Abstract: An extrusion apparatus for producing thee-dimensional objects comprises at least one die, an extruder, and a rotatable cutter plate. The die is disposed adjacent to an outlet end of the extruder. The die forms an opening defining a two-dimensional shape, and the extruder forces an extrudable material through the opening in the die. The rotatable cutter plate is disposed adjacent to the die. The cutter plate is configured to obstruct different portions of the die opening at different times as the cutter plate rotates so as to vary the shape of the extrudable material forced through the opening in the die and thereby create a three-dimensional shape. The cutter plate is configured to fully obstruct the opening in the die during each revolution of the cutter plate so as to separate the extrudable material forced through the opening in the die into individual objects.

Abstract: Granular material is produced by discharging a viscous material from a vessel and onto a support surface on which the material solidifies. The vessel has first openings through which the material flows, and a belt travels across lower ends of the first openings, whereupon second openings of the belt periodically come into alignment with the first openings to permit a downward flow of the material. The belt comprises a plurality of links having long and short sides, with the long sides arranged parallel to one another and perpendicular to the direction of belt travel. Mutually facing long sides of adjacent links have undercut grooves which receive an elastic connector in the form of a pair of parallel rods received in the recesses and interconnected by springs.

Abstract: An apparatus for preparing an article of ice confectionery has two tube assemblies which each have a mobile portion positioned coaxially one to the other. Each mobile portion has a distribution channel which extends to a nozzle delivery end configured in a fishtail shape for depositing material, the mobile portions being positioned and configured so that at least a portion of the distribution channels are separated for thermally isolating the channels and so that upon axial rotation of the mobile portions, material deposited from one nozzle is integrated with material deposited from the other nozzle. The mobile portions may be driven for rotation separately, or one mobile portion may be driven and connected with the other mobile portion for driving the rotation of the other mobile portion.

Abstract: An extruder for extrusion manufacturing one of a hard metal and a ceramic rod with at least one helical inner bore and having a smooth outer surface substantially free of elevations and depressions includes a housing and a die connected to the housing. The mechanism for forcing a plasticized mass through the die is provided wherein the mass is shaped in the form of a billet having a cross-section. A spinner is located in the housing upstream of the die for twisting the mass uniformly over the cross-section of the billet, the spinner being surrounded by an axial flow of the mass. A smooth channel is located downstream of the spinner such that the mass emerges from the channel through the die and a mechanism is provided suspending a filament in the mass wherein the filament follows a twisting movement of the twisted mass so as to form a helical inner bore therein.

Abstract: A mechanism for making granulated material from a viscous substance includes a vessel charged with the substance and having a discharge opening arrangement for discharging the substance onto a cooling surface. A belt travels across the vessel, the belt having openings arranged to periodically come into alignment with the discharge opening arrangement to allow the substance to fall onto the cooling surface. The discharge opening arrangement comprises a plurality of rows of discharge openings. Each row extends transversely of the longitudinal direction of belt travel, and the rows are spaced apart in that longitudinal direction. The vessel openings of each row are offset in the transverse direction with respect to the vessel openings of other rows. A collection arrangement collects residual substance falling from the belt and returns the substance onto the belt at a location upstream of the vessel.

Abstract: An improved extrusion apparatus having an internal deckle, includes a toothed rack and a rotatable gear for positioning the deckle. The apparatus may include an independently adjustable, upstream deckle. A brake mechanism that assists the control of deckle movement, is also provided. A tongue and groove, sliding fit of the deckles may be used.

Abstract: The annular channel elongate nozzle of an extrusion die (10) suitable for use for extrusion into a travelling mold tunnel, has an inner core (16) profiled for attachment to any one of a number of interchangeable end fitting nozzles outlet (100). The profiling takes the form of a step between an upstream portion (22) of the core and a reduced diameter downstream portion (24). Each end fitting outlet has an annular sleeve (34) to fit about the downstream core portion to extend the surface of the upstream portion of the core. The sleeve abuts the step (26) thereby locating the end fitting outlet correctly. No locking means is necessary between the end fitting and the core in the region of the nozzle. Attachment may be effected between them at a location downstream of the point at which extrudate is extruded into the mold tunnel. Hence, attachment is not hampered by the presence of extrudate and the attachment (40, 20, 25) may not interfere with the flow of extrudate.

