JP3511032B2 - Fluid granulation coating method and granulation coating apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a granulation coating technique in which a powder or granular material is brought into a fluid state and subjected to treatment such as granulation, coating, mixing or drying.

[0002]

2. Description of the Related Art For example, pharmaceuticals, foods, powder metallurgy materials,
A fluidized bed is used as a granulation coating technique used for performing granulation, coating, mixing, drying, and the like of powders and granules used for catalysts, ferrites, ceramics, detergents, cosmetics, dyes, pigments, toners, and the like. There are mold granulation coating equipment.

The fluidized bed type granulation coating apparatus has a body portion in which a rotating body having a ventilation portion is provided at the bottom,
A flow chamber for supplying powder particles is formed on the upper side of the rotating body, so that the flowing gas is supplied from the flowing gas supply unit provided on the lower side of the rotating unit into the flow chamber through the ventilation unit. There are some that have a basic structure.

There are various types of granulation coating devices of this type, such as Japanese Patent Laid-Open Nos. 54-62978, 61-165577 and 63.
In the apparatus described in Japanese Patent Publication No. 33900, a disk having a flat surface is used as a rotating body.
In the device disclosed in Japanese Patent No. 735, a rotating body having a dish-shaped cross section whose outer peripheral portion is inclined upward is used. Also,
In the device disclosed in Japanese Patent Laid-Open No. 60-183030, a large number of annular plates are concentrically arranged to form a substantially flat rotary plate, and gas is passed around the outer circumference of the rotary plate when passing through the ventilation part. The supply is made diagonally upward. Further, in the device described in Japanese Patent Laid-Open No. 59-49838, similarly, a large number of annular plates are arranged concentrically and vertically offset to each other, and a rotary body having a mountain-shaped cross section is provided. The gas that has passed through the section is horizontally supplied toward the outer peripheral portion.

In the devices disclosed in these publications, the flowing gas is supplied from the lower side of the rotating body through the ventilation part,
Gas is also supplied from the gap between the outer periphery of the rotating body and the inner surface of the body. As a result, the powder and granules in the fluid chamber formed on the upper side of the rotating body are made to flow by adding the rolling action by the rotating body and the flow action by the airflow, and the binder and the coating agent are sprayed onto this. Granulation or coating is performed.

The direction in which the flowing gas is blown out varies depending on the structure of the ventilation part, such as upward, obliquely upward, and horizontal. Further, there are various ventilation parts such as those in which holes are formed so as to blow gas upward or obliquely upward, and those in which wire mesh or slits having a complicated cross section are formed.

[0007]

In the above-mentioned conventional device,
Even if there is a difference in the structure of the ventilation part, in order to prevent the powder or granular material that is the object to be processed from falling below the rotating body, it is a structure in which a large number of openings smaller than the size of the granular material are formed. The powder or granules, the one wet with the binder or the coating agent, or the fine powder generated from the powder or granules, the binder, or the like may adhere to the opening of the ventilation part to cause clogging of the opening.

[0008] Regarding the clogging, conventionally, only the recognition that cleaning after the end of the operation had to be carefully performed was made, and it was left as it is because it was not an important problem.

However, the present inventors have found that clogging has a great influence on the quality and yield of products. That is, deterioration of product quality and yield due to agglomerate generation and generation of defective coating particles are often caused by poor flow state such as drift of flow gas and reduction of wind speed caused by clogging of ventilation part. It became clear.

An object of the present invention is to prevent clogging of the ventilation part and to maintain high yield and to perform high quality treatment.

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

[0012]

Among the inventions disclosed in the present application, a brief description will be given to the outline of typical ones.
It is as follows.

That is, according to the granulation coating method of the present invention, liquid is supplied to the granular material while supplying the flowing gas through the ventilation part under the condition that the rotating body is rotated in the flow chamber of the body. The gas is sprayed and the compressed gas is jetted from the gas jetting member toward the ventilation part. The compressed air from the gas ejection member is continuously or intermittently ejected. The amount of compressed gas ejected from the gas ejection member may be set to 1/10 or less of the flow rate of the flowing gas.

