JPH0919654A - Coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct errors of coating positions on both the surfaces of a sheet- shaped material every coating operations to make the coating positions on both the surfaces almost the same. SOLUTION: This device is constituted of a backup roller 2 for conveying a sheet-shaped material 30 whose one surface is coated with a liquid at prescribed intervals in the longitudinal direction, a slit die 4 for applying a liquid 40 to a surface to be coated 30b which is the rear of the coated surface of the sheet-shaped material 30, and a liquid feeding pipe 5 for feeding the liquid 40 to the slit die 4. Detectors 20, 21 for detecting the coated positions in the longitudinal direction of the sheet-shaped material 30 whose both surfaces 30a, 30b are coated with the liquids are arranged downstream of the slit die 4 corresponding to the coated surfaces. Based on signals from the detectors 20, 21, the liquid feeding and stoppage action time of the liquid feeding pipe 5 is corrected to obtain the sheet-shaped material in which the coated positions of both surfaces are almost same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has already applied a liquid to a surface to be coated, which is located on the back side of the surface to be coated with the liquid on one surface of the front surface and the back surface. The present invention relates to a coating device that can coat the same position as a liquid that is being applied.

[0002]

2. Description of the Related Art Generally, when a synthetic resin liquid or a liquid such as a paint is applied to both sides of a sheet-like object to be applied such as a synthetic resin film, paper, a glass substrate, and a wafer,
As shown in FIG. 2, a coating material, which is a coating liquid, is applied to one surface of the front surface and the back surface of the sheet-shaped material at a predetermined interval in the longitudinal direction of the sheet-shaped material to run at a predetermined speed. A transport mechanism 1 including a backup roller 2 and a guide roller 3, and the backup roller 2
A liquid supply device 5 comprising a slit die 4 for discharging the coating material, which is installed in the vicinity of the coating material, a coating material storage tank 6 connected to the slit die 4, and a coating material supply pipe 8 having a metering pump 7. A device constituted by an input operation keyboard for rotating and stopping the metering pump 7, a control device 9 such as a microcomputer having an input function, a comparison function, a calculation function, an operation command function and the like is used.

A drive motor 10 having a rotation detector 11 is connected to the backup roller 2 described above.

Further, a detector 12 such as a photoelectric tube type sensor or a capacitance type sensor for detecting the tip of the paint applied to the sheet-like material is installed at a position close to the peripheral surface of the backup roller 2. Has been done.

The number of rotations of the electric motor 10 detected by the rotation detector 11 and the detection signal of the tip of the coating position by the detector 12 are sent to the controller 9.

As shown in FIG. 3, the slit die 4 has a die body 13 having a paint supply port (not shown) and a slit-shaped liquid discharge port 13a in the width direction, and a die body having a shaft portion 14a. 13, side plates 14 attached to both ends of the shaft 13, bearings 15 installed on the machine frame 19 to rotatably support the shaft portion 14a, an arm 16 integrally attached to the shaft portion 14a, and a piston rod 17b. The end portion of the cylinder body 17a is attached to the arm 16 by the joint metal fitting 18 and the machine frame 1
9 and fluid cylinders 17 attached to the respective cylinders 9.

The fluid cylinder 17 is connected to a pressure fluid supply pipe (not shown) having a pressure control valve, a solenoid valve for switching a pipe line, etc., and the pipe line is opened by an operation command signal from the controller 9. It can be switched.

When the piston rod 17b of the fluid cylinder 17 is retracted, the die body 13 is rotated counterclockwise, and the piston rod 17b projects to the coating position where the liquid discharge port 13a faces the peripheral surface of the backup roller 2. Then, the die main body 13 is rotated clockwise and the liquid discharge port 1
3a moves to the standby position.

The relationship between the rotating operation of the die body 13 and the rotation stopping operation of the metering pump 7 is that the metering pump 7 rotates after the die body 13 rotates and the liquid discharge port 13a is moved to the coating position. Then, the metering pump 7 is stopped and the supply of the paint is stopped, and then the die body 13 is rotated to return the liquid discharge port 13a to the standby position.

A cleaning device (not shown) is installed below the die body 13 described above. When the die body 13 rotates and the liquid discharge port 13a moves to the standby position, the cleaning device (not shown). No. 3) the cleaning sheet member, the paint dripping from the liquid discharge port 13a or the liquid discharge port 13
It is designed to wipe off the paint and the like adhering to part a.

The coating of the coating material in the coating apparatus described above is performed as follows.

