DE2252872A1 - METHOD AND DEVICE FOR INJECTING LIQUIDS INTO A MIXING HEAD - Google Patents

Description

567-19.588P (19.589H) October 27, 1972

N. V. Bekaert S. Ao, Zwevegem (Belgium)

Method and device for injection of liquids into a mixing head

The invention relates to a method and a Device for introducing and mixing in a flow having a relatively low throughput of a Low viscosity liquid into a mass of high viscosity liquid with turbulence by introduction a gas flow under pressure into this mass.

Substances that result from hardening are known

Form a reaction between the molecules of a liquid. The final composition of this liquid contains one or more basic substances, optionally a catalyst and additives, such as e.g. B ₀ stabilizers, colorants, inflating agents, crosslinking agents or others. Certain components do not react or react very slowly with one another

(8th)

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and can be mixed before production, and others may only be combined with one another at the moment of processing »These premixes make possible a reduction in the number of ingredients to be combined during the final reaction.

This has the advantage of simplifying the feeding and mixing system of the machines for producing a such a substance and, above all, makes it possible to avoid that the duration of the premix is limited to the reaction time is.

This is how you can distribute and intensively mix small, well-dosed amounts in the final mixture thanks to a perfect premix in one of the ingredients.

Mixing heads were used for the final mixing of the liquid components in the manufacture of such a substance developed in the form of a spray gun or in some other form, which deliver the final mixture of two or more liquid component streams formed in the mixing head itself * arrive through separate feed lines and be in the Unite mixing head.

The line for the mixture stream obtained is with necessary means, e.g. B. provided a turbine to to create a turbulence that ensures good mutual penetration of the components before they pass through one Output channel are promoted.

The turbulence in the mixing head is sometimes maintained and improved by blowing in air, which is also used for conveying

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that of the final mixture serves to the outlet opening and is in Form of bubbles distributed in the mixture. This mixing with air turbulence is only applicable when the introduction of Air bubbles is allowed, such as B. in the production of plastic foams or in the production of layers, obtained by spraying the mixture on a support.

The supply lines are each connected to a storage container connected, which contains one of the components. In order to obtain an end product of the desired quality, the components are conveyed to the mixing head in precisely defined proportions, which can be seen with the help of volumetric technology Piston pumps that work in the same rhythm as the head, but their gait as a function of the desired proportion can be controlled.

In this case, however, if the head is to deliver discontinuous successive portions of the mixture, the volume of each part is linked to the volume of the pumps.

In addition, it is difficult to change the composition from one batch to the next, because then the length of the stroke the piston has to be changed, which requires a mechanical operation »There is therefore neither a fine volume control option still a precise way of controlling the composition of successive shares

A finer and more precise control of the volume of the parts is obtained by conveying with the help of gear pumps, which convey the liquid to the mixing head and their

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Speed ratio as a function of the desired proportions and the viscosity of the ingredients can be controlled.

The pumps then operate continuously and the inlet to the mixing head is controlled by needle valves, whose Opening time for each portion depends on the desired volume.

As long as the needle valves are closed, the liquid is returned to the reservoir.

However, this latter method, which allows easy control of the volume of each fraction, requires strict control of the viscosity of the components and does not ensure the same precision between the different ones Proportions of mixtures. In particular, this method is not applicable if one of the components, its viscosity is small compared to the others, to be taken in a small amount and in a strictly fixed dose is because small dose changes have large fluctuation changes in the course of the chemical process or in the quality of the final product.

The turbulence in the viscous mixture then occurs namely at the inlet port of the low viscosity component Pressure fluctuations, which have a great influence on the throughput of this component.

In this process, it follows that a low viscosity component which requires precise dosing is difficult to inject directly into the mixing head »

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Therefore, if the nature of this ingredient permits, it will be premixed with one of the viscous ingredients. It However, it is then not possible to deliver successive batches of mixtures in which the type and dose of this The constituent part could be different from one to the other as the batch composition depends on the composition of the premix in the storage tank is determined. It is not possible due to the dose or an additive a change in the environmental conditions or to change successively different products with different presettable products To generate properties.

