Abstract: Co-extrusion apparatus for manufacturing a laminated plastic film or sheet comprises a plug-type layer sequencer including a plurality of channels for conducting a plurality of polymer flows; a transitional aspect ratio block for inducing the plurality of polymer flows to converge; and a flow velocity profiler cartridge for combining the plurality of polymer flows to form the film. In accordance with one embodiment, the layer sequencer includes a tapered selector pin which minimizes mechanical damage when the selector pin is removed. In accordance with another embodiment, the flow velocity profiler cartridge includes inserts fitting within cavities for controlling the polymer flows which form the layers of the film or sheet manufactured by the apparatus. At least one such insert defines lanes within an associated cavity so as to promote the formation of lanes of differing polymer composition within at least one layer of the laminated sheet or film.

Abstract: A dose of multilayer synthetic resin for the realization of multilayer objects by compression molding, said dose having an axis of symmetry and comprising a first synthetic resin (2) and at least one fine functional layer (3) of synthetic resin forming the outer shell of a body of revolution defined about said axis of symmetry, said body of revolution comprising two ends disposed in a direction parallel to the axis of symmetry, said dose being characterized in that the functional layer (3) is imprisoned in said first synthetic resin (2), totally or in such a way that no more than a single one of said ends is not imprisoned in said first resin (2).

Abstract: The present invention relates to a process for the production of an absorbing sanitary article comprising lactic acid producing bacteria. The process comprises dispersion of lactic acid producing bacteria in a carrier, and application of the resulting dispersion of bacteria by continuous or discontinuous gentle feeding on and/or in at least one component that are to form part of the final article. Furthermore, the present invention relates to an absorbing sanitary article comprising lactic acid producing bacteria dispersed in an essentially hydrophobic carrier. The dispersion of bacteria forms at least one continuous or discontinuous string on and/or in the final sanitary article.

Abstract: An extrusion head configured for at least one extruder includes a flow channel a finishing die; and an opening in operative communication with the flow channel, wherein the opening is configured to at least partially accommodate a screw shaft of an additional extruder.

Abstract: A dose, having an axis of symmetry, for the realization of multilayer objects by compression molding, comprising a first synthetic resin and at least one fine layer of functional resin imprisoned at least largely in the resin wherein a part of its surface is concave.

Abstract: A nozzle for extruding cementitious material may include an outlet sized and configured to extrude the cementitious material, a material flow pathway configured to channel the cementitious material to the outlet, and a vibration-actuated valve interposed in the material flow pathway. The valve may include a plurality of spaced-apart plates configured to form a plurality of flow channels, and a vibration-generating device coupled to the plates and configured to controllable cause the plates to controllably vibrate.

Abstract: The invention relates to a method for extruding curved extruded profiles. The extruded profile is formed in a matrix mounted upstream in a counter beam of an extruder system and is subsequently curved or bent due to the effect of external forces and separated, supported and arranged into partial lengths in the extrusion flow by means of a separating robot connected to a higher control mechanism and is discharged to a storage area with the aid of a handling robot. The handling robot is coupled to the separating robot by means of the control mechanism and, like the separating robot, is moved into a starting position in front of the extrusion press.

Abstract: An extrusion-molding apparatus for a loose tube includes: an extrusion head that includes a tip and a die concentrically arranged therewithin and extrudes a tube between the tip and the die; a needle that feeds at least one optical fiber and filler to be filled around the optical fiber into the tube being extrusion-molded; and a cylindrical bundling member provided within the needle. The bundling member has a bundling hole being smaller than an inner diameter of the tube at a center thereof and into which the optical fiber can pass through, and a flow pass penetrating along a feeding direction of the filler between the bundling hole and an inner circumferential surface of the needle. In an extrusion molding method using the extrusion-molding apparatus, the optical fiber is passed through a bundling hole to be bundled at an almost center of the tube. In addition, filler is passed through a flow path to be filled around the optical fiber.

