JP2021181066A - Pan coating apparatus and coating method - Google Patents

Abstract

To provide a pan coating apparatus and a coating method which make tablets hardly stay on a spray gun in sugar coating treatment.SOLUTION: A pan coating apparatus 1 has a spray gun 23 for spraying a coating liquid to tablet layers 32 formed by the rotation of a rotary drum 2. The spray gun 23 can move in two divided areas A, B of the rotary drum 2, to the area B at an opposite side to the area A in which main parts 32a of the tablet layers 32 are formed. In a pause step and a dry step in sugar coating treatment, the spray gun 23 is evacuated to an upper limit position U set as a first quadrant among four quadrants existing in the area B and made by dividing the rotary drum 2 by a centerline Mv and a centerline Mh so that even when tablets 3 with adhesiveness are raised up to the upper part of the drum, the tablets 3 do not fall on the spray gun.SELECTED DRAWING: Figure 4

Description

The present invention relates to a pan-type coating device (pan coating device) that sprays a coating liquid onto tablets and powders to perform a coating treatment.

The coating treatment for an object to be treated such as a tablet (hereinafter, a tablet as an example is described as an example) performed by a pan coating device is roughly classified into a film coating in which a film is applied to a tablet with a water-soluble coating agent. , It is divided into a sugar-coated coating that covers the surface of the tablet with a sugar coating such as white sugar. Among them, in the film coating, the tablet is rolled in the pan coating device, the coating agent is sprayed, and the drying process (dry) is performed in parallel with the spraying. On the other hand, in sugar coating, the coating process is performed by repeating a cycle of spraying, a pose step, spreading the sugar coating on the tablet surface, and then drying.

Japanese Patent No. 6017197 Japanese Patent No. 5272778 Japanese Patent No. 4009464

In such a coating process, since the film coating is sprayed and dried at the same time, the adhesiveness of the tablet surface is low, and the tablet rolls without being lifted to the upper part of the pan. However, in the sugar coating, the concentration of the sugar coating liquid increases due to the spreading and drying treatment, and the tablet surface becomes sticky. Therefore, the tablet being rolled in the device may be lifted to the top of the pan and dropped due to this stickiness, and a part of it may be lifted to the upper part of the spray gun. Then, the tablet dropped from the upper part of the pan may be caught on the spray gun and stay there, which may cause a poor coating.

An object of the present invention is to provide a pan coating apparatus and a coating method in which tablets are less likely to be caught and retained on a spray gun in a sugar coating treatment.

The pan coating device of the present invention is provided rotatably around a rotation axis, and has a rotating drum in which an object to be coated to be coated is housed, and a rotating drum arranged in the rotating drum. A pan-coating device comprising a spray gun for spraying a coating liquid onto a layer to be treated formed by rolling of the object to be processed with the rotation of the spray gun, wherein the spray gun has a cross section of the rotating drum. It is characterized by being able to move to the retracted position set in the area on the opposite side of the area where the main part of the object layer to be formed is formed, out of the area created when the area is divided into two equal parts in the vertical direction. do.

In the present invention, the main part of the object layer to be treated is formed in the region formed when the cross section of the rotary drum is divided into two equal parts in the vertical direction in the spray gun used in the pan coating device. By making it possible to move to the retracted position set in the area opposite to the area, the surface of the object to be treated becomes sticky during the coating process, and the object to be processed is lifted to the upper part of the drum as the rotating drum rotates. However, the object to be treated is less likely to fall on the spray gun. This makes it possible to prevent the object to be treated from being placed on the spray gun and staying there during the coating process.

In the pan coating device, the retracted position is divided by a center line Mv that divides the cross section of the rotating drum into two equal parts in the vertical direction and a center line Mh that divides the cross section of the rotating drum into two equal parts in the horizontal direction. Of the four divided quadrants, the first quadrant may be set. Further, the spray gun may be moved up and down in a direction tilted by, for example, 45 ° from a vertical direction to a horizontal direction. In this case, the spray gun may be made to move in a direction substantially perpendicular to the upper surface of the object layer to be treated. Further, the spray gun may be attached to a gun holder that can be taken in and out of the rotating drum, and the gun holder may be formed in a crank shape having a bent portion. In addition, the coating liquid may be a sugar-coated coating liquid.

