Abstract: An extruder apparatus has an extruder flow channel 10 for an extruder head having a pair of flow passages 40, 50 and a flow dam 12 interposed between the flow passages and a flow splitter 14 that locally increases or locally decreases the flow area of the first flow passage 40 relative to the second flow passage 50. The preferred flow channel 10 adjusts the mass balance of the flows 6, 7 between passages 40, 50 automatically.

Abstract: An extruder flow channel 10 has a pair of flow passages 40, 50 and a flow dam 12 interposed between the flow passages and a flow splitter 14 that locally increases or locally decreases the flow area of the first flow passage 40 relative to the second flow passage 50. The preferred flow channel 10 adjusts the mass balance of the flows 6, 7 between passages 40, 50 automatically.

Abstract: The flow regulation portion includes a diameter reducing portion, a cylinder portion and a diameter expanding portion arranged from an upstream side, wherein: (1) an inlet shape of the diameter reducing portion at a side of the biaxial screw portion is equal to an outlet shape of the biaxial screw portion; (2) an outlet shape of the diameter reducing portion at a side of the cylinder portion is equal to an inlet shape of the cylinder portion; (3) an inlet shape of the diameter expanding portion at a side of the cylinder portion is equal to an outlet shape of the cylinder portion; and (4) an outlet shape of the diameter expanding portion at a side of the foreign substance removal portion is equal to an inlet shape of the foreign substance removal portion. The flow regulation portion is formed by a cassette mechanism, thereby reducing a maintenance cost and a delivery date.

Abstract: A method and apparatus for extruding plastic products having large cross sections, which require a correspondingly large die cross section, is described in which the cross section of the die is divided into regions of predetermined flow and separate flow streams are supplied to each region in proportion to the relative size of the flow region to the overall die cross section.

Abstract: A continuous, friction-actuated extrusion apparatus, comprised of a cylindrical first member having a circumferential groove formed in its peripheral surface. A stationary second member projects into the groove and defines a passageway between the first member and the second member, the passageway having an entry end and an exit end. A metal feeding device for feeding metal into the passageway at the entry end as the cylindrical first member rotates toward the exit end. An abutment member extends across the passageway at the exit end and at least one die orifice is located at the exit end of the passageway. At least one restriction member is located in the passageway between the orifice and the entry end, the restriction member constricting the passage for a portion thereof.

Abstract: Improved batch uniformity delivered to the discharge slots of an extrusion die is obtained by providing a stressor component of reduced cross-sectional area from the feedholes which suddenly increases the linear flow velocity due to its reduced cross-sectional area, and then just as suddenly restores the original flow conditions as it exits the stressor component into a larger diameter channel. A rapid change in particle alignment, due to the cross-sectional flow change, produces a shearing influence on the batch, and functions to produce a more uniform flow as it enters the discharge slot sections of the extrusion die.

Abstract: An extrusion die for extruding an extrudable fluid comprises a distribution channel having a discharge mouth, and a dynamic flow inducer disposed therein. The dynamic flow inducer comprises a movable member, such as, for example, a rotatable bar disposed transversely relative to the flow of the fluid through the discharge mouth. As the extrudable fluid is passing through the discharge mouth, the motion of the dynamic flow inducer retards the accumulation of contaminant and thereby prevents clogging of the extrusion die.

Abstract: An extrusion head for blow molding extruded plastic containers, with a ring gap nozzle having a mandrel and a ring-shaped nozzle body having an elastically deformable sleeve, and setting devices for radially deforming the elastic sleeve. The sleeve defines a nozzle gap, the width of which is variable by axially movement of the mandrel and/or of the nozzle body. The geometry of the gap can be changed by deforming the sleeve in the course of extrusion of a hose-like, pre-shaped blank. The sleeve is axially supported in the nozzle body, and/or on the mandrel only on segment-like surfaces.

Abstract: A membrane assembly for an extrusion die includes a membrane having a deformable main portion and first and second mounting arms integral with the main portion and disposed on opposite sides thereof. The main portion includes a first face and the mounting arms extend away from the first face. The main portion, the mounting arms and a second face opposite the first face form a recess on a side of the main portion opposite the first face and a backing member is disposed in the recess between the mounting arms.