Abstract: An extruded profiled element, based on a cross-linkable rubber composition, is delimited in width by two lateral faces which connect radially inner and outer faces to one another for the tread. A conducting element is provided in the profiled element to connect the inner face electrically to the outer face between the lateral faces and all along the length of the profiled element. The remainder of the profiled element is based on an electrically insulating material. When the profiled element is viewed in cross-section, the conducting element has a layered structure including electrically conducting layers which are essentially concentric and which have a curvature towards at least one of the inner and outer faces, with at least one of the layers emerging at the surface of the outer face.

Abstract: Apparatus for multiplying layers in a composite polymer stream includes an intermediate section having open conduits sandwiched between housing sections that close the conduits. The conduits have respective first stages separated by a first blade extending to a first face, and respective second stages separated by a second blade extending to a second face. The first stages separate the stream into sub-streams and compress and shift the sub-streams in a first dimension, whereas the second stages shift the sub-streams in a second dimension. In order to maintain a constant cross-sectional area of the sub-streams, the housing sections may be provided with complementary open channels. The apparatus can be used to multiply layers which are side-by-side or one-over-another by changing orientation in the direction of flow.

Abstract: A liquid phase continuous reactor which includes a screw rotatably disposed within a barrel and defining a mixing zone therebetween whereby the relative rotation of the screw with respect to the barrel is adapted to axially transport materials disposed between the screw and the barrel while mixing the components wherein the land surface area between the spiral groove forms at least 50% of the surface area of the screw in a mixing zone.

Abstract: An extrusion apparatus for extruding multiple streams of extrusion material as extruded end-products and in the coating of substrates. A flow joiner in an extrusion head combines multiple metered streams such as from a gear pump, into a uniform extrusion flow.

Abstract: A die for coextruding a plurality of fluid layers includes one or more distribution plates for forming relatively thick layers, and a microlayer assembly for forming a plurality of microlayers. The die further includes internal fluid passages and/or forming surfaces to allow the microlayers to assemble into a microlayered fluid mass prior to merging with the relatively thick layers from the distribution plates.

Abstract: A melt distribution block for a co-extrusion die has a generally annular body with opposed front and rear faces and opposed inner and outer faces. Inlets at the outer face have channel ports for accepting flow of melted polymer into the distribution block. Flow controlling valves independently control the melted polymer flow through each of the channel ports. Melt flow channels on the front and rear faces between the inner and outer faces are in fluid communication with the channel ports. A thermal insulation layer within the distribution block between the front and rear faces separate all or part of the melt flow channels on the front face from all or part of the melt flow channels on the rear face. The blocks, together with separator blocks, are axially stackable front to rear around a central mandrel to form an extrusion die for making blown films into tubular form.

Abstract: An apparatus for making a shingle, together with the shingle made thereby, is provided, in which one or more thermoplastic materials are extruded or co-extruded to form an extrudate, with the extrudate being cut into a preliminary shingle shape, which is allowed to dissipate heat, and then is delivered to a compression mold, wherein the preliminary shingle shape is compression molded to substantially its final dimensions and is then discharged from the mold and allowed to cool.

Abstract: An unvulcanized rubber extruder that realizes extrusion forming of an unvulcanized rubber extrudate ensuring manufacturing of a high-quality tire without any increase of tire manufacturing steps. In the vicinity of left side end portion, in the drawing, of unvulcanized rubber (A) (rubber chafer part), unvulcanized rubber (B) flows along parallel wall (56) on the downside of main rubber flow channel (34) and flows along second inclined surface (38) on the upside of the main rubber flow channel (34). Simultaneously, apart from the main flow of the unvulcanized rubber (B), portion of the unvulcanized rubber (B) is extruded out in the direction perpendicular to auxiliary rubber flow channel (44) (arrow B direction). Accordingly, in the left side end portion, in the drawing, of unvulcanized rubber (A) (rubber chafer part), it appears that the upside and downside are shut in by the flow of the unvulcanized rubber (B).

