An apparatus for feeding and metering fluid components to a high pressure mixing head

Method and apparatus for feeding a polyurethane mixture into hollow bodies

A method and apparatus for feeding a polyurethane mixture suitable to form a thermally insulating layer inside hollow bodies, such as hollow walls of a refrigerator cabinet, freezer, display counter or insulating panel. A polyurethane mixture resulting from chemically reactive components, supplied by a high-pressure mixing device, is injected into a cavity of a hollow body extending in a horizontal plain. The mixture is injected at a first flow-rate and a first injection speed, to be poured into a first deposition zone farthest from the injection point. Subsequently, the flow-rate and the injection speed of the polyurethane mixture are gradually reduced in a controlled manner, to be poured in successive deposition zones towards the injection point of the polyurethane mixture, along a distribution strip, allowing the injected mixture to spread out throughout the cavity of the hollow body along isometric expansion lines.

METHOD AND HIGH-PRESSURE MIXING DEVICE FOR FILLED POLYURETHANE RESINS

A method and device for high-pressure mixing of polyurethane components, in which one of the polyurethane components is pre-mixed with a filler material and/or with an additive. The device comprises a mixing chamber into which first and second polyurethane components are radially injected, and a slide valve which moves between a fore or closure position and a rear or opening position of the mixing chamber. The slide valve at its fore end is provided with a feeding chamber for a third polyurethane component pre-mixed with the filler material and/or additive, and an outlet hole; a cleaning pin for the outlet hole slides into a longitudinal guide hole of the slide valve.

Mixing method and apparatus for preparing multi-component plastic materials, especially polyurethanes

High-pressure mixing method and apparatus, with a self-lubricating and scraping device

The high-pressure mixing apparatus, for reactive chemical components, comprises a device for self-lubricating and scraping the outlet duct of the chemical mixture, and flushing out the scraped residues. The self-lubricating and scraping device comprises a delivery chamber for the lubricant material axially aligned and in fluid communication with the outlet duct; the lubricant delivery chamber is connected to a storage tank by a feeding and re-circulation circuit. The lubricant is sucked into the outlet duct and subsequently returned into the delivery chamber by a cleaning member in the form of a pumping piston sliding into the outlet duct, the pumping piston being provided with scraping rings for removing the reacted mixture adhered to the inner surface of the outlet duct.

MIXING METHOD AND APPARATUS FOR PREPARING MULTI-COMPONENT PLASTIC MATERIALS, ESPECIALLY POLYURETHANES

METHOD AND HIGH-PRESSURE MIXING APPARATUS WITH SELF-REGENERATING SEAL

A method for forming a self-regenerating seal in a mixing chamber of a high-pressure mixing apparatus for polymeric components suitable for providing a reactive mixture for a polymerisable resin. An annular sealing element is provided in a circular housing seat inside the mixing chamber, in a sealing zone downstream the injection holes for the polymeric components; worn and/or torn parts of the annular sealing element are automatically regenerated by the same reactive mixture delivered during operation of the mixing apparatus. A high-pressure mixing apparatus with self-regenerating sealing element is also claimed. 1. A method for forming a self-regenerating seal into a mixing chamber of a high pressure mixing apparatus , comprising the steps of:feeding a first and at least a second polymeric component to the mixing chamber through injection holes, to form a reactive polymeric mixture, to be dispensed by a delivery conduit, in which a slidable valve member is reciprocable in the mixing chamber between a retracted position, and an advanced position to open and respectively to close the injection holes and the mixing chamber in respect to the delivery conduit;providing at least one circular seat for housing an annular sealing element on an inner surface of the mixing chamber in a sealing zone downstream of the injection holes;providing an annular sealing element in said at least one housing seat by a polymerisable resin; and{'b': '36', 'automatically regenerating worn and/or torn parts () of the annular sealing element, by allowing the reactive mixture to fill up and polymerize into the worn and/or torn parts of the sealing element, inside the housing seat.'}2. The method for forming a self-regenerating seal according to claim 1 , initially forming said annular sealing element by filling the housing seat claim 1 , by the same polymeric mixture.3. The method for forming a self-regenerating seal according to claim 1 , forming the annular sealing element by spreading a ...

