Pressure diecasting or injection molding machine
US5543105A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1994 |
| Grant date | Aug 6, 1996 |
| Priority date | — |
| Expiry date | Sep 30, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/78
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for injection molding. The injection molding machine includes a mold formed by a fixed mold half and a movable mold half cooperating with the fixed mold half for defining a mold cavity of the mold and a gate channel leading to the mold cavity. An injection piston is operatively associated with the mold cavity for pressing a melt via the gate channel into the mold cavity. A sensor device detects a melt front of the melt rising upstream of the mold cavity in a conveying direction of the melt at a predetermined detection height. The sensor device includes walls defining a measurement gap disposed at the detection height and extending transversely to the conveying direction of the melt. The measurement gap is at least partially penetrated by a fraction of the melt from the melt front when the melt front rises toward the mold cavity. A measuring device operatively associated with the measurement gap is responsive to a presence of the fraction of the melt in the measurement gap without directly contacting the melt and generates a measurement signal for controlling predetermined parameters of the machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.