JPS637816B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides granule coating for coating and drying various granules, such as applying sugar coating or film coating to granules of pharmaceuticals and food products formed into various shapes, and drying the granules. For more details regarding molding equipment, please see
This invention relates to a coating and forming device for granules that is improved so that when spraying a solvent or a dispersing agent onto the granules, the coating solvent or dispersing agent can be sprayed onto the granules effectively in a short period of time, or in other words, efficiently. .

Granules, for example, as mentioned above, granules of pharmaceuticals and foods are coated with sugar or film coating on their surfaces. Among these, especially when the granules are pharmaceuticals, the main drug (granules) is made to dissolve in the appropriate part of the body, so if the main drug absorbs moisture in the air, it will cause a decomposition reaction. will occur. Therefore, in order to prevent this reaction, we applied film coating to the main ingredient to stabilize its quality.
Alternatively, the main drug may be coated with sugar to make it easier to drink.

However, in order to apply film coating or sugar coating to the main drug, water must be used as a medium. That is, for example, after spraying a film coating liquid containing water as a medium onto a main agent contained in a coaching pan to form a film around the outer periphery of the main agent,
Water is evaporated, but since water is injected onto the main ingredient, which should originally dislike moisture, the spraying time and subsequent drying speed are important points in determining whether or not the main ingredient will change in quality.

Therefore, in a coaching pan where the main ingredient is coated with film or sugar coated, the machine performance is greatly influenced by how efficiently the coating liquid is sprayed and dried.

As described above, many proposals have been made to date for coating breads in which the main ingredient is film-coated or coated with sugar. For example, the coaching bread proposed by the present applicant includes Japanese Patent Publication No. 49-22702, Japanese Patent Publication No.
No. 38713 (US Patent No. 3834347), Special Publication No. 1987-
No. 7747 and JP-A-52-46567, etc. Each of these proposals is a highly practical proposal that has been improved to improve the performance of coaching pans. For example, in Japanese Patent Publication No. 50-38713, as shown in FIG. The outer circumferential surface of the container is covered with a suction duct 3, and the outer end of the duct 3 is communicated with the fixed exhaust pipe 4 at the rear of the container when the rotating container 1 rotates to a specific position. The air pipe opening 6 is made to face the part 5. and,
A granular main agent is put into the rotating container 1, and while the rotating container 1 is rotated, a solvent is injected onto the main agent by a coating solvent injection mechanism (not shown), and then hot air is blown from the air pipe opening 6 as shown by the arrow in FIG. I spray it on to dry the main drug. This coaching pan can store a large amount of granules,
It has advantages such as the ease of providing ribs on the inner surface of the rotating container 1 for inverting and stirring the granules of the main drug, etc., and the efficiency of hot air passing through the granules is better than that of a coaching pan in which porous holes are formed around the entire circumference of the rotating container. It is a useful invention.

However, even though it has the above-mentioned advantages, it does not mean that there are still unsolved problems. For example, when a coating solvent is injected, most of the solvent mist travels from the perforated plate 2 through the suction duct 3 to the communicating elongated hole 8 of the disc valve 7, and then escapes to the outside through the fixed exhaust pipe 4. Therefore, there are problems in that a large amount of coating solvent is required and the coating process takes a long time. According to experiments, this loss of coating solvent amounts to 15 to 30% or more of the sprayed amount, resulting in a considerable economic burden. Even if economic aspects are ignored, machine performance is greatly influenced by how efficiently and quickly the main agent can be coated and dried. However, if the coaching time is not shortened as much as possible, it cannot be called a high-performance device.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a granule coating apparatus that can efficiently spray a liquid or a dispersing agent onto granules in a short period of time.

In order to achieve this object, the present invention provides a coating molding device for granules, which stores granules in a rotating container, sprays a liquid or a dispersing agent onto the granules, and dries the granules. A path of hot air is formed so as to pass from the inside or outside of the rotating container through the accumulation part of the particles and out of the rotating container, and the hot air path is blocked when the liquid or spraying agent is sprayed. The present invention is characterized by a coating molding device for granules configured as follows.

Next, embodiments of the present invention will be described with reference to FIGS. 2 to 9.

In the first embodiment shown in FIGS. 2 to 6, the disc valve 7 of the coaching pan shown in FIG. By doing so, it is possible to coat the granules in the most efficient state when spraying the solvent to coat the granules.Hereinafter, we will mainly explain the components related to the disc valve 7. The symbols used in Figure 1 are also used. However, the present invention can also be applied to various types of devices other than the one shown in FIG.

