastic synethetic resin core tube to form one or more reinforcement coils are generated as they are wrapped around the core tube by liquid crystalline polymer material emerging from respective spinning nozzles which rotate around the core tube while a difference in speed is maintained between the speed at which the reinforcing plastic emerges from the nozzle and the monofilament thread is wound on the core tube to maintain a stretch in the monofilaments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.