JP2011031126A - Pan coating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pan coating apparatus equipped with baffles increasing agitation capacity without causing lowering of cleaning performance nor increase of manufacturing cost. <P>SOLUTION: The pan coating apparatus 1 is provided with baffles 32 located in a hollow rotating drum 2. The baffles 32 are arranged on an inner wall 3a extending obliquely relative to the rotational direction X of the drum 2, and adjacent baffles 32 are tiltedly arranged opposite to each other relative to the rotational direction X. The baffles 32 are each provided with a tilted wing 32b having an action surface 33 provided forward tiltedly toward the rotational direction X, and also with a holding section 34 formed on the front side of the baffle 32 in the rotational direction X including the action surface 33. When the drum 2 is rotated, an object to be treated is held in the holding section 34, and the object to be treated held in the holding section 34 is moved laterally with the rotation of the drum 2 and agitated and mixed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pan coating apparatus that performs a coating process or the like of a granular material using a rotating drum, and more particularly to an improvement in the stirring ability of a baffle member that is installed in a rotating drum and promotes mixing and stirring of the granular material.

  2. Description of the Related Art Conventionally, a granulation coating apparatus (pan coating apparatus) using a rotating drum is known as a manufacturing apparatus for pharmaceuticals and foods. For example, Patent Document 1 discloses a device that rotates a rotary drum having a circular cross section around a horizontal axis. Such a rotating drum is also called a coating pan, and a spray device for supplying a coating liquid is installed inside. The granular material thrown into the rotating drum rolls along with the rotation of the drum, and the coating liquid is sprayed on the surface from the spray device. At that time, hot air and cold air are appropriately supplied and exhausted into the rotating drum, and the formation and drying of the coating layer are promoted.

  Further, in the pan coating apparatus, a baffle for disturbing the rolling flow of the granular material is arranged in the rotating drum in order to improve the mixing and stirring efficiency. Conventionally, the following two types are known as such baffles. That is, there are known a “vertical baffle” attached perpendicularly to the inner wall surface of the drum and a “retracted inclined baffle” in which the baffle tip is inclined rearward with respect to the rotation direction. These baffles are attached at an angle of 30 to 45 ° with respect to the drum rotation direction, so that the object to be processed such as tablets is not scooped up with the rotation of the drum.

Japanese Unexamined Patent Publication No. 7-328408 Special table 2009-505655 U.S. Pat.No. 4,188,130

  However, in the above-described vertical baffle, it is necessary to increase the baffle in order to improve the stirring and mixing property. When the baffle is made high, the spray liquid from the spray device is likely to be applied, contamination due to the spray is likely to occur, the frequency of the cleaning operation is increased, and the cleaning performance of the baffle is also reduced. For this reason, the coating base material is not effectively used as an object to be processed, and the efficiency is lowered. In addition, the number of cleaning work steps is increased, and the product manufacturing cost is increased. In addition, in the vertical baffle, when the baffle comes out from the workpiece layer as the pan rotates, it is impossible to hold the workpiece, so that many workpieces placed on the baffle are immediately removed from the baffle. It will fall out. For this reason, there existed a problem that there was no movement to the side of a to-be-processed object, and stirring property was scarce.

  On the other hand, the receding inclined baffle itself has a structure that makes it difficult to lift up the object to be processed, so that the object to be processed is not lifted high, and the object to be processed is not dropped from a high position. There is a merit that it is hard to damage. However, on the other hand, there is a demerit that it is difficult to move the object to be processed in the lateral direction and the stirring ability is lowered, and in order to improve the stirring ability, it is necessary to increase the number of installed baffles and increase the manufacturing cost of the apparatus. In addition, an increase in man-hours for cleaning is inevitable.

  Further, Patent Document 2 discloses a baffle provided with a hook-shaped protrusion at the distal end thereof, but if such a protrusion is provided, the object to be processed is not lifted high. There is a possibility that the tablet or the like may be cracked by dropping from a high place. The apparatus of Patent Document 2 is intended exclusively for meat, in which there is no need to consider cracks in the object to be processed, and lateral mobility is not a problem. For this reason, although a baffle like patent document 2 can be employ | adopted for foods with high viscosity, such as meat products, it cannot be said that it is very suitable for the processing apparatus of the granular material with high fluidity | liquidity.

