JPH08141488A - Washing device for coating apparatus - Google Patents

Abstract

PURPOSE: To shorten washing time with a washing device for a coating apparatus for applying a coating material by circulating a washing liquid between a washing liquid tank and a coating material supplying section, bringing a washing liquid wiping section into contact with the peripheral surface of a coater roll or reverse roll and wiping away the coating material together with the washing liquid. CONSTITUTION: A pump 32 is connected to the coating material tank 40 via a selector valve 34 and the coating material 16 of the coating material tank 40 is supplied to a coating material pool 14 formed by the coater roll 10 and the reverse roll 12 when a sheet material 22 is coated with the coating material 16. On the other hand, the selector valve 34 is changed over to connect the supply pump 32 to the washing liquid tank 43 to supply the washing liquid 44 in the washing liquid tank 42 to the coating material pool 14 when the coater roll 10 is washed. At this time, the washing liquid 44 is circulated via a receiving tray 46 to the washing liquid tank 42 and a wiping device 60 is advanced to bring the wiping sheet 62 into pressurized contact with the coater roll 20 by a pressure contact pad 64, by which the washing liquid 44 and the coating material 16 sticking to the coater roll 10 are wiped away.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to plywood, half board,
A cleaning device for a coating device that applies a coating material such as paint or varnish onto a flat plate material such as a wood board, a pulp cement board, or a gypsum board, and in particular, applies the coating material continuously with a coating roll (coater roll). And a device for cleaning a roll of a coating device capable of performing

[0002]

2. Description of the Related Art An apparatus for applying a coating material such as paint or varnish to a plate material by means of a roll is a coating material supply device for applying the coating material to a peripheral surface of a coater roll for transferring the coating material to the plate material to a predetermined thickness. As such, a roll provided with a reverse roll (doctor roll) that rotates in the opposite direction to the coater roll is widely used. Then, when changing the color of the coating material applied to the plate material, or when stopping the coating line, after the coating material remaining in the coating material supply device is extracted while the roll is rotated, the pump of the coating material supply device is turned on. Switch to a cleaning liquid tank that stores cleaning liquid consisting of solvent such as thinner, connect it, supply the cleaning liquid to the coating material supply part, contact the coater roll, reverse roll, and clean the coater roll or reverse roll There is.

[0003]

However, in the conventional cleaning operation of the coater roll or the reverse roll, since the cleaning liquid (solvent) is simply supplied to the surface of the roll for cleaning, there is a drawback that the cleaning takes time. is there. For example, in the case of a typical varnish coating, a roll cleaning operation is performed in the following order: coating completion → valve switching → coating material removal → solvent supply cleaning → solvent application to roll → wiping work → cleaning operation completion. And about 1 to remove the coating material
It takes 0 minutes, about 5 minutes for the solvent circulation cleaning, about 5 minutes for applying the solvent to the roll, and about 1 minute for the wiping operation.
Moreover, the conventional cleaning work requires a worker to apply the solvent to the roll by using a container after the solvent is circulated and cleaned, and a wiping work, which is not only a great burden on the worker but also rotating. Contact with rolls is dangerous. Further, the application of the solvent by the operator requires about 1 liter of the solvent for one roll, and the amount of the solvent used increases.

In order to shorten the cleaning time or improve the coating quality, it is preferable that an operator manually wipes the rolls, but since the rolls come into direct contact with the rolls rotating at high speed, there is a risk of being caught in the rolls. There is a safety issue. Therefore, under the present circumstances, the above cleaning must be performed. In addition, when the coating line is stopped, if the coating material remaining in the coating material supply device is left as it is, the coating material will be hardened and the next operation will be difficult. It is necessary to carry out cleaning with circulating solvent.

The present invention has been made to solve the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a cleaning apparatus for a coating apparatus which can shorten the cleaning operation time.