Seal gasket element for a mixing apparatus, method for obtaining and applying the same, and special equipment for fitting the same

A method for obtaining and applying a sealing gasket element on a slide-valve sliding in a cavity of an apparatus for the recirculation and mixing of chemically reactive polymeric components, comprises the steps of: obtaining from an elastic-plastic material a precursor element of the seal element, with a grid structure having a reticular shape; positioning the precursor element around the slide-valve; exerting on the precursor element, through temporary clamping elements, a radial compression and contraction action to insert it and couple it to one or more housing seats provided on the slide-valve so as to obtain the seal element well coupled to the latter; progressively removing the clamping elements to sequentially release successive parts of the gasket element and gradually free the slide-valve to gradually introduce the parts of the slide-valve—freed in succession—in the housing cavity allowing the sealing gasket element to gradually expand radially due to the elastic return by adhering ...

SELF-CLEANING HIGH-PRESSURE MIXING APPARATUS FOR COMPOSITE MATERIAL

A high-pressure mixing apparatus suitable for producing a composite material from a reactive mixture of at least a first and a second chemical components and from a filler material, including a main body conformed with a discharge duct for the composite material, a high-pressure mixing chamber for the chemical components, and a first cleaning member axially displaceable between a forward position and a rearward position within the discharge duct. 1. A high-pressure mixing apparatus , suitable for producing and discharging a composite material resulting from a reactive mixture of at least a first and a second chemical components and from a filler material , said apparatus comprising:a main body, conformed with a discharge duct for the composite material, said discharge duct having a peripheral wall extending between a rear end and a fore end;at least one high-pressure mixing chamber for the chemical components, said mixing chamber having an exit port connectable to the rear end of said discharge duct;a first cleaning member axially displaceable between a forward position and a rearward position within the discharge duct, said first cleaning member being conformed with a through hole defining a feeding channel for the filler material, said feeding channel extending along a longitudinal axis between a rear end and a fore end of the first cleaning member;wherein:said mixing chamber is connectable to the rear end of the discharge duct via an annular distribution chamber for the reactive mixture, said discharge duct having on the rear end an annular surface;said annular distribution chamber extending coaxially to said discharge duct, and having a constant cross-section area arranged for homogeneously distributing circumferentially the reactive mixture into said discharge duct,a second tubular cleaning member for the annular distribution chamber, coaxially arranged around the first cleaning member and having a respective annular surface facing the annular surface of the ...

Apparatus for dispersing a gas, for example carbon dioxide, in at least one reactive resin

The invention concerns an apparatus (1) for the dispersion of an expansion gas even in supercritical conditions, e.g. carbon dioxide, in a reactive resin, of the kind in which a reaction chamber having an input (27) for gas and an input (37) for resin is provided. Advantageously, the chamber is a dispersion and containment chamber made into a casing (2) of predetermined high resistance susceptible to sustain high pressure and is divided into two sections (6,7) by a head (14) of a dispersion and mixing cylinder-piston group (4) in fluid communication between themselves by means of at least one pouring passage (31, 36, 32, 39) provided with a static mixer (38), motor means (3) being provided for piston (34) control of said mixing cylinder-piston group (4). The invention also concerns a process for the formation of a polyurethane foam starting with the dispersion of carbon dioxide, even supercritical, in a reactive resin in which at least one initial dispersion and mixing controlled phase ...

Co-injection mixing method and apparatus

A method and device ( 10 ) for mixing polyurethane-forming liquid chemical components for the production of polyurethane foams, in which positive use is made of the turbulency and swirling action caused by the injection of pressurized jets of chemical components, in order to provide a methodology tending to improve the mixing processes by impingement and by the turbulency induced by a pressure drop in conventional self-cleaning apparatuses.

