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AssigneeKonrad Friedrichs KG
InventorKonrad Friedrichs
Estimating the term…
Method and apparatus for the continuous extrusion of rods of plastic raw material. The rods contain at least one inner channel which is at least in part spiral-shaped. The raw material may be a powder-metallurgical or ceramic mass. The material is extruded through a nozzle mouthpiece and made to rotate by an arrangement of flow guiding surfaces. At least one thread made of a flexible or elastic material is entrained and gives the rod a spiral shape with a predetermined pitch. The thread is retained upstream of the nozzle mouthpiece in an eccentric position relative to the rod axis that extends through the nozzle mouthpiece. The movement of rotation of the raw material is adjusted by an outer adjusting force which modifies the angle between the arrangement of flow guiding surfaces and the longitudinal axis of the nozzle mouthpiece to adjust the position and pitch of the spiral channel.
A process for continuous extrusion of rods of plasticized raw material provided with at least one internal channel which is helical in at least one portion, in which the plasticized raw material is pressed out of a nozzle mouthpiece, an array of flow guiding surfaces provided in the nozzle mouthpiece and participating in imparting thereto a rotational motion, which entrains at least one filament of easily bendable or elastic material, said filament being retained upstream from the nozzle mouthpiece at a point off an axis of the rod and extending through the nozzle mouthpiece, and shapes the at least one internal channel to helical form with predetermined pitch, characterized in that, for adjustment of a position and/or a pitch of the at least one helical internal channel, the rotational motion of the plasticized raw material is adjusted by an external positioning force, which varies an angular inclination of the flow-guiding surfaces relative to a longitudinal axis of the nozzle mouthpiece.
A method for extruding a rod of plasticized raw material, said method comprising the steps of:
An apparatus for continuous extrusion of rods of plasticized raw material provided with at least one internal channel which is helical in at least one portion, said apparatus comprising a nozzle mouthpiece in which there is provided an array of flow guiding surfaces and through which there extends at least one filament of easily bendable or elastic material, said at least one filament being retained upstream from the nozzle mouthpiece at a point off an axis of the rod, characterized in that an angle of inclination of the flow-guiding surfaces relative to a longitudinal axis of the nozzle mouthpiece can be varied by means of a positioning device.
An apparatus for continuous extrusion of rods of plasticized raw material provided with at least one internal channel which is helical in at least one portion, said apparatus comprising a nozzle mouthpiece in which there is provided an array of flow guiding surfaces and through which there extends at least one filament of easily bendable or elastic material, said at least one filament being retained upstream from the nozzle mouthpiece at a point off an axis of the rod, characterized in that an angle of inclination of the array of flow-guiding surfaces relative to a longitudinal axis of the nozzle mouthpiece can be varied by means of a positioning device, characterized in that the array of flow-guiding surfaces is provided with at least one guide blade, which is fixed adjustably to the nozzle mouthpiece.
An apparatus for extruding a rod of plasticized raw material, said apparatus comprising:
An apparatus for extruding a rod of plasticized raw material, said apparatus comprising:
Dependencies are inferred from the claim text.