Abstract: A deflector is attached to a texturizer sprayer, the deflector being in the shape of a truncated cone with a tapered deflector wall which intercepts a portion of the stream of air-entrained texturizing material emitted by the sprayer. The deflector forms a more concentrated stream and focused spray pattern. The deflector includes a collection chamber for collecting and retaining texturizing material failing to exit the open end of the deflector. Support legs are provided to support the combined texturizer sprayer and deflector.

Abstract: An apparatus for efficiently applying a subject liquid on an object of interest is disclosed. The apparatus includes a metering device (30), a discharge tube (280) and a nozzle (290). The metering device (30) includes a cylinder (115) and a piston (165) which is operatively disposed within the cylinder to define a metering chamber (177) ahead of the piston. The metering device (30) includes a liquid inlet (108) and a liquid outlet (109). Fluid flow to the liquid outlet (109) is controlled by a check valve (130). The piston (165) is driven forwardly through a working stroke to force the liquid in the metering chamber (177), out of the metering chamber, and past the check valve (130). The piston (165) breaks the plane of the open end of the cylinder on each working stroke to preclude entrapment of air in the metering chamber (177), and thus provide for a more accurate metering. The nozzle (290) includes a fluid passageway (301) which is disposed in fluid flowing relation relative to the metering device (30).

Abstract: An irrigation sprinkler nozzle for enhancing the distribution of close-in watering comprising a nozzle housing housing an inlet opening and an outlet opening with a tortious pathway therebetween for inducing turbulence into the water stream to produce a low pressure, small droplet size water spray.

Abstract: Sprinkling device for installation in showers at the outlet of a water pipe is provided with at least one deflector having a plurality of peripheral vanes of a central spindle which is coaxially mounted in a first, preferably cylindrical, inner chamber. The inner chamber is housed in a socket which is tightly screwed into the end of the water pipe, and has a downward extension formed by a second cylindrical or conical inner chamber which opens onto a calibrated nozzle. A perforated outlet plate can be moved towards or away from the nozzle, and forms the front of a concentric sleeve which is slidably mounted around the socket.

Abstract: A laminar flow diffuser has a plurality of round, thin, stacked plates. A central bore penetrates all the plates with the exception of the bottom plate. The diffuser is secured to the vacuum chamber port. When gas enters the port, it enters the central bore and then flows radially outward through the interplate spaces to the outer circumference of the plates and subsequently into the periphery of the chamber. The diffuser thereby provides a controlled laminar flow which prevents turbulence in the chamber and hence, reduces the possibility of contamination to the workpiece in the chamber. The laminar flow diffuser is easily cleaned, both during its initial assembly and later after use, because it chiefly has flat surfaces which do not harbor dirt or gas.

Abstract: A nozzle assembly for dripless, splashless dispensing of liquids of various viscosities is comprised of three elements: a tubing terminator, a nozzle body and a nozzle head. The tubing terminator is adapted at a first end to accept fluid flow from a compressible tube into a central bore, which does not extend all of the way to the second end, but ends with at least one radial bore. When the tubing terminator is inserted into the nozzle body and fluid flow is initiated, the fluid leaving the terminator impinges an intermediate bore portion having walls angling away from the longitudinal axis of the nozzle body. This impingement serves to swirl the fluid and minimize dripping and splashing. A nozzle head, which covers the flow chamber into which the intermediate bore portion of the nozzle body opens, has a wire mesh screen covering the opening out of which the fluid is dispensed.

Abstract: A gas burner used in glass melting furnace comprising a mixing tube having a perforated mixture for mixing fuel gas with air inspirated by gas flow, means for supplying fuel gas to the mixing tube and an inspiration tube located in the mixing tube. The perforated mixer is situated inside the mixing tube at the end of the inspiration tube. The gas burner also comprises a means for moving the air inspiration tube longitudinally with respect to the mixing tube and a seal located between the perforated mixer and the inside surface of the mixing tube to allow the perforated mixer to move longitudinally with respect to said mixing tube.

Abstract: A surge enhanced cavitating jet for a fluid jetting system. The cavitating jet includes a nozzle portion having a conical throat followed by a fluid separating section. Immediately downstream from the separating section is a substantially cylindrical surge section. The length and inside diameter of the surge section are sized such that a minimum annular area is defined between the inside diameter of the surge section and the outside of the fluid stream as the fluid discharges from the cavitating jet such that cavitation is contained in the surge volume. The fluid stream does not impinge the inside diameter of the cavitating jet. A jetting system including a pump and valve is also disclosed.