Abstract: A method for producing an environment protective foamed thermoplastic resin polymer comprises using an extruder with a helical rod to be driven to rotate. The extruder has a feeding section, a melting section, a mixing section and a heating-shaping section formed therein. The method includes a plurality of steps, in which thermoplastic resin is heated, melted in the melting section and moved into the mixing section, and hollow expansion balls are fed into the extruder to be evenly mixed with the melted thermoplastic resin. Then the hollow expansion balls are slightly heated and inflated, and moved into the heating-shaping section, and then the balls are heated at foaming temperature, foamed and inflated. After being injected through a nozzle, the melted thermoplastic resin and the hollow balls become a foamed thermoplastic resin polymer with a preset thickness and shape.

Abstract: A system and method are presented in which a flow of plastic is extruded to obtain nano-sized features by forming multiple laminated flow streams, flowing in parallel through the system. Each of the parallel laminated flow streams are subjected to repeated steps in which the flows are divided, and overlapped to amplify the number of laminations. The parallel amplified laminated flows are rejoined to form a cumulated laminated output with nano-sized features.

Abstract: Disclosed are expanded polytetrafluoroethylene products, such as porous polytetrafluoroethylene tubes, having high axial tear strength and a process for their production. Each expanded polytetrafluoroethylene product has a microstructure, which comprises fibrils and nodes interconnected with each other by the fibrils, and has an axial tear strength of not lower than 6,000 gf/mm as calculated in accordance with the following formula: L/[T×(V/100)] where L (gf) is an axial tear load, T (mm) is a wall thickness, and V (%) is a volume ratio of resin. The process for the production of the expanded polytetrafluoroethylene product includes a high-speed extrusion step.

Abstract: Apparatus and methods for fabricating food items include extruding a first hot plastic food mass through multiple passages (14) and co-extruding a second hot plastic food mass through a feed stem (22) received in each of the multiple passages (14) and through nozzles (42). Each nozzle (42) includes a first portion (42b) in communication with the feed stem (22) but not the passage (14) and a second portion (42a) in communication with the passage (16) but not the feed stem (22). The nozzles (42) are rotatable in gearing relation with the drive gear (70) of a servomotor (72). The co-extruded ropes are conveyed at a linear speed rate less than or equal to the discharge speed from the nozzles (42), cooled, and cut into individual pieces in the form of peelably separable strands.

Abstract: Techniques for preparing PNCs are provided. In one embodiment, a polymer extruding device may include a barrel configured to accommodate a composite material, a shaft rotatably disposed in the barrel, and a motor coupled to the shaft and configured to rotate the shaft, thereby moving the composite material. The polymer extruding device may further include a die including one or more injectors configured to inject nano particles into the die to cause shear stress to be exerted to the composite material, thereby forming a layer of the nano particles on a surface of the composite material.

Abstract: The invention relates to a method and a device for the production of blow-molded two- or multi-layer containers made of thermoplastic, and a plastic container produced accordingly, having view strips, particularly for storage and for transport of contents. To this end, molten plastic material is deflected in an extrusion head (10) from the inner, natural-colored layer (34) of the tubular preform (18) into the outer layer (36) in a process technical step, and incorporated there, whereby a view strip (24) is formed in the colored outer plastic layer (36).

Abstract: Cylindrical extrusions having multiple colors, capable of serving as parisons for subsequent blow molding operation, are formed in an apparatus in which plastics of each color to be incorporated in the finished product are fed by separate extruders to an extruding head having a stack of cylindrical spools each formed with a number of apertures around their periphery. The apertures in each spool are interleaved with corresponding apertures in the other spool or spools. The interiors of the apertures are fed into a conduit which extends coaxially with the axes of each of the spools so that the outputted plastic has multicolored stripes along its length. In an embodiment in which the spool is rotated in timed relation to the feed from the extruders, the output is twisted along the central axis to form a “barber pole” stripe arrangement. In an alternate embodiment a programming plate is disposed beneath the output.