On the other hand, in the coating method of the present invention, a rotary drum which is rotatably provided around a rotation axis and contains an object to be coated to be coated, and a rotary drum which is arranged in the rotary drum and rotates. The object to be treated in the rotating drum is coated by a pan coating apparatus having a spray gun that sprays a coating liquid onto the layer of the object to be processed formed by rolling of the object to be processed with the rotation of the drum. This is a coating method for spraying the coating liquid onto the object to be processed while rotating the rotating drum without supplying and exhausting the rotating drum, and supplying and exhausting the rotating drum. A pose 1 step of rotating the rotary drum without performing the process and a dry step of rotating the rotary drum while supplying and exhausting the rotary drum are performed, and the spray gun is used in the pose 1 step and the dry step. , Move to the retracted position set in the area opposite to the area where the main part of the object layer to be processed is formed, out of the area created when the cross section of the rotating drum is divided into two in the vertical direction. It is characterized by letting it.

In the present invention, among the regions formed when the cross section of the rotary drum is divided into two equal parts in the vertical direction in the pause 1 step and the dry step of the coating process performed by the pan coating apparatus. By moving to the retracted position set in the area opposite to the area where the main part of the object layer is formed, the surface of the object to be processed becomes sticky during the coating process, and it accompanies the rotation of the rotating drum. Even if the object to be processed is lifted to the upper part of the drum, the object to be processed is less likely to fall on the spray gun. This makes it possible to prevent the object to be treated from being placed on the spray gun and staying there during the coating process.

In the coating method, the retracted position is divided into a center line Mv that divides the cross section of the rotating drum into two equal parts in the vertical direction and a center line Mh that divides the cross section of the rotating drum into two equal parts in the horizontal direction. Of the four quadrants to be set, the first quadrant may be set. Further, the spray gun may be moved up and down in a direction tilted by, for example, 45 ° from a vertical direction to a horizontal direction. In this case, the spray gun may be made to move in a direction substantially perpendicular to the upper surface of the object layer to be treated. Further, the coating liquid may be a sugar-coated coating liquid.

According to the pan coating apparatus of the present invention, the main part of the object layer to be treated is the region formed when the cross section of the rotary drum is divided into two equal parts in the vertical direction in the spray gun used in the pan coating apparatus. Since it is possible to move to the retracted position set in the area opposite to the area to be formed, the surface of the object to be treated becomes adhesive during the coating process, and the object to be processed reaches the upper part of the drum as the rotating drum rotates. Even if it is lifted, it is difficult for the object to be treated to fall onto the spray gun. As a result, it is possible to prevent the object to be treated from being placed on the spray gun and staying there during the coating process, suppressing the occurrence of defects, and improving the coating quality.

Further, according to the coating method of the present invention, the spray gun can be formed when the cross section of the rotary drum is divided into two equal parts in the vertical direction in the pause 1 step and the dry step of the coating process performed by the pan coating apparatus. By moving the region to the retracted position set in the region opposite to the region where the main part of the object layer to be formed is formed, the surface of the object to be treated becomes sticky during the coating process, and the rotating drum Even if the object to be processed is lifted to the upper part of the drum as it rotates, the object to be processed is less likely to fall onto the spray gun. As a result, it is possible to prevent the object to be treated from being placed on the spray gun and staying there during the coating process, suppressing the occurrence of defects, and improving the coating quality.

It is a side view of the pan coating apparatus which is Embodiment 1 of this invention. It is a front view of the pan coating apparatus of FIG. It is explanatory drawing which shows the structure of the spray gun elevating mechanism. It is explanatory drawing which shows the moving position of a spray gun. It is a side view of the pan coating apparatus which is Embodiment 2 of this invention.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described. 1 and 2 are explanatory views showing the overall configuration of the pan coating device 1 (hereinafter, abbreviated as coating device 1) according to the first embodiment of the present invention, FIG. 1 is a side view thereof, and FIG. 2 is a front view thereof. It is a figure. The coating device 1 of FIGS. 1 and 2 has a jacketless type configuration using a so-called full punching type rotary drum (coating pan, hereinafter abbreviated as drum) 2. A tablet (object to be treated) 3 to be coated is housed in the drum 2, and the coating treatment of the tablet 3 is performed by spraying the coating liquid therein.

