JPS6085906A - Composite nozzle for unifying and guiding at least two fludity reaction component forming plastic, particularly, foam plastic with object of starting of reaction by mixing and method of operating said composite nozzle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite nozzle for the merging and guiding of at least two flowable reaction components producing plastics, particularly foam plastics, for the purpose of initiating a reaction by mixing, as well as for operating this composite nozzle. 1 regarding the method
, the combined nozzle in this case comprises: a casing; a component supply conduit leading into the casing bore; a casing bore arranged in a Kuhnong and having a coaxial outlet passage at the end face; at least one needle sleeve guided coaxially; a nozzle needle guided coplanarly in the needle sleeve; between the surrounding wall of the casing bore and the needle sleeve and between the needle sleeve and the nozzle needle; and an inner chamber, each of which is connected to one component supply conduit, so that when the nozzle is closed, the nozzle needle cooperates with the inner end face of the needle sleeve while the needle sleeve is closed. The outer end surface cooperates with the inner end surface of the casing hole to form a seal seat, whereas when the nozzle is open, the coaxial nozzle opening of the needle sleeve [one part is separated from the nozzle needle]. The opening is such that a nozzle opening is formed between the outer end surface of the needle sleeve and the inner end surface of the casing bore.

Combined nozzles integrated into spray guns have proven their effectiveness in the field of spray painting technology using so-called "two-component lacquers". In this case, there is no need to place any emphasis on accurately metering and guiding the components together at the beginning and even at the end of the mixing process.

It is easy to imagine that this type of composite nozzle could also be used in the production of solid or porous plastics. In comparative curve IP applications, such as polyurethane insulating foam plastic technology, the known composite nozzles are sufficient to achieve the desired purpose. However, the use of the known composite nozzles, especially in the field of producing high-quality plastic parts by mold forming using molds, will inevitably reach its limits in the near future for various reasons.

l゛Iso-Federal Republic + 3D Patent No. 1.23; / / 90
In a two-component spray gun, in particular for the injection of epoxy resins, known from No. 1, two coaxial liquid nozzles are used for mixing, which are first widened and then narrowed again in the form of a tooth. On the end face which opens into the chamber and has a coaxial nozzle opening, a front piece with a mixing chamber is disposed, in which an inner metal fitting with a nozzle opening is arranged. [(A body is provided.

Furthermore, in this case, compressed air nozzles 1 and 1 are arranged inside and outside the mixing chamber, by means of which air is blown directly into the mixture or the exiting mixture jet is regulated. It is not guaranteed that the components will meet in a uniform manner at the beginning and end of the spraying process. This is because, since the operation is performed via the hand lever, it is not possible to obtain a sufficient operation speed.

A mixing chamber having such a complicated structure cannot be sufficiently cleaned without using a detergent.

The two-component spray gun used for lacquering polyester resins according to German Patent Application No. 1 Og-Tata-g also has the disadvantages mentioned above. In this known example, a first nozzle and a second nozzle are fixedly arranged one after the other and can be closed by a common nozzle needle, and in this case also a further coaxial air nozzle is provided. It is being The first embodiment of this spray gun has the disadvantage that one of the components precedes the nozzle when it is opened and lags behind it when it closes, so that the components remain unmixed. .

What about this drawback in its second embodiment? A disadvantage arises in that, in addition to cleaning, cleaning with detergents must be carried out.

Federal Republic of Germany Patent Application No., z, 2s, 2oo
In the technique disclosed by No. G specification 1, i.e., the technique of co-guiding a plurality of components such as polyol and isoneanate, a plurality of coaxial nozzles opening into a mixing chamber are provided. The mixing chamber of this prior art is expanded or contracted by means of a spring-supported insert depending on the component pressure, the nozzle opening being opened and closed by the component pressure acting against the pressure spring. This type of control method is no longer able to meet current requirements due to the inaccuracy of the nozzle opening/closing timing.3 If this method is adopted, the mixing chamber will be completely emptied when the nozzle is closed. , a completely reacted mixture film remains between the two radial surfaces, so that over time a mixture layer is formed in this mixing chamber.The main components follow the control gap. 41° in this known example.
In the 4th idea, there is a very small amount of nozzle processing due to the main component.
Only the ul speed can be adjusted. This is due to the relatively large diameter and the fact that the permissible control gap width must be set so that particles are not trapped within the control gap, resulting in functional disturbances. There is.

