Abstract: An annular block (3) and an annular housing (23) are arranged in a lower portion of a head unit (1). A plurality of cylinder bores (27) are arranged within the housing (23) in along its outer periphery. The cylinder bores (27) are opened inwardly and acclivously in an inner peripheral surface (26) of the housing (23). At the time of clamping actuation, pistons (28) inserted into the respective cylinder bores (27) are adapted to be advanced inwardly and acclivously. Thereupon, a flange (15) provided in the upper portion of a die (5) is pressed to a bottom surface of a receiving hole (14) provided in the block (3) by clamping members (42) of the pistons (28).

Abstract: The invention relates to a removable insert for casting molds having a fastening screw for fastening the insert in the mold hollow, which screw can be moved to the fastening position by means of a screwdriver engaging an engagement region. It is provided that the engagement region of the fastening screw is oriented toward the mold hollow, and the fastening screw can be anchored in the inner wall of the mold hollow, that the insert has the cavity for the fastening screw, in which cavity the fastening screw is supported and which Cavity is accessible from the mold hollow to the screwdriver, and that the cavity receiving the fastening screw is closable in an undercut-free manner with respect to the mold hollow. The invention also relates to casting molds, equipped with such inserts, for producing workpieces.

Abstract: A powered clamp for holding mold parts to a platen. The platen has a surface with a mounting slot. The clamp includes a base plate to bear against the platen surface. A pivot bolt with a T-head fits in the slot and is held against tilting relative to the base plate. A pivot nut is threaded to the pivot bolt. A clamping bar passes the pivot bolt. The pivot bolt and clamping bar carry bearing surfaces that enable the clamping bar to tilt relative to the pivot bolt. A bias spring bases the bearing surfaces together. A hydraulic piston-cylinder assembly is mounted to the clamping bar, with a piston rod that extends toward the base plate, and has an external thread. A lock ring is threaded to the piston rod to lock the piston rod against retraction while it is in its extended position.

Abstract: An electric circuit wire clamping device of the injection molding machine includes mainly a clamping block, a clamping block cover plate, a cylinder and two push rods. The clamping block Is provided with a bevel slot. The clamping block cover plate is provided with a bevel holding block for holding securely the conducting wire of an electric circuit intended to be housed. The cylinder serves to actuate the two push rods so as to cause the bevel holdeng block of the clamping block cover plate to hold firmly the conducting wire of the electric circuit at the time when the injection molding process of housing the electric circuit is under way.

Abstract: A plastic molding apparatus for semiconductor devices includes a first evacuation passage via which an ejector chamber in a lower die chase block is evacuated through a lower die common surface table, a second evacuation passage via which an ejector chamber in the upper die chase block is evacuated through the upper die common surface table, and a third evacuation passage via which a parting chamber on a parting surface between the lower die chase block and the upper die chase block is evacuated through one of the lower die common surface table and the upper die common surface table. Since the evacuation passages are separate and the volume of the evacuation chamber is reduced, evacuation performance is improved and the size of the apparatus is reduced. The plastic packaging performance is also improved.

Abstract: Flanges are provided on a screw casing and a cylinder member of a screw driving unit in opposition to each other, and coupled with each other with fastening bolts. An adjusting ring is screwed onto the outer circumference of one of the flanges. The screw member is moved together with the ring in a backward direction until the end of the screw hits. The ring is rotated thereafter to bring it into contact with a side of the other flange, where a datum position is established. The cylinder member is then retreated an adequate amount in this state, and the ring is moved by a specified quantity. The specified quantity, represents the stroke quantity and bolts are fastened so that the ring comes into contact with the side of the other flange. The screw is thereby adjusted in its stroke.

Abstract: The synthetic material can be injected into the mold carrier, which can be selectively mounted with injecting molds, by an injection molding unit shiftable in horizontal direction transversely with respect to the injection axis. When shifting the injection molding unit the ending sections of the drive unit are received in seats of a seat support movable at the mold carrier. The shifting device engages at the mold carrier and in the region of the seat support. Besides, the injection molding unit is freely displaceable into shifting direction. That is how a shifting of the injection molding unit in a cost-saving and simple way is achieved, meeting all demands arising during the injection process.