  In other words, with conventional baffles, there are no options other than increasing the number of baffles or increasing the number of baffles in order to improve the stirring capacity. In exchange for improving the stirring capacity, the cleaning performance and equipment manufacturing cost are sacrificed. There was a problem that had to be done.

  The objective of this invention is providing the pan coating apparatus provided with the baffle which can improve stirring ability, without causing the fall of a washability and the increase in apparatus manufacturing cost.

  A pan coating apparatus according to the present invention includes a hollow processing container that is rotatably arranged around a rotation axis, and a baffle that is installed in the processing container and that mixes and stirs an object to be processed accommodated in the processing container. The pan coating apparatus is provided, wherein the baffle is disposed on an inner wall of the processing container so as to extend obliquely with respect to the rotation direction X of the processing container, and is inclined forward toward the rotation direction X. An inclined wing having a working surface provided in a state, and the working surface is formed on the front side in the rotation direction X of the baffle, and moves in a lateral direction while holding the object to be processed when the processing container rotates. And a holding portion.

  In the present invention, the baffle is disposed so as to extend obliquely with respect to the processing container rotation direction X, and an inclined blade having a working surface provided in a forward-tilting state toward the rotation direction X is provided on the baffle. In addition, by forming a holding portion that moves in the lateral direction while holding the object to be processed when the processing container is rotated in a form including this working surface, the stirring and mixing property of the object to be processed can be improved, which is less than before. With the number of baffles, it becomes possible to obtain a stirring and mixing property equal to or higher than that of the conventional one.

  Further, the angle θ1 formed by the tip edge of the baffle and the drum rotation direction X may be set to 20 ° to 50 °, preferably 30 ° to 45 °. By setting the angle θ1 in these ranges, The holding of the object to be processed and the movement in the lateral direction are adjusted in a well-balanced manner, and the object to be processed held in the holding part moves moderately in the horizontal direction and is detached from the baffle without being lifted high. For this reason, for example, even when a tablet coating process is performed, the tablet is hardly damaged and the product quality is improved.

  Furthermore, the angle θ2 formed between the extension line of the working surface and the inner wall surface of the processing vessel may be set to 45 ° or more and less than 90 °, preferably 60 ° to 85 °, and the angle θ2 may be set within these ranges. By setting, the holding of the object to be processed and the movement in the lateral direction are adjusted with good balance, and the object to be processed is efficiently stirred and mixed. For this reason, the coating process proceeds uniformly, and the product quality can be improved, for example, the variation in the color of the object to be processed can be suppressed.

  Further, an angle θ2 formed between a line connecting the upper end of the working surface and the rear end point of the holding portion and the inner wall surface of the processing container is set to 45 ° or more and less than 90 °, preferably 60 ° to 85 °. However, by setting the angle θ2 in these ranges, the holding of the object to be processed and the movement in the lateral direction are adjusted in a balanced manner, and the object to be processed is efficiently stirred and mixed. For this reason, the coating process proceeds uniformly, and the product quality can be improved, for example, the variation in the color of the object to be processed can be suppressed.

  On the other hand, the baffle may be formed in a hollow structure, or the baffle may be air permeable.

  According to the pan coating apparatus of the present invention, it is provided with a hollow processing container arranged to be rotatable around a rotation axis, and a baffle for mixing and stirring the object to be processed which is installed in the processing container and accommodated in the processing container. In the pan coating apparatus, the baffle is arranged so as to extend obliquely with respect to the rotation direction X of the processing container, and the inclined blade having the working surface provided in the forward inclined state toward the rotation direction X is used as the baffle. Since the holding part that moves and moves the processing object while holding the processing container is formed in a form that includes this working surface, stirring of the processing object is possible compared to conventional vertical baffles and receding inclined baffles. Mixability can be improved.

  For this reason, it is possible to obtain the same or better agitation / mixability with a smaller number of baffles than before, and to ensure the agitation / mixability while keeping the baffle size small. It is improved, and it becomes possible to reduce the product manufacturing cost. Furthermore, since it is possible to obtain high agitation and mixing properties without raising the object to be processed to a high position and dropping it, damage to the object to be processed such as a tablet can be reduced. Therefore, by using the pan coating apparatus of the present invention, it is possible to ensure the uniformity of the coating layer, which is important for pharmaceuticals and other coating products, while improving the product quality while reducing the product manufacturing cost.

