JP2001334140A - Centrifugal tumbling granulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the dew condensation in a centrifugal tumbling chamber of a centrifugal tumbling granulator. SOLUTION: A stationary wall 7 of the centrifugal tumbling granulator 1 is enclosed by an external wall 32. A thermally insulating space 33 is formed between the stationary wall 7 and the external wall 32. An air exit 35 is formed at the external wall 32 and is connected to a vacuum pump 36. The air in the thermally insulating space 33 is sucked by a vacuum pump 36 and a vacuum state below 13.3 Pa is attained. The conduction of heat is shut off by the thermally insulating space 33 in which the vacuum state is attained, by which the conduction of the heat of the outdoor air to the stationary wall 7 is averted. Then, the stationary wall 7 is cooled by the outdoor air and the occurrence of dew condensation at its inside surface may be prevented and the adhesion of the powder and granular materials to the inside surface of the stationary wall 7 may be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a granulation technology for a granular material, and more particularly to a technology effective for granulating spherical particles such as pharmaceuticals and foodstuffs using a centrifugal rolling granulator. is there.

[0002]

2. Description of the Related Art Conventionally, a rolling granulation method in which a powder is tumbled and granulated to obtain a spherical or nearly spherical granule has been known. As a rolling granulation apparatus for performing the rolling granulation method, for example, a rotating plate is disposed at the bottom of a cylindrical container as disclosed in JP-B-46-10878 and JP-B-46-22544. 2. Description of the Related Art A centrifugal tumbling granulating apparatus in which a granule is provided and tumbled thereon is known. In this centrifugal tumbling granulator, spherical granulation is performed by applying centrifugal force to the particles by the rotation of a rotating dish, so that it is possible to obtain small granules having a narrow particle size distribution, and in general, pharmaceuticals, foods, etc. Used in the field.

[0003]

However, in such a centrifugal tumbling granulator, since the cylindrical container is usually formed of a non-insulating material such as a stainless steel plate,
The centrifugal rolling chamber formed above the rotating plate is directly cooled by the outside air. On the other hand, in order to carry out granulation, coating, etc., an aqueous liquid is sprayed on the object to be treated in the container. For this reason, the inside of the container becomes a humid atmosphere, and the inner surface of the centrifugal rolling chamber is formed. Some parts have a temperature below the dew point. Then, moisture in the centrifugal rolling chamber is condensed on this portion.

[0004] When condensation forms in this way, the droplets and powder of the binder adhere to and dissolve in the moisture, function as an adhesive, and the powder and granules adhere. Then, the granular material becomes a nucleus, and further the granular material adheres, and expands over the entire inner surface of the fixed wall. For this reason, there has been a problem that not only is time required for cleaning the apparatus, but also the product yield and the operation efficiency of the apparatus are adversely affected.

On the other hand, in the centrifugal tumbling granulator, if the granular material easily slips on the surface of the rotating dish, the tumbling motion is hindered, and the centrifugal tumbling granulation or powder coating can be surely performed on the granular material. No, the rotation speed of the rotating plate cannot be increased, and there is still a problem in production efficiency. In addition, tight granulation, small-volume processing, and the like cannot be performed, and improvement in production capacity has been desired.

Furthermore, when air is blown from above in the vertical direction on the rotating plate, the air is blown straight through the rotating plate because the air is linear, and the circulation time there tends to be short. For this reason, there was a problem that the rolling of the granular material could not be sufficiently promoted and the processing efficiency was not good. Further, since the contact time between the airflow and the granular material tends to be short, there is a problem that the residence time of the airflow in the granular material layer is short, and the drying efficiency is difficult to increase.

An object of the present invention is to prevent dew condensation in a centrifugal rolling chamber in a centrifugal rolling granulator having an air supply means above a rotating plate. Another object of the present invention is to prevent the granular material from slipping on a rotating dish and to reliably perform the centrifugal rolling granulation of the granular material. Further, another object of the present invention is to prolong the contact time between the airflow and the granular material and improve the drying efficiency.

[0008]

According to the present invention, there is provided a centrifugal rolling granulator according to the present invention, wherein at least a fixed wall having a circular horizontal cross-section of a powder contacting portion with a granular material, and a predetermined space inside the fixed wall are provided. A rotating plate that is provided with a gap therebetween and that is rotated in the horizontal direction by rotation driving means, and is disposed above the rotating plate and close to the rotating plate, and supplies gas to the upper surface side of the rotating plate A centrifugal rolling granulator having an air supply means, wherein the fixed wall has a dew condensation preventing means for preventing dew condensation occurring on an inner surface of the fixed wall.

According to the present invention, firstly, dry air can be supplied from above the rotary dish via the air supply means, and the granulated material can be dried in the same apparatus by the dry air. . Therefore, there is no need to transfer the granulated material to another device to perform a drying process, and it is possible to improve productivity.

Secondly, the dew condensation preventing means can prevent dew formation on the inner surface of the fixed wall, suppress powder particles from adhering to the inner surface of the fixed wall, ease the washing operation, and reduce the product collection. The efficiency and operation efficiency of the apparatus are improved, and the production efficiency and the like can be improved.

