Abstract: There is provided a mold for extrusion forming of ceramic articles which is excellent in wear resistance and can remarkably decrease forming defects in the vicinity of outer peripheries thereof. The mold for the extrusion forming of the ceramic articles includes a die 1 having a plurality of back holes 9, and slits 8; a back pressing plate 12 and a back spacer 13 to adjust the amount of the kneaded clay to be supplied; and a pressing plate 11 and a spacer 10 to regulate the shape and size of the formed ceramic article. At least a portion of the supply end 22 of the die 1 which overlaps with the back pressing plate 12 is flattened, and a surface roughness (Ra) thereof is in a range of 0.05 ?m to 10 ?m.

Abstract: A blown film extrusion device includes a blow head and an outer cooling ring mountable on a top of the blow head. The cooling ring has an annular support surface on its bottom and can be centered relative to the blow head via centering devices. The centering devices are formed by at least three radially arranged linear guides, each of which has a radially extending recess and at least one guide element engaging in the recess.

Abstract: A joined article in which a first metal member made of a tungsten carbide base cemented carbide and a second metal member made of a martensitic stainless steel having a carbon equivalent of 2.5 to 3.5 and containing 0.030 mass % or less of sulfur are joined. The martensitic stainless steel having the carbon equivalent of 2.5 to 3.5 is preferably at least one selected from the group consisting of SUS431, SUS420J1, SUS420J2, SUS410, SUS410J1, S-STAR, PROVA-400, HPM38, STAVAX ESR, and SUS403 in the joined article. There is disclosed a joined article in which the lowering of the strength of a second metal member around a joining interface thereof is prevented.

Abstract: A honeycomb extrusion apparatus comprises a die body and a flow control device. The die body comprises an inlet end, an outlet end, a central axis, a first set of feedholes, a second set of feedholes, a set of central slots, and a set of outermost peripheral slots. The first set of feedholes extends from the inlet end to an interior interface portion of the die body. The second set of feedholes extends through the die body from the inlet end to the outlet end. The set of central slots extends from the outlet end to the interior interface portion of the die body. The set of outermost peripheral slots is disposed radially outwardly of the central slots. The interior interface portion of the die body is configured to allow flow of the batch material from the first set of feedholes to the central slots and to the outermost peripheral slots.

Abstract: A spider for an extrusion apparatus located upstream from a die, through which a profile is extruded. The spider can have an outer housing with a central flow passage therethrough. An inner hub can be positioned within the central passage for supporting an inner portion of the die. At least one spider leg can be secured to the outer housing and the inner hub, and support the inner hub within the central passage. The at least one spider leg can recess radially rearwardly outwardly in the downstream direction such that molten polymer flowing through the central passage flows around the at least one spider leg, separating and rejoining together earlier in inner radial regions close to the inner hub than in outer radial regions close to the outer housing for reducing spider lines on inside surfaces of extruded profiles.

Abstract: A die comprising two die cavities, with each capable of supplying polymeric material, and a distribution plate interposed between at least a portion of each of the two die cavities. The distribution plate has a dispensing edge and a plurality of extrusion channels. First and second extrusion channels extend from entrance openings at the first and second die cavities, respectively, to exit openings on the dispensing edge. The exit openings of the first and second extrusion channels are disposed in alternating positions along the dispensing edge. A method of extruding with such a die and an extruded article made therefrom are also disclosed. The method includes co-extruding a first polymeric composition and a second polymeric composition. The extruded article comprises a plurality of longitudinal first stripes of the first polymeric composition alternating with a plurality of longitudinal second stripes of the second polymeric composition.

Abstract: Disclosed is an evacuation system for use with plastic extrusion dies, in particular a contaminant evacuation system for removal of air borne contaminants generated at the die orifice of a plastics extrusion apparatus. The system includes an annular evacuation chamber and a suction source connected to the evacuation chamber for generating a vacuum in the evacuation chamber. The evacuation chamber has a radially inwardly directed annular air intake opening for placement about the die orifice, and a baffle structure in the evacuation chamber for equalizing suction pressure along the air intake opening and reduce or avoid localized pressure differences around the extruded product, which would lead to deformation of the product.

