Abstract: A heated die (10) is divided into four segments slidable with respect to adjacent segments so that when opposing segments (12) and (16) move together and forward, segments (14) and (18) are moving out and back. Thus, friable material may be formed and drawn through die (10) by the action of the die.

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: Novel rotary processors and methods which provide extremely efficient devolatilization of particulate materials which contain substantial amounts of volatiles and in which the boiling point of the volatiles presents separation problems. The processors and methods involve a rotatable element carrying a plurality of annular channels and a stationary element providing a coaxial closure surface operationally arranged with the channels to provide enclosed processing passages. Each passage includes inlet means, outlet means and a channel blocking member all associated with the stationary element and arranged and adapted so that material fed to the inlet can be carried forward by the rotatable channel walls to the blocking member for discharge from the passage. The passages are interconnected by material transfer grooves formed in the closure surface and are arranged to provide at least a melting stage and a devolatilizing stage which operationally communicates with a vacuum source.

Abstract: The present invention relates to a nozzle head for a cooking extruder for the production of a porous edible shell which is filled with an edible filling. The shell is of a breadlike character and the filling may be a sweet filling or an acid fat-containing filling.The axis of the extruder nozzle is perpendicular to the axis of the extruder worm, and a filling tube through which a filling mass can be fed to the shell extends through the extruder nozzle.In accordance with the invention, the filling tube 9 is surrounded by a mandrel 2 which forms with the tube an annular space 7 which separates said tube from the space conducting the molten material and extends to the outlet opening 6 of the extruder nozzle 3.In this way the filling tube and the melt are thermally separated from each other so that the filling tube is not heated while, on the other hand, the melt is not cooled at the outlet end.

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 a process and apparatus for extrusion of multiple-layer sheeting comprising an improved co-extrusion feedblock and valve plate for laying down co-extruded resin streams onto a main extruded polymeric resin. The new design provides advantageous external control of the layer number as well as a more refined control of layer thicknesses.

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: 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. 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: 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: 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: An extrusion nozzle arrangement for the production of a product such as a comestible, including a multiple nozzle arrangement through which there can be fabricated a multi-layered slab of a meat analogue product. A bacon-like appearance is achieved in that each extrusion nozzle includes a narrow, elongate bottom outlet orifice arranged to extend transversely above a continually moving horizontal conveyor belt. An insert strip is arranged within the nozzle above the orifice and coextensive with the length thereof, which includes projections extending across the path of flow of the solution extruded through the orifice, with such projections being positioned in a predetermined manner along the insert strip as to cause either restrictions or directional changes in the flow of the solution egressing from the nozzle orifice.

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: A foam extrusion die and monitoring apparatus, including a pair of adjustable die lip members having opposed, rigid die lips defining therebetween an elongated arcuate die orifice, is characterized by position sensors located along the arc of the die lips to monitor the die opening at such locations. The position sensors include sensing styli mounted for movement with the lip members at respective sensing locations such as at the arc ends and arc centers of the die lips, and provision is made for connecting the sensing styli as by precision push-pull, flexible cables to respective linear variable displacement transformers which provide electrical output signals representative of sensed positions to remotely located monitoring circuitry. The apparatus has particular application in a vacuum extrusion line wherein the extrusion die is located inside a vacuum chamber and thus is inaccessible during extrusion.

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 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: 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: 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: Novel and improved processes and apparatus for processing particulate materials which can be converted to the liquid state. Essentially, the process and apparatus involve feeding a particulate material to an annular processing passage for melting and controlled processing. The annular processing passage is provided by a rotatable element carrying at least one processing channel, and a stationary element which provides a complementary, coaxial surface arranged with the channel to provide the enclosed processing passage. Also associated with the stationary element are an inlet for feeding material to the passage, an outlet for discharging material, a material collecting end wall surface for the passage and a member or members extending into the processing channel providing a material restraining surface between the inlet and outlet and occupying a predetermined portion of the melt pool space between the end wall and the restraining surface.

Abstract: The material flow within an extrusion die body is adjusted by a metering device to alter the product perforation pattern of an extrusion product produced in the extrusion die without changes of or modifications to any of the various other parts of the extruder system being required. The extruder system is an apparatus which includes, in addition to a hydraulic cylinder powered press, a basic extrusion die, a die body, a set of perforation forming die pins and a ported cover or pin support plate.

Abstract: Novel and improved methods and apparatus for processing liquid or viscous materials. Essentially, the methods and apparatus involve feeding liquid materials to an annular processing passage for controlled processing. The annular processing passage is provided by two elements. One is a rotatable element carrying at least one processing channel. The other element is stationary and provides a complementary coaxial surface arranged with the channel to provide the enclosed processing passage. Also associated with the stationary element are an inlet for feeding material to the passage, an outlet for discharging material from the passage, an element near the outlet providing a material collecting end wall surface and an element positioned between the inlet and outlet providing a liquid material spreading surface.

Abstract: A novel, improved rotary processor comprising a rotatable element carrying a plurality of processing channels and a stationary element having a coaxial closure surface operationally arranged with the channels to provide a plurality of enclosed processing passages. The plurality of passages provide interconnected processing stages including a first processing stage and a second processing stage having inboard and outboard sections separated by a third processing stage.