Further, the fluidized granulation apparatus of the present invention has a body portion having a fluid chamber, a rotating body having a ventilation portion, a fluid gas supply portion for supplying a fluidizing gas into the fluid chamber, and a compressed gas for the aeration portion. And a gas ejection member for ejecting. This rotating body is dish-shaped, mountain-shaped, convex-shaped, or has a disk-shaped surface with a flat surface, and the ventilation part is formed on the rotating body in an annular shape or at a plurality of positions spaced apart from each other in the circumferential direction. The rotating body is formed, or almost the entire rotating body is a ventilation portion. The compressed gas ejection members may be provided at different distances from the center of rotation of the rotating body, and the plurality of gas ejection members may be provided at positions shifted in phase in the circumferential direction.

[0015]

In the above-described granulation coating method of the present invention, the liquid is sprayed on the granular material in a fluidized state by the air flow formed in the fluid chamber, and the granular material is formed. Processing such as granulation or coating is performed. At this time, compressed gas will be jetted from the gas jetting member to the ventilation part, and agglomerates or coating defects or granulation defects will occur without powder particles being clogged in the ventilation part. Without, you can get high quality products. Furthermore, in the granulation coating apparatus of the present invention, an air flow is formed in the flow chamber by the rotation of the rotating body and the flowing gas that passes through the ventilation portion provided in the rotating body, and the flow state is changed by the air flow. The resulting granules are mixed by stirring. Since the compressed gas is jetted from the gas jetting member to the ventilation portion, the powdery particles are prevented from clogging the ventilation portion.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a view showing a fluidized bed granulation coating apparatus according to an embodiment of the present invention. The granulation coating apparatus is installed in a substantially upright state and has a substantially cylindrical shape having a fluid chamber 1 therein. It has a body part 2, and a powdery or granular material as an object to be treated is introduced into the flow chamber 1 from a raw material introduction port 3 provided by opening in the body part 2.

A rotating body 4 is rotatably provided inside the body portion 2 so as to be positioned at the bottom of the flow chamber 1.
An annular gap, that is, a slit 5, is formed between the outer peripheral surface of the and the inner surface of the body portion 2. In order to drive the rotating disc 4, a hollow rotating shaft 6 fixed to the lower surface of the rotating body 4 is rotatably supported by a bearing portion 8 attached to a bottom wall 7 of the body portion 2, The rotation of a variable speed motor 9 is transmitted to the shaft 6 by a belt 10.

A discharge chute 11 having an opening at a position slightly above the rotating body 4 is provided in the body portion 2 in order to discharge the product after the processing such as granulation is completed, and this discharge chute 11 is provided. Is provided with a discharge valve 12 for opening and closing the opening.

As shown in FIGS. 2 and 3, the rotating body 4 has a dish-shaped cross section with its outer peripheral portion inclined upward, and the rotating body 4 has a predetermined shape from the center of rotation. The ventilation part 13 is formed in an annular shape at the position of the radius. In the illustrated case, the ventilation part 13 is formed of a wire mesh that has a predetermined mesh, but the ventilation part 13 may be formed by forming a large number of pores in the rotating body 4.

A cylindrical partition wall 14 is attached to the bottom wall 7 so as to be located inside the ventilation portion 13 in the radial direction, and a cylindrical partition wall 15 is located outside the ventilation portion 13 in the radial direction.
Is attached. Between the partition wall 14 and the partition wall 15,
An annular flowing gas supply part 16 communicating with the ventilation part 13 is formed, and a flowing gas supply part 17 communicating with the slit 5 is formed between the partition wall 15 and the body part 2.

The projections 18 and 19 provided on the upper ends of the respective partition walls 14 and 15 are respectively inserted into the annular grooves formed in the rotating body 4 with a slight clearance, and constitute a labyrinth type seal. is doing. Flowing gas supply unit 17
Inside, a wire net 20 is provided in an annular shape located below the slit 5, and by passing a gas for flow through the wire net 20, the flow is made uniform and rectified, and the powder particles Falling is prevented. Instead of the wire net 20, a porous plate or a woven cloth may be used.

As shown in FIG. 1, an air supply duct 21 is provided adjacent to the body portion 2, and air is supplied to the air supply duct 21 by an air supply fan 22. In the air supply duct 21, a filter 23 for cleaning the air from the air supply fan 22 and a heat exchanger 24 for heating or cooling the gas are provided.

The outlet of the air supply duct 21 is electrically connected to the flowing gas supply portion 17 by the first gas passage 25, and the flowing gas by the second gas passage 27 which is partitioned by the partition wall 26 from the first gas passage 25. It is electrically connected to the supply unit 16. Therefore, the slit 5 and the ventilation part 13
From the above, a flow gas is supplied into the flow chamber 1, and due to the air flow and the rotation of the rotating body 4, the granular material is subjected to the centrifugal tumbling operation and the stirring and mixing action to be in a fluidized state.

