KR100769298B1 - An agitator, a circulatory cleaning device attached to the agitator, and a circulatory line system comprising the circulatory cleaning device - Google Patents

Abstract

The present invention relates to a stirring apparatus which is excellent in mixing dispersibility, cleaning property, and the like of various treatment liquids, fluctuations in liquid amount, treatment liquids having different viscosity from low viscosity to high viscosity, and improved cooling efficiency. A rotating shaft 3 installed vertically therein; And a flat paddle blade (4) attached to the rotating shaft (3), wherein the flat paddle blade includes a bottom flat paddle blade portion (4a) extending laterally from the bottom of the rotating shaft (3), and a bottom flat paddle blade portion ( An upper flat paddle blade portion 4b having a rectangular shape extending upward from both upper ends of 4a), the inner diameter a of the stirring vessel 2 and the wing diameter of the bottom flat paddle blade portion 4a. The dimension ratio (b / a) of (b) is 0.6-0.9, and the dimension ratio (d /) of the height c of the bottom flat paddle blade part 4a and the height d of the upper flat paddle blade part 4b. c) is 1-4, and the flow path 12 for a refrigerant | coolant passes in the inside of the rotating shaft 3 and the flat paddle blades 4 is formed.

Stirring vessel, rotating shaft, flat paddle blade, bottom flat paddle blade portion, top flat paddle blade portion, flow path

Description

Circulation line system having a stirring device, a circulation cleaning device attached to the stirring device, and a circulation cleaning device {AN AGITATOR, A CIRCULATORY CLEANING DEVICE

1 is a longitudinal sectional view showing one embodiment of a stirring device according to the present invention;

Figure 2 is a partially omitted longitudinal cross-sectional view showing the internal configuration of a flat paddle blade that is a component of the stirring device of Figure 1;

Figure 3 is a longitudinal sectional view showing the stirring device of Figure 1;

4 is a cross-sectional view taken along the line A-A of FIG.

5 is a cross-sectional view taken along the line B-B in FIG.

FIG. 6 is a cross-sectional view showing another form of the flat paddle blade which is a component of the stirring device according to the present invention, and corresponding to the cross section taken along the line B-B in FIG.

7 is an explanatory view showing the action of a flat paddle blade as a component of the stirring device of FIG.

8 is a cross-sectional view showing a state of use of a conventional flat paddle blade.

9 is a system diagram showing an embodiment of a circulation cleaning apparatus and a circulation dispersion system including the same according to the present invention.

10 is a longitudinal sectional view showing a dispersing apparatus included in the system of FIG.

FIG. 11 is a cross-sectional view taken along the line A-A of FIG. 10;

* Description of the symbols for the main parts of the drawings *

1: stirring device 2: stirring tank

2a: jacketed cooler 3: rotary shaft

4: flat paddle blade 4a: lower flat paddle blade portion

4b: upper flat paddle blade portion 5: treatment liquid supply port

6: Treatment liquid outlet 12: Euro

14: second pump 15: dispersing device

16: Circulation Dispersion Pipe 17: Second Directional Valve

18: 3rd direction switching valve 19: product tank

20: cleaning liquid tank 21: cleaning nozzle

22: circulating cleaning pipe 23: the first direction switching valve

24: first pump 32: supply port

33: supply discharge tank 34: rotor

36: Euro 37: centrifugal separator

38: impeller 39: opening for circulation

60: stator 80: circulation cleaning device

100: circulation dispersion system X: annular gap

The present invention relates to an agitator, a circulation washing apparatus attached to the stirring apparatus, and a circulation line system having the circulation cleaning apparatus.

BACKGROUND ART Conventionally, coloring liquids such as paints and inks are generally used in combination with pigment paste in clear varnishes. Pigment paste generally contains raw materials such as pigments, resins, organic solvents, etc., is mixed in a stirring apparatus to form a mill base, and the mill base is a bead mill dispersing apparatus. It is manufactured through the process of disperse | distributing a pigment through several times through continuous dispersing apparatuses, such as these.

Specifically, the untreated pigment paste stored in the feeding vessel is supplied to the dispersing apparatus, and the pigment paste obtained by dispersing in the dispersing apparatus is once stored in a receiving vessel, and the first pigment dispersion treatment is completed. Afterwards, the process of dispersing the pigment paste stored in the receiving tank back into the dispersing device and storing the pigment paste treated with the second pigment dispersion back to the original supply tank and storing the pigment paste by repeating these treatments a plurality of times is common. It was adopted. However, in the manufacturing process, two vessels, a supply tank and a receiving tank, are required, and a switching operation with these tanks is required.

For this reason, a technique has been proposed in which a supply tank and a receiving tank are united by connecting a stirring apparatus and a dispersing apparatus in a circulation line and circulating pigment paste between both apparatuses (see, for example, Patent Document 1 and Patent Document 7 below).

Conventional beads mill apparatus (see Patent Documents 1 to 3) having a device for separating the pigment paste and the dispersion medium by the action of the centrifugal force generated by the rotation of the rotor has a high processing capacity (flow rate) and is capable of circulation dispersion. Therefore, one tank is required, and since the one tank is required, there is an advantage that the switching operation between the supply tank and the receiving tank is not required.

However, even when the pigment dispersion mixing treatment is performed using the above-mentioned bead mill apparatus, if the stirring mixing in the stirring apparatus is not sufficient, the mill base is introduced through the stirring apparatus (for example, anchor type or propeller type). And there is a possibility that short-path (short-path) when flowing out, and there is a problem that the efficiency of pigment dispersion is lowered if there is a residual portion in the tank where the flow is not desired.

Accordingly, a double-shafted mixer has been developed with a high speed stirrer and a low speed anchor type stirring blade which scrapes off the mill base retained on the rough wall to improve the efficiency of the stirring mixing in the stirring apparatus.