Abstract: A fuel injector assembly has an outer body that is fixed to the cylinder head and an inner valve that moves to a fixed open position to discharge a fuel/compressed air or gas mixture into the combustion chamber. A control sleeve surrounds the injector body and is axially movable with respect to it to various positions to interact with the spray pattern of the fuel mixture being discharged from the nozzle to vary the shape or pattern of the fuel spray as a function of different engine operating conditions.

Abstract: A duocone spray nozzle having two concentric peripheral orifices which will produce two hollow spray cones, one inside the other. Each orifice size is varied by employing its own spring and each spring acts independently and is compressed under its own pressure drop. The springs are designed so that the inner spring will open the inner orifice at a pressure drop which is lower than the pressure drop occurring at the outer office. Therefore, the inner spray cone occurs before the outer spray cone. When the pressure drop at the inner orifice exceeds a predetermined value, the outer orifice opens and after this occurs there will be two spray cones. A hold structure aids in separating the two spray cones.

Abstract: An air guiding arrangement for welding materials having plastic films includes a device to supply a uniform hot-air stream at any given air velocity. The air guiding arrangement has a nozzle which contains a swirl chamber functioning as a diffuser which tapers in the shape of a funnel. The nozzle is preceded by an adjustable air divider through which the amount of air to be supplied to the welding site is varied. The hot-air welding machine serves for a seam-shaped connection of plastic containing materials providing uniform heat distribution in the welding gap.

Abstract: A device for rinsing a razor blade head fits on to a faucet and receives tap water at line pressure. The device then channels the tap water to provide a high pressure source of directed water jets for cleaning shaving razor blades, especially of the multi-blade variety. The razor blade is inserted into a bottom cavity of the device where it is cleansed of debris by tap water channeled at high pressure through a series of conduits into the cavity. The water then exits out the body through the bottom of the cavity.

Abstract: A valve especially adapted for dispensing problematic beverages such as pressurized slurries of frozen or semi-frozen material comprising a valve body, an end cap, an inlet, a valve bore with an outlet, and a valve seat having a specially designed passageway that directs fluid flow toward the walls of the valve bore rather than axially toward the valve outlet.

Abstract: Apparatus and method of generating flat liquid sheet sprays by means of simple cylindrical orifices. One form is a container having an interior closed end with the exception of an orifice disposed eccentrically of the closed end to enable generation of a fine spray through the orifice. The orifice is rounded on the outside of the closed end. The orifices may extend radially outwardly instead or may take other forms.

Abstract: An irrigation sprinkler having a body to which is fitted a cap. Water issues from a nozzle in the body to impinge on the end of the cap, the end of the cap having an internal surface formed by revolution of an arc about the axis of the cap. Apertures are formed by serrations in the curved surface opening through a conical surface in the end of the cap.

Abstract: A dispensing tool for use with dry chemical fire extinguishers utilizes an elongated wand bent near the discharge end through which the chemical is delivered. A dispersion baffle is affixed at the outlet of the wand to deflect the chemical radially. A horn surrounds the baffle and redirects the chemical in a dispersed stream onto a fire at a much lowered velocity such that the impact of the chemical on the burning material does not dislodge sparks or embers which lead to secondary fires.

Abstract: A spray guard adapted for use with a wand for spraying a liquid onto vegetation, the wand having a cylindrically shaped discharge tube and a nozzle tip attached to the end of the discharge tube. The spray guard includes a dome having an open end and provided with an aperture through which the discharge tube may selectively extend. The dome channels, directs, and forcuses the spray emitted from the nozzle tip toward a relatively localized area.

Abstract: A rotary sprinkler comprises a nozzle formed with a bore extending through a face thereof defining an outlet orifice through which the water is to exit as an axially-flowing jet; a jet-impinging member supported close to and in alignment with the orifice so as to be impinged by the axially-flowing jet and to reflect same back towards that nozzle face; and a rotor rotatably mounted between the jet-impinging member and the face of the nozzle. The rotor is formed with a bore for accommodating the axially-flowing jet, and is further formed on its surface facing the jet-impinging member with at least one channel extending generally in the radial direction, effective to constrain the water reflected back towards the nozzle face to form at least one laterally-flowing jet, and to rotate the rotor so as to rotate the laterally-flowing jet.