In order to adjust the flow rate of the gas flowing through the inlets of the gas passages 25 and 27, as shown in FIG.
As shown in FIG. 3, flow rate adjusting valves 28 and 29 are provided, and the flow rate adjusting valves 28 and 29 are independently controlled to be supplied into the flow chamber 1 through the slit 5 and the ventilation portion 13. It is possible to change the flow pattern due to the air flow. An exhaust duct 30 for discharging the gas in the flow chamber 1 to the outside is provided at the upper end of the body portion 2.

A spray gun 31 is provided in the body portion 2 to spray the coating liquid or the binder liquid on the fluidized granules. Further, the spray gun 31 is sprayed in the fluid chamber 1 so as to face the rotating body 4. A gun 32 is provided, and pumps 33, 34 are provided for the spray guns 31, 32, respectively.
By this, the liquid in the liquid tank 35 is supplied. On the other hand, in the vicinity of the spray gun 31, a nozzle 36 is provided for supplying a powdery or granular material different from the powdery or granular material supplied from the material input port 3 into the flow chamber 1.

As shown in FIG. 2, a jet nozzle 37 for jetting a compressed gas is provided as a compressed gas jet member in the flowing gas supply portion 16 so as to face the ventilation portion 13. In the case shown in the drawing, the radial distances R ₁ and R ₂ from the rotation center O of the rotating body 4 are different from each other, and the two jets are out of phase by 180 ° in the circumferential direction with respect to the center O. A nozzle 37 is provided.

Each of the ejection nozzles 37 may have a structure which ejects compressed gas at a higher speed than the flowing gas with a certain directivity, and the ejection port has a cross-sectional shape of a circle, an ellipse, or a quadrangle. , Any shape such as a polygon can be used. The jet nozzle 37 is provided in the flowing gas supply unit 16 on the upstream side, which is partitioned and formed by the rotating body 4 with respect to the flow chamber 1 on the downstream side of the rotating body 4, that is, in the portion where the powdery or granular material does not exist. Is provided close to the ventilation part 13
It is desirable to set the distance as short as possible.

By blowing the compressed gas from the respective ejection nozzles 37 to the ventilation part 13, the clogging of the ventilation part 13 hardly occurs. The compressed gas may be constantly blown from the jet nozzle 37 to the ventilation part 13 or may be intermittently blown at predetermined intervals.

In the illustrated case, two ejection nozzles 37
Are provided, but the number may be one or two or more. Further, a plurality of ejection ports may be provided in one ejection nozzle 37.

As shown in FIG. 1, a rotary shaft 42 is rotatably supported in the hollow rotary shaft 6 via a bearing 41. The rotary shaft 42 is supported by a motor 44 via a belt 43. It is designed to be driven. This rotating shaft 4
A stirring blade 45 is attached to the tip of 2 so as to be located in the flow chamber 1. By rotating the stirring blade 45 on the upper side of the rotator 4, the granulation and mixing action of the powder and granules is promoted. However, the stirring blade 4 described above
5 may not be used.

As shown by the chain double-dashed line in FIG. 2, the stirring blade 45 has a boss portion 46 fixed to the tip of the rotary shaft 42 and three stirring blades 47 radially extending from the boss portion 46. is doing. By forming an air supply passage in the center of the rotating shaft 42 of the stirring blade 45 and blowing the purge gas from the lower surface of the boss portion 46 through the air supply passage, the rotating shaft 4
It is possible to prevent powder particles from being caught between the rotating body 4 and the rotating body 4.

A bag filter 51 and a jet nozzle 52 for jet cleaning, which continuously removes dust and the like adhering to the bag filter 51 by a high pressure gas pulse, are arranged above the body portion 2. Body part 2
An openable lid 53 is provided on the upper wall of the.

Next, the procedure of the granulation coating process by the granulation coating apparatus shown in FIGS. 1 to 3 will be described.

The powdery or granular material is supplied from the material inlet 3 in a predetermined amount. The powdery material is stirred and mixed in a fluidized state by repeating the rising by the flow gas supplied from the ventilation part 13 and the slit 5 and the falling by its own weight.
Further, by rotating the rotating body 4 by the motor 9, the powder and granules are also stirred and mixed for centrifugal rotation.
This stirring and mixing is promoted by rotating the stirring blade 45 in the same direction or in the opposite direction as the rotating body 4 by the motor 44.