The device with gear pumps and recirculation of components therefore does not provide a great degree of control the composition of the promoted mixtures and assigns does not have the required dosing accuracy for substances with low viscosity.

The invention has for its object to develop a method and an apparatus for injecting a component having a low viscosity in very precise doses into at least one other component, which at the same time a possibility of control is given of the composition provided _o It is desirable that the invention applicable both to systems with piston pumps and systems with gear pumps and generally to any device for introducing and mixing a stream of a liquid with a relatively low throughput and low viscosity into a mass of a liquid of high viscosity under turbulence by introducing a gas stream under pressure into this mass should be.

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The inventive method has to solve this Task the indicator that the liquid of low viscosity in the mass in the form of an aerosol in the gas stream is introduced.

The object is further achieved in that the device has at least one liquid atomizer, which is arranged in a feed line of the gas flow for fluidizing the mixture and with the supply source of Low viscosity liquid is connected.

In fact, instead of directly introducing the liquid of low viscosity, it is precisely this low viscosity and that of the gas to be introduced that can be used to introduce the liquid into the mixing head in the form of an aerosol. The gas z _e B ₀ air must be virtually blown under pressure, and the upstream of the input line pressure prevailing downstream is virtually independent of pressure fluctuations caused by the turbulence of the viscous substance in the mixing head.

This makes it possible to regulate well the dose of the liquid with low viscosity to be injected. To this end, the number of active atomizers or the pressure exerted on the liquid to be atomized is controlled. One can likewise ■ if changing an addition or change by changing an active atomizer in any moment.

Furthermore, injecting the liquid directly into the mixing head through a small valve creates clogging problems through the remnants of the mixture that harden and the

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Affect throughput by hermetically closing of the Ven.ti.ls. Each additional valve therefore brings with it minor problems, and this is how use proves to be several valves to control the throughput or to inject several additives as not very practical «

Now come atomizers that are in the supply line of the gas are not in contact with the mixture, and therefore there is no disadvantage when one Multiple atomizers used to inject multiple To enable additions one after the other or at the same time.

On the other hand, the introduction of the additive in the form of an aerosol enables more intensive and faster mixing than with direct injection.

This can be of importance when it comes to letting the liquid enter solution, before it can evaporate in the gas and escape with it, because then the dose can no longer be controlled. So you have the advantage of using the liquid with a low boiling point in To inject a cold gas under high pressure, which is expanded on the way to the mixing head. The droplets in the Gas are then well cooled at the moment they enter the mixture.

Further embodiments of the invention emerge from the following description,

The invention is explained in more detail with reference to the embodiment illustrated in the drawing; in this demonstrate:

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Fig. 1 is a diagram of a plant for the production of Polyurethane foam;

Fig. 2 is a vertical sectional view of a mixing head, which can be used in this system;

3 shows a vertical sectional view of the mixing head along the line AA ¹ in FIG. 2; and

Fig. K is a horizontal sectional view of this mixing head.

The invention is described below in its application to the production of polyurethane, but of course it can also be applied to the production of other foams, such as. B. epoxy foams or phenolic foams, or other mixtures, such as. B ₀ Use adhesives or paints with the proviso that inflation with air is permitted or necessary.

Their use is also always possible under the proviso that a low viscosity liquid with a low and controlled accurately proportion a flow of a liquid high viscosity to be mixed by vortex formation.

The limits of the terms "low" throughput or "low" or "high" viscosity are determined by where the difficulties of the required dosage for the intended application begin to arise.

The feed or supply system for the mixing head 1 is shown schematically in FIG. 1. It includes two

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Reservoir 2 and 3 for the basic components of the polyurethane » These are known per se. A first ingredient is a polyisocyanate and the other is a polyhydroxylated one Compound, generally a polyol resin.