As shown in FIG. 1, the coating device 1 has a configuration in which a drum 2 is rotatably installed in a central portion of a housing 4. The drum 2 rotates about a substantially horizontal rotation axis O, and the tablet 3 is charged inside the drum 2. The drum 2 includes a cylindrical body portion 5 and a truncated cone-shaped conical portion 6 formed at both ends of the body portion 5. The body portion 5 is formed of a stainless steel perforated plate (punching plate), and the outer periphery of the body portion 5 is configured to be ventilated by a large number of ventilation holes 7. The conical portion 6 is made of a stainless steel plate having no holes, and a front opening 8 is formed at one end of the conical portion 6 (left side in FIG. 1: one end side of the drum 2). The end of the other conical portion 6 (right side in FIG. 1: the other end of the drum 2) is closed by the end plate 9, and the rotating shaft 11 is attached.

On the right side of FIG. 1 of the drum 2, a drum rotation mechanism (not shown) using an electric drum drive motor is arranged. As described above, the rotating shaft 11 is fixed to the right end side (the other end side) of the drum 2, and a sprocket (not shown) is attached to the rotating shaft 11. The sprocket is connected to the sprocket on the motor side installed in the housing 4 via a chain. When the motor is rotated, the drum 2 is driven in a chain along with the rotation, and rotates around the rotation axis O. The left end side of the drum 2 in FIG. 1 is supported by a roller (not shown).

The front surface of the housing 4 (on the left side in FIG. 1) has a three-divided structure. A chamber door 12 is provided in the center of the front surface of the housing, and unit covers 13a and 13b are provided on both sides thereof. The chamber door 12 is a rectangular parallelepiped box-shaped member, is rotatably supported by one of the unit covers 13a, and is provided to be openable and closable with respect to the housing 4. The unit covers 13a and 13b are also provided so as to be openable and closable with respect to the housing 4. The chamber door 12 has a box shape in which the surface of the housing 4 on the front wall 4a side is open, and the air supply chamber 14 is formed inside. The air supply chamber 14 is arranged in front of the front opening 8 of the drum 2. An inspection door 15 having a monitoring window in the center is attached to the front of the chamber door 12. A product discharge port 16 for taking out the product after the processing is completed is attached to the lower part of the chamber door 12.

An air supply hole 17 is provided on the upper side of the housing front wall 4a. The coating device 1 employs an internal air supply structure, and the air supply hole 17 communicates with the air supply port 19 provided on the upper surface 4b of the housing via the air supply duct 18 arranged in the housing 4. ing. An external air supply duct (not shown) is connected to the air supply port 19. In the coating device 1, when the chamber door 12 is closed, the front opening 8 of the drum 2 faces and communicates with the air supply chamber 14. The air supplied to the air supply port 19 flows into the air supply chamber 14 through the air supply duct 18, and is supplied into the drum 2 from there through the front opening 8.

The upper surface 4b of the housing is also provided with an exhaust port 21 for discharging the air supplied to the drum 2. An external air supply duct (not shown) is connected to the exhaust port 21. As shown in FIG. 2, an internal exhaust duct 22 is installed in the housing 4 so that one end side is in sliding contact with the body portion 5 of the drum 2 and the other end side is directed to the exhaust port 21. The air supplied from the chamber door 12 passes through the drum 2, passes through the internal exhaust duct 22, passes through the exhaust port 21, and is discharged to the outside of the device.

Further, a spray gun 23 for spraying the coating liquid is arranged in the drum 2. The spray gun 23 is attached to the gun holder 24, is inserted into the drum through the front opening 8 of the drum 2, and is provided so as to be freely moved in and out of the drum from the front side of the device. A coating liquid or spray air is supplied to the spray gun 23 via a hose (not shown) housed in the gun holder 24. The spray gun 23 moves in the vertical direction in the drum 2, and a coating liquid or the like is appropriately sprayed from a predetermined spray position on the tablet 3 in the drum 2 at a desired timing, and a coating process is performed.

The spray gun 23 is arranged so as to be vertically movable in an oblique direction (a direction substantially perpendicular to the tablet flow surface) tilted 45 ° horizontally from the vertical direction, and the position of the spray gun 23 in the drum is appropriately changed. It is designed to be used. The gun holder 24 to which the spray gun 23 is attached is supported by the holder arm 25, and is operated in the vertical direction by the spray gun elevating mechanism 26 housed in the unit cover 13b. FIG. 3 is an explanatory diagram showing the configuration of the spray gun elevating mechanism 26.

As shown in FIG. 3, the upper end of the holder arm 25 is connected to the jack cylinder 28 by the bracket 27. The jack cylinder 28 is driven by a motor 29, and when the motor 29 is operated, the rod 31 of the jack cylinder 28 expands and contracts, and the holder arm 25 is operated in the direction X indicated by the arrow. As the holder arm 25 moves in the vertical direction, the spray gun 23 moves in the vertical direction in the drum 2. In this case, the ascending / descending speed of the spray gun 23 is preferably set to a speed of 400 mm / min or more.

