Plasticising unit for a screw injection moulding machine having improved volume adjustment means
US5304051A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1991 |
| Grant date | Apr 19, 1994 |
| Priority date | — |
| Expiry date | Jun 24, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/62
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A plasticizing unit is provided for palsticizing material which is subsequently supplied to an injection molding press. The unit includes a screw disposed in a barrel which has an inlet, an outlet, a reservoir zone portion, and a plasticizing zone portion. The plasticizing zone portion of the barrel and the screw each have a continuous helical groove of opposite hand as the other groove and the grooves transfer material therebetween to effect plasticizing of the material. The reservoir zone portion of the barrel receives a shot volume of material which has been plasticized during passage through the helical grooves of the barrel and the screw. A volume displacement member which is axially movably disposed in a bore of the screw is movable within the reservoir zone portion to selectively control the shot volume of plasticized material received in the reservoir zone portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.