In this case, as the dew condensation preventing means, an outer wall surrounding the fixed wall and a heat insulating space formed between the fixed wall and the outer wall may be provided. Thereby, the conduction of heat is cut off in the heat insulating space, and the fixed wall is not affected by the temperature of the outside air. Therefore, it is possible to prevent the fixed wall from being cooled by the outside air and causing dew condensation on its inner surface. Further, the dew condensation preventing means may further include a pump device for sucking air in the heat insulating space, as a means for forming the heat insulating space. In addition, the heat-insulating space may be filled with a gas having a pressure lower than the atmospheric pressure. At this time, the pressure of the gas in the heat-insulating space is preferably 1.33 Pa or less. Thus, the outer periphery of the fixed wall can be surrounded by the heat insulating space in a vacuum state, the effect of blocking heat conduction can be further enhanced, and the effect of preventing dew condensation can be further improved.

On the other hand, another centrifugal rolling granulator of the present invention comprises:
A fixed wall having a circular cross section of at least a powder contacting portion with the granular material, a rotating plate provided at a predetermined interval inside the fixed wall, and rotated in a horizontal direction by a rotation driving unit; A centrifugal tumbling granulator comprising: a gas supply means disposed above the rotating dish and in close proximity to the rotating dish, for supplying gas to an upper surface of the rotating dish. It is characterized in that the surface of the powder contacting part of the rotating dish is formed smooth, whereby spherical granulation by the rotating dish can be effectively performed.

[0013] Further, a slip prevention means for preventing slipping of the granular material in the powder contact portion may be provided in the powder contact portion of the rotary dish, whereby the powder particle slips on the rotary dish. Is prevented, the centrifugal grip is strengthened, and the rolling of the granular material is activated. Therefore, it is possible to reliably perform the centrifugal rolling granulation of the granular material, and it is possible to achieve high-speed rotation of the rotating plate, tight granulation, improvement of small-volume processing capability, and the like.

The rotating plate on which the slip prevention means of the present invention is to be provided may be a flat plate, or may have an inclined surface as shown in FIG.

In this case, as the slip prevention means,
Radial grooves may be formed in the powder contact portion of the rotating dish,
Further, in the groove, a side wall on the rotation direction front side of the rotating plate may be formed to be a gentler slope than a side wall on the rotation direction rear side.

Further, another centrifugal rolling granulator according to the present invention is characterized in that at least a fixed wall having a circular horizontal cross section of a portion in contact with the granular material is provided with a gap at a predetermined interval inside the fixed wall. A rotating plate that is rotated in a horizontal direction by a rotation driving unit, and an air supply that is disposed above the rotating plate and close to the rotating plate and supplies gas to an upper surface side of the rotating plate. And a swirling airflow generating means for supplying swirling air onto the rotating plate in the air supply means.

[0017] In this way, a swirling motion can be imparted to the granular material on the rotating plate, and the granular material is wound up in a spiral rotation like a rope. Therefore, the rolling of the granular material can be promoted, and the processing efficiency can be improved. In addition, it is possible to prevent the air current from blowing through linearly, to lengthen the contact time between the air flow and the granular material, to increase the residence time of the air flow in the granular material layer, and to increase the drying efficiency. It is also possible.

Further, a wind guide plate may be provided in the air supply means as the swirling air flow generation means.

In addition, the centrifugal rolling granulator of the present invention has a fixed wall having at least a circular horizontal cross section of a powder contacting portion with a granular material, and a gap at a predetermined interval inside the fixed wall. A rotating plate that is rotated in a horizontal direction by a rotating drive unit, and an air supply unit that is disposed above the rotating plate and close to the rotating plate and supplies gas to an upper surface side of the rotating plate. A centrifugal rolling granulator comprising: wherein the air supply means is disposed in a state of being inclined from above the rotating dish toward a rotation direction of the rotating dish, and the air supply means is provided on the rotating dish. It is characterized in that a swirling airflow is formed by supplying gas along the rotation direction.

Thus, as described above, the rolling of the granular material is promoted by the swirling airflow, and the contact time between the airflow and the granular material can be extended.

[0021]

(Embodiment 1) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing a configuration of a centrifugal rolling granulation coating apparatus according to Embodiment 1 of the present invention.

As shown in FIG. 1, a centrifugal rolling granulation coating apparatus (hereinafter, referred to as a CF apparatus) 1 according to the present embodiment performs centrifugal rolling of a granular material 2 to perform granulation or coating. It is a device for forming layers. In the CF device 1, a binder liquid or powder is added to the granular material 2 at a predetermined speed, and a granulating process such as a spherical granule is performed with the granular material as a core or by combining the powders. In the CF device 1, a coating layer can be formed on the granules and the like by adding the powder and the binder liquid while the centrifugally rolling the spherical granules and the like.