However, since the two-axis mixer is expensive to install and the gap between the rough wall and the anchor-type stirring blade is narrow, it is difficult to clean the mill base by spraying a cleaning solvent, and thus, when applied to the production of paints that frequently replace varieties, there is a problem in cleaning performance. Occurs.

In addition, for example, a uniaxial mixer has been proposed as a conventional technique in addition to the stirring device (see, for example, Patent Document 4 and Patent Document 5), but these stirring devices are suitable for simply mixing the processing liquid in the tank uniformly. In this case, the treatment liquid is sent from the return pipe installed at the upper part of the tank to the inside of the tank, and discharged from the lower part of the tank, and the discharged treatment liquid is used as a circulation dispersion system that returns to the return pipe through the dispersing device. As the circulation flow is faster, the treatment liquid supplied from the return pipe is discharged from the lower part of the tank in an instant, so there is a problem in that a short circuit occurs without mixing in the tank. In addition, the effect of scraping and circulating the mixed solution of the inner wall surface of the stirrer by mixing is lower than that of the anchor type stirring blade. Therefore, the pigment paste having high structural viscosity easily stays on the wall surface of the tank, making it difficult to stir the mixing. there was.

In order to solve the above problems, the present inventors can improve the configuration of the paddle blades and can be applied to a large flow circulation system, and various treatment liquids, fluctuations in liquid volume, mixed dispersibility or fineness of treatment liquids having different viscosities from low viscosity to high viscosity. The stirring device which was excellent in quality etc. was proposed (refer patent document 6).

In addition, in the process of manufacturing coloring liquids such as paints, small quantities of various kinds are often produced, and it is necessary to clean the site where the stirring tank and other pigment pastes come in contact with each color change. In a conventional cleaning process, for example, a cleaning tank The washing | cleaning apparatus which injects a washing | cleaning liquid from the washing nozzle connected to the stirring tank is known (for example, refer patent document 6). The cleaning apparatus is configured to spray the cleaning liquid in the cleaning liquid tank from the cleaning nozzle in the form of a shower to wash off the pigment paste attached to the inner wall of the stirring vessel or the surface of the stirring blade. The washing liquid injected from the washing liquid nozzle into the stirring vessel is immediately withdrawn from the bottom of the stirring vessel, collected and recycled.

[Patent Document 1] Publication No. 8-266880

[Patent Document 2] Japanese Patent Application Laid-Open No. 6-28745

[Patent Document 3] Japanese Patent Application Laid-Open No. 2002-204969

[Patent Document 4] Publication No. 3224498

[Patent Document 5] Publication No. 1-3-3717

[Patent Document 6] Publication No. 3189047

[Patent Document 7] Publication No. 2002-306940

However, in the beads mill, the heat of the pigment paste increases because the amount of heat generated by friction between the dispersion medium and the rotor or bath and friction between the dispersion mediums is larger than that of the beads mill. Pigment paste may be deteriorated by the temperature rise, the amount of heat generated by the pigment paste has a problem that increases as the viscosity increases.

Therefore, to solve the above problems, the first object of the present invention is to improve the flat paddle blades and agitation tank according to the improved stirring device proposed by the present inventors to improve the cooling efficiency mainly. It is to provide a stirring device.

In addition, the conventional improved stirring apparatus proposed by the inventors of the present invention can clean the flat paddle blades and the inner wall of the stirring vessel by circulating the cleaning liquid, and since the flat paddle blades are employed, the cleaning properties are higher than those of the conventional biaxial mixer. Although much better, it was slightly difficult to remove the pigment paste adhering to the circumferential end surface (flat surface) of the edge of the flat paddle blade or the pigment paste adhering to the bottom of the stirring vessel.

In the case of washing the conventional improved stirring device, for example, the washing liquid is collected in the stirring tank and the flat paddle blade and the inner wall of the stirring tank are washed by rotating the flat paddle blade forward and backward. At this time, the cleaning liquid is circulated at the same time by circulating a circulation path connecting the bead mill and the stirring device.

As a result of extensive research, the present inventors have found that in the prior art including the conventional improved stirring device, since the peripheral edge of the stirring blade is a flat surface as shown in cross section in FIG. The pigment paste adhering to the flat surface easily remains, the dispersing performance is lowered, and the pigment paste adhering to the flat surface of the stirring blade is easy to adhere, and cannot be sufficiently cleaned even with the cleaning liquid sprayed from the cleaning nozzle.

In addition, the inventors of the present invention is supplied from the processing liquid supply port installed in the upper portion of the stirring tank and discharged from the processing liquid discharge port installed in the bottom, the flow of the cleaning liquid circulating the stirring device and the bead mill device through the circulation path with the bead mill device We found that we might stay at the bottom, too.

Accordingly, a second object of the present invention is to provide a stirring device which improves the cleanability of a paddle blade and a stirring tank.

Moreover, in the conventional washing | cleaning apparatus which wash | cleans a stirring tank etc., a large amount of washing | cleaning liquid was needed until sufficient washing | cleaning was obtained.

In addition, when the agitator and the disperser are connected by pipe, cleaning is required due to disassembling the pipe so that the cleaning liquid does not remain in the pipe when changing the color, etc., which requires a lot of effort, and the production cost is remarkable. To rise.

Accordingly, a third object of the present invention is to provide a circulating washing apparatus which can reduce the amount of cleaning liquid used.

In addition, a fourth object of the present invention is to provide a circulation line system in which a stirring device and a dispersing device are connected to a pipe, which reduces the amount of cleaning solution used and reduces the effort for cleaning.

