Kraussmaffei Technologies Gmbh

Stefan Schierl

Stefan Moser

Martin Würtele

Maximilian Schadhauser

Andreas Bierbaumer

Lazlo Giesgen

Dietmar Kraus

Thomas Drogi

The application relates to a plasticizing unit with a cylinder and a screw that is rotatably mounted in the cylinder and has a screw section which is designed as a shearing section and in which a blocking web encircling the screw core in a helical manner and a main screw thread enclosed by the blocking web are provided. A shearing web runs in the main screw thread parallel to the blocking web at a lower height than the blocking web. In this manner, two screw threads are produced which run parallel to each other and are separated by the shearing web. The threads are designed in the form of wave screw threads. Each wave screw thread is equipped with one or more wave peaks with a surface which is designed in the form of a plateau and forms a wave peak shearing surface, wherein the wave peak shearing surface is located at the same height as the surface of the shearing web in the region. The shearing web surface section which lies in the region of a wave peak shearing surface constitutes a shearing web sharing surface. A wave peak shearing surface and a shearing web shearing surface together form a total shearing surface. A specified total shearing surface together with the inner wall of the cylinder forms a shearing gap in accordance with a shearing gap size specified for the total shearing surface.

Plasticizing unit

The invention relates to a method for producing molded parts, wherein semifinished product is heated in a heating device and is subsequently fed to a shaping machine. The heating device has a closed housing having a door or has a separately closable opening. The heating device optionally has a dividable housing, in the case of which the housing components can be moved away from each other in order to form an opening and can be moved toward each other in order to form a closed housing. One or more radiant heaters, in particular infrared radiant heaters, are provided in the interior of the housing. Semifinished product is introduced into the interior of the housing and radiant heat produced by the radiant heaters is applied thereto, said semifinished product is heated, and said semifinished product is subsequently removed from the housing. Thermal convection, which is directed substantially upward in the housing, is produced in the interior of the housing. According to the invention, an air flow counteracting the thermal convention, in particular an air flow directed substantially downward in the interior of the housing, is produced in the interior of the housing.

Method and device for producing molded parts with a semi-finished product

An endless-fibre-reinforced plasticate is described for the additive manufacture of endless-fibre-reinforced plastic components. A plastic material is introduced via a first filling opening into a single-screw extruder and is melted. A mass flow dmF/dt of dry, endless fibre strands is introduced via a second filling opening into the single-screw extruder, impregnated with plastic melt and discharged as fibre-reinforced plasticate. Remote from the second filling opening with regard to conveying, the screw of the single-screw extruder is configured that the fibre strands are discharged substantially undamaged. The mass flow dmF/dt is kept in a first mass flow target ratio to a mass flow dmS/dt of plastic melt discharged from the single-screw extruder, or the mass flow dmF/dt is kept in a second mass flow target ratio to a mass flow dmP/dt of fibre-reinforced plasticate discharged from the single-screw extruder, the exiting endless fibre strands are substantially completely impregnated with plastic melt.

Method and device for the production of a fibre-reinforced plasticate

Growing community of inventors

Germering, Germany

Stefan Schierl