JPH1028917A - Method for cleaning nozzle of adhesive coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for cleaning the nozzle of an adhesive coater by introducing a liq. detergent into a die nozzle hole for extruding a hot-melt adhesive and washing off the deposit and foreign matter without disassembling a slot die. SOLUTION: A hot-melt adhesive is extruded from a slot nozzle to coat a substrate traveling continuously in contact with a slot die by this adhesive coater. In this case, a stop valve 9 for the adhesive is kept closed, an adhesive passage 7 on the downstream side of the stop valve 9 is branched, a liq. detergent inlet 23 is provided through a stop valve 20, a liq. detergent 21 is injected from the inlet 23, and the adhesive and foreign matter remaining in the adhesive passage are discharged from a slot nozzle hole 6 along with the detergent 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle cleaning method for an adhesive coating apparatus, in which a hot-melt type adhesive is extruded from a slot-shaped nozzle and is applied to a substrate continuously moving in contact with a slot die. About the method.

[0002]

2. Description of the Related Art As an example of an adhesive coating apparatus for extruding a hot-melt adhesive from a slot-shaped nozzle and applying the hot-melt adhesive onto a substrate that continuously moves in a state of contact with a slot die. An adhesive application device as shown in FIG. 2 is known. The structure of a conventional adhesive coating device will be briefly described with reference to FIG.

That is, FIG. 2 shows an adhesive coating apparatus configured to extrude a hot-melt type adhesive from a slot-shaped nozzle and apply the hot-melt type adhesive to a continuously moving base material in contact with a slot die. FIG. 2 shows a partial cross section of the slot die 1. The slot die 1 includes two die blocks 2 and 3 and is fastened by bolts 4. In addition, a shim plate 5 is interposed between the two die blocks 2 and 3, and a slot nozzle hole 6 which is an extrusion port of a hot-melt type adhesive is formed by the shim plate 5.
And 3 are formed.

In the die block 2, hot melt type adhesive passages 7 and 8 are formed.
At the time of opening operation, the hot melt adhesive supplied from the hot melt adhesive supply device 10 is received in the passage 7,
Further, the gas is circulated to the slot nozzle hole 6 through the passage 8.

[0005] Reference numeral 11 denotes a controller.
1 transmits a control signal to the solenoid control valve 12 and turns on and off the solenoid control valve 12 to open and close the air-operated on-off valve 9 by control air supplied from the control air supply unit 13. You.

[0006] The adhesive application device configured as described above is
The coated hot-melt adhesive 15 supplied from the adhesive supply device 10 continuously moves substantially in contact with the slot die 1 when the air-operated on-off valve 9 is opened, ie, the substrate 14. It is extruded upward from the slot nozzle hole 6 and is used for wide application. A series of these operations are controlled by the controller 11, and the application is intermittently performed by opening and closing the air-operated on-off valve 9.

[0007]

The above-mentioned prior art has the following problems. That is, since the hot melt adhesive 15 is intermittently applied in the present adhesive applying apparatus, the hot melt adhesive 15 deteriorates when the extrusion stop time is long or continuous operation is continued for a long time. This causes the deposits to be deposited on the portion of the slot nozzle hole 6, and the slot nozzle hole 6 may be narrowed. When such a phenomenon occurs, the product quality is significantly reduced.

Therefore, conventionally, when such a phenomenon occurs, the entire production line must be stopped, and the slot die 1 must be disassembled and cleaned, which requires a very large amount of work, and requires a lot of skill and a long time. Improvement was required.

The present invention has been made in view of the above-mentioned problems, and is intended to be applied to a case where the hot melt type adhesive 15 adheres and accumulates in the slot nozzle hole 6 to block the passage, or one day of operation. In order to allow the next start of work to be easily resumed when the operation is completed, a liquid cleaning agent is introduced into the extruded slot nozzle hole 6 of the hot-melt type adhesive without disassembling the slot die 1 so as to remove deposits and the like. It is an object of the present invention to provide a method for cleaning a nozzle of an adhesive application device, in which a foreign substance is washed away and washed.

[0010]

In order to solve the above-mentioned problems, the present invention provides the following method for cleaning a nozzle of an adhesive coating apparatus. That is, an adhesive application device configured to extrude a hot-melt type adhesive from a slot-shaped nozzle and apply the hot-melt type adhesive to a substrate (14) that continuously moves in a contact state with a slot die. The on-off valve (9) is maintained in a closed state, the adhesive passage (7) downstream of the on-off valve (9) is branched, and a liquid detergent inlet (23) is provided via the on-off valve (20). , The liquid detergent inlet (2
The liquid cleaning agent (21) is injected from 3), and the residual hot-melt type adhesive and foreign matter in the adhesive passage are discharged together with the liquid cleaning agent from the slot nozzle hole (6). The nozzle cleaning method of the adhesive coating device was adopted.