[0006]

In order to achieve the above object, a cleaning apparatus for a coating apparatus according to the present invention supplies a coating material tank with a coating material tank to supply the coating material such as paint to a plate material. The coating material supply unit to which the applied coating material is attached, a cleaning liquid tank that stores a cleaning liquid to be supplied to the coating material supply unit when cleaning the coater roll or the reverse roll, and the cleaning liquid supplied to the coating material supply unit. A return pipe for returning to the cleaning liquid tank, and is connected to the coating material tank via a switching valve when the coating material is applied to the plate material by the coater roll, and the coating material in the coating material tank is supplied to the coating material supply unit. While supplying the cleaning liquid tank, the cleaning liquid tank is connected to the cleaning liquid tank through the switching valve when cleaning the coater roll or the reverse roll, and the cleaning liquid tank is supplied to the coating material supply unit to supply the cleaning liquid tank. A pump that circulates a cleaning liquid between the cloth material supply unit and the pump is provided in the vicinity of the coater roll or the reverse roll, and at the time of cleaning the coater roll or the reverse roll, at least one of the rolls comes into contact with the peripheral surface of the roll. And a cleaning liquid wiping portion for wiping off the cleaning liquid. The cleaning liquid wiping unit can be configured to have a wiping sheet that wipes the cleaning liquid on the peripheral surface of the roll, and a metal pressure pad that presses the wiping sheet against the peripheral surface of the roll.

[0007]

According to the present invention constructed as described above, the cleaning liquid is circulated between the cleaning liquid tank and the coating material supply section when the roll having the coating material adhered thereto is cleaned, and the cleaning liquid is wiped on the peripheral surface of the coater roll or the reverse roll. Since the parts are brought into contact and the coating material is wiped off together with the cleaning liquid, the coating material can be removed early and the cleaning time can be greatly shortened. When the pressure-bonding pad of the cleaning liquid wiping unit is made of metal, for example, when cleaning a varnish with a large viscosity coefficient, even if the pressure-bonding pad is strongly pressed against the roll, it is deformed by the rotation of the roll like rubber or sponge. Without doing so, the life of the pressure bonding pad can be made semi-permanent, and maintenance of the cleaning liquid wiping portion can be facilitated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a coating apparatus cleaning apparatus according to the present invention will be described in detail with reference to the accompanying drawings. FIG.
FIG. 3 is an explanatory view of a coating apparatus cleaning apparatus according to an embodiment of the present invention.

In FIG. 1, the coater roll 10 has a peripheral surface in contact with a reverse roll (doctor roll) 12, and a groove formed by the peripheral surfaces of both is a coating material pond 14 which is a coating material supplying portion. Then, a coating material 16 such as paint or varnish is supplied to the coating material pond 14. These coater rolls 10 and reverse rolls 12
Means that they rotate in mutually opposite directions as shown by arrows 17 and 18, and when they rotate, the coating material 16 is attached to the peripheral surface of the coater roll 10 in a uniform thickness. Is able to. The coater roll 10 is generally provided with rubber having an appropriate hardness on its peripheral surface, and the coating material adheres to the coater roll 10 depending on the pressure contact force of the reverse roll 12 which is a metal roll, the concentration of the coating material, and the like. The amount (application amount) is adjusted.

A backup roll 20 is disposed below the coater roll 10, and a plate material 22 such as plywood is passed between the backup roll 20 and the coater roll 10, which rotate as indicated by an arrow 21, to thereby form the coater roll. 10
The coating material 16 attached to the plate material 22 is transferred onto the plate material 22 for coating. And backup roll 2
Before and after 0, the sheet material 22 is fed between the coater roll 10 and the backup roll 20, and the sheet material 22 that has passed between the rolls 10 and 20 is conveyed as indicated by arrows 24. There is.

