A housing component, for the production of a housing of a multi-shaft screw machine, includes a base body, in which at least two bores interpenetrating each other are configured. The bores extend in a conveying direction through the base body and are limited transversely to the conveying direction by an inner wall. The inner wall configures at least one first wall section and at least one second wall section such that the at least one first wall section is harder than the at least one second wall section. The wall sections, for example, are generated by material application. The housing component allows for a reliable wear protection and a positive influence on the material processing.

A mixing element for an extruder screw having a width extending in an x-direction of an x-y-z coordinate system, a length extending in a y-direction, and a thickness extending in a z-direction. The mixing element includes a base defining a passage extending along an axis in the y-direction for receiving the extruder screw. Projections extend radially outward from the base and define channels therebetween. The width and the depth of each channel vary along the length of the channel.

A mixing element for an extruder screw having a width extending in an x-direction of an x-y-z coordinate system, a length extending in a y-direction, and a thickness extending in a z-direction. The mixing element includes a base defining a passage extending along an axis in the y-direction for receiving the extruder screw. Projections extend radially outward from the base and define channels therebetween. The width and the depth of each channel vary along the length of the channel.

It is provided an extruder for a system for the additive manufacture of freely formable metal parts with or without a supporting structure by means of an extrusion method from a composite material, which is arranged on a three-dimensionally movable kinematic mechanism, with a building platform. The extruder consists of a housing and a screw arranged in the housing. The extruder is provided with a mechanical drive for the composite material to be extruded, with an exchangeable nozzle, arranged on the housing, and the housing is connected to the mechanical drive by way of suitable means for transporting the composite material.

A fractional lobe processor comprises a barrel with heating and cooling means having two parallel intersecting bores of equal diameter, wherein the centre distance between the two bores is lesser than the diameter of the bore; a shaft coupled with a plurality of screw elements to form a screw within each bore, wherein the screws are intermeshing and form at least three zones within the barrel, the zones comprising an intake zone comprising at least one deep flighted shovel element on each intermeshing screw for receiving a feed comprising an active substance and/or an excipient, a melt zone consisting of only fractional lobe elements for melting the active substance and/or an excipient to form a viscous mass or melt, and a discharge zone, wherein the melt zone is located before the discharge zone and after the intake zone; and wherein the melt zone has a plurality of fractional lobe elements on each shaft.

A fractional lobe processor comprises a barrel with heating and cooling means having two parallel intersecting bores of equal diameter, wherein the centre distance between the two bores is lesser than the diameter of the bore; a shaft coupled with a plurality of screw elements to form a screw within each bore, wherein the screws are intermeshing and form at least three zones within the barrel, the zones comprising an intake zone comprising at least one deep flighted shovel element on each intermeshing screw for receiving a feed comprising an active substance and/or an excipient, a melt zone consisting of only fractional lobe elements for melting the active substance and/or an excipient to form a viscous mass or melt, and a discharge zone, wherein the melt zone is located before the discharge zone and after the intake zone; and wherein the melt zone has a plurality of fractional lobe elements on each shaft.

A method of processing of a polymer blend is provided. The method includes the step of introducing a polymer material and a secondary polymer material into a barrel of an extruder. A user-selected gas having a supercritical point is injected into the barrel. The user-selected gas is below the supercritical point thereof. The polymer material, the secondary polymer material and the user-selected gas are mixed within the barrel to form a polymer blend. The polymer blend is ejected from the barrel into a mold, pelletizer or the like.

A screw has a spiral blade for extruding and kneading a high-silica plastic elastomer containing not less than 100 phr of silica. The screw has a first section located on the most downstream side in the extrusion direction and provided with a barrier extending between the adjacent spiral blade threads, while inclining with respect to the screw axial direction. The length of the barrier is 1.5 to 3.0 times the lead length of the spiral blade in the first section. The height of the barrier is 2 to 10 mm lower than the height of the spiral blade. The barrier thickness is 0.9 to 3.0 times the height difference between the spiral blade and barrier.

A shearing part for a plasticising screw has at least one inlet channel and at least one outlet channel, which run helically around or parallel to the longitudinal axis (X) of the shearing part. The inlet channel is open upstream and closed downstream. The outlet channel is open downstream and closed upstream. The inlet outlet channels are arranged lying directly adjacent to one another and contiguous to one another, and are connected directly with one another fluidically, so that inflowing melt can flow over directly from the inlet channel into the outlet channel, wherein a flow direction transversely to longitudinal axis (X) of the shearing part is produced. The inlet channel has a depth (T) at which shearing action on the melt is substantially avoided. The outlet channel is configured as shearing surface, so that shearing action is present onto melt flowing through the outlet channel.

A shearing part for a plasticising screw has at least one inlet channel and at least one outlet channel, which run helically around or parallel to the longitudinal axis (X) of the shearing part. The inlet channel is open upstream and closed downstream. The outlet channel is open downstream and closed upstream. The inlet outlet channels are arranged lying directly adjacent to one another and contiguous to one another, and are connected directly with one another fluidically, so that inflowing melt can flow over directly from the inlet channel into the outlet channel, wherein a flow direction transversely to longitudinal axis (X) of the shearing part is produced. The inlet channel has a depth (T) at which shearing action on the melt is substantially avoided. The outlet channel is configured as shearing surface, so that shearing action is present onto melt flowing through the outlet channel.