Uponor Innovation Ab

Michael Sj&ouml;berg

Jyri J&auml;rvenkyl&auml;

Kari Kirjavainen

Terho Lahtinen

An apparatus for manufacturing an extruded plastic product, the apparatus including at least one rotor and at least one stator defining a clearance having a feed gap between them, the rotor and stator collectively including a groove for moving material to be extruded from a feed zone of the apparatus to a shear zone of the apparatus upon rotation of the rotor and a countergroove for facilitating the extrusion of the material, the groove and countergroove being disposed on opposite sides of the feed gap, the countergroove having a thread that is opposite in direction to a thread of the groove, the groove having a cross-section that is substantially unchanging, the countergroove being disposed substantially along an entire length of the shear zone, the groove, countergroove and clearance forming a processing cavity having a volume that is the volumes of grooves, countergrooves and the clearance, the processing cavity having a cross-sectional area that decreases continuously along at least a part of an axis of the apparatus.

Apparatus for extrusion of polymers and plastic products formed with the apparatus

A method for manufacturing an extrudable product including the steps of (a) providing an apparatus including an extruder having at least one rotor with first grooves, at least one stator with second grooves and a clearance between the rotor and the stator, the first grooves, second grooves and clearance forming a processing cavity having a volume that is equal to the volumes of the first grooves, the second grooves and the clearance, the processing cavity having a cross-sectional area that decreases continuously along at least a part of an axis of the extruder, the extruder further having a supply for feeding a material to be extruded into the processing cavity; b) feeding the material to be extruded in a powder, pellet or granuate form into the processing cavity through the supply and causing rotation of the rotor relative to the stator such that the material is forced to proceed along an x-axis in a shear zone of the extruder where the material is subjected to a shear which causes a fictional heat that melts a part of the material and forms a bed of mainly unmelted particles and melt around the particles, the processing cavity being completely filled at a cross-sectional portion thereof that is a distance from the end of the extruder, the unmelted particles being present in the cross-sectional portion in an amount sufficient to increase a pressure in the extruder to a level that is higher than that needed for pushing the material further along the x-axis to a die.

Extrusion of high molecular weight polymers

An extrusion material is extruded through a tool and a fluoropolymer is between the extrusion material and a surface of the tool for reducing friction between the extrusion material and the surface of the tool. The surface of the tool is of a material with thermal conductivity greater than 30 W/mK.

Growing community of inventors

Västerås, Sweden

Michael Sjöberg

Growing community of inventors

Västerås, Sweden

Michael Sj&ouml;berg

Michael Sjöberg