A coating material supply pipe 30 is arranged above the coating material pond 14 constituted by the coater roll 10 and the reverse roll 12. This coating material supply pipe 30
A supply pump 32 whose drive and stop are controlled by a controller (not shown), a coating material supply device is configured with a coating material tank 40 that stores paint, varnish, etc., and the coating material 16 discharged from the supply pump 32 is supplied to a supply pipe. It is supplied to the coating material pond 14 via 30. That is, the pump 32
The suction side of is connected to a coating material tank 40 via a switching valve 34 and a pipe 36, sucks the coating material 16 in the coating material tank 40, and feeds the coating material pool 14 via a coating material supply pipe 30. It can be supplied to. In addition, the switching valve 34 has a pipe 3
8 is connected to the cleaning liquid tank 42, and when the coater roll 10 is cleaned, the suction side of the supply pump 32 is the cleaning liquid tank 42.
The cleaning liquid 44 made of an organic solvent such as thinner in the cleaning liquid tank 42 is supplied to the coating material pond 14.

On the other hand, a tray 46 for receiving the coating material 16 and the cleaning liquid 44 is arranged above the backup roll 20 so that the coating material 16 and the cleaning liquid 44 in the coating material pond 14 can be dropped onto the tray 46. I am doing it. A return pipe 48 is connected to the bottom of the tray 46. The return pipe 48 includes a switching valve 50 and pipes 52, 5
4 is connected to the coating material tank 40 and the cleaning liquid tank 42 via the connector 4, and the coating material 16 or the cleaning liquid 44 in the tray 46 can be returned to the coating material tank 40 or the cleaning liquid tank 42. . Further, a cleaning liquid wiping device 60 is arranged on the side of the coater roll 10 so as to face the coater roll 10.

The cleaning liquid wiping device 60 is provided so as to be movable back and forth with respect to the coater roll 10.
2 mainly includes a pressure-bonding pad 64 for pressing the wiping sheet 62 against the coater roll 10 at the time of cleaning, a sheet feeding unit 66 for feeding the wiping sheet 62, and a sheet winding unit 68 for winding the wiping sheet 62. It is as shown in.

The wiping device 60 is provided with a frame composed of a main stay 70 arranged in parallel with the axis of the coater roll 10 and side plates 72 supporting both ends of the main stay 70. The main stay 70 has an L-shaped cross section, and has a flat surface facing the coater roll 10. A pad base 74 is fixed to the flat surface of the main stay 70, and a pressure bonding pad 64 is fixed to the front surface of the pad base 74 so as to face the peripheral surface of the coater roll 10. Then, the crimp pad 64 is
It has a structure in which a Teflon sheet 78 is used to wrap a sticky gel (viscoelastic body) 76 to which a hardening agent, a tackifier, etc. is added on a base material such as polyethylene gel or silicon gel, and a semicircular cross section is formed. The flat portion is fixed to the pad base 74. The pressure pad 64 is
It may be made of solid rubber or sponge.

A sheet supply unit 66 is arranged at the rear of the main stay 70. The sheet supply unit 66 includes a core tube mounted on a feeding shaft 80 pivotally supported by the side plate 72, and a sheet roll 82 having a wiping sheet 62 made of a nonwoven fabric wound around the core tube. At the time of cleaning, the wiping sheet 62 is fed in a direction opposite to the rotating direction 17 of the coater roll 10. The wiping sheet 62 fed from the sheet supply unit 66 is wound around the winding shaft 84 of the sheet winding unit 68 provided on the rear side of the sheet supply unit 66. Further, the sheet winding section 68 is provided with a constant-size winding mechanism 86.

