Abstract: A method of manufacturing a rubber sheet with rugged patterns formed on one side surface portion includes the step of preparing an apparatus including a rotating roll having rugged patterns, a member having an arcuate inner surface radially spaced apart from an outer peripheral surface of the rotating roll, and a die. The arcuate inner surface is recessed away from the rotating roll and defines an arcuate compartment chamber together with the outer peripheral surface of the rotating roll. The arcuate compartment chamber, has an inlet port and an outlet port. The die is placed in such a manner to adjoin to the outlet port portion of the compartment chamber, the die having an inner edge portion which is radially spaced apart from the outer peripheral surface of the rotating roll and defines an extrusive clearance together with the outer peripheral surface.

Abstract: A die assembly (10) for controlling extrudate profile dimension. The die assembly includes a die block (12) having a feed passage (16) for movably supporting a diverter member (13) within the die block, and first and second die block passages (18, 20). The diverter member (13) includes a diverter passage (32) and first and second feed openings (34, 36) interconnected by the diverter passage. One of the first or second feed openings (34, 36) has a larger diameter than the other of the first or second feed openings. The diverter member (13) is movable with respect to the die block (12) for directing extrudate flow via the diverter passage (32) through the second die block passage (20), to thereby vary the profile dimension of the extrudate exiting the die block. The die block (12) additionally includes a disposal passage (22).

Abstract: A foil-blowing head has a nozzle lip which is substantially cylindrical and of an axial length of at least several centimeters and a radial thickness of at least several millimeters. High-force servoeffectors which can be provided with stepping servomotors, speed-reduction transmissions and eccentric drivers, can act upon radial rods to deform the lip and adjust the gap width and the thickness of the foil which is produced to provide continuous thickness correction during foil blowing.

Abstract: An extrusion method for obtaining a long phenolic resin pipe having excellent heat resistance by using an extruder having a screw, a cylinder, a die and a mandrel, the mandrel being inserted into a through-hole formed in the screw along the screw axis and protruding into the die along the screw axis, the die satisfying the following formulasR.sub.1 /R.sub.2 =0.25.about.1.0S.sub.1 /S.sub.2 =0.1.about.2.5where R.sub.1 is an outside diameter of the die flow path at the die outlet, S.sub.1 is a cross-sectional area of the die flow path at the die outlet, R.sub.2 is an outside diameter of the die flow path at the die inlet, and S.sub.2 is a cross-sectional area of the die flow path at the die inlet, and the inclination of the outer periphery of the die flow path portion from the die inlet to a starting point of the uniform flow path portion having the same cross section as the die outlet is not larger than 35.degree.

Abstract: Apparatus for discharging sheets having skins on them and different patterns, characteristics, and properties. One or more rollers, belts, plates, or combinations thereof, having cavities and projections of desired patterns formed on their surfaces, pass through low pressure liquefied extrudable materials to be bathed thereby and pass by another surface(s). Heating or cooling is applied as appropriate to the roller(s), plate(s), belt(s), to form a skin on the extrudate and/or set same. A distributed low pressure, mixed orientation, low gas, liquefied extrudable material is generated using a vented barrel assembly and manifold mechanism. By using a dynamic moving die surface, bathed in a low pressure material chamber, rather than extrudable material forced through a fixed die opening as is normally done in extrusion processes, a product with low stress and one that exhibits isotropic properties results.

Abstract: An automobile windshield molding is produced by a molding machine having dies. A method of producing the molding includes the step of extruding molding material through a hollow portion formed by the dies. The shape of the hollow portion is changed by moving the dies according to the cross-sectional shape of the molding, thereby widening part of the hollow portion of the dies to increase the thickness of the molding material. One of the dies is projected into the widened part of the hollow portion to form a water drain channel on a large thickness portion of the molding.

Abstract: A method of and apparatus for molding a tubular part consisting of two lengthwise continuous portions of different cross-sectional shapes. The method involves extending or retracting a movable die of the apparatus with respect to an extrusion molding port thereof, which is formed by inserting a core in a non-projecting state in an extrusion opening in a die body, so as to regulate an extrusion rate by discharging a part of a raw molding material, and extruding the molding material while controlling the cross-sectional shape of the outer circumferential surface of the material being extruded, by a molding surface at the front end of the movable die, whereby the crosssectional shapes of the inner and outer circumferential surfaces of the material being extruded are varied.