Abstract: A die comprising molding grooves arranged in a lattice pattern and moldable-material-supplying holes communicating with the molding grooves for molding a ceramic honeycomb structure, the molding grooves having width of 0.05-0.5 mm, the moldable-material-supplying holes being arranged in every intersecting portions of the molding grooves, or in every other intersecting portions of the molding grooves in a checkerboard pattern, and an average distance between the centers of the intersecting portions of the molding grooves, at which the moldable-material-supplying holes are arranged, and the center axes of the moldable-material-supplying holes being 10-100 ?m.

Abstract: Method and apparatus for casting a concrete product with a substantially horizontal slipform casting process, wherein the concrete mix is fed at least in one step through a limited cross-section moving progressively along with the cast, whereby the height of the product forming part (1) is changed during the cast. The invention also comprises a product forming part (1) having an adjustable height.

Abstract: A honeycomb structure-forming die 1 has a die substrate 22 including a first plate-shaped member 23 having back holes 6 for introducing a raw forming material and a second plate-shaped member 24 having slits 5 for forming the material into a lattice shape. The first plate-shaped member 23 has columnar portions 8 where at least a part is zoned by a slit-shaped groove portion 7 corresponding with a shape of the slit 5 on a bonding face side 28 where the first plate-shaped member 23 is bonded with the second plate-shaped member 24. In the columnar portions 8, the ratio (L/T) of the height L of the columnar portions 8 to the minimum width T in an end face on the bonding face side 28 is within 1/3 to 3.5. Thus constituted die realizes high formability, and two plate-shaped members constituting the die substrate are hardly peeled from each other.

Abstract: In certain aspects of the invention, an extrusion apparatus for making a multilayer article includes multiple discs, each of which has at least one passageway configured to permit fluid flow therethrough in a flow direction. At least one of the discs includes a cone shaped portion extending substantially parallel to the flow direction.

Abstract: A die for extrusion-forming a honeycomb structure which includes: a die base provided with ceramic puddle introducing holes and slits in communication with the ceramic puddle introducing holes; and a substrate layer, which roughly defines the final width of the slits, and a surface layer, which precisely defines the final width of the slits, formed on the die base in this order so that the final width of the slits becomes 15 to 200 ?m, wherein the surface layer is made up of tungsten carbide particles which are 5 ?m or less in average particle diameter and contain W3C as a main ingredient. According to this invention, there is provided a die for extrusion-forming a honeycomb structure which can restrain fluctuation in extrusion-forming speed among its parts and resistance to pushing force, both caused at the time of extrusion-forming, to be very small and is superior in productivity and durability.

Abstract: A blown film extrusion line has an annular die gap, from which a film tube can be extruded, a flatness unit or nip rolls, which fold the film tube, a calibration basket, which is disposed between the die gap and the flatness unit or nip rolls, and which has at least two film-guide elements that guide the film tube such that the film tube retains its round cross-section, with the diameter of the film tube being adjustable by changing the relative position of the two film-guide elements. The calibration basket includes a coupling device that couples the movement of the two film-guide elements to each other.

Abstract: A head assembly (10) is provided for use in a rotary head extruder (12) for extruding a food product. The head assembly (10) includes an annular-shaped stator plate (20) and a rotating blade plate (22). The blade plate (22) preferably includes at least six blades, each with a wedge shaped profile, and the stator plate (20) includes extrusion channels that extend at an angle in the range of 20°-50° from tangent to a circle defined by an inner surface (30) of the plate (20).

Abstract: A manufacturing system for producing polyolefin includes a polymerization reactor, a flash chamber, and a purge column. In certain embodiments, the purge column may receive a solids stream directly from the flash chamber. Further, the purge column may function as a feed tank for an extruder within an extrusion/loadout system. According to certain embodiments, the manufacturing system may be configured to consume less than 445 kilowatt-hours of energy per metric ton of polyolefin produced based on consumption of electricity, steam, and fuel gas.

Abstract: The invention relates to a method and a device for producing a grass yarn for artificial turf. A film is produced from a polymer material in an extrusion process and divided into individual strips. The strips are crimped before being coiled into spools. The aim of the invention is to achieve a structure which particularly matches natural grass. According to the invention, this is achieved in that the film or the strips are fibrillated by a needle roller before crimping and the strips are separated after on and individually crimped independently of each other.

