JP7703841B2 - Coating method and coating device - Google Patents

Description

The present invention relates to a coating method and a coating device.

In the manufacturing process of absorbent articles such as disposable diapers, incontinence pads, and sanitary products, hot melt adhesive is intermittently applied to a substrate such as a sheet material that is transported in a fixed direction (for example, Patent Document 1).

JP 2011-131162 A

Hot melt adhesive is applied to the workpiece from an application gun in a melted state by heating the solid raw material. The hot melt adhesive is applied with the nozzle of the application gun in contact with the workpiece. Because hot melt adhesive has a high viscosity even in a molten state, there is a risk that any hot melt adhesive that does not end up on the sheet material will accumulate downstream in the conveying direction of the application gun's nozzle. When hot melt adhesive is applied intermittently, if hot melt adhesive accumulates downstream in the conveying direction of the nozzle, the application gun will drag the accumulated hot melt adhesive, causing a tailing, and hot melt adhesive will be applied to areas that are not designed to be coated with hot melt adhesive.

The present invention aims to provide a technology that can prevent hot melt adhesive from being applied to areas that are not intended for application.

In order to solve the above problem, the present invention filters out the hot melt adhesive that has accumulated downstream of the discharge port when switching the hot melt adhesive from a coating state to a non-coating state.

In detail, the present invention is a coating method for intermittently coating a hot melt adhesive from a coating gun onto a workpiece being transported in a fixed direction, the coating gun having a discharge port for discharging the hot melt adhesive, and including a first step of contacting the discharge port with the workpiece in a coating state in which the hot melt adhesive is applied to the workpiece, and a second step of applying pressure from below to the workpiece to filter out the hot melt adhesive that has accumulated downstream of the discharge port when switching from the coating state to a non-coating state in which the hot melt adhesive is not applied to the workpiece.

In the above coating method, a roller that is movable up and down is disposed below the workpiece and downstream of the discharge port, and rotates in the transport direction of the workpiece in synchronization with the transport speed of the workpiece. In the first step, the roller contacts the workpiece at a predetermined position, and in the second step, the roller contacts the workpiece above the predetermined position to apply pressure to the workpiece and filter out the hot melt adhesive that has accumulated downstream of the discharge port. The coating method may also include a third step in which, after the hot melt adhesive has been filtered out, the roller is lowered to separate the workpiece from the discharge port.

In the above coating method, a roller is disposed below the workpiece and downstream of the discharge port, which rotates in the conveying direction of the workpiece in synchronization with the conveying speed of the workpiece, and the roller has a circumferential portion corresponding to the length of the application range of the hot melt adhesive on the workpiece, an enlarged diameter portion larger in diameter than the circumferential portion, which applies pressure to the workpiece and filters out the hot melt adhesive that has accumulated downstream of the discharge port, and a reduced diameter portion smaller in diameter than the circumferential portion, which is disposed behind the enlarged diameter portion. and a reduced diameter portion arranged to face the coated object, and in the first step, the coated object is brought into contact with the discharge port by aligning the coated object along the circumferential portion, and in the second step, the hot melt adhesive that has accumulated downstream of the discharge port is filtered out by applying pressure to the coated object with the expanded diameter portion, and the coating method may include a third step in which, after filtering out the hot melt adhesive, the reduced diameter portion is directed toward the coated object to separate the coated object from the discharge port.

In the above coating method, in the second step, the hot melt adhesive may be filtered by blowing compressed air onto the workpiece from below.

In the above coating method, the substrate may be a sheet material for absorbent articles, and the hot melt adhesive may contain a material that changes color when it comes into contact with excrement.

The present invention can also be seen from the perspective of an application device. For example, the present invention may be an application device that intermittently applies hot melt adhesive from an application gun to a workpiece transported in a fixed direction, the application gun having an outlet for discharging the hot melt adhesive, the application gun bringing the outlet into contact with the workpiece in a coating state in which the hot melt adhesive is applied to the workpiece, and a filtering means for filtering out the hot melt adhesive that has accumulated downstream of the outlet by applying pressure to the workpiece from below when switching from the coating state to a non-coating state in which the hot melt adhesive is not applied to the workpiece.

The present invention can prevent hot melt adhesive from being applied to areas not designated for application by the design.