The CF device 1 has a centrifugal rolling part 3 located at the upper part of the apparatus and a rotary driving part 4 located at the lower part thereof.
It is composed of The centrifugal rolling section 3 is formed with a centrifugal rolling chamber 6 for centrifugally rolling the charged granular material 2 to perform a granulation coating process. The centrifugal rolling chamber 6 includes a cylindrical fixed wall 7 that forms a housing of the CF device 1,
And a rotating plate 5 which is a substantial bottom of the centrifugal rolling chamber 6. In addition, the upper part of the centrifugal rolling chamber 6 may be in an open state, but it is also possible to keep a part other than the part which needs to communicate with the outside in a closed state.

The fixed wall 7 has a circular cross section of the powder contacting portion 7 a with the granular material 2, and a gap 12 at a predetermined interval is formed between the rotating plate 5 and the inner wall of the fixed wall 7. ing. Here, the reason why the horizontal cross section of the powder contacting portion 7a is circular is to smoothen the motion of the centrifugally rolling powder and granular material and to avoid dead space. Therefore, here, the fixed wall 7 is the centrifugal rolling part 3.
Has a similar circular horizontal cross-section over the entire height, but the cross-sectional shape of the portion other than the powder contact portion 7a is not limited to a circle. That is, the fixed wall 7 may be not only conical or spherical but also square, and the whole shape is not limited to the cylindrical shape as long as a part thereof constitutes the dusting portion 7a having a circular cross section. .

The material of the fixed wall 7 is not particularly limited, but various materials such as stainless steel, iron, light alloy, and reinforced plastic can be used. In addition, the powder contact part 7
A part or all of a may be lined with a non-adhesive resin such as a fluororesin or polyether. Furthermore, a lining of a non-adhesive resin may be applied to the central portion 5a and the inclined portion 5b of the rotating plate 5 to be described later. Can be prevented.

On the other hand, as described above, in the case where the centrifugal rolling chamber 6 is separated from the outside air only by the metal fixed wall 7,
The fixed wall is cooled directly by the outside air. For this reason, a portion having a temperature below the dew point locally occurs on the inner surface of the fixed wall 7, and moisture in the centrifugal rolling chamber 6 is condensed in such a portion. For example, when the inside of the centrifugal rolling chamber 6 has an atmosphere of a temperature of 70 ° C. and a humidity of 60%, when the temperature drops to 58 ° C., the humidity becomes 100%. Therefore, the part cooled to 58 ° C. or lower by the outside air becomes a dew point zone, where dew condensation occurs.

When dew condensation occurs, the droplets and powder of the binder adhere to and dissolve in the water, function as an adhesive, and the powder and granules adhere. Then, the granular material becomes a nucleus, and further the granular material adheres, and expands over the entire inner surface of the fixed wall. For this reason, not only is time required for cleaning the apparatus, but also the product yield and the operation efficiency of the apparatus are affected, and improvements have been desired.

Therefore, in the apparatus of this embodiment, FIG.
As shown in FIG. 2, the centrifugal rolling chamber 6 has a double wall structure, and a vacuum heat insulating chamber 33 is formed outside the fixed wall 7 so that the fixed wall 7 is not affected by the outside air temperature. . That is,
The fixed wall 7 is provided with a heat insulating chamber 33 as dew condensation preventing means, so that the inner surface temperature of the fixed wall 7 does not drop below the dew point.

In the CF device, first, an outer wall 32 is provided so as to surround the entire fixed wall 7. Further, between the fixed wall 7 and the outer wall 32, an air-tightly formed heat-insulating chamber (heat-insulating space) 33 is formed. A stainless spacer 34 having a diameter of about 1 mm to 2 mm is provided between the fixed wall 7 and the outer wall 32 so as to abut on both walls.

The outer wall 32 is further provided with an exhaust port 35 for discharging air from the heat insulating chamber 33. The exhaust port 35 is connected to a vacuum pump (pump device) 36 provided outside the device. Then, by operating the vacuum pump 36 to suck the air in the heat insulating chamber 33,
The inside of the heat insulating chamber 33 is filled with a gas having a pressure lower than the atmospheric pressure. That is, the inside of the heat insulation chamber 33 is in a vacuum state. At this time, the space in the heat insulating chamber 33 is also secured by the spacer 34 disposed between the fixed wall 7 and the outer wall 32.

The inside of the heat insulation chamber 33 is in a medium vacuum state (10
² Pa to 10 ^-1 Pa) or high vacuum (10 ^-1 Pa
-10 ^-5 Pa). However, in the present embodiment, considering the rigidity of the device and the heat insulating effect, the cost effectiveness is not considered.
3.3 Pa (0.1 Torr) or less, preferably 13.3 to
The pressure is set to 1.33 Pa (0.1 to 0.01 Torr).

As described above, when the heat insulation chamber 33 is in a vacuum state, the conduction of heat inside and outside the device is interrupted. That is,
Even if there is a temperature difference between the inside of the centrifugal rolling chamber 6 and the outside of the device,
The fixed wall 7 is not directly cooled by the outside air temperature. For this reason, even if the inside of the centrifugal rolling chamber 6 becomes hot and humid, the fixed wall 7 is not cooled by the outside air and dew condensation does not occur on the inner surface thereof. Therefore, the granular material does not adhere to the inner surface of the fixed wall 7, the washing operation is eased, and the production efficiency and the like can be improved.

