Abstract:
A nozzle for atomizing a liquid includes at least one Venturi tube. A Venturi tube defines a liquid flow path and has an entrance cone, an intermediate throat of diameter d.sub.n, and an exit cone having a length along the flow path to an exit port of at least about 2d.sub.n. The exit cone also has an angle of divergence that varies from 0.degree. at the throat to about 6.degree. at the exit port. As liquid with an entrained gas, preferably constituting about 10.sup.-2 to about 10.sup.-3 fractions, passes through the throat in a Venturi tube with a Reynold's number greater than about 2300, the liquid static pressure reduces and the entrained gas forms cavities that grow as the liquid passes through the exit cone. The nozzle is substantially free of any structure that could disturb the flow in the nozzle sufficiently to allow the static pressure on the liquid to rise significantly in the nozzle. When the liquid emerges from the nozzle, the liquid static pressure rises and causes the gas cavities to collapse in a zone of collapse and to produce forces that are sufficient to atomize the liquid and to break atomic, molecular and crystalline bonds in the liquid.
Abstract:
A nozzle for use with an adhesive spray apparatus includes a nozzle having an extended tip and an air cap having a diverging air passage terminating at an outlet concentric about the tip end. An adhesive outlet at the tip end is extended beyond the air outlet. Channels for swirling the air in the cap about the nozzle are provided in the cap around the nozzle. Highly viscous adhesives are sprayed in a uniform pattern without adhesive accumulation on the nozzle and disruption of pattern.
Abstract:
A nozzle for a hot melt adhesive spray head which mounts directly to a nozzle mounting surface. To permit a series of spray nozzles to be mounted closely together, the nozzle has a threaded stud integral with and extending from the rear side of the nozzle. The adhesive passage in the nozzle mounting surface has a threaded bore for receiving the threaded stud of the nozzle. The nozzle includes a first O-ring seal to prevent the pressurized pattern air from leaking between the nozzle and the nozzle mounting surface. A second O-ring seal isolates the hot melt adhesive from the pressurized patten air at the interface between the nozzle and the nozzle mounting surface.
Abstract:
In a manually operable discharging apparatus, the discharge nozzle has an at least two-stage atomizer, in which the medium flow, following pre-atomization, is atomized by surge-like acceleration with a whirled, fine compressed air flow, e.g. according to the Laval, effect, so that even finer droplets are obtained. For this purpose to the discharge nozzle, a separate compressed air channel portion upstream of the end opening supplies compressed air from a time immediately before the supply of medium to a time after its supply. The compressed air can be produced in simple manner by a compressed air pump combined constructionally with the medium pump and operable together therewith by means of a single handle and which in the extension of medium pump is provided immediately adjacent to its outer end and whose pump cylinder is formed by the cap-like handle. The compressed air flow can also be passed to other points of the discharging apparatus, e.g. for cleaning the medium outlet channel for discharge nozzle and can be used for control functions for valves, particularly outlet valves.
Abstract:
A method for forming a substantially continuous filament of a thermoplastic work material and for imparting a swirling motion thereto comprises a body member which has a work material supply passage and a gas supply passage formed therein. An outlet nozzle section connects to the body member and has a substantially conically tapered shape. The nozzle section has a nozzle extrusion passage formed therein in communication with the work material supply passage. A housing member operably connects to the body member to delimit a substantially annular gas transfer zone in fluid communication with the gas supply passage and to delimit a substantially annular gas outlet passage around the nozzle section. The housing member includes an exit section having inner wall surfaces which substantially parallel the conically tapered shape of the nozzle section. The inner wall surfaces are in a selected spaced relation from the nozzle section to define the gas outlet passage. The housing exit section and the nozzle section are configured to provide for a selected gas flow which imparts the filament swirling motion substantially without disintegrating the filament.
Abstract:
When the container is compressed, liquid flows via a riser (2) and an inflow channel (10) tangentially into a vortex chamber (9), where a rotary flow is induced. The liquid is accelerated by the conical cross-section of the inner wall (5) of the liquid nozzle (1) until it is discharged from the orifice (7) of the liquid nozzle (1). At the same time, air from the container flows via an inflow channel (11) into the annular chamber (3) which surrounds the liquid nozzle (1). Coaxial with the liquid nozzle there is a mixture nozzle (4) with a conical inner wall (5'). The orifice (7) of the liquid nozzle (1) is retracted relative to the orifice (8) of the mixture nozzle (4), so that the two media are jointly accelerated after mixing.
Abstract:
Method and device for forming a gellified polyrethane layer on a surface, notably of a mould, by spraying a liquid reaction mixture comprising polyol and isocyanates and which has a viscosity between 20 and 2000 centipoises. The mixture is sprayed in the form of a film of liquid and/or raindrops of which the main part has a mean diameter (Medium Volume Diameter; "M.V.D.") which, according to the standards ASTM E 779-81, is larger than 100 microns and preferably larger than 500 microns.
Abstract:
A device and method for spraying hot melt glue in circular patterns of varying diameters is disclosed. The device uses a single jet of pressurized air caused to spin and forced into a series of passages to produce a conical curtain of air. The conical air curtain impinges upon a stream of hot adhesive to spin and guide it on a surface in a circular pattern. The relative positions of the air and glue emission orifices may be adjusted quickly and easily to provide fine control of the spray pattern diameter while achieving patterns having diameters ranging from approximately one-half to fifteen inches. Spiral glue patterns may be created merely by moving the nozzle of the device relative to a surface in a substantially straight line.
Abstract:
An aerosol fogging generator is disclosed having a prime mover and blower for delivering air through a duct system to a nozzle assembly. A fluid introduction system is provided to introduce fluids into the nozzle assembly for dispersal as a fog into the atmosphere. A passage provided between the fluid introduction system and the duct system provides for a cut off of the fog produced by the generator in a matter of seconds.
Abstract:
A method for producing power by atomizing a stream of molten material by contact with a swirling annular gas stream having an angular to axial velocity ratio sufficient to cause some of the gas to flow in the axially opposite direction from that of the gas stream.