Apparatus for the production of polyurethane material with a cleaning member having a filler feeding channel and an inclined front surface

A process and an apparatus for the production of a polyurethane mixture is described. The apparatus comprises a high-pressure mixing device provided with a mixing chamber opening onto a side of a discharge duct.An elongated cleaning member is reciprocable inside the duct and is provided with a longitudinal channel for feeding a fluidized reinforcing material, for example reinforcing fibers or a reinforcing material in powder or granulate form, to be blended with the polyurethane mixture flowing into the discharge duct. The feeding channel for the reinforcing material terminates at the front end of the cleaning member, at a point where the flow of reinforcing material impinges the polyurethane mixture which emerges from the mixing chamber under high turbulence conditions. Blowing nozzles are provided to generate air jets for repeatedly deviating the flow of blended polyurethane mixture and reinforcing material flowing out from the discharge duct.

METHOD AND APPARATUS WITH LOBED NOZZLES, FOR MIXING REACTIVE CHEMICAL COMPONENTS

A method and an apparatus for high-pressure mixing of reactive chemical components. The chemical components are fed into a mixing chamber, by respective injectors at least one of which comprises a nozzle and a plug member for controlling the pressure drop; the nozzle and/or the plug member are shaped to form a lobed outlet orifice having an adjustable outlet cross section and a plurality of radially extending lobed formations, to create a vortical or swirling and highly turbulent state in the fluid jet. The surfaces in contact with the fluid of the nozzle and/or of the plug member can either be smooth or have sharp edges which contribute to increase the turbulence and swirling state of the fluid jet; a highly effective mixing degree is thereby achieved in the manufacture of polyurethane resins, bi-component resins and molded articles.

Self-cleaning high-pressure mixing apparatus for composite material

A high-pressure mixing apparatus for producing and discharging a composite material resulting from a reactive mixture of at least a first and a second chemical components and from a filler material. The apparatus includes a main body, provided with a discharge duct for the composite material, at least one high-pressure mixing chamber for the chemical components and a first cleaning member axially displaceable between a forward and a rearward position within the discharge duct. The apparatus also comprises a second cleaning member with a control device selectively actuable to sequentially move the first and the second cleaning member between the rearward position, in which the first cleaning member opens the discharge duct, and the forward position in which the facing annular surfaces of the discharge duct and the second cleaning member are mutually abutting to eject the residual reactive mixture and close the exit port of the mixing chamber.

Method and high-pressure mixing device for the co-injection of polymeric components

A method and high-pressure mixing device for co-injection of polymeric reactive components, in particular for polyurethane and epoxy mixtures. The polymeric components are supplied in a common pressure chamber where they flow at a same pressure and in an unmixed state into a forwardly converging fore portion of the pressure chamber, and through a settable co-injection orifice to be co-injected, in the unmixed state, into a mixing chamber transversely oriented to the pressure chamber. The settable co-injection orifice consists in an elongated restriction that longitudinally extends on a side wall of the mixing chamber orthogonally oriented to an intersecting the forwardly converging fore portion of the pressure chamber; a first cleaning member and a second cleaning member are sequentially reciprocable in the pressure chamber to eject the remaining unmixed polymeric components, respectively in the mixing chamber to eject the remaining mixture, and stop elements are provided to set an open ...

High-pressure mixing device with sensored self-cleaning delivery duct

A device for mixing at high-pressure two or more reactive liquid components or resins includes a head-body provided with a mixing chamber with inlet and outlet openings for the injecting and recirculating reactive components; a single-piece tubular element, for delivering the mixture; a valve member with longitudinal recirculation slots; the tubular element is removably inserted into a pass-through hole of the head-body, having annular shoulder zone, separated and distant from the transversal hole; fixing elements removably lock the annular shoulder zone at the head-body for holding the tubular element in the aforesaid hole; a clearance gap between the tubular element and the pass-through hole of the head-body is provided such that the forces are exchanged through the annular shoulder zone; sealing and centering elements avoid leakages of polymeric mixture. Deformation-detecting elements detect the deformation conditions which the tubular element is subjected.