FIG. 1 is a schematic diagram showing a coating method according to a comparative example. FIG. 2 is a flowchart showing an outline of the coating method according to the embodiment. FIG. 3 is a schematic diagram showing a coating method according to the first embodiment. FIG. 4 is a schematic diagram showing a coating method according to the second embodiment. FIG. 5 is a schematic diagram showing a coating method according to the third embodiment.

Below, embodiments of the present invention will be described with reference to the drawings. Note that the configurations of the following embodiments are examples, and the present invention is not limited to the configurations of these embodiments.

<Overview of coating method>
The application method according to the present embodiment is a method of intermittently applying a hot melt adhesive from an application gun to a coated object transported in a fixed direction. Examples of the coated object include sheet materials used for absorbent articles such as disposable diapers, urine pads, and sanitary products. In a production line for manufacturing absorbent articles, a hot melt adhesive is applied to a sheet material for absorbent articles transported in a fixed direction. The hot melt adhesive may be applied intermittently to the sheet material so that the hot melt adhesive is applied to a designed application range (hereinafter referred to as the "application range") and is not applied to a designed non-application range (hereinafter referred to as the "non-application range"). The application range and the non-application range are continuous in the transport direction of the sheet material, and the hot melt adhesive is discharged from the application gun when the application range of the sheet material passes under the application gun, and the hot melt adhesive is not discharged from the application gun when the non-application range of the sheet material passes under the application gun. As a result, the hot melt adhesive is intermittently applied to the sheet material transported in a fixed direction.

In addition, in the application method according to this embodiment, the nozzle of the application gun is brought into contact with the sheet material in the application state in which the hot melt adhesive is applied to the sheet material. In contrast, when applying the hot melt adhesive without bringing the nozzle of the application gun into contact with the sheet material, the hot melt adhesive is applied by spraying, and when applying the hot melt adhesive intermittently, the hot melt adhesive cannot be applied cleanly at the end. Therefore, when it is necessary to apply the hot melt adhesive intermittently (when it is necessary to provide a non-adhesive area, or when applying a hot melt adhesive containing a coloring substance to form an indicator), it is preferable to contact the application gun with the sheet material as in the application method according to this embodiment.

In addition, in the application method according to this embodiment, the hot melt adhesive is applied from the application gun to the sheet material in a melted state by heating the solid raw material to approximately 140°C to 160°C. Because hot melt adhesive has a high viscosity even in a molten state, there is a risk that the hot melt adhesive that does not end up on the sheet material will accumulate downstream in the conveying direction from the discharge port of the application gun.

Figure 1 is a schematic diagram showing a coating method according to a comparative example. The upper part of Figure 1 is a schematic diagram of a sheet material S, which is a coated object, viewed from above, and the lower part of Figure 1 is a schematic diagram of the sheet material S viewed from the side. The sheet material S is transported in the direction indicated by the arrow A1 in Figure 1 by a roller R100 rotating in the direction indicated by the arrow A2 in Figure 1. The coating gun G is supplied with raw materials of hot melt adhesive H heated to about 140°C to 160°C by a pump from a supply device (not shown), and the coating gun G can discharge the hot melt adhesive H from a discharge port N provided at the tip. In addition, by switching the pump of the supply device between an operating state and a non-operating state, it is possible to switch between a discharge state in which the hot melt adhesive H is discharged from the discharge port N and a non-discharge state in which the hot melt adhesive H is not discharged from the discharge port N. In addition, in the comparative example, a contact type coating gun G is used in which the discharge port N is constantly in contact with the sheet material.

In this comparative example, the area B shown in FIG. 1 is the design application area of the hot melt adhesive H. When the rear end of the application area B passes through the discharge port N, the hot melt adhesive H is in a non-discharged state. However, tailing occurs in which the application gun G drags the hot melt adhesive H that has accumulated downstream of the discharge port N in the conveying direction, and the hot melt adhesive H is applied to the non-applied area as well. In this way, if the hot melt adhesive H is intermittently applied with the discharge port N of the application gun G constantly in contact with the sheet material, tailing occurs in which the application gun G drags the hot melt adhesive H, and the hot melt adhesive H is applied to the non-applied area as well. In an absorbent article, it is not preferable for the adhesiveness to be exerted in the non-applied area that is desired to be non-adhesive. It is possible to suppress the occurrence of tailing by lowering the viscosity of the hot melt adhesive H by raising the temperature of the hot melt adhesive H above 160°C, but if the hot melt adhesive H is raised above 160°C, there is a risk that the performance will change, which is not preferable.

