Method for producing an elastomeric crumb using gas to first cut an extruded hot, sticky elastomeric extrudate material, form the crumb, and then convey it away
US5063002A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 14, 1990 |
| Grant date | Nov 5, 1991 |
| Priority date | — |
| Expiry date | Feb 14, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2793/009
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for producing particles of polymeric material by extruding hot, sticky material in a plastic state through orifices in a die plate. The extruded plastic material is cut into crumb upon exit from the orifices by a high velocity gas stream, suitably air, and the particles conveyed away from the die face. The air supply is coupled to a cutting chamber for providing the stream of air across the face of the die plate to cut and convey the crumb away from the orifices. The cutting chamber is arranged to include a restricted throat having an exit area in close proximity to the orifices and a further portion for providing an accumulation zone adjacent the orifices, the accumulation zone having a cross-sectional area which increases from the exit area of the throat to a product discharge zone remote from the orifices in a downstream direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.