You can get them in stores, where they already have the additives required for the production of polyurethane foam contain.

For the application of the invention, components are selected whose viscosity enables the implementation of the invention, ζ. Β »an isocyanate whose'viscosity in the container can be kept between about 15 and 400 centipoise, and a polyol resin whose viscosity in the container can be controlled between 500 and 15,000 centipoise, these Values are given for example only.

For the example described here, a polyol was chosen which is marketed by Bayer AG under the name "Desmophen DD 3004" and has a viscosity of about 900 centipoise at 25 ° C. and a density of 1, and an isocyanate which is from by the same company under the name "Desmodur hk VT" and has a viscosity of about 25 centipoise and a density of 1.22. These ingredients already contain some of the necessary additives.

However, there is a whole range of compounds and additives that are useful in this viscosity range in order to obtain a polyurethane, and which have been described in detail in FR-PS 1,550,808.

18/1007

The walls of the two storage containers have heating elements 4, which allow the viscosity of the stored constituent to be adjusted and a (not shown) per se known temperature control device can be controlled.

Each container is also provided with a mixing propeller, which is driven by a motor 6 to a Maintain uniform temperature and viscosity throughout the container. The tanks 2 and 3 are with the mixing head 1 connected by lines 7 and 8 via two pumps 9 or with an axial screw, which are used to convey the liquids serve in the mixing head ο

These pumps are driven by a single motor 11 e.g. B. Driven by a gear or belt transmission mechanism 12.

The gear ratio can be preset, the proportion of the isocyanate and the polyol resin as a function of the components used and the foam quality to be obtained.

For 100 parts of polyol resin, the gear ratio can be z. B. can be preset in order to obtain 30 to 120 parts of isocyanate at the viscosity values mentioned. In the example described here, the transmission ratio is based on a throughput of 39 parts of isocyanate each Parts controlled by polyol resin.

The lines 7 and 8 are connected to the mixing head 1 via inlet valves 14 and 15, which are normally

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are closed, opening them pneumatically is controlled each time a batch of products is conveyed will.

In order to avoid the cooling of the components in the supply lines during the closing times of the inlet valves and thus to eliminate irregularities in viscosity and throughput, are for the supply lines 7 and 8 return lines 16 and 17 are provided, which the correct position upstream of each valve with the upper part of the associated container 2 or 3 via flap valves 18 and 19 connect.

This device enables the fluids to flow back during the closing times of the inlet valves in such a way that that these liquids are also kept at the desired temperature and viscosity in the supply lines.

The feed or supply system of the mixing head 1 also contains a container 30 with compressed air, which is connected to a compressed air supply line 25 via a pressure reducing valve 31 is connected, which regulates the pressure in the container to about 5 at. This container that is used to evoke the fluidization in the mixing head 1 contains certain air, is with this through a line 32 and an inlet valve 33 connected, which opens each time a batch of product is conveyed.

The feed system of the mixing head also has two containers 23 and 2k for storing additives with low viscosity which, according to the invention, are injected by atomization.

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The first of these containers holds water or a coloring agent, while the other container holds one Low boiling point hydrocarbons and possibly fluorinated composition is used.

In the present example, the container 23 contains freon, while the container 24 contains water, the two additives representing inflation means with different effects. The containers 23 and ? .K are connected on the one hand to the compressed air supply line 25 via pressure reducing valves 26 and 27, respectively, which set the pressure in the containers to about 6 at "and on the other hand connected to six atomizers which are attached in the line 32 and which each one of the valves 34 to 39 is connected upstream, which are controlled by electromagnetic relays. These atomizers are described in detail with reference to FIGS.

Finally, an additional container 40 is provided for a flushing solvent, which flows through the compressed air supply line 25 is kept at a pressure of about 5 at via a pressure reducing valve 40a.

