Abstract:
A method of feeding a composite molten resin capable of easily forming amulti-kind-multi-layer preform. An apparatus for feeding the composite molten resin has a nozzle portion which includes an outer discharge port in which an outermost annular flow path through which a main layer-forming molten resin flows, meets an outer annular flow path through which a sub-layer-forming molten resin flows inside of the outermost annular flow path; and an inner discharge port in which a shell layer-forming molten resin annularly flowing inside of the outer conflux path, meets the core layer-forming molten resin flowing inside the shell layer; the outer discharge port and the inner discharge port being arranged in this order from the downstream toward the upstream in a direction in which the molten resins flow; wherein provision is made of a shaft-like opening/closing valve for opening and closing the inner discharge port, and a gear pump for intermittently discharging the sub-layer-forming molten resin.
Abstract:
To provide a cannula device (4) with an implant (3), the cannula device (4) is held at an extrusion die in such a way that the cannula device (4) is in contact with a sealing surface of the extrusion die. A flowable implant material is conveyed through the extrusion die into an implant channel (10) of the cannula device (4). The implant material solidifies in the implant channel, for example by means of cooling.
Abstract:
A pump system (10) comprising a delivery assembly (22) configured to feed a solid material under operational power of a first drive motor (16), and a screw pump (24) comprising a housing (84) that at least partially defines a barrel (106) of the screw pump (10), an extrusion tip (82) secured to the housing (84) at a first end of the barrel (106), a liquefier (85, 342) secured to the housing (84) and intersecting with the barrel (106), and an impeller (94) extending at least partially through the barrel (106). The liquefier (85, 342) is configured to receive the solid material fed from the delivery assembly (22), to at least partially melt the received solid material, and to direct the at least partially melted material to the barrel (106), and the impeller (94) is configured to drive the at least partially melted material that is directed to the barrel (106) toward the extrusion tip (82) under operational power of a second drive motor (18).
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von rohrförmigen Kunststoffprofilen, deren Dimension sich über die Länge ändert. Aufgabe der Erfindung ist es, eine neue Fahrweise für eine für einen Dimensionswechsel im laufenden Betrieb ausgelegte Extrusionslinie zur Verfügung zu stellen. Diese Aufgabe wird dadurch gelöst, indem eine Rohrextrusionslinie mit einem Extruder (1), einer stufenlos auf verschiedene Durchmesser einstellbaren Kalibrierhülse (10) und einer Abzugseinheit (7) mit regelbarer Abzugsgeschwindigkeit verwendet wird und wobei in festgelegten Zeitintervallen die Kalibrierhülse (10) abwechselnd auf- und zugefahren wird und/oder gleichzeitig die Abzugsgeschwindigkeit verringert bzw. erhöht und/oder gleichzeitig der Massendurchsatz durch den Extruder (1) verringert bzw. erhöht wird.
Abstract:
A method for forming a molded polymeric part comprising introducing polymeric material admixed with supercritical fluid into a mold including a portion having an interior dimension of less than 3.17 mm (0.125 inch) and allowing the polymeric material to solidify in the mold.
Abstract:
An extrusion control system for use with one or more extruders has a data acquisition module in communication with one or more data acquisition nodes that are associated with an extrusion process. A control module is also in communication with one or more control nodes associated the extrusion process. A synchronization signal to one or more control nodes causes the nodes to adjust to a predetermined setting.