In order to achieve the first object, the stirring device according to the present invention includes: a stirring tank having a processing liquid supply port at the top, a processing liquid discharge port at the bottom, and having a cylindrical shape; A rotating shaft installed vertically in the stirring tank; And a flat paddle blade attached to the rotating shaft, wherein the flat paddle blade has a bottom flat paddle blade portion extending laterally from a bottom of the rotating shaft, and a rectangular shape extending upward from both upper ends of the bottom flat paddle blade portion. The upper flat paddle blade portion of the form, wherein the ratio (b / a) of the inner diameter (a) of the stirring vessel and the blade diameter (b) of the bottom flat paddle blade portion is 0.6 to 0.9, the height of the bottom flat paddle blade portion (c) and the dimension ratio (d / c) of the height (d) of the upper flat paddle blade portion is 1 to 4, characterized in that the flow path for passing the refrigerant through the rotating shaft and the flat paddle blade, characterized in that formed do.

Preferably, the stirring device further includes a jacket cooler around the stirring tank.

In addition, in order to achieve the second object, the stirring device according to the present invention includes: a stirring tank having a processing liquid supply port at the top, a processing liquid discharge port at the bottom, and having a cylindrical shape; A rotating shaft installed vertically in the stirring tank; And a flat paddle blade attached to the rotating shaft, wherein the flat paddle blade has a bottom flat paddle blade portion extending laterally from a bottom of the rotating shaft, and a rectangular shape extending upward from both upper ends of the bottom flat paddle blade portion. An upper flat paddle blade having a shape, wherein the flat paddle blade has a certain thickness, the peripheral portion of the flat paddle blade is characterized in that the end is pointed by the inclined surface formed on both sides of the flat paddle blade.

The circumferential edge of the flat paddle blade has a V-shaped cross section by the inclined surface, and each of the inclined surfaces has an angle ( θ 1) formed with the flat surface of the flat paddle blade within a range of 100 ° to 140 °. It is preferable that it is done.

The bottom of the stirring tank is formed in a conical shape or a cone of a narrow bottom side, the bottom flat shape of the bottom flat paddle blade portion is preferably formed parallel to the bottom of the stirring tank through a predetermined gap.

It is preferable that the bottom conical surface of the said stirring tank has the inclination ( theta ) 2 with a horizontal surface of 5 degrees-30 degrees.

The dimension ratio (e / b) of the wing diameter b of the bottom flat paddle blade portion and the width e of the upper flat paddle blade portion is preferably 0.05 to 0.2.

In addition, the circulation cleaning device according to the present invention to achieve the third object of the present invention, the circulation cleaning device attached to the stirring device for stirring the pigment paste, the cleaning liquid tank for storing the cleaning liquid; A first pump for sucking the cleaning liquid in the cleaning liquid tank and supplying the cleaning liquid to the stirring tank; The suction port of the second pump is connected to the discharge port provided at the bottom of the stirring tank, the discharge port of the second pump is connected to the circulation cleaning pipe, and the circulation cleaning pipe has a second pump connected to the supply port of the cleaning liquid tank. It is characterized by.

In the circulating washing apparatus, it is further provided with a waste liquid tank receiving the washing waste liquid, and installing a first direction switching valve in the circulating washing pipe for converting the discharge liquid from the second pump into the waste liquid tank. desirable.

In addition, the circulation dispersing system according to the present invention to achieve the fourth object of the present invention, the circulation cleaning device; The stirring device having a stirring blade and a stirring tank; A circulation device having a dispersion device for dispersing the aggregate of pigments composed of secondary particles as a primary particle in the pigment paste, and switching the second direction switching valve to switch the discharge liquid from the second pump to the dispersion device. It is installed in the washing pipe, characterized in that the outlet of the dispersing device and the supply port of the stirring vessel is connected by a circulation distribution pipe.

A circulation diverter system, comprising: a product tank provided with a pigment paste that has been dispersed, and having a third direction switching valve for discharging the discharge liquid from the second pump to the product tank in the middle of the circulation dispersion pipe. It is desirable to install it.

The dispersing apparatus of the circulation dispersing system is configured to perform a dispersion between a supply vessel having a supply port for supplying the pigment paste to be dispersed and an outlet for discharging the dispersed pigment paste, and an inner wall of the supply discharge tank. An annular beads mill disposed in the supply discharge tank so as to form an annular gap therein, the outer circumferential surface of which is provided with a cylindrical rotor, and a flow path is formed from the annular gap through the inside of the rotor to the outlet; A centrifugal separator for centrifuging the dispersion medium from the pigment paste is provided in the middle of the flow path, and a circulation opening for sending the centrifuged dispersion medium into the annular gap is preferably formed in the rotor.

The centrifugal separator is preferably provided with a rotating body for centrifuging the dispersion medium, the rotating body is composed of an impeller.

The centrifugal separator is preferably provided with a rotating body for centrifuging the dispersion medium, the rotating body is composed of a rotating disk.

It is preferable that the rotation driving shaft of the rotor is made of a hollow shaft, and the hollow shaft is provided with an outlet opening communicating with the outlet.

A supply port of the supply discharge tank is disposed on one end side of the supply discharge tank, and further includes a substantially cylindrical stator disposed inside the rotor on the other end side of the supply discharge tank, between the stator and the rotor. It is preferable that the gap which constitutes a part of the flow path is formed.

Preferably, a gap is formed in the hollow shaft of the rotor, in which a rotation driving shaft of the rotating body is inserted, and a gap constituting a flow path leading to the discharge opening portion is formed between the inner wall of the hollow shaft of the rotor and the rotating driving shaft of the rotating body. .

Preferably, the rotational drive shaft of the rotor and the rotational drive shaft of the rotor are arranged concentrically.

EMBODIMENT OF THE INVENTION Hereinafter, 1st Embodiment of the stirring apparatus which concerns on this invention is described with reference to FIGS. 1 is a longitudinal cross-sectional view showing the internal structure of the stirring device, Figure 2 is a longitudinal cross-sectional view showing a part of the internal structure of the flat paddle blade portion of FIG.