Abstract: This invention provides a resin extrusion die capable of suppressing die drool generation and contamination of a resin molded form with generated die drool serving as foreign substances. The resin extrusion die includes a cap through which a molten resin is extruded, and a cover that includes a gas outlet for forming a gap around the tip of a discharge nozzle and covers at least part of the cap so as to form a space between the cap and the gas outlet. The gas outlet forms, around the tip of the discharge nozzle, the gap whose maximum width/minimum width ranges from 1.05 to 2.0, thereby changing a gas supplied into the cover and flowing out of the gap to a turbulent flow.

Abstract: A nozzle for dispensing molten thermoplastic material includes non-circular outlets spaced apart from one another in a predetermined pattern. The nozzle may be used to dispense patterns of adhesive that form closed geometric shapes, such as for use in making hermetic seals.

Abstract: Example embodiments relate to a continuous metal extruder that includes a rotatable member having an extrusion screw portion for transporting metal to be extruded in an axial direction of the rotatable member, a fixed part, a spring element for biasing the rotatable member and the fixed part in relation to each other, and a thrust bearing arranged between the rotatable member and the fixed part.

Abstract: The present invention provides a molding apparatus by which it is possible to make a frame located around a mold contact thermoplastic resin. In the molding apparatus of the present invention, the thermoplastic resin extruded from an extruding machine in a sheet form is adsorbed onto a cavity surface of the mold. As a result, the thermoplastic resin is shaped into a shape according to the cavity surface. The molding apparatus includes a frame that is positioned around the mold and is movable relative to the mold. In the frame, a suction part to suck the thermoplastic resin is provided.

Abstract: A honeycomb segment-forming die includes: an introducing portion provided on an introduction face side and having a plurality of back holes, and a forming portion provided on an formation face side and having slits communicating with the back holes. The forming portion has a polygonal outer peripheral shape and forms a prismatic honeycomb segment by passing kneaded clay for forming which is introduced from the back holes of the introducing portion through the slits of the forming portion, and a gap between slits formed in each of corner portions including a vertex of the polygonal forming portion is larger than a gap of slits formed in the central portion of the forming portion. This enables to form a honeycomb segment having high compressive strength.

Abstract: An extrusion die assembly includes a hollow extrusion head which has a head inner surface, a central passage inlet opening, a forming section having a die opening, and a receiving space that extends from the central passage inlet opening to the forming section. A flow-dividing core is disposed within the receiving space, and has a central passage connected to the central passage inlet opening and extending to the forming section, and a grooved outer surface that is disposed upstream of the forming section and that has at least one groove which cooperates with the head inner surface to define at least one accumulating passage. An annular passage is formed in the forming section and around the flow-dividing core and the central passage, is connected to the accumulating passage, and merges with the central passage in the die opening.

Abstract: A spider for an extrusion apparatus located upstream from a die, through which a profile is extruded. The spider can have an outer housing with a central flow passage therethrough. An inner hub can be positioned within the central passage for supporting an inner portion of the die. At least one spider leg can be secured to the outer housing and the inner hub, and support the inner hub within the central passage. The at least one spider leg can recess radially rearwardly outwardly in the downstream direction such that molten polymer flowing through the central passage flows around the at least one spider leg, separating and rejoining together earlier in inner radial regions close to the inner hub than in outer radial regions close to the outer housing for reducing spider lines on inside surfaces of extruded profiles.

Abstract: The present invention provides an apparatus for inflation extrusion molding of pressure-sensitive adhesive sheet, the apparatus including: one or a plurality of extruders; a die into which one or a plurality of resin materials including at least a resin material for forming a pressure-sensitive adhesive layer and extruded respectively from the extruders are respectively introduced and which extrudes from an ejection opening the resin materials into an inflated cylindrical shape having a predetermined diameter in accordance with an inflation method; and two stabilizers facing each other at a predetermined angle so as to upwardly approach each other, and defining a space therebetween through which the cylindrically-shaped resin materials extruded from the die are passed to be deformed into a pressure-sensitive adhesive sheet in a flattened elliptical shape having a predetermined width, in which the stabilizers each have a plurality of air floating portions each of which blows air toward the resin materials; and

Abstract: Spiral distributors for plastic melt are often used for manufacturing foils in blown film extrusion lines. They overlie several partial flows of melt on their way to the ring-shaped outlet nozzle. The spiral distributors are designed either as cylindrical or truncated cone-shaped axial spiral distributors or as plate-shaped radial spiral distributors. In an axial spiral distributor several spiral channels are disposed as a multiple screw. In the case of a radial spiral distributor, several spiral channels are disposed as multiple spirals. The invention proposes to provide the spiral channels with shortening sections in their backward area. As compared to a geometrical rule for a discontinuation of the spiral channels which is valid in a prior section of the spiral channels, this leads to a faster discontinuation of the spiral channels. The invention has observed that the design of the backward area of the spiral channels does not affect the good overlaying effect of the front part of the spiral channels.

