JPH02290274A - Coating method and apparatus and coated article - Google Patents

Abstract

PURPOSE:To obtain a coated article uniform in coating distribution within a short time without bringing about the deterioration of substance to be coated by supplying a coating solution while the particulate material supplied to a vibrated plate-shaped body is moved in a concentric circular state or in a whirling state. CONSTITUTION:A plate-shaped body 2 having perforations 3 formed thereto is arranged to the bottom part of a treatment container 1 and an exciter 8 is fixed to the under surface of a bottom wall 7. After a particulate material is charged in the treatment container 1 from a chute 4, the exciter 8 is operated and gas is supplied from a gas supply port 7. Vibration is transmitted to the plate-shaped body 2 from the bottom wall 7 through the side wall of the treatment container 1 by the operation of the exciter 8 to vibrate the plate-shaped body 2. This vibration system is constituted so that the particulate material moves as shown by an arrow while draws an almost concentric circular motion pattern. When a coating solution is sprayed to the particulate material from a spray nozzle 11 through an introducing pipe 12, the particulate material is gradually coated and dried by the gas blown up through the perforations 3.

Description

[Detailed Description of the Invention] [Field of Industrial Use] The present invention is a technology for treating granules, particularly a technology that is effective for coating powders with complex shapes and irregular dimensions. It is related to.

[Conventional technology]

Traditionally, powder bodies have been coated using the so-called coating van, which has been in use for a long time, with forced ventilation (.!\-type rotating drum, or fluidized bed, or its interior). A fluidized bed equipped with stirring blades, a rotating disk, etc., and a liquid spray nozzle attached thereto has been used.

[Problem to be solved by the invention]

However, among the above-mentioned conventional techniques, those using a coating van have an extremely slow drying speed, require a long time for coating, and are susceptible to deterioration of the quality of the powder.5)
In the case of medicines, foods, plant seeds, etc., there was a high risk of quality deterioration.

Furthermore, although the above-mentioned horizontal rotating drum that performs forced ventilation can considerably improve this point, it still cannot eliminate the disadvantage of requiring a long time for drying and the fear of quality deterioration.

Furthermore, since the fluidized bed described above uses an extremely large amount of drying air, the drying speed is extremely shortened, but it has the disadvantage that a uniform coating cannot be obtained for +SrL bodies with irregular shapes and sizes. there were.

On the other hand, if a stirring blade or a rotating disk is installed inside the fluidized bed, although this is somewhat improved, it may damage the surface of the granules coated with the stirring blade. This resulted in another drawback.

Furthermore, all of the above-mentioned conventional apparatuses are batch-type and cannot perform continuous coating. Therefore, many attempts have been made, especially in a fluidized bed, to continuously supply new coated particles from one part and provide an outlet in another part to continuously take out the coated material. Due to the nature of the movement of each particle, it is extremely violent, so v1 particles with an extremely wide coating degree, that is, coverage distribution, including uncoated powder particles, are inevitably discharged from the outlet, resulting in poor quality. There was a drawback that it was inconsistent.

One object of the present invention is to coat a coating material with a uniform degree of coating, that is, with a distribution of degree of deterioration, within a short period of time, without degrading the quality of the material to be coated, and by either a batch method or a continuous method. Our aim is to provide technology that can also be used to

Another object of the present invention is to provide a technique that enables coating at low cost.

An object of the present invention is to provide a technique that can uniformly coat even granules with complex shapes and irregular sizes or shapes5).

Still another object of the present invention is to provide a coating apparatus that does not require a rotary plate, has a simple structure, and can be manufactured easily and inexpensively.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

Means for Solving the Problem] Among the inventions disclosed herein, a brief overview of typical inventions is as follows.

That is, in the coating method using this method, a plate-shaped body provided in a processing container is vibrated, and the granules supplied onto the plate-shaped body are vibrated on the plate-shaped body in a substantially concentric or spiral shape. A coating liquid may be supplied into the processing container while the granules are being moved, and the granules may be coated.

Further, in the coating method of the present invention, the powder or granules can be continuously supplied into the processing container, and the coated granules can be continuously taken out from the processing container.

The coating apparatus of the present invention includes a processing container that accommodates powder and granular material, a plate-shaped body provided in the processing container, a means for supplying a coating liquid into the processing container, and a means for vibrating the plate-shaped body. It can be made up of a vibrating means.

Further, in the coating apparatus of the present invention, at least a part of the plate-like body is made of a porous body, and a gas is passed through the pores of the porous body from below to above the plate-like body. I can do it.

