Positive control non-return valve for an injection molding machine
US6499987B1 · kind B1 · utility
8Cited by
14References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2000 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Feb 22, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/225
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An improved positive control non-return valve assembly which is mounted on the front end of a helical plasticating screw of an injection molding machine. The valve assembly comprises a thread retainer with means for attachment to the plasticating screw. The valve assembly also comprises a distribution chamber that has an annular shaped flow gap and a cylindrical passageway that leads to a plurality of discharge ports. The non-return valve assembly forms a seal, builds pressure, and displaces molten plastic fluid from the distribution chamber through a discharge chamber passageway, and into a mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.