The stirring device 1 comprises an agitating vessel 2, a rotating shaft 3 vertically installed at the inner center of the stirring vessel 2, and a flat paddle blade as a stirring blade attached to the rotating shaft 3. (4) is provided.

The stirring tank 2 is provided with a treatment liquid supply port 5 at the top, and a treatment liquid discharge port 6 at the bottom, and a circumferential side is formed in a cylindrical shape, and a jacket-type cooler around the ) 2a.

The jacketed cooler can employ a known configuration, and is made to circulate a refrigerant such as cooling water therein. The bottom of the stirring vessel 2 is formed in the form of a truncated cone with a narrow bottom. In addition, the stirring tank (2) is provided with the cleaning liquid supply ports (7, 7) at the top.

The flat paddle blade 4 has a bottom flat paddle blade portion 4a extending laterally from the bottom of the rotation shaft 3, and a rectangular shape extending upward from both top ends of the bottom flat paddle blade portions 4a. It has an upper flat paddle blade portion 4b of the form.

The bottom flat paddle blade portion 4a is formed by an inclined side parallel to the bottom conical surface of the stirring vessel 2, and has a predetermined gap between the bottom flat paddle blade portion 4a and the bottom surface of the stirring vessel 2.

The upper flat paddle blade portion 4b is installed symmetrically with respect to the rotation axis 3. The rotating shaft 3 is driven by the pulley 9, the pulley belt 10, the pulley 11 by a drive device 8 disposed outside the stirring tank, the rotating shaft 3 rotates the flat paddle The blade 4 passes while rotating in the circumferential direction near the inner circumferential wall surface of the cylindrical shape of the stirring vessel 2.

The rotary shaft 3 and the flat paddle blade 4 are formed with a passage 12 for passing the refrigerant through the rotary shaft 3 into the flat paddle blade 4. The flow path 12 formed in the flat paddle blade 4 is preferably formed in the bottom flat paddle blade portion 4a and the upper flat paddle blade portion 4b. As the cooling water as the refrigerant, water cooled to −10 ° to 10 ° by a cooler (not shown) may be used.

In the embodiment of the figure, the inside of the rotating shaft 3 has a double tube structure, and the refrigerant is flat past the flow passage 12 formed by the inner tube 3a, as indicated by the arrow in FIG. After the flow path 12 formed in the paddle blade 4 flows, it is discharged past the flow path 12 formed by the pipe 3b on the outside of the double pipe. A double rotary joint 13 corresponding to the double tube is attached to the upper end of the rotating shaft 3, and the refrigerant may be supplied and discharged from the upper end of the rotating shaft even during the rotation of the rotating shaft 3.

As for the bottom flat paddle blade part 4a, as shown in FIG. 3, the dimension ratio (b / a) of the inner diameter (a) of the stirring vessel 2 and the blade diameter (b) is 0.6-0.9, Preferably it is 0.6. It is comprised so that it may become in the range of -0.8. When the dimension ratio b / a is less than 0.6, since the wing diameter becomes too small compared with the inner diameter of the stirring vessel 2, the pigment paste remaining on the rough wall surface increases, while the dimension ratio b / a is increased. When it exceeds 0.9, short-path of the pigment paste occurs easily because the blade diameter becomes too large compared to the inner diameter of the stirring vessel 2.

In addition, the flat paddle blade 4 has a dimension ratio d / c of the height c of the bottom flat paddle blade portion 4a and the height d of the upper flat paddle blade portion 4b of 1 to 4, preferably Is designed in the range of 1 to 3. When the height ratio d / c of this height is less than 1, that is, the height d of the upper flat paddle blade portion 4b is too small compared to the height c of the bottom flat paddle blade portion 4a, stirring is performed. Due to the increased power of the city, the cost of the product is increased or the machine is burdened, so that the aging is accelerated, and there is a problem that shortage of the pigment paste is likely to occur. On the other hand, when the dimension ratio d / c exceeds 4, that is, when the height d of the upper flat paddle blade portion 4b is too large than the height c of the bottom flat paddle blade portion 4a, There is a drawback in that the pigment paste cannot be mixed uniformly.

In addition, the flat paddle blade 4 has a total height h (d + c) of the flat paddle blade 4 and a dimension ratio h / a of the inner diameter a of the stirring vessel 2, preferably 0.8 to 1.5. It is preferably designed to be in the range of 1.0 to 1.3. When the dimension ratio h / a of this height is less than 0.8, that is, the total height h of the flat paddle blades 4 is too small compared to the inner diameter a of the stirring vessel 2, a short circuit of the pigment paste is performed. This easily occurs problem, on the other hand, if the dimension ratio (h / a) exceeds 1.5, that is, the total height (h) of the flat paddle blade 4 is too large compared to the inner diameter (a) of the stirring vessel (2) In this case, there is a problem in that the pigment paste can not be uniformly mixed in the tank.

The upper flat paddle blade portion 4b of the rectangular shape is a rectangular wing which is long in the height direction, and the width e thereof is the ratio of the size of the blade diameter and the length b of the bottom flat paddle blade portion 4a (e / It is preferable to design so that b) may be in the range of 0.05 to 0.2, preferably 0.06 to 0.15. If the dimension ratio (e / b) is less than 0.05, the effect of scraping off the pigment paste near the inner surface is less, while if it exceeds 0.2, there is a problem that short-circuit of the pigment paste occurs easily.

Moreover, as for the dimension ratio c / b of the height c of the bottom flat paddle blade part 4a, and the blade diameter b, 0.4-1.0 are preferable, More preferably, it is 0.5-0.7. If the dimension ratio c / b is less than 0.4, the stirring effect is lowered. On the other hand, if the dimension ratio c / b exceeds 1.0, the burden on the apparatus increases, and there is a problem that the aging progresses quickly.

