JP2981249B2 - Granulation coating apparatus and granulation coating method using the same - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a granulation coating technique, and more particularly to a technique for performing a granulation coating using a rotating drum.

[Prior Art] As one of the granulation coating techniques, for example, a rotating drum rotating in a vertical plane is used, and an object to be coated is accommodated in the rotating drum, and the rotating drum is rotated to form granules. Coating technology has been proposed.

In such a granulation coating technique, a spray gun or an inner duct is axially charged into the rotating drum to supply a coating liquid or air for drying into the rotating drum.

[Problems to be solved by the invention]

However, the position of a normal spray gun or inner duct is fixed.

Therefore, the spray gun or the inner duct is always charged in the rotating drum.

Therefore, in the kneading process after the spraying process, tablets to be coated adhere to the spray gun or the inner duct, and the adhered materials peel off later to prevent contamination of the coated product in the rotating drum. The present inventors have found that there are problems such as the occurrence of a product defect.

Accordingly, one object of the present invention is to provide a technique capable of preventing occurrence of a defect due to contamination of a product to be coated.

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

[Means for solving the problem]

The outline of a representative invention among the inventions disclosed in the present application will be briefly described as follows.

That is, in order to achieve the above object, the granulation coating technique of the present invention comprises a rotating drum for accommodating an object to be coated, a spray unit for supplying a coating liquid into the rotating drum, and a gas supply to the rotating drum. A granulating coating apparatus comprising: an inner duct; and an advancing / retreating means for entering or retracting the interduct into or out of the rotary drum.

Further, in the granulation coating apparatus of the present invention, a spray means is incorporated in the inner duct, and the spray means is moved into or out of the rotary drum together with the inner duct or retracted.

Furthermore, the granulation coating apparatus of the present invention is provided with a support means incorporating a spray means, and the support means is moved into or out of the rotary drum together with the spray means or retracted.

Further, the granulation coating method of the present invention uses the above-described granulation coating apparatus. During the spraying step, the inner duct, the spraying means or the supporting means is made to enter the inside of the rotary drum, and kneaded. During the process, the inner duct, the spraying means or the supporting means is retracted to the outside of the rotating drum.

[Action]

According to the granulation coating apparatus of the present invention and the granulation coating method using the same, the inner duct or the support means or the spray gun means enters the inside of the rotary drum in the spraying step or the drying step, while kneading. In the process and the like, the rotary drum is retracted to the outside of the rotary drum, so that a coating object, for example, a tablet can be prevented from adhering to the inner duct, the support means, and the like, and occurrence of a defect due to contamination of the coating target product can be prevented.

[Example 1] Fig. 1 is a schematic sectional view showing an inner duct entering state of a granulating coating apparatus according to an embodiment of the present invention, and Fig. 2 is a schematic sectional view showing the inner duct retracting state.

The granulating coating apparatus of the present embodiment has a rotating drum 1 for storing a coating object, for example, a tablet therein. The rotary drum 1 is rotatable in a vertical plane around a horizontal axis by a rotary drive source (not shown) such as a motor.

On one side of the rotary drum 1, for example, on the right side (rear side) in FIGS. 1 and 2, an air supply duct 2 for supplying drying air or the like is fixed in position so as not to rotate with the rotary drum 1. It is installed continuously.

The distal end side of the air supply duct 2 is nested as an inner duct 3, and the inner duct 3 is provided with an air supply hole (not shown).

The inner duct 3 can move relative to the air supply duct 2 linearly in the axial direction in a sealed state. Therefore, an air cylinder 4 as a means for moving the inner duct 3 forward and backward is provided in a part of the air supply duct 2, and the distal end side of the piston rod 5 of the air cylinder 4 is connected to the inner surface of the distal end of the inner duct 3. Have been.

Therefore, as the piston rod 5 of the air cylinder 4 projects or retracts, the inner duct 3 can enter or retract between the inside and the outside of the rotary drum 1.

The air cylinder 4 can be disposed outside the air supply duct 2 as shown by a two-dot chain line in FIGS. 1 and 2 in order to avoid problems such as fluctuations in operating characteristics due to air supply.

