The invention relates to a method for the changing of material from a starting material to a subsequent material with an extrusion device (10) for the production of extrusion products (100) comprising the following steps: recognition of a change of material requirement, performance of at least one preparation step for the change of material, performance of the change of material after termination of at least one of the preparation steps.

In particular embodiments, a process for producing bulked continuous carpet filament from recycled polymer utilizes two vacuum pumps in combination with a single extruder. In various embodiments, the dual vacuum arrangement (e.g., at least two vacuum pumps) operably coupled to the single extruder (e.g., MRS extruder) may be configured remove one or more impurities from recycled polymer as the recycled polymer passes through the extruder such that the process: (1) is more effective than earlier processes in removing contaminates and water from the recycled polymer; (2) allows for an increased throughput through a single extruder, which may result in a doubling of a number of thread lines produced from a single extruder; (3) results in a desired intrinsic viscosity for the extruded recycled polymer at the increased throughput; and/or (4) reduces an amount of downtime of a particular production line as a result of cleaning the two vacuum pumps.

The present invention relates to new screw elements for multi-screw extruders with pairs of co-rotating and fully wiping screws.

Device for cleaning an extruder intended to operate with elastomeric mixtures comprising a frame (11) supporting a screw (2) and a barrel (1), the screw (2) being made to rotate about the longitudinal axis (X-X) of the barrel (2) when it is rotationally driven by drive means, the barrel comprising an elastomeric-mixture feed inlet (3) and an outlet (4) opening directly into an extrusion die (21) mounted on a support (20).

According to the invention, the frame (11) is mounted with the ability to move translationally with respect to the die (21) support (20) in a direction parallel to the longitudinal axis X-X between a first position in which the barrel (1) and the die (21) are in sealed contact to allow the elastomeric mixture to pass through the die (21) and a second position in which the barrel (1) is moved away from the die (21) in order to perform cleaning, the parting line between the barrel (1) and the die being substantially axisymmetric with respect to the axis X-X and in that the said device comprises an automatic coupling mechanism (40) for quickly locking and unlocking the barrel (1) and the die (21) and allowing the frame (11) to move between the two positions.

A method for preparation of decontaminated natural rubber is provided. The method is characterized in that it comprises a decontamination step in which wet natural rubber coagulum passes through a system comprising an extruder and a filter installed at the extruder outlet, the extruder comprising an axially symmetrical grooved sheath comprising in its thickness grooves opening on the inner surface of the sheath.

A cleaning agent for cleaning polymer processing equipment, a method for producing such cleaning agent and the use of such cleaning agent for cleaning polymer processing equipment or any component thereof. The cleaning agent comprises i) a thermoplastic resin and ii) a foaming agent selected from alkali metal and ammonium bicarbonates.

The invention relates to novel screw elements for multi-screw extruders with screw profiles co-rotating in pairs and being fully self-wiping in pairs, to the use of the screw elements in multi-screw extruders and to a process for extruding plastic compositions.

A planetary roller extruder for homogenizing, dispersing, pasteurizing, and purposefully controlling the temperature of biodegradable materials that are prone to altering their properties during processing, in particular the properties that rule out further use after the materials have been processed, such as food, medicinal products or pharmaceutical products, different regions being present in the planetary roller extruder. The planetary roller extruder includes a flow conduit having various transitions from one region to a next region in an interior and components being statically and movably installed. A seal is installed between statically installed components, by which seal gaps or cavities present are configured to be closed. A slide ring seal provides sealing between moving components, which are led from the flow conduit in the interior outward to a surrounding area, so as to avoid steps and/or notches along flow surfaces in a transition region of the moving components.

The present invention relates to screw elements with novel, tightly intermeshing, self-cleaning, co-rotating screw profiles for multishaft screw machines with pairs of co-rotating and fully abrading screw shafts, to the use of these screw elements in multishaft screw machines and to a method of generating these screw elements.

The present invention relates to new screw elements for multi-screw extruders with pairs of co-rotating and fully wiping screws.