Therefore, in the application method according to this embodiment, the hot melt adhesive that has accumulated on the downstream side of the discharge port is filtered out at the start of a non-application state in which the hot melt adhesive is not applied to the sheet material S. This prevents the application gun from dragging the hot melt adhesive that has accumulated on the downstream side of the discharge port in the conveyance direction, and prevents the hot melt adhesive from being applied to the designed non-application range.

Figure 2 is a flow chart showing an overview of the coating method according to this embodiment. In the coating method according to this embodiment, first, the hot melt adhesive is applied to the sheet material (step S101, an example of the "first step" in this application). Next, when switching from a coated state of the hot melt adhesive to a non-coated state in which the hot melt adhesive is not applied to the coated object, pressure is applied from below to the sheet material to filter out the hot melt adhesive that has accumulated downstream of the discharge port (step S102, an example of the "second step" in this application). Next, after filtering out the hot melt adhesive, the sheet material is separated from the discharge port (step S103, an example of the "third step" in this application). In the coating method according to this embodiment, steps S101 to S103 are repeatedly performed to intermittently coat the hot melt adhesive on the sheet material being transported in a certain direction. Note that step S103 can be omitted.

Next, the coating method according to this embodiment will be described in more detail with reference to Figs. 3 to 5. In this embodiment, three specific examples, Examples 1 to 3, are illustrated. As shown in Figs. 3 to 5, in this embodiment, the coating gun G has a discharge port N for discharging the hot melt adhesive H. The coating gun G is supplied with the raw material of the hot melt adhesive H heated to about 140°C to 160°C by a pump from a supply device (not shown). Also, as in the above-mentioned comparative example, the hot melt adhesive H can be switched between a discharge state and a non-discharge state by switching the pump of the supply device between an operating state and a non-operating state. Also, in this embodiment, a contact-type coating gun G is used in which the discharge port N is brought into contact with the sheet material S in the discharge state. Also, in each of the examples shown in Figs. 3 to 5, the sheet material is transported in the direction indicated by the arrow A1 in each figure.

Example 1
The coating method according to the first embodiment will be described with reference to Figs. 3(a)-(c). Figs. 3(a)-(c) are schematic diagrams for explaining the coating method according to the present embodiment. The upper part of Figs. 3(a)-(c) is a schematic diagram of the sheet material S viewed from above, and the lower part of Figs. 3(a)-(c) is a schematic diagram of the sheet material S viewed from the side. The coating device used in the coating method according to the present embodiment includes a coating gun G and a roller R10 (an example of the "filtering means" in the present application). The roller R10 is located below the sheet material S, and the center of rotation O is located downstream of the discharge port N, and can move up and down. The roller R10 rotates in the conveying direction of the sheet material S (the direction indicated by the arrow A2) in synchronization with the conveying speed of the sheet material S.

Figure 3 (a) shows the process of applying hot melt adhesive H. In this process, roller R10 is in contact with sheet material S at a predetermined position, and the discharge port N is in contact with sheet material S. Sheet material S is transported downstream in the tangential direction of the circumference of roller R10 while in contact with discharge port N. Note that the predetermined position of roller R10 in this process is the height at which sheet material S is in an appropriate position relative to discharge port N when hot melt adhesive H is applied.

Figure 3 (b) shows the process of filtering out the hot melt adhesive H. In this process, the roller R10 applies pressure to the sheet material S by contacting the sheet material S above a predetermined position, filtering out the hot melt adhesive H that has accumulated downstream of the discharge port N. This allows the hot melt adhesive H that has accumulated downstream of the discharge port N to be filtered out when switching the hot melt adhesive H from a coating state to a non-coating state. This prevents the coating gun G from dragging the hot melt adhesive H in the non-coating state, and prevents the hot melt adhesive H from being coated in the designed non-coating range.

3C shows a process of separating the sheet material S from the discharge port N after filtering out the hot melt adhesive H. In this process, the roller R10 is lowered to separate the sheet material S from the discharge port N. This process prevents the application gun G from dragging the hot melt adhesive H even if the hot melt adhesive H could not be completely filtered out in the previous process, and prevents the hot melt adhesive H from being applied to areas not designated for application.