Two lines 41 and 42 that are in a common line 43 open, are with the upper part or the lower Part of the container 40 connected and have valves 44 and 45 in front of their opening in the line 43 on. The common Line 43 is connected to the mixing head 1 via an inlet valve tied together. The line 41 is used to remove compressed air above the level of the solvent in the container 40 and to their promotion to common line 43, while the Line 42 for removing the solvent and for its Promotion to this common line serves.

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The valves 44 and 45 are operated by solenoid relays controlled the delivery of either solvent or compressed air or a mixture of the two to the mixing head 1 to rinse it from time to time in order to avoid hardening of the material residue in the mixing head and prevent clogging or malfunction of the valves 14, 15 or 33.

Fig. 2 shows a vertical sectional view of the mixing head in a plane that contains the supply line 32 of the compressed air and the supply line 43 contains the solvent and the air for purging. The feed lines of the Polyol resin and the isocyanate are on both sides of the Head arranged in the horizontal plane and therefore do not appear in this sectional view.

The mixing head 1 has a cylindrical and vertical Miachkanal 51, which ends at the bottom in a line 52 for dispensing the mixture. A mixing turbine 53 is arranged in this cylindrical channel and is driven by a motor 54 to rotate about a vertical axis at a speed of approximately 3600 rpm. The upper part 55 of the cylindrical channel 51 », into which the supply line for compressed air and solvent and the supply lines for the resin and isocyanate flow, contains a small vane turbine 56 which rotates in fixed connection with the turbine 53.

The valve 46 for the inlet of the solvent under pressure is in the form of a flap one-way valve, which is below remains closed to the pressure that prevails in the mixing channel 51,

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and only opens under the pressure of the solvent that through the line Ό arrives.

In the body of the mixing head 1, a cylindrical channel 60 is provided for the inlet of compressed air, which at one its ends are connected to the compressed air supply line 32 is and opens at its other end in the upper part 55 of the mixing channel 51 with a valve opening, the release of which and closing is controlled by the horizontal displacement of a valve needle that is connected to the valve opening Valve 33 according to FIG. 1 forms.

The valve needle of the valve 33 is integral with a piston which slides in the cylindrical channel 60 and with its side opposite the needle forms an annular space 62 which is connected to the channel 60 via a piston valve 6J , the position of which is controlled by an electromechanical relay.

In one of its positions, this valve 63 connects the annular space 62 with the channel 60, while in its other position it connects the annular space 6z with the atmosphere. A spring 64 loading the piston 61 is provided in the annular space 62, while a stop 65, the horizontal position of which can be adjusted by hand, protrudes here from the outside.

In the first position of the valve 63, the pressures on the two end faces of the piston 61 are equal, and the valve needle of the valve 33 is pressed onto its seat under the influence of the spring 6k and closes the valve opening. In its other position, the annular space 62 is located

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atmospheric pressure, while the pressure of about 5 at, the acts on the opposite end face of the piston 6i, this presses against the stop 65 and the valve opens Releases ο The air throughput is determined by the position of the stop 65 controllable.

The cylindrical channel 6-0 also has six openings 60a in its wall for additional atomization, each of which is connected to one of the solenoid valves 3k to 39 (FIG. 1) vertical plane and are offset by 60 on the circumference, as Fig. 3 shows «

Three openings 60a are for the atomization of water, and the other three are for that of the freon. the Diameters of the three openings corresponding to a given addition are calculated and designed so that in one the same atomizing liquid pressure the second the double the first and half of the third interspersed. How to get there by choosing an appropriate combination of ! Diameters of the openings "60a with the help of the solenoid valves 34, 35 and 36 for the water as well as the valves 37 » 38 and 39 for the freon (Fig. 1) for atomizing the zero-fold up to seven times the throughput of the first opening.

The pressure of the liquids to be atomized can be Relation to the pressure of the compressed air can be controlled by means of the expansion valves 26, 27 and 31. In the case of the one described here For example, the pressure is controlled in such a way through the openings 60a a throughput of precise dosages in the range of 0-14 parts Freon and 0-3

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Parts water per 100 parts resin to allow, all Parts are calculated on a weight basis.

