JPH0751618A - Method for controlling coating film thickness of roll coater device - Google Patents

Abstract

PURPOSE:To execute rolling reduction uniformly on both sides by calculating parallelism with good accuracy and to eliminate one-sided rolling reduction even if the thickness of an object to be coated is small by calibrating the parallelism of a coater roll by using a rigid roll in pace of a rubber roll. CONSTITUTION:The ridig roll for calibration consists of a roll body 61 for calibration and a roll barrel 62 for calibration. The roll barrel 62 for calibration is formed to have the outside diameter (e) and inside width (b) larger than (the max. thickness (c) of an object 4 to be coated)X2+(the outside diameter (d)) and width (a) of the roll body 61 for calibration. The applicator roll is removed and the roll for calibration is mounted while the object 4 to be coated is made to remain at the time of investigating or calibrating the parallelism of the applicator roll and the back up roll 5. The spacing (f) between the roll barrel 62 for calibration and the back up roll 5 is then measured and the spacing values on both sides are compared. As a result, the parallelism of the applicator roll and the back up roll 5 is rapidly and easily investigated or calibrated with high accuracy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating film thickness control method for a roll coater using a belt-shaped body as an object to be coated and a coater roll parallelism calibration roll.

[0002]

2. Description of the Related Art Conventionally, as a coating technique using rolls, a system in which one or a plurality of rolls are combined is known. For example, in the method using a single roll, the coating material is supplied to the roll and transferred from the surface of the roll to the object to be coated. In this method, a predetermined coating film thickness can be obtained by adjusting the viscosity of the paint, the rotation speed of the roll, and the like. Further, in the method of combining a plurality of rolls, the paint film thickness on the roll surface can be sequentially changed by changing the paint viscosity, the rotation speed of the rolls, the gap between the combined rolls, the pressing pressure, etc. can get.

An example of a conventional roll coater device is shown in FIG. This is a V-shaped three-roll coater including three rolls of an applicator roll 1 made of rubber, a pickup roll 2 made of metal, and a doctor roll 3 made of rubber.

The backup roll 5 is attached to the foundation 7. The applicator roll 1 is attached to the screw 31 and is arranged so as to face the backup roll 5 with the article 4 to be coated therebetween. The screw 31 is rotated by the stepping motor 11 attached to the base 41, and moves the applicator roll 1 in the direction of approaching and separating from the backup roll 5. A torque sensor (for example, a load cell) 21 is mounted on the rotation shaft of the stepping motor 11, and a signal corresponding to the pressing pressure between the backup roll 5 and the applicator roll 1 is obtained from this.

The pickup roll 2 has a screw 32.
And is arranged so as to face the applicator roll 1. The screw 32 is rotated by the stepping motor 12 attached to the first pedestal 42 to move the pickup roll 2 in a direction of approaching and separating from the applicator roll 1. A torque sensor (for example, a load cell) 22 is mounted on the rotation shaft of the stepping motor 12, and from this, the applicator roll 1
A signal corresponding to the pressing pressure between the pickup roll 2 and the pickup roll 2 is obtained.

The doctor roll 3 is attached to the screw 33 and is arranged so as to face the pickup roll 2. The screw 33 is rotated by the stepping motor 13 attached to the second pedestal 43, and moves the doctor roll 3 in a direction of approaching and separating from the pickup roll 2. A torque sensor (for example, a load cell) 23 is mounted on the rotary shaft of the stepping motor 13, and a signal corresponding to the pressing pressure between the pickup roll 2 and the doctor roll 3 is obtained from this. In this way, the stepping motors 31, 32, 33 are driven so that the signals corresponding to the respective pressing pressures have predetermined values, and the predetermined pressing pressures are maintained. Such pressing pressure control generally has a control mechanism on each side of the roll.

[0007]

Under this structure, the rubber roll and the rigid (metal) roll are installed, but the parallelism between the backup roll 5 and the applicator roll 1 is generally Generally, a clearance gauge is inserted between both rolls for calibration, but since the clearance gauge easily deforms the surface layer of the rubber applicator roll 1, the parallelism is accurately calibrated. It was difficult. As a result, in controlling the pressing pressure of the applicator roll 1 against the backup roll 5, the parallelism is adjusted first, but it is difficult to adjust it with sufficient accuracy. Therefore, the applicator roll 1 is not parallel to the backup roll 5. I was forced to move forward in this state and enter the pressing pressure control. Therefore, even though the values of the torque sensor are apparently the same on both sides, since the applicator roll 1 is made of rubber, one pressure is applied. Sometimes indicates the pressing force applied to the "body 4 to be coated + backup roll 5", and the net pressure to the body 4 on both sides becomes uneven, leading to coating failure. In particular, when the plate thickness of the object to be coated 4 is thin, this phenomenon becomes remarkable, and for example, a large amount of paint is transferred to the backup roll 5 on one side, which is also a cause of line trouble.

