Abstract: A mixing head suitable for mixing two or more liquids is provided. During the mixing process, the liquids are first contacted in a zone of small dimensions in which turbulent mixing occurs and are then discharged into a zone of larger dimensions in which laminar flow is established. The two zones are so designed that there is a single piston operating in both zones and discharging the mixed product. The mixing head can be used to mix a polyol and a polyisocyanate during the formation of polyurethanes.

Abstract: A mixing head essentially comprises a housing with a mixing chamber which has inlet orifices for the individual plastics components and an outlet orifice for the plastics component mixture. In the mixing chamber is located an expulsion plunger of identical cross-section, which plunger is connected to a working piston which can be actuated by a pressure medium, the plunger being movable to and fro between a mixing position, which leaves the inlet orifices open, and a position in the region of the front outlet orifice, in which it seals the inlet orifices from the mixing chamber. The mixing head moreover has a restrictor which can be pushed into and out of the mixing chamber by a pressure medium.

Abstract: A process and apparatus for producing a homogeneous and highly transparent sheet or film from a mixture of a plurality of components which comprises mixing the combined reaction components and depositing the reaction mixture on a molding substrate where the reaction is carried out in a layer thereon, wherein the combined reaction components are mixed, first, in a static mixer and, immediately thereafter, in a dynamic mixer.The invention can be advantageously applied to the manufacture of polyurethane sheets which can be employed in laminated glass sheets.

Abstract: The invention is directed to a process for the production of a flowable reaction mixture from at least two flowable reaction components which comprises conveying said components from storage zones as main flows, metered in a predetermined ratio, to several mixing zones which are connected in parallel, said process further characterized in that the main flows are divided up in each case into a number of divisional flows corresponding to at least the number of mixing zones, which divisional flows are combined with each other in pairs, and the metering ratio of the divisional flows corresponds to the metering ratio of the main flows.

Abstract: A system and method of operating for mixing and dispensing two liquid components, characterized in that each component is chemically stable when maintained in isolation and chemically reactive when combined with the other component. The system includes separate liquid storage containers and pumps for delivering each of the liquids through a common mixing manifold, and from there to a dispensing apparatus, the system including a further pump in one of the containers for delivering liquid through a valved, closed loop subsystem back to the container, the closed loop having therein an entry point for connection to the dispensing apparatus, and the system including a further valve for controlling the flow of the other liquid component to the dispensing apparatus, whereby the conduits leading to the dispensing apparatus may be purged of mixed liquid components, diluted, and returned to the one storage container.

Abstract: A foam generating and distributing manifold device for generating and transporting foam cleansing and sanitizing agents having a manifold chamber with a centrally disposing frothing tube to generate foam which migrates upwardly within the chamber to a plurality of annularly disposed egress ports through which foam is distributed to a series of substantially equidistant supply conduits thereafter migrating to a distribution manifold which distributes the foam evenly upon, for example, conveyor belts used in food processing or the like.

Abstract: A mixing and extruding nozzle for two reactant components has a housing formed with a mixing chamber, a pair of parallel and oppositely directed faces flanking and turned away from the chamber, respective injection passages having inner ends opening into the chamber and outer ends opening at the respective faces, and respective outwardly open grooves in the faces offset from the passages. A valve-type rocker pivotal relative to the housing about an axis perpendicular to and traversing the two faces and offset from the passages and grooves has two like halves each formed with a face confronting the respective housing face and a feed passage opening at the respective rocker face offset from the axis.

Abstract: A system and method of operating for mixing and dispensing two liquid components, characterized in that each component is chemically stable when maintained in isolation and chemically reactive when combined with the other component. The system includes separate liquid storage containers and pumps for delivering each of the liquids through a common mixing manifold, and from there to a dispensing apparatus, the system including a further pump in one of the containers for delivering liquid through a valved, closed loop subsystem back to the container, the closed loop having therein an entry point for connection to the dispensing apparatus, and the system including a further valve for controlling the flow of the other liquid component to the dispensing apparatus, whereby the conduits leading to the dispensing apparatus may be purged of mixed liquid components, diluted, and returned to the one storage container.