Abstract: A composite parison generally cylindrical in shape and including two or more plastic materials different in characteristic is formed. Using this composite parison, a hollow plastic product of any desired shape having a locally different characteristic, such as in softness, heat-resistance or wear-resistance, can be manufactured with ease, for example, by conventional blow molding.

Abstract: A bent pipe forming apparatus is provided for extruding and forming a fluid material into an annular member. The apparatus has a central mandrel and a die defining an annular gap between the mandrel and the die. One of the mandrel and the die is supported to move in a direction perpendicular to an axis of the mandrel. The movable mandrel or die is provided, on its outer periphery, with a guide circular surface integral therewith. An inner movable ring having inner and outer circular peripheries eccentric to each other is rotatably fitted on the guide surface. An outer movable ring having inner and outer circular peripheries eccentric to each other is rotatably fitted on the periphery of the inner movable ring. The outer movable ring is provided with an outer circular periphery which is rotatably fitted in a stationary circular guide surface. Driving motors are provided to independently move the inner and outer movable rings.

Abstract: The present invention provides a novel extrusion apparatus that is advantageous for converging rheologically dissimilar streams. Flow transition of a converging stream can be beneficially effected. For instance, a converging stream may be specially contoured by mere mechanical adjustment of a flow-restricting member of the apparatus.

Abstract: An open tube apparatus and method for continuously producing a rotating elongate strip of material are disclosed. An extrusion die continuously extrudes flowable material to form an open tube with a central longitudinal cavity and a transport mechanism includes a plurality of drive rollers which engage and pull the tube downline. A driver rotates the extrusion die and transport mechanism. A tube cutter, which is offset at an angle with respect to the downline direction and defines the open end of the tube, cuts the tube into a continuous elongate web of the desired width as the tube moves downline. An air seal seals the tube cavity to prevent air from escaping through the open end of the cavity, and a tube pressurizer controls air pressure in the central longitudinal cavity of the tube to expand the tube laterally outwardly.

Abstract: An accumulator head for an extrusion-blow molding machine. The accumulator head includes an annular inner sleeve member slidably positioned within an accumulator outer barrel, and a tubular inner body member received within the sleeve member. The sleeve member and body member are adapted to be slidable together within the accumulator barrel to expel collected plasticated material. The inner sleeve member includes a pair of external slots formed in the outer surface that communicate with the accumulator inlet and with respective radially extending flow passageways through the inner sleeve to convey plasticated material from the accumulator inlet into a pair of helical flow channels formed in the accumulator inner body member. The flow channels communicate with an outlet area to convey the plasticated material to an inner accumulation chamber through an annular collector channel and an annular flow passageway that provides an extruded parison having a uniform conformation without flow or separation lines.

Abstract: A process for continuously producing an irregular shaped hollow molding includes the steps of extruding a molding material from a molding opening to form the first portion of the hollow molding, and continuously passing the molding material extruded from the molding opening through a molding clearance or molding opening to form the second portion of the hollow molding after the desired length of first portion is obtained. One of the forming steps of the first and second portions includes a step for discharging an excessive molding material.

Abstract: A foil-blowing apparatus has at least one deformable lip defining the annular orifice from which the thermoplastic tube which is blown to form the coil is extruded. The lip can be provided with an array of effectors which, in response to a thickness-profile measuring unit, can radially deform the lip to correct thickness errors. The lip can be under prestress and the radial deformation is effected by measuring the thickness and superimposing a radial force on the prestress.

Abstract: Coextrusion apparatus for varying the outer profile of a generally tubular extrudate formed by inner and outer streams of elastomeric material by varying the annular end opening of an elastic die ring which varies the size of an outer extrusion orifice and consequently the flow of the outer stream of elastomeric material which is deposited on the outer surface of the tubular extrudate. A hydraulically moveable piston is axially slideably mounted for engagement with the elastic die ring and has a wedge-shaped camming surface which moves along the outer surface of the elastic die ring to vary the size of the outer extrusion orifice and consequently the amount of elastomeric material extrudated therethrough. A linear motion detector is connected to the piston to detect the amount of linear axial movement of the piston to provide control signals for controlling the movement of the piston.

