Abstract: A coating apparatus and process for coating selected surface areas of extruded substrates with decorative or functional coatings by passing the extruded substrates emerging from the extrusion die through a coating block. The coating block contains a coating cavity die conforming to the selected surfaces to be coated wherein liquid coating is supplied to the coating cavity die in a manner to selectively coat the selected surfaces on the extruded substrate.

Abstract: A method of manufacture of a extruded vinyl product to provide a textured stake construction includes an extruder screw and a die having specific structural, and dimensional characteristics and temperature parameters. The extruder screw has a flight depth in the meter zone which is about one half the flight depth in the feed zone and deeper than extruder screws of conventional design. The die includes a frusto-conical section connected to a cylindrical passage. The extruded vinyl stake will have a knobby or textured surface.

Abstract: A criss cross coating hopper 10 is provided which is capable of producing uniform flow distribution patterns. The hopper 10 is comprised of a first and second hopper halves 12,14. First and second hopper halves 12,14 each have a first and second planar surface 20,40, respectively, adjoining a first and second cavity 22,42, respectively, each cavity 22,42 having a land surface 28,50 near the entrance end 26,48 and exit end 24,46. Inserts 62,64 are positioned against the land surface 60 of the first hopper half 12 and the land surface 50 of the second hopper half 14, respectively. The first and second hopper halves 12,14 and the inserts 62,64 cooperate to form an exit slot 69 recessed into first and second planar surfaces 20,40.

Abstract: Processing, particularly extruding polyolefins having low MI, narrow MWD at extrusion temperatures less than about 200.degree. C. and at shear rates less than about 2000 sec.sup.-1 but immediately above the shear rate corresponding to the end of the slipstick region of the polyolefin produces a new window of processing conditions to produce smooth polymers that do not have sharkskin melt fracture or wavy surfaces.

Abstract: In the manufacture of a battery cell, a shear thinning cathode material that has been mixed to a homogeneous state is transported to an extrusion opening while being subjected to a non-decreasing shear stress. The shear thinning cathode material is extruded onto a conductive substrate material at a constant rate. An electrolyte material is applied over the shear thinning cathode material, and an anode material is applied over the electrolyte material.

Abstract: An extrusion die is used for producing ceramic honeycomb materials. It is particularly useful in producing such extrudates in sheet form by configuring the die in the form of a cylinder and providing a cutting device proximate to the exterior of the cylinder so that when relative rotation is imparted between the cutter and the cylinder, a honeycomb sheet is removed. A cover can be provided over the exterior surface of the cylindrically-shaped die to permit formation of honeycomb extrudates in pellet form.

Abstract: A method and die apparatus for manufacturing a honeycomb body of triangular cell cross-section and high cell density, the die having a combination of (i) feedholes feeding slot intersections and (ii) feedholes feeding slot segments not supplied from slot intersections, whereby a reduction in feedhole count is achieved while still retaining good extrusion efficiency and extrudate uniformity.

Abstract: A method and die apparatus for manufacturing a honeycomb body of rhombic cell cross-section by extrusion through an extrusion die of triangular cell discharge slot configuration, the die incorporating feedholes at selected slot intersections only, such that slot segments communicating directly with the feedholes discharge web material and slot segments not so connected do not discharge web material, whereby a rhombic cell cross-section in the extruded body is provided.

Abstract: The present invention relates to an apparatus and method for extruding a Bingham plastic-type material through a die having an auger rotationally mounted therein.

Abstract: Equipment for briqueting plant stalk-produce, includes a conical-screw compactor, a tubular press-cavity, an annular degassing device and a control device including a molding pressure sensor. The annular degassing device adjoins a discharge aperture of a compactor space with a plurality of narrow-axial degassing slits open to the atmosphere, which issue into the discharge aperture of the compactor space.

Abstract: An automated system for casting hollow fiber membranes into a variety of prescribed shapes, including spiral, linear, circular and rectangular. The system also has the capability to change the configuration during casting, which increases productivity. A co-extrusion die is rotated over a stationary coagulation bath A computer is used to control the motion of the die to make a membrane with the desired shape The nozzle is oriented in a manner that will compensate for distortions that occur in wall thickness in the area of a bend. In addition, the nozzle's annulus is offset to make the leading portion of the annulus slightly thicker and the trailing portion thinner at the point where the fluids exit the nozzle, which results in a uniformly symmetric wall thickness. A system embodying the invention includes X, Y and .theta.-directional servomotors 1A-1C (FIG. 1), each of which is coupled to an associated position encoder 2A-2C.