Furthermore, Federal Republic of Germany Patent Application Publication No. 203/(corresponding to U.S. Pat. No. 37779 Otsu No. 3)
According to No. 739, a method and an apparatus are known for producing foam materials or homogeneous plastics from at least two components that react with each other, each component being placed in a separate mixing zone. are brought into close proximity to the mixing zone, merged immediately before being injected into the mixing zone, fed together under negative pressure through a nozzle into the mixing zone, mixed within the mixing zone within a residence time of at least 171,000 seconds, and then This mixture is discharged. In devices implementing this method, the supply conduits are guided together just before the nozzle opening and reach a common compound nozzle facing into the mixing chamber. This device is equipped with a component pressure control device that acts against the tension spring, but the precision of this control device is low. Furthermore, in this case one component is fed in the central part by fitting the nozzle needle,
Only on the upstream side is it possible to shut off by means of a spring-loaded pressure valve. Secondary dripping is therefore inevitable, resulting in contamination of the components. Yet another drawback is that this composite nozzle is not suitable for application in RIM technology. This is because when using this composite nozzle, there is a risk that the central feed hole may become clogged with the layer of mixed material.

All these known multi-nozzle devices require frequent cleaning with detergents, are imprecise in their operation at the beginning and end of the component merging process, and therefore do not allow small amounts of the mixture to be mixed. The disadvantage is that it cannot be manufactured reproducibly.

The object of the present invention is to improve the composite nozzle of the type mentioned at the beginning and the method of operating the same so as to accurately guide the merging of each component according to their dosage ratios at the beginning and end of mixing. This means that no one component is allowed to lead or lag behind, that detergent-free operation is possible, and that even very small amounts of components can be reproducibly combined for the purpose of initiating the reaction by mixing. The goal is to make it possible to guide people. .

In the composite nozzle of the present invention proposed to solve this problem, the nozzle needle has a coaxial bottle, and the cross-sectional shape and dimensions of this IJ' are similar to that of the nozzle opening of the needle sleeve and the outlet. It is matched in cross-sectional shape and dimensions with the channel, and in the closed state the outlet channel is filled by this bottle up to the outlet.The nozzle needle as well as the other end of the needle sleeve are equipped with a forced control device (!/ ) are assigned.

By arranging a bottle at the tip of the nozzle needle and giving it a defined shape, first of all a self-cleaning mode of construction is achieved in the compound nozzle. If the nozzle needle and needle sleeve are forcibly controlled, the opening and closing movements of the nozzle orifice can be precisely synchronized with each other, resulting in precise distribution of each reactant from the first drop to the last. We will guide you to 01 go in terms of quantity ratio,
Moreover, at that time, it is possible to adjust so that one component does not take the lead or lag behind.

While the dimensions of the outleft passage of the compound nozzle, which is filled/filled by the bottle in the closed state, can be kept to a very small size, all components flow through this common outlet passage, so that especially small units of It is also possible to nozzle the amount of components per hour and thus make it possible to produce very small molded parts having a weight of only a few grams.

The novel technique according to the invention thus discloses a new field of application for the production of molded parts made of plastics, in particular polyurethane film plastics.

It is advantageous if the nozzle opening 1-1 of the needle sleeve and the outlet passage following it have the same diameter, to which the diameter of the bottle is adapted with a certain degree of tolerance. However, the diameter of the nozzle opening may be larger than the diameter of the outlet passage, in which case the diameter of the bottle must be increased or decreased accordingly.

- According to one embodiment of the invention, the compound nozzle has a plurality of concentric needle sleeves.