Further, in the coating apparatus of the present invention, a hollow body is provided above the plate-shaped body in the processing container, and a means for spouting a gas body from below to above within the hollow body is provided at a lower part of the hollow body. The coating liquid supply means may be provided to supply the coating liquid from the bottom to the top of the hollow body.

The coated product of the present invention is obtained by any of the coating methods or apparatuses described above.

[Effect]

In the above-mentioned coating method of the present invention, a plate-like body provided in a processing container is vibrated, and the powder and granules supplied onto the plate-like body are vibrated on the plate-like body in a substantially concentric or spiral shape. By supplying the coating liquid into the processing container while moving and coating the granules, the granules are coated while moving in a substantially concentric or spiral shape on the vibrating plate-shaped body. can be applied uniformly.

Further, by continuously supplying the coated granules into the processing container and continuously taking out the coated granules from the processing container, the coating of the granules can be performed continuously and efficiently. be able to.

According to the above-mentioned coating apparatus of the present invention, there is provided a processing container for accommodating the powdered material, a plate-shaped member provided in the processing container, a means for supplying a coating liquid into the processing container, and the plate-shaped member provided in the processing container. By comprising a vibrating means for vibrating the body, coating using vibration can be performed at low cost with an apparatus having a simple structure.

Further, at least a part of the plate-like body is made of a porous body,
A gas body is passed through the pores of the porous body from the bottom to the top of the plate-like body, thereby efficiently drying the coating material with the gas flowing through the pores and performing efficient coating. I can do it.

Furthermore, a hollow body is provided above the plate-like body in the processing container and the vessel, and a means is provided at a lower part of the hollow body for ejecting a gas body from the bottom of the hollow body upward. Since the coating liquid supplying means is provided to supply the coating liquid from the bottom to the top of the hollow body, the coating liquid reliably adheres to the powder and granules in the hollow body and is coated, so that the scattering of the coating liquid is prevented. Loss and consequent waste of coating liquid can be prevented.

Further, the coated product obtained by the coating method and apparatus of the present invention described above can be of uniform quality.

[Example 1] Fig. 1 is a sectional view of a batch-type coating device that is an embodiment of the present invention, and Fig. 2 is a schematic plan view showing the movement pattern of powder and granular material in the coating device of Fig. 1. .

The coating apparatus of this embodiment has a structure that performs batch coating.

This coating apparatus includes a substantially cylindrical processing container 1, and a plate-shaped body 2 in which porous holes 3 are formed in all or part of the processing container 1 is fixedly disposed horizontally at the bottom of the processing container 1. There is.

A gas passage space 4 for supplying a gas for drying and the like is formed below the plate-like body 2, and the gas to this gas passage space 4 is supplied from a gas supply port 5 on the side thereof.

On the other hand, an exhaust port 6 for discharging the gas supplied into the processing container l from the gas supply port 5 through the porous holes 3 of the plate-shaped body 2 is attached to the upper side surface of the processing container lΦ.

Further, on the lower surface of the bottom wall 7 of the gas passage space 4, a vibration exciter 8 as a vibration generator is fixedly installed. This vibrator 8 can be of various types, such as a motor type or an ultrasonic type. The vibrator 8 is for applying vibration to the plate-shaped body 2, vibrates the plate-shaped body 2 through the bottom wall 7 and the side wall of the processing container l, and generates powder particles on the plate-shaped body 2. Coating is performed by moving the body in a substantially concentric movement pattern.

Furthermore, in the upper part of the processing container 1, in this example, the top wall part,
A granular material charging chute 9 for charging the granular material to be coated is provided, and this chute 9 is equipped with a valve IO. The valve lO may be replaced with a damper structure.

On the other hand, in order to supply the coating liquid into the processing container 1,
A spray nozzle 11 is installed above the plate-shaped body 2 in the processing container 1.
is arranged, and the coating liquid is sprayed into the processing container 1 through an introduction pipe 12 connected to the spray nozzle 1l.

In addition, in order to take out the coated granule product,
An outlet 13 is provided in a side wall at the bottom of the processing container 1 at approximately the same height as the plate-like body 2 . This outlet 13 is opened and closed by an outlet damper 14.

Next, the operation of this embodiment will be explained.

First, the valve 10 is opened and the powder to be coated is introduced into the processing container 1 through the powder input chute 9. At this time, if the powder or granular material is so fine as to fall from the porous holes 3 of the plate-like body 2, the powder or granular material is preliminarily connected to the gas passage space 4 and the gas passage space 4 from the gas supply port 5 when introducing the powder or granular material. A required amount of gas may be supplied into the processing container l through the porous holes 3.

