Extrusion of insulating plastic
US4354989A · kind A · utility
20Cited by
11References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 2, 1981 |
| Grant date | Oct 19, 1982 |
| Priority date | — |
| Expiry date | Apr 2, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/34
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Molten plastic material is extruded uniformly about an advancing core by dividing a single stream of the plastic flowing to a die assembly transversely to the direction of advance of the core, into a plurality of streams, in which one half of the plastic flows along a first path spaced around the core and then towards the core; the other half of the plastic flows in a second path which is, in essence, a mirror image of the first path; the divided streams are reunited as a tubular sleeve of flowing plastic flowing in the direction of the advancing core, spaced around the core and flowing towards the advancing core.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.