Abstract: A method and an apparatus capable of extrusion molding a comparatively wide, thin ceramic sheet using a screw extruder while suppressing the wrinkling thereof are disclosed. A molding apparatus (1) comprising a screw-type extruder (2) and a mold (11) at the forward end of the extruder (2) is used to extrusion mold a ceramic sheet from the ceramic material introduced into the extruder (2) by way of the mold (11). The extrusion molding is carried out while regulating the temperature of the portion of the ceramic material passing through the mold (11) corresponding to each of a plurality of areas (control zones) into which the mold (11) is divided.

Abstract: A pipe molding die of the present invention is capable of rectifying a flow of a molten resin by a resin reservoir and uniformizing the flow of the resin extruded from the die in whichever position in a peripheral direction on a flow path within the die. Consequently, ununiformity in wall thickness of the resin pipe to be molded can be eliminated. The pipe molding die comprises a throttle part as one of components thereof, which includes a core, a shell part fitted to the core and a resin reservoir as a portion of a flow path which is formed between the core and the shell part. A molten, resin as a pipe raw material flows through the flow path. The resin reservoir is provided in at least one of the core and the shell part, and takes a ring-like shape circumscribing a central axis of the pipe molding die with the central axis centered. The resin reservoir assumes a recessed shape in cross-section.

Abstract: The invention provides systems, methods, and articles useful in the production of foams, and, in particular microcellular foams. The systems include a restriction element that reduces the backflow of polymer melt in an extruder while polymeric material is injected into a mold or ejected from a die. The restriction element is positioned upstream of a blowing agent injection port to maintain the solution of polymer and blowing agent in the extruder above a minimum pressure throughout an injection or ejection cycle, and preferably above the critical pressure required for the maintenance of a single-phase solution of polymer and blowing agent. The systems can be used in injection molding, blow molding, or in any other processing techniques that include injection or ejection cycles. In some embodiments, the systems utilize reciprocating screws for injection or ejection.

Abstract: An extrusion die for making shaped extrudate products has structure which defines a central duct which is convergent from a duct inlet opening to a duct outlet opening and has structure which defines a tubular extrusion duct co-axial with the central duct and which also is convergent from a duct inlet opening to a duct outlet opening. A feed diaphragm member has a portion which converges to an opening which opens to a distribution chamber which diverges so that substance being extruded is distributed to the central and tubular ducts. Diaphragms are provided in the ducts to delimit passage of extrudate substance into the ducts. Additionally, members are provided for altering the position of the central duct and its duct outlet relative to the second duct member and its outlet.

Abstract: A process for manufacturing an expanded cereal with the overall shape of an array of touching balls and an extrusion die and an extruder for use with the process. The die includes a feed ring for receiving material from an extruder, a cylindrical distribution chamber having a front wall and rear wall which includes the feed ring, and an array of parallel extrusion tubes provided in the front wall of the distribution chamber. The feed ring is in communication with the array of parallel extrusion tubes through the distribution chamber. The distribution chamber also includes a cylindrical distribution insert that extends axially from the center of the feed ring towards the front wall but spaced from the array of extrusion tubes. The process involves cooking and extruding a mixture of starchy material, sugar, oil, and water in a cooker-extruder and forcing the cooked material through the extrusion die.

Abstract: An apparatus and method for manufacturing an extruded cooked food product including use of an extruder having a barrel, at least one screw contained therein, a feed element at the discharge end of the screw, and a die head containing an expansion chamber. The discharge feed element is formed with a large pitch for pushing a large volume of cooked food mix into the expansion chamber. The large volume of cooked food mix is extruded as extrudate strands through relatively large orifices extending through the die plate of the die head to dimensionally expand upon exiting the orifices. The extrudate strands are conveyed over a sole support bar located a significant distance from the die head and then to a cutter. An air flow is applied to the extrudate strands for further cooling and drying before being cut. The cutter is located approximately 90 inches from the die head. The extruded food product is uniform in cross-section.

Abstract: The present invention is a continuous process of producing an object with radially-varying material properties. These objects can be cylindrical forms made from polymeric materials. This process requires a novel device. The device can be used to produce high bandwidth gradient-index plastic optical fiber (GRIN-POF). This fiber is highly advantageous for use in high speed local area networks (LANs) as well as other short-range optical communication applications. The device can also be used to produce GRIN lenses which can be used in the focusing and transmission of images.