Abstract: A two-material atomizing nozzle to produce a solid cone jet with a jet angle larger than 45.degree. comprises a nozzle unit with a first duct coaxial with the nozzle discharge and receiving a gaseous medium (for instance air) and a liquid medium (for instance water), a second duct orthogonal to the first duct and issuing into it serving to supply the liquid medium. To supply the gaseous medium, the nozzle unit comprises a third duct issuing into the first duct at the level of the second duct and being orthogonal or essentially orthogonal to both. A recoil bottom is provided for the premixed two-material mixture in the first duct and comprises communication apertures to an annular duct coaxial with and preceding the nozzle discharge into which it merges. The nozzle discharge also is in the shape of an annular duct, however its external boundary is flaring.

Abstract: A gasoline injector for an internal combustion engine has an orifice plate in which is formed a pair of outlet orifices through which when a valve means of the injector is operated, flow two jets of gasoline. The jets are directed within an outlet and strike a surface of a deflector member which deflects the jets before they break up to form a spray. The orifice and the surface can be arranged to form a single spray or separate sprays.

Abstract: A spreader adapted for spreading compost includes a container in which an apron conveyor is disposed to move compost toward a cylindrical brush rotatably mounted at one end of the container for discharging compost therefrom. An adjustable flow gate controls the amount of compost moved toward the brush by the apron conveyor. An adjustable impact plate and an adjustable baffle assembly direct compost discharged from the container by the brush toward the ground. The baffle assembly includes a plurality of directional vanes for properly dispersing the compost. A drape extends around the discharge side of the brush.

Abstract: A liquid spraying device comprises a nozzle formed with an outlet orifice through which the water exits as a jet flowing parallel to the axis of the nozzle, a laterally-displaceable cup member supported close to and overlying the outlet orifice so as to be impinged by the jet and to reflect it back towards the nozzle, and a deflector surface in the path of the reflected-back liquid, which deflector surface is formed with a plurality of channels extending generally radially of the nozzle and effective to deflect the reflected-back liquid and to concentrate the spray produced by the cup member along the channels. Described are a static-type device in which the deflector surface is formed in the face of the nozzle having the outlet orifice, and rotary-type devices in which the deflector surface is formed in a rotor mounted between the cup member and the face of the nozzle having the outlet orifice.

Abstract: An assembly as used with a drop tube of a moving irrigation system which allows the operator to convert from conventional spray mode operation to furrow bubbler operation. The assembly includes a pressure regulator for regulating the pressure of water to a relatively low value and having an upper end adapted to be connected in water communicating relation to the drop tube and a spray head connected at its upper end in water communicating relation to the lower end of the pressure regulator. The spray head includes a nozzle for directing a water stream downwardly in a direction to be normally interrupted by a removable splash plate into a spray pattern. A tubular structure is connected at its upper end portion with the spray head in a position to receive all of the water stream directed from the nozzle so as to transmit the same downwardly to the lower end thereof.

Abstract: A nozzle that consists of a pipe (4) with the end that extends into the treatment space surrounded by a hood (6) is employed to inject solids into a reaction space, a fluidized-bed combustion chamber for example, pneumatically. There are outlet bores (12) in the wall of the pipe (4) and below the lower edge of the hood (6). Inside the pipe (4) is an inner pipe (13) that is connected tight to pipe (14) above the outlet bores (12) and that creates in conjunction with the pipe (4) a space (14) for air to flow through. The air flowing through this intermediate space (14) and emerging from the outlet bores (12) ensures transverse intermixture of the solids inside the reaction space.

Abstract: A self-cleaning, water saver shower head which will provide a maximum flow rate without regard to water pressure and which may be adjusted from a no flow condition to a fine mist to a spray to a heavy pulsating rinse stream. The device uses a cavitation inducing orifice at the inlet to the head and a second cavitation inducing set of orifices upstream of the outlet with an elongated mixing chamber therebetween. A plunger is disposed in the outlet downstream of the second cavitation inducing orifices to direct the water exiting the device against a diffuser sleeve to define the spray. Rotation of a sleeve which defines the outlet and carries the diffuser causes axial displacement of the plunger within the outlet to provide the desired spray. In an embodiment of this invention, instead of a no flow condition, a drip condition will be produced by rotating the sleeve to cause axial displacement of the plunger until a knurled flange seats at the outlet thereof.

