Abstract:
An extrusion head of an extruder is configured to move along a feedpath independently from a heating element so that the extrusion head can yield to extrusion-related forces. Specifically, the extruder may include an extrusion head movably coupled to a thermal core to permit axial displacement of the extrusion head relative to the thermal core. In use, the extrusion head may be displaced within the thermal core when the extruder is subject to extrusion-related forces (e.g., an upward force created by a retraction of build material or a downward force created by an advance of build material). This motion can facilitate better transitions by the extruder between different layers or z-axis positions in a model during fabrication.
Abstract:
An apparatus (1700) for forming a conduit having at least one strip- shaped substrate (1111) dividing the conduit into channels. The apparatus (1700) contains an extrusion die having an exit and defining a flow direction for polymeric material forming the conduit. The extrusion die contains a first point for the introduction into the extrusion die of polymeric material forming a first (1100) st polymeric layer of the conduit, a second point for the introduction into the extrusion die of polymeric material forming a second polymeric layer of the conduit, and a slot within the extrusion die having a thickness, a width, a first edge, and a second edge. The slot is configured for receipt of a strip-shaped substrate and extends in the flow direction along the extrusion die. The thickness of the slot varies along the width of the slot and the thickness of the slot is greatest at the first edge and second edge of the slot.
Abstract:
A ribbon liquefier (38) comprising an outer liquefier portion (66) configured to receive thermal energy from a heat transfer component (40), and a channel (72) at least partially defined by the outer liquefier portion (66), where the channel (72) has dimensions that are configured to receive a ribbon filament (44), and where the ribbon liquefier (38) is configured to melt the ribbon filament (44) received in the channel (72) to at least an extrudable state with the received thermal energy to provide a melt flow. The dimensions of the channel (72) are further configured to conform the melt flow from an axially- asymmetric flow to a substantially axially-symmetric flow in an extrusion tip (52) connected to the ribbon liquefier (38).
Abstract:
Zur Herstellung eines mit Lang- oder Endlosfasern verstärkten Kunststoffs, bei dem Faserstränge (8) von unbewegten Spulen (9, 10) abgewickelt werden, sind die Faserstränge (8) auf die Spulen (9, 10) mit Verdrehungen (13) aufgewickelt worden.
Abstract:
The invention relates to a feed roll assembly for reducing leakage of an elastomeric material in a feed section of an extruder machine. A shell (402), feed roll seal plates (412), and feed roll end plates (422) are used to reduce the leakage of elastomeric material. Elastomeric material is redirected back to the feed section through the use of a varying bore diameter (408, 500, 502) of the shell and grooves (420, 428) contained in both the feed roll seal plates and the feed roll end plates. The shell, feed roll seal plates, feed roll end plates, and a feed roll scraper (320) are each coated with a solid, dry lubricant coating to reduce friction. The invention provides desirable feedback of overflow elastomeric material and permits a retrofitting of the feed roll assembly to existing extruder machines.
Abstract:
A hardness taper tube which is enhanced in a joint strength at a transition portion between resins with different hardnesses and in usability due to a shortened transition portion, and which is restricted in heat-caused quality degradation due to a reduced retention volume at switching; a production method and production device therefor. A production device (1) for a hardness taper tube having a die (3) provided with a extrusion hole (2), a die holder (4) for holding the die (3), and a mandrel (5) mounted in the die holder (4) and engaging in the extrusion hole (2), the die holder (4) being provided with a plurality of resin supply ports (8, 9), wherein a mandrel insertion hole (6) communicating with the extrusion hole (2) is formed in the die holder (4), the mandrel (5) is fitted in the mandrel insertion hole (6), the plurality of resin supply ports (8, 9) are opened, at a position spaced apart from the extrusion hole (2) in the die (3), to a cylindrical space (7) formed between the inner surface of the mandrel insertion hole (6) and the outer surface of the mandrel (5), and a plurality of kinds of resin merge in the space (7).
Abstract:
Method of dosage and mixing of solid particles to non-vulcanized rubber or other polymeric materials. A stud extruder is utilized as a mixing unit, wherein the quantity of rubber or polymer added is measured continuously, and the particle quantity supplied to the extruder is measured continuously in relation to the consecutive quantity of rubber or polymer added. The method is particularly applicable to the addition of abrasive particles to rubber for the production of friction tyres or antiskid soles for shoes.
Abstract:
A composite pipe and a manufacturing method for the same are disclosed. The composite pipe for replacing carbon steel pipes for ordinary piping or copper pipes for air-conditioner includes: a first resin layer ( 1 ) formed by cross-linking a resin and giving a polar group thereto; a first bonding layer (2) for inducing bonding by sharing radical groups of the first resin layer and a metal layer; the metal layer (3); a second bonding layer (4) for inducing bonding by sharing radical groups of the metal layer; and a second resin layer (5) formed by cross-linking a resin and giving a polar group thereto, thereby integrating the layers chemically and physically.
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).