It is explanatory drawing which shows the structure of the pan coating apparatus which is one Example of this invention. It is explanatory drawing which shows the structure of the baffle provided in the main trunk | drum. It is an expanded view of the main trunk | drum. It is sectional drawing of a baffle. It is the table | surface which showed the relationship between baffle arrangement | positioning angle | corner (theta) 1, stirring ability, and a raising height. It is a graph which shows the relationship between baffle inclination-angle (theta) 2 and the variation in the yellowness of a tablet. It is the table | surface which showed the relationship between inclination | tilt angle (theta) 2, stirring ability, and a lifting height. (A)-(f) is explanatory drawing which shows the modification of a baffle. It is explanatory drawing which shows the other modification of a baffle.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing a configuration of a pan coating apparatus according to an embodiment of the present invention. The pan coating apparatus 1 in FIG. 1 coats powder particles in the drum 2 by the rotation of a rotating drum 2 (hereinafter abbreviated as “drum 2”) and the processing gas and coating liquid passing therethrough. A desired process such as drying or mixing is performed.

  The pan coating apparatus 1 has a drum 2 that is a horizontal drum-shaped processing container that accommodates an object to be processed such as tablets and confectionery. The drum 2 rotates around a horizontal rotation shaft, and includes a hollow cylindrical main body 3 and conical parts 4 a and 4 b provided on both ends of the main body 3 in the axial direction. The main body portion 3 has a polygonal or cylindrical cross-sectional shape, and has an octagonal cross section in the pan coating apparatus 1 of FIG. The conical parts 4a and 4b are provided on both end sides of the main body part 3, and are formed in a tapered shape whose outer diameter decreases along the axial direction.

  Ventilation portions 5 made of a perforated plate are provided at several places or all around the main body portion 3. The ventilation portion 5 is formed of a perforated plate, and here, is formed on each side of the main trunk portion of the octagonal cross section. In addition, the structure of the ventilation | gas_flowing part 5 is not limited to a perforated plate, What is necessary is just to hold | maintain to-be-processed objects, such as a mesh and a screen, and to have air permeability. A jacket 6 is attached to the outer peripheral side of the main trunk portion 3 so as to cover the ventilation portion 5. The inside of the jacket 6 is partitioned into a plurality of ventilation chambers 7 corresponding to the ventilation portions 5 on each side.

  An air supply / exhaust passage 8 is connected to the jacket 6 on the conical portion 4a side. The air supply / exhaust passage 8 is individually provided for each ventilation chamber 7 and is partitioned by a partition wall. The air supply / exhaust path 8 extends from the jacket 6 to the end of the drum 2 along the outer surface of the conical portion 4a, and a vent hole 11 is formed at the end. A drum unit 31 that is a rotating portion of the pan coating apparatus 1 is formed by the air supply / exhaust passage 8 including the drum 2, the jacket 6, and the vent hole 11.

  In the vicinity of the end of the drum unit 31, an external duct 12 for supplying and exhausting air is disposed. The external duct 12 has a disk valve mechanism that is connected in communication with the vent 11 that has come to a predetermined position as the drum unit 31 rotates. The external duct 12 is further connected to a supply / exhaust conduit 13a. A sink 25 is provided below the drum unit 31 for storing the wash water that has flowed down from the disk valve mechanism during drum washing. A discharge drain 27 having a valve 26 is attached to the sink 25.

  In the drum 2, an internal duct 14 connected to the air supply / exhaust conduit 13b is provided. Further, a spray gun (not shown) for supplying a coating material is provided in the drum 2. For example, a processing gas such as hot air, hot air, or cold air is supplied to the drum 2 through the internal duct 14 from the air supply / exhaust conduit 13b. The air supplied from the internal duct 14 into the drum 2 flows into the jacket 6 through the ventilation part 5. The air flowing into the jacket 6 passes through the air supply / exhaust passage 8 and reaches the air vent 11 and is discharged from the external duct 12 connected to the outside through the air supply / exhaust conduit 13a.