Abstract: An extrusion die (1) with a calibrated exit orifice (6) for extruding extruded sections (3, 3', 3") of different profile cross-sections onto a glazing or glass plate (2) is provided with an obturating slide (22) movably positioned in front of the calibrate exit orifice (6) through which the die cross-section can be adjusted. The slide (22) is operated by a pneumatic jack (16).

Abstract: An apparatus for producing an automobile windshield molding for sealing a space between a windshield and a periphery of a window opening of a vehicle body panel utilizes cooperating dies. The windshield molding comprises a pair of extruded side molding parts, a pair of extruded corner molding parts, and an extruded upper molding part integral with and extending between the side and corner molding parts. Each of the side molding parts associated with each side edge of the windshield is larger in thickness compared to the upper and corner molding parts, where a water drain channel is formed.

Abstract: A multi-hole tube extrusion die comprises a female mold die having a flat opening and a mandrel having comb-teeth-like molding portions arranged in the opening. A heated material is extruded between the female mold die opening and the comb-teeth-like molding portions of the mandrel to form a tube having a multi-plicity of holes. An interval between each of the comb-teeth-like molding portions at the opposite ends of the mandrel and the comb-teeth-like molding portion adjacent to the outermost comb-teeth-like molding portion is set to be smaller than an intervals between the female mold die opening and each of the outermost comb-teeth-like molding portions and to be larger than an interval between adjacent ones of the other comb-teeth-like molding portions. Additionally, the outermost comb-teeth-like molding portions are larger in width than the other comb-teeth-like molding portions.

Abstract: An assembly and method for processing extrudate material containing curves or angles into a predetermined overall configuration, including having a die assembly for an extruder which assembly controls the cross-sectional shape or profile of the extrudate and selectively varies the path of the extrudate as it leaves the die assembly. A support member is provided which has a predetermined overall configuration and profile to receive the extrudate and maintain its configuration. A driving apparatus is also provided for continuously driving either the support member or the die assembly relative to the other while the extrudate is being received in the support member, and until the entire predetermined overall configuration has been completed. The path of the extrudate is variably directed by the die assembly as it leaves the extruder in coordination with the relative speeds involved to conform the extrudate configuration to the predetermined overall configuration of the support member.

Abstract: Devices are disclosed for forming egg-yolk disks by wire-cutting egg-yolk material extruded from a main cylinder. The main cylinder ends to an extrusion-head. The extrusion head may be threaded on a cylinder to a desired degree, so that during the disk-cutting process, the cutting wire slides on the front surface of the extrusion head. The Devices may also have a mechanism for locking the extrusion head in position. Miscellaneous mechanisms for wetting the cutting wire are also disclosed.

Abstract: An extrusion molded article is extrusion molded through an extrusion opening of a die. Then, in a vulcanizing bath, the cross-sectional configuration of the extrusion molded article is modified by utilizing shaping means during the process from the start of vulcanization of the extrusion molded article to a semi-vulcanization thereof, and subsequently, vulcanization of the extrusion molded article is completed. In this way, a long elastic member having required elasticity and having a cross-sectional configuration changed to a required one can be easily manufactured.

Abstract: An assembly (10) is disclosed including a rotor (38) extending into a rotor bore (24) and into a dough chamber (26) of a die housing (16), with the rotor (38) rotating at relatively high speeds in the order of 4,000 RPM. A bushing (62) is provided in the rotor bore (24) to provide a seal with the rotor (38). The bushing (62) has a small clearance with the rotor (38) sufficient to reduce frictional forces to minimize wear while effectively preventing passage of the extrudable dough under pressure in the order of 2,800 psi (200 kg per square centimeter) through the rotor bore (24) and around the rotor (38). The dough which does pass through the small clearance is allowed to fall away from the rotor (38) outside of the rotor bore (24).

Abstract: An apparatus for the manufacturing of plastic pipes has half shells of which two at a time combine as a pair to form a mold. It is provided with a temperature-regulating bell. Supply lines are formed as flexible supply hoses of temperature-resistant plastic material. A line conduit accommodating them is provided with a protecting tube, which accommodates the supply hoses and which is provided with a heat insulation towards an injection head.

