Abstract: A thermoplastic pipe extrusion die having an adjustment section in a radial portion of the die channel provides excellent control of final pipe wall thickness uniformity.

Abstract: A process is disclosed for the formation of pipe comprising one or more layers of thermoplastic resin whereby an annular stream of thermoplastic material is transported through an annular extrusion passageway. The downstream annular portion of the extrusion passageway has a radially movable outer wall. The outer wall is radially moved by heat expansion of a bolt thereagainst to change the thickness of a particular arcuate section of the stream. The thickness of the particular arcuate section of the stream may be further changed through selectively heating by electrical resistive elements an arcuate section of the extrusion passageway to heat the stream of thermoplastic material transported in proximity thereto.

Abstract: A diverter and coextrusion diverter are described which include means for adjusting the cavity of the diverter so as to control the uniformity of extrudate exiting the diverter. The diverter including a gap having beveled opposing faces.

Abstract: Disclosed is an apparatus and process for producing multiple-layer film or sheeting which includes an improved laydown means comprising adjustable cam-actuated control means for controlling the polymer flow and individual layer thickness.

Abstract: Disclosed is an adjustable sliding mold assembled of two angular mold pieces slidably engaging each other at two mating surfaces. Adjusting means, preferably in the form of a spindle, is hinged to an outer side of a mold part to move the same transversely to the extrusion channel. The movable mold part is formed with an arcuate guide surface extending transversely to the extrusion channel and cooperating with a stationary complementary bearing surface so that during adjustment of the width of the extrusion channel the guiding surface automatically adjusts the taper of the channel.

Abstract: A sealable discharge die for thermoplastics, comprising a housing, a dieplate which closes the latter except for perforations for discharge of the plastic melt in strands or filaments, and a perforated plate located immediately below or above this dieplate, one of the plates being slidable or rotatable and the perforated plate having orifices which can be brought into alignment with the perforations of the dieplate.

Abstract: Pressurized colored liquids are inserted in the base mass, immediately upstream or in correspondence with the last homogenizing means; then a rotor arranged between the last perforated refining means and the extrusion hole, provides for a partial mixing of the paste. The speed of rotation of the rotor is adjustable from outside of the extrusion head, and independent of the speed of the extrusion screw.

Abstract: Improved extrusion head for use in forming plastic containers or tubular films (optionally with multi-ply walls) by the extrusion-blowing process. The typical extrusion head used in this process has flat compensating rings bounding a portion of the frustoconical flow passages which ultimately feed the extrusion orifice. These are replaced by spherical segmental rings having a beveled surface in the form of a spherical, conical, toric or ogival shape which bounds said flow passage and thus eliminates stagnating recesses (of the type encountered through use of the prior art flat rings).

Abstract: An adjustable extrusion die assembly forming part of an extruder for an elastic material, comprises: a stationary die member having an end surface; a plurality of movable die members positioned in side-by-side relationship to one another and slidably contacted with one another, the movable die members respectively having end surfaces opposing to and spaced apart from the end surface of the stationary member, the end surfaces of the stationary and movable die members defining in combination an extrusion opening through which the elastic material is to be extruded, the movable die members being individually movable toward and away from the end surface of the stationary die member with respect to one another so as to vary the distances between the end surface of the stationary die member and the end surfaces of the movable die members; a guide member having formed therein a guide slit having the movable die members guided therein; and a plurality of link members each interconnecting two adjacent movable die memb

Abstract: Method and apparatus is set forth for extruding honeycomb structures having cohesive cellular walls from an extrusion die. Deflector means are provided within flow passageways of the die, wherein the deflector means has a secondary feed system such that the batch flow from the main feed system is broken up into a multi-channel stream system which improves the flow of the batch material into the discharge slots, thus improving product quality and knitting or cohesiveness of the material prior to discharge from the die.

Abstract: Method and apparatus is set forth for extruding honeycomb structures having cohesive cellular walls from an extrusion die. A baffle member is provided within the flow passageways of the die so as to provide impedance to longitudinal batch flow through certain of the discharge slots such that the impedance to flow in all of the slots is substantially equal, thus improving product quality and knitting or cohesiveness of the batch material prior to discharge from the die.