After putting the powder into the processing vessel sl, the hull 10
is closed, the vibrator 8 is activated, and a gas is supplied from the gas supply port 5 through the gas passage space 4 and the pores 3 into the processing container 1. This gas body rises inside the processing container 1 and is discharged from the exhaust port 6 to the outside of the system.

When the vibrator 3 is operated, the vibration of the vibrator 8 is transmitted from the bottom wall 7 to the hank-shaped body 2 via the side wall of the processing container 1, causing the temporary body 2 to vibrate. As shown in FIG. 2, the vibration method of the plate-like body 2 is such that the granular material on the plate-like body 2 moves in a substantially concentric movement pattern as shown by the arrows.

While the plate-like body 2 is vibrated in this manner, a coating liquid is sprayed from a liquid source (not shown) through the introduction pipe 12 and toward the vibrating powder on the plate-like body 2 in the processing container 1 using the spray nozzle 11. .

By vibrating and moving the powder and supplying the coating liquid, the powder is gradually coated, efficiently and uniformly coated on the entire surface in a short time, and blown up through the holes 3. Efficiently dried with gas.

In this way, when the coating operation on the powder material reaches a desired degree of coating, the coating liquid is sprayed from the spray nozzle 11 and the plate-like material 2 is sprayed by the vibrator 8.
stop vibrating.

Then, the take-out damper l4 is opened, and the coated product is taken out from the outlet l3.

[Example 2] FIG. 3 is a sectional view of a continuous coating device according to another embodiment of the present invention, and FIG. 4 is a schematic plan view showing the movement pattern of powder and granular material in the coating device of FIG. 2. .

The coating apparatus of Example 2 differs from the batch type apparatus of Example 1 in that it has a continuous structure.

That is, in the second embodiment, since it is necessary to continuously supply powder and granular material, the powder and granular material charging chute 9a has a pond whose lower end is suspended close to the plate-like material 20 in the processing container 1;
Rotary valve lO instead of valve 10 in Example 1
A hopper 15 is provided at the upper end of the shoe 9a for storing a required amount of powder or granular material.

The structure of the second embodiment other than the above is substantially the same as that of the first embodiment. However, in the second embodiment, since it is necessary to continuously take out the coated powder product, the take-out damper 14 is used for the coating operation. The inside is always open.

Next, the operation of the second embodiment will be explained.

In this embodiment 2, the powder to be coated is transported from the hopper 15 through the rotary valve 10a, the powder official's shoe 9a, and onto the plate-shaped body 2 forming the bottom of the processing container 1 at a constant speed. Continuously supplied. The plate-like body 2 is constantly vibrated by a vibrator 8 so that the powder on the plate-like body 2 rotates approximately concentrically. A gas body is constantly introduced through the gas supply port 5 , passes through the pores 3 of the plate-shaped body 2 , rises inside the processing container 1 , and is exhausted through the discharge port 6 .

The coating liquid is continuously passed through the introduction pipe 12 and sprayed onto the powder on the plate-shaped body 2 via the spray nozzle 1l.

While the powder and granules move and transfer on the plate-shaped body 2 in a substantially concentric spiral motion pattern as shown in FIG. While being dried by the increasing gas flow, it is continuously taken out to the outside through the take-out damper 14 and through the take-out port 13.

The powder and granules on the plate-shaped body 2 move in approximately concentric circles as shown in Fig. 2, and are discharged from the take-out port 13 to a certain amount and supplied from the central part to the same amount. As a result, as shown in FIG. 4, the robot moves in a substantially concentric spiral.

In this example, a uniformly coated granule product can be obtained continuously and efficiently.

[Embodiment 3] FIG. 5 is a sectional view showing a continuous coating apparatus which is still another embodiment of the present invention.

The coating apparatus of the third embodiment is similar to the second embodiment shown in FIG. 3 in that it has a continuous structure, but the difference from the second embodiment shown in FIG. One or more hollow bodies 16 are provided, and a spray nozzle lla and a gas blowing pipe 17 are provided upwardly at the lower end of the hollow body 16, and a processing container is provided upwardly from the bottom inside the hollow body 16. The point is that it is made so that it can be adjusted so that the gas flows at a faster rate than in the inside. In this embodiment, the hollow body 16 is attached to and supported by a support 18 on the top wall of the processing container 1 .

The powder to be coated is continuously fed in the same manner as in Example 2 shown in FIG. When it reaches the point, it rises inside the hollow body 16 riding on the faster gas flow inside the hollow body 16.