Abstract: A multi-functional mold which is used for encapsulating chips placed on lead frames is characterized by a chamber arranged in one of the mold halves in which an insert can be replaceably arranged. Depending on the use of the mold in the context of the so-called transfer molding method or injection molding method a different insert is placed in the chamber. In the application as transfer mold the insert includes an elongate member with a bore for guiding a plunger which makes encapsulating material liquid due to the pressure applied thereto and the increasing in temperature. In the application as injection mold the insert includes a member with a through-channel allowing a plasticized encapsulating material coming from a nozzle of an injection molding device to flow into the mold.

Abstract: A light weight extruder (20) is suitable for high production, in-line extrusion of flowable materials with high precision in the placement and control of the extruded material. The extruder uses a high torque hydraulic motor (72) to drive a feed screw (88) in dispensing highly viscous but flowable material through an extrusion die (126) of preselected configuration. A plurality of heating bands (114-118) surrounding the barrel (86) of the extruder provide precise control over the material temperature at the point of extrusion. In an alternate embodiment, an injection nozzle (120a) is provided with a plurality of independently controllable extrusion dies (128, 130, 132). The extruder is sufficiently light and manipulable such that it can be mounted on the end of the arm of a robot (122).

Abstract: A frame for supporting a mold for use in manufacturing a product from expanded polystyrene. The frame includes angled corner locking members having longitudinally projecting guide portions located at each end, and longitudinal side members having longitudinally projecting complementary guide portions located at each end. The guide portions and the complementary guide portions are adapted to slidably interfit with one another to form an interlocked engagement. The angled corner locking members and the longitudinal side portions further include recessed portions located on interior facing walls for supporting the mold on the frame.

Abstract: A manually operable and steerable curb extrusion device for extruding curb, barrier, wall, gutter or the like from concrete, cement or some other moldable building material. The curb extrusion device has a segmented vibrating hopper into which building materials are placed to fall onto two tapered counter rotating vibrating augers which compact and force the building material through an extrusion mold where it is shaped before extrusion.

Abstract: A heated manifold system for use in the distribution of heated plastic resins to the various cavities of injection molds for thermoplastic materials. The manifold main structure consists of modular components of similar cross-section that are nested into each other by employing similar slots cut out at the points of intersection of components. The thermoplastic resin passages are bored longitudinally in each modular components, and transverse bores at each intersection provide resin passages between the longitudinal bores. The system includes heated nozzles which have slots to receive cartridge heaters and heater covers, also spring clips to retain the covers and heaters, which can rotate around the shank of the nozzle to allow easy replacement of the cartridge heaters in the event of failure. Internal sealed liquid-filled channels or highly conductive metal rods are used to equalize the temperature of the nozzle from one extremity to the other.

Abstract: A quick change system for standard mold bases in a molding machine. Each half of a mold base has a support plate attached to the back surface. An adapter frame is mounted on the face of each platen of the press. Each adapter frame has a U-shaped guide channel for receiving a support plate and supported mold base half. A T-shaped guide roller is positioned on each side of the U-shaped guide channel to facilitate entry of a support plate into the guide channels. Apertures are provided in each adapter frame plate for fasteners for attaching the adapter frame plates to the platens. A knockout rod assembly is provided for ejecting the finished molded part from the mold base.

Abstract: An injection molding apparatus comprising two spaced, parallel lower guide rods mounted to an undercarriage. A ram carriage and a barrel carriage are slidingly mounted on the lower guide rods. A feedscrew ram extends from the ram carriage into a tunnel formed in the barrel carriage to inject plastic out of a nozzle attached to the end of the barrel farthest from the ram carriage, and into a mold. Two spaced, parallel upper guide rods extend from the barrel carriage to slidingly engage the ram carriage. A pair of hydraulic cylinders displace the ram carriage with respect to the barrel carriage. A third hydraulic cylinder displaces the barrel carriage with respect to the undercarriage. The undercarriage, pivotally mounted to a base, is pivoted by a screw jack which displaces the undercarriage about an arcuate path.