First, in FIG. 1, on the rear surface of the rotary container 1, there are communication holes 9 at the outer ends of each suction duct 3 provided corresponding to the perforated plates 2 at several locations around the rotary container 1.
These communication holes 9 face the rotary container 1.
Rotating disk 1 of disk valve 7 formed into one body with
0 is drilled. The valve surface of the rotating disc 10 is formed in airtight sliding contact with the valve surface of the stationary disc 11. The fixed disk 11 includes:
A hot air passage blocking device 12 is provided, and this will be explained with reference to FIGS.
A communicating elongated hole 8 located on the same pitch circle as the pitch circle shown in FIG. 1 is formed. This communicating long hole 8
passes through a fixed plate 13 integrally formed on the back surface of the fixed disc 11 and reaches an exhaust duct 14,
As shown in FIG. 3, the communicating elongated hole 8 has both longitudinal ends near the upper edge 15 and the lower edge 16 of the upper surface of the particle accumulation surface when the particle accumulation amount A is the largest. It is formed to be located. Additionally, bottomed grooves 17 and 18 extend from both longitudinal ends of the communication elongated hole 8 along the pitch circle. In these bottomed grooves 17 and 18, as shown in FIG.
A bottomed groove 18 is formed beyond this point. The bottomed grooves 17 and 18 of the fixed disc 11 formed in this way
As shown in FIG. 5, shutters 20, 20 each having an inverted L-shaped cross section are slidably fitted therein. Shutter surface 2 of these shutters 20, 20
2 is formed to be at the same height as the valve surface 11a of the fixed disc 11, and a support piece 23 that supports this shutter surface 22 is fitted to slide within the guide groove 18, The outer end is a fixed plate 13
It reaches the rear of the. An operating mechanism, for example a gear 24, is formed near the outer end of the support piece 23, and a worm 25 meshes with the gear 24. A gasket 26 is provided at a position facing the guide groove 19 on the back surface of the fixed plate 13, so as to close the guide groove 19 where the support pieces 23 of the shutters 20, 20 are not located.

Now, when a large number of granules are housed in the rotating container 1 shown in FIG. 1 and the rotating container 1 is rotated in the direction of the arrow, the granules accumulating section is tilted in the direction of rotation as shown in FIG. 3. The granules are positioned in this manner and are stirred while rolling within the rotating container 1. When this state is reached, a coating solvent is sprayed onto the particle accumulation portion by a coating solvent spraying mechanism (not shown). Prior to this injection, the shutters 20, 20 are rotated by rotating the worm 25 shown in FIGS. 2 and 3.
are moved toward each other, and the shutters 20,
By bringing the opposing end surfaces of 20 into contact with each other, the communicating elongated hole 8 is closed and the hot air passage is blocked. This results in
Since the coating solvent sprayed onto the grain accumulation section does not escape to the outside from the hot air passage, the grains can be coated in a short time by simply spraying a small amount of the coating solvent onto the grains. Requiring less coating solvent means, in other words, that the amount of moisture adhering to the granules can be minimized, and furthermore, when developed, it also means that the drying time can be shortened. Therefore, it is particularly effective when the granules are, for example, pharmaceuticals that dislike moisture. After the coating solvent is injected onto the particles in this way, the shutter 20,
20 are moved in the direction away from each other, and the openings of the communicating elongated holes 8 are opened according to the amount of particles accumulated. Then, hot air is sent into the rotating container 1 from the air duct opening 6 (FIG. 1). At this time, when the amount of the granule accumulation section is small, the worm 25 is turned to move the shutters 20, 20 toward each other so that the hot air passes through the granule accumulation section in the most efficient manner. do. As the work progresses, if the amount of accumulated particles in the particle accumulating section increases or becomes bulky, the shutter 2
If the worm 25 is rotated in a direction in which 0 and 20 are further spaced apart, the hot air can be passed through the particle accumulating section in the most efficient manner. In this way, the opening and closing of the shutters 20, 20 adjusts to the increase/decrease in the amount of granules accumulated and/or changes in the volume, allowing hot air to be used most effectively for drying the granules, resulting in a high-quality finish, especially when the granules are chemicals. be able to.

