Method and system for reducing polymer degradation products in two stage injection molding machines
US6241932A · kind A · utility
17Cited by
6References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1999 |
| Grant date | Jun 5, 2001 |
| Priority date | — |
| Expiry date | Mar 15, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/253
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and system of operating a two stage injection molding machine wherein movement of the injection plunger in the shooting pot is coordinated with movement of the plasticizing screw and melt flow into the shooting pot such that the plunger provides minimal resistance to the melt flow into the shooting pot while avoiding the production of voids or air inside the melt. The undesired shear forces to which the melt is exposed are thus reduced, correspondingly reducing the melt degradation products which would otherwise result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.