Apparatus for producing, by extrusion, flat profiled articles of plastic mixtures of various composition
US4643659A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1985 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Mar 19, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2030/002
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
To extrude, for pneumatic tires, uncured tread strips composed of three different rubber or synthetic material mixtures, three extruders are used which feed to a common extruder head and are connected with the latter. The present invention utilizes the favorable flow conditions resulting from the known Y-arrangement of three extruders within the extruder head, while at the same time avoiding the previously unavoidable complex and expensive specialized construction of the extruder head. Inventively, the third extruder, which opposes the two first extruders in the withdrawal direction, is not screwed or clamped to the extruder head which is common to all three of the extruders. Rather, the third extruder is easily detachably connected via a direct metal-to-metal contact with the extruder head only by a frictional connection in a longitudinally movable arrangement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.