JPS6027511A - High-pressure collision mixer - 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 TECHNICAL FIELD This invention relates to an apparatus for high-velocity impingement mixing of two or more liquid polymerization reactants, such as polyurethane, and dispensing the mixed reactants into a mold cavity or surface.

In pressure impingement mixing, 28 Il or more of liquid polymerization reactants are directed from opposite directions into a common mixing chamber to mix the reactants together and achieve a homogeneous reaction.

The mixed reactants are distributed from the mixing chamber to the mold cavity or surface. A typical mixing device of this type is U.S. Patent No. L70 (1
, 515 and 4,289,732.

The mixing head is manufactured by anti-single-core injection molding (
RIM). For RIM jQ+, the mixing head is mounted as a part of the sealed mold, for example on one of the mold dies. The mixed material is distributed into the mold cavity using a post-mixer device, runners, and film gates.

Mixing heads of the type described in the above-mentioned Takekiba Seichu can be used, for example, for open injection to dispense the mixed material into an open mold which is then closed after dispensing the reactants. but,
In opening injections, the use of known crystallographic mixing devices ft is limited to the treatment of certain chemicals only. Postmixer a (remixing reaction W) and pond RI
Due to the lack of M equipment, known high-pressure equipment is used for chemicals that can be mixed in a very short time, sufficiently preventing phase separation of the reactants, and to the extent that it is possible to carry out the nail bed and creaming process to a certain extent.
In particular, mixtures that are essentially emulsions are limited to those types of chemicals that remain stable until the viscosity of the mixture increases.

The drawbacks of known high-pressure impingement mixers are that i9'd [
Certain elastomeric type materials, when not used with a post-mixer device and gate system integrated into the mold,
For example, it has not been possible to process materials used for automotive instrument parts or furniture parts with this type of equipment. Similarly, when using open molds, despite high pressure impingement mixing and the development of new l/A chemistries,
It has not been possible to produce products such as polyurethane shoe soles using high pressure devices with properties as good as those achieved using low pressure metering and mixing systems.

The same is true for the manufacture of parts made from self-skinning foam materials, where the skin corresponds to the finished surface of the part. Typical parts of this coffin are automotive, aircraft or furniture armrests, as well as head supports and handles. Irregularities in the skin surface due to insufficient mixing or separation action, and lead skin spots on the surface render the part useless. until now,
Materials of this type could only be processed in low-pressure machines or using specific molds, ie molds matched with suitable post-mixer equipment and gating systems.

Currently, it is highly desirable to use high pressure impingement devices in areas where only low pressure systems are available. Because high-pressure impingement devices mechanically clean the reactants in the mixing chamber, compared to low-pressure systems, they eliminate the evaporative separation of solvent required by low-pressure device a, resulting in considerable savings and dramatically reducing waste material. can be reduced. Additionally, environmental considerations associated with the use of solvents used in low pressure equipment, such as methylene chloride, are eliminated.

If the mixed product is of a quality suitable for low-pressure systems, the [i! It is also possible to easily perform the exchange. Types and models currently used in low pressure systems can be retained unchanged in high pressure impingement mixing. High-pressure mixing also requires the integration of post-mixers and film gates into the mold when equipment is available that does not require a tortuous post-mixer and film gate for effective mixing and composition of the final product. Currently known RI
Replacement types can be built cheaper than with the M process.

In the past, many efforts have been made to extend the range of applications of high pressure impingement mixing systems. This Yuzu design changes the flow condition of the mixture at the mixing head outlet, which is the agitating flow characteristic of high-pressure equipment, and creates a laminar flow without bounce at the mixing head distribution outlet for the opening and pouring effect. directed towards achievement. One example of this type of device is the U.S.
It is described in '74 issue. Krauss 77A and Canon market laminar flow distribution devices in the form of an L-shaped mixing head. In this coffin apparatus, the reactants are mixed in a relatively small mixing chamber, and then the reactants are placed at right angles to the mixing chamber.
The mixture is passed through a large distribution cylinder with discontinuities in the flow direction. Bayer-Hennek currently markets a mix head that faces the reactants from opposite sides of a distribution chamber in which the reactants are mixed. This involves inserting a flow restriction between the mixing section and the outlet of the distribution chamber, making the flow of the agitated mixture discontinuous and resulting in a laminar flow at the outlet. Although the achievement of laminar flow improves the performance of using high-pressure mixing systems for open injection, known devices of this type have not yet yielded satisfactory results when used in the above-mentioned applications.

