Patents Assigned to Netsal-Maschinen AG
  • Patent number: 6796783
    Abstract: The novel solution provides a closing part comprising an electromechanical drive for a CD injection molding machine having a working stroke and a servicing stroke. The entire mold closing unit is characterized by the combination of a short-stroke crank mechanism which is operated by an electric motor and which is provided for the working stroke and of a central electromotive column-type nut drive for the servicing stroke. According to the invention, synchronous motors or asynchronous motors are used with corresponding servo boosters to realize servo axles. The central column drive is used as a control element of the closing force control, together with a force sensor for detecting the closing force, as an actual value transmitter and as a control device.
    Type: Grant
    Filed: November 14, 2001
    Date of Patent: September 28, 2004
    Assignee: Netsal Maschinen AG
    Inventors: Robert Weinmann, Bruno Stillhard, Ralph Keitel
  • Patent number: 4648827
    Abstract: A screw plastifying and conveying device includes a screw (5) which has a pull-in zone (I) of constant pitch volume (V.sub.0), a first compression zone (II), and adjacent thereto, i.e. in the injection side, a second compression zone (III). The compression ratio (V.sub.1 :V.sub.0) of the second compression zone (III) is between 1:1.0 and 1.2, while that of the first compression zone is between 1:1.6 and 1:4. This makes it possible, by underdosing, to reduce the melt volume in the second compression zone, thereby achieving stable conveying action over a wide operating range. Molded parts with minimal internal tensions and e.g. also molded parts of glass-clear material with unobjectionable optical properties can thus be produced.
    Type: Grant
    Filed: September 21, 1984
    Date of Patent: March 10, 1987
    Assignee: Netsal-Maschinen AG
    Inventors: Friedrich Laimer, Hermann Neugebauer