The constant-size winding mechanism 86 has a lever portion 90 for rotating the winding shaft 84 by a rod 89 of a cylinder mechanism 88 attached to the side plate 72, and a spring 91.
The wiping sheet 62 is wound up when the rod 89 extended by the pulling operation is performed. That is, a regulation lever 92 for regulating the return movement amount of the lever portion 90 is rotatably attached to the side plate 72.
The regulating lever 92 has a base end pivotally attached to the side plate 72, and a roller 94 that comes into contact with the wiping sheet 62 wound around the winding shaft 84 is rotatably provided at the tip end of the regulating lever 92. A cam curve portion 96 for restricting the stroke amount of the rod 89 of the cylinder mechanism 88, that is, the return movement amount of the lever portion 90 is formed at a position of the lever portion 90 corresponding to the roller 94. Roller 9 on cam curve portion 96
Even when the shaft 98 to which 4 is attached contacts the stroke amount of the rod 89 to change the winding diameter of the wiping sheet 62, the winding length of the wiping sheet 62 by the winding shaft 84 is always constant. It is supposed to be adjusted. A coil spring 100 is attached to the pivot shaft of the restriction lever 92, and one end of the spring 100 is locked by the restriction lever 92 to urge the restriction lever 92 counterclockwise in FIG. , The shaft 98 and the cam curve portion 96 of the lever portion 90.
Is pressed into engagement.

A guide block 102 is fixed to the outer lower portions of a pair of side plates 72 supporting both ends of the main stay 70. The rear end side of the guide block 102 is fixed to the rod 106 of the advancing / retreating cylinder 104 attached to the main body frame (not shown) of the coating device, and the advancing / retreating cylinder 104 is operated to make the cleaning liquid wiping device 60 coatable. It is possible to move forward and backward with respect to Le 10. That is, the guide block 10 of the wiping device 60
2 is movable along a guide rail 108 provided on the main body frame side of the coating apparatus.
When cleaning 0, the advancing / retreating cylinder 104 moves the guide block 10
The cleaning liquid wiping device 60 is advanced along the guide rails 108 via the two, and the wiping sheet 62 can be pressed against the coater roll 10.

Further, the wiping device 60, as shown in FIG. 3, has a detaching mechanism 110 equipped with a double-acting air cylinder,
It has 112 and can be detachably attached to the main body frame of the coating apparatus. Each attachment / detachment mechanism 110, 112 is connected to a 2-position 5-port switching valve 122 provided in a control box 121 via flow rate adjusting valves 114, 116 and conduits 118, 120. A cylinder mechanism 88 for rotating the take-up roll 68 is connected to a 2-position 5-port switching valve 126 in the control box 121 via a pipe line 124. The inflow sides of these switching valves 122 and 126 are connected to a high pressure air source 130 via a pipe line 128. It should be noted that the conduit 128 has a manual valve 132, an air filter 134, and a pressure control valve 1
36 and a pressure gauge 138 are provided so that the pressure of high-pressure air supplied to each cylinder can be easily adjusted.

In the coating apparatus cleaning apparatus of the embodiment thus configured, when the coating material 16 is applied to the plate material 22, the cleaning liquid wiping apparatus 60 is separated from the coater roll 10. Then, the supply pump 32 is connected to the coating material tank 40 via the switching valve 34, and the coating material 1 in the coating material tank 40 is
6 is sucked and supplied to the coating material pond 14 formed by the coater roll 10 and the reverse roll 12. Coating material pond 1
The coating material 16 in 4 adheres to a predetermined thickness as the coater roll 10 and the reverse roll 12 rotate,
It is transferred and applied to the plate material 22 passing between the coater roll 10 and the backup roll 20.

On the other hand, when the coater roll 10 is washed, first, the coater roll 10 and the reverse roll 12 are rotated, and the coater material is removed by the coater supply device. That is, when a cleaning start command is given to a controller (not shown), the controller switches the switching valves 34 and 50 to connect the supply pump 32 and the return pipe 48 to the cleaning liquid tank 42.
Connect to. Then, the cleaning liquid 44 such as thinner in the cleaning liquid tank 42 is sucked by the supply pump 32 through the pipe 38 and the switching valve 34, supplied to the coating material pond 14 through the supply pipe 30, and then guided to the receiving tray 46. Return piping 48,
It is returned to the cleaning liquid tank 42 via the switching valve 50 and the pipe 54. In this way, the controller operates the coater roll 10
And the reverse roll 12 are rotated, the cleaning liquid 44
After the coating material is circulated for about 5 to 10 minutes, the advancing / retreating cylinder 104 of the cleaning liquid wiping device 60 is driven to move the wiping device 60 toward the coater roll 10.
The wiping sheet 62 is pressed against the coater roll 10 by the pressure bonding pad 64 while circulating the cleaning liquid. This allows
The coating material and the cleaning liquid attached to the coater roll 10 are wiped off by the wiping sheet 62 as the coater roll 10 rotates.