Abstract: A mixing head for two reactive components, e.g. the components of a settable synthetic resin mixture, comprises a mixing chamber in which a plunger is shiftable to block and unblock the nozzle orifices and drive the reaction mixture from the chamber through an outlet. At least one of the nozzles is carried on a readily shifting slider which cooperates with a similarly shiftable obturating member to define a small premixing chamber, as desired, and deflect the mixture through at least 90.degree. within the mixing chamber. This system is especially effective for the mixing of reactive components which have hitherto been found to be difficult to mix with conventional mixing heads.

Abstract: A mixing apparatus for multi-component plastics, in particular polyurethane, possesses a mixing chamber (2) with inlet apertures (3) and (4) for the individual plastic components and an outlet aperture (8) for the mixture. In the mixing chamber, a control element (5), which has the same cross-section as the chamber and possesses overflow channels (6) and (7), can be moved to and fro for controlling the component streams. In order to avoid pressure peaks or pressure surges in the transport of the components when the control element passes from the closed position to the mixing position and vice versa, and to provide improved accuracy of metering, the inlet apertures in the inner wall of the mixing chamber, and the corresponding areas of the shell of the control element between its end face (13) and the overflow channels, are matched with one another with regard to their size.

Abstract: A mixing head for two or more reactive components especially anionically polymerizing caprolactam comprises a piston formed with recess means which, at the end turn toward the outlet of the mixing chamber, intercept respective streams of the components which are normally trained upon one another and thus prevent mixing just before the piston blocks the ports through which these streams are directed into the mixing chamber.

Abstract: A mixing chamber for liquids, which are supplied to the mixing chamber in measured quantities one after the other alternating over a period of time, in particular for liquid chromatographs is divided by a fine-pored filter plate (109) into two areas (105, 106). The inlet pipe (111) is connected to one area and the outlet pipe (112) is connected to the other of these areas. The two areas (105, 106) each widen out in a conical shape from the opening of the connected pipe (111) towards the filter plate (109). The filter plate (109) preferably consists of a steel or glass frit with a pore size in the range of 2 to 50 .mu.m.

Abstract: A mixhead for a reaction injection molding machine utilizing at least two liquid components supplied under pressure from a delivery system including a recirculation line. The mixhead comprises a housing having a longitudinal channel through the housing and a ram fit with a close slide fit in the channel. The ram is reciprocable from a first upstream position to a second downstream position. A first inlet port extends through the housing into the channel. A first exit port extends from the channel through the housing upstream from the inlet port and on the opposite side of the channel. At least one other similar inlet and outlet port is provided, each spaced peripherally around the channel from the first inlet and outlet ports. Spaced apart recirculation passages extend through the ram to connect the respective inlet and outlet ports when the ram is in its second downstream position.

Abstract: A mixing head for a high velocity reaction injection apparatus for mixing and dispensing two or more liquid components. The mixing head includes a mixing chamber with two or more inlets for the separate components and an outlet for dispensing the mixed components, and an injection housing for injecting each component through a corresponding inlet. Component flow is directed through a flow accelerating passage in the injection housing prior to injection into the mixing chamber, for imparting a pressure drop in the component on the downstream side of the passage, and means are provided for selectively blocking the inlets for terminating the dispensing of the mixed components and thereby increasing the component pressure in the injection housing downstream of the passage.

Abstract: The present invention relates to an apparatus for the production of a flowable reaction mixture of at least two flowable components which mixture forms a foam or solid material, comprising:(a) storage means for said components;(b) supply lines leading from the storage means via metering pumps to a mixing head;(c) said mixing head having a mixing chamber;(d) injection openings connected to said supply lines and opening into said mixing chamber;(e) said mixing chamber having an outlet opening downstream of said injection openings;(f) said outlet opening having an elastic outlet tube whose throughflow cross section may be varied connected thereto; said apparatus further characterized in that:(g) the outlet tube has at least one means associated therewith for deflecting said outlet tube;(h) an ejection piston is associated with said outlet tube, which piston is capable of filling the outlet tube; the contour of the inside wall of said outlet tube corresponding to the external contour of said ejection piston.