  The drum 2 is attached with a rotating shaft 16 supported by a bearing 15. The rotating shaft 16 is disposed substantially horizontally, and the drum 2 can rotate around the rotating shaft 16. The rotating shaft 16 is driven by a motor 17 via a chain 18. In the pan coating apparatus 1 of FIG. 1, the supply / exhaust conduits 13 a and 13 b, the external duct 12 and the internal duct 14 are fixed, and the drum 2, the jacket 6 and the supply / exhaust passage 8 are rotated by a motor 17.

  An opening 19 is formed in the substantially central part of the conical part 4a. The opening 19 is arranged with a predetermined gap with respect to the right end of the door frame 21 in the figure. An openable / closable inspection lid 22 is provided on the left end side of the door frame 21. A product discharge port 23 is provided at the lower portion of the door frame 21. The product discharge port 23 is provided with a valve, from which the product in the drum 2 is discharged to the transport container 24.

  On the other hand, a baffle 32 is attached to the inner peripheral surface of the main body portion 3 to promote mixing and stirring of the granular material. FIG. 2 is an explanatory view showing a configuration of the baffle 32 provided in the main body 3, and FIG. 3 is a development view of the main body 3. As shown in FIG. 2, eight baffles 32 are equally attached to the inner wall 3 a of the main body 3. As shown in FIG. 3, each baffle 32 is disposed on the inner wall 3 a so as to extend obliquely with respect to the rotation direction X of the drum 2, and adjacent baffles 32 are opposite to each other in the drum rotation direction X. It is arranged in an inclined state. In the pan coating apparatus 1 according to the present invention, the baffle 32 has a tip edge 32p inclined by an angle θ1 (20 ° to 50 °, preferably 30 ° to 45 °, typically 30 °) with respect to the rotation direction X. It is arranged in the state.

  FIG. 4 is a cross-sectional view of the baffle 32. As shown in FIG. 4, the baffle 32 has a bent shape. In this embodiment, the cross section has a substantially “<” shape. In the baffle 32, one side of the "<" character is longer than the other side, and the short other side is a base 32a and the longer side is an inclined wing 32b. The surface of the inclined blade 32b facing the rotation direction X is a working surface 33 that comes into contact with the granular material during drum rotation. The action surface 33 is provided in a forward inclined state in the drum rotation direction X with respect to the main body inner wall 3a. An inclination angle θ2 of the working surface 33 with respect to the inner wall surface (an angle formed by the extension line and the tangent to the inner wall 3a at a position where the extension line of the working surface 33 intersects the main body inner wall 3a) is 45 ° or more and less than 90 °. Preferably, it is formed at 60 ° to 85 °. The baffle 32 includes a holding portion 34 on the front side in the rotational direction X so as to include the action surface 33. When the drum 2 rotates, the object to be processed is held in the holding part 34, and the object to be processed held in the holding part 34 moves in the lateral direction (longitudinal direction of the baffle 32) as the drum 2 rotates. To do.

  In such a pan coating apparatus 1, the coating process of a granular material is performed as follows. Here, first, the granular material is put into the drum 2, and the motor 17 is driven to rotate the drum 2 in the forward rotation direction via the chain 18 and the rotating shaft 16. As the drum 2 rotates, the baffle 32 enters the workpiece layer one after another, and leaves the workpiece layer in such a manner that the workpiece such as a tablet is held by the inclined blade 32b. As shown by the broken line S in FIG. 3, the workpiece scooped up by the inclined blade 32b slides down in the baffle 32 inclined with respect to the drum rotation direction X in the lateral direction (axial direction), and the baffle It is discharged from the end in the direction of the conical parts 4a and 4b.

  In other words, the object to be processed is surely moved in the lateral direction while being held in the baffle 32 as the drum 2 rotates, and is effectively stirred and mixed. At this time, in the pan coating apparatus 1 of the present invention, the adjacent baffles 32 are alternately arranged in reverse inclination, so that the object to be processed held in the baffles 32 is distributed to the left and right for each baffle. Move in shape. For this reason, the object to be processed in the baffle 32 is alternately discharged to the conical part 4a side and the 4b side, and the object to be processed is efficiently stirred and mixed.

