摘要:
Apparatus (1) for admixing additives to a medium to be pumped, comprising at least one gear pump (2) for pumping a medium to be pumped, said gear pump (2) comprising at least one shaft (3) having a first driving torque; at least one injector (5) for introducing an additive into a medium to be pumped; at least one screw conveyor (6) for mixing said additive with said medium to be pumped, said screw conveyor having a second driving torque, and, characterized in that, the shaft (3) and the screw conveyor (6) are functionally connected, such that the first driving torque and the second driving torque are coupled.
摘要:
An extruder (10) including a devolatilizing section (14) having helical channels (28) formed in the barrel (26) and having a cylindrical rotor (31) closing the inner sides of the channel (28). Material is fed onto the rotor surface (36) which rotates and forms the material into one or more rolling banks (65) engaging only the upstream flank (34) of the channels (28) and the rotor surface (36). Helical vent slots (40) pass through the barrel (26) into each channel (28) at the downstream flanks (33) not occupied by the rolling bank (65).
摘要:
Bei einer Vorrichtung zum Zuführen von Granulat und Füllmaterial zu einer Extruderschnecke (11) eines Extruders, ist ein Zyklon (12) mit einer Eintragsöffnung zum Einbringen eines Förderstroms von pneumatisch gefördertem Füllmaterial und einer Austragsöffnung (16) zum Austragen des aus dem Förderstrom abgeschiedenen Füllmaterials, ein Aufgabetrichter (1) für das frische Granulat und eine Mischstrecke (9) vorgesehen, der das abgeschiedene Füllmaterial und das frische Granulat aus dem Aufgabetrichter (1) zugeführt sind. Der Zyklon (12) ist zumindest teilweise im Aufgabetrichter (1) und koaxial zu diesem angeordnet ist, sodass die Austragsöffnung (16) des Zyklons (12) in einen die Austragsöffnung (16) ringförmig umgebenden Austragsbereich (6) des Aufgabetrichters (1) eintaucht, wobei eine Stopfschnecke (19) die Austragsöffnung (16) des Zyklons (12) axial durchsetzt und zumindest teilweise in die an die Austragsöffnung (16) axial anschließende Mischstrecke (9) hineinragt.
摘要:
Polymeric composite materials, particularly highly filled polyurethane composite materials are described herein. Such highly filled polyurethane composite materials may be formed by reaction and extrusion of one or more polyols, one or more di- or poly-isocyanates, and from about 45 to about 85 weight percent of inorganic filler such as fly ash. Certain polyols, including plant-based polyols can be used. Certain composite materials also contain chain extenders and/or crosslinkers. The polyurethane composite material may also contain fibers such as chopped or axial fibers which further provide good mechanical properties to the composite material. Shaped articles containing the polyurethane composite material have been found to have good mechanical properties, such that the shaped articles are suitable for building applications.
摘要:
Extrusion of a mix containing a pharmaceutically active agent can be achieved using a plasticising excipient in an amount sufficient to act as plasticiser and also act as lubricant, thereby avoiding the need for inclusion of a lubricant. The invention provides multiparticulates with controlled release properties, substantially free of lubricant.
摘要:
The invention concerns a device for producing polymer pellets, extruded profiles or mouldings, comprising an extruder for producing a polymer melt, comprising a melt pump (2) for building up pressure for the purpose of forcing the polymer melt through a die and comprising the die for creating the pellet, the extruded profile or the moulding, wherein the melt pump (2) is formed separately from the extruder and has a drive (5) of its own. Providing such a device for producing polymer pellets, extruded profiles or mouldings in which the extruder does not need a pressure increasing unit is achieved by the transfer of the polymer melt from the extruder to the melt pump (2) taking place in a pressureless or almost pressureless manner.