Abstract: The invention relates to a method and a device for cooling an extruded thermoplastics pipe (1) by directing a gaseous cooling medium tangentially towards the inner surface of the thermoplastics pipe (1) along its whole periphery, whereby the interior of the thermoplastics pipe (1) is divided by means of a protecting pipe (8) into an outer ring-shaped flow channel (9) for the cooling medium along the inner surface of the thermoplastics pipe (1), and a central return channel (10) through which a part of the cooling medium is intended to be sucked back influenced by the flow of cooling medium in the outer ring-shaped flow channel (9), and to be redirected towards the inner surface of the thermoplastics pipe (1).

Abstract: A mold for extrusion molding a medical application tube and the extrusion molding method thereof in which the medical application tube having a complex profile can be molded by using a soft thermoplastic resin. The mold for extrusion molding the medical application tube made of the soft thermoplastic resin provided with flow paths sandwiching the axial portion therein comprises the mold body and the pin including the land portion. The cylindrical rear side mold space for passing the molding material between the inner peripheral surface of the recesses of the mold body and the outer peripheral surface of the pin, and the tip end side mold space including the cross section for forming the medical application tube between the inner peripheral surface of the recess and the land portion of the mold body.

Abstract: A plate-like shape die 1 for forming a honeycomb structure provided with an introduction portion 3 having plural back holes on one side face (an introduction side) thereof and a formation portion provided with silts 6 communicating with plural back holes 7 on other side face thereof; using for forming a honeycomb shape with passing raw materials being introduced from back holes 7 of an introduction portion 3 through silts 6 being provided on the forming portion 2, wherein the introduction portion 3 is composed of two layers of a plate-like abrasion portion 5 constituting an introduction face 8, and an introduction portion main body 4 located between the abrasion portion 5 and the forming portion 2, and the abrasion portion 5 is detachably disposed on the introduction portion main body 4.

Abstract: An injection head (10) is described for a corrugator which is intended for the production of plastics pipes. The injection head (10) has a main head (12), a nozzle body (14) and a mouthpiece means (16) with at least one mouthpiece (32, 36). The main head (12) is embodied with first channels (50, 52) and the nozzle body (14) is embodied with second channels (58, 60) which are flow-connected to the first channels (50, 52). The/each mouthpiece (32, 36) has a central body (74, 76) and a sleeve body, (78, 80) surrounding said central body. On its lateral surface (82, 84) facing the sleeve body (78, 80), the central body (74, 76) is embodied with wound plastics distributor grooves (86, 88) which are flow-connected by means of connecting portions (114, 120) to a concentric annular groove (112, 116) which is formed on the reverse surface (90, 92) of the central body (74, 76) and into which the second channels (58, 60) of the nozzle body (14) discharge.

Abstract: A method includes steps of extruding rubber or synthetic resin mixed with short fibers from a sectionally annular mold opening, and molding a cylindrical body of rubber or synthetic resin with short fibers oriented in a predetermined direction. The mold opening has an expansion portion 9 whose diameter expands in an extrusion direction, and a flow passage width Wi of an inlet portion 6i of the mold opening, a flow passage width Wo of an outlet portion 6o, and radiuses Ri and Ro of the inlet portion 6i and the outlet portion 6o respectively that are coaxial with the mold opening satisfy a relation of Wo/Wi<Ro/Ri. The value of Ro/Ri is adjusted within a scope of 2?Ro/Ri?8 by changing the radius Ri of the inlet portion according to mechanical properties in the circumferential direction of the cylindrical body to be molded, so that orientation of the short fibers is adjusted.

Abstract: The invention relates to a method and a device for the production of blow-molded two- or multi-layer containers made of thermoplastic, and a plastic container produced accordingly, having view strips, particularly for storage and for transport of contents. To this end, molten plastic material is deflected in an extrusion head (10) from the inner, natural-colored layer (34) of the tubular preform (18) into the outer layer (36) in a process technical step, and incorporated there, whereby a view strip (24) is formed in the colored outer plastic layer (36).