Abstract: An dome-shaped extrusion die for use in forming honeycomb monolith structures is disclosed. The die is formed by deforming an extrusion die having a flat cross section to obtain a dome-shaped cross section. Alternatively, the die may be fabricated from sinterable ceramic or metal powders in which case the holes and slots may be formed either in the green state, or in a chalk-hard state after partial densification.

Abstract: A method for manufacturing a fiber reinforced elastic sheet by extruding and processing an elastomer containing staples by 25 volume % or less. The elastomer, which uniformly flows in a sheet width direction, passes through a slight clearance of a molding die in the vertical direction of the sheet, and then the elastomer flow is enlarged in the vertical direction of the sheet. A flow adjustment portion is provided in a passage of the elastomer to flow uniformly in the sheet width direction, and a weir portion is provided on the downstream side of the flow adjustment portion. A clearance Wo of an outlet in the vertical direction of the sheet, a clearance Wi formed by the weir portion in the vertical direction of the sheet and a distance l between the weir portion and the outlet have the relationship ofWo/Wi.gtoreq.2l.gtoreq.3Wo0.3 mm.ltoreq.Wi.ltoreq.5 mm.

Abstract: The present invention relates to the integral extrusion of closure profiles and a film through a film die. The present invention provides an apparatus for integrally extruding a film and closure profiles from a single stream of molten material and, consequently, eliminating any joining problems between the film and the closure profiles. The present invention utilizes a removable die lip with removable profile wedges that mount in the die lip and extrude the closure profiles and a film together from a single stream of molten material. In this manner, the closure profiles and the film are integrally formed, and if a new closure profile design is desired, the present invention permits the quick and economical replacement of a removable profile wedge with another.

Abstract: For the purpose of mass-producing sheet pallets made of a synthetic resin with a high productivity and without difficulty, an apparatus for manufacturing sheets is provided, which apparatus includes a process (1001) to feed sheet materials in a predetermined shape and having corner portions, a process (1002) to form sheets of a desired shape by cutting at least the corner portions of said sheet materials and a process (280) to stack said sheets

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

Abstract: Fibrous network structures are produced within liquid polymer resins by passing the fiber-containing resin along a channel having a plurality of sets of flow modifying elements which establish a regulated succession of velocity profiles for the principal flow direction and the two directions perpendicular thereto. The individual velocity profiles persist over distances which are small compared to the channel dimension over which they are established and are such that there is substantially no net deviation from the principal flow direction. The velocity profiles superimpose on each other to cause rotation and sliding of the fibers so that a coherent network structure is built up which persists through extrusion dies and molds into the solid state. By means of a large number of touches per fiber the structures thereby established confer efficient mechanical reinforcing properties and enhanced thermal properties on the polymer composition.

Abstract: Described is a spinnerette plate for the manufacture of multilobal fibers which at least has one opening having a plurality of lobes, each lobe having two ends, one end being connected to the other lobes, the other end of each the lobes radiating outwardly and each lobe having a plurality of projections alternating along the contour of each lobe.

Abstract: An extrusion head (1) defined by a number of superimposed plates (7,8,9,10) and by a casing (55) housing the plates (7,8,9,10) and defining two shoulder surfaces (68,69) forming an angle and perpendicular to the plates (7,8,9.10); the plates (7,8,9,10), when packed together, defining an intermediate guide duct (35) for guiding reinforcing wires and two supply ducts (11,23) for supplying extruded elastomeric material located on opposite sides of the intermediate duct (35), and providing for locking together a wire guiding device (36) and a die (37) presenting respective flat shoulders (42,43;50,51) parallel to a first (68) of the shoulder surfaces (68,69) and pressed by the plates (7,8,9,10) into contact with one another and with the first shoulder surface (68), with the die (37) located between the first shoulder surface (68) and the wire guiding device (36).

Abstract: A spinneret made from a hardened metal plate having one or more slot shaped capillaries exiting the face of the spinneret. The walls of the capillaries taper toward the face of the spinneret, and each capillary has a length to width ratio of greater than about 2.

