Extrusion system and process for minimizing color change times in extrusion of thermoplastics
US5980098A · kind A · utility
3Cited by
5References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 5, 1997 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Nov 5, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/0005
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An extrusion system includes a main extruder and a secondary injection extruder. Both extruders are connected via a three-way valve. The main extruder has a mixing section downstream of the junction point with the secondary injection extruder. An accelerated switch between molding masses with different colors can be made by switching the three way valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.