Abstract: In a fertilizer spreader having a reciprocatively swinging distributor pipe, a distributing device is secured to the front end outlet of the distributor pipe. The distributing device comprises an upper part; a bottom part forwardly upwardly inclined and upwardly bent at both sides form a pair of inclined side plates; and a front clash part provided with an opening therein and interconnecting the upper and bottom parts, whereby the discharge speed, direction and timing of the fertilizer discharged from the outlet of the distributory pipe are variously changed so as to spread the fertilizer relatively uniformly.

Abstract: Apparatus in the form of a shower head to aerate water is disclosed. An uninterrupted and uniform spray pattern is achieved by utilizing a terminating wall for the coaxial aperture of the nozzle and an end wall for the nozzle downstream of the terminating wall. The terminating wall is separated from the end wall by an annular moat and is radially inboard and upstream from the end wall so that it is physically protected against damage, especially at the annular intersection between the coaxial aperture and the end wall. This annular intersection is made a very sharp angle, chamfered no more than 0.003 inch, to achieve this uniform spray pattern, yet the end wall downstream thereof protects it against physical damage to maintain this uniform spray pattern and to protect the user of the shower head against injury from cuts.

Abstract: A liquid discharge nozzle that is operative for discharging liquid in a relatively narrow, elongated spray pattern. The nozzle includes a deflector having an elongated central apex portion of preferably arcuate configuration and a pair of side portions diverging from opposite side edges of the apex portion and having tines formed along the terminal edges thereof; and a frame for mounting the deflector adjacent a liquid discharge outlet so that when liquid is discharged from the outlet, at least a portion of the liquid impinges on the inner surface of the central portion of the deflector and is deflected outwardly along the inner surfaces of the deflector. Preferably, a substantially centrally disposed inwardly projecting boss of generally elliptical configuration is formed in the central apex portion of the deflector and a deflector mounting boss is formed on the frame adjacent the deflector boss.

Abstract: A flow regulator comprises a sleeve fixed within a body member and formed with an opening serving as a metering passageway, a second sleeve displaceable with respect to the fixed sleeve so as to vary the effective size of the metering passageway, a spring biasing the displaceable sleeve in the direction to enlarge the met metering passageway, and a flow sensor element carried by the displaceable sleeve and impinged by the flowing fluid so as to displace the second sleeve in the direction of restricting the metering passageway. Also described is a spray nozzle including the above flow regulator, and a deflector floatingly mounted so as to be impinged by the jet issuing from the spray nozzle.

Abstract: A method and apparatus for effecting washing, bleaching, or thickening, etcetera of paper pulp or the like utilizes stationary screens, yet provides efficient treatment without significant screen clogging. Pulp introduced into the bottom of a cylindrical upright vessel is caused to flow in particular radial segments and channels. Introduction of pulp into all channels of a particular radial segment, extraction of withdrawn liquid from the radial segments, removal of treated pulp from the top of the vessel, and the introduction of treating liquid between the stationary screens, are coordinated so that uniform treatment of the upwardly flowing pulp results.

Abstract: A paper stock diffuser system employing a plurality of spaced, generally V-shaped projections having adjoining shear surfaces diverging away from one another.

Abstract: A showerhead of the type including an inlet end, an outlet end, and a bore defining a passage between the two. Diffusing stages are incorporated within the bore. These diffusing stages consist of a plurality of orifices arranged with their centers spaced at regular intervals around a circle of predetermined diameter. A diffusing washer is rigidly mounted to the diffusing stage nearest the outlet end to deflect the water stream from a substantially parallel path to an inclined path which intercepts the interior wall of the outlet end. Aeration holes extending substantially perpendicular to the flow of water allows air to be drawn into the water stream producing turbulence and diffusion of the water stream. In one embodiment the last diffusing stage is movably mounted within said bore in such a manner that if its orifices become clogged it can move axially downstream to allow the water to flow around the stage and exit the showerhead.