The wiping sheet 62 is unwound from the sheet roll 82 and wound around the winding shaft 84 at an appropriate preset time interval. That is, when the pressure pad 64 is pressed against the coater roll 10 for 5 seconds, for example, the controller retracts the cleaning liquid wiping device 60 slightly for 2 seconds by retracting the rod of the advancing / retreating cylinder 104.
At this time, the controller switches the switching valve 126 in the control box 121 shown in FIG.
6, the high pressure air is supplied to the cylinder mechanism 88, and the rod 89
2 and the winding shaft 84 is rotated counterclockwise in FIG. 2, and the wiping sheet 62 is wound while being pulled out from the sheet roll 82 by a certain amount. Then, after 2 seconds have elapsed, the controller extends the rod of the advancing / retreating cylinder 104 and advances the wiping device 60 again to bring the pressure bonding pad 64 into pressure contact with the coater roll 10, and at the same time, the switching valve 126 is switched to change the cylinder mechanism 88. High pressure air to the
The rod 89 advances by a constant stroke defined by the cam curve portion 96 of the lever portion 90 and the shaft 98. By repeating such an operation a plurality of times, the clean wiping sheet 62 comes into contact with the coater roll 10 and promotes cleaning of the coater roll 10. Also, the reverse roll 12
Is washed by the cleaning liquid 44 in the coating material pond 14 by rotating. When the cleaning is completed after a predetermined time has elapsed, the controller controls the advancing / retreating cylinder 104 to retract the cleaning liquid wiping device 60 and switches the switching valves 34 and 50 to the coating material tank 40 side.

By thus wiping off the cleaning liquid 44 and the coating material 16 adhering to the coater roll 10 by the wiping sheet 62, the cleaning time which was conventionally required for about 10 minutes can be shortened to about 3 minutes, The efficiency of cleaning work can be significantly improved. Moreover, it is possible to eliminate the work of solvent coating and hand-wiping by the operator, which has been conventionally required, and it is possible to improve work safety. Moreover, since only the cleaning liquid is circulated, the amount of the cleaning liquid used can be reduced. And the switching valve 3
The cleaning using the coating material supply device can be performed only by switching 4 and 50, and the cost of the cleaning device can be reduced.

FIG. 4 shows another embodiment of the crimping pad. The pressure-bonding pad 140 shown in FIG.
For example, the cross section is formed into a substantially circular shape by a metal such as aluminum or hard rubber. Then, the crimping pad 140 is screwed to the pad base 74 so that replacement or the like can be easily performed. The pressure bonding pad 142 shown in FIG. 4B has a structure in which the cross section is formed of metal or hard rubber into a rectangular shape and is directly screwed to the main stay 70. Further, the pressure bonding pad 144 shown in FIG. 4 (3) has a triangular cross section so as to be suitable for wiping a metallic roll. The pressure-bonding pad 144 has a structure in which the viscoelastic body 76 is covered with a Teflon sheet 78, like the pressure-bonding pad 64 shown in FIG. 2, and one side thereof is bonded to the pad base 74.

The case where the semi-circular crimping pad shown in FIG. 2 and the triangular crimping pad shown in FIG. 4 (3) are formed by the viscoelastic body and the Teflon sheet has been described. A pressure pad may be formed by forming a semicircle or a triangle with a metal such as aluminum. As described above, when the pressure-bonding pad is made of metal, when cleaning a coating material having a large viscosity coefficient such as varnish, even if the pressure-bonding pad is strongly pressed against the roll, the pressure-sensitive pad may be dragged by the rotation of the roll to be deformed. The cleaning sheet can be wiped well by the wiping sheet, and the life of the pad can be made semi-permanent.
Maintenance of the cleaning liquid wiping device becomes easy.