Example 2
The coating method according to the second embodiment will be described with reference to Figs. 4(a)-(c). Figs. 4(a)-(c) are schematic diagrams for explaining the coating method according to the present embodiment. The upper part of Figs. 4(a)-(c) is a schematic diagram of the sheet material S viewed from above, and the lower part of Figs. 4(a)-(c) is a schematic diagram of the sheet material S viewed from the side. The coating device used in the coating method according to the present embodiment includes a coating gun G and a roller R20 (an example of the "filtering means" in the present application). The roller R20 is located below the sheet material S, and the center of rotation O is located downstream of the discharge port N. The roller 20 rotates in the conveying direction of the sheet material S (the direction indicated by the arrow A2) in synchronization with the conveying speed of the sheet material S.

The roller R20 has a circumferential portion R21 corresponding to the length of the application range of the hot melt adhesive H on the sheet material S, an enlarged diameter portion R22 having a larger diameter than the circumferential portion R21, and a reduced diameter portion R23 having a smaller diameter than the circumferential portion R21. The enlarged diameter portion R22 applies pressure to the sheet material S by contacting the sheet material S, and filters out the hot melt adhesive H accumulated on the downstream side of the discharge port N. The distance between the outer periphery of the enlarged diameter portion R22 and the center of rotation of the roller R20 is set to a length that applies sufficient pressure to the sheet material S. The reduced diameter portion R23 is arranged so as to face the sheet material S side after the enlarged diameter portion R23. The distance between the outer periphery of the reduced diameter portion R23 and the center of rotation of the roller R20 is set to a length that allows the sheet material S to be separated from the nozzle N when the reduced diameter portion R23 faces the sheet material S side.

Figure 4 (a) shows the process of applying hot melt adhesive H. In this process, the sheet material S is aligned along the circumferential portion R21 of the roller R20, so that the discharge port N comes into contact with the sheet material S. The sheet material S is transported downstream in the tangential direction of the circumferential portion R21 while in contact with the discharge port N.

Figure 4 (b) shows the process of filtering out the hot melt adhesive H. In this process, the expanded diameter portion R22 contacts the sheet material S, and the hot melt adhesive H that has accumulated downstream of the discharge port N can be filtered out by applying pressure to the sheet material S with the expanded diameter portion R22. This allows the hot melt adhesive H that has accumulated downstream of the discharge port N to be filtered out when switching the hot melt adhesive H from a coating state to a non-coating state. This prevents the coating gun G from dragging the hot melt adhesive H in the non-coating state, and prevents the hot melt adhesive H from being coated in the designed non-coating range.

Figure 4 (c) shows the process of separating the sheet material S from the discharge port N after filtering out the hot melt adhesive H. In this process, the sheet material S is separated from the discharge port N by directing the reduced diameter portion R23 toward the sheet material S. This process prevents the application gun G from dragging the hot melt adhesive H even if the hot melt adhesive H could not be completely filtered out in the previous process, and prevents the hot melt adhesive H from being applied to areas not designated for application by design.

Example 3
A coating method according to Example 3 will be described with reference to Figures 5(a) to (b). Figures 5(a) to (b) are schematic diagrams for explaining the coating method according to this example. The upper parts of Figures 5(a) to (b) are schematic diagrams of the sheet material S as viewed from above, and the lower parts of Figures 5(a) to (b) are schematic diagrams of the sheet material S as viewed from the side. The coating device used in the coating method according to this example is a coating gun G.
The sheet material S is provided with a blower M (an example of the "filtering means" in the present application). The blower M is disposed below the sheet material S and blows compressed air toward the downstream side of the discharge port N.

Figure 5 (a) shows the process of applying hot melt adhesive H. In this process, the discharge port N is in contact with the sheet material S.

Figure 5 (b) shows the process of filtering out the hot melt adhesive H. In this process, compressed air is blown from the blower M3 onto the sheet material S from below, filtering out the hot melt adhesive H that has accumulated downstream of the discharge port N. This allows the hot melt adhesive H that has accumulated downstream of the discharge port N to be filtered out when switching the hot melt adhesive H from a coating state to a non-coating state. This prevents the coating gun G from dragging the hot melt adhesive H in the non-coating state, and prevents the hot melt adhesive H from being coated in the designed non-coating range.