Abstract: A nozzle ring of an extruder for blowing tubular plastics film is divided into cooling sectors provided with adjusting elements. The thicknesses of the blown film are measured over the circumference thereof and a number of film sectors of equal circumferential length corresponding to the number of cooling sectors is established from the measured thicknesses. Assuming that the film sector of maximum or minimum thickness has been extruded in the correct position for the purpose of determining the cooling sector associated with the film sector, the subsequent film sectors are in turn allocated to successive cooling sectors. From the measurements, the mean thickness distributions are determined over the individual film sectors. These values of mean thickness distribution define a measure for the correcting command for the adjusting elements of the cooling sectors that are associated with the respective film sectors.

Abstract: A ring nozzle for use with an extruder to continuously form a synthetic-resin tube has a substantially stationary back nozzle part having an axially forwardly directed front face and formed with an axially centered passage opening at the face. This part is typically bolted over the outlet of the extruder. An axially centered core rod is substantially fixed in the passage and extends axially forward past the front face. This rod is also fixed in the extruder so that same can emit a hot and thick tubular strand of a plastified synthetic resin. An annular and movable front nozzle part fits with spacing around the core forward of the front face and forms therewith an axially centered and forwardly open annular gap. The thick tubular strand formed by the extruder becomes a thin-walled strand that emerges from the annular gap.

Abstract: An extruder coating die for depositing protective cushions on the plastic jackets of hoses, tubes or the like. The extruder consists of a fixed part and of at least one movable part which can be adjusted between two end positions and combines the following features:(a) the movable part (8b) is rotatable with respect to the fixed part (8a);(b) the fixed and the movable part are provided with ray-shaped inwardly extending arms of which the inside ends extend as far as the hose or tube surface at the jacket material; and(c) the arms of the movable part (8b) are of widths such that in one of the end positions of the movable part they bare the free spaces between the arms of the fixed part and in the other position they cover them.

Abstract: This relates to a die assembly for extruding tubular casing films wherein there are counter-rotating die members. One of the die members is mounted for shifting relative to its base under the influence of hydrodynamic pressures of the flowing extrudate so as to be self-centering relative to the other die member. This provides for a high shear cylindrical area leading into the die orifice which is of uniform thickness and which will provide for uniform fiber orientation due to the zero runout of the rotating dies.

Abstract: In the production of a tubular extruded section of thermoplastic material, the actual length of an extruded section at the end of the extrusion operation may be smaller or greater than the length of the extruded section which passed through the discharge orifice of the extrusion head during extrusion. If the wall thickness of the extruded section is varied during extrusion in accordance with a given program, inaccuracies in regard to distribution of the wall thickness over the length of the extruded section can be reduced by detecting the length of the extruded section which passes through the discharge orifice, and controlling the means for producing the programmed variation in wall thickness, in dependence on that discharge length. The same effect can be achieved by controlling the means for producing the programmed variation in wall thickness, in dependence on discharge speed and time.

Abstract: An adjustable die mechanism (10) for extruding a profiled strip of plastic or elastomeric material wherein a plurality of adjacent segments (44) is located upstream and in spaced relation from a final extrusion die assembly (32), having a predetermined profiled opening (38), with this plurality of segments (44) being mounted for individual and independent adjustment thereof, each segment having one end (46) capable of extending into the extrudate flow channel (26). Means for actuating (64) move the segments (44) relative to the profiled opening (38) in a predetermined manner such that moving the segments (44) into the profiled opening (38) modifies the flow of the extrudate material downstream of the segments (44) as the profiled strip emerges from the die assembly (32). The die mechanism includes control means (82) for selectively operating the means for moving the segments so as to produce a strip of material having the desired characteristics.