Abstract: A spray nozzle has an elongate tubular housing through which a gas-borne flow of liquid is ducted to a discharge opening that is formed in an end wall of the housing. The discharge opening is defined by the juncture of a transversely-extending, substantially linear groove which is formed in the external face of the end wall, and a converging passage which is formed in the internal face of the end wall. The converging passage and the linear groove cooperate to provide an essentially convergent-divergent discharge opening which tends to cause materials being discharged to form an elongate discharge spray pattern that is relatively narrow in width. Materials which discharge from the opening tend to travel in a relatively narrow range of planes that align with the linear groove, and tend to concentrate near opposite end portions of the discharge spray pattern. A deflector sleeve is carried by the housing and is adjustable longitudinally relative to the end wall of the housing.

Abstract: Nozzle for use with a non-aspirated fire-fighting medium capable of a selection of two rates of flow and two modes of spray control.

Abstract: A liquid flow distributor for dispersing wastewater or other liquid carrying stringy solids throughout a particulate media such as in a fluidized bed reactor. The distributor is adapted to allow unimpeded forward flow of the liquid into the media and it also functions to minimize backflow of the media into the distributor should forward flow be arrested. The distributor includes an array of like nozzles, each having an inlet port leading into a conical flow expansion section whose cone angle is such that the nozzle capable of flowing full without significance turbulence, the mouth of the flow expansion section merging with a cylindrical outlet section whose dimensions are such that any backflow which takes place when forward flow is arrested will normally be insufficient to lift the bed particles into the nozzle.

Abstract: An ice product is disclosed having improved liquid displacement characteristics and which is of a configuration which provides for splash resistance and resistance to bridging between adjacently stored products. The apparatus and method for producing the improved ice product is disclosed in the form of an ice making machine having one or more combination evaporator and ice form assemblies, each of the assemblies being provided with a plurality of pockets or recesses in which the ice product is formed during a freezing or refrigeration cycle, the ice products being subsequently discharged to an associated storage area during a subsequent harvest cycle.

Abstract: A water-saving shower head of the aerating type providing water in air-borne atomized form in a normal, continuously expanding pattern substantially homogeneous in cross-section as to water concentration or "wetness" with means for adjusting the rate of flare of the pattern to increase the concentration of water or "wetness" for rinsing purposes, especially for better removal of shampoo from the hair. The adjustment is accomplished by manually adjusting the position of the transverse orificed nozzle plate along the axis of the outlet passageway of the shower head, the longer the passageway, within limits, the more concentrated the shower pattern.

Abstract: A shower head comprising a first part adapted to be connected to a source of water and a second part mounted on the first part for pivotal movement about a transverse axis. The second part has an opening adapted to be aligned with an opening in the first part. The opening in the second part has a venturi-shaped portion. A third part is telescoped over and surrounds the second part and defines a pressure chamber into which water is directed from the venturi. The third part has a plurality of openings therein and a passage extends from the restricted portion of the venturi to the exterior for attachment to a fluid dispenser.

Abstract: A sonic atomizing spray nozzle (40) wherein a slurry (30) of finely-divided sulfur oxide absorbent particles in a carrier liquid is sprayed into a flue gas stream (12) entering a drying chamber (20) through a continuous circumferential slit (70) as a radially outwardly directed thin continuous sheet (28). The thickness of the sheet can be varied to optimize atomization over a range of slurry flow rates by varying the width of slit (70).

Abstract: An apparatus is provided for forming CO.sub.2 snow and includes a CO.sub.2 line having an outlet end and an inlet end adapted for communication with a source of liquid CO.sub.2 under pressure. A snow forming head is provided and comprises a generally horizontal elongated laterally and downwardly opening channel member and a CO.sub.2 discharge conduit is disposed in and extends along the channel member. The conduit includes opposite side small diameter outlet openings formed therein and spaced longitudinally therealong opening outwardly toward and spaced inward of the opposing sides of the channel member. One end of the conduit is closed and the outlet end of the CO.sub.2 line is sealingly communicated with the other end of the conduit. At least the portion of the conduit having the small diameter outlet openings formed therein is of a greater internal cross-sectional area than the CO.sub.2 line whereby movement of liquid CO.sub.

Abstract: A spraying device is described comprising a nozzle formed with an outlet orifice through which the fluid issues in the form of a jet, and a cup-shaped member having a thin wall defining an open end of slightly larger diameter than the outlet orifice. The cup-shaped member is floatingly mounted for lateral and axial movement with respect to the nozzle orifice such that the jet issuing therefrom always impinges the cup-shaped member within its open end. The device further includes limiting means limiting the floating movement of the cup-shaped member.