SUMMARY OF THE INVENTION The present invention provides a high pressure impingement mixer for mixing and dispensing two or more liquid components that effectively and completely mixes the reactants and dispenses a fully mixed laminar flow suspension. It is in. The device M can be used in place of known high pressure reactive injection retractable yarns without the use of conventional post-mixers and film gates.

Depending on the materials involved, the device can also be used effectively in place of low pressure mixing systems in open operations where high pressure mixing devices have heretofore been ineffective.

More particularly, A1: Make it an invention. - The stone-pressure mixing equipment is a mixing chamber in which one or more reactants are injected at a constant velocity, and the product from the mixing chamber is accommodated and the flying state of complete mixing is also perpetuated. a post-mixer chamber installed with a complete mixer chamber, and a transfer distribution chamber installed to accommodate the mixture from the post-mixer chamber and distribute the mixed reactants after converting the flow from the stirring flow to the backflow flow. has.

In a preferred embodiment, the mix head includes a transfer dispensing chamber having a hydraulically actuated cleaning plunger therein.

A mixing chamber containing the anti-unilateral material is provided at right angles to the transfer and distribution chamber. a device for introducing the reactants into a mixing chamber for collisional mixing;
and devices for selectively interrupting the supply of components are known. A particularly advantageous thread for supplying the reactants to the mixing chamber is rice:" Patent No. 4,239. ? It is written in No. d2. The supply and discontinuation of the components is controlled by a hydraulically actuated plunger located in the mixing chamber which, when moved to the pushed position to prevent mixing, sweeps out any remaining mixing components in the mixing chamber; .

The mix head also has a cylindrical post-mixer chamber with a hydraulically actuated cleaning plunger located in parallel.

The axis of the impingement mixing chamber intersects the axis of the cylindrical transfer and distribution chamber at an angle. Further, the post-mixer room is perpendicular to the transfer and distribution room. Mixing room and post mixer room? : on the same side of the transfer distribution chamber so that the product from the mixer is directed across the transfer distribution cylinder to the post-mixer chamber. The postmixer chamber has a larger diameter than the mixing chamber. Preferably, the center of the cylindrical post-mixing compartment is at a location Lt such that the flow exiting the mixing chamber is directed into section F of the post-mixer compartment.

For the dispensing operation, the various mixing devices 1' are operated as described below. First, the transfer dispensing chamber is opened by retracting the dispensing plunger. The post-mixer chamber is then opened by retracting the post-mixer plunger. Eighth, preferably after fully opening the post-mixing chamber ((3), retract the cleaning plunger of the mixing device +i7 to open the mixing chamber. At the same time, retract the mixing chamber plunger and direct the impingement nozzle toward the mixing chamber. open and begin impingement mixing.The material dispensed from the mixing chamber is mixed with a comparatively small cross-sectional diameter of 1%.
Exit the warehouse, cross the transfer/distribution room, and then enter the mixer room.

As the flow enters the post-mixer chamber, the face impinges on the rear wall of the post-mixer chamber (the front bend of the post-mixer plunger) and is deflected towards the transfer distribution chamber. This deflection is mainly due to the chamber arrangement and Je
Due to the situation, the flow that originates in the L direction and is diverted is transferred and distributed 4
Return it towards the top of the screen. From here, the flow must proceed around the flow passing between the mixing chamber and the post-mix single-person chamber (ie, across the transfer distribution chamber). In this way, the flow leaving the impingement mixer a is first transferred across the transfer distribution chamber to the post-mixer chamber and then returned to the transfer distribution chamber for distribution.