FIG. 4 is an explanatory view showing the moving position of the spray gun 23, and shows a cross section along the line AA in FIG. As shown in FIG. 4, in the coating device 1, the spray gun 23 moves / stops between the upper limit position U and the lower limit position L set in the drum 2 by appropriately controlling the rotation angle of the motor 29. It is free. The spray gun 23 moves up and down along a direction substantially perpendicular to the upper surface 32a of the tablet layer 32 formed by the tablet 3 that rolls when the drum rotates. The movement upper limit position U of the spray gun 23 is arranged outside the center (rotation axis) O with respect to the tablet layer 32.

In this case, assuming the regions A and B formed when the cross section of the drum 2 is divided into two equal parts by the vertical center line Mv as shown in FIG. 4, the spray gun 23 is half of the tablet layer 32. It is set above the region B on the opposite side of the main portion 32b where the above is present. That is, in FIG. 4, of the four quadrants divided by the center line Mv and the horizontal center line Mh of the drum 2, the tablet layer 32 is mainly formed in the third quadrant (3), and the upper limit position U. Is arranged in the first quadrant (1) at a position point-symmetrical to the center O with respect to the tablet layer 32.

In the coating apparatus 1, the spray gun 23 is moved with the upper limit position U as the retracted position during the “pause” step (here, the “pause 1” step described later) or the “dry” step during the coating process. As a result, even if the tablet surface becomes sticky during sugar coating and the tablet 3 is lifted to the upper part of the drum as the drum 2 rotates, the tablet 3 is placed on the spray gun 23 as in the tablet 3p of FIG. It falls without falling. Therefore, it is possible to prevent the tablet 3 from being caught on the spray gun and staying there during the coating process, suppressing the occurrence of defects, and improving the coating quality.

Next, the coating process using the coating device 1 as described above will be described by taking the production of sugar-coated tablets as an example. Here, first, as the tablet 3 to be coated, a tablet such as a lactose tablet (for example, diameter 8 mm, 200 mg / T) is put into the drum 2. In the coating device 1, the tablet 3 is charged from the front opening 8 with the chamber door 12 open. When the tablet is loaded, the spray gun 23 is in a state of being retracted to the outside of the drum 2. After charging a predetermined amount of the tablet 3, the spray gun 23 is set in the drum 2. After that, the chamber door 12 is closed, the drum drive motor is operated, and the drum 2 is rotated.

The coating liquid (sugar coating liquid) is sprayed from the spray gun 23 on the tablet 3 in the drum while rotating the drum 2. The coating liquid contains a coating substance, a binder, a solvent and the like, and is sprayed from the spray gun 23 at a predetermined pressure. In the sugar coating process, the process of "pose 0"->"spray"->"pose1"->"dry" (→ return to "pose 0") is usually repeated for about 20 to 50 cycles, and is gradually applied to the tablet 3. Form a sugar-coated layer. After the "pause 1" step, a "pause 2" step is provided in which the drum 2 is rotated while only exhausting, and the humidity in the drum is lowered before the drying step, depending on the coating liquid and other conditions. Is also good.

In this case, "pause 0" is a preparation period for entering the next processing cycle after the start of the coating treatment or the end of one cycle, and the drum 2 is rotated without supplying air or spraying the coating liquid (1 to 1). About 2 minutes). "Spray" is a step of spraying the coating liquid (for example, about 1 to 2 minutes) while rotating the drum 2 without supplying and exhausting air (for example, about 8 rpm). Further, "pause 1" is a kneading process in which the drum 2 is rotated without supplying air or spraying the coating liquid, and the coating liquid is spread on the tablets (about 2 to 4 minutes). “Dry” is a step of supplying warm air to the drum 2 (for example, 70 ° C., 12 m ³ / min) without spraying the coating liquid to dry and solidify the coating liquid on the tablets (4 to 6). About minutes).

In such a sugar coating step, in the coating device 1, the spray gun 23 moves to the upper limit position U and retracts during the “pause 1” step and the “dry” step. This prevents the tablet 3 from falling onto the spray gun 23 and staying in the "pause 1" step or the "dry" step. Even when the above-mentioned "pause 2" process is performed, the spray gun 23 is arranged at the upper limit position U during the "pause 2" process. Further, in the "spray" step, the position of the spray gun 23 is automatically changed according to the progress of the number of cycles of the sugar coating. That is, in the spraying step, as the thickness of the tablet layer 32 increases, the spray position of the spray gun 23 is controlled so as to have an optimum spray distance, and the spray gun 23 automatically moves (rises) from the lower limit position L. .. By such a gun operation, the spray gun 23 is appropriately moved between the upper limit position U and the lower limit position L during the coating process, and is moved and stationary to an appropriate position only during the spraying process.