While ascending within the hollow body 16, the powder is coated with a coating liquid jetted from a spray nozzle 11a provided upward at the bottom of the hollow body 16.

The coated +91 reached the upper end of the hollow body 16
The body falls onto the plate-like body 2 along the outside of the hollow body l6, and is again moved in a substantially concentric spiral shape by vibration,
Finally, it is discharged to the outside from the outlet 13 via the outlet damper 14.

According to this third embodiment, there is an advantage that the scattering loss of the coating liquid sprayed from the spray nozzle lla can be reduced.

J5, the gas blowing pipe 17 may be configured as a two-fluid nozzle together with the spray nozzle l1a, or may be configured as a so-called air spray structure without using a gas blowing pipe in particular.

Next, experimental examples and comparative examples of coating conducted by the present inventors using the coating apparatus of the present invention will be described.

Experimental Example 1 As a coating apparatus, the batch type coating reinstallation shown in Example I in FIG. 1 was used. That is, a coating apparatus was manufactured from stainless steel in which the processing vessel 1 had a diameter of 450+ nm and a height of 550 nm, and the plate-shaped body 2 was a plate with pores 3 of a diameter III full on one side, and
As the coating liquid, a liquid obtained by dissolving Sevillet #100IG (manufactured by Sepik, Paris, France), which is a coating material for plant seeds, in 8% water at once was used. 2 kg of sweet corn seeds are placed in the processing container 1,
The vibrator 8 is operated to move the seeds in a substantially concentric circle on the plate-shaped body 2, and the air heated to 40°C is transferred to the processing container 1.
The plate-shaped body 2 was
Air was blown from below. Next, a metering pump was used to apply 75 mj of the coating liquid to the spray nozzle 11, which was sending compressed air at 0.5 kg/colG. The spray was sent at a speed of 1/min, and was sprayed onto sweet corn seeds that were being transferred while moving in a substantially concentric circle on the plate-shaped body 2. After only 8 minutes, uniformly coated and dried sweet corn seeds were obtained.

Experimental Example 2 Instead of the sweet corn seeds of Experimental Example 1, spinach seeds were used, and the coating material Sebireto #10 was used.
Using Sepilenoto #1034G instead of 01G, the operation was carried out under exactly the same conditions as in Experimental Example 1, and uniformly coated spinach seeds were obtained.

Experimental Example 3 As a coating apparatus, the continuous type coating apparatus in the embodiment shown in FIG. 3 was used. That is, a coating device in which the processing container 1 has a diameter of 600 mm and a height of 650 mm, and the plate-shaped body 2 is a plate with porous holes 3 with a diameter of 1 mm is manufactured from stainless steel, is used, and spinach is coated in advance. 3 kg of seeds were planted. As the coating liquid, a liquid obtained by dissolving seed coating material Sevillet 81034G (manufactured by Sebic, Paris, France) in water to a concentration of 6% was used. 2 spinach seeds in hopper l5
0 kg was put therein, and the rotary valve tOa was adjusted to continuously feed into the processing container 1 at a rate of 500 g/min.

On the other hand, the coating liquid was sprayed at the same air pressure as in Experimental Example 1, and the liquid velocity was adjusted to 45 m/min using a metering pump. In addition, air heated to 40°C has a cylinder velocity of 1
, 3 m/sec. about 12
After a few minutes, uniformly coated seeds started to be discharged and from then on, uniformly coated seeds were obtained continuously.

Experimental example 4 Instead of spinach seeds in fruiting example 3, diameter 8
mlI1, lactose mock tablets weighing 180 mg per tablet were passed through an aqueous solution containing 8% of Japanese Pharmacopoeia hydroxy/propyl methylcellulose and 0.8% of polyethylene glycol as a coating liquid, and the air temperature was set to 80. The operation was performed in exactly the same manner as in Experimental Example 3, except that the temperature was changed to ℃. After about 7 minutes, uniformly coated tablets were continuously obtained.

Comparative Example 1 As a coating device, a fluid coating device (Freund Sangyo Flow Coater FL-15 type. Diameter:
550mm, porous material: stainless steel wire mesh) to be coated; a screw feeder for continuously feeding the JrL body and a screw feeder for continuously taking out the coated powder and granules. After that, the same procedure as in Experimental Example 3 was carried out. However, even after 2 hours, there were still hardly any uncoated particles mixed in, and a uniformly coated proboscis could not be obtained.

As above, the invention made by the present inventor has been specifically explained based on Examples, but the present invention is not limited to the Examples, and it is understood that various changes can be made without departing from the gist of the invention. Needless to say.