FIG. 1 k shows a horizontal sectional view of the mixing head 1 at the level of the upper part 55 of the cylindrical mixing duct 51 with the small vane turbine 56 and the openings through which the constituents enter the mixing duct 51. In this figure you can also see the compressed air inlet duct 60 in horizontal section. You can also see the ends of the lines 7 and 8 to the inlet of the polyol resin and the isocyanate with their valves 1 ^ and 15 ·

The feed line 7 of the polyol resin opens into one cylindrical channel 70, which in turn is in the upper part 55 of the mixing channel 51 opens with a valve opening whose Release and closure by horizontal displacement of a Valve needle is controlled, which forms the valve 14 with the valve opening provided in part 55. The valve needle is fixed in the middle of two curved elastic discs 71 and 72, which divide the channel 70 tightly into two parts subdivide. These elastic discs have two stable positions in which they can move in one direction or the other are arched. In one of these positions, the valve needle of the valve 14 is pressed against the valve opening and lock this. In the other position, the valve needle is withdrawn and opens the passage for the resin.

The said two parts of the channel 70 are connected via bores 73 or 7 ^ to a compressed air source, and each bore is provided with a solenoid valve (not shown), which serves for the supply of compressed air pulses. A pulse that arrives through the bore 73 leaves

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the elastic discs 71 and 72 jump into the closed position of the valve opening of the valve 14, and an impulse, arriving through the bore 74, leaves these disks in their reverse, d. H. Jump to the release position of the valve » The resin throughput can be adjusted manually by setting a stop 75 «

The isocyanate enters the mixing head 1 through a same device as used for the entry of the polyol resin has been described. It includes a cylindrical Channel 80, which is connected to the Xsοcyanatzuführungsleitung_-8, the valve opening of the valve 15 on upper part 55 of the Misehkanals51 can be released or closed by means of a corresponding valve needle can, which represents the valve 15 with the opening.

The valve needle is controlled by pressure pulses which arrive through a bore 83 for closing or through a bore 8k to release the valve opening. The isocyanate throughput can be adjusted by setting a stop 85 on the edge.

The electrical and electromagnetic elements that. for controlling äev Drttckluftzuführventiiedurcli <ii · Bore holes 731 Ik, 83 and Bk for controlling the piston valve Ί $ 3ιdae regulates the compressed air supply in the Miechkanal 51, as well as for controlling dea? Valves Jk bi »39,""-« ti * - ^ i * JSttftthfune dfi · enable additives to be atomized, serve, are not shown in the figures. These elements are known per se and it is known that they can be replaced by other analogous means, e.g. B. pneumatic relays etc., _{t are} replaceable.

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These electromagnetic elements are operated via electrical switches or interrupters , which are provided on the mixer head itself or on a control panel that carries the pressure gauges and the expansion valve control elements and the control means for maintaining the temperature of the components. These switches can also be controlled by a drum, card or punch card program that determines the sequence of the quantities to be enforced .

The operation of the plant is as follows: One fills
the containers 2 and 3 with the polyol resin or with the Iso cyanate, in which the other additives and possibly also the
invariable part of freon and water are already contained . The ingredients are heated in the containers
to a constant temperature of about 25 C with the aid of the heating elements 4 controlled by an auxiliary device in order to obtain a viscosity of about 900 centipoise for the polyol resin and of about 25 centipoise for the isocyanate . The motors 6 are started so that the
Mixing propeller 5 mix the mass well and bring about an even temperature in each container. The containers 23, 2k and kO are then filled with Frβon or water or solvent, whereby the container kO can only be filled up to a level at which the connection point of the line k '\ on the container is not reached.

The containers are then pressurized by adjusting the pressure reducing valves that connect them to the compressed air line 25 accordingly. The pressure in the containers 30 and kO is set to 5 "t, and the containers 23 and 24 are adjusted to a higher pressure, approximately 6 at", this pressure difference being used to inject the liquid into the compressed air.