Although not shown, a porous portion for discharging air supply and an exhaust duct can be disposed around the rotary drum 1 at predetermined intervals in the circumferential direction.

Further, a spray means for supplying the coating liquid can be provided inside the rotary drum 1, but illustration of the spray means is omitted in this embodiment.

Next, the granulation coating operation in this embodiment will be described.

First, in a step of spraying a coating liquid from a spray means (not shown), as shown in FIG. 1, the piston rod 5 of the air cylinder 4 is set in a protruding state, and the interduct 3 is caused to enter the inside of the rotary drum 1 from the axial direction. State.

In this state, in the spraying step, the coating liquid is supplied into the rotating drum 1 by spraying means (not shown) while rotating the rotating drum 1 around a horizontal axis in a vertical plane by a motor (not shown) or the like. I do.

In the drying step, the rotating drum 1 is driven to rotate while the heated air or the like is supplied from the air supply duct 2 to the rotating drum 1 via the inner duct 3 to dry the object to be coated. In the drying step, the inner duct 3 may be in a state of entering the rotary drum 1 or may be in a retreating state. When the inner duct 3 is in the retreating state, adhesion of the object to be coated can be prevented.

On the other hand, in the kneading process of the coated object,
In order to prevent the object to be coated from adhering to the outer peripheral surface of the inner duct 3, the piston rod 5 of the air cylinder 4 is immersed, that is, retracted, so that the inner duct 3
To the outside of the rotating drum 1.

Therefore, in the present embodiment, even in the kneading step, it is possible to eliminate a problem that a substance to be coated, such as a tablet, adheres to the periphery of the inner duct 3 and subsequently peels off and mixes with the product to become a contamination source.

Embodiment 2 FIG. 3 is a schematic sectional view of an inner duct according to another embodiment of the present invention.

In this embodiment, a structure in which a spray gun 6 as a spray means is incorporated in a part of the space of the inner duct 3 and a hose (not shown) for supplying drying air or a coating liquid is also incorporated in the inner duct 3. It has become.

In this embodiment, the spray gun 6 is configured to be easily detachable from the mouth ring side.

1 and 2, the inner duct 3 of this embodiment can be moved in and out of the rotary drum 1 by an advancing / retreating means such as an air cylinder 4 as required.

Therefore, in this embodiment, the spray gun 6
By incorporating the inner duct 3 into the inner duct 3, the structure is simplified as compared with the case where the spray gun 6 is configured as a separate body from the inner duct 3, and the inner duct 3 is formed in a similar manner to the spraying step or the kneading step. By entering or retracting the inside or outside of the rotary drum 1 as desired, the object to be coated adheres to the inner duct 3 or the spray gun 6, and then can be prevented from being contaminated by being separated and mixed into the product.

In the present embodiment, when the inner duct 3 is in the entering state during the drying step, the heated state of the coating liquid can be maintained in the spray gun 6, and when the inner duct 3 is in the retracted state, the adhesion of the object to be coated can be prevented.

[Embodiment 3] Fig. 4 is a schematic sectional view of a granulation coating apparatus according to still another embodiment of the present invention, Fig. 5 is a schematic sectional view showing a spray gun support entering state, and Fig. 6 is a spray gun. It is a schematic sectional drawing which shows a support retreat state.

In this embodiment, the spray gun 6 as a spray means is incorporated in a spray gun support 7 (support means) separate from the inner duct 3. A hose (not shown) for supplying a coating liquid or the like is also stored in the spray gun support 7.

The spray gun support 7 of the present embodiment is
As shown in FIG. 6 and FIG. 6, the piston rod 9 of the air cylinder 8 (advancing / retracting means) is configured to enter or exit the rotary drum 1 by projecting or retracting.

Needless to say, the inner duct 3 of this embodiment can also be configured to enter or retreat from the inside or outside of the rotary drum 1 similarly to the embodiment of FIGS. 1 and 2.