Abstract: Disclosed is a light waveguide ribbon mold having a nozzle port shaped to closely receive the heated nozzle of a portable melt adhesive gun. Light waveguides are pulled by hand through a slot in the mold so that the melt adhesive forms a ribbon matrix around the light waveguide. The ribbon cools and hardens upon exiting from the mold.

Abstract: Apparatus for the continuous extrusion of composite solid articles from a substantially uniform mixture of particulate binder material and particulate primary material in which the feed mixture is forced through an extrusion die of substantially uniform cross-section and subject to heat, pressure and cooling which consolidates the feed mixture whereby it emerges from the die as a solid composite article and in which the pressure in the extrusion die is supplied by back-pressuring external of the die.

Abstract: An apparatus for producing extrusions, such as optical waveguide plug prongs or sheaths with a central opening, from a deformable composition, includes a receiving body having an outlet opening and having an interior tapering conically at a predetermined first angle of conicity toward the outlet opening. A flow body is to be inserted into the interior of the receiving body. The flow body has an end portion tapering conically at a predetermined second angle of conicity. The second angle of conicity is smaller than the first angle of conicity. A retainer retains the flow body in the interior of the receiving body. The retainer is resilient in radial direction of the interior of the receiving body.

Abstract: A screw-type front extrusion granulating apparatus for forming moistened powdered raw material such as chemicals for use in the agriculture, pharmaceutical, or food industries into granules, has a conveying screw in axial alignment with a semi-spherical die, the die having a plurality of die openings formed therein. The conveying screw has an extrusion blade mounted to its forward end to project into the confines of the semi-spherical die, the contour of the extrusion blade generally conforming to the inner surface of the die. In operation, the moistened powdered material is transported forwardly under pressure by the screw and extruded through the die utilizing the pressure of the screw and the scraping action of the extrusion blade.

Abstract: This shaping device, designed to subject the linearly extruded product to a continuous cooling operation or hot vulcanization operation during shaping is in the form of a tunnel (1) the outer casing of which has incorporated internal channels (A) which do not open out into the inside of this outer casing and which circulate a liquid or fluid at a temperature determined on the basis of the cooling or vulcanization operation chosen, this tunnel having on the inside, mounted in a vertical position, several matrices (FIG.

Abstract: The present invention provides a novel extrusion apparatus and process that avoid flow stream divergence. More particularly, an improved end feed, extrusion apparatus and process are provided. Compensation by gap adjustment is beneficially reduced.

Abstract: A process for producing a high modulus article includes forcing a high molecular weight plastic material, such as polyethylene, through a passage of which the cross-sectional area diminishes in the forward direction of plastic flow, thus producing an extrudate. The plastic material is extruded while it is close to or at its melt temperature, and it is lubricated to obtain substantially plug flow through the passage. The speed at which the plastic material flows through the passage is adjusted so that the elongational velocity gradient at any longitudinal position within the passage does not exceed about 2.6 sec..sup.-1, thus minimizing the degree of molecular orientation in the extrudate. The extrudate can be deformed by drawing while it is maintained at or close to its melt temperature, thus producing an oriented, deformed extrudate. The oriented extrudate is then quickly cooled to preserve the orientation.

Abstract: Dies are disclosed for forming sheet-like extrudate of fluent material, such as a film of thermoplastic or solvent-plasticized material, or a liquid coating, e.g. a photographic coating, on a continuous support web. The dies include inner and outer cavities with the fluent material being supplied to the center or an end of the inner cavity. Between the inner and outer cavities there is an inner slot and between the outer cavity and the exterior of the die there is an outer slot. The inner cavity is open at one end, if end fed, or at both ends, if center fed. The open end, or each open end, is closed by closing means which are detachable for allowing access to the inner cavity for cleaning and inspection. A member is located in the cavity extending from the open end or each open end. The member serves to reduce the effective flow path for fluent material in the inner cavity.

Abstract: An extrusion device (1) the extrusion head (2) of which features a number of superimposed shaped plates (9, 10, 11, 12) clamped together by a clamping device (3) located and operating externally of the extrusion head (2) about which it defines a releasable ring device; the extrusion device (1) having an automatic release device (4) for separating the shaped plates (9, 10, 11, 12) when the ring device is released.