Abstract: A nozzle device for extruding multiple synthetic resins as a resin composite, including a main extrusion flow passage having a main extrusion opening, a subsidiary extrusion flow passage having a subsidiary extrusion opening, at least a downstream portion of the subsidiary extrusion flow passage being disposed in the main extrusion flow passage, and an opening-closing member for opening or closing the subsidiary extrusion opening. The nozzle device has an auxiliary extrusion flow passage which has an auxiliary extrusion opening and at least a downstream portion of which extends through the main extrusion flow passage as it surrounds the downstream portion of the subsidiary extrusion flow passage. The auxiliary extrusion opening is positioned downstream of the subsidiary extrusion opening and the downstream end portion of the auxiliary extrusion flow passage has a tapered part.

Abstract: A marbleized thermplastic-resin strand is made from a matrix resin and an inlay resin in an apparatus having a die forming a passage extending along an axis and havng an upstream inlet end and a downstream outlet end and an extruder for injecting the matrix resin in hot liquefied condition into the passage at the upstream end thereof such that the resin emerges from the downstrea end. An inlay nozzle opens into the passage between its ends and extends through the die along a nozzle axis not parallel to the passage axis. The inlay resin is fed in hot liquefied condition through the nozzle into the passage such that the inlay resin mixes with the matrix resin. The inlay nozzle is rotated substantially continuously about its nozzle axis so long as the extruder is operating. Thus the patterning of the inlay resin in the matrix resin is a function of the rotation speed of the inlay nozzle.

Abstract: A multi-layer parison has a plurality of layers of main and auxiliary resins laminated with each other. An apparatus for forming the multi-layer parison includes a main resin extruding mechanism, at least one auxiliary resin extruding mechanism and a control unit for controlling the main and auxiliary resin extruding mechanisms so that the pressure for extruding the auxiliary resin is immediately increased and the pressure for extruding the main resin is gradually increased at the beginning of extrusion of the main and auxiliary resins.

Abstract: Coextrusion apparatus for varying the outer profile of a generally tubular extrudate formed by merging inner and outer streams of elastomeric material by varying the size of the annular outer extrusion die opening by an axially moveable die ring which varies the flow of the outer stream of elastomeric material which is deposited on the outer surface of the tubular extrudate. The die ring is formed on the end of a hydraulically moveable piston and is axially slideably moved along and is located concentrically about the tubular extrudate. A first annular tapered surface of the die ring moves along a similar tapered surface of a fixed conical-shaped die pin to vary the size of the outer extrusion orifice formed therebetween.

Abstract: A die assembly for configuring extrudate flow is provided. The die assembly includes a die head having a feed member passage, first and second die head passages, and first and second die surfaces respectively associated with the first and second die head passages. The die head passages are located intermediate the corresponding die surfaces and the feed member passage. A feed member is supported in the feed member passage of the die head and has a feed passage and a feed opening for supplying extrudate to the die head. The feed member is supported for relative movement within the die head whereby the feed opening may be moved to communicate with either the first die head passage or the second die head passage. The central axis feed of the feed opening is moveable with respect to the central axis of the first or second die head passage to correspondingly configure extrudate exiting the respective die head passage when the feed opening is in communication with this die head passage.

Abstract: An apparatus is provided for the continuous coating of cylindrical workpieces with a mixture of rubber or thermoplastic plastics material. The arrangement includes an extrusion device, a coating head and a flow channel, which connects the extrusion device to the coating head. The coating head includes a hollow barrel, having a rotatable sleeve-shaped material distributor coaxially disposed therein. One or more conveyor flights are helically disposed on the periphery of the distributor. The discharge opening of the flow channel into the coating head end has a dimension corresponding to an axial pitch length of the flights on the periphery of the distributor.

