The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 14, 1982
Filed:
Jul. 11, 1980
Engelbert Neff, Zollikon, CH;
Friedrich Laimer, Reichenburg, CH;
Netstal-Maschinen AG, , CH;
Abstract
An injection molding machine, comprises, an injection piston which is hydraulically actuated during programmed injection and dwell pressure phases. During a speed-controlled injection phase I, the pressure in a tool or mold cavity is measured and monitored. As soon as the pressure reaches an initial desired value, a pressure surge-free switching to the dwell pressure phase II is effected. During the dwell pressure phase, the pressure in the tool cavity is controlled and a pressure in a hydraulic cylinder for moving the injection piston is measured and monitored. A switch signal is produced from the tool pressure and the hydraulic pressure, by means of which a switching to a solidification phase III is effected without causing pressure surges. The actual pressure value at the instant of switching serves as the initial desired value for the solidification phase III. The hydraulic pressure is controlled during this phase.