The flat paddle blade 4 is preferably composed of one piece. In addition, the material constituting the flat paddle blade 4 is not limited, and materials conventionally used for stirring blades can be used. In particular, stainless steel is preferable in terms of durability and strength, and in terms of cleanability, the surface is mirror-finished ( It is preferable to perform mirror finish or Teflon coating or glass lining on the surface. In addition, when the capacity of the stirring vessel 2 is 500 liters, the thickness of the flat paddle blades 4 is 10-30 mm. Although the capacity | capacitance of the agitation tank 2 is not specifically limited, Usually, it exists in the range of about 2 liters-about 10000 liters.

According to the second embodiment of the present invention, the flat paddle blades 4 are formed by the inclined surfaces 4c and 4c formed at both sides of the flat paddle blades at their entire circumferential edges, as shown in the cross-sectional form of FIGS. 4 and 5. The end is formed in a thin shape, and has a V-shaped cross section. The inclined surfaces 4c and 4c are made of flat surfaces in the examples shown in Figs. 4 and 5, but may be made of curved surfaces as shown in the cross-sectional view of Fig. 6. In addition, the tip of the thin end formed by the inclined surfaces 4c and 4c is formed in a pointed shape in the examples shown in FIGS. 4 and 5, for example, as shown in FIG. 6, a round U-shaped cross section. It may be formed in the form. 4 to 6, only the cross-sectional shape of the upper flat paddle blade portion 4b is shown, but the same applies to the bottom flat paddle blade portion 4a.

The stirring device of the first embodiment and the second embodiment is mainly used integrated in a circulation dispersion system connected to a dispersion device.

A preferred embodiment of such a circulation dispersion system will now be described with reference to FIGS. 9 to 11. 9 to 11, in the present embodiment, the circulation cleaning device 80, the stirring device 1, and the circulation dispersion pipe (which are connected to the stirring device 1 and the stirring device 1 by a circulation cleaning pipe) 16, the circulation dispersion system 100 having the dispersion device 15 connected to it will be described as an example.

The circulation cleaning device 80 includes a cleaning liquid tank 20 for storing a cleaning liquid such as a solvent or water; A first pump 24 which sucks the cleaning liquid in the cleaning liquid tank 20 and supplies the cleaning liquid to the cleaning liquid supply ports 21a and 21a of the stirring tank 2; The suction port of the second pump is connected to the processing liquid discharge port 6 provided at the bottom of the stirring tank 2, the discharge port of the second pump is connected to the circulation cleaning pipe 22, and the circulation cleaning pipe 20 The second pump 14 is connected to the cleaning liquid supply port 20a of the cleaning liquid tank 20.

The cleaning nozzles 21 are provided in the cleaning solution supply ports 21a and 21a of the stirring tank 2, and the cleaning solution pumped from the first pump 24 passes through the cleaning nozzle 21. 2) and a high pressure spray in the form of a shower (shower) to the flat paddle blade (4) as a stirring blade.

The cleaning liquid collected in the stirring tank (2) is withdrawn from the treatment liquid outlet (6) of the stirring tank (2) by the second pump (14), and passes through the circulating cleaning pipe (22) again to the cleaning liquid tank (20). Return to.

The circulation cleaning device 80 further includes a waste tank 25 that receives the washing waste liquid, and converts the discharge liquid from the second pump 14 into the waste liquid tank 25 so as to discharge the waste liquid tank 25. 23 is installed in the circulation cleaning pipe 22.

In addition, a second direction switching valve 17 is installed in the circulation cleaning pipe 22, and the second direction switching valve 17 supplies the discharge liquid from the second pump 14 to the dispersing device 15. Can be switched to. The outlet of the dispersing device 15 is connected to the treatment liquid supply port 5 of the stirring vessel 2 by the circulation distribution pipe 16.

A third diverter valve 18 is installed in the circulation dispersion pipe 16, and the third diverter valve 18 discharges the discharge liquid from the second pump 14 to the product tank 19. Convertible, the product tank 19 is provided with a pigment paste that has been dispersed.

The dispersing device 15 is not particularly limited, and conventionally known pigment dispersing devices can be used. Particularly, it is preferable to use a bead mill that can handle a large amount of processing flow rate. Preference is given to annular beads mills with a built-in centrifugal separator which can use a dispersion medium of diameter.

As shown in the cross-sectional view of Fig. 10, the dispersing device 15 is provided with a rotor 34 having a cylindrical outer circumferential surface in a supply vessel 33 in which a supply port 32 is formed. An annular gap (X) for dispersing the pigment is formed between the inner wall of the supply discharge tank 33 and the outer circumferential wall of the rotor 34.

The rotary drive shaft 34a of the rotor 34 is a hollow shaft, and the discharge opening 35 is formed in the hollow shaft. A flow path 36 is formed which opens from the hollow portion 34x of the rotation drive shaft 34a to the bottom of the rotor 34 through the inside of the rotor 34.

The dispersion medium (not shown) is contained in the supply discharge tank 33 in advance, and the particle diameter thereof may be larger than the conventionally used 3 mm, and in addition, a particle diameter of 0.05 to 0.3 mm may be used. have.

In the rotor 34, a centrifugal separator 37 for centrifuging the dispersion medium flowing through the flow path 36 from the pigment paste is disposed. The centrifugal separator 37 in the example shown in the figure employs an impeller 38 arranged to cross the flow path 36. In order to discharge the centrifuged dispersion medium into the annular gap X, a circulation opening 39 is formed in the rotor 34 in communication with the peripheral space of the impeller 38 and the annular gap X.

The impeller 38 may employ a variety of wings, such as flat blades, arrow blades, twisted blades, etc., the action of sucking up in the center of the wing to push in the circumferential direction, That is, it has a function as a centrifugal pump. The rotary drive shaft 38a of the impeller 38 is inserted into the hollow portion 34x of the rotor 34 and protrudes from the rotary drive shaft 34a of the rotor 34. In the drawings, reference numerals 40, 41, and 42 denote sealing members.