Abstract: The present invention relates to a process for manufacturing a shaped article such as tubes, and hoses comprising processing a fiber-reinforced thermoplastic polymer in an extruder apparatus.

Abstract: A process for making a UHMWPE tape comprises providing a fluid composition comprising HMwPE and/or UHMwPE; extruding a fluid tape from the fluid composition from an extrusion die (100); cooling the fluid tape to obtain a solidified tape and drawing the solidified tape in at least one direction in at least one drawing step at a draw ratio of at least (3) in the machine direction.

Abstract: An electric cable for conveying signals, the cable having a diameter of less than 2 mm and comprising at least one conductor in an insulating sheath, the sheath having a dielectric constant ? of less than 1.7. To achieve this, the sheath is made of PTFE and it includes at least one continuous cell.

Abstract: A die for forming a honeycomb structure is provided with back pores through which a forming material is introduced and slits through which the forming material is extruded into a lattice-like shape, and the die comprises a first plate-like member made of a super hard alloy containing tungsten carbide and a bonding agent and provided with the back pores extending in a thickness direction; and a second plate-like member bonded to the first plate-like member, made of the super hard alloy containing tungsten carbide and the bonding agent, and provided with the slits connected to the back pores, wherein the bonding agent is dispersed in a lesser amount in a bonded part between the first plate-like member and the second plate-like member than in the other part.

Abstract: A device for making a profiled insulation having an extrusion die with an extrusion tip and a polymer chamber surrounding the extrusion tip. The polymer chamber has at least one air chamber therein. The air chamber is held in place and coupled to the outside of the extrusion die by a vertical fin extending outwards from the extrusion tip. When molten polymer flows through the polymer chamber around the air chamber, an opening is introduced into the polymer such that the profiled insulation is formed as the polymer exits the extrusion die, having a longitudinal cavity therein corresponding to the location of the opening formed by the at least one air chamber.

Abstract: An extrusion die configured to have an interior chamber sealed from the atmosphere is disclosed. The extrusion die includes an extrusion die head disposed at a downstream end of the interior chamber; and a vacuum seal disposed at an upstream end of the interior chamber; wherein the vacuum seal is configured to selectively form a seal between the extrusion die and a product disposed in the interior chamber. The vacuum seal includes an annular sealing surface disposed at an inner diameter of the vacuum seal; a hollow, interior chamber; and a plurality of bellows disposed between the annular sealing surface and the extrusion die; wherein the vacuum seal is configured to selectively form a seal between the extrusion die and a product disposed in the interior chamber. A method of selectively sealing an end of an extrusion die is also disclosed.

Abstract: An extrusion die comprises a die body defining a die cavity (18). The cavity (18) is shaped such that the die body includes a male portion (24) and a female portion (26). A leading edge (18a) of a part of one side of the die cavity (18) is out of alignment with a leading edge (18a) of an opposing part of the die cavity (18), at rest, such that, in use, when deflection of parts of the die occurs, the leading edges (18a) substantially align.

Abstract: An apparatus for the manufacture of a thermoplastic blown film is provided having a blower head for extruding a film tube of a thermoplastic material. An annular ring is provided for blowing a cooling gas on an outside surface of the film tube to solidify the film tube. This cooling gas is directed in a flow direction parallel to a wall of the film tube. The cooling gas is drawn off the tube by means of a suction ring positioned around the tube prior to flattening the tube to form a film tube.

Abstract: A support arrangement retains several calibration dies of a calibrating device disposed one after the other in the extrusion direction on a calibrating table of an extrusion plant. The support arrangement includes a support plate and a mounting plate separate from it. A joint arrangement is disposed between the support plate and the mounting plate and enables the support plate to be spatially displaced relative to the mounting plate.

Abstract: A die was provided for forming a honeycomb body having a structure provided with groovy slits on a front face thereof, the slits being formed by cell blocks and back holes on a back surface thereof, each hole being communicatively connected with the slit. The die is made of cemented carbide having wear resistance. The cemented carbide is formed by compacting, followed by sintering at high temperature, metal carbide powder of transition metal element series with an iron group metal binder having toughness. A connection area ratio of the back hole and the cell block is 35 to 65%.

