Plasticizing and injection device
US7717698B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 18, 2005 |
| Grant date | May 18, 2010 |
| Priority date | — |
| Expiry date | Nov 16, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/547
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A plasticizing and injecting device for a plastics injection molding machine includes an axially fixed and rotationally driven plasticizing screw, and an injection plunger movable forwards and backwards inside the plasticizing screw by a linear drive and including, at its front end, a non-return valve. An injection cylinder is provided anteriorly of the plasticizing cylinder. The non-return valve can be moved by the injection cylinder forwards and backwards inside the injection cylinder between a rear position at the beginning of the injection process and a front position after completion of the injection process. In addition, a melt chamber is formed between the front end of the plasticizing screw and the non-return valve, and forms, during the injection process and during the holding pressure phase, an annular gap between the injection plunger and the injection cylinder for receiving plastic melt as the plasticizing screw continues to rotate during injection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.