An air supply device (air supply means) 21 is provided above the center of the rotating plate 5 in the centrifugal rolling chamber 6. FIG.
Is an explanatory view showing an arrangement state of the air supply device 21, and shows a state in which the ceiling portion of the centrifugal rolling chamber 6 is omitted and the air supply device 21 is viewed from above. The air supply device 21 includes a straight pipe portion 25 formed in a straight cylindrical shape, and an umbrella-shaped air supply port 23 provided below the straight pipe portion 25. The straight pipe section 25 and the air supply port 23 communicate with each other inside,
The straight pipe section 25 is connected to a blower (not shown) such as a blower provided outside the CF device 1.

The air supply device 21 is mounted so as to be vertically movable in the centrifugal rolling chamber 6 by driving means (not shown). Then, it can move between an upper position H indicated by a dashed line and a lower position L indicated by a solid line in FIG. However, it is needless to say that the air supply device 21 may have a fixed structure.

At the lower end of the straight pipe section 25, a conical air supply port 23 whose lower side is enlarged in diameter is attached. When the air supply device 21 is lowered to the lower position L, the air supply port 23 is configured to cover the rotating plate 5 in an umbrella shape at its lower end. Then, from the opening 23a of the air supply port 23,
The drying air 22 can be supplied widely to the upper surface of the rotating plate 5. And the lower peripheral edge 23 of the air supply port 23
Dry air 22 is blown out from the gap between b and the rotating plate 5. As a result, the granulated material flows in the centrifugal rolling chamber 6, and its drying is promoted. That is, the CF
In the apparatus 1, it is possible to dry the granulated matter generated by the drying air 22, and it is possible to perform from the granulation processing to the drying processing in a single apparatus.

A supply pipe 9 for supplying the granular material 2 to the rotating plate 5 is provided from above the centrifugal rolling chamber 6 with its inlet 9 a facing the rotating plate 5. Further, a spray nozzle 15 for spraying the binder liquid or the powder stored in a tank (not shown) onto the granular material 2 is also provided. In this case, a nozzle having a two-fluid or three-fluid structure can be used as the spray nozzle 15. The position of the spray nozzle 15 may be above the granular material layer as shown in the drawing, or may be installed so as to spray into the granular material layer from the side. It is only necessary that the purpose of supplying the spray liquid to the granular material be achieved.

The rotating plate 5 is formed of a central portion 5a on a plane located on the center side, and an inclined portion 5b which is inclined linearly downward toward the center outside the central portion 5a. In the CF device 1, the vertical cross section of the rotating plate 5 is
The horizontal dimension (P) of the inclined portion 5b is P ≧ 0.25D (preferably 0.4D ≧) with respect to the diameter (D) of the rotating plate 5.
(P ≧ 0.25D). Also, the height (H) of the inclined portion 5b from the central portion 5a.
Is in the range of 0.1D ≦ H ≦ 0.33D (preferably 0.1D ≦ H ≦ 0.25D) with respect to the diameter (D). Thus, in the CF device 1, the centrifugal force of the rotating plate 5 is sufficiently and effectively used, and the granular material 2 is effectively centrifugally rolled on the inclined portion 5b.

A conical raised portion 8 is formed at the center of the central portion 5a of the rotating plate 5, whereby the rotating plate 5 is prevented from being distorted and has sufficient strength. Further, the raised portions 8 positively move the granular material 2 near the center of the rotating plate 5 to the inclined portion 5b where the centrifugal operation is performed.

The portion of the inner wall of the fixed wall 7 with which the granular material 2 contacts during centrifugal rolling, that is, the powder contacting portion 7a,
The rotating plate 5 is formed substantially perpendicular to the central portion 5a. As a result, the granular material 2 that centrifugally rolls on the rotating plate 5 is pushed upward along the powder contact portion 7a without receiving extra resistance.

An air supply for taking slit air 10 flowing through a gap 12 between the rotating plate 5 and the fixed wall 7 into a fluid chamber 11 formed below the rotating plate 5 is provided below the fixed wall 7. Port 7b is open. The air taken in from here becomes slit air 10 passing through the annular gap 12 from the fluid chamber 11 and is introduced into the centrifugal rolling chamber 6. In this case, the gap 12 is formed in such a width that the granular material 2 in the centrifugal rolling chamber 6 does not drop from the slit air 10 when the slit air 10 is fed from below. Therefore, gap 1
2 through the slit air 10 so that the gap 1
2 is prevented from dropping from the centrifugal rolling chamber 6, the powder 2 is placed on the rotating plate 5.
Will be supported by all.

On the other hand, a motor (rotation driving means) 13 for rotating the rotation plate 5 is provided on the rotation
It is housed and provided inside. The shaft 13a of the motor 13 is fixed to a rotation center axis of the rotating plate 5, whereby the rotating plate 5 is rotated in the horizontal direction.