Abstract: A fire hydrant diffuser comprising a flared housing rectangular in cross section having disposed therein a pair of water diffusing members in opposed relation angled to form a V-configuration and having a stepped mesh structure positioned relative to the direction of flow of water to present narrow obstructing slits for the passage of the water.

Abstract: A method and apparatus are disclosed for the spraycoating of the interior of a hollow body, one region of which, e.g. a seam, must receive a heavier coating than the remainder of the surface to be sprayed. A single spray coating operation is performed, in which a relatively heavy spray jet is concentrated on the seam and a relatively thin cloud of coating material is used to coat the entire interior surface of the body. Preferably, a cloud of electrostatically charged coating material is formed by an atomizer fed by a feed conduit from which a certain amount of coating material is diverted to be formed into the relatively highly concentrated spray jet directed at the seam. The relatively high-velocity particles of material of the spray jet which is concentrated onto the seam and the relatively low-velocity particles of material of the coating cloud together produce on the seam a thinner layer of material than would normally suffice and which, nonetheless, adheres well.

Abstract: A hollow tubular handle is connected at one end to a pressurized water supply and carries a sprinkler head at its other end. A brush attached to the sprinkler head is formed with a hole through which water from sprinkler head passes without contact with the brush. A tubular member extends from the sprinkler head partially through the hole in the brush to prevent the bristles of the brush from being bent into the flow from the sprinkler head when the brush is pressed against a surface to be washed such as an automobile body.

Abstract: The invention relates to a spray system for a multi-ingredient ablative material wherein a nozzle A is utilized for suppressing overspray. The nozzle includes a cylindrical inlet (12) which converges at (12a) to a restricted throat (13). A curved juncture (15) between cylidrical inlet (12) and convergent portion (12c) having a predetermined radius of curvature affords unrestricted and uninterrupted flow of the ablative material. A divergent bell-shaped chamber (14) and adjustable nozzle exit B is utilized which provides a highly effective spray pattern in suppressing overspray to an acceptable level and producing a homogeneous jet of material that adheres well to the substrate.

Abstract: A sprinkler is described comprising a nozzle formed with an axial bore having an outlet through which the liquid exits in the form of a jet, a spindle extending through the bore and having a smaller outer diameter than the diameter of the bore so as to be laterally movable within the bore, and a deflector mounted on the spindle and having a recess facing, and slightly larger than, the outlet end of the nozzle bore so as to be impinged by the jet issuing from the nozzle thereby to impart rapid lateral movements to the spindle. The deflector is eccentrically mounted on the spindle, and the recess is formed eccentrically of the deflector, such that the impacts of the spindle against the sides of the bore by its lateral movement within the bore impart a rotary movement to the deflector.

Abstract: A spray nozzle is disclosed which can be attached transversely to a conduit wall for distributing liquid passing through the conduit. The nozzle is attached through an orifice in the wall and includes a body and a deflector attachable to each other. The body includes a bottom, a head, an axial passage, a liquid inlet adjacent the bottom and a jet adjacent the head, such that the nozzle is attached to the conduit by penetrating a nipple at the bottom of the body through the conduit wall. An inlet orifice prevents undesirably large sized objects from entering the passage. When the nozzle is inserted into the conduit an annylar groove positioned above the nozzle piercing nipple serves to securely retain the nozzle on the wall.

Abstract: An automatic pressure responsive shower head includes an outer housing and a body member positioned within the housing and attached thereto. The body member has a water discharge at one end and is connected to a swivel member at the other end. There are water passage means within the body member between the swivel member and the body member water discharge. A water pressure responsive control member is positioned within the body member and is effective to control the flow of water through the body member water passage.

Abstract: An adapter to be fitted over the orifice of a nozzle the configuration of whose output it is desired to modify has a central bore aligned with the orifice of the nozzle. A shallow recess is provided in the output end of the adapter surrounding the orifice of its bore. The perimeter of the recess has the shape to be imparted to the nozzle output.

Abstract: A gas heating appliance of the kind having a gripping handle through which fuel is supplied to a common feed pipe carrying a plurality of burners. Each burner has a separate nozzle branched off the feed pipe and a pair of opposing curved baffle walls are provided at each nozzle, the walls of each pair being separated by gaps at each nozzle, all the gaps being in mutual alignment. The appliance of the invention is particularly applicable to the heating of plastic foil type materials.