Method and apparatus for venting entrapped air in mold cavities
US4091069A · kind A · utility
24Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1977 |
| Grant date | May 23, 1978 |
| Priority date | — |
| Expiry date | Feb 17, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/812
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Air that becomes entrapped in a closed mold cavity during the injection of liquid plastic material into the cavity is vented into the flowing liquid coolant of the mold to be exhausted therewith while leakage of coolant into the mold cavity during nonventing is prevented by maintaining the coolant at less than atmospheric pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.