Abstract: An apparatus for making extruded tubing having one or more lumens therein with a variable outer diameter. The apparatus is useful for forming tubing of an extrudable material such as an elastomer or thermoplastic. The extrudable material is forced around a mandrel and through a die aperture over a mandrel wherein the inside surface of the tubing is of uniform diameter along its length but the wall thickness varies throughout its length. Such an apparatus may be used, for example, to make kink-resistant tubing. In one embodiment, the aperture in the extrusion die has a variable diameter while the mandrel remains constant. In a second preferred embodiment, a moveable ring with a central aperture is disposed within the extrusion chamber coaxially with the mandrel. The ring is capable of reciprocal motion in the direction of extrusion. During extrusion, when the moveable ring is moved toward the die opening, it constricts the outer diameter of the tubing thus formed.

Abstract: An extrusion die includes a die body defining a manifold therein terminating at an outlet and first and second relatively moveable plugs disposed in the manifold each having a plug edge where the plug edges together define a profile. The first and second plugs are moveable to first and second plug positions, respectively, in the manifold and indicators are disposed outside of the die body for indicating the first and second plug positions and the profile.

Abstract: An improved extrusion apparatus having an internal deckle system, is provided. The extrusion apparatus includes a body portion which includes a flow passageway. The deckle system includes a deckle member having a full width, manifold plug portion and a fin-shaped plug portion, each extending through an end of the body portion into the flow passageway.

Abstract: An improved extrusion method is employed in a process which is used to form tubing for medical applications. The method includes providing an extrusion apparatus having a die which includes a die cavity and a mandrel within the die cavity. The die is rotated in a first rotational direction while the mandrel is rotated in a second rotational direction opposite the first direction. While the die and the mandrel are rotating, a PTFE paste is passed through the annular passage defined between the die and the mandrel. The die cavity is cooled to maintain the PTFE paste passing therethrough at a substantially non-elevated temperature.

Abstract: A heating and extruding method for a bulk preform of a fiber reinforced composite material, including a stabbing machine for forming an unpenetrated hole in the bulk preform, a heating machine connected to the stabbing machine for heating the bulk preform by a nitrogen gas, and an extruding machine connected to the heating machine for heating and compressing the bulk preform heated by the heating machine to discharge a predetermined amount of the bulk preform, wherein at least the heating machine to the extruding machine has a sealing structure sealing a nitrogen gas therein. An extruding lip of the extruding machine has a thickness restriction plate and a width restriction plate for respectively adjusting an extrusion thickness and an extrusion width of the melted composite material. Accordingly, oxidation and degradation of resin composing the fiber reinforced composite material can be prevented.

Abstract: A throttle for the adjustment of the pressure of plastic material in screw extruders in which the throttle is a cylindrical plunger submerged in the melt flow in a melt channel. In order to eliminate dead spaces downstream of the throttle, the plunger is arranged in a symmetrical and displaceable manner in a rectangular melt channel and one or more through holes are provided in the plunger in the flow direction in the submerged region of the plunger.

Abstract: A method of making by extrusion-molding an elongated window frame used for a window panel of a vehicle is to use an extrusion molding die which includes a slide core defining the cross-sectional shape of the window frame, and to move the slide core in the extrusion-molding die so that the cross-sectional shape of the window frame is continuously changed along the direction of the length.

Abstract: A method and device for molding a door seal, such as for an automobile. The device is provided with a first extrusion passage for extruding a molding material into a hollow portion of the door seal. A second extrusion passage is provided for extruding molding material into a bridge which spans across the hollow portion of the door seal. A molding material discharge member, such as a pipe, is movably inserted into the molding die and can be moved between open and closed positions relative to a molding material supply passage for permitting material to be intermittently extruded through the second passage, whereas material is substantially continuously extruded through the first passage, thereby permitting the bridge to be molded to the hollow portion at selected locations therealong.

Abstract: A die for a blow molding machine has at least one circumferential rectangular cutout section contiguous with the die exit in at least the die ring or the mandrel. The rectangular cutout section expands the material flow channel between the die ring and the mandrel to increase the volume flow of material passing through the die exit at the rectangular cutout section. However, the constant length of the rectangular cutout section in a longitudinal direction maintains a constant linear velocity of material flowing through the die exit.

Abstract: A method of molding an elongated, tapered seamless and hollow member or tubular of net shape comprising providing an elongated, tapered mandrel, applying a composite material consisting of reinforced fibers with a resin on the mandrel, providing a shell having an elongated, tapered bore, inserting the mandrel with the composite material applied thereon into the bore of the shell to provide a mold assembly, heating the mold assembly, displacing the mandrel and shell longitudinally toward each other to compress the composite material of the article being formed by simultaneously applying a tensile force at one end of the mandrel and a compressive force at the other, allowing the mold assembly to cool, and then separating the shell and mandrel from the molded article.