Next, the operation of the present embodiment will be described. In the CF device 1, the air supply device 21 is raised to the upper position H, and the granulation process is performed. After the granulation process, the air supply device 21 is lowered to the lower position L, and subsequently, the drying process is performed. During the processing, the pressure in the heat insulation chamber 33 is 13.3P.
a, heat conduction with the outside air is shut off so that dew condensation does not occur on the inner surface of the fixed wall 7.

Therefore, first, in the granulation step, the air supply is stopped while the air supply device 21 is arranged at the upper position H,
A predetermined amount of the granular material 2 which is a raw material to be processed is charged from a charging port 9 a of a supply pipe 9 onto a rotating plate 5 in a centrifugal rolling chamber 6. At this time, the powder used as the raw material may be a powder or a core. In addition, depending on the granulation conditions,
With the air supply device 21 disposed at the lower position L, the air supply device 2
Granulation or coating may be performed while air is supplied from the beginning.

The rotating plate 5 is rotated by the motor 13 while the slit air 10 flows through the gap 12, and the powder 2 is centrifugally rolled on the rotating plate 5. In this case, the rotation speed of the rotating plate 5 is arbitrary, but is usually 30 to
300 RPM.

Further, in order to adhere the powders to each other or to the core particles, a solution in which a solvent or a binder solution is dissolved, a dispersion such as an emulsion or a suspension, or a melt in some cases, is sprayed from the spray nozzle 15. It is sprayed into the centrifugal rolling chamber 6. This solvent or solution may be used alone depending on the physical properties of the granular material or the desired granulated material, or may be changed from one to the other according to the progress of granulation. When a solution is used, a substance having the same component as that of the granular material is usually used as a solute, but another substance may be used. Further, a powder may be supplied during the granulation step as needed.

Thus, the granular material 2 is centrifugally rolled on the rotating plate 5 in the centrifugal rolling chamber 6, and the binder liquid and the powder are supplied to the granular material 2 in that state. Therefore, the granular material 2 is centrifugally rolled and spherically granulated.

Following the above-mentioned spherical granulation, or
Spherical particles produced separately can be charged into the apparatus of the present invention, and a drug or an eluting control layer can be coated thereon.
Further, not only spherical particles but also irregular particles or powders can be coated with a drug or an elution control layer.

When the granulated particles reach the desired particle size, the supply of the solvent or the solution is stopped, and the granulation process is completed. At this time, since the apparatus 1 employs the same granulation process as a conventional single-function CF apparatus, it is possible to granulate spherical particles having a small particle diameter and a narrow particle size distribution. However, it goes without saying that large spherical particles can also be produced. Also,
Depending on the operating conditions, not only spherical particles but also irregularly shaped particles, oblong or aggregated particles having a certain pseudo-spherical morphology, such as elliptical spheres and go-stones, which are not true spheres, can be produced.

After the completion of the granulating step, the granulated material is dried. In a conventional CF device, since the drying ability of the device is poor, the drying process is performed by transferring the granulated material to another device. On the other hand, in the CF device 1, it is possible to granulate granules having the same sphericity and particle size as the conventional device, but also to perform the drying process in the same device.

That is, after the end of the granulation process, air supply from the air supply device 21 which has been previously raised to the upper position H is started, and is gradually moved to the lower position L. And
Dry air 2 is supplied from the air supply device 21 into the granulated material layer on the rotating plate 5.
2 is introduced into a fluidized state. As a result, the granulated material is quickly dried by the drying air 22, and a desired spherical particle product is efficiently produced. At this time, it is possible to increase the amount of slit air 10 by widening the gap 12 to further improve the drying ability.

In the drying step, the rotating plate 5 may be in a rotating state or a stopped state. The height of the lower position L of the air supply device 21 is not particularly limited, but at least a part of the air supply device 21 is made to enter the accumulation layer of the granulated material, and the granulated material is It is preferable to perform a vertical movement in a flow or a state close to the flow. That is, in the CF device 1 as well, the air supply port 2
It is desirable to arrange the air supply device 21 at a position where the peripheral edge of the third opening 23a is buried in the particle layer to improve the drying efficiency.

As described above, in the CF device 1 according to the present invention,
Just like conventional single-function CF devices, heavy spherical particles with a small particle size and a narrow particle size distribution can be granulated, and they can be dried in the same device. It is possible. Therefore, it is possible to manufacture a product having the physical properties of a single-function CF device with the productivity equivalent to that of a multi-function powder processing device, and efficiently manufacture a product that meets market needs. It becomes possible.

In the apparatus, “granulation → drying”,
"Coating → drying", "coating + drying (drying while coating)", "granulation → coating →
Various processing patterns such as “drying” and “granulation → coating + drying” are possible. In the above-described embodiment, for the “granulation → dry” processing, the air supply device 21 is disposed at the upper position H to perform the granulation processing, and then the drying processing is performed at the lower position L. In this case, both the granulation process and the drying process are performed with the air supply device 21 disposed at the lower position L, and all the processes are performed at the lower position L.
Can also be implemented.

