A method of processing solid polymer particles of a poly condensate by a multi-rotation system. Polymer particles are melted in a first extruder section having an extruder screw that rotates. The partly molten polymer mass containing between 5% by volume and 50% by volume of unmolten polymer particles is passed into a second extruder section with a poly-rotation unit and multiple satellite screws that rotate therein. A diameter of the poly-rotation unit is increased compared to the screw diameter of the first extruder section and a transition cone is formed between the extruder sections and a conical gap is formed with respect to the housing. Ambient pressure plastification of the remaining polymer particles is performed by passage through a drive zone. The polymer mass is guided completely molten in the drive zone onward through a venting zone under reduced pressure.

A tube for a peristaltic pump comprises an elastically deformable tubular body (2) made from a PVC composition containing: 100 phr of a PVC resin having a K value, measured according to standard ISO 1628-2, of not less than 85, from 40 to 100 phr of DEHA plasticizer, from 0.05 to 1.0 phr of lubricant, from 0.3 to 15.0 phr of stabilizer and co-stabilizer. The deformable tube, which is usefully employed for liquid transport in a dialysis apparatus, enables a high level of fluid transport efficiency to be maintained, even after many hours of peristaltic pump operation.

A screw for a plasticating apparatus has one or more helical flights. A portion of the screw has a plurality of advancing grooves arranged in a noncontinuous helix cut in the screw. The advancing grooves are dimensioned to receive material therein as the material is conveyed through the barrel. The screw has a plurality of noncontinuous cross-cut grooves traversing one or more of the advancing grooves. The cross-cut grooves have a second helix angle greater than the first helix angle and less than ninety degrees; and/or one or more of the cross-cut grooves have a third helix angle of about ninety degrees.

A screw for a plasticating apparatus has one or more helical flights. A portion of the screw has a plurality of advancing grooves arranged in a noncontinuous helix cut in the screw. The advancing grooves are dimensioned to receive material therein as the material is conveyed through the barrel. The screw has a plurality of noncontinuous cross-cut grooves traversing one or more of the advancing grooves. The cross-cut grooves have a second helix angle greater than the first helix angle and less than ninety degrees; and/or one or more of the cross-cut grooves have a third helix angle of about ninety degrees.

An apparatus (1) for optical inspection of a mass of polymeric material (2) passing through an extruder (3) having a hollow extrusion cylinder (4) extending elongately in a longitudinal direction comprises an optical sensor (8) which can be operatively coupled to the extrusion cylinder (4) and having an infrared light emitter (8a) and a receiver (8b) configured to measure a measurement parameter representing an optical property of the polymeric material (2) inside the extrusion cylinder (4) and is characterized in that it comprises a plurality of the optical sensors (8) which can be operatively coupled to the extrusion cylinder (4) in a plurality of measurement sites located in succession and spaced from each other along the longitudinal direction and a processor (9) programmed to acquire a plurality of measurement signals containing the measurement parameters measured by the corresponding optical sensors (8) and programmed to process the plurality of measurement signals in order to calculate a corresponding plurality of values of a control parameter indicating a physical state of the polymeric material (2) as a function of a longitudinal position.

A plasticizing device includes: a drive motor; a rotating unit driven to rotate about a rotation axis by the drive motor and having an end surface perpendicular to the rotation axis and a lateral surface intersecting with the end surface; a barrel having a bottom surface facing the end surface of the rotating unit, and a heater; a case accommodating the rotating unit; and a material supply unit accommodating the material. At least one of the barrel and the case has a sidewall surface facing the lateral surface of the rotating unit and standing up along an outer circumference of the bottom surface of the barrel. At the bottom surface of the barrel, a communication hole through which the molten material flows out and a spiral groove part coupled to the communication hole are formed. The lateral surface of the rotating unit and the sidewall surface together define a supply space where the material is supplied from the material supply unit to the groove part.

A device and a method for extruding plastics, comprising an extruder screw, a housing with a cavity, a drive unit for rotatably driving the extruder screw, a heating element arranged on the housing alongside the extruder screw, a filling unit through which shredded plastic can be supplied into the cavity, and a filler metering device. Upon rotation, the extruder screw conveys the shredded plastic in the transport direction along a longitudinal axis of the extruder screw. The housing has a feeding port for the filler opening into the cavity, wherein the filler metering device is connected to the feeding port and is designed for supplying a filler dispersed in a gas stream into the cavity.

Liquid mixing processes are provided for producing an elastomeric composition as a function of a selected elastomeric composition recipe. A system (10) is also provided for the production of an elastomeric composition according to the disclosed liquid mixing processes.

A heating apparatus for at least one housing section of a screw extruder comprises at least two heating elements which are connected to contact plugs via connection lines. For the purpose of supplying power, the heating apparatus comprises an electrical supply line which is connected to a plug-in contact distributor. The plug-in contact distributor comprises at least two plug-in contacts. The contact plugs are releasably connected to the plug-in contacts. The heating apparatus renders possible simple exchange of a heating element and is therefore easy to service. The modular construction of the heating apparatus renders possible flexible use.

A hopper charged with a powder material, a screw arranged below the hopper and exposed at a supply port formed at the bottom of the hopper, and a rolling element in contact with the screw at the supply port are provided. The rolling element is larger than a space between end portions of the supply port and a screw groove of the screw.