  Further, since the baffle arrangement angle θ1 is set to 20 ° to 50 °, preferably 30 ° to 45 °, the holding of the object to be processed and the movement in the lateral direction are adjusted with a good balance. FIG. 5 is a table showing the relationship between the baffle arrangement angle θ1, the stirring ability and the lifting height. According to the experiments by the present inventors, the stirring ability is higher when the angle θ1 is larger, and the lifting height is lower when the angle θ1 is smaller, and the two are in a trade-off relationship. Among them, the above-mentioned 20 ° to 50 ° can be selected as a range in which the stirring ability and the lifting height can be practically used, and further, a range of θ1 = 30 ° to 45 ° can be selected as a well-balanced range. You can choose. By setting θ1 in such a range, the object to be processed held in the holding portion is appropriately moved in the lateral direction without being lifted high, and is separated from the baffle and stirred. For this reason, even when the tablet coating process is performed, the tablet is hardly damaged and the product quality is improved.

  In the pan coating apparatus 1, while the workpiece is stirred and mixed in this manner, the coating material is sprayed as necessary, or a processing gas is supplied into the drum 2 to coat the powder. Etc. At that time, the processing gas is supplied into the drum 2 from the air supply / exhaust conduit 13b through the internal duct 14, and from the vent 5 to the jacket 6 → the air supply / exhaust passage 8 → the vent 11 → the external duct 12 → the air supply / exhaust conduit 13a. It flows and is discharged out of the device. Then, the finished product is taken out from the product outlet 23 and transferred to the transport container 24.

  Here, the stirring and mixing property by the baffle 32 has a correlation with the inclination angle θ2 of the inclined blade 32b holding the object to be processed, and the inclination angle needs to be increased to some extent. On the other hand, when the inclination angle θ2 is increased, the workpiece is lifted up correspondingly, and the workpiece may jump out of the drum 2 or the product may be damaged if the workpiece is weak. obtain. Accordingly, as a result of various experiments conducted by the inventors to obtain the optimum inclination angle θ2, the angle is preferably more than 45 ° to less than 90 °, and when it is desired to ensure stirring and mixing properties or to reduce scraping. It was found that stirring and mixing properties higher than those of conventional machines can be obtained by appropriately adjusting the angle in the range of 60 ° to 85 °.

  FIG. 6 is a graph showing the relationship between the inclination angle θ2 and the variation in the yellowness of the tablet. The baffles with different inclination angles θ2 (conditions other than θ2) were applied to the pan coating apparatus “HC-FPC-95” manufactured by Freund Sangyo Co., Ltd. Shows the result when the coating process is performed with the same. FIG. 7 is a table showing the relationship between the baffle inclination angle θ2, the stirring ability and the lifting height. In FIG. 6, the vertical axis represents CV value (Coefficient of Variation) = (standard deviation / average value) × 100 (%). The horizontal axis is spray amount = (spray mass (solid content) / tablet mass) × 100 (%). For example, when a 10 kg tablet is charged in the drum 2, a liquid with a solid content of 0.1 kg is added. The blown state is 1% of the spray amount. The processing conditions in the table of FIG. 7 are the same as those in FIG.

  Here, a placebo tablet is sprayed with an aqueous solution containing TC-5R (HPMC: hydroxypropyl methylcellulose) 8% as a coating base, 0.8% PEG 6000 (polyethylene glycol) as a plasticizer, and 0.03% of Yellow No. 5. Sampling was performed when the weight increased by 0.5, 0.75, 1.0, 1.25, 1.5, and 2.0%. Of these, 20 randomly selected tablets were measured for yellowness index (measuring instrument: “SZ-Σ90” manufactured by Nippon Denshoku Co., Ltd.), and their CV values were graphed. Since the CV value tends to decrease as the color unevenness of the tablet decreases, the CV value was used as an index of the stirring and mixing property of the pan coating apparatus.

  As can be seen from FIG. 6, when the inclination angle θ2 is 85 ° and 75 °, 75 ° is higher in stirring and mixing properties, and in particular, 75 ° at the time when the spray amount is 0.5 to 0.75%, where color unevenness is likely to occur. Was more effective. It was also found that there was not much difference in stirring and mixing at 75 ° and 45 °. On the other hand, as can be seen from FIG. 7, it was found that a range of more than 45 ° and less than 90 ° can be adopted as a range where the stirring ability and the lifting height are practically acceptable as viewed from the inclination angle θ2. Further, among them, θ2 = 60 ° to 85 ° is preferable, and it was also found that the balance between the two is good when θ2 = 75 °. Therefore, when these are judged comprehensively, it has been found that the value of θ2 is preferably 60 ° to 85 °, particularly θ2 = 75 °.