The application method according to this embodiment can employ any of the above-mentioned Examples 1 to 3. In addition, in this embodiment, the hot melt adhesive H may be blended with an indicator material that changes color when it comes into contact with excrement. In the absorbent article, the portion to which the indicator material is applied functions as an indicator that indicates to the outside the presence or absence of excrement such as urination. The indicator is provided, for example, by applying the hot melt adhesive H blended with the indicator material to the skin-facing side of the back sheet. Note that the indicator material may be a moisture-detecting material or a pH-reactive material. According to the application method according to this embodiment, the hot melt adhesive H blended with this material can be applied to the indicator placement area, and the hot melt adhesive H can be prevented from being applied to the indicator non-placement area, so that the indicator can be placed within the design range. This allows the indicator to be placed within the design range of the absorbent article, so that the indicator can be prevented from becoming an obstacle in the design of the absorbent article.

<Other embodiments>
Although the embodiments of the present invention have been described above, the various embodiments described above can be combined as far as possible.

A1, A2...Arrows G...Applying gun H...Hot melt adhesive M...Air blower N...Nozzle R10, R20, R100...Roller S...Sheet material

Claims (9)

A coating method for intermittently coating a hot melt adhesive from a coating gun onto a substrate being transported in a constant direction, comprising:
The application gun has a discharge port for discharging the hot melt adhesive,
A first step of contacting the discharge port with the workpiece in a coating state in which the hot melt adhesive is applied to the workpiece;
a second step of applying pressure to the workpiece from below and downstream of the application gun when switching from the application state to a non-application state in which the hot melt adhesive is not applied to the workpiece, thereby filtering out the hot melt adhesive that has accumulated between the application gun and the workpiece ;
The coating method comprising: A coating method for intermittently coating a hot melt adhesive from a coating gun onto a substrate being transported in a constant direction, comprising:
The application gun has a discharge port for discharging the hot melt adhesive,
A first step of contacting the discharge port with the workpiece in a coating state in which the hot melt adhesive is applied to the workpiece;
a second step of filtering out the hot melt adhesive accumulated downstream of the discharge port by applying pressure to the workpiece from below when switching from the applied state to a non-applied state in which the hot melt adhesive is not applied to the workpiece;
Including,
a roller that is movable up and down is disposed below the workpiece and downstream of the discharge port, the roller rotating in a conveying direction of the workpiece in synchronization with a conveying speed of the workpiece;
In the first step, the roller is in contact with the workpiece at a predetermined position,
In the second step, the roller contacts the workpiece above the predetermined position to apply pressure to the workpiece, thereby filtering out the hot melt adhesive that has accumulated downstream of the discharge port;
The coating method includes a third step of filtering out the hot melt adhesive and then lowering the roller to separate the workpiece from the discharge port.
Application method. A coating method for intermittently coating a hot melt adhesive from a coating gun onto a substrate being transported in a constant direction, comprising:
The application gun has a discharge port for discharging the hot melt adhesive,
A first step of contacting the discharge port with the workpiece in a coating state in which the hot melt adhesive is applied to the workpiece;
a second step of filtering out the hot melt adhesive accumulated downstream of the discharge port by applying pressure to the workpiece from below when switching from the applied state to a non-applied state in which the hot melt adhesive is not applied to the workpiece;
Including,
a roller is disposed below the workpiece and downstream of the discharge port, the roller rotating in a conveying direction of the workpiece in synchronization with a conveying speed of the workpiece;
The roller is
A circumferential portion corresponding to the length of the application range of the hot melt adhesive on the substrate;
an enlarged diameter portion having a diameter larger than that of the circumferential portion, the enlarged diameter portion applying pressure to the workpiece and filtering out the hot melt adhesive accumulated downstream of the discharge port;
A reduced diameter portion having a smaller diameter than the circumferential portion and arranged so as to face the workpiece side behind the enlarged diameter portion;
having
In the first step, the workpiece is aligned along the circumferential portion to bring the discharge port into contact with the workpiece;
In the second step, the hot melt adhesive accumulated downstream of the discharge port is filtered out by applying pressure to the workpiece by the enlarged diameter portion,
The coating method includes a third step of, after filtering out the hot melt adhesive, directing the reduced diameter portion toward the object to be coated, thereby separating the object from the discharge port.
Application method. A coating method for intermittently coating a hot melt adhesive from a coating gun onto a substrate being transported in a constant direction, comprising:
The application gun has a discharge port for discharging the hot melt adhesive,
