Abstract:
Die vorliegende Erfindung betrifft einen Einschneckenextruder mit einem genuteten Einzugssystem, einem Zylinder und einer in dem Zylinder drehbar gelagerten Extruderschnecke, die eine Erweichungszone (10), eine Hauptplastifizierzone (14) sowie eine Nachplastifizierzone aufweist und im Bereich der Hauptplastifizierzone (14) wenigstens zweigängig (18, 20) ausgestaltet ist. Um einen solchen Einschneckenextruder bereitzustellen, der eine verbesserte Aufschmelzwirkung bei gleichzeitig erhöhtem Durchsatz, verringerter Schmelzetemperatur und verbessertem Druckaufbauvermögen ermöglicht, weist der Zylinder im Bereich der Hauptplastifizierzone (14) erfindungsgemäß wenigstens teilweise mindestens eine im Wesentlichen in Längsrichtung verlaufende Nut auf.
Abstract:
A process for preparing a blend of thermoplastic polymer and resin modifier within a single- screw extruder, wherein the resin modifier is a hydrocarbon resin. The single-screw extruder is designed to have a screw with a compression ratio of at least 1.2. The compression ratio is the ratio of the screw depth at the feed section (30) to the screw depth at the metering section (34).
Abstract:
A closed - section beam element is provided, especially in a form of a tubular beam, manufactured of composite material containing comminuted and/or broken-up filing material, mainly wooden chips and particles, and thermosetting resin, wherein said beam element has generally of longitudinal shape and having cross section of its external contour of any polygonal shape, or a circular or oval shape and/or of any irregular shape, preferably provided with projections and/or recesses arranged over the external surface of said beam element, and additionally said beam element has a central through opening forming an internal through channel, preferably of a circular cross section, wherein surface of the internal through channel is provided with a continuous contour of at least one screw or spiral line in relation to a centre axis of said beam element and extending, preferably, along full length of the internal channel along its central axis. A method and extrusion device for manufacturing of said closed-profile beam elements from said composite material is also provided.
Abstract:
An extruder configuration system is disclosed. The system includes an extruder information database including details of extruders, extruder elements and extruder barrels, a user interface configured to receive user inputs including user choices of extruders, extruder elements or extruder barrels from the extruder information database, the user interface further configured to receive extruders, extruder elements or extruder barrels for addition to the extruder information database, an element positioning engine including a database of incompatible elements and configured to review user choices and prevent positioning of incompatible extruder elements adjacent to each other on an extruder, a processor configured to create an extruder configuration based on user inputs and a display module configured to display the extruder configuration.
Abstract:
Ein Extruder mit einem Gehäuse mit wenigstens zwei gleichsinnig antreibbaren achsparallelen Wellen ist mit wenigstens zweigängigen, miteinander kämmenden Förderelementen (2, 11, 12, 21, 22, 31, 32, 41, 42, 43, 50, 51, 52, 53) versehen, die sich gegenseitig in einem Achsabstand (Ax) mit geringem Spiel am ganzen Umfang abstreifen, wobei zwischen dem Kamm (6, 6') des wenigstens einen weiteren Ganges und der Innenwand (1) des Gehäuses ein Abstand (a) besteht. Jedes Förderelement (2, 11, 12, 21, 22, 31, 32, 41, 42, 43, 50, 51, 52, 53) weist wenigstens zwei im Winkel verdrehte Förderabschnitte (3, 4; 11a bis11f, 12a bis 12f; 21a bis 21e, 22a bis 22e; 31a bis 31e, 32a bis 32e; 41a bis 41e; 50a bis 50e; 51a bis 51e; 52a bis 52e; 53a bis 53e) auf, wobei jeder Förderabschnitt eine axiale Länge (Ls) besitzt, die höchstens dem Außendurchmesser (Da) des Förderelements (2, 11, 12, 21, 22, 31, 32, 41, 42, 43, 50, 51, 52, 53) entspricht.
Abstract:
Disclosed is a process for a melt processing a polyethylene terephthalate. The polyester particles have at least two melting peaks. The polyester particles may have an It. V. at their surface which is less than 0.25 dL/g higher than the It. V. at their center. The polyester particles may have not been solid stated. The melt processing device comprises a screw with a total length (9), L, a feed zone length (3) in the range from 0.1 SL and 0.45L, a taper angle, in the range from 0.5 degrees and 5.0 degrees and a compression ratio, CR, in the range from 2.0 and 5.0.
Abstract:
The invention relates to screw elements for multi-shaft screw-type machines comprising screw shafts that co-rotate in pairs and accurately wipe in pairs. The sum of all ridge angles of a pair of screw elements is greater than or equal to 0 and smaller than 2*pi-8*arccos (0.5*a/ra), the number of ridge regions of a pair of screw elements is greater than 4, each screw element of a pair of screw elements has two profiled screw regions that consist of flank regions and channel regions, and the sum of the flank angles and channel angles is greater than pi/2. The invention also relates to the use of said screw elements and an extrusion method.
Abstract:
The invention relates to a twin screw extruder (10) for preparing a polymeric solution. The extruder includes an elongated housing (16) having an inlet end (18), an outlet end (20), an extruder shaft length L and a pair of interconnecting bores (22) disposed within the housing, a pair of elongated extruder shafts (34), each having an axis of rotation, the pair of elongated extruder shafts disposed within the pair of interconnecting bores and drivable in at least one direction of rotation, a plurality of extruder screw segments positioned along the pair of elongated extruder shafts in a fixed angular relationship therewith, the plurality of extruder screw segments selected to form multiple extruder stages. The invention also relates to a process for extruding a mixture of polymer and diluent.