The arrangement according to the invention increases the agitation conditions not only in the first mixing chamber, but also in the post-mixer chamber and in the upper part of the transfer distribution chamber. Agitation is maintained by a flow deflection pattern in the post-mixer and is facilitated by continuous counter-flow conditions and flow deflection of the material within the post-mixer chamber. In addition, when the stirring flow leaves the mixer chamber and reenters the transfer/distribution chamber, the mixing stream is redistributed to L from the high-pressure cross flow of the components leaving the mixing chamber, until it reaches the transfer/distribution cylinder outlet. Keep it flowing around the cross flow. The liquid particles statistically pass through the laminar flow several times before finally entering the transport distribution ♂.

In the transfer distribution chamber, as long as it flows around the high-velocity mixing chamber cross flow, according to the law of continuity, the flow in the transfer distribution chamber is decelerated to balance the flow field relationship.

When the distribution reaches +jiJ, the flow pattern is such that it is distributed in a stable flow with no return.
Become f-style.

To complete the mixing cycle, the mantissa plunger is operated in reverse order. The mixing piston is moved to its extrusion position to prevent any more reactants from being fed into the mixing chamber, thereby terminating the mixing and simultaneously pushing the reactants into the mixing chamber. The post-mixing plunger is then moved to its extruded position and the post-mixer is mechanically cleaned, and finally the cleaning plunger of the distributor 41'η is activated to remove any residue in the transfer distribution chamber.

The series of opening and closing takes about several tens of seconds. Control the circulation time for dispensing operations as required. Typically, dispensing cycles range from a few tenths of a second to 30 seconds or more.

If desired, the mixing device can incorporate supply devices for either liquid or gaseous components, such as color formers, catalysts, blowing agents, air or nitrogen. Preferably, such additives are distributed into the mixture in the aftermixer chamber and mixed with the main component while it is still in the agitated state.

The mixing device according to the invention can be of different sizes and shapes to suit the different volumes required for each application.

The use of a device for feeding portions into a mixing chamber of the type shown in U.S. Pat.
Facilitates construction of small volume units as well as large volume unit mixing equipment providing flow rates of /sec or less. As a result, the present invention provides a method of free injection, as can currently be carried out using only low pressure machines.
It can be used to manufacture small as well as large parts.

The mixing device according to the invention can also be used advantageously for injecting reactants into sealed molds. Because of the improved initial mixing in the integrated mixing chamber and post-mixer room, the use of conventional post-mixing devices, which are usually serialized in each mold, is obsolete. Furthermore, according to the present invention, it is possible to use a shorter runner from the filling hole A to the W hole.
I will make a reservation.

Hereinafter, an example of the non-inventive fabric will be explained in detail based on the drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In FIGS. 1 and 2, the mixing head housing 1
0 includes a transfer distribution chamber 1 having a cleaning plunger 14 therein and an outlet 14 for dispensing the mixed components.
Contains 2. The cleaning plunger 14 can be selectively pushed out by a piston 16 surrounded by a cylinder 1B between a retracted position and an extended position (shown in TE). hole 1
Operate by introducing hydraulic flow to 9 or 2υ.

A mixing port 22 is provided in the mixing head housing 1υ, and a cleaning plunger 24 is provided therein.

The plunger 24 can be displaced between a retracted position 1 (shown at 1) and a pressed position, and the forward direction of the flansha 24 is pushed out by the actuating piston 26 to the transfer distribution chamber J2. . The piston 26 of the mixing chamber is surrounded by a cylinder 28 and is actuated by introducing a hydraulic flow into the mouth hole 29 or 3o.

Interrogating the mixing chamber 22, there is a post-mixer chamber 32 which has a larger diameter than the mixing chamber 22. Cleaning plunger 34
is provided in the rear mixer chamber a2 and can be selectively displaced between a retracted position (as shown in the figure) and an extruded position, the normal direction 85 of which is extruded into the transfer distribution chamber 12. The plunger 34 can be moved by means of a hydraulic flow directed through the mouth hole 89 or 40F between a retracted position and an extruded position via an associated piston 86 disposed within the cylinder 8B.