The backup roller 2 and the guide roller 3 are rotated at a preset speed to apply a coating material on one surface 30a in the longitudinal direction at a predetermined interval and the sheet-like material 30.
When is conveyed, the rotation detector 11 detects the number of rotations of the electric motor 10 and sends it to the controller 9.

The tip end of the coating material 40a applied to the sheet-shaped material 30 when the sheet-shaped material 30 is conveyed is detected by the detector 12
Therefore, upon detection, the detection signal is sent to the control device 9.

Then, in the control device 9, the electric motor 10
The rotation timing of the die main body 13 for starting the coating operation and the supply start timing of the coating material 40 are calculated from the rotation speed of.

Then, when the sheet 30 is conveyed and the time or the number of revolutions calculated by the controller 9 elapses, the pipeline of the pressure fluid supply pipe (not shown) of the fluid cylinder 17 is switched. When the piston rod 17b is retracted, the die body 13 is rotated and the liquid discharge port 13a is moved to the coating position, the metering pump 7 is operated and the die body 1 is moved.
The paint is discharged from 3.

When the coating surface 30b of the sheet 30 is coated with the coating material 40b for a preset length, the metering pump 7 is stopped to stop the coating material 40 on the coating surface 30b. The conduit of the pressure fluid supply pipe (not shown) of the fluid cylinder 17 is switched, the piston rod 17b projects, the die body 13 is rotated, and the liquid discharge port 13a is returned to the standby position.

By repeating the above-described operation, the coating materials 40a and 40b are applied to the same position on both surfaces of the sheet-like material 30 at a predetermined interval.

[0018]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention The liquid supply stop operation timing is determined from the leading edge detection signal of the coating position of the coating material applied to one surface of the sheet-like material and the sheet-like material conveying speed. In the method of calculating and controlling, the application start position and the application end position change due to the slip of the sheet material, the expansion and contraction of the sheet material, etc., causing an error in the application position on both sides of the sheet material, and use it as a product. There is a problem that you can not do.

The present invention solves the above problems and provides a coating apparatus capable of correcting the coating position error on both sides of a sheet-shaped article for each coating operation so that the coating positions on both sides are substantially the same. The purpose is to do.

[0020]

In order to solve the above-mentioned problems, the coating apparatus of the present invention detects the coating position in the longitudinal direction of the sheet-like material applied to both sides of the sheet-like material at the position downstream of the slit die. The detectors are arranged corresponding to the coating surface, and the liquid supply stop operation of the liquid supply device is controlled based on the signals from the detectors.

[0021]

With respect to the slit die based on the signals from the two detectors for detecting the coating position of the liquid applied on the front and back surfaces of the sheet-like object disposed on the downstream side of the slit die in the longitudinal direction of the sheet-like object. The liquid supply stop operation timing is feedback controlled.

[0022]

FIG. 1 is a schematic view showing an embodiment of the coating apparatus of the present invention. Since the structure of the coating apparatus is the same as that of the coating apparatus shown in FIGS. 2 and 3, the description thereof will be omitted.

At the downstream side position of the slit die 4 in FIG. 1, the coating material 4 applied to the surface 30a of the sheet-like material 30.
A detector 20 for detecting the front end or the rear end of the application position of 0a, and a detector 21 for detecting the front end or the rear end of the application position of the coating material 40b applied to the back surface 30a of the sheet-like material 30. Is provided, and the signals detected by the detectors 20 and 21 are sent to the controller 9.

As the above-mentioned detectors 20 and 21, a photoelectric tube type sensor, an electrostatic capacitance type sensor or the like is used.

The correction of the coating position in the above coating apparatus is performed as follows.

The sheet material 30 is conveyed by the backup roller 2 and the guide roller 3, the detector 12 detects the coating material 40a applied to the sheet material 30, and the coating portion of the coating material 40a is on the die body 13. When it moves to the coating position, the metering pump 7 operates and the coating material is ejected from the liquid ejection port 13a of the die body 13 to apply the coating material 40b to the coated surface 30b of the sheet-like material 30.

When the time calculated based on the preset coating length elapses, the metering pump 7 is stopped and the supply of the coating material 40 is stopped, and then the fluid cylinder 17 is operated to operate the die body 13. Is returned to the standby position.