Abstract: A nozzle assembly for forming hollow fibers, particularly a "Z-fiber" having longitudinally oriented trabeculae with the fiber wall, is provided. The nozzle assembly contains a replaceable nozzle cap, a replaceable seal-guide, and a retractable central bore used to supply core material for the hollow fibers. The Z-fibers are particularly useful in enabling cells, solutes, or the like, to enter the fiber wall and move longitudinally into the center of the fiber wall.

Abstract: A method of producing an automobile windshield molding for sealing a space between a windshield and a periphery of a window opening of a vehicle body panel utilizes cooperating dies. The windshield molding comprises a pair of extruded side molding parts, a pair of extruded corner molding parts, and an extruded upper molding part integral with and extending between the side and corner molding parts. Each of the side molding parts associated with each side edge of the windshield is larger in thickness compared to the upper and corner molding parts, where a water drain channel is formed.

Abstract: When forming a molding strip of varying cross-sectional shape along its length, lengths for finishing into molding strips are extruded with a prescribed cross-sectional shape through an extrusion port provided in the dies, before removing superfluous portions from the molding strip proper, wherein superfluous portions is extruded using a different resin material which is incompatible with that used for extrusion of the molding strip proper for later removal of said superfluous portions made of the different incompatible resin material from the molding strip proper.

Abstract: This invention relates to an apparatus for continuously extruding a viscous material having discontinuous reinforcing fibers therein. The apparatus has a rotating extruder head assembly including an extruding die having an extruding passage. A plurality of vanes extend outward from the extruding passage. In response to rotation of the extruder head assembly the fibers are orientated on a helix about a mandrel.

Abstract: A method of adjusting gap of a plastic flow channel is provided in a plastic forming device having a first body part adjacent one side of and adjustable relative to the channel and a second body part on which the first body part is mounted by a tight fitting between the first and second body parts. When the device is not in operation one of the body parts is subjected to a first temperature change producing a temporary temperature differential and a loosening of the fitting between the body parts. Positioning of the first body part on the second body part is adjusted while the fitting is loosened and then the one body part is subjected to a second temperature change opposite to the first temperature change to offset the temperature differential and restore the tight fitting between the body parts.

Abstract: The invention relates to a storage head for a blow moulding machine for discontinuous manufacture of multi-layer co-extruded and blow-moulded hollow bodies made of thermoplastic. To improve the product quality and to increase the throughput, each distributor element is designed as a spiral channel distributor (20) which distributes the individual molten plastic streams uniformly at the periphery. The ejector (14) consists of at least two concentric tubular pieces (42, 44) and the peripherally distributed plastic flows from the ejector (14) through an annular gap (46) into the storage space (16) in the storage head housing (10) below the ejector.

Abstract: The inventive deckle piston compression and adjustment mechanism is used in changing the coating width of a die manifold. The deckle consists of elongate positioning shaft for positioning the deckle in the die manifold. A deformable sealing piston formed of Rulon LR is carried by the shaft and is constructed and arranged to substantially fill the die manifold. An expansion mechanism is used to expand the Rulon seal, thereby causing the deformable seal to expand to form a seal in the die manifold.

Abstract: An improved extrusion apparatus includes an adjustable deckle and a flow channel in the deckle that makes possible extrusion of a composite stream, and in particular a side-by-side composite stream. Beneficially, an end plate of the apparatus includes an inwardly projecting portion disposed in precision sliding fit within the deckle channel. Also provided is a process for composite extrusion with width adjustment.

Abstract: A method for forming an extruded weather strip having a trim portion and a lip having a thickened end portion.

Abstract: A parison molding method and its apparatus in which at least two kinds of materials are used, and the layer formation and dispersion are uniform in the weld part and in the circumferential direction. In the parison molding method and its apparatus, molten resin at a weld part within a parison head is discharged out of the parison head by way of a flow control valve.