As described above, the apparatus can also perform a coating process. In the process of “coating → drying” in the above processing pattern, the granulated particles or separately charged particles are supplied to the air supply device 21. May be disposed at an upper position H to perform a coating process, and then a drying process may be performed at a lower position L. Further, the air supply device 21 can be arranged at the lower position L from the beginning, and the coating process and the drying process can be performed continuously (“coating → drying”) or simultaneously (“coating + drying”). .

Further, a series of processes of “granulation → coating → drying” can be executed by the apparatus.
At this time, at least in the drying step, the air supply device 21 is disposed at the lower position L to perform the process, but in the granulation process or the coating process, the air supply device 21 may be disposed at any of the upper and lower positions. good. That is, it is also possible to perform processing at the lower position L from granulation to drying, or to perform only granulation processing at the upper position H.

In addition, when performing the process of “granulation → coating + drying”, at least in the process of drying while coating, the air supply device 21 is disposed at the lower position L and the process is performed. In the particle processing, the air supply device 21 may be disposed at any position above or below.

Note that, as in the apparatus shown in FIGS.
The dry air 22 may be supplied from above the peripheral portion of the dry air.

In the apparatus shown in FIG. 4, the straight pipe section 25 of the air supply device 21 disposed at the center of the centrifugal rolling chamber 6 branches off above the rotating plate 5, and the branch pipe 28 of the rotating plate 5 It has a form that extends upward to the periphery and is open. In this case, the branch pipe 28
Although two are shown in FIG. 4, the number thereof can be appropriately increased or decreased, for example, by providing four equally.

In the apparatus shown in FIG. 5, a plurality of straight pipe portions 25 of the air supply device 21 are arranged around the centrifugal rolling chamber 6. In FIG. 5, four straight pipes 25 are equally provided as shown in FIG. 5B, and the dry air 22 is supplied to the periphery of the rotating plate 5 from the lower end opening. You. Also in this case, the number of straight pipe portions 25 can be appropriately increased or decreased, for example, two or six.

(Second Embodiment) Next, a second embodiment in which a rotating plate 5 is provided with slip prevention means will be described. FIG. 6 is an explanatory view showing the configuration of the rotating plate according to the second embodiment of the present invention when viewed from above, FIG. 7 is a perspective view thereof, and FIGS. 8 and 9 are explanatory views showing the configuration of a slip prevention groove. . The configuration other than the rotating plate 5 is the same as that of the CF device in FIG.

In the apparatus shown in FIG. 1, the surface of the rotating plate 5 is formed to be smooth, that is, to have a small surface roughness in order to effectively perform spherical granulation. However, as described above, if the entire surface of the rotating plate 5 is smooth, the granular material easily slips on its surface, which hinders the rolling motion.

Therefore, in the apparatus of the second embodiment, FIG.
As shown in FIG. 7, a slip prevention groove (slip prevention means) 37 is provided on the rotating plate 5 to enhance the grip force. That is, in this device, the slip prevention groove 37 is formed in a spiral shape on the entire surface of the powder contacting portion of the rotating plate 5, and the powder and granules are drawn into the groove to promote the rolling operation. The anti-slip groove 37 is formed on the surface of the rotating plate 5 which is smooth and has a thickness of 0.1 mm.
It is formed as a groove of about 5 to 2 mm. The slip prevention groove 37 has a groove cross-sectional shape set in accordance with the rotation direction of the rotating plate 5, and the side wall 37a on the front side in the rotation direction is formed on a gentle slope, and the side wall 37b on the rear side is formed on a steep slope. That is, in the case of rotating leftward in FIG. 6, FIGS.
As shown in FIG.
(B) and 9 (b) are formed.

As described above, the slip prevention groove 37 is formed in the rotating plate 5.
Is provided, the granules on the rotating plate 5 are subjected to spherical granulation on a smooth surface portion, and the rolling is promoted by the slip preventing grooves 37. That is, the slip of the granular material is prevented, the centrifugal grip is strengthened, and the rolling of the granular material is activated. Therefore, it becomes possible to perform the centrifugal rolling granulation or the powder coating of the powdery granules without fail, and it is possible to achieve a high-speed rotation of the rotating plate, a tight granulation, an improvement in small-volume processing capability, and the like.

On the other hand, in the second embodiment, the groove is formed as the slip prevention means. However, the groove may be formed as a ridge-shaped protrusion. Further, the groove may be provided not on the whole surface of the rotating plate 5 but on a part thereof, for example, only the peripheral part. Further, the slip prevention groove 37 is not limited to the configuration curved in a curved line as shown in FIG. 6, but may be extended in a radial straight line.

As means for preventing slippage, the rotating plate 5
All or part of the surface may be satinized, or a baffle may be provided on the rotating plate 5.

(Embodiment 3) As Embodiment 3, a description will be given of an air supply device 21 in which a swirling airflow generating means is added. FIG. 10 is an explanatory diagram showing a configuration of a CF device according to Embodiment 3 of the present invention, and FIG.
It is explanatory drawing which shows the state of the air blow from. In addition, the air supply device 2
Structures other than 1 are the same as those of the CF device of FIG.

Here, in the apparatus shown in FIG. 1, the air blown from the air supply device 21 is sent vertically onto the rotating plate 5 and subjected to granulation and drying. However, as described above, since the air flow there is linear, the air easily blows through the rotating plate 5 and the circulation time there tends to be short.