The parallelism between the coater rolls is not as strictly required as the parallelism between the backup roll 5 and the applicator roll 1, but the phenomenon is the same.

Therefore, according to the present invention, even in the case of a rubber roll, the parallelism between the rolls and between the backup roll and the applicator roll is accurately calibrated as necessary, and both sides of the roll are moved in parallel to make both sides uniform. An object of the present invention is to provide a method for controlling a coating film thickness of a roll coater device capable of eliminating a single reduction even when the object to be coated has a small plate thickness, and a coater roll parallelism calibration roll used therefor.

[0010]

The present invention advantageously solves the problems of the prior art, and as a result of the inventors' earnest efforts to achieve the above object, a rubber roll In addition, the parallelism between the rolls and between the backup roll 5 and the applicator roll can be accurately calibrated as necessary to eliminate the one-sided reduction. The gist of the present invention is (1) In a coating film thickness control method using a roll coater device using one or more rubber coater rolls, a rigid roll is used instead of the rubber roll, and the parallelism of the coater roll is calibrated. Method for controlling coating film thickness of coater device (2) Use of a rigid roll having a convex structure larger than the thickness of the coating target plate at both ends of the roll outside the width of the coating target plate and inside the width of the coater roll. 1 in coating rolls calibration roll having a coating thickness control method (3) convex structures on the inner side of the roll ends from and coating rolls width outside the object to be coated body plate width of the roll coater apparatus according.

[0011]

The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a schematic diagram of an applicator roll according to the present invention during calibration. The rigid (Cr-plated iron roll) calibration roll is composed of a calibration roll body 61 and a calibration roll body 62, and the calibration roll body 62 is composed of “the maximum plate width a of the object to be coated a + the object to be coated 4”. The meandering allowance at the time of line passing of the painted body 4 ”
Two of them are arranged with a wider distance b. The outer diameter e of the calibration roll body 62 is "the maximum plate thickness c of the object to be coated c × 2.
The outer diameter d of the calibration roll main body 61 is larger than that of the calibration roll main body 61.

When it is necessary to investigate or calibrate the parallelism between the applicator roll 1 and the backup roll 5, the applicator roll 1 is removed from the coater while leaving the object 4 to be coated on the coating line, and instead, Attach the calibration roll. Without interfering with the body to be coated 4 outside the body to be coated 4, a clearance gauge is inserted between each of the calibrating roll body portions 62 and the backup roll 5 on both sides, and this gap f is measured to measure the gap f. By comparing the gap values, it became possible to investigate or calibrate the parallelism between the applicator roll 1 and the backup roll 5 with high accuracy very quickly and easily.

Also between the coater rolls, it is possible to investigate or calibrate the parallelism between the rolls with high accuracy by replacing the rubber roll with the above calibration roll. By using such a calibration roll, it becomes possible to control the coating film thickness with high accuracy.

[0014]

As described above, according to the present invention, even in the case of a rubber roll, the parallelism between the rolls and between the backup roll and the applicator roll can be maintained in a state where the object to be coated is left on the line. It is possible to easily and quickly measure or calibrate and eliminate the pressure reduction.

[Brief description of drawings]

FIG. 1 is a schematic view from above during calibration of an applicator roll according to the invention.

FIG. 2 is a schematic side view of a conventional roll coater device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Applicator roll 2 Pickup roll 3 Doctor roll 4 Object to be coated 5 Backup roll 6 Painting pan 7 Foundation 11 Stepping motor (for applicator roll) 12 Stepping motor (for pickup roll) 13 Stepping motor (for doctor roll) 21 Torque sensor (application) 22) Torque sensor (for pickup roll) 23 Torque sensor (for doctor roll) 31 Screw (for applicator roll) 32 Screw (for pickup roll) 33 Screw (for doctor roll) 41 Base 42 First pedestal 43 43 2 Cradle 51 Base forward / backward movement mechanism 61 Calibration roll main body 62 Calibration roll body a Maximum sheet width to be coated b Body distance (calibration roll) c Maximum sheet thickness to be coated d Outside calibration roll body Diameter e Calibration roll outer diameter f Clearance between backup roll and calibration roll body

Claims (3)

[Claims] 1. In a coating film thickness control method using a roll coater device using one or more rubber coater rolls, a rigid roll is used instead of the rubber roll to calibrate the parallelism of the coater roll. And a method for controlling a coating film thickness of a roll coater. 2. The coating of a roll coater device according to claim 1, wherein a rigid roll having a convex structure larger than the thickness of the coating plate is used at both ends of the roll outside the coating plate width and inside the coater roll width. Film thickness control method. 3. A coater roll parallelism calibrating roll having a convex structure larger than the thickness of the plate to be coated on both ends of the roll outside the width of the plate to be coated and inside the width of the coater roll.