On the other hand, in the case of "spraying", the spray gun 23 needs to be moved to an appropriate position and allowed to stand still before the treatment is started. Therefore, in the "pause 0" step, the spray gun 23 located at the upper limit position U in the "dry" step is lowered and moved to a predetermined spray position. In this case, the ascending / descending speed of the spray gun 23 is set to a speed of 400 mm / min or more so that the desired movement is possible, but the time of the "pause 0" process is very short, and during the "pause 0" process. It is also assumed that the spray gun 23 cannot be moved from the upper limit position U to the spray position.

Therefore, in such a case, the spray gun 23 is lowered from the "dry" step before the "pause 0" step to prepare for the "spray" step. Further, if the "dry" process is also very short, the movement is started from the "pause 1" process, the spray gun 23 is lowered while performing the "dry", and after the "pause 0" process is completed, the "spray" is performed. Before the start of the process, the spray gun 23 may be allowed to stand still in an appropriate position. In this way, when the "pause 0" or "dry" time is extremely short, the spray gun 23 is moved from the previous step to ensure that the spray gun 23 is placed in the proper position at the start of the "spray" step. The operation of the spray gun 23 is controlled so as to be performed.

(Embodiment 2)
Next, the pan coating apparatus according to the second embodiment of the present invention will be described. FIG. 5 is an explanatory diagram showing the configuration of a spray gun used in the pan coating device 41 of the second embodiment (hereinafter, abbreviated as the coating device 41). In the present embodiment, the same parts and members as those of the coating device 1 of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 5, in the coating device 41, the gun holder 42 to which the spray gun 23 is attached is bent like a crank. Here, the gun holder 42 is bent from the first horizontal portion 43a extending horizontally from the front opening 8 side, bending at a right angle from the first horizontal portion 43a to the first bending portion 44a, and extending upward from the ascending portion 45 and the ascending portion 45. The crank structure is composed of a second horizontal portion 43b that bends at a right angle at the second bent portion 44b and extends horizontally to the inner portion side of the drum 2. The spray gun 23 is attached to the second horizontal portion 43b on the inner side.

As described above, before and after the coating process, the spray gun 23 is retracted from the drum 2, but at that time, the gun holder 42 or the spray gun 23 and the periphery of the front opening 8 (mouse ring portion) interfere with each other. There is a risk of Further, since the gun holder 42 cannot move up and down beyond the caliber of the front opening 8, the upper limit position U of the spray gun 23 is also limited thereto. Therefore, in the coating device 41, the upper limit position U is set higher while preventing the gun holder 42 and the like from interfering with the mouse ring portion when the spray gun is retracted by forming the gun holder 42 into a bent shape. For example, the upper limit position U of the spray gun 23 can be set to the outer diameter side of 1/2 of the radius R of the drum 2. This makes it possible to avoid interference between the members and to retract the spray gun upward at the same time.

It goes without saying that the present invention is not limited to the above-described embodiment and can be variously modified without departing from the gist thereof.
For example, in the above-described embodiment, the upper limit position U is set as the retracted position of the spray gun 23, but the position for retracting the spray gun 23 does not necessarily have to be the upper limit position U, and the upper limit position is long as the tablet 3 does not fall. A position lower than U may be used as the evacuation position. Further, the above-mentioned various numerical values are merely examples, and the present invention is not limited thereto, and each numerical value can be appropriately changed. Further, the number of spray guns 23 installed is not limited to the three shown in the figure.

On the other hand, in the above-described embodiment, the spray gun 23 is arranged with reference to the center position in the depth direction of the drum 2, but the installation position of the spray gun 23 is not limited to the center portion of the drum, for example, the front opening 8. It is also possible to use a form that sprays from a position close to the back of the drum. Further, in the second embodiment, the crank-shaped gun holder 42 is moved in the vertical direction to retract the spray gun 23, but the spray gun 23 is retracted upward by rotating the gun holder 42 and turning it upside down. It may be configured. Further, as the sugar coating liquid, in addition to the syrup in which sugar is dissolved in water, sugar coating liquids having various specifications such as those to which various medicinal ingredients, flavors, pigments and the like are added can be used.

