Planetary extruder for thermoplastics material
US4268176A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 9, 1980 |
| Grant date | May 19, 1981 |
| Priority date | — |
| Expiry date | Jan 9, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/03
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In a planetary extruder for extruding thermoplastics materials, a threaded main spindle is meshed with and surrounded by threaded planetary spindle. To improve pull-in of material, the planetary spindles are provided in groups, each group comprising at least three spindles. The first planetary spindle of each group corresponds in length to the main spindle and succeeding spindles, considered in an opposite direction to the direction or orbital movement of the planetary spindles, of each group are each shorter than the spindle which immediately precedes it to form receiving spaces for material fed by a feed screw, which receiving spaces in operation are continuously enlarging. In one embodiment in each group, the spindles which are successively shorter are followed by spindles which are successively longer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.