Mold compression control process for an injection molding machine and apparatus thereof
US4917840A · kind A · utility
20Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1989 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Jan 25, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/562
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus controlling an injection molding machine having a compression process. The velocity is controlled using a closed loop single or multi-step programmed velocity control method or a closed loop multi-step programmed slope velocity control method. Pressure may be controlled using a multi-step programmed pressure control method in which a pressure signal is detected from a detector set in the mold die or set in the clamping cylinder. The method of the present invention improves the accuracy and density of articles molded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.