Abstract: Apparatus for high pressure impingement mixing includes a mixing chamber and aftermixer chamber located on opposite sides of, and perpendicular to, a transfer dispense chamber. Two or more reactive components are injected into the mixing chamber. The resultant mixture is directed across the transfer dispense chamber into the aftermixer chamber, and from the aftermixer chamber back into the transfer dispense chamber and around the crossing mixture to the outlet of the transfer dispense mixer for dispensing. Each chamber includes a plunger which is actuated sequentially to interrupt mixing and clean the respective chamber. The device provides effective and intimate mixing of the reactive components and dispenses a stable emulsion so that the device can be used in applications presently suitable only for low pressure mixing devices. It may also be used in existing high pressure applications but without the need for conventional aftermixer devices and gating systems disposed in the forming molds.

Abstract: A mixing apparatus includes a dwell chamber located between two mixing heads. An elongate, reverse-twist auger is provided within the dwell chamber. Valves are provided to permit washing the mixing apparatus and a dispensing valve includes the capability of directing product to a discard container.

Abstract: Disclosed is a high-pressure mixing head for the mixing of at least two reactive plastics material components and the foaming of these components, the mixing head comprising a mixing chamber (18) which has opening thereinto nozzle orifices (22; 24; 41) associated with said plastics material components and a blowing agent, and in which a metering plunger (20) is mounted for reciprocating movement. The mixing chamber (18) opens into a discharge section (16) of greater dimensions which, thus, acts as a stabilizing zone. On the mixing chamber outlet (26), a variable damper element (purging plunger 12; damping plunger 40) is provided which provides for variable restriction of the mixing chamber outlet (26). The damper element greatly reduces the mixing turbulence within the mixing chamber, such that, in combination with the discharge section of greater dimensions, the plastic foam mixture flows out from the mixing head so smoothly that spatter-free foaming even in open molds becomes possible.

Abstract: A reinforced hardened foam lining may be constructed in a particular zone of a well such as a water well, a geothermal well, or an oil well to plug off or contain salt water intrusion or lost circulation by placing a length of perforated pipe in the desired location; placing foam generating components in a foam generating device in the length of perforated pipe; mixing the resin and catalyst (components) forming a mixture of components under pressure which fills the length of perforated pipe, flows through the perforations and fills the voids between the pipe and the side wall of the hole, then swells forming a foam and hardens. The area inside the length of perforated pipe may then be drilled out providing a strong reinforced channel.

Abstract: Described herein is an apparatus for producing a mixture of chemical components which comprises an elongated housing containing (a) a tube extending therethrough having at least one inlet means for supplying at least one component into said tube whereby said components flow from said inlet means to outlet means at the other end of said tube; (b) inlet means for supplying at least one component either reactive with one or more components of (a) or catalyzing the reaction of two or more components of (a), said inlet means in communication with an annular groove within a conical member which receives said component(s), (c) means for distributing said component(s) from the annular groove to a plurality of grooves in said conical member, said grooves directing the component(s) into the flow of the component(s) of (a) in said tube.

Abstract: Apparatus for the discontinuous production of articles from a foamed plastic, including metering vessels for reaction components arranged above a mixing vessel. The metering vessels are with the interposition of communication bellows connected to the mixing vessel. Inside the cover of the mixing vessel exists an annular space communicating with an annular slot which opens towards the internal wall of the mixing vessel, so that when filling the mixing vessel first one of the reaction components is introduced into the annular space, flowing along the inner wall of the mixing vessel downwardly through the annular slot and in this way flushes off any residue.

Abstract: A membrane of fiberglass-reinforced polyester resin is used as a traffica cover over a compacted backfilled crater and crushed stone base to impart strength to the repair and prevent foreign object damage to aircraft. The membrane cover is usually prefabricated from several fiberglass matting layers of chopped fiberglass strands chemically bonded to woven fiberglass roving and impregnated with a polyester resin; an anchoring system consisting of holes along the cover perimeter and torque set rock bolts are used in conjunction with special steel bushings to secure the cover to airfield pavement surrounding the crater.

Abstract: Progammable computer controlled reaction injection mixing of selectively variable reactive fluid polymerizable components is disclosed, embodying an improved reactive injection mixing head construction which facilitates rapid changes in mix formulations between successive pour or molding operations in a continuing succession of such operations, while maintaining consistently uniform results in the finished products.

