Adaptive process control for injection molding
US4850217A · kind A · utility
16Cited by
13References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 17, 1988 |
| Grant date | Jul 25, 1989 |
| Priority date | — |
| Expiry date | Oct 17, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/7646
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An injection molding machine is utilized to develop PVT constants for a given material by pressurizing the material in the barrel against the blocked outlet nozzle, measuring the volume during pressurization, and then weighing the pressurized shot after it is purged from the barrel in order to calculate the specific volume of the material. Plotting specific volume against a variety of pressure and temperature values produces a plot of PVT relationships from which the constants can be derived.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.