Abstract: In a hot runner exchange apparatus for use in a vertical type injection molding machine made up of a metal mode, a mold clamping device for opening and closing the metal mold in the vertical direction, an injection device having a nozzle provided at the front end of a heating cylinder and a hot runner acting as a passage of molten resin supplied to the metal mold, there are provided a hanger for hanging the hot runner, a device for vertically moving the hung hot runner and a driving device for moving the hung hot runner in the axial direction thereof.

Abstract: A screw linkage structure in an injection molding machine comprises a screw (8) having at its base a spline portion (11), a spline bush (9) for receiving the spline portion (11), a screw sleeve (4) having a front surface to which the spline bush (9) is secured, and a retainer (10) serving to prevent the screw (8) from being disengaged from the spline bush (9). The spline portion (11) formed on the screw base is fitted into the spline bush (9) and includes an annular groove (15). The spline bush (9) has a through-hole acting as a retainer attachment hole (16) at the position corresponding to the annular groove (15) of the screw base to be fitted thereinto. The retainer (10) is then inserted into the retainer attachment hole (16) of the spline bush (9) until its leading edge reach the annular groove (15) of the screw base, thereby preventing the screw (8) from being disengaged from the screw sleeve (4).

Abstract: An injection mold capable being filled from the center is a gated mold with at least one repositionable subgate. The subgate permits simplified removal of the central portion of the molded article, while at least substantially eliminating secondary treatment of the molded article.

Abstract: An extrusion head for an extrusion installation for extruding plastic material and having two, three or four extrusion cylinders has a stationary part which is fixedly mounted on the discharge ends of the extrusion cylinders and has flow channels for directing extrudate leading from the cylinders to a central extrusion location at which there is a seat for an extrusion die. Two movable extrusion head parts are hinged on the stationary part for movement between a closed position in which the movable extrusion head parts define an extrusion orifice for the extrudate and hold the extrusion die on its seat and an open position for cleaning. The movable extrusion head parts are moved between open and closed position by piston-cylinder units having cylinders pivotally mounted on the stationary part and having piston rods pivotally connected to lugs on the movable extrusion head parts.

Abstract: An injecting unit for use in an injection molding machine comprises an arrangement for locking an axially movable plasticizing cylinder to a carrying block and for locking a feed screw to a motor for-rotating the feed screw, which is adapted to be coupled to the motor in that the feed screw is inserted into a profiled coupling section of the motor. The feed screw is axially displaceable for injecting the plastic material. The plasticizing cylinder is adapted to be locked at a stop of the carrying block by screw threads, which are provided on the plasticizing cylinder and are centered on the longitudinal axis of the cylinder, and a nut, which is screwed on the screw threads and rotatable by a drive engaging the periphery of the nut. When the plasticizing cylinder has thus been locked, the feed screw is locked to the feed screw motor. As a result, the plasticizing cylinder and the feed screw can reliably be locked and unlocked by simple arrangement, which can be automatically controlled.

Abstract: The invention pertains to a system for the co-extrusion of multiple layers of thermoplastic material. The invention employs a modular system concept which enables a manufacturer to quickly exchange components to accept melt flow from a number of extrusion injectors to provide a number of extrudate layers for shaping by a standard sheet extruder die.

Abstract: A molding flask structure for molding close tolerance articles, such as prosthetic dental devices. The flask structure includes upper and lower flask members that each include cup-recesses adapted to face each other to define therebetween a mold cavity when the flask members are connected together. Assembly of the flask members is effected by a plurality of connecting bolts to securely hold the flask members together. Vent passageways are provided in the flask members to extend from the mold cavity to permit excessive internal pressures to be relieved to the exterior of the flask member. A sprue opening defined by semi-cylindrical recesses in contacting faces of each of the flask members extends from the mold cavity to the exterior to permit the introduction of molding material into the mold cavity. The sprue opening is partially threaded and partially unthreaded.

