The present invention relates to a spacer for high pressure mixing head comprising a control cylinder flange, a head body flange, and a plurality of uprights adapted to interconnect the control cylinder flange and the head body flange. At least one of the plurality of uprights comprises at least one deformation detection sensor applied at at least one available deformation surface thereof and adapted to detect longitudinal deformations and/or transversal deformations of the at least one of the plurality of uprights. The present invention also relates to a related mixing and dosing head and to a related apparatus.
An injector device for supplying a chemically reactive component to a mixing head includes a modular structure defined by a hollow housing and guiding body extending around a longitudinal symmetry axis and having one or more supply openings for supplying the chemically reactive component; in the hollow body a nozzle orifice is obtained arranged to face and communicate with a mixing chamber obtained in the mixing head; a pin-shaped partialization and control element, which is housed and slidably movable—along the longitudinal symmetry axis—in the hollow body and configured to vary a narrowed active section of the nozzle orifice; on the partialization and control element a tip portion is obtained that is conformed to receive pressure from the respective polymer component delivered to said hollow body so as to move away said partialization and control element from said nozzle orifice to vary the area of said narrowed active section; a modular adjusting and contrasting unit, which is removably couplable with the hollow body and with the partialization and control element and configured to exert an axisymmetric thrust action on the partialization and control element to arrange the partialization and control element in an initial position and preload condition to adapt the narrowed active section to a reference flowrate and pressure of the polymer component and subsequently to vary the position of said partialization and control element to adjust the narrowed active section according to the flowrate variation, exerting the contrasting force that is suitable for balancing the pressure exerted by the polymer component; the modular adjusting and contrasting unit includes a series of interchangeable elastic elements of conical disc shape, configured to exert a non-linear elastic action that is such as to contain the retracting stroke of the partialization and control element, limiting as much as possible the pressure variation at the variation of the flowrate of the respective polymer component entering the hollow housing and guiding body; the modular adjusting and contrasting unit, the tip portion and the nozzle orifice cooperate mutually to confer to the injector device a geometric conformation with high section gain, corresponding to a high ratio between the variation of the area of narrowed active section and the longitudinal shift of the partialization and control element.
B01F 25/312 - Injector mixers in conduits or tubes through which the main component flows with Venturi elementsDetails thereof
B01F 25/00 - Flow mixersMixers for falling materials, e.g. solid particles
3.
Method and apparatus for preparing and dispensing a mixture obtained by mixing chemically reactive components, at least one of which containing a filler material
A method is disclosed for preparing and dispensing a mixture obtained by mixing at least one first chemically reactive component and at least one second chemically reactive component containing a dispersed solid material by a high pressure mixing device comprising a mixing chamber for mixing the components, in which a valve member is slidable, in particular a slide-valve, provided with longitudinal slots for recirculating the components to respective storage tanks. The method provides removing from at least one tank, a dosed quantity of the at least second chemically reactive second component to with filler material is added; recirculating the second component through the slots of the slide-valve for a period of time that is comparatively very reduced with respect to a recirculating step of the at least first component through the slide-valve. An apparatus for preparing and dispensing the mixture is also disclosed.
The invention relates to a high-pressure mixing, dosing and recirculation head for injection or casting reaction molding, said high-pressure mixing, dosing and recirculation head comprising a head body, a mixing chamber, obtained in the head body wherein a valve element or mixing valve slides and in fluid communication with a supply duct, and a self-cleaning element comprising a scraping portion, said self-cleaning element being structured to slide in said supply duct, as well as comprising an apparatus for controlling and commanding mixing, supply and recirculation comprising a plurality of sensors and transducers mounted on board of the head body and of the components parts of the head connected thereto to detect and transform representative physical quantities of at least one operational status of said high-pressure mixing, dosing and recirculation head into electrical signals and an electronic control and storing system adapted to synchronously control and scan said sensors and transducers and adapted to receive and process said electrical signals indicative of said at least one operational status, at the beginning and during the operational phases of said high-pressure mixing, dosing and recirculation head to compare them with each other and with electrical signals representative of a predetermined reference operational status. The invention also relates to a high-pressure mixing, dosing and recirculation method for injection or casting reaction molding.
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.
A high-pressure mixing device adapted to form a polymeric mixture from the reaction of two or more reactive liquid components or resins, comprises a head-body with a mixing chamber having an inner cylindrical surface with inlet and outlet openings for injecting and recirculating reactive components; a duct for delivering the mixture, a valve body with recirculation longitudinal slots; the delivery duct, of the self-cleaning type, is a single-piece tubular element, insertable into a hole passing through the head-body, having an intermediate transversal hole aligned with the mixing chamber with a diameter greater than a diameter of the mixing chamber for avoiding protrusions of the walls of the transversal hole from forming inwardly of the mixing chamber of the head-body. Sealing elements duly arranged between the coupling interfaces of the various components prevent the leakage of polymeric mixture and lubricant liquid. There is also disclosed a related method.