Abstract: A digital manufacturing system for producing first and second objects comprises a platen, a gantry, a pantograph extrusion head system and first and second sets of extruders. The platen defines a workspace upon which the objects are produced. The gantry defines a headspace displaced from the workspace. The extrusion head system is mounted to the gantry for movement in the headspace. The sets of extruders are connected to the extrusion head system and are configured to deposit extrusion material on the workspace to build the objects. Each set of extruders comprises a first extruder mounted to the extrusion head system; a second extruder mounted to the extrusion head system so as to be actuatable from a first to a second position; and a flexible linkage connecting the extruders. The flexible linkages position the second extruders in approximately equal known spatial relationships to the first extruders in the second positions.

Abstract: A preformed pallet is provided having first and second outer layers that sandwich a cellular or honeycomb shaped core. The peripheral edge of the preformed pallet may be inserted into the molding device having one or more heating elements, which function to focus heat onto the peripheral edge. Once heated, the peripheral edge of the preformed pallet may be reshaped by one or more die sets forming the peripheral edge into an enclosed pallet.

Abstract: The improved apparatus includes an improved extruder die assembly comprising a forming section, an injection section, and a converging nozzle section having axially aligned ridgelines which gradually project into the bore of the nozzle as the nozzle converges to gradually disrupt the axial flow of an extrudate at specific peripheral points thereby altering the extrudate's velocity profile. By gradually disrupting the axial flow in close proximity to the projecting ridgelines prior to its extrusion, the dimensional quality of the resulting direct expanded food piece is greatly improved. Moreover, by carefully positioning the capillary channels of the injection section into that portion of the flowing extrudate not affected by the axially aligned ridgelines, a distinct colored and/or flavored pattern is imparted into the extrudable food mass during the extrusion process while improving the quality of dimensional design aspects of the resulting extruded, complexly shaped, direct expanded food products.

Abstract: An extrusion head may be provided. The extrusion head may include an inner flow path, an outer flow path, and at least one sealant flow path. The inner flow path may be configured to direct a flow of an inner layer around a conductor. The outer flow path may be configured to direct a flow of an outer layer around the inner layer. The at least one sealant flow path may extend to a connecting point with the inner flow path and the outer flow path. The at least one sealant flow path may be configured to direct a sealant to fill at least one sealant channel region between the inner layer and the outer layer. The connection point may be configured to cause the flow of the inner layer and the flow of the outer layer to join before the sealant fills the at least one sealant channel region.

Abstract: An extrusion die assembly includes a hollow extrusion head which has a head inner surface, a central passage inlet opening, a forming section having a die opening, and a receiving space that extends from the central passage inlet opening to the forming section. A flow-dividing core is disposed within the receiving space, and has a central passage connected to the central passage inlet opening and extending to the forming section, and a grooved outer surface that is disposed upstream of the forming section and that has at least one groove which cooperates with the head inner surface to define at least one accumulating passage. An annular passage is formed in the forming section and around the flow-dividing core and the central passage, is connected to the accumulating passage, and merges with the central passage in the die opening.

Abstract: A cutter assembly for an extruder includes an elongated extrusion member having an open feed end. The open feed end is attachable in fluid communication with the extruder for supplying a mash to said elongated extrusion member. An extrusion die is supported on a front of the elongated extrusion member. The extrusion die includes an extrusion outlet formed therein. A filling tube is mounted on a rear of the elongated extrusion member and is attachable in fluid communication with the extruder for supplying a filling to the filling tube. A cutter member has a drivable end and a cutter blade with a cutting surface for cutting extrudate to a desired length as the extrudate exits the extrusion die. The cutter member is operably connectable at the drivable end to a drive device of the extruder for reciprocatably sliding the cutting surface of the cutter blade over and away from the outlet of the extrusion die.