Abstract: An extrusion calibrating apparatus connectable to external sources of cooling water and vacuum, and usable to calibrate the exterior profile of a hollow thermal plastic extrusion. The apparatus includes lower and upper cover plates each having a pair of vacuum manifolds therein, the lower cover plate being fixedly attachable to a stationary support. The apparatus further includes lower and upper vacuum plates each having a plurality of vacuum slots extending between a lower and an upper side thereof and in communication with a corresponding vacuum manifold. Each of the vacuum plates also has supply and return water channels providing communication between spaced-apart interior supply and return ports on an inward side thereof. A heat-conducting calibrating insert is removably positioned within an interior chamber between the vacuum plates with lower and upper sides in face-to-face juxtaposition with corresponding inward sides of the vacuum plates.

Abstract: A cross-head die assembly for applying a coating material, such as plastic insulation, to a continuous filament, such as an electrical wire, includes the usual body with axial bore, through which the filament is moved, and radial bore, through which the coating material is introduced. The assembly further includes a die member, a tip holder and a tip, all positioned and releasably held in assembled relation within the body axial bore. The tip holder includes an annular groove communicating with the body radial bore for flow of molten material through the radial bore and about the annular groove. A flow passage, preferably a plurality of axial grooves in the tip holder, provide flow of the molten material from the annular groove to the die member orifice.

Abstract: A stripper plate locking device for use with the mold in a molding machine (e.g., injection, compression or transfer) is presented. The mold has openings in each of the plates of the mold for accepting the stripper plate locking device. The device includes a release pin, a body member and a collet member. The pin has a shaft with a head disposed at one end and a first pair of camming surfaces with a shaft portion therebetween disposed at the other end. The body members has a second pair of camming surfaces with a cylindrical portion therebetween disposed at one end thereof and an opening therethrough wherein the shaft of the pin passes. The collet member has a plurality of expandable resilient fingers which define an opening. The collet member includes a third pair of camming surfaces with a first cylindrical section therebetween for expanding the fingers in cooperation with the first camming surface and the shaft portion of the pin.

Abstract: An arrangement for mixing and/or kneading of viscous, plastic, powder or grain materials, comprises a housing provided with a housing opening, a screw shaft driveably arranged in the housing opening and having a torque transmitting shaft and a plurality of screw elements arranged one behind the other on the shaft, a wedge connecting the screw elements with the shaft and having a substantially rectangular cross-section with two long sides and two short sides.

Abstract: In order not to have to rinse, during breaks in production, oscillating mixheads such as are used for the manufacture of free-flowing, plastic-forming reaction mixtures, an exchangeable insert part held in position by means of a clip and preferably consisting of plastic material is provided in the mixhead. The insert has a mixing chamber and an outlet channel. This insert part can be disposable or reusable.

Abstract: A spinning block for the melt spinning of polymers, consisting of a melt channel, a coupling which is attached to the spinning bar and a nozzle block casing with a filter element and a spinning nozzle plate. A connector for detachably securing said nozzle block casing to the coupling consists of at least two bolts which are positioned symmetrically and perpendicularly to the axis of spinning, which bolts engage cooperating grooves, of a particular configuration, also positioned symmetrically and concentrically to the spinning axis. The bolts can be fixed to the casing or to the coupling. The grooves are provided in the coupling or the casing to complement the location of the bolts. By rotation of the nozzle block casing with respect to the coupling around the spinning axis, the parts are locked together.