Abstract: An apparatus (10) and method for fabricating tubes (26) from powders (32). A retractable, rotating mandrel (18) is disposed within a powder hopper (12) and circumscribed by a plurality of swaging dies (20). A flexible iris (14), disposed between the hopper (12) and the dies (20), reduces powder (32) loss.As the mandrel (18) is withdrawn from the hopper (12), the dies (20) alternatingly expand and contract compacting the powder (32) in a compaction zone (48) about the mandrel (18) to form a tube (26). The resultant continuous tube (26) is withdrawn along with the mandrel (18).

Abstract: An extrusion head with an annular extrusion die gap or orifice for fabricating a hollow extrudate of thermoplastic material. The extrusion head has a central die core and outer die casing ring cooperating to define the die gap. The inner boundary of the die gap is formed by a wall of the die core, while the outer boundary of the die gap is formed by a wall of the casing ring. At least one boundary wall of the die gap comprises independently movable sections that move with respect to the other boundary wall to change the width of the die gap.

Abstract: Tetrafluoroethylene polymer tubes are ram extruded. Desirable quality tubes are obtained by positioning an insert between ram and mandrel to maintain the ram and mandrel concentric.

Abstract: During the production of a preform of thermoplastic synthetic material by means of extrusion from an extruder head provided with a slot-shaped exit opening, the width of which is changed according to a specific program during the extrusion of the preform in order to change the wall thickness thereof, the wall thickness of at least one section of the preform should be controlled by at least one additional program, which is superposed on at least one portion of the first program, which is longer than the additional program. In this manner, one achieves greater flexibility in respect to fulfilling the requirements of each situation on the programming, namely both in respect to the resolution and in respect to precise determination of the location of the individual switch points, even when a very great number of changes of the slot width must be undertaken over a very short section of the preform or during a very short time period during the extrusion process.

Abstract: An annular exit die for an extrusion head of the type having a die casing ring and a tapered die core cooperating to form an annular die gap or orifice for fabricating a hollow extrudate of thermoplastic material. The tapered die core is adjustable in the axial direction and changes the radial cross-sectional dimension of the die gap as a function of its position. The casing ring has a lower end and an inner wall defining the outer boundary of the die gap. The wall has a step at the lower end of the ring. The step has an inner radially undulating circumferential profile and a radially undulating edge defining the boundary between the step and the lower end of the casing ring. The inner wall of the ring also has another step disposed radially inwardly of the first-mentioned step. This step has an inner radially symmetrical profile and a radially symmetrical edge defining the boundary between the two steps.

Abstract: An extrusion head for use in blow molding machines for molding parison having a single layer or wall or a plurality of layers or walls, in which a plunger is slidably interposed between a head body and a core and the plastic material is successively accumulated in an accumulation chamber defined between the extruding end of the plunger, the head body and the core so that the faster the plastic material is introduced into the extrusion head, the faster it is extruded.

Abstract: A high-strength laminate comprising generally weakly adhered biaxially oriented films, each formed of a blend which exhibits a distinct fibrous morphology with the fibres forming a distinct unidirectional grain when measured on a macro-scale but with the fibre-portions strongly deflected from this direction as seen on a micro-scale, the films being arranged in the laminate such that the unidirectional grain in at least two of the films criss-cross each other. This laminate is produced by melt attenuating the blend(s) while extruding the latter to films, cross-laminating the layers before or after solidification while they are still in molecularly unoriented state--except for the weak orientation produced by the melt-attenuation--and finally strongly biaxially orienting the laminate by stretching in several steps, whereby the stretching is generally uniaxial during each step.

Abstract: An integrally extruded all plastic "pile" weatherstrip comprises an elongated longitudinal substrate from which vertically project a plurality of integral, spaced parallel, thin, flexible, deformable, wavy S-configured fin members. The exposed upper ends of all or any desired lesser number of the fin elements may be partially slit to from 20% to 100% of the fin height to control the amount of air and water moisture infiltration through the weatherstrip. The fin element ends are slit at a desired bias angle with respect to a horizontal line lying within a horizontal plane surface in which the fin ends are located. The extrudable plastic is preferably high density polyethylene, polypropylene or polyvinyl chloride and may optionally contain an ultra-violet absorbent composition and a partially compatible lubricant.