Abstract: Coextrusion apparatus for varying the inner profile of a generally tubular extrudate formed by a first stream of elastomeric material by an axially movable inner die ring which varies the size of an orifice and consequently the flow of a second stream of elastomeric material which is deposited on the inner surface of the tubular extrudate. A compensating ring is axially slidably mounted within the inner die ring and moves generally in an opposite direction to the movement of the die ring to compensate for pressure changes within the second stream of material caused by varying the size of the orifice, to provide an accurately controlled initiation and termination of the material. Pistons are formed integrally on the inner die ring and compensating ring and are located within annular fluid pressure chambers whereby the flow of fluid into the chambers will coordinate the movement of the die ring and compensating ring.

Abstract: Apparatus for producing flexible kink resistant tubing having one or more non-reinforced section(s) and one or more spirally-reinforced section(s). The apparatus includes a rotatable member having an extrusion passgeway for extruding a second thermoplastic material in a filament within a first thermoplastic material to form a reinforcing filament in tubing formed by the first thermoplastic material. The rotatable member is rotated at a predetermined velocity to form the reinforcing filament in a spiral or helical pattern in the wall of the tubing. A diverter valve is provided for selectively providing the second thermoplastic material so that filament reinforced and non-reinforced longitudinal sections of tubing may be formed without interruption. A method of producing such kink resistant tubing is also disclosed.

Abstract: A parison forming device is disclosed for forming hollow polymer extrudes of variable wall thickness in either the circumferential or longitudinal directions, or in any combination thereof. The parison forming device consists of a die-head assembly and mandrel assembly, concentrically arranged, creating an annual opening. The inner or outer circumferential perimeter of the annular opening may be selectively modified at specific radial locations through radially displaceable slides positioned about the annular opening. The slides, attached to either the die-head assembly or mandrel assembly, may be actuated during parison formation via hydraulic or other methods so as to provide suitable wall thickness profiles for later finished polymer products.

Abstract: An apparatus for manufacturing large-volume hollow bodies of plastics material with multiple-layer walls. The apparatus defines an accumulation chamber and has a nozzle outlet. A plurality of material layers are joined into a multiple-layer plastic material melt within a tubular plunger which is movable in axial direction of the apparatus. The multiple-layer plastics material melt is conducted in a flow duct which widens in the shape of a funnel toward the accumulation chamber. The tubular plunger is forced by the melt to move in axial direction away from the nozzle outlet. The material melt is ejected as a multiple-layer extruded material by moving the tubular plunger in axial direction toward the nozzle outlet.

Abstract: A method for producing a spiral pipe with a rib includes continuously extruding a thermoplastic synthetic resin material in a molten state into a tubular form so as to have a diameter and a predetermined wall thickness of a tubular body to be formed, and winding a rib-portion material in a molten state having a hollow shape or a solid shape in section extruded by an extrusion nozzle rotated about the outer periphery of the extruded and molded tubular body relative to the extrusion speed for the extruded and molded tubular body to integrally form a hollow or solid spiral member.

Abstract: A method of producing a thread-reinforced, extruded rubber body by a shear head wherein the threads are continuously supplied, embedded in a rubber mixture which is in a continuous forward motion and fixed in the rubber body by vulcanizing the rubber mixture. The method is such that the reinforcing threads are helically twisted in the finished rubber body. The rubber body is thus reinforced not only in longitudinal direction but also additionally in circumferential direction.

Abstract: A component is fabricated by depositing a succession of overlying beads of a material, the pattern and position of the beads being assigned the proper characteristics of the corresponding section of the desired component. Shape definition is accomplished by characterizing the component as a series of sections or slices having the thickness of the bead, and programming a computer-controlled deposition head to deposit a succession of beads with the respective patterns and positions. Deposition is preferably by precision laser welding. Complex shapes having properties comparable to properties of forged or cast material are readily prepared. The material used in successive beads may be varied, producing a component of graded composition to achieve particular properties in various regions.