On the second side, the mixing head house sink 10 is roughly connected to the mixing head 22 for impingement mixing with two shelves of pressurized main components A and B.
and injection devices 42 and 44 for introducing the . Each injection device 1242 and 44 is described in U.S. Patent No. 4,289,782.
Although it is preferable to have a structure as described in the above issue, the relevant parts are shown here for reference. In this kind of arrangement, the two main IJz portions A and B are fed from each reservoir 45 to the inlets 46 and 48 in IJllI:E by pumps PA and PB. The inlet is in communication with the vertically displacing plunger 5o, and each inlet has a vertical passage that sprouts here, and each anti-uniform object A and B is a plunger passage? Have you passed away□? I started to get out of control.

J5 is at the mixing location shown in the figure, the plunger 24 is in the retracted position, and the entire +fiJ end of plunger 5' The nozzles Iji70 portions 52j6 and 58 that are open are pressed in the +jiJ direction. JJO compressor fractions A' and B are accelerated through nozzle opening 1'Jt51s52, 58 so that the reactants collide with mixing chamber 22B at high speed.

Mixing by repulsion of plunger 24 as disclosed in US Patent No. 12A9.7A2? Start and interrupt. As the plunger 24 moves to the pushed-out position 1n, it simultaneously blocks the flow past the nozzle Ijd ports 52 and 53 and prevents the reactant from being discharged into the chamber 22. Inlet opening 52,! 1131, plunger 5o retracts and flow fractions A and B begin to recirculate through recirculation tines 56 and 587i. Correspondingly, when plunger 24 is retracted to begin mixing, the pressure within reactant feed plunger 50 advances plunger 50 to direct the already (recirculated) flow fraction into the mixing chamber. let Mixing is started and interrupted without introducing delays or creating pulses or pressure fluctuations in the metering system.

The aforementioned US Pat. No. 4,289,782 discloses examples of various injection devices that can be used with the present invention, with an injection nozzle located in the nozzle opening or plunger passage. However, the special design of the injection device for supplying and injecting the ingredients into the mixing chamber 22 does not form part of the present invention, and other injection device configurations may be used.

In FIG. 2, the housing 1o of the transfer dispenser has additional inlets 59 and 60 for introducing additional components C and D into the post-mixer chamber 32 via inlets 162 and 64 when the plunger 34 is retracted. It can be included.

Figures 1-4 show the mixing device in the open mixing position. First components A and B7i: metering pumps PA and PB (
(Figure 2), approximately 105.45 to 210.997
/cnl”(1500-80001)Si)17.)J
Inlets 46 and 48 are fed with JE power. 3 and 4 show the flow n of the mixed substance. For simplicity, injection devices 42 and 44 have been omitted from this drawing. Components A and B enter the mixing chamber through openings 52 and 58 at relatively high velocities.

After this, the flow n of the mixed material is at a relatively high velocity (6,1 to 15
,．． 2 m7 seconds, 20-50 ft/sec], leaves the mixing chamber 22, crosses the transfer distribution chamber 12, and collides with the rear mixer chamber a2.

In the post-mixer chamber 82, the flow is transferred to the cleaning plunger 8.
A high degree of agitation is achieved with a 180° deflection at the front face 85 of 4. The mixed material is statistically recirculated several times in the area shown in FIGS. 3 and 4, and finally in the transfer distribution chamber 12.
[Exit] 3. As shown in the figure, in addition to the impinged mixing in the post-mixer chamber 82, the mixed material flows above the cross-flow from the mixing chamber z2 as soon as it exits the post-mixer chamber 82t and returns to the transfer distribution chamber 12. After placing it in the distribution chamber 1
The flow must flow around the cross-flow while moving towards the outlet 18 of the two. Agitation is therefore enhanced by the interaction of the backflow in the post-mixer chamber 82, the co-current mixture in the chamber 820, and the exit and cross-flow mixture in the chamber 12.