Abstract: An extruder head made up of several segments including a first section made up of at least two plates bolted together. At least one plate is hingeably mounted to another plate in the first section to provide access to an extrudate passage defined by the plates. Downstream of the first section is a pair of mating blocks bolted to the first section further defining the extrudate passage. Inserts of hardened steel are provided and held by the plates and blocks forming the extruder head and the inserts define parts of the extrudate passage. A cooling liquid chamber is provided in at least one insert to cool the wall forming the passage. Although the passage is continuously restricted in the downstream direction, to increase the pressure of the elastomeric melt, intermittent portions of a slightly greater cross-sectional area are provided to allow expansion and thus intermittent lower pressure of the melt as it passes through the passage.

Abstract: An extrusion tool is provided for extruding a coating jacket onto a least one pre-coated conductor or conductor bundle. The extrusion tool comprises a frame, a first conical element, a second conical element, and a die. The frame is formed to include a port positioned to receive a coating material. The first conical element is mountable on the frame and is formed to include a bore, the bore being sized to allow passage of the pre-coated conductor or bundle therethrough. The second conical element is mateable with the first conical element and cooperates with the first conical element to define a first flow passageway therebetween. The first flow passageway is positioned to receive the pre-coated conductor or bundle as it exits from the bore and is connected in fluid communication with the port to supply an initial portion of the coating jacket. The second conical element also includes a tapered portion and terminates in a cylindrical tip.

Abstract: An apparatus for making a noodle base having a construction wherein raw materials of a noodle base are kneaded and stretched in an arbitrary direction by a screw conveyor and extruded as a noodle base having a thick sheet-like form. The extrusion die has a split die structure consisting of a die main body having the upper surface thereof open and a cover body supported rotatably at the base end portion of the die main body and covering the open portion of the die main body, and the cover body is provided with a cover body pushing member for pushing the tip portion of the cover body lest the cover body float up, and for adjusting the height of an extrusion port of the noodle base by adjusting the height of the tip portion of the cover body relative to the die main body.

Abstract: In a laminar extrusion, overlapping layers of an EVOH phase are dispersed into a PP or MAPP matrix phase incompatible with the EVOH phase to form a vapor, gas and/or organic liquids barrier. When the matrix phase is a PP phase, MAPP can be added to improve adhesion between the overlapping layers and the matrix phase. MEPR and/or PE can also be mixed with the EVOH and/or PP phase to adjust the mechanical properties of the extrusion. In order to produce the extrusion, a molten polymer blend including bodies of the EVOH phase dispersed in the PP or MAPP phase is first prepared and then extruded through a die unit. In the die unit, a converging extensional flow is produced to lengthen the dispersed bodies of EVOH phase in a first direction while a diverging extensional flow lengthens these bodies in a second direction transversal to the first one. Such lengthening of the bodies produces in the extrusion the overlapping layers of EVOH phase.

Abstract: The present invention relates to spinnerets for forming synthetic filaments having a trilobal or tetralobal cross-sectional shape with substantial convex curves, connected by cusps, along the contour of each lobe. The filaments are especially suitable for making carpets which exhibit low glitter, high bulk, and resistance to fibrillation. The spinnerets have a central circular orifice with three or four radial slots radiating from the orifice. Peripheral orifices are located on the longitudinal axis of each radial slot.

Abstract: A die for use in an extrusion process is disclosed wherein the die is formed with a flow channel, a portion of which is defined by a removable insert. The insert includes a static mixer arrangement over a predetermined portion thereof in order to create a turbulence in the extruded material to produce a sheet or film having a uniform cross-section. The static mixer arrangement can be included of variously shaped projections which are secured to respective removable inserts. Since the insert defines a portion of the flow channel, the size and shape of the land associated with the die can also be varied.

Abstract: A calibrating unit for an extruder includes an inner calibrating member, and a plurality of outer calibrating members at least partially surrounding the inner calibrating member and forming a gap therebetween through which a plastic material may be extruded, the plurality of outer calibrating members including a base member and at least a first lateral member. The calibrating unit also includes an integrated joint connecting the first lateral member to the base member. The first integrated joint includes a circular cylindrical hinge pin integrally formed along a longitudinal edge of the first lateral member, and a cylindrical circular bearing shell formed in the base member. The circular cylindrical hinge pin is received within the circular cylindrical bearing shell of the base member so that the first lateral member is rotatably interconnected to the base member.