Abstract: In the discontinuous manufacture of multilayer, co-extruded, hose-like thermoplastics material preforms used in the production of large volume multilayer hollow members in a divided blow mold, at least two different annular shaped material melts are brought together in series within an axially extending annular piston to form a multilayer material melt. An annular flow channel in the piston receives the layers of material melt. The flow channel widens in a funnel-like manner toward an annular storage space. The preform is subsequently ejected from the storage space through an annular nozzle gap by the annular piston moving in its axial direction. The annular piston acts as a co-extrusion head and is pressed upward by the multilayer material melts. In supplying the material melts from extruders into the flow channel of the piston, the material melts flow first in the extrusion direction and then are redirected for flow radially inwardly into the flow channel of the piston.

Abstract: An apparatus and method for forming a strip of elastomeric material which is extruded onto a rotating roller where it is initially shaped by a die plate and then finally shaped by a calender roll positioned downstream from the die plate and in close proximity to the surface of the roller providing a finishing gap for finally shaping the strip of elastomeric material. The calender roll may be positioned on the opposite side of the roller from the position the elastomeric material is extruded onto the roller whereby the calender roll resists forces tending to bend the roller. The extruder screw may have a downstream end adjacent the roller for reducing the pressure and for self-cleaning the apparatus.

Abstract: An apparatus for extruding stepped extrusions, e.g. of aluminum or aluminium alloy, comprises a die holder carrying a major die, and a split minor die arranged for abutment with the downstream side of the major die and having its two halves mounted on respective parts of a split holder. The holder parts are movable towards and away from the line of extrusion to put together and separate the halves of the minor die. The die holder and the container of an extruder are movable towards each other to press the minor die the major die and the downstream face of the container into sealing engagement about the die apertures, and are movable away from each other to permit the extrusion to be sheared off between the container and the major die.

Abstract: The invention concerns a process and an apparatus for the production of hollow bodies from thermoplastic material, the wall of which is in the form of a laminate, by extrusion blow molding. Tubular preforms for making the hollow bodies are first produced in an intermittent mode of operation, the wall thereof also being in the form of a laminate which includes a suitable number of layers. Within an extrusion head having an annular storage chamber for receiving the laminate-formation preform and an annular piston for emptying the storage chamber, the flows of material for forming the layers of the laminate of the preform are passed through the annular piston into the storage chamber in which they combine to form the laminate. The width of the outlets at which the flows of material issue from the annular piston can be so selected that it is proportional to the thickness of the respective layers to be formed therefrom in the laminate produced in the storage chamber.

Abstract: Apparatus for the extrusion-coating of a core, especially of an electrical conductor, with a sheathing having at least two layers or strips of different materials or differently colored materials, the apparatus having feed conduits for the plasticized materials and outflow passageways through which the core to be extrusion-coated can pass, the outflow passageways being selectively connectable to the feed conduits via a distributor device. In order to avoid the need for cleaning the conduits of the distributor device, the distributor device is formed by a sleeve (8) which is arranged rotatably between end positions in relation to an outer housing (1) having feed conduits (2, 3) for the plasticized materials. The sleeve also has a number of conduits corresponding to the number of materials to be extruded, to connect feed conduits (2, 3) alternately to the outflow cross-sections (15, 20) for the plasticized materials.

Abstract: The present invention is directed to a toy molder/extruder which is used for cold molding and/or cold extruding of clay dough with the use of toy molds and toy dies. This toy has a main housing with a base, an upright middle section and a top. A pinion gear is rotatably located at the top of the housing and a crank wheel and handle is connected to the pinion gear to enable the user to rotate the pinion gear. A ram piston with a rack gear is attached to the main housing with the ram piston being connected to the top of the housing in a vertically movable fashion, so as to engage the rack gear and the pinion gear with on another. The toy also has a compression chamber with an open top which is connected to the housing and located below the ram piston. It has a cross-sectional dimension adequate to allow ram insertion of the ram piston and has a tapered bottom with an outlet orifice substantially smaller than the compression chamber's open top.

Abstract: An extrusion die slot for extruding flat thermoplastic webs has a plurality of plates mounted to the flexible lip of the die body. A regulating force from a control element is applied to the plates, and so to the flexible lip, via the flexible strip pressed between the control element and the plates.