According to this measure, it is made possible to simultaneously guide three or more components or one component and several components simultaneously through different nozzle openings, so that a boundary layer exists between the individual jets. resulting in multiple contact zones.

It is advantageous if one or more needle sleeves and nozzle needles are each assigned a stroke stop that can be adjusted independently of one another. With this measure, the respective nozzle pressures and thus the respective jet velocities can be synchronized particularly easily. The adjustment ability of the stroke adjustment stop can also be fully realized, in particular during the mixing process, by mechanical or hydraulic or pneumatic means1, in which case it is advantageous if the stroke adjustment stop is provided with a remotely controllable control, e.g. Adjusted by desk. According to a special embodiment, the stop adjustment takes place automatically, for example as a function of the respective desired component pressure, and a suitable program for this can also be programmed in advance.

According to one embodiment of the invention, the forced control device consists of a hydraulic drive.

According to this embodiment consisting of a piston and a cylinder:
An extremely rapid opening/closing switch in the nozzle opening [-1 section can take place, so that one component leading or lagging is completely avoided.

In this case, it is possible to use the reaction component itself as the hydraulic medium; the nozzle needle and the needle sleeve are opened by the pressure of the reaction component, but their closing is effected by the usual hydraulic medium.

In this case as well, work is performed against the stopper, so
This embodiment also relates to a forced control method.

The component pressures and switching speeds and Ql are synchronized with each other so that each component joins at the first instant of opening of the nozzle opening and is interrupted precisely so that no component remains on its own when closing. I can do it.

According to a further embodiment of the invention, a component return conduit and a shutoff device are assigned to the combined nozzle, the shutoff device consisting of a hydraulic drive and a nozzle needle and one or more needle sleeves. It is connected to a hydraulic drive system.

In this way, the technique of circulating the components during the downtime, which is generally known in polyurethane ohm molding machines, can be applied to the composite nozzle according to the invention.

In order to carry out an unseparated conveyance when switching the circulation circuit to nozzle operation and vice versa, it is advantageous if the slider of the shut-off mechanism is provided with a bin. Note that this shutoff mechanism can also be used as a throttling mechanism for adjusting the circulation circuit pressure at the same time.

The nozzle needle and the needle sleeve or sleeves can also be used as switching parts by being provided with an extension or a groove or passageway which opens the passage towards the return conduit only in the closed state of the nozzle opening.

The nozzle opening of the reservoir of reaction components to be fed concentrically is, for example, between 30° and /jO°, preferably 4',
, t0 to /3j0, the nozzle opening is reliably sealed in the closed state.

If more than two components are supplied, the expense required to produce a corresponding number of concentric needle sleeves becomes significant due to fairly limited tolerance ranges, and in addition, in this case leakage resistance to becomes weaker.

1 According to one embodiment of the present invention, a supply conduit for an additional component reservoir is provided, the opening of which is directed into the guide hole of the nozzle needle, and a step is provided on the nozzle needle to adjust the opening position of the nozzle needle. It has been proposed to use this step as a control edge in such a way that the opening is free from the step and in the closed position the opening is closed by a shaft section with a larger diameter.

The advantage of the composite nozzle according to this embodiment is that it has fewer moving parts and therefore fewer seals, making it easy to manufacture without any problems. is released or allowed to drip by the step. It is clear that in this case the supply conduits for several additional components can be arranged in a similar manner. In this case, it is advantageous if the openings of each conduit are arranged at the same mutual angular spacing. Note that it is also possible to allocate a plurality of openings to one supply conduit.

Among multiple main components, the main component that does not react with additional components is
It is guided through an internal chamber located within the needle sleeve. This is because a mixture of main and additional components remains in this interior chamber after each working cycle.

If a plurality of mutually reacting additional components or a plurality of additional components reacting in part with one main component and in part with the other main component are to be supplied, an opening in the supply conduit is required. It is also possible to arrange the part 1.i) around the sealing seat of the needle sleeve having the casing hole. It is clear that in this case a plurality of openings can be provided for one supply conduit, or a plurality of openings and supply conduits can be arranged for several additional components.