By this operation, paints 40a and 40b are applied on both sides.
The sheet-like material 30 coated with is conveyed, and the tip ends of the coated coating materials 40a and 40b are detected by the detectors 20 and 21 installed at the downstream side of the die body 13, and the detection signals are controlled respectively. When it is sent to the device 9, the deviation amount (α) of the coating position is calculated based on the difference in the detection time, and the rotation number from the rotation detector 11 and the coating position from the detector 12 in the next coating operation of the coating material 40. The rotation start time of the metering pump 7 calculated based on the detection signal is corrected.

The operation time of the fluid cylinder 17 for rotating the die body 13 is corrected according to the correction amount of the rotation start time of the metering pump 7.

The position error is corrected at the front end of the coating position, the sheet-like material 40 is conveyed, and the rear end of the coating position is located at the downstream side of the die body 13 in the detectors 20, 21. When the detection signals are transmitted to the control device 9 respectively by the detection by the, the deviation amount of the coating position is calculated based on the difference of the detection time, and the rotation number from the rotation detector 11 is calculated in the next coating operation of the coating material 40. The rotation stop time of the metering pump 7 calculated based on the application position detection signal from the detector 12 is corrected.

When the coating material is intermittently applied to both sides of the sheet-like material, the correction operation is sequentially performed for each coating position of the coating material.

Both sides of the sheet material 30 are corrected by correcting the displacement of the front end portion of the coating positions of the coating materials 40a and 40b applied on both sides of the sheet material 30 and the displacement of the rear end portion of the coating position. 40a, 40 applied to the
The coating positions of b can be made substantially the same.

In this embodiment, the coating material is applied to the same positions on the front and back surfaces, but it is possible to apply the coating material by shifting it by a predetermined dimension and to change the coating length on the front and back surfaces.

Although rollers such as backup rollers are used for the transport mechanism 4 in the above-described embodiment, a conveyor, a transport carriage, etc. can be used depending on the material and shape of the sheet material.

In addition, the slit die 4 includes the die body 13
Although it is configured to rotate by 0 ° to move from the coating position to the standby position, it is also possible to arrange the coating position and the standby position on the same line to linearly move the die body 9.

Further, the liquid supply device 5 connected to the slit die 4 can use a liquid supply pipe having a storage tank, a metering pump, an electromagnetic switching valve, etc. Depending on the nature of the liquid, the storage tank, the liquid supply It is necessary to heat or keep the tubes and the like warm.

Instead of the above rotation detector 11, a detector for detecting the number of revolutions of the backup roller 2 or a detector for detecting the peripheral speed of the backup roller 2 can be installed.

[0038]

According to the coating apparatus of the present invention, a detector for detecting the coating position in the longitudinal direction of the sheet material of the liquid coated on both sides of the sheet material at the position downstream of the slit die is provided for each coating surface. Since it is arranged to control the liquid supply stop operation of the liquid supply mechanism based on the signal from each of the detectors, it is possible to detect the coating positions on both surfaces for each coating and correct the error. Therefore, it is possible to surely obtain the sheet-shaped material applied at substantially the same position.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing one embodiment of the configuration of a coating apparatus of the present invention.

FIG. 2 is a schematic front view showing an example of the configuration of a conventional coating apparatus.

3 is a schematic perspective view showing one embodiment of the configuration of the slit die in FIG.

[Explanation of symbols]

 1 Transport Mechanism 2 Backup Roller 3 Guide Roller 4 Slit Die 5 Liquid Supply Device 6 Storage Tank 7 Metering Pump 8 Paint Supply Pipe 9 Control Device 10 Electric Motor 11 Rotation Detector 12, 20, 21 Detector 13 Die Body 14 Side Plate 15 Bearing 16 Arms 17 Fluid Cylinder 18 Joint Bracket 19 Machine Frame 30 Sheet Material 40 Synthetic Resin Film 13a Liquid Discharge Port 13b Liquid Supply Port 14a Shaft Part 17a Cylinder Body 17b Piston Rod

Claims (1)

[Claims] 1. A transport mechanism for transporting a sheet-like material coated with liquid at one side of a sheet-like article at a predetermined interval in the longitudinal direction, and a cover on the back side of the coated surface of the sheet-like article. In a device constituted by a slit die for applying a liquid to an application surface and a liquid supply device for supplying a liquid to the slit die, the liquid applied on both sides of the sheet-like material at a position downstream of the slit die. A detector for detecting the coating position in the longitudinal direction of the sheet-like material is arranged corresponding to each coating surface, and the liquid supply stop operation of the liquid supply device is controlled based on the signal from each detector. A coating device characterized by the above.