[0011] Further, in an adhesive coating apparatus configured to extrude a hot-melt type adhesive from a slot-shaped nozzle and apply the hot-melt type adhesive to a substrate (14) continuously moving in contact with a slot die, The on-off valve (9) for the adhesive is maintained in a closed state, the adhesive passage (7) downstream of the on-off valve (9) is branched, and the liquid detergent inlet (23) is opened via the on-off valve (20). ) Is provided, a liquid detergent (21) is injected from the liquid detergent inlet (23), and a residual hot-melt type adhesive and foreign matter in the adhesive passage together with the liquid detergent are removed from the slot nozzle hole (6). After discharging, a compressed air is introduced from the liquid cleaning agent inlet and the liquid cleaning agent remaining in the flow path is discharged to provide a nozzle cleaning method for the adhesive coating apparatus.

[0012]

Next, an embodiment of the present invention will be described. In the present invention, since the nozzle cleaning method of the adhesive applying apparatus of the above-described means is used, the slot nozzle hole (6) is used.
Waste and foreign substances of the hot melt adhesive adhered and deposited on the part and the like can be washed away together with the liquid detergent without disassembling the slot die. That is, first, the on-off valve (9) for the adhesive is closed, the adhesive passage (7) downstream of the on-off valve (9) is branched, and liquid is supplied from a liquid cleaning agent inlet provided through the on-off valve. When the cleaning agent is injected, the liquid cleaning agent enters the adhesive passages (7) and (8) downstream of the on-off valve (9) because the on-off valve (9) for the adhesive is kept closed. The adhesive waste and foreign substances adhering and accumulating in the slot nozzle hole (6) together with the remaining adhesive are washed out and discharged from the slot nozzle hole (6).

When the adhesive passages (7) and (8) and the slot nozzle hole (6) have been sufficiently cleaned, the on-off valve of the liquid detergent injection port is closed to return to a normal use state, that is, a restart state. Return. If the residual liquid cleaning agent in the system hinders restart production, after the cleaning operation using the liquid cleaning agent is completed, compressed air is further introduced from the liquid cleaning agent inlet to remove the residual liquid cleaning agent. These problems can be solved by discharging to the outside through the slot nozzle hole (6). In such a case, it is convenient to configure the on-off valve provided at the liquid cleaning agent injection port with a switching valve that can switch between the liquid cleaning agent and the compressed air.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a nozzle cleaning method for an adhesive coating apparatus according to the present invention will be specifically described with reference to the drawings showing embodiments thereof. FIG. 1 is an explanatory view showing the entire configuration of an apparatus for carrying out a nozzle cleaning method for an adhesive application apparatus according to the present invention. In the figure, components having the same functions as those of the conventional example will be described with the same reference numerals.

FIG. 1 shows a partial cross section of a slot die 1 of an adhesive applying apparatus for applying a hot-melt type adhesive onto a substrate which moves continuously in contact with the slot die. The slot die 1 includes two die blocks 2 and 3 and is fastened with bolts 4. Also 2
A shim plate 5 is interposed between the two die blocks 2 and 3, and a slot nozzle hole 6, which is an extrusion port of a hot-melt type adhesive, is formed between the die blocks 2 and 3 by the shim plate 5.

The die block 2 has hot melt type adhesive passages 7 and 8 formed therein.
At the time of opening operation, the hot melt adhesive supplied from the hot melt adhesive supply device 10 is received in the passage 7,
Further, the gas is circulated to the slot nozzle hole 7 through the passage 8.

Reference numeral 11 denotes a controller.
1 transmits a control signal to the solenoid control valve 12 and turns on and off the solenoid control valve 12 to open and close the air-operated on-off valve 9 by control air supplied from the control air supply unit 13. You.

Reference numeral 20 denotes an opening / closing valve provided for injecting a liquid detergent 21 by branching the adhesive passage 7 downstream of the opening / closing valve 9 for the adhesive. It is configured with a switching valve that can switch between two fluids, a cleaning agent 21 and a compressed air 22. The switching valve 20 has a liquid detergent inlet 23 for a liquid detergent 21 and a compressed air 22.
And a compressed air supply port 24 for supplying compressed air.

The switching valve 20 is normally maintained in a closed state. However, when performing nozzle cleaning, by switching the nozzle cleaning, the liquid cleaning agent 21 and the compressed air 22 can be selectively placed in the system, that is, in the system. It can be supplied to the adhesive passage 7. The type of the switching valve 20 is not particularly limited, such as a manual switching valve, an electromagnetic switching valve, or an air operated switching valve.

The adhesive coating apparatus having the above-described structure is
When a normal adhesive application operation is being performed, the switching valve 20 is maintained in the closed state, so that the hot-melt adhesive supplied from the adhesive supply device 10 is supplied by the control signal from the controller 11. It is pushed out of the slot nozzle hole 6 by the opening operation of the on-off valve 9 that opens and closes.