For example, the pores 3 of the plate-like body 2 may be formed on the entire surface or a part of the plate-like body 2, and in some cases, for example, when drying is not required, the pores 3 may be non-porous.

Further, the plate-like body 2 may be a metal plate, or may be a wire mesh, a perforated plate such as a porous sintered plate, or the like.

Furthermore, the gas body in the present invention may be a gas body that has been dehumidified in advance, such as dehumidified air, in addition to a heated gas body.

In the above explanation, the invention made by the present inventor is mainly applied to coating of plant seeds, which is its field of application, but it is not limited to this. It can also be applied to powder coating.

〔Effect of the invention〕

Among the inventions disclosed in this application, the effects obtained by typical inventions are briefly described below.

(1). A plate-like body provided in a processing container is vibrated, and the powder and granules supplied onto the plate-like member are moved approximately concentrically or spirally on the plate-like member by vibration, and the coating liquid is poured into the processing container. By supplying the powder and coating the powder, it is possible to obtain a powder product, that is, a coated product, which is coated uniformly throughout.

(2) According to [1] above, coating can be performed at low cost.

(3). According to (1) above, coating can be smoothly performed in a short period of time without deteriorating the quality of the object to be coated.

(4) According to (1) above, it is possible to uniformly coat even powder particles having a complicated shape and irregular size or shape.

(5) According to (1) above, it is possible to coat powder and granules smoothly without damaging them, and in particular, it is possible to coat powder and granules that are unsuitable for damage or extreme stirring, such as plant seeds, etc. I can do it.

(6) By continuously supplying the powder and granules into the processing container and continuously taking out the coated powder and granules from the processing container, continuous imitation is highly efficient. Coating can be performed.

(7) A processing container for accommodating powder and granular material, a plate-like body provided in the processing container, a means for supplying a coating liquid into the processing container, and an excitation means for vibrating the plate-like body. By using this structure, uniform coating using vibration can be performed at low cost with a simple structure.

(8). According to (7) above, since the device has no rotating parts, it is easy to manufacture and is low cost.

(9). At least a part of the plate-like body is made of a porous body, and a gas body is caused to flow from the bottom to the top of the plate-like body through the pores of the porous body, so that the gas is distributed from the pores of the plate-like body. You can efficiently coat the coating while drying it with your body.

α0. A hollow body is provided above the plate-like body in the processing container, and a means for ejecting a gas body from below to above the hollow body is provided at a lower part of the hollow body, and
Since the coating liquid supply means is provided to supply the coating liquid from the bottom to the top of the hollow body, the coating liquid is reliably attached to the powder inside the hollow body, thereby preventing the coating liquid from scattering. Coating can be performed without wasting the coating liquid.

III). According to the coating method and apparatus of the present invention, a uniform and homogeneous coating can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a batch-type coating device that is an embodiment of the present invention, FIG. 2 is a schematic plan view showing the movement pattern of powder and granules in the coating device of FIG. 1, and FIG. FIG. 4 is a schematic plan view showing the motion pattern of the coated particles in the coating device of FIG. 2, and FIG. 5 is a further embodiment of the present invention. FIG. 2 is a sectional view showing a continuous coating device. ■... Processing container, 2... Plate body, 3... Porous, 4... Gas passage space, 5... Gas supply. Port, 6...Discharge port, 7...Bottom wall, Patent

Claims (1)

[Claims] 1. A plate-shaped body provided in a processing container is vibrated, and the powder and granular material supplied onto the plate-shaped body is moved in a substantially concentric or spiral shape on the plate-shaped body by the vibration. A coating method characterized by supplying a coating liquid into the processing container and coating the powder or granules. 2. Continuously supplying the powder and granular material into the processing container,
2. The coating method according to claim 1, further comprising continuously taking out the coated powder from said processing container. 3. A processing container for accommodating a powder or granular material, a plate-shaped body provided in the processing container, a means for supplying a coating liquid into the processing container, and an excitation means for vibrating the plate-shaped body. Coating equipment characterized by: 4. The coating according to claim 3, wherein at least a part of the plate-like body is made of a porous body, and a gas is passed through the pores of the porous body from below to above the plate-like body. Device. 5. A hollow body is provided above the plate-like body in the processing container, and a means for ejecting a gas body from below to above the hollow body is provided in the lower part of the hollow body, and the coating 5. The coating apparatus according to claim 3, wherein a liquid supply means is provided to supply the coating liquid from the bottom to the top of the hollow body. 6. A coated article coated by any one of the coating method according to claim 1 or 2 or the coating apparatus according to claim 3, 4 or 5.