In this embodiment, the additional component supplied in this manner is guided to merge with the other components just before being ejected from the composite nozzle.

In a further embodiment of the invention, the composite nozzle is combined with the forming tool via a starting guide and a corresponding connecting element.

The advantage of this embodiment is that the compound nozzle, which is otherwise stationary, can be brought into abutment against a forming tool that is moved periodically along it, for example on a turntable. . In this case, it is advantageous if a safety device known per se is provided, and this safety ↓,
, :ff, 'j releases the mixing process only when the forming tool is closed and the compound nozzle is tightly fitted 1,
For example, a slide guide is used as the contact guide, and the contact operation itself can be carried out, for example, by an associated hydraulic drive.

In this embodiment, a stabilization chamber is provided in the surrounding wall of the forming tool, located in front of the mold cavity, and the inlet opening of the stabilization chamber is aligned with the outlet opening of the nozzle at the connection position of the compound nozzle. It is advantageous if the molding tool is closed by a closing slide which is integrated into the wall of the forming tool.

If such measures are taken: - When connecting the composite nozzle to the forming tool, its outlet opening is sealed. The closing slide can be configured as an opening/closing slide. However, this closing slide can also open against the initial stress under the pressure generated under the mixture and can also be designed as an ejector for the residual mixture reacted in the stability chamber. This closure slide can also be configured to serve as a stability chamber or guide, for example. The travel of the closing slide can be adjusted, for example, by means of an adjustable stop. It is advantageous if the axis of the closing slide is aligned with the axis of the compound nozzle, but it may also have any other orientation, in particular an arrangement in which these two axes are at right angles to each other. It is possible. The closing slide can be operated hydraulically or mechanically,
Advantageously, it is automatically controllable.

In the process according to the invention for guiding the merging of at least two flowable reaction components forming a plastic, in particular a foam plastic, with the aim of initiating the reaction by mixing, the reaction components are fed in metered quantities; One reaction component is concentrically guided around the first reaction component by the force of one or more other reaction components in the center, and during this merging guidance, a central jet and one or more concentric jets are formed. The relative speed between the two is maintained.

This method provides the best conditions for initiating even mixing.

It is advantageous to have high relative velocities that create turbulence in the boundary layer between the jets.

This turbulent flow functions to sufficiently exchange particles between both jets. If the reaction components are difficult to mix due to their composition, it may be necessary to connect a mixing chamber afterwards, in which case it is sufficient that the mixture jet impinges on the corresponding surface. is often the case.

According to one embodiment of the method according to the invention, if more than two jets are present, another jet can be supplied or interrupted at any time.

This measure makes it possible to obtain conditions for imparting special properties to the finished product by varying the dosage ratios or by adding or removing further components during the mixing process. In this case, however, it is essential that appropriate needle sleeves be separately forcefully controllable.

. The composite nozzle according to the invention will now be explained in detail with reference to several exemplary embodiments shown in accompanying longitudinal sections: The composite nozzle shown in FIGS. 1 and 2 has a nozzle casing/ and two (fj 71;") supply conduits for the seventh component of j (incyanate and polyol)!, 3 and one additional component (e.g. accelerator) reservoir opening ll-
, 1 are introduced into said nozzle casing/3, a casing bore is disposed inside said nozzle casing/, and a base portion ll- is provided in said casing bore. 4 is guided, and a nozzle needle B guided in this sleeve or in an axial bore 4'7 arranged in the sleeve is concentrically surrounded by this needle sleeve j. ing. Ingredient supply conduit! is the inner wall g of the casing hole
It opens into an inner chamber 7 formed between the needle sleeve j and the needle sleeve j. The component supply conduit 3 is arranged inside the needle sleeve and opens into an inner chamber through which the nozzle needle 2 passes. This nozzle needle has a step 11-g which acts as a control edge, so that when the nozzle needle is raised, the supply conduit is open and in free communication with the inner chamber. On the other hand, in the closed position, the thick shaft section ≠ is the opening of the supply conduit ≠
Seal the evening. The nozzle needle B further has a tapered sealing surface 10, and in the closed state shown in FIG. At the same time, the outer end surface/3 of the needle sleeve j and the inner end surface/g of the casing hole 7
- Forms the constellation Le/Evening. When the nozzle needle B occupies this position, the pin B disposed at its tip completely fills the outflow passageway 7. In other words, how far does the pin reach the outlet? In the open state shown in FIG. Has a ring-shaped nozzle opening,
20 is formed.