Abstract: Apparatus for the manufacture of an ultra-high molecular weight polyethylene thin-wall pipe which is uniform in thickness and free from a folded mark. The ultra-high molecular weight polyethylene thin-wall pipe is manufactured by supplying ultra-high molecular weight polyethylene into and melting and kneading, continuously extruding the molten substance of the ultra-high molecular weight polyethylene from a die connected to a screw of the screw extruder to form a cylindrical roughly shaped article, and diametrically expanding the cylindrical roughly extruded article by a tapered core and taking up.

Abstract: An apparatus for production of a layered extruded article has an extrusion nozzle positioned for extruding an extrudable composition in a vertical downward direction. The nozzle has a fixed upper part, a joint member and a lower mobile part having a slot extrusion die. The joint member connects the upper and lower parts so that the lower part is rotatable about a central vertical axis of the lower part so that upon rotation of the lower part and extrusion of the extrudable composition, a helical ribbon is formed. A spray nozzle is positioned for spraying a sprayable composition into the passage of the helical ribbon between helical peak flights, and a support, which may be advanced continuously or step-by-step, is positioned beneath the extrusion and spray nozzles for receiving the sprayed, extruded composition.

Abstract: A method for molding shaped products from particles of vegetable origin which have a size of 0.002 to 10 mm at a moisture content of 4 to 15%. The method includes the steps of mixing a filler containing particles of vegetable origin and a binder which is obtained from hemicelluloses released from particles of vegetable origin upon molding. The briquettes are formed from the resultant mixture with an axial passageway then packed and transferred to a molding zone where a continuous shaped blank is obtained by joining each successive packed briquette to the preceding one under a specific pressure of 2 to 50 MPa and a temperature in the range of 160.degree. to 350.degree. C. A counterpressure equal to at least the molding pressure is generated as each successive packed briquette is joined at the molded end of the continuous molded blank. Then products of required length are cut from the resultant continuous shaped blank. An apparatus for carrying out the method includes a chamber (4) for molding the briquettes.

Abstract: A method and apparatus in the context of a rotating conveying screw situated within a cylindrical housing which has an inlet port on one end of the cylinder and a discharge opening on the other end of the cylinder. A resistance plate is mounted transversely to the conveying screw near the discharge opening for corotation with the screw. The plate is mounted to define a discharge gap between the opening and the plate. A sleeve on the housing is employed to adjust the size of the gap between the plate and the opening. The resistance plate can be a flat disc, conical, or other shape, so long as it is effectively attached to and rotates with the screw. The helical screw is preferably supported at both ends by a bearing means. Breaker bars are mounted on the transverse plate and extend over the gap between the discharge opening and the plate. Breaker bars may also be mounted to the cylindrical sleeve and extend over the gap between the sleeve and the plate.

Abstract: An extrusion head for a blow molding machine wherein a movable plunger is slidably mounted in a distributor head which receives a melt at an inlet end of its channel and directs it along such channel to the terminal end of the channel while simultaneously directing portions of it along spiral radial paths to the lower circumferential edge of the distributor head to fill an accumulator chamber which also causes the plunger to recede facilitating the filling of the accumulator chamber. The channel as defined by the adjacent circumferential wall and the curvilinear contour on the distributor head defines a smooth integral flow channel that is curvilinear in cross section.

Abstract: An apparatus for the manufacturing of plastic pipes has an injection head and half shells of which two at a time combine as a pair to form a mold. The injection head has at least one channel issuing in a substantially ring-shaped nozzle, which is delimited by two components one of which being adjustable for modification of the width of the nozzle. A component directly delimiting the nozzle is tiltable in relation to the central longitudinal axis, whereby an adjustment of the width with great sensitivity is attained for such a ring-shaped nozzle.

Abstract: In the production of kiln fired bricks and hollow structural tiles a substantial loss (about 3.5%-7%) occurs during drying and firing, principally in the bottom layers adjacent the kiln car deck. This can be minimized by reducing the size of the core holes in the bottom rows of bricks, large holes being maintained in the upper layers to reduce the load on the bottom bricks, economising in fuel and clay. The method and apparatus involve use of a longitudinally movable core plug for each hole produced the downstream end portion of which produces small holes while an upstream portion produces large holes, the shape being such that in cooperation with the extrusion nozzle uniform flow and compression are maintained to equalise final column swell sizes as much as possible for both large and small core hole brick preforms.