The present invention can be applied not only to tablets such as medicines and health foods, but also to coating treatments for confectionery such as gum and chocolate and other foods.

1 Pan coating device 2 Rotating drum 3 Tablets (object to be treated)
3p Tablet 4 Housing 4a Front wall 4b Top surface 5 Body 6 Conical part 7 Ventilation hole 8 Front opening 9 End plate 11 Rotating shaft 12 Chamber door 13a Unit cover 13b Unit cover 14 Air supply chamber 15 Inspection door 16 Product outlet 17 Air supply hole 18 Air supply duct 19 Air supply port 21 Exhaust port 22 Internal exhaust duct 23 Spray gun 24 Gun holder 25 Holder arm 26 Spray gun elevating mechanism 27 Bracket 28 Jack cylinder 29 Motor 31 Rod 32 Tablet layer (material layer to be processed)
32a Top 32b Main part 41 Pan coating device 42 Gun holder 43a First horizontal part 43b Second horizontal part 44a First bent part 44b Second bent part 45 Ascending part A Area B Area U Upper limit position (retracted position in this embodiment)
L Lower limit position Mv Vertical center line Mh Horizontal center line O Rotation axis R Rotation drum radius

Claims (10)

A rotating drum that is rotatably provided around the axis of rotation and contains an object to be coated to be coated.
A pan coating apparatus comprising a spray gun arranged in the rotary drum and spraying a coating liquid onto a layer of the object to be treated formed by rolling of the object to be processed accompanying the rotation of the rotary drum.
The spray gun was set in a region opposite to the region where the main portion of the object layer to be processed is formed, in the region formed when the cross section of the rotary drum is divided into two equal parts in the vertical direction. Pan coating device characterized by being movable to the retracted position In the pan coating apparatus according to claim 1,
The retracted position has four quadrants divided by a center line Mv that divides the cross section of the rotating drum into two equal parts in the vertical direction and a center line Mh that divides the cross section of the rotating drum into two equal parts in the horizontal direction. Of these, a pan coating device characterized in that it is set in the first quadrant. In the pan coating apparatus according to claim 1 or 2.
The spray gun is a pan coating device that moves up and down in a direction inclined from a vertical direction to a horizontal direction. In the pan coating apparatus according to any one of claims 1 to 3.
The spray gun is attached to a gun holder that can be taken in and out of the rotating drum.
The gun holder is a pan coating device characterized in that it is formed in a crank shape having a bent portion. In the pan coating apparatus according to any one of claims 1 to 4.
A bread coating apparatus, wherein the coating liquid is a sugar-coated coating liquid. A rotary drum that is rotatably provided around a rotation axis and houses an object to be coated to be coated, and an object to be processed that is arranged in the rotary drum and accompanies the rotation of the rotary drum. A coating method for coating an object to be processed in the rotating drum with a pan coating device having a spray gun for spraying a coating liquid onto the object layer to be processed formed by rolling.
A spraying step of spraying the coating liquid on the object to be processed while rotating the rotating drum without supplying and exhausting the rotating drum.
A pause 1 step of rotating the rotating drum without supplying and exhausting the rotating drum,
A dry process of rotating the rotary drum while supplying and exhausting the rotary drum is performed.
Of the regions formed when the spray gun is divided into two equal parts in the vertical direction in the pose 1 step and the dry step, the region where the main portion of the object layer to be processed is formed. A coating method characterized by moving to a retracted position set in the area opposite to. In the coating method according to claim 6,
The retracted position has four quadrants divided by a center line Mv that divides the cross section of the rotating drum into two equal parts in the vertical direction and a center line Mh that divides the cross section of the rotating drum into two equal parts in the horizontal direction. Of these, a coating method characterized in that it is set in the first quadrant. In the coating method according to claim 6 or 7.
Prior to the spraying step, a pause 0 step of rotating the rotating drum without supplying and exhausting the rotating drum is provided.
A plurality of cycles including the pose step, the spray step, the pose 1 step, and the dry step are carried out.
A coating method comprising moving the spray gun from the retracted position to the spray position where the spraying step is performed in the pose 0 step. In the coating method according to any one of claims 6 to 8,
The coating method is characterized in that the spray gun moves up and down in a direction inclined from a vertical direction to a horizontal direction. In the coating method according to any one of claims 6 to 9,
A coating method characterized in that the coating liquid is a sugar-coated coating liquid.

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