Therefore, in the apparatus according to the third embodiment, FIG.
As shown at 0 and 11, an agitator (air guide plate) 38 is provided in the air supply device 21 to generate a swirling airflow, thereby improving processing efficiency. That is, in the device, the air supply device 2
A plurality of agitators 38 are provided in one air supply port 23, whereby a swirling wind is supplied onto the rotating plate 5. The agitator 38 is a crescent-shaped steel plate having a thickness of about 5 to 10 mm, and is arranged radially on the inner wall of the air supply port 23. Then, between the adjacent agitators 38, a wind guide path 39 is formed in a radial spiral.

The air guide path 39 is formed from the upper part of the air supply port 23 to the opening part 23a.
As shown in FIG. 11, the air is sent onto the rotating plate 5 as a swirling airflow. Thereby, a swirling motion can be imparted to the granular material on the rotating plate 5, and the granular material is spirally wound up like a rope. Therefore, the rolling of the granular material can be promoted, and the processing efficiency can be improved. In addition, it is possible to prevent the air flow from blowing through linearly as shown by the broken line in FIG. 11, and it is possible to prolong the contact time between the air flow and the granular material. Therefore, the residence time of the airflow in the granular material layer is prolonged, and the drying efficiency can be improved.

In the apparatus shown in FIGS. 4 and 5, the branch pipe 28 and the straight pipe section 25 are arranged obliquely in the direction of rotation of the rotating plate 5, and gas is supplied onto the rotating plate 5 along the direction of rotation. By doing so, a swirling airflow can be obtained. Further, the shape of the agitator 38 is not limited to the crescent shape, and may be, for example, a rectangular plate obtained by twisting a band plate material, as long as it can form the radiation spiral air guide path 39.

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

For example, in the first embodiment described above, the heat insulation chamber 33 is evacuated to prevent dew condensation on the fixed wall 7. However, hot water, heated oil, or the like is supplied into the heat insulation chamber 33 and fixed. The temperature of the wall 7 may be prevented from lowering. Further, instead of adopting the double wall structure, the fixed wall 7 itself can be electrically heated or induction heated.

The first to third embodiments, such as applying the configuration of the second and third embodiments to a modification of the first embodiment, etc.
Needless to say, 3 can be appropriately combined.

[0074]

According to the centrifugal rolling granulator of the present invention, the fixed wall is surrounded by the outer wall, and the heat insulating space is formed between the fixed wall and the outer wall. Is shut off, and transmission of heat of the outside air to the fixed wall can be suppressed. Therefore, it is possible to prevent the fixed wall from being cooled by the outside air and to prevent the formation of dew on the inner surface thereof, and it is possible to suppress the adhesion of the granular material to the inner surface of the fixed wall. For this reason, the washing operation is eased, the product yield and the operation efficiency of the apparatus are improved, and the production efficiency and the like can be improved.

Further, the provision of the slip prevention means in the powder contacting portion of the rotating plate prevents the powdery material from slipping on the rotating plate, strengthens the centrifugal grip, and enhances the powdery and granular material. Rolling is activated. Therefore, it is possible to reliably perform the centrifugal rolling granulation of the granular material, and it is possible to achieve high-speed rotation of the rotating plate, tight granulation, improvement of small-volume processing capability, and the like.

Further, by providing the air supply means with a swirling airflow generating means for supplying swirling air onto the rotating plate, a swirling motion can be imparted to the granular material on the rotating plate, and the rotation of the granular material can be achieved. The movement is promoted, and the processing efficiency can be improved. In addition, it is possible to prevent the airflow from blowing straight out, and it is possible to prolong the contact time between the airflow and the granular material,
The residence time of the airflow in the granular material layer is prolonged, and the drying efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a centrifugal rolling granulation coating apparatus according to a first embodiment of the present invention.

FIG. 2 is an explanatory view showing a part of the CF device of FIG. 1 in a cutaway manner.

FIG. 3 is an explanatory view showing an arrangement state of the air supply device, and shows a state in which a ceiling portion of a centrifugal rolling chamber is omitted and the air supply device is viewed from above.

FIG. 4 is an explanatory diagram showing a modification of the air supply device.

FIG. 5 is an explanatory view showing a modification of the air supply device, and (a).
Is a cross-sectional view, and (b) shows a state where the ceiling portion of the centrifugal rolling chamber is omitted and the air supply device is viewed from above.

FIG. 6 is an explanatory diagram showing a configuration when a rotating plate according to a second embodiment of the present invention is viewed from above.

FIG. 7 is a perspective view of the rotating plate of FIG. 6;

FIG. 8 is an explanatory view showing a configuration of a slip prevention groove;
(A) is for left rotation and (b) is for right rotation.

9A and 9B are cross-sectional views of the anti-slip groove, where FIG. 9A is for left rotation and FIG. 9B is for right rotation.

FIG. 10 is an explanatory diagram illustrating a configuration of a CF device according to a third embodiment of the present invention.