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Then the gear ratio of the motor 11, which drives the circulation pumps 9 and 1O, to about 6 revolutions for the polyol resin pump 9 per 1 revolution of the isocyanate pump 10 is set in order to achieve a throughput from about 39 parts of isocyanate per 100 parts of polyol resin.

Then the pumps 9 and 10 are started, and they bring the liquid of the containers 2 and 3 through the lines 7 and 16 or 8 and 17 and the flap valves or »19 in circulation All valves are in this waiting position closed on mixing head 1.

By pressing the associated buttons you can carry out a few production tests and adjust the pressure of the containers 23, 2h and 30 and the position of the stops 65, 75 and 85 so that you get a suitable mixture.

The actual production program can then be started. At the moment a mold is introduced under the mixing head, the motor 5h, which drives the mixing turbine 53, is set in motion and the solenoid relays are actuated to first open the valves 1h and 15 for the inlet of the viscous components, then, when the mixing duct 51 is sufficient is filled, the vortex air inlet valve 33 and finally, when the air flow has formed suitable, to open one or more of the valves 3h to 39 depending on the amount of water and Freon to be injected.

After opening the valves 14 and 15, the pumps deliver 9 and 10 instead of the previous circulation

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Liquids through the associated supply line 7 or and the associated valves Ik and 15 in the upper part of the mixing channel 51

In this part the liquids are mixed by the vane turbine 56. While the resin and the isocyanate further entering the mixing channel 51 is the valve 33 open and turbulent air passes through line 32 and the cylindrical channel 60 into the mixing channel 51. In This channel distributes the compressed air in the form of bubbles in the mixture, which causes the turbulence and mutual penetration of the constituents, and pushes the mixture into the lower part of the channel. In this lower part the turbine 53 continues mixing the ingredients and air until the mixture passes through the outlet conduit is dispensed into the form located under the mixing head 1.

Immediately after the compressed air valve 33 has been opened, the electromagnetic relays are also actuated in order to open one or more valves 3h to 39, depending on the desired composition of this first batch.

Due to the pressure difference between the liquid and the compressed air, water and / or freon penetrate into the pressure air duct 60 in the form of small droplets in suspension in the air. This aerosol arrives in the mixing channel 51 ″ in order to cause turbulence here and to distribute itself in bubbles.

In a known mixing device with direct injection of Freon into the mixing head, there is always the risk of

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that part of the freon evaporates in the vortex air and thus enters the outlet mass of the mixture without gone into suspension or solution in the liquid to be. The greater the heat, the greater the risk is released when mixed by the chemical reaction will.

Freon, on the other hand, is a compound with a low boiling point of about 22 ^° C., which is chosen precisely so that it evaporates under the action of the heat released by chemical reaction to form bubbles in the polyurethane foam. Das'Freon should therefore not evaporate too early.

In the device according to the invention, on the other hand, the compressed air of 5 atm, which is the conveying means for the freon droplets, suddenly relaxes when it enters the mixing channel 51 "which causes the droplets to cool" that are mixed with the viscous liquid, min rapid «dissolving de · Freon *«

'It was actually agreed that daa not evaporated prematurely in the device according to the invention. -

So you get an intense exploration of the » aera and de · Freons in the viakoaen leaktionaaaaae what a good evenness of the dimensions of the bubbles in the ensures the foam obtained

After submitting the first batch of rental, whose pre- BATH ORIGINAL

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lumen is determined by the opening time of the valves \ k and 15, the electromagnetic relays for closing all valves with the exception of the compressed air inlet valve 33 are controlled. Pure compressed air is then admitted into the mixing duct 51 in order to clean the air inlet opening of the valve 33 on the mixing duct 51. Thus, the valve 33 does not require any additional maintenance in order to prevent clogging by residues of hardened mixture. The compressed air also serves to clean the mixing channel 51 and the turbine 53 and to expel the residues to the outlet line 52, from where these residues are expelled into the mold.