As shown in Fig. 11, the impeller 38 is provided with a donut-shaped plate 50 of the central opening on the top surface of the impeller 38. In the gap between the donut-shaped plate 50 and the upper wall of the impeller receiving space of the rotor 34, an annular mechanical seal 51 is provided, as shown in FIG. 10, through which the dispersion medium is formed. Avoid release.

Each of the rotary drive shafts 34a and 38a is connected to a common drive source M through the transmission mechanism 45 in the illustrated example, and the drive sources of the rotary drive shafts 34a and 38a may be connected to the respective drive sources. In the example shown in the figure, the transmission mechanism 45 is a transmission mechanism by a combination of pulleys 45a to 45d and pulley belts 45e and 45f wound around the pulleys 45a to 45d. The electric mechanism of can be adopted.

The flow passage 36 communicates with the central portion of the impeller 38, that is, the portion where the impeller 38 sucks, from the bottom of the rotor 34. The annular gap X, the flow path 36 and the circulation opening 39 communicate with the central portion of the impeller 38 from the annular gap X, and again through the outer circumferential portion of the impeller 38. The circulation path leading to) is constructed.

The stator 60 may be fixed to the center of the inner bottom portion of the supply discharge tank 33, and a flow path may be formed by a gap formed between the stator 60 and the rotor 34. The stator 60 is formed in the form of a flow path in the center of the strongest suction action by the rotation of the impeller 38, thereby further improving the circulation of the dispersion medium and pigment paste in the circulation path. The stator 60 provides a speed difference by the gap between the inner side of the rotor 34 and the outer wall of the stator 60, and also plays a role of distributing the same as the outer circumference of the rotor 34. The stator 60 is formed of a cylindrical body having a truncated cone in the upper part in the example shown in the drawing, and may have various shapes such as a cone shape.

Jackets 61 and 62 are formed at the outer circumferential portions of the supply discharge tank 33 and the stator 60, and cooling water is introduced into the respective jackets 61 and 62 from the water inlets not shown. The water is discharged from the drain port so as to prevent a temperature rise in the supply discharge tank 33.

The geometric dimension ratio of the dispersing device 15 is the internal diameter of the supply discharge tank 33 to 1,

The height H1 of the hollow part in the supply discharge tank 33 is 1.0-2.0

The outer diameter L1 of the stator 60 is 0.5 to 0.7.

The outer diameter L2 of the rotor 34 is 0.95 to 0.98

The width X1 of the annular gap X is 0.02 to 0.05

The clearance X2 between the rotor 34 and the stator 60 is 0.02 to 0.05.

The diameter L3 of the flow path 36 in the portion communicating with the impeller 38 is 0.1 to 0.3

The diameter L4 of the impeller 38 is 0.6 to 0.8

The width H2 of the impeller 38 is 0.2 to 0.3

The inner diameter L5 of the rotary drive shaft 34a of the rotor 34 is 0.3 to 0.4.

The height H3 of the circulation opening 39 is 0.25 to 0.35

The width L6 of the circulation opening 39 is 0.05 to 0.1.

It is preferable to set it as the range of.

In addition, the rotation speed of the impeller 38 is most preferably in the range of 1.5 to 2.0 times the rotation speed of the rotor 34.

Although the said impeller 38 was shown by 1st stage in the said embodiment, it can be provided in 2 or more stages, and can also be comprised by a turbine blade by providing a static guide blade around the said impeller 38. As shown in FIG. As the centrifugal separator 37, a rotating disk (not shown) may be employed instead of the impeller 38. In the case of a rotating disk, it has a smaller function as a suction pump than an impeller, and has a function of applying a centrifugal force to a dispersion medium. In addition, it is not limited to the disk form, it is also possible to employ a rotating body made of various forms that can centrifuged the dispersion medium as it rotates, such as spheres, ellipsoids, cones.

In addition, the impeller may be fixed or integrally formed in the rotor 34 as a centrifugal separator, and the rotating drive shaft of the impeller may be omitted. In this case, the number of revolutions (rotational speed) of the impeller and the number of revolutions of the rotor are the same, so that the centrifugal action can be reduced, but the number of parts can be reduced.

In addition, the rotor 34 can increase the stirring effect by forming a plurality of projections, such as a plurality of pins on the outer peripheral surface.

In addition, the rotation drive shaft 38a of the impeller 38 may extend downward to protrude from the bottom of the supply discharge tank 33.

In the circulation dispersion system having the above structure, the second direction switching valve 17 is switched to supply the discharge liquid from the second pump 14 to the dispersing device side, and the pigment paste mixed and stirred by the stirring device 1 is changed. It is withdrawn from the stirring vessel 2 through the process liquid discharge port 6, is supplied to the dispersing apparatus 15 through the circulation distribution pipe 16 by the drive of the 2nd pump 14, and the dispersing apparatus 15 The pigment paste dispersed therefrom is supplied into the stirring vessel 2 through the treatment liquid supply port 5, and the cycle is repeated by repeating this cycle.

The transfer amount of the second pump 16 for conveying the pigment paste into the dispersing device 15 is appropriately controlled in a range not significantly exceeding the centrifugal separation capacity of the impeller 38 constituting the centrifugal separator.

The pigment paste conveyed to the supply discharge tank 33 is sent downward along the annular gap X between the inner wall of the supply discharge tank 33 and the outer wall of the rotor 34 while being agitated by the rotor 34 together with the dispersion medium. Then, the gap is raised between the bottom of the rotor 34 and the bottom of the supply discharge tank 33 to the gap between the inner wall of the rotor 34 and the outer wall of the stator 60. Then, by the centrifugal pump action of the impeller 38 disposed inside the rotor 34, it is sucked into the impeller 38 from the center of the rotor 34.