Abstract: Provided is a sheet forming die capable of finely controlling the flow rates of the respective divided flows of a molten resin with precision. The sheet forming die is a sheet forming die 3 configured to: receive a first molten resin B; to receive a second molten resin A:; and to thus form a sheet-shaped resin-made product by discharging the molten resins A, B from a lip gap 15.

Abstract: An extrusion head comprising at least one drive wheel and an assembly positionable between at least a first state and a second state. The assembly comprises a first extrusion line configured to engage the at least one drive wheel while the assembly is positioned in the first state, and a second extrusion line configured to engage the at least one drive wheel while the assembly is positioned in the second state.

Abstract: A method of manufacturing a catalyst, a catalyst precursor, or a catalyst support comprising: (a) mixing a refractory metal oxide or precursor thereof with a liquid to form a paste; (b) adding said paste to an extruder, the extruder having a die plate comprising one or more dies, each die having a plurality of apertures, the outlet of each aperture having a cross sectional area of 6 mm2 or less; (c) extruding the paste through the apertures to form catalyst support extrudates; wherein the inlet of the apertures has a greater cross sectional area than the outlet of said apertures; and wherein for at least one die the combined cross sectional area of all apertures at the inlet relative to the total cross sectional area of the die at the inlet is higher than 50%.

Abstract: A method and apparatus for forming an article from mouldable material is disclosed. A mouldable material, such as a thermoplastic is heated until it is molten and is fed into an injector (900) of an injection moulding apparatus. A liquid, such as water, is introduced (930) into the stream of molten plastic. Because the molten plastic is at a temperature above the boiling point of the water, the water will boil and will expand the plastic material forming a honeycomb structure of bubbles that remains once the material has cooled.

Abstract: The present invention is directed to a bitumen bale capsule, capsule dispenser and bale strip former for viscous bitumen products comprising a bitumen bale capsule; a capsule dispenser (L) in order to position the said PE encapsulating capsule inline with a plurality of dispensing valves (F) and a plurality of forming nozzles (M); a bitumen bale strip former for converting the said round PE encapsulated tubes into flat strips suitable for baling. The overall function of the said bitumen bale capsule is to encapsulate viscous bituminous products forcing through the internal core of the said capsule. The said products exiting the said encapsulation process in the form of a PE round tube are converted into a flat strip suitable for baling utilizing both of the said capsule dispenser and the said bale strip former.

Abstract: Electrically operated actuator for modifying the thickness of the parisons during extrusion, by means of the usual means which modify the internal cross-section of the discharge mouths of the extrusion head and which are connected to a common cross-member (7) which may be guided by suitable means (107, 8) during the vertical movements, characterized in that the said cross-member is raised and lowered by means of mechanical systems which comprise at least connecting rods and cranks and which are actuated by a speed reducer (9) with limited play, which is fixed onto a support structure (102) positioned above the said cross-member (7) and moved by an electric motor (109) of suitable power, rotating in both directions and with electronic speed and phase control, for example a motor of the brushless type.

Abstract: Extruded, striped drinking straws are formed by coextruding at least two polymers of different color through a common extruder to form an elongated tube. An oscillator consisting of a pair of rolls supported for rotation about their central axes, extending normally to the extension of the tube, bear against opposed sides of the tube and are reciprocated in opposing directions so as to rotate the tube by a gear and spline mechanism. A straight puller draws the tube out of the extruder and through the twisting oscillator and a cutter forms the tube into straw lengths at the output of the puller.

Abstract: An injection molding die for producing a molded product having an appearance surface, an injection molding method for producing a molded product having an appearance surface, and a resin molded product molded by the injection molding method which is free from occurrence of appearance deficiency such as a flow mark or the like that is a drawback in appearance. A molten thermoplastic resin material is injected into a cavity defined by a molded product's appearance surface forming portion (4a) and a molded product's rear surface forming portion (6a) through one or more direct gates and one or more hot runners to fill the cavity with the molten resin material, thereby performing injection molding.