Abstract: An injection molding machine having a machine frame, an injection assembly coupled with the frame, a press assembly also coupled with the frame, a mold-mounting assembly coupled with the press assembly, and a mold pallet assembly secured to the press assembly by the mold mounting-assembly. The mold pallet assembly includes first and second mold pallet units which define a mold cavity when they are placed in a closed condition. The mold pallet assembly further includes alignment members which ensure correct alignment between the first and second mold pallet units when in a closed condition. The first mold pallet unit includes an injection assembly for engagement with the injection assembly. The mold-mounting assembly includes first and second mold-mounting devices, securing the first and second mold pallet units, respectively, to the press assembly. The mold-mounting assembly further includes a sensor which indicates the correct alignment of the mold pallet assembly relative to the press assembly.

Abstract: Cleaning of vacuum presses is facilitated by providing a vacuum press housing that is composed of pivotable housing elements which are in turn pivotally attached to the press frame. The horizontally hinged cylinder halves that serve as housing elements of the preliminary press are connected by way of a flange connection to a sieve plate holder which is likewise arranged on a U-shaped support of the press frame so that it is pivotally movable horizontally. Arranged displaceably at the other end of the press is a joint washer with radial and lateral sealing means. The vacuum chamber which can be raised and lowered vertically and which can be pivoted horizontally is releasably connected to the joint washer by snap closure means. Pivotal movement of the vacuum chamber is ensured by a hinge connection to the U-shaped support. The vacuum chamber is placed upon the filler opening of the lower press, and is secured by means of snap closure means.

Abstract: The invention relates to a mould for injection moulding machines, consisting of at least two halves of a mould, each half in turn consisting of a retaining plate and at least one mould insert fitted therein and centered relative to the retaining plate, and the front side of the mould insert is in alignment with the parting surface. The task involved is to ensure that the mould inserts can nevertheless be rapidly and easily replaced. The device is designed in such a way that the mould insert is held firmly without play, in the axial direction, i.e. transverse to the parting surface, between a thrust block acting on the back of the mould insert and at least one stop in the vicinity of the front side of the mould insert, and the thrust block can be steplessly adjusted in an axial direction relative to the retaining plate. In this way, mould inserts of any desired axial dimension can be used.

Abstract: An extrusion calibrating apparatus connectable to external sources of cooling water and vacuum, and usable to calibrate the exterior profile of a hollow thermal plastic extrusion. The apparatus includes lower and upper cover plates each having a pair of vacuum manifolds therein, the lower cover plate being fixedly attachable to a stationary support. The apparatus further includes lower and upper vacuum plates each having a plurality of vacuum slots extending between a lower and an upper side thereof and in communication with a corresponding vacuum manifold Each of the vacuum plates also has supply and return water channels providing communication between spaced-apart interior supply and return ports on an inward side thereof A heat-conducting calibrating insert is removably positioned within an interior chamber between the vacuum plates with lower and upper sides in face-to-face juxtaposition with corresponding inward sides of the vacuum plates.

Abstract: A plastics processing machine, in particular a blow moulding machine, with mould halves of a first product mould secured to movable mould clamping plates, and separate mould halves of a second product mould clamped onto the mould halves of the first product mould. The machine is operated with the mould halves of the first product mould to produce a first product line. During this operation, the mould halves for the second product mould are removed. The machine is operated with the mould halves for the second product line by attaching these mould halves to the mould halves of the first product mould.

Abstract: An injection molding machine includes a sub-mold hollow structure defining a plurality of sub-mold hollows which are formed in at least one of a fixed-side base plate and a movable-side base plate with a keyway being formed in the base plate in which the sub-mold hollow structure is formed. A changeable sub-mold is detachably mounted in each of the sub-mold hollows, and a comb-shaped fixing key is detachably engaged in the keyway and fixes the changeable sub-molds when the comb-like fixing key is inserted into the keyway.

Abstract: A vessel for duplicating dental models has at least two mold halves which can be clamped together. The mold halves have elements for mutually centering and for securing the model to be duplicated, for example, a tooth stump or the like. The vessel further includes an intake funnel each for pouring in liquid silicone and refractory casting material. A foil insert is provided in the plane of separation of the two mold halves when the vessel is closed. The foil insert has a thickness which corresponds in size to the setting expansion of the refractory casting material. The model to be duplicated is located in the center axis of the vessel and extends approximately by half its length through the foil insert and is held in position by the foil insert.