Abstract: The invention relates to a blow head for producing blown tubular films from thermoplastic materials. Films produced by conventional blow heads often have dull strips or wavy areas, the so-called spiral strips. The aim of the invention is to avoid these negative film properties. For this purpose, the blow head comprises a plurality of annular gap-shaped melt channels arranged concentrically around the center axis of the blow head, the spiral distributor of the inner melt channel being arranged on the inner limiting wall in relation to the center axis of the blow head and the spiral distributor of the outer melt channel being arranged on the outer limiting wall in relation to the center axis of the blow head.

Abstract: Device for extruding hollow strands from thermoplastic material, with an extruder head, having a mandrel, and a calibrating device, for making a dimensional change while production is in progress, and with a radially adjustable inlet, at least one Ranque vortex chamber being formed in the mandrel, the cooling air outlet of which chamber leads into a cooling tube, which extends as an axial extension of the mandrel through the inlet of the calibrating device and has a cooling air outlet opening out into the calibrating device. This device achieves the object of providing a device with which effective interior cooling is achieved in calibrating devices designed for making a dimensional change while operation is in progress.

Abstract: Numerous aspects concerning a blow film system are improved by the present invention.

Abstract: A die for forming a honeycomb structure includes a die base having a first plate-like member and a second plate-like member, the first plate-like member is provided with groove portions on the side of a bonding surface between the first plate-like member and the second plate-like member, and a depth y (mm) of the groove portions satisfies: y?a·(t1×E1+t2×E2)/(t1×t2×E1×E2) where t1 is a thickness (mm) obtained by subtracting the depth (mm) of the groove portions from a thickness (mm) of the first plate-like member, E1 is an apparent volume elasticity (GPa) of the first plate-like member at 25° C. in consideration of a state in which back holes are formed, t2 is a thickness (mm) of the second plate-like member, E2 is a volume elasticity (GPa) of the second plate-like member at 25° C., and a is a coefficient determined based on conditions during manufacturing.

Abstract: In certain aspects of the invention, an extrusion apparatus for making a multilayer article includes multiple discs, each of which has at least one passageway configured to permit fluid flow therethrough in a flow direction. At least one of the discs includes a cone shaped portion extending substantially parallel to the flow direction.

Abstract: A method and apparatus for casting concrete elements with varying, determined length, equipped with one or with a plurality of longitudinal hollow cores, by means of a slipforming apparatus. The apparatus is movable with respect to the bed (2), said apparatus comprising forming members (10) for forming hollow cores. The mass is fed in the first step to the portion of the slab below the hollow cores, and in the second step the hollow-core forming members being brought onto the said portion of the slab and mass is being fed between the forming members and onto them. The forming member (10) for forming a hollow core comprises an attachable extension part (22). The height of a hollow core is changed by changing the extension part of the hollow core forming member.

Abstract: Disclosed are expanded polytetrafluoroethylene products, such as porous polytetrafluoroethylene tubes, having high axial tear strength and a process for their production. Each expanded polytetrafluoroethylene product has a microstructure, which comprises fibrils and nodes interconnected with each other by the fibrils, and has an axial tear strength of not lower than 6,000 gf/mm as calculated in accordance with the following formula: L/[T×(V/100)] where L (gf) is an axial tear load, T (mm) is a wall thickness, and V (%) is a volume ratio of resin. The process for the production of the expanded polytetrafluoroethylene product includes a high-speed extrusion step.

Abstract: A method for extrusion molding a medical tube from a soft thermoplastic resin. The method requires the use of a mold that provides flow paths sandwiching the axial portion. The mold comprises a mold body, a pin, and a land portion. The extrusion method involves three processes.

Abstract: Cylindrical extrusions having multiple colors, capable of serving as parisons for subsequent blow molding operation, are formed in an apparatus in which plastics of each color to be incorporated in the finished product are fed by separate extruders to an extruding head having a stack of cylindrical spools each formed with a number of apertures around their periphery. The apertures in each spool are interleaved with corresponding apertures in the other spool or spools. The interiors of the apertures are fed into a conduit which extends coaxially with the axes of each of the spools so that the outputted plastic has multicolored stripes along its length. In an embodiment in which the spool is rotated in timed relation to the feed from the extruders, the output is twisted along the central axis to form a “barber pole” stripe arrangement. In an alternate embodiment a programming plate is disposed beneath the output.