Abstract: The invention relates to a method and a device for producing a reaction mixture from flowable foam-forming or solid-forming components (preferably polyurethane forming components) which are conveyed continuously and are mixed together or are circulated. The quantity to be conveyed is preselected. The injection pressure is preselected and the circulatory pressure is measured for each component. The predetermined quantity and pressure to be conveyed as well as the measured value are preferably fed into a control computer during the circulation and the mixing process and are compared with actual values. Cavities are filled out with the reaction mixture produced and, in particular, molded articles are produced in molds.

Abstract: A system for producing foam continuously. A body member defines a foam generating chamber. A foamable liquid is introduced into an inlet of the foam generating chamber. A gas is simultaneously introduced under pressure into the inlet of the foam generating chamber to form a mixture of foamable liquid and gas. The mixture is then flowed from the inlet of the foam generating chamber to an outlet thereof through a turbulator medium which substantially fills the foam generating chamber to thereby foam, mix and homogenize the mixture. The inlet and outlet of the foam generating chamber are in an imaginary substantially non-horizontal plane. The foamed and homogenized mixture is then removed from the outlet.

Abstract: Hydraulically coupled injection nozzles (5,28) and return nozzles (15,38) are used in an apparatus for producing a reaction mixture of fluid components forming foam or a solid material. These nozzles (5,15,28,38) comprise control pins (11,20,34,43) which are designed to be inserted into the openings (6,17,29,40) of the nozzles (5,15,28,38). The ratio between the distances which the control pins (11,20,34,43) travel outside and inside the orifices (6,17,29,40) is adjusted in such a way that, when the nozzles (5,15,28,38) are switched from "mixing" to "circulation" or vice versa, there is a time interval during which all the nozzles (5,15,28,38) are closed.

Abstract: A mixing head for mutually reactive components, e.g. of a synthetic resin to be injected into a mold cavity, comprisess a control member which is shiftable in a mixing chamber opening into the mold cavity between a position in which mixing of the components can occur in this chamber and a position in which the member expels the mixture from the chamber and provides recirculating passages for the two components. A displacement body can be inserted into the chamber to control the mixing action by a fluid-operated actuator hydraulically coupled to a fluid displacement member shifted by the control member.

Abstract: The invention relates to a method and a device for producing a solid-forming or foam-forming flowable reaction mixture by metered injection of flowable reaction components into a mixing zone from which the finished reaction mixture is discharged.

Abstract: A process and apparatus are provided for making desired shapes of urea-formaldehyde suitable for use as insulation from urea-formaldehyde foam. Fluid urea-formaldehyde foam (A) is formed into discrete particles (A') in particle generator (10) which also partially cures particles (A'). After particles (A') are fully cured, they are blended with fluid urea-formaldehyde foam in mixing apparatus (11) which includes blending head (66) to produce mixture (C) which is a coherent mass. Mixture (C) is molded to the desired cross-sectional shape by molding conveyor (12). Cutter (132) cuts formed mixture (C) into the desired length. Thereafter oven (146) is utilized for fully curing the product which is then enclosed in a suitable packaging material.

Abstract: The device comprises a plurality of superimposable elements, in each of which there are formed cavities and holes arranged to originate channels for conveying the components, the said channels being disposed so as to originate a plurality of channel assemblies disposed in series to each other, each assembly comprising a first central channel, second channels with axes are substantially orthogonal to the axis of the said first channel, which second channels communicate with this latter and are disposed radially with respect to it, third channels, each of which has its axis parallel to that of the said first channel and originates from a corresponding second channel, and fourth channels whose axes are substantially orthogonal to the axis of the said first channels and which are disposed radially with respect to it.

Abstract: To mix two or more fluid plastic components, which react with one another, intimately and abruptly, the components are injected under high pressure and at high velocity into a mixing chamber. To provide greater control of the type of mixing, i.e. to allow control of the spread of the jet and/or the jet volume and the jet energy losses, the components are guided so that they impinge on one another at an angle, preferably an angle which can be varied. To achieve this, and in particular to allow the point of impingement of the jets to be varied, the injection nozzles can be slid or pivoted at right angles to the lengthwise axis of the mixing chamber, and may also be adjustable in the direction of the said axis, and in respect of their distance from the axis.