The transfer and distribution chamber 12 is designed to be of sufficient length so that the mixed reactants change from agitated to laminar flow conditions before reaching the outlet. The discharge speed is approximately 0.61-1.52 m/s (2-5
ft/sec) and can be lower depending on volume and flow area.

If the mixing device is provided with inlet nozzles 62 and 64, additional components can be introduced into the agitated mixture in chamber 32. Additives of this type can include colorants, catalysts, blowing agents, air or nitrogen. At the end of the dispensing cycle, the operation is interrupted by first moving the mixing chamber plunger 24 to the 1" position.

In this way, the openings 52 and 58 are closed and the injection devices 42 and 44 begin to undergo M circulation.

The apertures of the mixing chamber 22 are mechanically forced to a force of γ1° by extruding the reaction mixture to a depth vi of the chamber 22. After supplying components A and B to 1 u1, the mixer plunger 34 is actuated and pressed 2 (I).
Move it to the ff position. Similarly, the plunger 84 pushes out n
Then, the post-mixing conditioner 32 is cleaned and the mixed volume is pushed out to the transfer/distribution chamber]2. If additional components are introduced via inlets 59i2 and 60, plungers 34.? Extrusion further interrupts the supply of such components. Finally, when plungers 22 and 84 are moved to discharge the transfer-dispensing chamber 12, the transfer-dispensing plunger 14 is moved to its extruded position to force the remaining mixed reactants out of the transfer-dispensing chamber 12.

In this way, plungers 24.84 and 14
The mixed reactants are effectively removed and the equipment is cleaned for the next cycle.

To reset the sexual (open type) or dispensing (closed type) operation, retract plunger 4, and after a while,
The cleaning plunger 84 of the rear mixer chamber 32 and the cleaning plunger 24 of the mixing chamber 22 are retracted.

This immediately initiates the impingement of the anti-J center component in the mixing chamber 22 via the openings 52 and 58. When supplying additional components via inlets 59 and 60, plungers 24 and 84 are preferably retracted simultaneously. The successive operation of plungers 14.24 and 84 described above generally takes place in a few tenths of a second. Therefore, it is preferable to use an automatic continuous timer control 70 to control the start and end of mixing.

Activation of control 70 to start and stop mixing can be performed by a ft'1' controlled operator or automatically. When the control 70 is activated, pressurized fluid is supplied to the inlet ports 19 and 20 in an appropriate order;
29 , 3 (1; and to supply 39.40,
Electrical, pneumatic or other control signals actuate the hydraulic valve control 72.

The invention is not limited to the embodiments described above, and for example, the axes of the mixing chamber 22 and the rear mixer chamber 82 may be parallel to each other, and the mixing chamber 22 may be arranged in a circular manner.
is located on the same side at the bottom of the rear mixer chamber 82.
A change in t L to direct the flow of the premixed material toward the rear chamber can help optimize the agitation effect.

[Brief explanation of the drawing]

1 is a cross-sectional view of an embodiment of a mixing device according to the invention in an open position for mixing and dispensing; FIG. 21A is a cross-sectional view taken at 2-2 in FIG. 1; Figures 3 and 4 show the flow rL of the mixed substance passing through the device.
FIG. 3 is a plan view and a front cross-sectional view showing the pattern. ]0...Mixing head housing 12...Transfer distribution chamber 13...Outlet 14...Cleaning plunger 1 (1...Piston 18...Cylinder 19, 2
0... Donkey 22... Mixing chamber 24,... Cleaning plunger 26... Operating piston 28... Cylinder 29, 30... 1 Donkey 32... Post mixing (?, l
Room i; (4...Cleaning plunger 35...
Front ae...Piston 38...Cylinder s9.4. o... Donkey 42, 4.
4.Injection device 45.Storage tank 46, 48.In [J
50... Plunger 52.53... Nozzle opening 56.58... Recirculation line 59, 6o... Additional σ' inlet 02, 64, Artificial nozzle 70, Automatic M
M timer control 72...Hydraulic valve control - 1 Engraving of drawings (no changes in content) 13 FIG, 1 FIG, 2 Procedural amendment October 2011 1. Indication of incident 1988 f. /r Tank 13 tl 4.0
No. 8 No. 2, Name of the invention Shimada Collision Mixing Device 3, Relationship with the person making the amendment 711 cases 5'1・One person other than Applicant Incorporated Sodo; 11.・5゜