FIG. 11 is an explanatory diagram showing a state of blowing air from an air supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Centrifugal rolling granulation coating apparatus 2 Granular material 3 Centrifugal rolling part 4 Rotation driving part 5 Rotating dish 5a Central part 5b Inclined part 6 Centrifugal rolling chamber 7 Fixed wall 7a Powder contact part 7b Air supply port 8 Rising part 9 Supply pipe 9a Input port 10 Slit air 11 Fluid chamber 12 Gap 13 Motor (rotation drive means) 13a Shaft 14 Casing 15 Spray nozzle 21 Air supply device (air supply means) 22 Dry air 23 Air supply port 23a Opening 23b Lower edge 25 Straight pipe section 28 Branch pipe 32 Outer wall (condensation prevention means) 33 Insulated chamber (insulated space; condensation prevention means) 34 Spacer 35 Exhaust port 36 Vacuum pump (pump device; condensation prevention means) 37 Slip prevention groove 37a Side wall 37b Side wall 38 Agitator (Wind guide plate) 39 Wind guide path H Upper position L Lower position

[Procedure amendment]

[Submission date] June 29, 2000 (2006.2.
9)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 8

[Correction method] Change

[Correction contents]

FIG. 8

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 9

[Correction method] Change

[Correction contents]

FIG. 9

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Mamoru Shiratori 2-14-2 Takadanobaba, Shinjuku-ku, Tokyo F-Term Industry Co., Ltd. F-term (reference) 4B048 PE02 PE10 PN02 PN06 PS01 PS20 4C076 AA32 AA61 BB01 FF04 GG12 GG16 GG32 GG33 4G004 BA00 JA01

Claims (12)

[Claims] 1. A fixed wall having at least a circular cross section of a powder contacting portion with a granular material, and a gap provided at a predetermined interval inside the fixed wall. A centrifugal rolling granulator comprising: a rotating rotating plate; and an air supply unit disposed above the rotating plate and close to the rotating plate and configured to supply gas to an upper surface of the rotating plate. The centrifugal tumbling granulator, wherein the fixed wall has a dew condensation preventing means for preventing dew condensation generated on an inner surface of the fixed wall. 2. The centrifugal rolling granulator according to claim 1, wherein the dew condensation preventing means includes an outer wall surrounding the fixed wall, and a heat insulating space formed between the fixed wall and the outer wall. A centrifugal tumbling granulator characterized by having. 3. The centrifugal rolling granulator according to claim 1, wherein said dew condensation preventing means further comprises a pump device for sucking air in said heat insulating space. apparatus. 4. The centrifugal rolling granulator according to claim 1, wherein the adiabatic space is filled with a gas having a pressure lower than atmospheric pressure. Granulation equipment. 5. The centrifugal rolling granulator according to claim 4, wherein the pressure of the gas in the heat insulating space is 1.33 Pa or less. 6. A fixed wall having a circular cross section of at least a powder contacting portion with a granular material, and a gap provided at a predetermined interval inside the fixed wall. A centrifugal rolling granulator comprising: a rotating rotating plate; and an air supply unit disposed above the rotating plate and close to the rotating plate and configured to supply gas to an upper surface of the rotating plate. A centrifugal rolling granulator characterized in that the surface of the powder contact portion of the rotating dish is formed smoothly. 7. A centrifugal rolling granulator according to claim 6, wherein a slip prevention means for preventing slipping of the granular material in the powder contact portion is provided in the powder contact portion of the rotary dish. Centrifugal granulator. 8. The centrifugal rolling granulator according to claim 7, wherein said slip preventing means is a radial groove formed in a powder contact portion of said rotary dish. Granulation equipment. 9. The centrifugal rolling granulator according to claim 8, wherein the groove is formed such that a side wall on the rotation direction front side of the rotary dish is formed on a gentler slope than a side wall on the rotation direction rear side. A centrifugal rolling granulator characterized in that: 10. A fixed wall having a circular cross section at least in contact with the powder and granule, and a fixed space provided inside the fixed wall with a predetermined gap therebetween, and a rotation driving means for providing a horizontal direction. A centrifugal rolling granulator comprising: a rotating rotating plate; and an air supply unit disposed above the rotating plate and close to the rotating plate and configured to supply gas to an upper surface of the rotating plate. The centrifugal rolling granulation apparatus, wherein the air supply unit includes a swirling airflow generating unit that supplies a swirling wind onto the rotating dish. 11. The centrifugal rolling granulator according to claim 10, wherein said swirling airflow generating means is a baffle plate provided in said air supply means. apparatus. 12. A fixed wall having a circular horizontal cross section of at least a powder contacting portion with a granular material, and a gap provided at a predetermined interval inside the fixed wall. A centrifugal rolling granulator comprising: a rotating rotating plate; and an air supply unit disposed above the rotating plate and close to the rotating plate and configured to supply gas to an upper surface of the rotating plate. The air supply means is disposed in a state of being inclined from above the rotating dish toward a rotating direction of the rotating dish, and supplies gas along the rotating direction to the rotating dish to supply swirling airflow. And a centrifugal rolling granulator.