Abstract: High twist fibers are produced in a spin/quench/twist process directly from a modified spinneret. The spinneret consists of capillaries that are installed in highly elongated inserts which are surrounded by heat deflecting shields surrounded by an annular concentric orifice supplied with a fluid (air or steam preferred) that simultaneously quenches and twists the emerging filaments as they exit the capillary quench/torque jet.

Abstract: A method for the manufacture of thermoplastic resin sheets, including extruding molten thermoplastic resin at an extrusion velocity V through a slit provided in an extrusion mold so as to form thermoplastic resin sheets with embossed surfaces, wherein said thermoplastic resin is extruded from said slit in said extrusion mold under conditions such that the ratio V/H of said extrusion velocity V to the width H of said slit exceeds a critical value (V/H)c, said critical value (V/H)c being the ratio of the extrusion velocity to the width of the mold slit corresponding minimum value of the roughness of the embossment formed on the surface of said thermoplastic resin sheets, whereby defects such as the adhesion to and winding onto rollers, inferior appearance and sizing marks which are prone to occur when the sheets are embossed with embossing rollers.

Abstract: A nozzle for depositing a layer of fluid mass has a coupling defining a nozzle entry passage, a body integral with the coupling which extends linearly from the coupling to a curved body portion which extends to a nozzle end which defines an exit slot. The body has a parallelepipedic cross-section shape wherein two opposing sides thereof widen and two opposing sides thereof narrow as the body extends away from the coupling at the apex of the body at the coupling to the nozzle end. The sides of the body which widen define, together with the sides that narrow, the exit slot and terminate tangentially to the horizontally plane in a form of an arc of a circle which has a center at an apex of the body.

Abstract: Capillary groups for a spinnerette include sheath and core openings to produce a spun bi-component fiber having a trilobal or triangular profile. A triangular or trilobal configured outer sheath arrangement surrounds a trilobal cross-section core which is alternatively oriented with its lobes toward the sheath tips or rotated 60 degrees thereto. Different sheath arrangements are also disclosed for producing bi-component sheath/core trilobal fibers with and without voids.

Abstract: A free-standing die assembly, for use in the production of extruded products, which is mounted as a separate unit apart from the extruder in which product ingredients are processed. The die assembly includes a center plate having a die unit secured to one or more planar faces of the plate, with each of the die units having at least one die orifice in the outer surface thereof. Hot flowable dough processed in an extruder is carried via suitable tubing to the center plate from where it is distributed to the planar faces of the plate and into the die units, from which it is extruded through the die orifices in the die units. The die assembly may be modified to permit the production of coextruded product from the die orifices in the die units of the assembly. One or more of the die assemblies may be associated with a single extruder. In accordance with a preferred embodiment, die units are secured to opposing side faces of the center plate to provide a free standing, dual-faced die assembly.

Abstract: The invention relates to an apparatus for extruding a polymer profile directly onto the surface of a glass plate and particularly along a peripheral edge thereof. The extruded polymer profile is provided with a sealing and centering lip located on and projecting over the circumferential peripheral surface of the glass plate. The extrusion die has at least one supply channel for the polymer to be extruded. One supply channel or portion thereof leads the polymer material substantially to the portion of the die orifice directed toward the center of the plate. The other supply channel essentially supplies the portion of the orifice directed toward the outside. The supply channel may be provided with a shutoff device which regulates the volume flow. The regulation of the shutoff device takes place as a function of the radius of curvature (R) of the path covered by the extrusion die.

Abstract: Novel method and apparatus is disclosed for forming an integral skin on an extruded honeycomb structure, wherein the skin material is collected in a peripheral area of a die body, is passed through an adjustable flow control gap, and then through a predetermined gap thickness of a skin forming slot so as to then knit with the honeycomb structure extruded by the die prior to being extruded from the die. A plurality of flow control plates having different internal peripheral diameters are provided so as to provide different flow control gaps, as desired. In addition, a plurality of shims having different thicknesses are provided so as to position the mask a given distance away from the die, and thereby control the skin thickness gap. The die may be formed by merely relieving a peripheral portion of a typically automotive catalytic converter extrusion die and providing a trim ring about the relieved portion so as to inhibit the flow of batch material from partially open feed holes.