Abstract: An insert is sized for close-fitting reception into either a distribution channel or a standardized receptacle formed in an extrusion coating die to define a distribution channel dedicated to a particular coating fluid.

Abstract: A coextrusion die for the extrusion of plastics materials in the shape of a tubular film comprising supply means for separately supplying at least two plastics materials to said die, a distribution channel system connected to each supply means, each distribution channel system comprising at least two arched channels provided in different axial planes, the ends of each arched channel being connected to the middle portion of the following arched channel and the distribution channel systems being located at different distances from the center axis of the die, collecting chambers communicating with said distribution channel systems and an annular extrusion slot communicating with the collecting chambers.

Abstract: Extrusion apparatus including rotary shell having plural circumferential rows of extrusion orifices and a stationary inner member, defining with said shell, circumferential channels communicating with said orifices.

Abstract: Turbulence members made of a synthetic resin are manufactured by a method which comprises melting a synthetic resin and causing the molten resin to be rotated around its axis and at the same time extruded in a state wherein the molten resin is spirally twisted by use of an extruding means provided with a rotary nozzle having a slit, passing the extruded molten resin under water in a cooling means thereby cooling and solidifying the extruded resin and drawing the resultant resin with a drawing means. The cooling means is provided with a relatively narrow and relatively wide chamber to facilitate uniformity and efficiency of production.

Abstract: A plastic resin blow molding machine to form bottles from a thermoplastic resin forms a tubular parison of plastic resin by extruding the molded plastic from the circular orifice formed between a vertically aligned mandrel and a forming die. The mandrel is vertically adjusted relative to the forming die by an adjustment nut having screw threads which mate with the screw threads of the mandrel. The adjustment nut is rotatably mounted on a plate and is fixed to a ratchet ring having evenly spaced indentations, the ratchet ring being turnable by a ratchet wrench having a spring-loaded pawl.

Abstract: A mold has a core surrounded by an outer sleeve which defines with the core an annular axially extending passage. An adjustment element in the form of a ring or sleeve is displaceable in this passage so as to vary the radial dimension of a tubular blank that is extruded from the outlet end of the passage. The adjustment ring or sleeve may be elastically deformable by means of hydraulic cylinders or screws so as to create the desired thickness at the desired location, and may even be displaced during operation of the apparatus so as to vary the thickness of the blank from one region to another in the direction in which it is extruded.

Abstract: For producing a hydrolized food product a stream of product is conveyed to a nozzle head (4) by means of a worm (1) and discharged via nozzles (8). Processed pieces of product are cut off from the stream of product one after another. The interrupter serving for this purpose displays a rotating element (5) that is arranged rigidly on the nozzle head side end of the worm (1) and rotates together with this latter. The rotating element (5) has recesses (10) that intermittently feed the stream of stock to the nozzle inlets (9) and sealing faces (12) that are arranged between the recesses (10) and seal the nozzle inlets (9) against the stream of stock between the feed phases. The edges (14) of the sealing faces (12), leading in the direction of rotation (13), guarantee the intermittent interruption of the stream of stock effecting cut-off of the pieces of product one after another.

Abstract: The present disclosure is directed to a centering device for shaping tools for extrusion presses, wherein an outer mandrel together with an inner mandrel define a through gap for plastic extrusion material which device has a plurality of centering members supported on the outer mandrel which are distributed over the periphery of a radial plane and which are adjustable in the radial direction and which are constructed in the form of push rods guided for radial displacement. Each push rod (6,106) has associated therewith an individually adjustable drive, an adjustable lever (7,107) supported for pivoting on the outer mandrel and which are actuable by means of a tightening device (8,108) and form a transmission gear for applying the tightening force.

Abstract: An apparatus for introducing a candy filling forced out of a conveyor into a rod-forming machine in which the candy composition receives its final shape. A filling tube extends into an interspace between conical rolls of the rod-forming machine and a rigid connecting pipe is hingedly inserted between the conveyor and the filling tube by way of movable pipe fittings.

Abstract: An apparatus for producing a continuous rod having a capillary or capillaries, adapted for the writing nib of a writing instrument. The apparatus is comprised of a tubular body and a core arranged in the body. The core is provided with a plurality of radial slits. The apparatus is further provided with a restricted portion facing an outer periphery of the core for controlling the amount of melted material passed through the nozzle.