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 die assembly for the extrusion of thermoplastic pipe from a plastic exhibiting an appreciable amount of memory and thus having an elongated heated portion defined by an elongated outer bushing ring with an inside diameter substantially equal to the nominal outside diameter of the pipe to be produced and an inner mandrel ring having an outside diameter smaller than the inside diameter of the bushing ring and disposed within the bushing ring to form an annular extrusion channel, the essentially straight portion of the extrusion channel defining the land length of the die and the width of the extrusion channel defining the die opening of the die, the improvement comprising a mandrel formed in two sections, including a longer upstream section, fixedly mounted in the die and having a fixed mandrel outside diameter and a downstream mandrel section removably mounted in the die as an extension of the upstream section and replaceable by downstream mandrel sections of equal length but different mandrel outside diamet

Abstract: The coextrusion die assembly receives a first and a second plasticized material flow which it forms into a layered, cylindrically tubular flow. An inlet block (100) receives the first material flow axially and the second material flow radially. A manifold block (200) forms the first material flow into a cylindrical flow and divides the second material flow into eight equal flow portions. A spider structure (300) has a first plurality of apertures (302-308) which pass the first material flow and eight second apertures (330-344) which receive the eight second material flow portions from the manifold. Each of the eight second spider apertures has a relatively small upstream opening and fans peripherally outward into a continuous cylindrical downstream region. A non-linear restriction means (440-454) provides a greater restriction in longitudinal alignment with the center of each of the second apertures and a less restrictive region therebetween.

Abstract: A depositing apparatus for the manufacture of shaped food product includes a hopper having an open top for receiving a prepared mix. Feed rollers positioned within the lower end of the hopper force mix through an extrusion die assembly. The die assembly includes an elongated plate defining a plurality of apertures and supporting a plurality of dies in coaxial relationship with the apertures. A variable restrictor is supported at each of the apertures for varying the effective open area or flow area of the apertures. The flow area may be varied to compensate for variations in weight, consistency or volume of the mix so that relatively uniform weight shapes are deposited onto a conveyor passing underneath the feed hopper. The variable restrictor includes a pair of opposed plates having edges configured in a complementary fashion to the cross-sectional shape of the die. A drive is operably connected to each of the plates so that they may be moved towards and away from each other into the aperture.

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 kitchen appliance for and method of making farinaceous products such as spaghetti, fettucini, macaroni, manicotti, lasagna, pizza crusts, taco shells, bagels, breadsticks and like dough products, use a mixing chamber for receiving the product ingredients, a rotary mixer for mixing the ingredients, a rotary extruder for extruding the mixed ingredients through an extrusion die at a discharge outlet, and a reversible motor drive for jointly turning the rotary mixer and rotary extruder about the same axis of rotation in either circumferential direction. In one direction, only mixing is effected; in the opposite direction, extruding is effected. An arrangement for and method of adjusting the thickness of the extruded farinaceous product are also described.

Abstract: An extruder nozzle for producing a relatively wide flat ribbon of extruded fluid is provided. The extruder nozzle includes a groove in communication with the orifice of the nozzle, the groove being generally arcuate in shape and so dimensioned that the ends of the arc are closer to the extrusion point than is the center so as to cause the orifice to fill completely and thereby permit the extrusion of a relatively wide flat ribbon. A shim means is provided to establish the size of the orifice and to cut off the arcuate groove at each of its ends to establish a reservoir of fluid at each end of the groove and thereby eliminate the formation of a needle or the like at the lateral edges of the extruded ribbon. Shim means of various thicknesses may be utilized to control the thickness (or depth) of the extruded ribbon.

Abstract: Novel, improved rotary processors which include a rotatable element carrying a plurality of annular channels and a stationary element providing a coaxial, closure surface operationally arranged with the channels to provide enclosed processing passages. The so-formed plurality of processing passages provide a highly efficient processing stage particularly for melting polymer material. Each processing passage of the processing stage includes inlet means, outlet means and a channel member associated with the stationary element and arranged and adapted so that material fed to the inlet can be carried forward by the rotatable channel walls to the blocking member for discharge from the passage.In rotary processors of this invention the clearance between the rotary surface carrying the channels and the stationary coaxial closure surface is relatively wide and permits substantial amounts of material to be interchanged between passages of the processing stage.

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: Apparatus for the expansion of oil bearing seeds and of the kind comprising at least one screw (11) rotatable in a barrel (10) for conveying seed through the barrel from one end to the other, there being a die plate (14) having orifices (15) therein at the output end of the barrel and through which the seed material is extruded by the action of the screw or screws, there being a plurality of throttle needles (17) having portions (19) of tapering cross-section and movable linearly with respect to said orifices thus to vary the effective cross-sectional area thereof in response to conditions within the barrel such as temperature as detected by a temperature sensor (22), the cylindrical wall of the barrel being either wholly plain or in part comprised by a plurality of circumferentially spaced axially extending bars forming a press cage, the position of the throttle needles ensuring control of the state of the seed material prior to extrusion through the die plate.