Abstract: Process of melt extruding through an extrusion die whose surface is coated with one or more metal oxides, M.sub.x O.sub.y, wherein M is a metal selected from the group consisting of Ti, Zr, Cr, Fe, Ni, Pd, Pt, Cu, Ag, Au, Al and Si, and x and y are selected to satisfy the valencies of M, a difficultly-melt-processible polymer containing 0.002-2 parts by weight, based on the weight of the polymer, of at least one melt-processible fluorocarbon polymer processing aid having a fluorine to carbon ratio of at least 1:2 and having metal oxide-reactive sites capable of reacting with or physically associating with the metal oxide of the die surface.

Abstract: The plate for extrusion, having discharge holes equipped with fitted inserts, in which the discharge holes each possess a seating having a circular base surface and an outlet opening at the surface of the plate having a substantially elliptical outline, the major axis of the ellipse being equal to the diameter of the base surface, an insert being fitted in the seating which possesses a base surface, facing towards the inside of the plate, having a substantially elliptical outline which can be inscribed, with slight clearance, inside the opening of the seating, and having an opposite surface, facing towards the outside of the plate, having a circular outline with its diameter equal to the minor axis of the base.

Abstract: A slot die head for emitting a coating fluid onto a moving web has a slot orifice, the exit end of which is defined by replaceable inserts, the downstream one of which, relative to the direction of web movement, has a wiping flange cantilevered from a hinge portion thereof. The flange is disposed in use in facing relationship with the web and extends downstream from the slot orifice, so as to be resiliently hingedly movable in directions substantially normal to the web surface for maintaining constant shear levels across the coated area.

Abstract: An extrusion die for forming honeycomb type structures, such as filters. In a typical prior art extrusion die, the feed holes are circular in cross section throughout their length and feed into respective intersecting discharge slot portions. There is an abrupt change in cross section area and shape, from circular to cross shaped, at the entrance to the discharge slots. This construction results in flow inhibiting land portions at the entrance to the discharge slot portions. Such a construction causes bending forces or moments on these flow obstructing entrance portions of the discharge slots and also subjects them to increased abrasive wear whenever the material being extruded contains ceramic or other hard particles. By this invention, the feed holes are uniformly tapered from an annular or polygonal transverse cross section at their input ends to a (conventional) cross shape at their outlet ends where by feed the discharge slots.

Abstract: Improved process for extruding through a die a difficultly-melt-processible polymer, especially a polymer containing an additive such as an antiblock agent. There is first extruded through the die a polymer resin containing 0.001 to 1 wt. % of a copolymer of tetrafluoroethylene and a functional-group-containing monomer that is terminated in a -CF.sub.2 W group wherein W is selected from -SO.sub.2 F, -SO.sub.2 Cl, -SO.sub.3 M, -COOR and -COOM, R is a C.sub.1-3 alkyl radical and M is H, a metal cation or an ammonium or quaternary ammonium cation, and thereafter there is extruded through the die the difficultly-melt-processible polymer admixed with 0.001-1 wt. % of a fluoropolymer process said having a fluorine to carbon ratio of at least 1:2.

Abstract: A die assembly for use in a continuous extrusion apparatus is made up of two cooperating members. The first member has tapered apertures therethrough disposed symmetrically about a mandrel portion. The mandrel portion cooperates with a throat portion in the second member to define an extrusion gap. A ceramic insert can be located in the second member to reduce wear during the extrusion of materials such as copper.

Abstract: An extrusion die for extruding a honeycomb-shaped structure having rectangular channels. The die is formed of a hard, rigid material, preferably metal, and includes a body plate and an abutting face plate. The outlet face of the body plate is brazed to the inlet face of the face plate. The body plate has a plurality of slightly staggered primary feed holes, the outlet ends of each communicating with an associated feed reservoir, the latter each defined by a recess or depression in the inlet surface of the face plate. Each feed reservoir communicates with the inlet ends of three associated secondary feed holes. The outlet surface of the face plate integrally carries a plurality of intersecting slot segments defining rectangular pins. The outlet end of each secondary feed hole communicates with and feeds an associated intersection of groove segments.