Abstract: A parison controller of blow molding apparatus for varying the thickness of a parison extruded from an ejection orifice by displacing in an up and down direction a core provided at the ejection orifice of the die of a cross head. The parison controller of blow molding apparatus has a motor through which the core is displaced. It further includes: a rod connected to the core provided at the cross head; a female threaded portion formed on the upper portion of the rod; a rotating rod having a male threaded portion threaded into said female threaded portion; a reduction gear connected to said rotating rod through a thrust bearing; and the motor connected to the reduction gear. Since the core forming the ejection orifice for ejecting the parison is displaced through a motor, a reduction in the size thereof and saving of resources may be achieved and a high quality parison may be obtained as compared with a conventional parison controller which uses a hydraulic system.

Abstract: An apparatus for extruding plastic tubing includes a machine stand; an extrusion cylinder supported by the machine stand; a housing supported on the machine stand; a hollow extrusion piston introducible into and withdrawable from the extrusion cylinder; an extrusion drive accommodated in the housing and connected to the extrusion piston for advancing the extrusion piston into and for withdrawing the extrusion piston from the extrusion cycliner; an mandrel pulling rod mounted in, and axially displaceable relative to, the hollow extrusion piston; a mandrel affixed to the mandrel pulling rod and moving as a unit with the mandrel pulling rod for introduction into and withdrawal from the extrusion cylinder; and a mandrel actuating drive circumferentially surrounded by a sleeve-shaped component of the extrusion drive in the housing and connected to the mandrel pulling rod for axially displacing the mandrel pulling rod.

Abstract: A method of manufacture of an ultra-high molecular weight polyethylene thin-wall pipe which is uniform in thickness and free from a folded mark. The ultra-high molecular weight polyethylene thin-wall pipe is manufactured by supplying ultra-high molecular weight polyethylene into and melting and kneading, continuously extruding the molten substance of the ultra-high molecular weight polyethylene from a die connected to a screw of the screw extruder to form a cylindrical roughly shaped article, and diametrically expanding the cylindrical roughly extruded article by means of a tapered core and taking up.

Abstract: A method of the device for producing a hollow columnar piece whereby a blend of essentially thermoplastic particles is melted into a billet, introduced into a mold, looped into layers inside the mold, and transformed into a piece, subsequent to which the piece is solidified by cooling and removed. The billet (3) is rotated around its axis and concentric with its face as it is introduced into a mold (4), the mold accommodates a core (20), space is left between the core and the inner surface (6) of the mold, the billet is laid along the circumference of the space, and the billet continues to be introduced into the space until the mold's inner surface and core are uniformly and continuously wet with constituents of the billet.

Abstract: The invention relates to a storage head for a blow moulding machine for discontinuous manufacture of multi-layer co-extruded and blow-moulded hollow bodies made of thermoplastic. To improve the product quality and to increase the throughput, each distributor element is designed as a spiral channel distributor (20) which distributes the individual molten plastic streams uniformly at the periphery. The ejector (14) consists of at least two concentric tubular pieces (42, 44) and the peripherally distributed plastic flows from the ejector (14) through an annular gap (46) into the storage space (16) in the storage head housing (10) below the ejector.

Abstract: The invention relates to a storage head for a blow moulding machine for discontinuous manufacture of multi-layer co-extruded and blow-moulded hollow bodies made of thermoplastic. To improve the product quality and to increase the throughput, each distributor element is designed as a spiral channel distributor (20) which distributes the individual molten plastic streams uniformly at the periphery. The ejector (14) consists of at least two concentric tubular pieces (42, 44, 46) and the peripherally distributed plastic streams issue from the front face of the ejector (14) and unite to form a single multi-layer flexible plastic tube in the storage space (16) in the storage head housing (10) below the ejector.

Abstract: An extrusion die for extruding a thermoplastified synthetic resin, e.g. for a foil-blowing head or a wide-slit nozzle can have its adjustable lip positioned to vary the thickness of the extruded strand by a driver acting on a rod engaging that lip and driven by a step-down transmission from a servomotor which may be a stepping motor.

Abstract: The method and apparatus for producing members (4) of extrudable material, for example a ceramic or synthetic plastic material, use a nozzle (2) composed of a plurality of segments (21 to 25) abutting without gaps and having extrusion ducts (28), segments (21, 22) of the nozzle being moved relative to one another, for example transversely relative to the direction of extrusion. With this method and apparatus it is possible to produce in a single operation members of which the structures, such as open ducts (40), change their relative positions and cross one another.