The mixture of the pigment paste and the dispersion medium sucked into the impeller 38 is subjected to the centrifugal force by the rotation of the impeller 38 and the rotor 34 outside thereof, and is separated into the dispersion medium and the pigment paste by the specific gravity difference. . The dispersion medium having a large specific gravity is discharged to the outer circumferential portion and returned to the annular gap X between the inner wall of the supply discharge tank 33 and the outer wall of the rotor 34 from the circulation opening 39 formed in the rotor 34. Then, the mixture is mixed with the pigment paste and lowered into the annular gap X between the inner wall of the supply discharge tank 33 and the outer wall of the rotor 34.

In this way, the dispersion medium moves by the flow of the pigment paste from the annular gap X to the flow path 36 inside the rotor, and repeats the circulation returned by the impeller 38 through the circulation opening 39. The aggregated particles (secondary particles) of the pigment blended in the pigment paste therebetween are strongly sheared by collision with the dispersion medium in the annular gap X between the inner wall of the supply discharge tank 33 and the outer wall of the rotor 34. It is dispersed into primary particles by a shearing action.

The pigment paste separated from the dispersion medium by the impeller 38 rises to a gap between the hollow portion 34x of the rotary drive shaft 34a of the rotor 34 and the rotary drive shaft 38a of the impeller 38, It is discharged from the discharge port 33a through the discharge opening part 35 formed in the rotation drive shaft 34a of the rotor 34. The discharged pigment paste is returned to the stirring tank 2 through the circulation distribution pipe 16. By this iterative circulation, circulation dispersion is performed.

After the circulation dispersion is completed as described above, the pigment paste is discharged to the product tank 19 through the third direction switching valve 18, and then the pigment remaining in the stirring tank 2 or the dispersing device 15 is discharged. The paste is cleaned and removed.

Specifically, after discharging the pigment paste into the product tank 19, the first pump 24 is driven to supply the washing liquid from the washing liquid tank 20 to the stirring tank 2. At this time, the initial cleaning is performed by high-pressure spraying the cleaning liquid from the cleaning nozzle 21 in the form of a shower.

When a predetermined amount of the washing liquid is collected in the stirring tank 2, the first pump 24 is stopped and the second pump 14 is driven to mix the stirring tank 2, the dispersion device 15, and the circulation dispersion pipe. The washing liquid is circulated in (16), and circulation washing of the circulation dispersion system is performed. At this time, the washing liquid is collected in the stirring tank 2, and the flat paddle blade 4 and the inner wall of the stirring tank 2 can be cleaned by rotating the flat paddle blade 4 constituting the stirring blades forward and backward. The dispersing apparatus can also be efficiently washed by driving the dispersing apparatus while the cleaning liquid is circulating in the circulation dispersing system.

When the cleaning liquid is contaminated by circulation cleaning and the cleaning liquid does not have a predetermined cleaning capacity, the second direction switching valve 17 and the first direction switching valve 23 are switched to discharge the cleaning liquid to the waste tank 25 once. In addition, a new washing liquid may be added to the washing liquid tank 20 to perform circulating washing of the circulation dispersion system again.

After the cleaning of the circulation dispersion system is finished, the second direction switching valve 17 is switched so that the discharge from the second pump 14 is sent to the cleaning liquid tank 20. The circulation cleaning system circulates through the circulation cleaning system consisting of the pipe 22 and the cleaning liquid tank 20, thereby performing the circulation cleaning of the circulation cleaning system. Also in this case, the cleaning solution may be replaced with a new cleaning solution before the circulation cleaning of the circulation cleaning system. After the rinsing of the circulation cleaning system, the first directional valve 23 is switched to discharge the rinse waste liquid to the waste tank 25.

In the above description, an example in which the circulation cleaning system is cyclically washed after the circulation dispersion system is cyclically washed, may be cleaned first.

The above-described circulation cleaning process can be automatically performed by sequence control. That is, the first to third directional control valves 23, 17 and 18 are solenoid valves, and the first to third directional control valves 34, 17, etc. are automatically executed according to a predetermined continuous control program. 18), the driving and stopping of the first pump 24 and the second pump 14 are controlled by a controller.

At this time, the liquid level in the cleaning liquid tank 20 and the stirring tank 2 is detected by a liquid level sensor (not shown), and the detection signal is also integrated in the control system to drive the first pump 24 and the second pump 14. The cleaning liquid may be circulated to the circulation washing line while controlling the stop. In this case, the circulation of the cleaning liquid is not continuous but can be made intermittently.

Moreover, it is preferable to process a pigment paste in the range of viscosity 0.01 Pa.sec-100 Pa.sec, especially 0.1 Pa.sec-10Pa.sec, TI value 1-10, especially the range of 1-5. The TI value is an abbreviation for thixotropic index, and the value measured by the rotational viscosity method described in JISK5101-6-2 (temperature 20 ° C, rotor rotation speed 6 and 60 rpm) is converted into mPa · s, The apparent viscosity at 6 rpm is also the value computed by mPa * s in mPa * s / 60 rpm.

In addition, when the viscosity of the pigment paste is high or the TI value is high, the adhesion force of the pigment paste is strong, so that the inner wall surface of the stirring vessel 2, the surface of the stirring blade 8, and the inner surface of the pipe are mirror-finished, Teflon coating, Or it is preferable to make it smooth by glass lining.

According to the stirring device having the configuration of the first embodiment, the heat transfer area is large even when the heat transfer rate (cooling rate) is not sufficient by the jacket cooler alone in a pigment paste having a high TI value, a pigment paste having a high viscosity, or the like, and the treatment liquid. Since it can be cooled by the flat paddle blade with a high frequency of contact, cooling efficiency is improved and it can mix in a short time compared with the residence time in the stirring vessel 2. Therefore, when the stirring apparatus of 1st Embodiment is employ | adopted for the said circulation dispersion system, dispersion performance can be improved.