The binder liquid or the coating liquid is sprayed from one or both of the spray guns 31 and 32 toward the powder and granules thus mixed and stirred. If necessary, the granular material is also supplied from the nozzle 36 into the fluidized bed. Depending on the progress of granulation coating, the supply ratio of the flowing gas from the slit 5 and the ventilation part 13 is
It can be changed by adjusting the openings of the flow rate adjusting valves 28 and 29.

Further, the compressed gas is ejected toward the ventilation part 13 from the ejection nozzle 37 as the compressed gas ejection member. As a result, even if the powder and granules in the fluidized and agitated state enter the ventilation part 13, they are blown into the flow chamber 1 by the compressed gas from the injection nozzle 37, and the ventilation part 13 is clogged with the powder and granules. Is prevented.

The gas supplied or jetted into the flow chamber 1 from the ventilation part 13 or the like is discharged to the outside from the exhaust duct 30.

Experiments were carried out under the following conditions using the granulation coating apparatus shown in FIGS. That is, the distance between each tip of the two injection nozzles 37 and the ventilation part 13 is set to 18 mm, 20 kg of lactose powder is charged as the raw material for the granular material, and the temperature is 70 ° C. while rotating the rotating body 4 at the rotation speed of 125 RPM. Flowing air of 6m ³ / min at a flow chamber 1
Hydroxypropylcellulose HLC-L (Nippon Soda Co., Ltd.) was supplied into the tube to rotatively flow the raw material, and the pressure of the compressed air from the injection nozzle 37 was set to 5 kg / cm ² and ejected at a rate of 300 liters / minute. Company made) 5% aqueous solution 10Kg
Was sprayed and granulated for 1 hour and 20 minutes.

This granulation operation was carried out continuously for 4 batches under the same conditions, but no clogging occurred in the ventilation part 13, and good granules were obtained in all batches.

On the other hand, when the granulation was carried out under the same conditions as those except that the compressed air was not jetted from the jet nozzle 37, the fluidized state became a little bad at the end of one batch, and after the end, The inspection revealed that the ventilation part 13 was clogged.

FIGS. 4 (A) and 4 (B) are views showing a rotating body according to another embodiment of the present invention. In the above embodiment, the rotating body 4 was formed with the ventilation portion 13 in an annular shape. A plurality of ventilation parts 13 are formed in the circumferential direction on the rotating body 4 shown in FIG. 4 (A). Further, in the rotating body 4 shown in FIG. 1B, the ventilation portion 13 is formed on almost the entire surface of the rotating body 4, and the ventilation portion 13 is provided with a large number of pores in the rotation body 4. It is formed by.

As described above, whether the ventilation part 13 is formed by using the wire mesh, the ventilation part is formed by providing pores in the rotating body 4, and in which part the ventilation part 13 is formed, etc. It is possible to make various changes depending on the type of powder or granular material to be charged and the flow pattern formed in the flow chamber 1.

5 (A) to 5 (C) are views showing a rotating body of still another embodiment of the present invention. The rotating body 4 shown in FIGS. 1 to 3 has a dish-shaped cross section. On the other hand, as shown in FIG. 5 (A), a disc whose entire surface is flat may be used as the rotating body, and as shown in FIG. 5 (B), the rotating body 4 having a chevron cross section is used. Alternatively, as shown in FIG. 5C, the rotating body 4 having a convex cross section may be used.

In the case shown in FIGS. 4 and 5, the stirring blade 45 shown in FIGS. 1 to 3 is not provided, and
As shown in FIG. 5, partition walls 14 and 15 are provided below the rotating body 4.
Is not provided. Therefore, in this case, the flowing gas is supplied to the ventilation part 13 and the slit 5 from the flowing gas supply part 16 formed by the rotating body 4 on the lower surface side thereof.

If the injection nozzle 37 is provided so as to face the ventilation portion 13, it can have various postures depending on the form of the rotating body 4. That is, as shown in FIG. 5 (B), it may be installed at an angle, or as shown in FIG. 5 (C), it may be installed horizontally.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the embodiments and various modifications can be made without departing from the scope of the invention. Needless to say.

For example, the width of the slit 5 may be variable. Further, as shown in Japanese Examined Patent Publication No. 6-8735, a crusher having a crushing blade may be provided in the body portion 2 so as to protrude above the rotating body 4.
Furthermore, the present invention can be applied not only to spherical particles, but also to coating of columnar pellets and crystalline powders, etc., from soft and light products to hard and heavy products, which can be economically and efficiently granulated, and liquid It is also possible to only mix the powder and granules without spraying.