  As described above, by adopting the baffle 32 as described above as the stirring and mixing means of the pan coating apparatus 1, the stirring and mixing performance of the object to be processed can be improved as compared with the conventional vertical baffle and the receding inclined baffle. Therefore, it is possible to obtain a stirring and mixing property equal to or higher than that of the conventional one with a smaller number of baffles than the conventional one. In addition, since the stirring and mixing properties can be ensured while keeping the baffle size small, contamination due to spraying can be suppressed, the frequency of cleaning work and the cleaning properties of the baffles can be improved, and the product manufacturing cost can be reduced. Furthermore, since high agitation and mixing properties can be obtained without lifting and dropping the object to be processed to a high position, damage to the object to be processed such as tablets is small, and the yield of the product is improved. Product manufacturing costs can be reduced. The device manufacturing cost can be reduced by reducing the number of baffles and the height of the baffles.

  Therefore, by using the pan coating apparatus 1 of the present invention, the uniformity of the coating layer, which is important for pharmaceuticals and other coating products, is ensured while the product manufacturing cost is reduced, and the product quality is improved. In addition, it is easy to replace the conventional baffle with the baffle 32, and thus, it is possible to obtain higher agitation and mixing properties without greatly modifying the apparatus.

It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.
For example, the form of the baffle 32 is not limited to that shown in FIGS. 2 to 4, and various forms such as FIGS. 8A to 8F and FIG. 9 can be adopted. In this case, the baffle 41 in FIG. 8A has a configuration in which the baffle cross section is not bent and the base portion 32a referred to as the baffle 32 in FIG. 2 is not provided. An inclined blade 41b is erected on the inner wall 3a in a forward inclined posture, and the rotation surface X side of the inclined blade 41b is a working surface. The baffle 43 in FIG. 8B has a substantially “<” shape in cross section like the baffle 32, but both sides of the “<” shape are substantially the same length, or the inclined blade 43 b is The length is slightly longer than the base 43a. Also in this case, the rotation direction X side of the inclined blade 43b is the action surface 44.

  The baffle 45 in FIG. 8C has a substantially “W” cross section and includes a plurality of inclined blades (46a, 46b). Moreover, the action surface 47 and the holding part 48 are also provided two (47a, 47b; 48a, 48b). In this case, as the inclination angle θ2 of the working surface, as shown in FIG. 8C, the inclination angle of the first working surface 47a on the distal end side is adopted. In the baffle 49 of FIG. 8D, a base portion 49a is erected perpendicularly to the inner wall 3a, and an inclined blade 49b having the same length as or slightly longer than the base portion 49a is formed at the upper end thereof. Like the baffle 49, when the length of the vertically extending base portion 49a is ½ or more of the inclined blades 49b, the influence of the base portion 49a on the holding portion 34 is increased. For this reason, as shown in FIG. 8 (d), the inclination angle θ2 of the action surface 51 is the rear end closest to the inner wall 3a at the distal end portion P of the action surface 51 and the rearmost portion in the rotation direction X of the holding portion 34. It is preferable to adopt the angle of the angle formed by the line connecting the end point Q (here, the contact point between the base 49a and the inner wall 3a) and the inner wall surface.

  Further, in the baffle 52 of FIG. 8 (e), an inclined blade 52b having a curved action surface 53 is formed at an upper end portion of a base portion 52a erected perpendicularly to the inner wall 3a. Also in the baffle 52, θ2 is the rear end point Q closest to the inner wall 3a at the rear end portion P with respect to the rotation direction X of the working surface 53 and the holding portion 34 (here, the contact point between the base portion 52a and the inner wall 3a). This is the angle between the line connecting and the inner wall surface. In addition, the baffle 54 in FIG. 8 (f) includes an inclined blade 54b having a curved action surface 55, and has a configuration without the base 32a referred to in the baffle 32 in FIG. In this case, θ2 is the rear end point Q (here, the contact point between the inclined blade 54b and the inner wall 3a) that is closest to the inner wall 3a at the distal end portion P of the working surface 55 and the rearmost portion with respect to the rotation direction X of the holding portion 34. The angle between the line connecting the inner wall and the inner wall surface.

