A foam generating and spraying apparatus adapted to receive a quantity of polymeric resin and a foaming agent therefor, and emit the foamed product thereof, comprises a resin conduit having an inlet and an outlet end; a foaming chamber having an inlet and an outlet end being disposed coaxially with respect to the resin conduit; a resin inlet upstream of the resin conduit for admitting a quantity of pressurized polymeric resin thereto; a foaming agent inlet upstream of the foaming chamber for admitting a quantity of pressurized foaming agent thereto; a mixing chamber downstream of both of the resin conduit and foaming chamber; and, a spray member disposed at the outlet end of the resin conduit for establishing a hollow cone spray of resin, and angularly directing that spray against the walls of the mixing chamber. Methods for generating a foamed polymeric resin and the products produced thereby are also disclosed herein.
The invention relates to a mix head for the production of a foamable reaction mixture, preferably one forming polyurethane, from fluid components, said mixing head having a distributor member with several outlets attached to the outlet of the mixing chamber.
Plastic foam is expelled from a slit-shaped nozzle under high enough pressure to break up the plastic foam into generally discrete particles which are propelled toward a surface to be coated with foam at a relatively high velocity. Upon striking the surface, the particles exhibit good adhesion and mechanically key into the substrate upon which they impact. The invention is particularly useful for coating the surface of a landfill for daily sealing of the upper surface thereof.
A foam generating apparatus includes a manifold defined by a rectangular metal block, into which a liquid and surfactant is introduced under very high pressure via a first longitudinally extending passage, and air is introduced via a second longitudinally extending passage parallel to the first passage. The liquid passes through restricted orifices into the narrow ends of a plurality of venturi outlet passages, which are perpendicular to the liquid inlet passage. The velocity of the liquid/surfactant mixture exiting the restricted orifices is maintained sufficiently high to cause flashing to take place to initiate foam generation. Air is injected into the venturi through small diameter ports extending from the second inlet passage to the venturi. The foam and liquid/gas mixture is discharged from the venturis through fittings which may contain vaned inserts for promoting turbulence and thus foaming. Foam production continues in the foam carrying lines downstream of the discharge bushings.
An apparatus and method are disclosed for producing and dispersing herbicidal foam within a sewer line in such a manner as to apply the foam to either the entire interior surface or a specific or a plurality of specific areas within a generally cylindrical line.
A precipitation jet includes a nozzle having an inlet for receiving liquid resin solution, a conical tip, and a plurality of circumferentially spaced apart outlets extending through the nozzle tip for discharging the resin solution. A tubular receiver is disposed coaxially with the nozzle tip and is spaced axially therefrom. The receiver includes a frustoconical impingement surface spaced axially from the nozzle tip to define therewith an annular flow channel having at opposite ends thereof a channel inlet for receiving steam and a channel outlet for discharging an atomized spray of the steam and resin solution for precipitating resin powder from the spray.