[0049]

The effects obtained by the typical ones of the inventions disclosed in the present application will be briefly described as follows.
It is as follows.

(1) Since compressed gas is jetted from the gas jetting member to the ventilation part, it is possible to prevent the ventilation part from being clogged with the powdery particles when processing the powdery particles in the flow chamber. it can.

(2) Since clogging is prevented, uneven flow of the flowing gas supplied to the flow chamber through the ventilation part and reduction of the wind speed or air volume are prevented, and a desired fluidized bed is formed in the flow chamber. It is formed.

(3). Since the desired fluidized bed is formed,
A decrease in product quality and yield is prevented, and a high quality product can be obtained with a high yield.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a fluidized bed granulation coating apparatus which is an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a main part of FIG.

FIG. 3 is a perspective view showing a rotating body shown in FIGS. 1 and 2.

4 (A) and 4 (B) are plan views showing another form of the ventilation part provided in the rotating body.

5A to 5C are cross-sectional views showing other forms of the rotating body.

[Explanation of symbols]

1 Flow chamber 2 torso 3 Raw material inlet 4 rotating body 5 slits 6 rotation axes 7 bottom wall 8 bearing 9 motors 10 belts 11 discharge chute 12 discharge valve 13 Ventilation section 14,15 partitions 16, 17 Flowing gas supply unit 18,19 Protrusion 20 wire mesh 21 Air supply duct 22 Air supply fan 23 Filter 24 heat exchanger 25 First gas passage 26 partitions 27 Second gas passage 28, 29 Flow control valve 30 exhaust duct 31,32 spray gun 33,34 pumps 35 tanks 36 nozzles 37 injection nozzle (gas injection member)

(72) Inventor Ozeki Fura 1200-1 Matsukura-cho, Kawashima-cho, Hashima-gun, Gifu Prefecture (72) Inventor Hideo Murakami 892 Hozumi-cho, Hozumi-cho, Motosu-gun, Gifu (72) Inventor Kazuhiko Tamura Hashima-gun River, Gifu Shimamachi Takehaya 2 (56) Reference JP-A-5-49902 (JP, A) Actual development Sho 60-176240 (JP, U) Japanese Patent Sho 61-8735 (JP, B1) (58) Fields investigated (Int .Cl. ⁷ , DB name) B01J 2/16 B01J 8/38

Claims (7)

(57) [Claims] 1. A rotating body provided at a bottom portion of the fluid chamber in a body portion having a fluid chamber to which the powder and granules are supplied is rotated, and a ventilation portion provided in the rotor is provided. While supplying the flowing gas from the flowing gas supply unit to the flow chamber, the liquid is sprayed on the granular material, and further compressed gas from the gas ejection member provided in the flowing gas supply unit toward the ventilation unit. A granulation coating method characterized by spraying and granulating or coating a powder or granular material. 2. The granulation coating method according to claim 1, wherein the compressed gas is continuously or intermittently jetted from the gas jetting member. 3. The amount of compressed gas jetted from the gas jetting member is set to 1 of the flow rate of the flowing gas from the flowing gas supply section.
It is 1/0 or less, The claim 1 or 2 characterized by the above-mentioned.
The described granulation coating method. 4. A body part having a flow chamber to which powder and granules are supplied, a rotor having a ventilation part rotatably provided at the bottom of the flow chamber, and a flow part into the flow chamber via the ventilation part. A fluidized granulation coating apparatus comprising: a fluidized gas supply unit that supplies a working gas; and a gas jetting member that jets a compressed gas to the ventilation unit is provided in the fluidized gas supply unit. 5. The fluidized granulation coating apparatus according to claim 4, wherein the rotating body has a dish shape, a mountain shape, a convex shape, or a disk shape with a flat surface. 6. The ventilation part is formed in an annular shape on the rotating body, or is formed at a plurality of positions spaced apart from each other in the circumferential direction, or substantially the entire rotating body is used as the ventilation part. The fluidized granulation coating apparatus according to claim 4 or 5, wherein 7. The plurality of gas ejection members are provided at positions different in distance from the center of rotation of the rotating body and at mutually shifted phases in the circumferential direction. The fluidized granulation coating apparatus according to 4, 5, or 6.