Abstract: A T-shaped film extrusion die having a T-shaped die main body, a device for detecting the thickness of a resin film formed by extrusion to generate a detection signal, a device for generating a correction signal on the basis of a difference between the detection signal and preset thickness data, and a lip-width adjusting device for driving lip-width adjusting bolts on the basis of the correction signal to adjust the width between lips of the die so that the resin film has a preset thickness.

Abstract: This invention relates in general to the formation of thick films having a biaxial molecular orientation. Such films are prepared in accordance with the present invention from rod-like extended chain aromatic-heterocyclic ordered polymers. Such films have high tensile strength, modulus, and environmental resistance characteristics. A preferred ordered polymer for use in the present invention is poly (para--phenylenebenzo bisthiazole), (PBT), a compound having the structure: ##STR1## The present invention is also directed to methods and apparatus suitable for producing biaxially oriented films, coatings, and like materials from ordered polymers, preferably PBT.

Abstract: The invention relates to a blow molding machine for the blow molding of hollow articles, with an accumulator head (1) for producing a preform and with a blow mold for forming a hollow article from the preform. After completion of a blow molding sequence, a piston positioning signal is derived by a control system (15), to regulate the position of a discharge piston (4) in the accumulator head (1), from a comparative signal of the actual position and set position of the discharge piston (4). The set position is determined by integration from a previously specified speed set point profile. The control system (15) further superimposes an influx signal on the comparative signal, which corresponds to the change in volume of plastic flowing from an extruder (2) to replace the discharged contents of the accumulator head (1).

Abstract: Auxiliary or stub augers are used in conjunction with a convention auger machine that is used to form reinforced hollow cored slabs. They can be used to ensure consolidation of concrete above the cores particularly and relatively in large diameter slabs or can be substituted for one or more of the conventional core forming augers if a core or bore is not required in the slab at that location. The stub auger consists of a first portion having a non tapering shaft and a non tapering flight thereon. The second or downstream portion has a gradually reducing diameter shaft with the flight which continues from the flight around the first portion, decreasing in diameter to substantially zero at the extreme downstream end of the shaft.

Abstract: A blow molding machine for the blow molding of hollow articles includes an accumulator head (1) for producing a preform and a blow mold for forming a hollow article from the preform. After completion of a blow molding sequence and the filling of the accumulator head (1), a piston positioning signal is sent by a control system (15) to regulate the position of a discharge piston (4) in the accumulator head (1) derived from a comparative signal of the actual position and set position of the discharge piston (4). The set position is determined by integration from a previously specified speed set point profile. The control system (15) further superimposes an influx signal on the comparative signal, which corresponds to the change in volume of plastic flowing from an extruder (2) to replace the discharged contents of the accumulator head (1).

Abstract: Disclosed is a method and apparatus for producing a flexible tube of a thermoplastic resin having poor melt flowability by melting a thermoplastic resin having poor melt flowability in a screw extruder, and melt-extruding the molten thermoplastic resin from a tube die having an L/D of 30-70 provided at a mandrel rotatable with the rotation of the screw.

Abstract: This invention relates in general to the formation of thick films having a biaxial molecular orientation. Such films are prepared in accordance with the present invention from rod-like extended chain aromatic-heterocyclic ordered polymers. Such films have high tensile strength, modulus, and environmental resistance characteristics.A preferred ordered polymer for use in the present invention is poly (para - phenylenebenzo bisthiazole), (PBT), a compound having the structure: ##STR1## The present invention is also directed to methods and apparatus suitable for producing biaxially oriented films, coatings, and like materials from ordered polymers, preferably PBT.

Abstract: A method for manufacturing large-volume hollow bodies of plastics material with multiple-layer walls. The apparatus defines an accumulation chamber and has a nozzle outlet. A plurality of material layers are joined into a multiple-layer plastic material melt within a tubular plunger which is movable in axial direction of the apparatus. The multiple-layer plastics material melt is conducted in a flow duct which widens in the shape of a funnel toward the accumulation chamber. The tubular plunger is forced by the melt to move in axial direction away from the nozzle outlet. The material melt is ejected as a multiple-layer extruded material by moving the tubular plunger in axial direction toward the nozzle outlet.