Abstract: An apparatus for the continuous production of a curable polyurethane froth which apparatus comprises separate sources of a polyol, an isocyanate, a catalyst and an inert gas, means including separate conduits for feeding said polyol, isocyanate and inert gas separately and under pressure at controlled flow rates from said sources to a mixing device containing inlet openings to receive said polyol, isocyanate and inert gas, means for mixing said polyol, isocyanate and inert gas to produce a froth, and an outlet opening for the resulting froth, means for delivering the froth from said mixing device to a second mixing device, a conduit for feeding the catalyst under pressure at a controlled flow rate to the second mixing device, and means for mixing the froth and catalyst, said mixing device containing inlet openings to receive the froth and catalyst and an outlet opening for the resulting catalyzed froth and means for delivering the catalyzed froth from the mixing device onto a substrate.

Abstract: The invention relates to a method of filling cavities and, in particular, mold cavities, with a reactive solid-forming or foam-forming mixture, wherein at least two reactants are introduced into a spatially limited mixing zone, mixed therein as they pass through, and the mixture produced is introduced into a mold cavity where it reacts and wherein the mold cavity is initially enlarged in-part for storing a portion of the mixture, which portion is subsequently transferred to the final mold cavity volume. The object of the invention is to produce plastic articles which are shaped in molds, but also to fill out other cavities, for example, for the purposes of reinforcement.

Abstract: The instant invention is directed to a method of producing a reaction mixture for forming solid or cellular materials from flowable reactants and, optionally, fillers, comprising premixing the components and, optionally, fillers in a first mixing zone and after-mixing in a second mixing zone, the improvement wherein said after-mixing is carried out in a slit-like annular zone which extends radially from the center, the surface boundaries of said annular zone are not parallel and one of said surface boundaries is rotated while the opposite facing surface boundary remains stationary.

Abstract: A continuous process for the production of flame-resistant foamed plastics material by condensation of aqueous aminoplast precondensates with diisocyanates or polyisocyanates, wherein, in a first mixing stage, the isocyanate is mixed with 4 to 14% by weight of catalyst, the catalyst being an organic amine and/or an organic metal compound, at temperatures of 40.degree. to 130.degree. C., with a residence time of 1 to 8 seconds, and directly thereafter, in a second mixing stage, the aminoplast precondensate and, simultaneously but separately from the aminoplast, an acid curing catalyst are introduced, after which the foamable mixture thereby produced is discharged continuously.

Abstract: A method and apparatus for incorporating particulate material in reactive resin mixes produced by the RIM method in the molding of foamed or unfoamed plastic articles, wherein the particulate material is introduced into the resin mix in a manner which substantially eliminates the severe abrasive effect such particulate material produces under conditions existing in prior methods due to flow through the various passages of the mixing head. The particulate material may constitute reinforcement for a plastic article, in which case short lengths of glass, carbon, graphite or other mineral or metal fibers and the like may be used. Alternatively, granular particulates such as carbon black, metal or mineral oxides, pigments, etc. may be incorporated for coloring the product, or increasing its resistance to actinic rays, or for imparting increased rigidity to the molded product, etc.

Abstract: The invention disclosed herein is concerned with a process for mixing a plurality of viscous rapidly reacting, fluid materials and an apparatus with which to perform this process. In this process the fluid materials are initially introduced into a mixing chamber and mixed with a gas, preferably in such a way that an angular momentum is imparted to the mixture. The mixture is then fed into a static mixer which has a short residence time spectrum. The apparatus comprises a cylindrical mixing chamber with a gas inlet and at least one nongaseous fluid material inlet arranged to direct flow tangentially to the interior surface of the mixing chamber. Other inlets may be provided downstream of these initial inlets but before a static mixer with which said mixing chamber communicates. An outlet is provided downstream of said static mixer which preferably has intersecting baffle plates, a low pressure loss and a short residence time spectrum.

Abstract: Pressure vessels are disclosed for containing a foamable mixture of liquid and a blowing agent for incrementally or continuously dispensing a foam of constant foam-volume ratio. Liquid compositions having coating or polymeric solids are capable of being foamed and dispensed with the apparatus. The method and apparatus are especially advantageous in dispensing foamed coatings, paints or adhesives with superior control.

Abstract: The invention relates to an apparatus for producing a reaction mixture containing a filler from at least two components which are capable of flowing, and in particular for producing polyurethane. The filler is added to the reaction mixture dry in the form of powder, fine particles or fibers.