A first step of contacting the discharge port with the workpiece in a coating state in which the hot melt adhesive is applied to the workpiece;
a second step of filtering out the hot melt adhesive accumulated downstream of the discharge port by applying pressure to the workpiece from below when switching from the applied state to a non-applied state in which the hot melt adhesive is not applied to the workpiece;
Including,
In the second step, the hot melt adhesive is filtered out by applying compressed air to the workpiece from below the workpiece.
Application method. The substrate is a sheet material for absorbent articles,
The hot melt adhesive contains a material that changes color when it comes into contact with excrement.
The coating method according to any one of claims 1 to 4. A coating device that intermittently coats a hot melt adhesive from a coating gun onto a coating object that is transported in a constant direction,
The coating gun has a discharge port for discharging the hot melt adhesive, and the discharge port is brought into contact with the workpiece in a coating state in which the hot melt adhesive is applied to the workpiece;
a filtering means for filtering out the hot melt adhesive accumulated between the coating gun and the workpiece by applying pressure to the workpiece from below and downstream of the coating gun when switching from the coating state to a non-coating state in which the hot melt adhesive is not coated on the workpiece ;
The coating device comprises: A coating device that intermittently coats a hot melt adhesive from a coating gun onto a coating object that is transported in a constant direction,
The coating gun has a discharge port for discharging the hot melt adhesive, and the discharge port is brought into contact with the workpiece in a coating state in which the hot melt adhesive is applied to the workpiece;
a filtering means for filtering out the hot melt adhesive accumulated downstream of the discharge port by applying pressure to the workpiece from below when switching from the coating state to a non-coating state in which the hot melt adhesive is not coated on the workpiece;
Equipped with
the filtering means is a roller that is vertically movable and is disposed below the workpiece and downstream of the discharge port, and rotates in a conveying direction of the workpiece in synchronization with a conveying speed of the workpiece;
In the coating state, the roller is in contact with the workpiece at a predetermined position,
When switching to the non-coating state, the roller contacts the workpiece above the predetermined position, thereby applying pressure to the workpiece and filtering out the hot melt adhesive that has accumulated downstream of the discharge port;
After the hot melt adhesive is filtered out, the roller is lowered to separate the workpiece from the discharge port.
Coating equipment. A coating device that intermittently coats a hot melt adhesive from a coating gun onto a coating object that is transported in a constant direction,
The coating gun has a discharge port for discharging the hot melt adhesive, and the discharge port is brought into contact with the workpiece in a coating state in which the hot melt adhesive is applied to the workpiece;
a filtering means for filtering out the hot melt adhesive accumulated downstream of the discharge port by applying pressure to the workpiece from below when switching from the coating state to a non-coating state in which the hot melt adhesive is not coated on the workpiece;
Equipped with
the filtering means is a roller that is disposed below the workpiece and downstream of the discharge port, and rotates in a conveying direction of the workpiece in synchronization with a conveying speed of the workpiece,
The roller is
A circumferential portion corresponding to the length of the application range of the hot melt adhesive on the substrate;
an enlarged diameter portion having a diameter larger than that of the circumferential portion, the enlarged diameter portion applying pressure to the workpiece and filtering out the hot melt adhesive accumulated downstream of the discharge port;
A reduced diameter portion having a smaller diameter than the circumferential portion and arranged so as to face the workpiece side behind the enlarged diameter portion;
having
In the coating state, the roller brings the discharge port into contact with the workpiece by guiding the workpiece along the circumferential portion of the roller,
When switching to the non-coating state, the roller applies pressure to the workpiece with the expanded diameter portion, thereby filtering out the hot melt adhesive that has accumulated downstream of the discharge port,
After filtering out the hot melt adhesive, the roller moves the reduced diameter portion toward the workpiece, thereby separating the workpiece from the discharge port.
Coating equipment. A coating device that intermittently coats a hot melt adhesive from a coating gun onto a coating object that is transported in a constant direction,
The coating gun has a discharge port for discharging the hot melt adhesive, and the discharge port is brought into contact with the workpiece in a coating state in which the hot melt adhesive is applied to the workpiece;
a filtering means for filtering out the hot melt adhesive accumulated downstream of the discharge port by applying pressure to the workpiece from below when switching from the coating state to a non-coating state in which the hot melt adhesive is not coated on the workpiece;
Equipped with
The filtering means is a blower that blows compressed air onto the workpiece from below the workpiece,
When switching to the non-coating state, the air blower blows compressed air onto the workpiece from below the workpiece to filter out the hot melt adhesive.
Coating equipment.

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