Undercut feed section screw
US3949973A · kind A · utility
5Cited by
8References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 5, 1974 |
| Grant date | Apr 13, 1976 |
| Priority date | — |
| Expiry date | Jul 5, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/47
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A screw for injection molding of synthetic resinous material having a tendency to abrade and score the injection molding apparatus is provided along a substantial length of the feed section with a substantially undercut screw flight. An average particle of synthetic resinous feed stock material may pass between the undercut screw flights and a cooperating barrel without squashing. The undercut screw flights are effective to provide a controlled feed pressure for the particulate material entering the downstream portion of the screw.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.