Needle sleeve T and nozzle needle control device! / is assigned 1, this forced control device 2/ is a hydraulic drive device. 2.2.23, the driving device 22. , 23 is a cylinder chamber arranged in the needle IJ. 2g and the piston placed in the nozzle needle! Piston 727 forming an enlarged part of the casing hole from j1 to needle sleeve j
and the supply and discharge section. 2g.

It is formed from ivy. A relatively weak spring (not shown) acts on the piston 25, 27, and this spring keeps the nozzle knee 1 and the needle sleeve j closed when no hydraulic pressure is present. Ru. Stroke adjustment stylus (3o) assigned to needle sleeve J and nozzle needle O.

3/ is adjustable in an insert jO which closes off the cylinder bore or the hydraulic cylinder chamber 2B. Inner room 7. 3.2.3 Return conduit guided out of the
3 is a valve 311.3 arranged in the casing hole! ; is cut off by i'J' fit:. These valves 3g to 39 are Yabari Sibistone 3g to 39 and cylinder tag 0.
Hydraulic drive device 31 consisting of lI-/J-. ．． 3
7" knee is formed. The flow cross section can be adjusted by means of the stroke adjustment lever 1.2.'A3.The return conduit and the shutoff mechanism for the additional component reservoir are not shown.

This compound nozzle is combined with a forming tool j/.

The forming tool consists of two mold halves j, 2゜j3, 1 forming a mold cavity tg, and the mold halves j, 2 on the side facing the composite nozzle forming a composite nozzle. 1 having a centering notch, 5'j, that fits the centering part 5'j of the nozzle;
, while this molding part [tool j/ is fixed in position,
The composite nozzle has a contact guide of approximately 7]<37.3g.
The molding tool is movable within the molding tool. Determined center I τ] Kabe! The center notch and the center notch have matching surfaces 1' and 2 that match in the closed state. In the other mold half 53, a stability chamber is provided which extends in the axial direction towards the centering notch.

This stability chamber is also used as a guide for the closing slide holder, to which a hydraulic drive 3 and an adjustable stopper ≠ are assigned. In this embodiment, the closing slider 2 only has an opening/closing function, but it can also be used as an ejector for removing the residual mixture that hardens in the stability chamber 2. When the composite nozzle occupies a detached position (not shown), this stability chamber is fully exposed by the closing button slider Z at the earliest at the neck that abuts the forming tool Y, and in the abutting position. The outlet opening/g of the composite nozzle is sealed until nozzle growth is started.

In the abutting position of the compound nozzle, the outlet openings / and the inlet openings OJ of the stability chamber A/ are directly adjacent to each other and located within the same axis. The opening 6 of the supply conduit 7 for a further additional component (for example a dye) opens in the area of the sealing seat of the needle sleeve j with a housing opening.

The compound nozzle shown in FIGS. 3 and 1 differs from the compound nozzle in FIGS. At the same time as being surrounded by Lesleeve IO'l! Another two needle sleeves were guided concentrically to each other.

This is also covered by 10 Otsu. Nozzle needle 103 and needle sleeve 10il-.

10j and 10o each have separate adjustment i'il.
Noh Stotsunogu 107,101? , 109, /10 are assigned. Having already described the composite nozzle shown in FIGS. 1 and 2, there is no need to further explain the structure and mode of operation of the embodiment according to FIGS. 3 and 2.

Method Example In this example, a compound nozzle according to FIGS. 1 and 2 is used, but no combination with a forming tool is carried out.