Claims (1)

[Scope of Claims] 1. A housing having an impingement mixing chamber, a rear mixer chamber combined therewith, and a transfer distribution chamber, an r for introducing at least two liquid components into the mixing chamber for impingement mixing. an injection means including a reciprocating plunger for selectively cleaning the mixing chamber; a second injection means installed in the post-mixer chamber for mechanically cleaning and scrubbing the post-mixer chamber; plunger means, third plunger means installed in the transfer and distribution chamber for cleaning the transfer and distribution chamber after a dispensing operation; 8 is placed on the opposite side of the transfer distribution chamber and has an outlet for dispensing the aliquot; the post-mixer chamber is arranged for mixing of the components, and the post-mixer chamber is arranged to alimate the portions across the transfer-dispensing chamber into the post-mixer chamber, and to return the mixed portions to the transfer-distributor chamber for distribution; A high-pressure impingement mixing device for liquid components of at least two citrons.The apparatus according to claim 1, wherein the mixing chamber and the rear mixer chamber are arranged perpendicularly to the transfer distribution chamber. The mixing chamber is larger in cross-sectional area than the mixing chamber, and the mixing chamber is arranged so that the mixed fraction is discharged across the transfer distribution chamber and into the lower part of the post-mixer chamber. g'F The apparatus according to claim 2. 4 The mixed components are introduced into the post-mixer chamber in an agitated state.
Arrange the mixing chamber described in 111 so that the mixed portions are kept in an agitated DIG state; 4. The apparatus according to claim 3, wherein the transfer and distribution chamber is arranged so as to convert the mixed components from an agitated state to a laminar state at a time when the mixed components are distributed through a flow. 5. The post-mixer chamber has at least l points for introducing additional substance components, t!f the device R0 according to claim 2 & a preselected sequence for starting and ending the mixing state. 7. Supplying each of at least two liquid components under pressure to the injection device; +b) supplying each of the at least two liquid components to the injection device; +C) directing the mixture of said components from said mixing chamber to a mixing chamber for tooth-to-edge mixing via a distribution chamber;
Direct the mixture from the rear mixer room back toward the transfer and distribution chamber at the side 1,7J and direct it to the outlet of the transfer and distribution chamber. a method for high-pressure impingement mixing of said at least two liquid components, comprising the steps of: arranging said transfer distribution chamber to distribute in a flow state; (e) distributing said mixture from said outlet; 9. The method according to claim 7, wherein the wheat mixing chamber is arranged perpendicularly to the post-mixing chamber.9.
J1 surface diameter and directing the mixture from the mixing chamber across the transfer distribution chamber to the lower part of the mixing chamber;
J-pointed 1jiJ from the post mixer room to the transfer distribution room
9. A method as claimed in claim 8, in which, before dispensing said mixture 2 in said use a, the mixture is turned around across from said mixing chamber to said post-mixer chamber. 10 Each chamber is mixed with a plunger provided for cleaning each chamber, and the plunger in the mixing chamber, the plunger in the post-mixer V, and the plunger in the transfer distribution γ are operated continuously. General vF to play eJr in the middle
(Claim) Encirclement - ``Method of war as described in Section 118. The method of claim 8, wherein 1 L of said components are injected into said mixing chamber to produce a mixture in laminar flow conditions, and said mixture directed to said post-mixer chamber is maintained in laminar flow conditions. 8. The method of claim 7, further comprising introducing additional ingredients to the mixture in the post-mixer chamber.