Mold clamping equilization system
US5044927A · kind A · utility
15Cited by
4References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 17, 1990 |
| Grant date | Sep 3, 1991 |
| Priority date | — |
| Expiry date | May 17, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/322
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Injection molding machines for making plastic articles having a stack mold arrangement frequently suffer from the problem of unbalanced forces. Various novel techniques for counteracting and/or avoiding the production of these forces are disclosed. These techniques include the use of latches to lock an injection nozzle to a sprue bar, the use of shutters to lock the sprue bar to a stationary platen, the use of a force compensator in a moving stack mold half, and the use of an injection nozzle axially offset from the sprue bar.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.