A perforated plate having the same perforation pitch as this perforated plate 2 is placed on the outside of the perforated plate 2 shown in FIG. As shown,
The pitch P of the perforated plate 2 is shifted by 1/2 pitch to close the hole, and the suction duct 3 is connected to the communicating long hole 8 during drying.
When communicating with the exhaust duct 4 via, move one of the two overlapping perforated plates 2 by 1/2 pitch in the direction of arrow C in FIG. 7 to open the perforated plate 2,
When injecting the coating agent, when the suction duct 3 passes through the position where it communicates with the exhaust duct 4 through the communicating elongated hole 8, the perforated plate 2 is set so that it passes in the state shown in FIG. 7, that is, in the open state. The inside of the rotating container 1 may be cut off from the hot air passage. In this way, since the outer periphery of the rotating container 1 is closed when the coating agent is injected, the coating solvent does not reach the intake passage of the suction duct 3, and efficiency can be further improved. That is, in this case, by providing two perforated plates with holes of the same pitch at several locations on the outer peripheral wall of the perforated plate 2, powder leakage can be prevented at the position closest to the perforated plate 2 and the suction duct 3. can be prevented,
You can get the best effect.

In addition, as shown in FIG. 8, when the rotary container 1a has porous holes 2a on the entire outer circumference, the ventilation passage 3a
The shutter 20a may be placed in the opening in the same manner as shown in FIG.

Further, as shown in FIG. 9, porous holes 2b were formed all over the outer periphery of the rotary container 1b, and only the back surface of the particle accumulation section and the hot air inlet were opened, and the others were covered with partition plates 27. Even in this case, the shutter 20b may be arranged so that the opening on the back side of the particle accumulating section can be opened and closed in the same manner as shown in FIG.

Furthermore, even when the rotating container 1c is formed in the shape of a conveyor as shown in FIG. 10, a shutter 20c may be placed at the opening of the ventilation passage 3c so as to have the same effect as in FIG. 7.

In addition, as another embodiment of the present invention, as shown in the developed view in FIG. It is also possible to use a structure in which a perforated plate 1d, which is arranged movably in the direction of arrow C-D in the figure and has pores of the same pitch and shape as the perforated plate 2d, is wound around the perforated plate 1d in the shape of a drum. In this case, perforated plate 2
It is preferable that the length L ₂ of the pores in d be shorter than the length L ₁ of the pores in the perforated plate 1d, as shown in FIG. 11B. ₁ and P ₂ are equal. In this example,
The perforated plate 2d is constantly moved in the direction of arrow D by a spring or the like.
The rear end surfaces of these perforated plates 2d are received by the cam 30, and the cam plate 30a is moved in the direction of the arrow C-D by the actuator 31 only in the portion corresponding to the ventilation passage, thereby spraying the coating agent. At times, the cam plate 30a is moved in the direction of arrow C to shift the perforation pitch between the drum-shaped perforated plate 1d and the perforated plate 2d by half a pitch in the C-D direction to close the entire circumference of the rotating container. The cam plate 30a may be moved in the direction of arrow D to open only the holes corresponding to the hot air passages.

In each of the embodiments, the shutter may be adjusted automatically or manually, and its operating mechanism may be a combination of gears and racks, or
Actuators such as air cylinders may also be used.

In addition, in the above-mentioned embodiments, a hot air passage was formed so that hot air could flow from the inside of the rotating container through the particle accumulation section and out of the rotating container. from the outside of the rotating container, passing through the particle accumulation section and reaching the inside of the rotating container,
A hot air passage may be formed to pass through this to the outside of the rotating container. In this case, it is preferable to provide a Hepa filter or the like before the hot air reaches the particle accumulating section to remove contaminants contained in the hot air.

As described above, according to the present invention, when spraying a liquid or a dispersing agent onto granules, the work can be carried out efficiently in a short time, especially when the granules are pharmaceuticals, etc. Very good effects can be achieved, such as the ability to obtain high-quality drugs.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a conventional device;
Fig. 2 is a perspective view of a disc valve showing an embodiment of the present invention, Fig. 3 is an explanatory diagram of its operation, Fig. 4 is a sectional view taken along the line - Fig. 3, and Fig. 5 is a sectional view taken along the line - Fig. 6 is a sectional view taken along the line of FIG. 3, FIG. 7 is a stacked perforated plate shutter, and FIGS. 8 to 11 A.
and B are explanatory views showing other embodiments of the present invention, respectively. 1, 1a, 1b, 1c... rotating container, 3a, 3
c...Ventilation duct, 20...Inverted L-shaped shutter, 20
a, 20b, 20c... stacked perforated plate shutters.

Claims (1)

[Claims] 1 A granule coating and forming device that stores granules inside a rotating container, sprays a liquid or a dispersing agent onto the granules, and dries the granules, the hot air path for drying being connected to the inside of the rotating container or A coating forming device for granules, which is formed so that the granules pass through the accumulating part from the outside and exit the rotating container, and is configured to block the hot air passage when the liquid or spraying agent is sprayed.