Crosshead
US4280801A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 1979 |
| Grant date | Jul 28, 1981 |
| Priority date | — |
| Expiry date | May 30, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/3462
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A crosshead for extruding an annular layer of thermoplastic material about a central longitudinal axis. The crosshead comprises a die having an annular slotted die opening surrounding the axis, a transverse inlet passageway for receiving molten thermoplastic material, an annular cavity connected to the inlet passageway, an annular distribution passage connected to the annular cavity and an annular connecting passage extending from the annular distribution passage to the die opening. The annular cavity and annular distribution passage each extend radially with respect to the longitudinal axis. Two or more layers of thermoplastic material are extruded by the crosshead when it is equipped with two or more dies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.