  On the other hand, the baffle 56 in FIG. 9 is formed of a perforated plate 57 such as a punching plate, and the inside of the baffle is hollow. Since such a baffle 56 has air permeability, a closed site does not occur in the main trunk portion 3. For this reason, it becomes possible to efficiently perform the coating process for tablets or the like that can efficiently supply the processing gas into the drum 2.

  In the above-described embodiment, the horizontal rotating drum type coating apparatus in which the rotating drum 2 rotates around the horizontal axis has been described. However, the axis does not have to be completely horizontal, but may be approximately horizontal. Absent. In the above-described embodiment, an example in which the present invention is applied to a so-called jacket type coating apparatus in which the air supply / exhaust jacket 6 is arranged on the outer periphery of the rotating drum 2 has been described. The present invention can also be applied to a jacketless type coating apparatus. Furthermore, the form of the rotating drum 2 is not limited to the octagonal cross section as described above, and the present invention can be applied to an apparatus including a rotating drum having a circular cross section. In addition, the adjacent baffles 32 do not necessarily have to be alternately arranged in reverse inclination, and a configuration in which adjacent baffles 32 are inclined in the same direction can also be employed.

1 Pan coating device 2 Rotating drum (processing container)
DESCRIPTION OF SYMBOLS 3 Main trunk | drum 3a Inner wall 4a, 4b Conical part 5 Ventilation part 6 Jacket 7 Ventilation chamber 8 Air supply / exhaust passage 11 Vent 12 External duct 13a, 13b Supply / exhaust pipe 14 Internal duct 15 Bearing 16 Rotating shaft 17 Motor 18 Chain 19 Opening part 21 Door frame 22 Inspection lid 23 Product outlet 24 Transport container 25 Sink 26 Valve 27 Discharge drain 31 Drum unit 32 Baffle 32a Base 32b Inclined blade 32p Tip edge 33 Working surface 34 Holding portion 41 Baffle 41b Inclined blade 42 Working surface 43 Baffle 43a Base 43b Inclined blade 44 Working surface 45 Baffle 46a, 46b Inclined blade 47 Working surface 47a, 47b Working surface 48 Holding portion 48a, 48b Holding portion 49 Baffle 49a Base 49b Inclined blade 51 Working surface 52 Baffle 52a Base 52b Inclined blade 53 Working surface 54 Baffle 55 Working surface 5 6 Baffle 57 Perforated plate P Front end Q Rear end point S Particle movement trajectory X Drum rotation direction θ1 Baffle arrangement angle θ2 Working surface inclination angle

Claims (8)

A pan coating apparatus comprising: a hollow processing container disposed rotatably around a rotation axis; and a baffle that is installed in the processing container and that mixes and stirs an object to be processed contained in the processing container. And
The baffle is disposed on the inner wall of the processing container so as to extend obliquely with respect to the rotation direction X of the processing container,
An inclined wing having a working surface provided in a forward inclined state toward the rotational direction X;
A holding part that includes the working surface on the front side in the rotation direction X of the baffle and moves the processing object in a lateral direction while holding the object to be processed when the processing container rotates. Coating equipment.   2. The pan coating apparatus according to claim 1, wherein an angle θ <b> 1 formed by the leading edge of the baffle and the drum rotation direction X is 20 ° to 50 °.   3. The pan coating apparatus according to claim 2, wherein the angle [theta] 1 is 30 [deg.] To 45 [deg.].   The pan coating apparatus according to any one of claims 1 to 3, wherein an angle θ2 formed by an extension line of the working surface and an inner wall surface of the processing container is more than 45 ° and less than 90 °. Pan coating equipment.   4. The pan coating apparatus according to claim 1, wherein an angle θ <b> 2 formed between a line connecting the upper end of the working surface and the rear end point of the holding portion and the inner wall surface of the processing container is 45 °. And a pan coating apparatus characterized by being less than 90 degrees.   6. The pan coating apparatus according to claim 4, wherein the angle [theta] 2 is 60 [deg.] To 85 [deg.].   The pan coating apparatus according to claim 1, wherein the baffle is formed in a hollow structure.   8. The pan coating apparatus according to claim 7, wherein the baffle has air permeability.

Images