Abstract: Disclosed is a method and apparatus for forming multi-directionally oriented plastic articles by accumulating a body of plasticized thermoplastic material in an amount at least sufficient to form the desired article, and advancing the material under pressure from said body forward and through an orifice. The material is non-linearly sheared while being advanced from the body toward the orifice and prior to its issuance from the orifice to induce orientation stresses into the material, and during shearing the material is at a temperature which is conducive to orientation. The orientation stresses are frozen into the material when the material is formed to a desired configuration exteriorly of the orifice by known plastic forming techniques, such as extrusion, blow molding, injection molding, compression molding, thermoforming and the like. During such forming, additional orientation stresses may be induced in the material and superimposed upon those stresses previously introduced thereinto.

Abstract: An extruder has a nozzle from which it extrudes a strand formed of a mixture of wood chips and a synthetic-resin binder into a passage formed by a plurality of transversely and longitudinally movable walls. Opposite walls are urged transversely inwardly by respective hydraulic cylinders to compact and densify the strand as it cures, and other cylinders urge the walls upstream toward the nozzle with a force slightly smaller than the extrusion force. Thus as the extrusion force exceeds the opposite longitudinal biasing force the walls will move downstream with the strand, to return upstream between advance steps of the strand.

Abstract: A method of and apparatus for the cold extrusion of a mixture of plant particles and a binder, especially for the production of load-bearing beams and similar shaped bodies in which the plant particles are wood chips or the like, utilizes a plunger, ram or piston for displacement of the mixture into the extrusion passages (in which hardening can occur) under conditions such that the material flows during compaction and is compressed with a densification ratio of 2:1 to 4:1 (preferably 3:1), a plunger stroke of 400 to 800 mm (preferably 600 mm) and a velocity of the plunger between 0.04 and 1.5 meters per second (preferably 0.06 meters per second).

Abstract: A nozzle ring of an extruder for blowing tubular plastics film is divided into cooling sectors provided with adjusting elements. The thicknesses of the blown film are measured over the circumference thereof and a number of film sectors of equal circumferential length corresponding to the number of cooling sectors is established from the measured thicknesses. Assuming that the film sector of maximum or minimum thickness has been extruded in the correct position for the purpose of determining the cooling sector associated with the film sector, the subsequent film sectors are in turn allocated to successive cooling sectors. From the measurements, the mean thickness distributions are determined over the individual film sectors. These values of mean thickness distribution define a measure for the correcting command for the adjusting elements of the cooling sectors that are associated with the respective film sectors.

Abstract: A nozzle ring of an extruder for blowing tubular plastics film is divided into correcting sectors provided with adjusting elements. The thicknesses of the blown film are measured over the circumference thereof and a number of film sectors of equal cross-sectional area corresponding to the number of correcting sectors is established from the measured thicknesses. Assuming that the film sector of maximum or minimum thickness has been extruded in the correct position for the purpose of determining the correcting sector associated with the film sector, the subsequent film sectors of equal cross-sectional area are in turn allocated to successive correcting sectors. The throughput and cross-sectional area or temperature of the respective correcting sector is adjusted until the circumferential lengths of the film sectors are equal.

Abstract: Process for the production of alveolar modules comprising rows of parallel channels, certain of which issue onto the sidewalls of the module, the process consisting of producing the module by extrusion using at least two independent systems each producing rows of identical channels, whereby the formation of one of the systems is interrupted when the row of channels being produced is to issue onto the sidewalls of the module.The apparatus for performing this process comprises a first extrusion system incorporating first extrusion material supply means and a first spinneret complementary to the cross-section of the rows of channels issuing onto the sidewalls of the module and a second extrusion system incorporating second extrusion material supply means and a second spinneret complementary to the cross-section of the other rows of channels, the first and second supply means being controlled independently of one another.