Note that in order to make the method easier to understand, the supply of additional components was omitted by blocking the supply conduit ≠≠.

From the storage container, each component of polyol and innoanate is supplied to supply conduit 2,
3 to the compound nozzle, and in the closed state of the compound nozzle, a blocking mechanism 34t.

return conduit 3) by opening 35;

33 into the storage container again.

These cut-off mechanisms 3≠, 3j are such that each circuit pressure has a throttling effect on the polyol component. , ;:00<->, and the incyanato component is set at t10<-, respectively.

The amount of mixture required to produce one molded part is 20 grams. Since the metering pump delivers 30 durams per second and 973 grams per second of incyanate, the forced control device. 2/ must be adjusted to a nozzle processing time of 0.7 seconds. The piston, 23, in such a way that when the force control device, . , 27 loads are performed. When the needle sleeve j is in contact with the stopper 30, the nozzle opening 20 is opened, and when the nozzle needle is in contact with the stopper 30, the nozzle opening 20 is open. ing. If the injection pressure is selected appropriately, taking into account the structural dimensions and the different viscosities of the various components, the nozzle opening 15;'.

, 20, from the first drop after opening, it is achieved that both components are brought together in the outlet passageway/7 with a definite distribution ratio.1 Similarly, this effect is also noticeable when closed. becomes. The nozzle treatment of polyol to incyanate occurs at speeds of 720 to 30 meters per second immediately upon ejection, thus creating a relative velocity of 90 meters per second between the central polyol jet and the concentric in7anate jet. , turbulence is generated in the boundary layer between both jets.

[Brief explanation of drawings]

FIG. 1 shows a closed state of the compound nozzle according to the first embodiment of the present invention combined with a forming tool. FIG. 2 shows an open state of the compound nozzle according to FIG. 1, and FIG. FIG. 3 is a diagram showing an open state of the composite nozzle according to the embodiment, and FIG. 3 is a diagram showing a closed state of the composite nozzle according to FIG. 3. /, 102...Casing 1.2.3, 41≠, Otsu 7
...Supply conduit, ≠, 10/...Casing hole, evening. 10≠, 10 evening, 10 otsu...needle sleeve, otsu. 103... Nozzle needle, 7, 9... Inner chamber, etc.
...Inner wall, 10...Sealing surface, //, /lI-...
Inner end surface, /3... Outer end surface, /2. /Event... Seal seat, /Otsu... Bottle, /7...Outflow passage, 7g...Outlet, /9゜20...Nozzle opening, No/...
・Forced control device 1.22°, 23.3, 37. Otsu 3・
・・Drive device 1.2≠2.2 B・・Cylinder chamber 1.2
! ;, 27.31f', 3-9...Piston 1.2'
g, l... supply and discharge section, 30,3/. ≠2. ≠3...Stroke adjustment stopper, 32.33...
Return conduit, 3'l, 33...Valve (blocking mechanism), ≠0゜t
/... Cylinder, 4tt, 6 Otsu... Opening, Gu Otsu
...base part, gua...perforation part, g...step part, geta...shaft division, 0...insert body, j/...forming tool, j2゜j3...mold Half body, J-4'... shaped hollow chamber, 35... centered notch, l6... centered opening addition part, 37. Evening...Contact information, Juri, Otsu 0... Consistency side, Otsu/... Stable room, Otsu! ...Closing slider, O"
@, 107.70, iori. /10...Stsono', 1rt-...Inlet opening. Agent's name: Kawahara U" - Ho

Claims (9)

