Techniques recycle plastics in multiple successive process steps. A polymer, preferably a recyclable material, is melted using a discharge extruder, filtered using a first filter device under a positive pressure atmosphere, filtered and degassed using a degassing device, and discharged using a discharge extruder. The degassing device has at least one filter element and a vacuum chamber with a negative pressure atmosphere for filtering and degassing purposes, wherein the plastic melt can be conducted into the negative pressure atmosphere of the vacuum chamber through the filter element.

Device for lateral flow charging of an extruder in which material is fed to at least one conveyor screw disposed in an extruder housing. The material contains gaseous concomitant materials, wherein a degassing housing for receiving an air flow is disposed on the extruder housing, which air flow acts in the extruder housing and which is directed contrary to the conveying direction of the conveyor screw.

A sealing device for sealing a venting port of an extrusion apparatus. The sealing device includes a saddle having a saddle counter bore and a seal ring positioned in the saddle counter bore of the saddle. The sealing device also includes a barrel counter bore provided in a barrel of the extrusion apparatus. The saddle counter bore and the barrel counter bore are dimensioned to receive the seal ring, wherein when the seal ring is positioned in the saddle counter bore and the barrel counter bore, a seal is formed between the seal ring in all range of processing temperatures, the saddle and the barrel to prevent the unwanted leakage of high pressure melt.

A stuffing screw (2) for use in an extruder system comprises a housing (7) and at least one conveying screw (5), which is mounted in a rotatable manner within the housing (7), wherein a conveying space is formed between an inner side of the housing (7) and the conveying screw (5). The stuffing screw (2) is characterized in that at least one portion of the inner side of the housing (7) is provided with one or more depressions, in particular in the form of a groove (13).

The present invention relates to a process for devolatilising polymer-containing media such as, in particular, polymer melts, polymer solutions and dispersions and also devolatilisation apparatuses for carrying out the abovementioned process.

A processing installation for the processing of bulk material has a vacuum filter insert for degassing of the bulk material. The vacuum filter insert is arranged in a casing of a screw machine downstream of the feed opening thereof and is provided with at least one filter element so that the vacuum filter insert forms a gas-permeable wall portion which defines the at least one casing bore of the screw machine. Seen in a degassing direction, a protective element comprising a plurality of through-openings is arranged upstream of the at least one filter element. The protective element acts as a granule protection for the at least one filter element and prevents granular bulk material from damaging the at least one filter element. As a result, the vacuum filter insert has a longer service life, thus ensuring a long operating time for the processing installation without interruptions.

A method for extruding thermoplastic molding compounds, the production of thermoplastic molding compounds taking place in a screw machine with mechanical dewatering, and impact-modified molding compounds or polymer blends which contain impact-modified thermoplastic materials that were produced by means of the method according to the invention.

An extruder screw includes a screw main body, conveyance portions, barrier portions, and paths. The raw materials, the conveyance of which is limited by the barrier portions, flow in from the entrance. The raw materials flowing in from the entrance flow through the paths in an opposite direction to a conveyance direction of the conveyance portions. The exit is opened in the outer circumferential surface of the screw main body at a position on an upstream side in the conveyance direction in the conveyance portions in which the entrance is opened.

The present invention relates to a process for devolatilising polymer-containing media such as, in particular, polymer melts, polymer solutions and dispersions and also devolatilisation apparatuses for carrying out the abovementioned process.

Techniques recycle plastics in multiple successive process steps. A polymer, preferably a recyclable material, is melted using a discharge extruder, filtered using a first filter device under a positive pressure atmosphere, filtered and degassed using a degassing device, and discharged using a discharge extruder. The degassing device has at least one filter element and a vacuum chamber with a negative pressure atmosphere for filtering and degassing purposes, wherein the plastic melt can be conducted into the negative pressure atmosphere of the vacuum chamber through the filter element.