Abstract: An extrusion die block providing a useful means of obtaining a polymer sheet with a highly efficient degree of gauge control comprises an extrusion passage defined by opposed surfaces and terminating in an extrusion orifice, at least one of said surfaces being provided with heating means comprising a plurality of elongated heater elements located within the die block at a distance of not more than 10 mm from the surface to be heated thereby, said elements being oriented in parallel with the major axis of each in the direction of extrusion.

Abstract: An extruder head for extruding an elastomeric composition to form a reinforced elastomer article such as a conveyor belt has a substantially rectangular die opening and a guide member disposed in the opening of the die for directing the reinforcing elements into the composition as it is shaped by the die.A device is provided for restricting the streams of composition, which flow on opposite sides of the guide member, to have said flow meet said reinforcement along two parallel fronts.

Abstract: An extrusion die for forming a multi-passage, elongated tubular member having transverse passageways formed between adjacent longitudinally extending passageways during the extrusion of the tubular member.

Abstract: Disclosed is an apparatus and method for extruding primary insulation and insulation shielding onto an advancing shielded conductor strand in one operation without causing inward protrusions of insulation shielding compound particles into the primary insulation comprising an extruder head with a starter tip, an antiprotrusion tip and a die.

Abstract: The present invention relates to a process for extruding a thermoplastic sheath in the form of a tubular film provided with perforations and to a device for carrying out the process, according to which the extruded film passes over a skirt through which are blown jets of hot air provoking the perforation and formation of openings in the film; in the areas where the film is not to be perforated, air jets are also blown through channels of smaller width, therefore with a reduced pressure, so that the jets do not provoke the perforation of the film but form an air-cushion facilitating the flow of the film on the skirt; the channels are supplied from a pneumatic chamber with interposition of a rotary distributor formed by a ring made of graphite or self-lubricating material. The invention is applicable to the manufacture of partially perforated tubular films with a view to making packings.

Abstract: An adjustment mechanism for a restrictor bar in a die construction of the type in which such restrictor bar is movable into and out of the internal flow path of the die so as to regulate extrusion of material therefrom. The restrictor bar movement is in axial direction and is accomplished by means of axially restrained, rotatable spools connected to threaded ends of studs in turn extending through the die body and fixedly attached to the restrictor bar. Each of the spools includes a breakable segment to cause the spools to break prior to possible stud overstressing. The spools or portions thereof may be easily replaced at a position located outside of the die and accordingly eliminates die down time.

Abstract: An accumulator head is described as having an annular accumulation chamber, an annular ring-piston movable axially through the chamber, an inlet through which plasticized resinous material is forced into the chamber between opposing ends thereof, and a special feature built into the ring-piston which causes material, flowing into the chamber, to wipe the face or tip of the piston and keep it clean and free of any material. A discharge passageway leads from the accumulation chamber to a discharge orifice adjacent which a parison is formed by resinous material from the chamber. Another inlet is provided in the discharge passageways as a means of providing a final, outer layer or laminate of material to that flowing out the discharge passageway from the chamber.

Abstract: Disclosed is an improved extrusion apparatus which prevents the distortion of peripheral cells in extruded honeycomb structures. The apparatus includes a die having an outward surface which is beveled to have a primary face and a surrounding face converging in the extrusion direction. An extrusion mask is provided having a central orifice and an entrance face also converging at the same angle in the extrusion direction. The use of an extrusion mask having an entrance face converging at the same angle as the beveled surface of the die body has been found to reduce peripheral cell crushing. Moreover, also disclosed are spacers situated between the die body and the mask which control the thickness of the gap between the die body and mask thus allowing for the provision of extruded honeycomb structures having skins of varying thickness.

Abstract: A die for the extrusion of a tube of plastic polymer consists of at least two coaxially mounted die parts forming one or more annular die gaps between them from which the tube is extruded. The die parts have two respective axial cylindrical surfaces. There is provided between these surfaces an annular member of material of higher coefficient of expansion than the material from which the die parts are made. As the die becomes heated this annular member also becomes heated and its additional expansion causes its outside diameter to expand and its inside diameter to contract into forcible engagement with the surfaces thereby stabilizing the radial gap between the die lips.