In the above embodiment, the case where the coater roll 10 is wiped by the cleaning liquid wiping device 60 has been described, but the reverse roll 12 may be wiped, or both rolls may be wiped. Good. The shape of the pressure-bonding pad is not limited to the above-mentioned embodiments, and may be another shape. Further, in the above-mentioned embodiment, the coating device having the reverse roll 12 has been described, but the present invention can also be applied to a coating device in which the coating amount of the coating material on the coater roll 10 is adjusted by a blade. Further, in the above embodiment,
The wiping operation pattern is the pressure pad 64 on the coater roll 10.
Although the case has been described in which the is pressed for 5 seconds and separated for 2 seconds, the wiping operation is not limited to this. Further, in the above embodiment, the case where the controller automatically performs the cleaning has been described, but the cleaning may be performed manually.

[0026]

As described above, according to the present invention, the cleaning liquid is circulated between the cleaning liquid tank and the coating material supply section, and the coater roll or the reverse roll is used at the time of cleaning the roll to which the coating material adheres. Since the cleaning liquid wiping part is brought into contact with the peripheral surface of and the coating material is wiped off together with the cleaning liquid, the coating material can be removed early and the cleaning time can be greatly shortened. When the pressure-bonding pad of the cleaning liquid wiping unit is made of metal, for example, when cleaning a varnish with a large viscosity coefficient, even if the pressure-bonding pad is strongly pressed against the roll, it is deformed by the rotation of the roll like rubber or sponge. Without doing so, the life of the pressure bonding pad can be made semi-permanent, and maintenance of the cleaning liquid wiping portion can be facilitated.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a coating apparatus cleaning apparatus according to an embodiment of the present invention.

FIG. 2 is a detailed explanatory diagram of the cleaning liquid wiping device according to the embodiment.

FIG. 3 is a diagram showing a high pressure air piping system according to an embodiment.

FIG. 4 is a diagram showing another embodiment of the crimping pad.

[Explanation of symbols]

 10 coater roll 12 reverse roll 14 coating material supply unit (coating material pond) 16 coating material 20 backup roll 22 plate material 32 supply pump 34, 50 switching valve 40 coating material tank 42 cleaning liquid tank 60 cleaning liquid wiping device 62 wiping sheet 64 crimping pad 66 Sheet feeding unit 68 Sheet winding unit 86 Fixed-size winding mechanism 88 Cylinder mechanism 104 Forward / backward cylinder

Claims (2)

[Claims] 1. A coating material supply unit for depositing a coating material supplied from a coating material tank on the surface of a coating roll for applying a coating material such as paint to a plate material, and the coating when cleaning the coater roll or the reverse roll. A cleaning liquid tank that stores the cleaning liquid to be supplied to the material supply unit, a return pipe that returns the cleaning liquid supplied to the coating material supply unit to the cleaning liquid tank, and a switch when the coating material is applied to the plate material by the coater roll. The cleaning liquid tank is connected to the coating material tank via a valve and supplies the coating material in the coating material tank to the coating material supply unit, and also through the switching valve when cleaning the coater roll or the reverse roll. And a pump for supplying the cleaning liquid in the cleaning liquid tank to the coating material supply unit to circulate the cleaning liquid between the cleaning liquid tank and the coating material supply unit, and the coater roll or A cleaning liquid wiping unit which is provided in the vicinity of the berth roll and wipes the cleaning liquid by contacting at least one of the peripheral surfaces of these rolls when cleaning the coater roll or the reverse roll. Cleaning device. 2. The cleaning liquid wiping unit includes a wiping sheet that comes into contact with the peripheral surface of the roll to wipe the cleaning liquid, and a metal pressure pad that presses the wiping sheet against the peripheral surface of the roll. The cleaning device for a coating device according to claim 1.