Abstract: A resin sealing apparatus includes upper and lower dies each having a chase block with a plurality of cavities into which molten resin is injected and a supporting member for supporting the chase block, the chase blocks of the upper and lower dies being fitted to each other, and a position determining member attached to each of the chase blocks so that the positions of the chase blocks are determined when they are assembled, wherein each of the chase blocks is attached to each of the supporting members so as to be movable in the vertical and lateral directions within given ranges.

Abstract: A molding machine has a mold material supply, a die setting assembly, separating and de-burring assemblies. The supply includes a mold material feed, an extruder for receiving a mold material from the mold material feed and extruding the mold material so as to form an extruded mold material, a cutter for cutting the extruded mold material, and a transfer assembly for receiving the extruded mold material from the cutter and transferring the same.

Abstract: A tire mold including a pair of shells (2) for molding the side walls of tire and a ring or sectors (1) for molding the tread of the tire and in which each sector (1) of the mold includes an outer support (10) and an inner mold fitting (11). The contact of the sectors with each other and of the sectors on each side wall molding shell (2) takes place via segments (3) of small cross section, compressed elastically upon the closing of the mold, so as to assure complete tightness of the mold.

Abstract: A heated injection molding nozzle having a rear member and a forward member which is removable. A channel extends through the rear and forward members to convey pressurized melt to one or more gates extending through the mold to a cavity. The rear member has an electrical heating element with a spiral portion which extends around the melt channel. The forward member has a tapered rear portion which extends rearwardly into a matching tapered well in the rear member. The taper is sufficient so the tapered portion is frictionally retained in the well to removably mount the forward member to the rear member. This allows the forward member to be easily turned or driven out of engagement in the well to replace it with a new forward member or a forward member having a different configuration to provide a different type or arrangement of gating.

Abstract: A device producing a weather strip is shown, which includes (a) leading a first uncured pasty material into a certain shaping passage to produce an uncured shaped molded strap; (b) applying continuously a second uncured pasty material onto a given portion of the uncured shaped molded strap while the latter is being moved in the certain shaping passage thereby to produce a layered uncured shaped molded strap; and (c) curing the layered uncured shaped molded strap.

Abstract: A compact and precision extrusion system for extruding strips of rubber compounds with profiles of accurate dimensions. Strips of rubber compound are uniformly heated and mixed in an extruder and then passed through a low pressure drop strainer to remove foreign matter. The strained compound then is fed directly into a gear pump which delivers precise volumes of the rubber compound immediately into the spread chamber of an extrusion head after which it passes through a die to form a precise strip of the rubber compound. The strainer and extrusion head are movably mounted with respect to the gear pump for axial separation from the gear pump for easy removal of the rubber compound from the various components of the system to facilitate compound changes. A control system regulates the speed of the extruder to provide a near constant pressure at the entrance port of the gear pump to precisely regulate the rate of extrusion of the compound from the extrusion head.

Abstract: A master frame supports interchangeable mold inserts, each of which is provided with its own electrical heater and associated wiring. A recess is provided in the master frame to allow for lateral movement of the wiring, heater and mold inserts as a unit during installation and replacement. A closure member in the form of a thermocouple retainer is provided to support a temperature-controlling thermocouple inwardly of a hole within each mold insert as well as to close the recess during a molding operation.

Abstract: A tire-vulcanizing mold including a profiled segment. In order to assure a safe gas discharge from the cavity formed in the tire-vulcanizing mold during the forming of the tire blanks, the invention provides that the profiled segment be divided along at least one interface into at least two partial profiled segments, that the interface extends substantially parallel to a plane of rotation in relationship to the tire mold, and that the interface cuts the areas of the tire-vulcanizing mold to be vented. Manufacture of the segments is done much that the profiled segment is first manufactured in one piece and is thereafter divided into the partial profiled segments by a cutting operation leaving behind a narrow cutting line.