Finally, the solenoid relay that controls valve 33 is actuated to close each inlet of pressurized air in shut off the mixing channel 51.

The mold with the dose of the mixture is closed, and the mass begins its reaction to form a Polyurethane foam. This foam hardens and fills the whole shape. This can e.g. B. the fora «ine · pillow to have.

During this process, a following · Fora is made below brought the mixing head 1. This fora can be a subject made of foam, which is not identical to the previous one z. B. a less dense gravel β · 1η can.

Therefore, the programmer who fires the elctroaagnetrslais to open the valves 3k to 39 «has to find a different combination of the opening sides of these valves,

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order as a function of the required density and hardness to add a larger dose of freon or water to the mixture.

The control cycle of the inlet valves 14, 15 and 33 is exactly the same with the exception of the opening time of these valves as a function of the volume to be conveyed and with the exception of the combination of the opening times of the valves 3k to 39. absorb a suitable amount with a suitable composition.

The system is therefore suitable for dispensing successive mixed amounts of a composition which varies from batch to batch.

Before the end of the operation, the mixing head 1 should be cleaned thoroughly in order to prevent residues from hardening here. For this purpose, the solenoid control devices of the valves kh and k5 are actuated in order to open them.

Then a mixture of solvent and compressed air is conveyed through the flap valve k6 into the mixing head 1 in order to clean it and to rinse the inside. This flap valve is of the one-way valve type. Finally, the valve 45 can be closed in order to let through a last stream of only pure air and thus dry the whole thing. The working cycle is then ended after the valve kk is closed.

Although the invention is particularly applicable to the manufacture of polyurethane foam, it is self-evident the type of components used or their number

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not limited, if the problem arises, a small one and delivering accurate dose of one low viscosity liquid to another high viscosity liquid, their Turbulence is the control of the inlet flow rate of the liquid low viscosity.

This problem can be reduced with the injection of catalysts, coloring agents and any additive Set viscosity, the dose of which is very important and can be changed from processing quantity to processing quantity should be.

The invention is also not limited to the throughput and viscosity values given by way of example not limited to the means of uniting and mixing the ingredients, but only the introduction a gas under pressure in which the low viscosity additive is in the form of an aerosol.

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Claims (7)

Claims (T). Method of introducing and mixing in a relative a small amount of a liquid of low viscosity into a mass of a liquid of high viscosity in turbulence by introducing a gas stream under pressure into this mass, characterized in that the Low viscosity liquid is introduced into the mass in the form of an aerosol in the gas stream. 2. The method according to claim 1, characterized in that that the gas is air. 3. The method according to any one of claims 1 and 2, characterized characterized in that the bulk of the liquid of high viscosity is a mixture of isocyanate with compounds with several active hydrogen atoms, which is capable of reacting to form polyurethane, and that the liquid low viscosity is a substance causing foaming. k. A method according to claim 3, characterized in that the low viscosity liquid is water, a low boiling point hydrocarbon or a fluorinated hydrocarbon. 5. Device for performing the method according to one of claims 1 to k _t, characterized in that it has at least one liquid atomizer (jk to 39, 60a) which is in a supply line (32, 6o) of the 309818/1087 Gas flow arranged to fluidize the mixture and a low viscosity is connected to the supply source (23, 2k) of the liquid. 6. Device for the production and throughput of a Geraisches of at least two components, a mixing chamber, at least one feed line for introducing a mass of a liquid of high viscosity into the chamber, a feed line for introducing and distributing a gas in the or the mass, the is located in the chamber and has means for causing a turbulence in the mass, characterized in that it has at least one liquid atomizer (3k to 39, 60a) in the supply line (32, 6o) of the gas. 7. Device according to one of claims 5 and 6, characterized in that the gas supply line (32, 6o) has several atomizers (3k to 39t 60a), the mouth diameters and positions of which are set up to deliver different throughputs of a liquid of the same pressure. 309818/1087