Abstract: The dimensions of a tube molded by an extrusion molding apparatus are made more accurate. The arrangement of the extrusion molding apparatus enabling the molding of the aforesaid accurate tube is simplified. The molding of the aforesaid accurate tube is facilitated. The extrusion molding apparatus (1) comprises extruders (6, 7) for thermally melting resins (3, 4) to enable their molding, and a die (11) having tube molding passages (9, 10) for forwardly passing therethrough the resins (3, 4) extruded from the extruders (6, 7) to enable the molding of a tube (2). Flow adjusting valves (34, 35) are installed which enable the adjustment of the respective flows per unit time of the resins (3, 4) passing from the extruders (6, 7) to the tube molding passages (9, 10).

Abstract: An apparatus for the manufacture of compound pipes with an oval cross-section is equipped with mould halves which advance in a direction of production and of which two at a time combine as a pair on a moulding path to form one mould. An injection head of at least one extruder is arranged upstream of the moulding path. An external nozzle used for the creation of an external tube is substantially circular in shape and is located at a distance upstream of the moulding path. An internal nozzle with a cross-section similar to the oval cross-section of the pipe to be created is located inside the moulding path. When entering the moulding path, the external tube extruded through the external nozzle is expanded in one direction and pressed together in a direction which is perpendicular to the former.

Abstract: An extrusion die for extruding hollow profiles is suggested having a die head (2), which is connected to a runner part (1) and forms extrusion channels (3) for shaping a profiled strand (4), and having a runner chamber (5), which is provided between the die head (2) and the runner part (1) and runs transversely to the extrusion channels (3), which is connected around its circumference (8) to an annular channel (7) for impingement with plastic melt and from which the extrusion channels (3) of the die head (2) originate. In order to provide advantageous construction conditions, it is suggested that the runner part (1) have an inner channel (9) discharging into the runner chamber (5) inside the annular channel (7) for additional impingement of the runner chamber (5) with plastic melt.

Abstract: An extrusion head comprising at least one mounting structure, a first liquefier pump secured to the at least one mounting structure, a second liquefier pump disposed adjacent to the first liquefier pump, a toggle mechanism supported by the at least one mounting structure and configured to move the second liquefier pump relative to the first liquefier pump along a first axis, and a slot engagement assembly connected in part to the second liquefier pump for defining a range of motion for the second liquefier pump along the first axis.

Abstract: Coextruded films provide cross directional zoned multiple components side-by-side to one another. Systems and methods relate to coextruding such films. During coextrusion, a first polymer conjoins with a second polymer while a temperature differential is maintained between the first and second polymers. This temperature differential is selected to reduce a difference between the viscosities of the first and second polymers making the viscosity of the first polymer close enough to the viscosity of the second polymer to avoid separation upon coextrusion. Further, the films may form a layer in subsequent lamination to other material layers.

Abstract: An extrusion head for at least one extruder including a first head part having a first joint and a second head having a second joint wherein the first head part and the second head part are pivotable with respect to each other using the respective first joint and second joint. When the extrusion head is in an operative position, the first head part rests against a first sealing face and the second head part rests against a second sealing face. A drive element is connected to the first head part and the second head part using a connecting element. The first head part and the second head part are movable using the drive element from a fixed operative position into an open rest position.

Abstract: A multiple extrusion head 1 for blow molding extrusion machines has a plurality of first extrusion heads 2 fixedly arranged side by side in a first row forming a first plane 3. A plurality of second extrusion heads 4 are fixedly arranged side by side in a second row forming a second plane 5 that extends parallel to the first plane 3. Per row, distributing devices 6, 6a, 6b are provided with first distributing channels 7, 10 that are arranged in the first plane 3 and the second plane 5, respectively. Each distributing channel is connected to an extrusion head 2 and 4, respectively, comprising a joint first and, respectively, second mass entrance 9 and 12. The distributing devices 6a, 6b are separated in the region of the first plane 3 and second plane 5 respectively. Furthermore, a third distributing device 15 is provided with third distributing channels 18 that are arranged in a third plane 16 extending at a right angle relative to the first plane 3 and to the second plane 5.