Also in the present embodiment, the spray gun support 7 is advanced into the rotary drum 1 in the spraying process, while the spray gun support 7 is retracted to the outside of the rotary drum 1 in the kneading process. 6 can be prevented from being caused by the adhesion of the object to be coated.

Also in this embodiment, during the drying process, the spray gun support 7 may be at the entering position or at the retracted position. When in the approach position, the spray gun 6
While the heated state of the coating liquid inside can be maintained, when the coating liquid is at the retracted position, the adhesion of the object to be coated can be prevented.

As described above, the invention made by the inventor has been specifically described based on the embodiment. However, the present invention is not limited to the embodiment, and it can be said that various modifications can be made without departing from the gist of the invention. Not even.

For example, the shape of the rotating drum, the ventilation structure thereof, the structure of the spray gun, and the like are not limited to the above-described embodiment.

In addition to the air cylinder, other types of the reciprocating means can be used.

In the above description, the case where the invention made by the present inventor is mainly applied to the tablet coating which is the field of application has been described.However, the present invention is not limited to this case. Also applicable to granulation coating.

〔The invention's effect〕

The effects obtained by typical aspects of the invention disclosed in the present application will be briefly described as follows.

(1). A granulation coating apparatus comprising: a rotating drum that stores an object to be coated; a spray unit that supplies a coating liquid into the rotating drum; and an inner duct that supplies a gas into the rotating drum. By providing the reciprocating means for entering or retracting the duct inside or outside the rotary drum, it is possible to prevent the object to be coated from adhering to the inner duct and to eliminate the occurrence of defective products to be coated due to contamination caused thereby. .

(2). Incorporating spray means into the inner duct and moving the spray means together with the inner duct into or out of the rotary drum, in addition to the above-mentioned effect (1), an object to be coated on a spray gun And the structure of the spray gun and the inner duct can be simplified.

(3). By providing support means incorporating a spray means and moving the support means into or out of the rotary drum, adhesion of an object to be coated on the support means and the spray means and occurrence of a defect due to contamination caused thereby. Can be prevented.

(4). According to the granulation coating method of the present invention, the inner duct, the spraying means or the supporting means is made to enter the inside of the rotary drum, and the kneading step is to connect the inner duct, the spraying means or the supporting means to the outside of the rotating drum. In this way, it is possible to prevent the coating object from adhering to the inner duct and the like in the kneading process and to prevent the occurrence of defects due to the adhesion.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an inner duct entering state of a granulating coating apparatus according to one embodiment of the present invention, FIG. 2 is a schematic sectional view showing the inner duct retracting state, and FIG. FIG. 4 is a schematic sectional view of a granulating coating apparatus according to still another embodiment of the present invention, FIG. 5 is a schematic sectional view showing a spray gun support entering state thereof, FIG. FIG. 6 is a schematic sectional view showing the spray gun support retracted state. DESCRIPTION OF SYMBOLS 1 ... Rotating drum, 2 ... Air supply duct, 3 ... Inner duct, 4 ... Air cylinder (retraction means), 5 ... Piston rod, 6 ... Spray gun, 7 ... Spray gun support (Support means) ), 8 ... air cylinder (advancing / retracting means), 9 ... piston rod.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B01J 2/00-2/30

Claims (4)

(57) [Claims] 1. A granulation coating apparatus comprising: a rotating drum for accommodating an object to be coated; a spray means for supplying a coating liquid into the rotating drum; and an inner duct for supplying a gas to the rotating drum. A granulating coating apparatus, further comprising a retreating means for moving the interduct into or out of the rotary drum or retreating the same. 2. The granulation coating apparatus according to claim 1, wherein said spray means is incorporated in said inner duct, and said spray means is moved in or out of said rotary drum together with said inner duct. . 3. A granulating coating apparatus according to claim 1, further comprising a support means incorporating said spray means, wherein said support means enters or retracts inside or outside said rotary drum. 4. A granulating coating method using the granulating coating apparatus according to claim 1, wherein the inner duct, the spraying means or the supporting means is provided inside the rotating drum during a spraying step. Wherein the inner duct, the spraying means or the supporting means is retracted to the outside of the rotary drum during the kneading step.