Method and apparatus with lobed nozzles, for mixing reactive chemical components

A method and an apparatus for high-pressure mixing of reactive chemical components. The chemical components are fed into a mixing chamber, by respective injectors at least one of which comprises a nozzle and a plug member for controlling the pressure drop; the nozzle and/or the plug member are shaped to form a lobed outlet orifice having an adjustable outlet cross section and a plurality of radially extending lobed formations, to create a vortical or swirling and highly turbulent state in the fluid jet. The surfaces in contact with the fluid of the nozzle and/or of the plug member can either be smooth or have sharp edges which contribute to increase the turbulence and swirling state of the fluid jet; a highly effective mixing degree is thereby achieved in the manufacture of polyurethane resins, bi-component resins and molded articles.

METHOD AND APPARATUS FOR FEEDING A POLYURETHANE MIXTURE INTO HOLLOW BODIES

A method and apparatus for feeding a polyurethane mixture suitable to form a thermally insulating layer inside hollow bodies, such as hollow walls of a refrigerator cabinet, freezer, display counter or insulating panel. A polyurethane mixture resulting from chemically reactive components, supplied by a high-pressure mixing device, is injected into a cavity of a hollow body extending in a horizontal plain. The mixture is injected at a first flow-rate and a first injection speed, to be poured into a first deposition zone farthest from the injection point. Subsequently, the flow-rate and the injection speed of the polyurethane mixture are gradually reduced in a controlled manner, to be poured in successive deposition zones towards the injection point of the polyurethane mixture, along a distribution strip, allowing the injected mixture to spread out throughout the cavity of the hollow body along isometric expansion lines.

Method and high-pressure mixing apparatus with self-regenerating seal

A high-pressure mixing apparatus for polymeric components suitable for providing a reactive mixture for a polymerizable resin, provided with a self-regenerating seal. An annular sealing element is housed in a circular seat inside a cross hole of a bush transversely extending to and in communication with the mixing chamber, in a sealing zone downstream the injection holes for the polymeric components, between the mixing chamber and the same delivery bush; worn and/or torn parts of the annular sealing element are automatically regenerated by the reactive mixture delivered during operation of the mixing apparatus.

HIGH-PRESSURE MIXING METHOD AND APPARATUS, WITH A SELF-LUBRICATING AND SCRAPING DEVICE

The high-pressure mixing apparatus, for reactive chemical components, comprises a device for self-lubricating and scraping the outlet duct of the chemical mixture, and flushing out the scraped residues. The self-lubricating and scraping device comprises a delivery chamber for the lubricant material axially aligned and in fluid communication with the outlet duct; the lubricant delivery chamber is connected to a storage tank by a feeding and re-circulation circuit. The lubricant is sucked into the outlet duct and subsequently returned into the delivery chamber by a cleaning member in the form of a pumping piston sliding into the outlet duct, the pumping piston being provided with scraping rings for removing the reacted mixture adhered to the inner surface of the outlet duct.

Method and high-pressure mixing apparatus with self-regenerating seal

A method for forming a self-regenerating seal in a mixing chamber of a high-pressure mixing apparatus for polymeric components suitable for providing a reactive mixture for a polymerizable resin. An annular sealing element is provided in a circular housing seat inside the mixing chamber, in a sealing zone downstream the injection holes for the polymeric components; worn and/or torn parts of the annular sealing element are automatically regenerated by the same reactive mixture delivered during operation of the mixing apparatus. A high-pressure mixing apparatus with self-regenerating sealing element is also claimed.

Apparatus for fine and controlled adjustment of an injection molding process and related industrial process

The invention relates to an apparatus for fine and controlled adjustment of an injection molding process and a related industrial process. The apparatus (1) has a sealed mold (2) supplied with fluid reactive resin via a supply inlet (8) and by means of a mixing and injection head (9) so as to impregnate with said resin fibers of composite material loaded inside a cavity (6) of the mold (2) and wherein at least one storage container (10) having an inlet/outlet opening (11) in fluid communication with an outlet (13) of said injection head (9) is provided so as to store a predefined quantity of fluid resin inside a storage chamber (16) prior to completion of the injection phase. Advantageously, the storage container (10) is a cylinder (18) defining internally a storage chamber (16) which houses slidably inside it a plunger (21) operated by an actuator (25) configured as a cylinder/piston assembly arranged as a coaxial extension of said cylinder (18) and comprising an actuating piston (15) ...