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 tightly to the inner surface of the same housing cavity. The special equipment for fitting the sealing gasket element on the slide-valve and the so obtained recirculation and mixing apparatus is also described.
B29B 7/48 - MixingKneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
B29B 7/76 - MixingKneading using other mixers or combinations of dissimilar mixers with stream impingement mixing head
F16J 15/08 - Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing
B29B 7/80 - Component parts, details or accessoriesAuxiliary operations
F16J 15/46 - Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings
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) having a stem (22) coinciding with the stem of said plunger (21); the cylinder (18) of the storage chamber (16) and the cylinder (14) of said actuator (25) having cross-sections different from each other.
B29C 70/48 - Shaping or impregnating by compression for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM]
B29C 70/54 - Component parts, details or accessoriesAuxiliary operations
B29C 45/54 - Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
B29C 45/02 - Transfer moulding, i.e. transferring the required volume of moulding material by a plunger from a "shot" cavity into a mould cavity
B29C 45/53 - Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
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 of the two components is provided in a dispersion and containment chamber under pressure divided into two sections (6,7) by a head (14) of a cylinder-piston mixing 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) and in which adduction, dispersion and mixing occurs under high pressure (at least greater than 75 bar).
C08J 9/12 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
B29B 7/74 - MixingKneading using other mixers or combinations of dissimilar mixers
B29C 44/34 - Component parts, details or accessoriesAuxiliary operations
B01F 3/04 - Mixing, e.g. dispersing, emulsifying, according to the phases to be mixed gases or vapours with liquids
B01F 13/02 - Mixers with gas agitation, e.g. with air supply tubes
B01J 3/00 - Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matterApparatus therefor
B01J 19/18 - Stationary reactors having moving elements inside
C08G 18/42 - Polycondensates having carboxylic or carbonic ester groups in the main chain
B29K 75/00 - Use of polyureas or polyurethanes as moulding material
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.
An injecting device for injecting a polymer component in a mixing head (2) and for mixing it through turbulence with at least a second polymer component to produce foams and reactive polymer resins and moulded items comprises a hollow body (3), having a first axis (Al) and a supply opening (4), into which a supply conduit (5) opens for the polymer component, and a nozzle orifice (6) facing and communicating with a mixing and guide conduit (7) of the mixing head (2) that extends along a longitudinal axis (AL) that is arranged transversely with respect to the first axis (Al). A slide valve (8) for the recirculation of the polymer components slides along the longitudinal axis (AL), between a retracted position of non-recirculation, and an advanced position for the recirculation of the polymer components, is also provided.
An apparatus (1) for simultaneous and continuous foaming of two or more panels (2), comprising: supply means for supplying pairs of continuous web material (7) arranged above one another and mutually facing; a pair of conveying devices (5) comprising horizontal guiding and resting surfaces (10, 30) suitable for receiving and guiding respectively an upper web material (3s') and a lower web material (3i'); a plurality of dispensing devices (11A; 11B) arranged for dispensing respective flows of polyurethane or phenolic mixture for respective pairs of web materials; lateral containment devices for containing within the lateral edges the expanding mixture; horizontal partition wall means (13) comprising opposite upper (14) and lower (15) guiding and resting surfaces for respectively receiving on one side the lower web material (3i) of a pair and on the other side the upper web material (3s) of a further pair of web materials and for transmitting the thrust of the expanding foam from the upper web material of a first panel to the lower web material of a second panel placed higher and vice versa.
Method for simultaneous and continuous foaming of two or more panels (2), of the type each comprising a pair of external layers (3) of web material (7) between which an intermediate layer (4) is interposed made of polyurethane or phenolic material comprises the steps of: - i. moving through a foaming station (6) pairs of continuous web material(7; 7a, 7b, 7c, 7d; 7e, 7m, 7n; 7f ) arranged mutually alongside, each pair comprising two web material spaced apart from one another, which are the precursors of respective external layers (3); - ii. simultaneously dispensing a plurality of distinct jets of polyurethane or phenolic mixture into a lower zone (I) of a respective pair of web material (7; 7a, 7b, 7c, 7d; 7e, 7m, 7n; 7f), and containing below the polyurethane or phenolic mixture, enabling the upward expansion thereof; - iii. wherein during the movement in the foaming station (6) the web material (7; 7a, 7b, 7c, 7d; 7e, 7m, 7n; 7f) of each pair lie on respective vertical planes (V1, V2, V3, V4) and move along a horizontal advance direction (A), and - iv. contrasting the thrusts exerted by the expanding polyurethane or phenolic mixture transversely to the advance direction (A) by means of guiding and resting surfaces (10, 14, 29, 30) extending along the horizontal advance direction (A). A respective apparatus for implementing the above method is provided.
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.
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.
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.
B29C 44/42 - Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
B29C 44/34 - Component parts, details or accessoriesAuxiliary operations
patents