Abstract: A multiple component applicator system for simultaneously metering a plurality of flowable materials and for delivering the metered quantities in predetermined proportions to a mixing device wherein the flowable materials are mixed and then dispensed. The system includes an improved metering and proportioning device as well as an improved modular control system for facilitating rapid interchangeability of the flowable materials being dispensed from the apparatus.

Abstract: An apparatus is provided for the mixing of a first liquid foaming agent component with compressed air in a mixing chamber to produce a foam. A nozzle for ejecting a second liquid component into the foam is provided downstream of the mixing chamber. The mixing chamber is attached to the downstream side of a valve housing. The valve housing includes a triple plug valve for simultaneously selectively connecting and disconnecting a first liquid component inlet and an air inlet with the mixing chamber and a second liquid component inlet with the nozzle. First port means, connecting the air inlet downstream of the triple plug valve, to a plurality of air ejection orifices communicating with the mixing chamber is provided within the valve housing. Air control valve means is provided within said first port means for controlling the amount of air flowing to said mixing chamber.

Abstract: The invention is directed to a device for the discontinuous production of block foam comprising a mixing unit, a means for moving the unit approximately vertically into and/or out of a mold with the unit having reaction component feed lines, a stirring means, and a mixing container having a plate with feed openings for the reaction components characterized in that(A) a distributing device is arranged below the feed opening for one of the components and(B) the mixing container comprises a bottomless cylindrical shell, the lower rim of which can be placed on the bottom of the mold.

Abstract: 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.

Abstract: A system and method is disclosed for continuously producing and dispensing foam material including storage containers with respective delivery lines for delivering, via separate motor driven pumps, a foaming agent solution and curable synthetic resinous material to a mixing gun. An air compressor supplies compressed air which is first heated and then directed to the mixing gun wherein the components are mixed in the proper proportions to produce and dispense foam to the point of placement. The system includes an electric motor which conjointly drives the separate pumps which supply the constituent materials to the mixing gun under predetermined constant pressures and continuous flow conditions so as to produce a homogeneous and continuous foam product of desired density generally free of streaks and inconsistencies.

Abstract: The instant invention relates to a process and an apparatus for the production of a foamable mixture from at least two fluid, foam forming reactants and aggregates, in which the aggregate is added to one of the reactants and the resulting preliminary mixture is then mixed with the other reactant.

Abstract: A mixing head for a high velocity reaction injection apparatus for mixing and dispensing two or more liquid components. The mixing head includes a mixing chamber with two or more inlets for the separate components and an outlet for dispensing the mixed components, and an injection housing for injecting each component through a corresponding inlet. Component flow is directed through a flow accelerating passage in the injection housing prior to injection into the mixing chamber, for imparting a pressure drop in the component on the downstream side of the passage, and means are provided for selectively blocking the inlets for terminating the dispensing of the mixed components and thereby increasing the component pressure in the injection housing downstream of the passage.

Abstract: A mixing head, specially for chemically reactive fluid components, such as two reactive liquids adapted to form a synthetic resin, has a central body which is provided with passages enabling recirculation of the individual components in one position of the mixing head and discharge of the mixture in another position. The wall of the housing in which the central body is movable is elastically deformable to effect sealing.

Abstract: A foaming device including a housing with a cylindrical passage therethrough and four housing ports which provide communication between exterior and interior of the housing, the housing ports being connected to sources of fluids; a cylindrical spool slidably disposed within the housing provided with an axial passage therethrough and three spool ports in communication with the spool passage; the spool being displaceable to on, off and cleaning positions in a way that one has to go through the cleaning position when displacing the spool from the on to off position or vice versa.

Abstract: 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.

Abstract: Apparatus for making foam from water, air and surfactant produces very small bubble foam by discharging the ingredients for the foam through passages that cause the stream of ingredients to be alternately expanded and contracted as by travel along tortuous passages to generate the foam. The foam may be delivered to pipes of relatively large diameter to a place of use, particularly for dust suppression. A more uniform flow of foam is obtained as compared with foamers of the prior art where the foam sometimes broke up into alternating slugs of foam and air when discharged from pipes of large enough diameter to cause the foam to travel at low velocity.