Abstract: What is disclosed is an adjustable wide-slit extrusion nozzle containing a distributor channel having a straight exit edge and a cross-section taken from the supply port for the nozzle to one end thereof which corresponds to the equation:R.sub.i =R.sub.o (b/B).sup.1/3,wherein:B is the width of the distributor channel from the supply port to one end of the channel;b is a width coordinate measured from one end of the distributor channel;R.sub.o is the hydraulic radius of the distributor channel at the supply port; andR.sub.i is the hydraulic radius of the distributor channel at the distance b from the channel end.At least one choker bar insert is placed between the distributor channel and the nozzle mouth; the choker bar has a damming area surface whose length dimensions L.sub.i in the direction of flow at distances b from the channel end correspond to the equationL.sub.i =L.sub.o (b/B ).sup.2/3,whereinL.sub.o is the length of the damming strip at the supply port;L.sub.

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: Apparatus for extrusion of a plastics pipe, comprising a plurality of different layers is disclosed, including an extrusion die having a base-plate with a mandrel extending therefrom, a stack of five annular die plates secured to the base plate and defining with the mandrel an annular extrusion passage leading to an annular extrusion outlet. Three annular plenum chambers defined respectively between the mandrel and the rearwardmost plate and between adjoining said plates lead into the annular extrusion passage upstream of the extrusion opening. Equalization rings and a front die member are adjustable diametrally with respect to the mandrel to adjust the concentricity of the different layers in the pipe produced.

Abstract: A foam extrusion die assembly includes a die body and a pair of spaced cantilevered lip members having opposed lips defining an elongated, arcuate die orifice through which extrudate moves both laterally and axially outwardly relative to the lip members. Each lip member further has an axially extending flexible leg and a foot at the end of the leg opposite the lip. Each foot is adjustably and sealingly clamped to the die body by a retainer bar whereas each leg is free to flex to pivot the lips with respect to each other. Adjustment screws journaled in the die body vary the spacing between the feet of the lip members and pivot the lips about the flexible legs to produce a desired die orifice size and shape.

Abstract: Elimination of shearing flow, having an inwardly radial flow and velocity gradient, of extrudable material entering a die for forming a honeycomb structure with a plurality of thin-walled cells, thereby avoiding irregularities in the extruded structure. The shearing flow, resulting from reducing cross-sectional area of a Bingham plastic material (e.g. a cordierite-forming, plastically moldable ceramic batch material) passing through a funnel section tapering inwardly from an extrusion barrel, is changed to plug flow by maintaining constant the reduced cross-sectional area through a straight-walled portion of an entrance cavity feeding the material to the die, which has passageways including a plurality of feed holes communicating with interconnected discharge slots sequentially in the extrusion detection for forming the honeycomb structure.

Abstract: An extrusion device comprises a die provided with feed passageways and grid-shaped extrusion slots of which width is made larger in the outer peripheral portion compared with those of the central portion of the die. By the above extrusion device, a honeycomb structure having a thicker walled outer peripheral portion can be obtained without any distortion.

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: 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 composite extrusion die wherein large extrusion passageways are provided opening to the compression side of the die. Disposed within the extrusion passages towards the discharge side of the die are inserts having a plurality of smaller die passages. The construction provides for effective use of materials for both strength and wear resistance, provides a generous precompaction chamber and allows the concentration of heat buildup to occur locally in the die passage. The construction permits the use of readily formed ceramic or sintered metal inserts which may be mass produced and are readily interchangeable within the die matrix.

Abstract: The present invention concerns an integrated die extrusion vessel with controlled circular distribution of the extruded material. In particular its object is an extrusion vessel or head which can be fitted by its base to the exit of an extruder and which comprises at its top a die including radial distributing means equidistant from each other on the same circumference and designed to calibrate and control the flow rate of the strands of extruded material coming from the extruder and passing through crown arranged orifices and passing through the base plate of the vessel, and further designed to balance match these material strands to the geometry of the shaped section before they enter the die.

Abstract: Blow-moulding apparatus for the manufacture of hollow bodies from a thermoplastic in which a screw extruder extrudes the thermoplastic into an accumulating chamber, and a piston forces the thermoplastic through a gap-like outlet orifice of the accumulator chamber to form a parison. A blow-mould consisting of at least two parts which can be opened is positioned so that the blow-mould encompasses the parison. Control means are provided for adjusting the width of the gap-like outlet orifice of the accummulator chamber as a function of the length of the parison extruded, which length can be detected e.g. by a light beam and a photo-cell.

Abstract: Disclosed is a novel extrusion die mask for use in the extrusion of honeycomb structures. The mask includes a stationary portion with an orifice extending longitudinally therethrough. A movable recess means is provided which forms a recess communicating between the outlet face of an extrusion die and the central orifice which receives and compacts extruded batch material from the die to form the skin of the extruded honeycomb structure. An adjustment means is provided for controlling the depth of the recess whereby the amount of material directed to the skin of the structure may be varied as batch viscosity varies and as product requirements indicate.

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.