Abstract: An apparatus for the production of a collagen tube to be used as a vascular prostheses or nerve suture, including a cylindrical tubular spinneret having a feed end for an aqueous solution of collagen gel and a discharge end and a coagulant tube concentrically disposed in the spinneret with all around circumferential clearance and terminating upstream of the discharge wherein a tube of aqueous acid collagen gel is extruded through the clearance around the coagulant tube. The coagulant tube has its inner wall contacted with a coagulating solution emerging therefrom before the tube of aqueous collagen gel reaches the discharge end of the cylindrical tubular spinneret. The discharge end of the tubular spinneret terminates in a bath of coagulating solution and a bed is disposed in the bath to receive the extruded collagen tube from the end of the tubular spinneret. The tubular spinneret is capable of being displaced with respect to the bath.

Abstract: A rotary roll extruder which performs shaping of material to be extruded such as raw rubber, or the like by ejecting the material to be extruded through a mouth piece by means of an extruding roll. This extruder comprises mouth piece moving means for moving a mouth piece in a radial direction of an extruding roll to make the mouth piece approach, or separate from, the circumferential surface of the extruding roll, mouth piece positioning means for positioning the mouth piece when the mouth piece is held apart from the extruding roll, and mouth piece stocking means for preliminarily stocking various kinds of mouth pieces. Shaping of the material to be extruded is effected when the mouth piece has been brought close to the circumferential surface of the extruding roll by the mouth piece moving means and it has been positioned by the mouth piece positioning means.

Abstract: A die assembly is described for causing extrudate to bend without substantially changing the cross sectional shape of the extrudate. The assembly includes a die mounted in spaced relation from a feed channel through which extrudate passes from the extruder including a first part which has a flow channel which has at least one pair of sidewalls which converge from the die in the direction of the extruder. A second part of the assembly has a feed opening for directing extrudate into the flow channel. It provides for varying the length of the pathways which extrudate flows through the flow channel to a pair of opposing sides of the die to cause bending of the extrudate in the direction of the longest pathway as the extrudate exits the die.

Abstract: An accumulator extrusion head assembly for producing a parison having at least one stripe extending longitudinally thereof comprises an extrusion head body member having an opening extending inwardly from a nozzle outlet end and a mandrel positioned in the body member to define a generally annular extrusion chamber terminating in an annular outlet nozzle. An annular ram is mounted in the extrusion chamber and has a forward end positioned for reciprocation toward and away from the outlet nozzle. A first supply extruder is connected to the body member through first passages for supplying a first extrusion material to the annular extrusion chamber. A second supply extruder is also connected to the body member through second passages for supplying a second extrusion material to the annular extrusion chamber.

Abstract: A system for producing a screw feeder for use in a plastic injection-molding machine, according to which system a molten material is extruded through an injection opening of a rotating die, the injection opening of the die including a groove obliquely with respect to the axis thereof, thereby forming a screw feeder having a shank and a spiral integral lengthwise therewith.

Abstract: An extrusion molding equipment for a multi-layer parison which includes an operation position detecting device for detecting an operation position of an accumulator extruding an layer of resin material invisible from outside the parison. A pressure detecting device is provided for detecting pressure of the inner resin material in an inner resin conduit. An extrusion amount control device for the inner resin material is also provided for controlling an extrusion amount of the inner resin by the use of a signal indicating the operation position from the operation position detecting device, and a signal indicating the pressure from the pressure detecting device.

Abstract: Long lengths of a heat-shrinkable sleeve for use in splicing electrical cables and the like are manufactured by providing an elongated impermeable core having a smooth outer surface, extruding an elongated sleeve around and in contact with the core, the sleeve having a smooth inner surface conforming to the outer surface of the core, and effecting an initial expansion of a portion of the sleeve to a larger diameter in an expansion zone so that the sleeve separates from the core and leaves a space between the sleeve and core. A fluid is introduced into the space under pressure via a fitting at the downstream end of the sleeve while continuously advancing the sleeve and core through the expansion zone. To begin the process, a permeable core is used, and the sleeve is extruded around and in contact with the permeable core.