[Claims] (1) A composite nozzle for merging and guiding at least two fluid reaction components forming a glasstic, especially a foamsilastic, for the purpose of initiating a reaction by mixing, the casing comprising: a casing (1); (1
component supply conduits (, 2, 3) led into the casing (1); a coaxial outlet passage (
/7) at the end face (/1l-); at least one needle sleeve (j) coaxially guided in this housing bore;
) and the nozzle needle coaxially guided within the needle sleeve (Y) and the casing (ll-)
between the surrounding wall (d) and the needle sleeve (j) and the nozzle needle (B), each having one component supply conduit (2, 2,
3) are connected to the inner chambers (7, 9), and in this case, when the nozzle is closed, the nozzle needle (B) is connected to the inner end surface (7, 9) of the needle sleeve (j).
//), and the outer end surface (/3) of the needle sleeve (j) is also aligned with the inner end surface (/1l-) of the casing hole (ri).
They cooperate with each other to form seal seats (ix, i, B, respectively), whereas when the nozzle is open, the coaxial nozzle opening part (/9) of the needle sleeve (5)
) is released from the nozzle needle (B), and a nozzle opening (
20) in which the nozzle needle (B) has a coaxial bottle (/g),
The cross-sectional shape and diameter of this bottle (/B) are matched to the cross-sectional shape and dimensions of the nozzle opening (/9) and outlet passage (/7) of the needle sleeve (J-), In the closed state, the outlet passage (/7) is filled up to the outlet + (/I) by this pin (/O), and the other end of the nozzle needle (i) and needle sleeve (5) is provided with forced control. device (,2
/) has been assigned l:! Composite nozzle with i characteristics. (2) Multiple concentric knee sleeves (1011
A patent characterized by the provision of ゜103.10 B) (3) A plurality of stroke adjustment stops (30,3/:/07./0#,/09.
/0≠, /0ta, /0o) and nozzle needle (otsu: /0
3) The composite nozzle according to claim 7 or 2, characterized in that it is assigned to. (4) Claims 7 to 3 above, characterized in that the forced control device (, 2/2) is constituted by a hydraulic drive device (2.2, 23). The composite nozzle according to any one of the above. (5) Component return conduits (32, 33) and shutoff mechanism (3
71-, 3! ;), and in this case, the shutoff mechanism (3≠, 3) is a hydraulic drive device (3, 37).
It is characterized by being connected to a hydraulic drive device (2.2, 23) for a nozzle needle (B) and one or more needles IJ-7" (j). The composite nozzle according to any one of claims 1 to 5. (6) A supply conduit (/lp) for the additional component is provided, the opening (ll/-t) of which is located in the guide hole (g7) of the nozzle needle i). , the nozzle needle (B) has a step (#.S'), and this step (≠g) is used as a control edge to control the nozzle needle (B).
In the open position of (B), the opening (1L-Y) is connected to the stepped part (T).
and in the closed position the large diameter shaft section (l
Claims Nos./j to J, characterized in that the opening (gt) is sealed by the
A compound nozzle as described in any one of the following paragraphs. (7) The opening (4 O) of the supply conduit (Otsu 7) provided in the reservoir of another additional component forms a seal seat (/.2) in the needle sleeve (5) having a casing hole (Il).
The composite nozzle according to any one of claims 1 to 2, characterized in that the composite nozzle is arranged in the range of . (8) It is characterized by being combined with the forming tool (5) via the contact guide (,!; 7, 3g> and the corresponding connecting elements (SS, S, j, θ). A composite nozzle according to any one of claims 7 to 7. (9) A mold hollow chamber (,1+
) There is a stability room (Otsu/) located in front of the
The inlet opening (6) of the stability chamber (Otsu/) is the outlet opening of the nozzle (/K) at the connection position of the compound nozzle.
Composite according to claim g, characterized in that it is capable of closing BJ by means of a closing slide (B. Nozzle 3, (10) A method for guiding the merging of at least two free-flowing reaction components for the production of plastics, in particular foam plastics, with the aim of initiating the reaction by mixing, in which case the reaction components are In the case of metered feeding, in which one reaction component is centrally guided and one or more other reaction components surround and concentrically guide the first reaction component. , a method characterized in that during this merging guidance the relative velocity between the central jet and the concentric jet or jets is maintained. 71. A method according to claim 70, characterized in that high relative velocities are produced such that turbulence is formed in the boundary layer between each jet. 78. A method according to claim 70 or claim 77, characterized in that, if more than two jets are generated, these further jets are supplied or interrupted at any time.