Abstract: In a plasticizing assembly for use in an injection molding machine, which assembly has a high-pressure chamber and a low-pressure chamber, which contains the feed screw, and a plurality of fixing screws disposed on a circular line, a connecting sleeve is provided, which partly surrounds the plasticizing cylinder or a rear section of a bipartite plasticizing cylinder and surrounds also the nozzle body or a forward section of a bipartite plasticizing cylinder in part of its length and is secured to the plasticizing cylinder or to its rear section. The fixing screws are screwed in and axially supported in tapped bores of the connecting sleeve and at their end faces bear on abutment faces of the nozzle body or of the forward section of the plasticizing cylinder.

Abstract: Injection molding takes place in a molding chamber which is formed between a core-defining member as part of a mold core assembly and a cavity-defining member as part of a mold cavity assembly. One removes a first mold core and mold cavity-defining member from the mold core and mold cavity assemblies when desired molding by means thereof has been accomplished, and replaces them with a new core-defining member and cavity-defining member to form a molding chamber of a different design. These are respectively secured to the remainder of the mold core assembly and mold cavity assembly, so that the main portions of the mold core and mold cavity assemblies may be retained in a mold press, and differing products may be manufactured.

Abstract: In a mold clamping device for clamping a mold to, and unclamping the mold from, a mold mounting member of a tire vulcanizing machine, a locking member has a neck section projectingly installed on the mounting surface of a mold. A guide hole of the mold mounting member, in which the locking member is inserted, has a larger-diameter section in a portion corresponding to the neck section. A chuck member has an expansion section which is slidably inserted in the guide hole, and expands in the larger-diameter section, engaging the neck section in the guide hole. A chuck withdrawing device withdraws the chuck member into the guide hole.

Abstract: An injection mold capable of being filled from the center is a gated mold with at least one repositionable subgate. The subgate permits simplified removal of the central portion of the molded article, while at least substantially eliminating secondary treatment of the molded article.

Abstract: A plurality of cores are covered with the same jacketing material by passing the cores through respective dies of a plate, while flowing the jacketing material through sub-channels in the plate and into coating relationship with the cores. Any of the sub-channels can be shut off by diverting the jacketing material a flow diverting path without affecting the flow in the other sub-channels.

Abstract: The present invention provides a novel eyeplate apparatus which permits logs to be extruded in a dual extrusion process whereby the aesthetic quality of the inner and outer log faces of the extruded logs is comparable. In a preferred embodiment, the eyeplate is used in combination with upper and lower eyeplate baffles in the nosecone of a plodder.

Abstract: The components forming the layers of a composite pipe are successively introduced into a rotary drum (1). Initially, a plastic reinforcing layer (8), including a fibre reinforcement, is introduced into the drum, the ends of the drum (1) being bounded by rings. A concrete core layer (16) is then introduced and the length of the core layer (16) is shortened relative to that of the drum (1) by shaping rings fixed to the drum ends. The shaping rings are then replaced by other shaping rings (20, 21) so that, on either side of the core layer (16), two annular spaces (22, 23) are formed which are filled by a socket material (24, 25) of the same composite as the reinforcing layer (8). Thus, at one pipe end a socket end (28) is formed and at the other pipe end a spigot end (30) is formed, each such end being located within the composite pipe wall thickness. After introducing a second reinforcing layer (26), the production of the composite pipe is completed.

Abstract: A multi-part extrusion die is disclosed which not only permits the formation of thin discharge slots down to about 0.003 or 0.002 inches, but also provides the ability to produce a die for forming a honeycomb article with different cell densities and web thicknesses in various sections. A plurality of individual die parts are each provided with discharge slots in a discharge face thereof of desired width and spacing, and then a plurality of such individual die parts are secured together in a desired alignment such that the discharge face of each of the plurality of die parts forms a continuous discharge face for the multi-part extrusion die.