In addition, as shown in the second embodiment, when the peripheral edge portion of the flat paddle blade 4 is formed in a thin shape by the inclined surfaces 4c and 4c formed on both sides of the flat paddle blade, the cleaning liquid is shown in FIG. As shown in the cross-sectional view as in the flow (dashed arrow), the pigment paste adhering to each inclined surface when the flat paddle blade 4 rotates forward and reverse (only one direction in FIG. 7 is shown) It is removed by the flow efficiently.

In addition, in view of such efficiency, when the peripheral edge of the flat paddle blade 4 has a V-shaped cross section by the inclined surfaces 4c and 4c, each of the inclined surfaces 4c is a flat surface (front surface of the flat paddle blade 4). Or it is preferable that the angle ( theta ) 1 (refer FIG. 4) to make with the back surface is formed in the range of 100 degrees-140 degrees. When the inclination angle θ 1 is less than 100 °, the pigment paste is easily adhered to the flat surface. When the inclination angle θ 1 exceeds 140 °, the strength of the flat paddle blade 4 decreases. This is because the shrinkage stress remains on the lining and easily peels off when the fluorine resin coating or the glass lining is applied.

In addition, as described above, the bottom of the stirring tank 2 is formed in the shape of a conical bottom with a narrow bottom, and forms a laminar flow along the inclined surface of the bottom when the cleaning liquid circulates through the dispersion line. The pigment paste adhering to the bottom of is efficiently removed.

From the viewpoint of such efficiency, it is preferable that the bottom conical surface of the stirring vessel 2 has an inclination θ 2 (see FIG. 1) with a horizontal plane of 5 ° to 30 °. When the inclination angle θ 2 is less than 5 °, the pigment paste easily stays around the junction between the main body portion and the bottom of the tank, and it is difficult for the pigment paste to flow to the treatment liquid outlet 6 during circulation cleaning. This is because when the degree θ 1 is larger than 30 °, a short circuit of the pigment paste occurs easily.

The present invention can be cooled by a flat paddle blade having a large heat transfer area and a high frequency of contact with the treatment liquid, thereby providing a stirring device having improved cooling efficiency, and providing a circulation dispersion system with improved dispersion performance. It works.

In addition, the present invention has the effect of more efficiently removing the pigment paste adhered to the bottom.

Claims (11)

A circulation cleaning device installed in a stirring device for stirring pigment paste, A cleaning liquid tank for storing the cleaning liquid; A first pump for sucking the cleaning liquid in the cleaning liquid tank and supplying the cleaning liquid to the stirring tank; And The suction port of the second pump is connected to the discharge port provided at the bottom of the stirring tank, the discharge port of the second pump is connected to the circulation cleaning pipe, the circulation cleaning pipe includes a second pump connected to the supply port of the cleaning liquid tank. doing Circulation cleaner. The method of claim 1, Further comprising a waste tank receiving cleaning waste liquid, The first direction switching valve for switching to discharge the discharge liquid from the second pump to the waste tank is installed in the circulation cleaning pipe Circulation cleaner. Cyclic cleaning device according to claim 1 or 2; The stirring device having a stirring blade and a stirring tank; The circulation cleaning is provided with a dispersing device for dispersing the aggregate of pigments composed of secondary particles as the primary particles in the pigment paste, and switching the discharge liquid from the second pump to supply the dispersing device. It is installed in the pipe for connecting, and the outlet of the dispersing device and the supply port of the stirring tank for connecting by circulation distribution pipe Circulation Dispersion System. The method of claim 3, The product tank is provided with the pigment paste after the dispersion treatment, and the third directional valve is installed in the circulation distribution pipe for switching the discharge liquid from the second pump to the product tank. Circulation Dispersion System. The method of claim 3, The dispersing apparatus is configured to form a feed discharge tank having a supply port for supplying the pigment paste to be dispersed and an discharge port for dispersing the dispersed pigment paste, and an annular gap for dispersing between the supply discharge tank and the inner wall of the supply discharge tank. It is arranged in the supply discharge tank, the outer circumference is made of an annular beads mill having a rotor having a cylindrical shape, A flow path is formed from the annular gap to the outlet through the inside of the rotor, A centrifugal separator for centrifuging the dispersion medium from the pigment paste is provided in the middle of the flow path in the rotor, A circulation opening is formed in the rotor for dispensing the centrifuged dispersion medium into the annular gap. Circulation Dispersion System. The method of claim 5, The centrifugal separator comprises a rotating body for performing centrifugal separation of the dispersion medium, the rotating body is composed of an impeller, The rotary drive shaft of the rotor is made of a hollow shaft, the hollow shaft is formed with a discharge opening communicating with the outlet Circulation Dispersion System. The method of claim 5, The centrifugal separator comprises a rotating body for performing the centrifugal separation of the dispersion medium, the rotating body is made of a rotating disk, The rotary drive shaft of the rotor is made of a hollow shaft, the hollow shaft is formed with a discharge opening communicating with the outlet Circulation Dispersion System. delete The method of claim 5, The supply port of the supply discharge tank is disposed on one side of the supply discharge tank, The cylindrical stator disposed inside the rotor is further provided on the other end side of the bezel, A gap constituting part of the flow path is formed between the stator and the rotor. Circulation Dispersion System. The method according to claim 6 or 7, A rotary drive shaft of the rotor is inserted into the hollow shaft of the rotor, and a gap is formed between the hollow inner circumferential wall of the rotor and the rotary drive shaft of the rotor to form a flow path leading to the discharge opening. Circulation Dispersion System. The method of claim 10, The rotational drive shaft of the rotor and the rotational drive shaft of the rotor is arranged concentrically Circulation Dispersion System.

Images