Abstract: A process for shaping a frozen confectionery product is provided, the process comprising: extruding a frozen confection from a filling means comprising a nozzle and a cutting means into a cavity which is in fluid communication with the nozzle; moving the cavity relative to the filling means so that the cutting means shears the frozen confection and thereby cuts it; and removing the frozen confection from the cavity, characterized in that the cross-section of the cutting means, when viewed along the direction of relative motion of the cavity and the cutting means is not a straight line. An apparatus for performing the process is also provided.

Abstract: The present invention relates to processing of thermoplastic polymers, for example to injection molding and extrusion. More particularly the present invention relates to extrusion of polyolefin resins, especially polyethylene resin, and could be used in manufacture of polymer profile, isolating jacketing at electrical cable, polymer tube and film in blown film process. The present invention is directed to increase rate of defect free extrusion. Other objects of the present invention are: to lower cost of the used additives, to lower amount of additives during extrusion of polymer melts with fillers, to simplify design of equipment, which is used for processing of polymeric materials, to save energy, which is necessary for processing, to improve product appearance and its mechanical performances.

Abstract: The aim of the invention is to create a cap, whose sealing behavior is identical to that of common PT sealing systems, wherein the amount of compound used is reduced, meeting current and future requirements related to the sealing of containers which are filled with foodstuffs. The invention relates to a method for forming a tight, sealing zone (10;10V,10D) which is provided with a compound (A,B) in a cap (1) made of a substantially metal material. Two methods for applying two compound layers are used successively, involving the application of a first compound (A) and a second compound (B), said compounds being different from each other. The two compound layers (A,B) extend in different geometrical areas (Area 2, Area 3) of the cap in the edge area (R) thereof with a tight and sealed area (10D,10V).

Abstract: The method makes it possible to produce a seal (1) of an extruded plastics material, including a tubular section (3) with a wall of variable thick?ess (WT), using a distribution chamber having a terminal die plate (12) with an annular extrusion orifice (15) formed therein, corresponding to the cross section of the tubular section (3). A chamber (18) is formed in the distribution chamber in communication with the extrusion orifice (13) and into which an elastomeric material is fed for forming the tubular section (3). The chamber (18) of the distribution chamber is in open communication with the outside environment by a passage (21) which is separate from the extrusion orifice (13) and is provided to carry a flow of elastomeric material coming from the chamber (18).

Abstract: A method and apparatus is provided for distributing material through a multilayer pipe extrusion die. A first flow passageway, having a first cross-sectional area and extending along a first flow direction, may be connected to a second flow passageway, having a second cross-sectional area substantially the same as the first cross-sectional area of the first flow passageway, to provide a second flow direction different from the first flow direction of the first flow passageway. A conical passageway may extend from the second passageway toward a dispensing outlet. Material may be distributed from the first flow passageway into the second flow passageway. The method and apparatus may generally maintain the same flow properties of the material at a point before and after the connection of the first flow passageway and the second flow passageway. The flow properties of the material may be altered proximate to the outlet.

Abstract: The invention relates to an extrusion storage head (10) for a blow-molding machine and a method for production of blow-molded multi-layer plastic hollow bodies made from a two- or multi-layer pre-form, whereby two or more peripheral manifolds (16, 18) are arranged above a storage reservoir (20), from which the peripherally-extruded plastic may be sequentially ejected as a tubular parison from a controlled annular nozzle (24) by means of an ejector piston (22). According to the invention, an additional peripheral manifold (26) is arranged between the storage chamber (20) and the controlled annular nozzle (24) for application of a further plastic layer (outer functional layer) on the previously peripherally extruded plastic carrier. The additional peripheral manifold (26) is connected through a supply line (28) to an additional external storage element (30) for the molten plastic of the functional layer, wherein the additional external storage element (30) has a separate extruder (32).