The hot-melt type adhesive extruded from the slot nozzle hole 6 is applied onto the substrate, that is, the substrate 14 which continuously moves in a substantially contact state with the slot die 1.
Widely applied. Since a series of these operations are performed intermittently by the controller 11, if the ejection stop time is long or continuous operation is continued for a long period of time, the hot melt adhesive deteriorates, and the slot nozzle hole 7 is deteriorated. The adhesion and deposition phenomenon occurs.

When such a phenomenon occurs, normal operation is temporarily stopped, and the nozzle is cleaned. The procedure of nozzle cleaning will be described. First, the hot-melt adhesive supply on-off valve 9 is kept closed. Next, a switching valve 20 provided by branching the adhesive passage 7 downstream of the on-off valve 9
Is operated so as to communicate with the liquid detergent 21, and the liquid detergent 21 is injected into the system from the liquid detergent inlet 23.

The liquid detergent 21 introduced into the system pushes out the hot-melt type adhesive remaining in the system from the passage 7 through the passage 8 to the slot nozzle hole 6 and adheres and deposits in the system. The waste products are washed away and discharged from the tip of the slot nozzle hole 6. Then, by observing the state of contamination of the liquid cleaning agent 21 discharged from the tip of the slot nozzle hole 6 and confirming that the inside of the system has been sufficiently cleaned, the switching valve 20 is returned to the closed state, and the slot nozzle hole 6 is closed. The cleaning operation is completed, and returns to the restart state.

In this cleaning operation, the liquid detergent 21 is contained in the system.
May remain. If the remaining liquid detergent 21 hinders restart production, the liquid detergent 2
These problems can be solved by operating the switching valve 20, introducing the compressed air 22 from the compressed air inlet 23 and discharging the residual liquid cleaning agent to the outside through the slot nozzle hole 7 after the cleaning operation by the step 1. . When the washing operation is completed, the switching valve 20 is closed,
Return to restart state.

As a liquid cleaning agent used for nozzle cleaning, it is most preferable to use a solvent of a hot melt type adhesive. However, depending on the type of the hot-melt adhesive, the cleaning operation may be performed more efficiently by using not only one type of liquid cleaning agent but also alternately using a plurality of types of liquid cleaning agents. For example, more effective cleaning may be performed by alternately injecting a solvent and heated oil.

[0026]

According to the present invention, since the nozzle cleaning method of the adhesive coating apparatus is used as described above, the phenomenon that the hot melt type adhesive adheres and deposits in the slot nozzle hole (6) or closes the passage occurs. In order to make it easy to restart the next operation when the operation of the day or the operation of the day is finished, without disassembling the slot die (1), the slot nozzle hole (6) for ejecting the hot-melt adhesive is used. By introducing a liquid cleaning agent into the nozzle and washing away the attached matter and foreign matter, the nozzle cleaning method of the adhesive coating apparatus can be provided which can be performed extremely easily and in a short time.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a nozzle cleaning method of an adhesive application device of the present invention.

FIG. 2 is an explanatory view of a conventional adhesive application device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Slot die, 2 ... Die block, 3 ... Die block, 6 ... Slot nozzle hole, 7 ... Passage, 9 ... Open / close valve, 20 ... Open / close valve (switching valve), 23 ... Liquid detergent injection port,

Claims (4)

[Claims] 1. An adhesive applying apparatus for extruding a hot-melt adhesive from a slot-shaped nozzle and applying the hot-melt adhesive onto a substrate continuously moving in contact with a slot die. The on-off valve (9) is maintained in a closed state, the adhesive passage (7) downstream of the on-off valve (9) is branched, and a liquid detergent inlet (23) is provided via the on-off valve (20). , The liquid detergent (2) from the liquid detergent inlet (23).
1) injecting, and discharging the hot-melt type adhesive and foreign matters remaining in the adhesive passage together with the liquid cleaning agent from the slot nozzle hole (6). Method. 2. The method for cleaning a nozzle of an adhesive application device according to claim 1, wherein a solvent is used as the liquid cleaning agent. 3. An adhesive coating apparatus configured to extrude a hot-melt adhesive from a slot-shaped nozzle and apply the hot-melt adhesive onto a substrate that continuously moves in a contact state with a slot die. The on-off valve (9) is maintained in a closed state, the adhesive passage (7) downstream of the on-off valve (9) is branched, and a liquid detergent inlet (23) is provided via the on-off valve (20). , The liquid detergent (2) from the liquid detergent inlet (23).
1) is injected, and the residual hot-melt type adhesive and foreign matter in the adhesive passage are discharged from the slot nozzle hole (6) together with the liquid cleaning agent, and then the compressed air (22) is discharged from the liquid cleaning agent injection port. And a liquid cleaning agent remaining in the flow path is discharged to discharge the liquid cleaning agent. 4. The method for cleaning a nozzle of an adhesive coating device according to claim 3, wherein a solvent is used as the liquid cleaning agent.