Abstract: Candy mass including sugar and starch syrup is passed through a nozzle to which twisted-blades are mounted by a pair of a piston and a deposit cylinder for deposit, the candy mass being poured into a die. Consequently, candies having a beautiful marble pattern can be produced continuously.

Abstract: An adjustable variable flow restriction element and an extruder containing the same are provided for mechanically controlling the bulk density of an extruded material. The adjustable flow restriction element is located in an extruder proximate to the die of the extruder in position to partially block the downstream flow of material through the extruder. The adjustable flow restriction element is structured to be capable of assuming one of a plurality of uniquely flow restrictive positions, where the degree of restriction of flow controls the bulk density of an extruded material. A method of mechanically controlling the bulk density of an extruded material by restricting the flow of the material through an extruder is also provided.

Abstract: A pipe molding die of the present invention is capable of rectifying a flow of a molten resin by a resin reservoir and uniformizing the flow of the resin extruded from the die in whichever position in a peripheral direction on a flow path within the die. Consequently, ununiformity in wall thickness of the resin pipe to be molded can be eliminated. The pipe molding die comprises a throttle part as one of components thereof, which includes a core, a shell part fitted to the core and a resin reservoir as a portion of a flow path which is formed between the core and the shell part. A molten resin as a pipe raw material flows through the flow path. The resin reservoir is provided in at least one of the core and the shell part, and takes a ring-like shape circumscribing a central axis of the pipe molding die with the central axis centered. The resin reservoir assumes a recessed shape in cross-section.

Abstract: An extruder assembly for an injecting moulding machine in which the screw point pin has a small diameter that can float and is self-centering. The pin has two support points or flats. The screw point and pin are used as a check valve in front of the piston screw of an injection molding machine for plastic materials. As a result of the small diameter of the pin the total output of plastified material is not diminished and there are no head losses. The screw point can be adapted to any models of injection molding machine, and its technical advantages give it high performance both in the field of what are known as “technical” molded parts and in the field of high-speed packaging.

Abstract: A flexible membrane is attached to a holder for controlling flow in an extrusion die. The membrane includes a horizontal portion, first and second curved portions adjacent the horizontal portion, first and second offset portions adjacent the first and second curved portions, and first and second edges adjacent the first and second offset portions. The membrane is formed of a single piece of material. The flow control device including the flexible membrane may be produced by fabricating a membrane holder from a material, fabricating a flexible membrane from the same material, joining the flexible membrane to the membrane holder, and hardening the membrane holder and membrane.

Abstract: Broad parts are formed on at least one passage including a passage for forming the thinnest layer among passages for respective resin layers of a multilayer sheet at an upstream side of a confluence. In the broad parts, clearances become larger to both ends of the passage along the width thereof.

Abstract: An extrusion die with a plurality of die layers stacked one upon the other in a direction generally parallel to the central axis. Each of the layers has an annular flow distribution ring having an outer generally cylindrical surface and an annular feed ring surrounding and engaging the outer surface of the distribution ring. At the engaged surfaces of the feed and distribution ring, the flow from the feed ring is divided into a number of substantially equal flow portions. Seals between adjacent engaged surfaces confine the flow to between the circumferential surfaces of the feed and distribution ring. Half of the flow portions are directed to a recombination region on one side of the distribution ring, and half are directed to a recombination region on the other side of the ring. In recombining, weld lines are formed in high flow areas to minimize the deleterious effect of polymer degredation.

Abstract: An extrusion die for extruding biodegradable material, the extrusion die including: a mandrel; an outer member positioned near the mandrel; an extrusion orifice between the mandrel and the outer member; a member in communication with at least one defining member of the extrusion orifice, wherein the member is capable of producing relative movement between the outer member and the mandrel, wherein the relative movement has a component transverse to an extrusion direction of biodegradable material through the extrusion orifice; a flow control device which controls flow of biodegradable material through the extrusion die; and a positioning device which positions the outer member and the mandrel relative to each other.

Abstract: The present invention relates to a process of paste extruding lubricated PTFE fine powder in an extrusion device by forcing the lubricated PTFE fine powder through the extrusion device and out of an orifice as a lubricated green extrudate, wherein before exiting through the orifice, the direction of the flow of the lubricated PTFE fine powder in the extrusion device is reoriented in a direction at least 60 degrees different from the initial direction of the flow of the lubricated PTFE fine powder through the extrusion device.