JPH0398671A - Coating apparatus - Google Patents

Abstract

PURPOSE:To control the coating thickness on a strip like material with high accuracy by providing a peripheral groove to a backup roll to divide said roll into a measuring part and a coating part in the axial direction thereof and providing a distance measuring sensor at the position of the control body opposed to said measuring part. CONSTITUTION:A backup roll 12 and the control body 26 for controlling coating thickness such as a roll or a knife arranged in the vicinity of the roll 12 are mounted and the coating thickness of a coating solution to a strip like article such as a film is controlled by the interval between the roll 12 and the control body 26. By providing a peripheral groove 14 to the roll 12, the roll 12 is divided into a measuring part 12a and a coating part 12b in its axial direction and a distance measuring sensor 28 is provided at the position of the control body 26 opposed to the measuring part 12a. As a result, the coating thickness to the strip like article can easily be controlled with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coating device for coating a strip-shaped object such as a film with a coating liquid.

[Prior Art and Problems to be Solved by the Invention] In the above-mentioned coating device, the coating thickness on the strip is determined by a backup roll for feeding the strip and a roller placed near the backup roll. This is the distance between the knife or roll.

Conventionally, there are the following two methods for measuring this distance.

(2) There is a method of installing a sensor between the backup jaw and the knife to determine the distance.

Although this method allows highly accurate measurement, there is a problem in that the coating liquid travels around the backup roll and adheres to the sensor, making measurement difficult.

■ Center on the adjustment device that measures the position of the support supporting the knife, and imagine a circle with a radius between this center point and the tip of the knife.

Then, install a distance sensor at the same position as this radius,
There is a way to measure the distance from the backup role.

With this method, it is very troublesome to determine the interval aPJ,
It was difficult to finely adjust the spacing.

In addition, the accuracy is poor and the difference between the actual value and the displayed value is 4μm to 5μm.
There is often a difference with m. In particular, changes in the actual value due to thermal expansion of the backup roll do not appear in the displayed value.

[Object of the Invention] The present invention provides a coating device that can easily and accurately adjust the coating thickness on a strip-shaped object.

[Means for Solving the Problems] The coating device of the present invention includes a roll and an adjusting body such as a roll or a knife arranged near the roll for adjusting the coating thickness. In a coating device that adjusts the coating thickness of a coating liquid on a strip-shaped object such as a film by adjusting the distance between a roll and an adjustment body, by providing a peripheral structure on the roll, the roll is axially moved into a 71P1 constant portion. The roller is divided into a coating section and a distance measuring sensor is provided at a position of an adjusting body facing the measuring section of the roll.

[Function] In the coating apparatus having the above configuration, in order to measure the distance between the roll and the adjusting body, the distance between the measuring part of the roll and the adjusting body is measured by a sensor.

Further, the coating liquid does not flow from the coating section to the measurement section due to the surrounding structure.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

(lO> is a nozzle type coating device.

(l2) is a backup roll for transporting a strip (P) such as a film, and both sides of this backup roll are rotatably supported by a frame. Also,
Surrounding structures (14) (14) are provided near both sides of the backup roll (12), and the backup roll (12) is connected to measuring parts (12a) (12a) on both sides.
) and a painted part (L2b) in the center.

(l6) is a nozzle for discharging the coating liquid and is arranged below the backup roll (l2>.
The discharge port (22) of B> is the backup roll (l2>
The width of the discharge port (22) is equal to that of the coating portion (12b). This nozzle (l6)
has a coating liquid reservoir part (18
> and a vibrator (20) to this coating liquid reservoir (l8).
The coating liquid is pumped from a bomb (not shown) through the cylinder. The coating liquid reservoir (l8) and the discharge port (22) are connected to the passageway (2).
4), and the coating branch fed under pressure to the coating liquid reservoir (l8) is connected to the strip material (F
) is applied.

(26) is a support part that supports the nozzle (l6>),
A nozzle (l6) is inserted between a pair of support parts (2B) (2B)
has been erected. The distance between the nozzle (i6) and the backup roll (l2) can be adjusted by moving the support part (l6) up and down.

(28) is a distance sensor, and the backup roll (
12) 71111 constant part (L2a) and the supporting part (
26). This sensor (28) is provided near the top of the nozzle (l6) and on the same line,
711+1 constant part (12a) measured by this sensor
The distance between the nozzle (l6) and the backup roll (l2>) is the distance between the nozzle (l6) and the backup roll (l2>).This distance measurement is also performed while the backup roll (12>) is rotating.
The distance sensor (28>) is preferably of a non-contact type, such as a distance sensor that uses a thin current.

The operation of the coating apparatus (IO) having the above configuration will be explained below.

First, the distance between the backup roll (l2) and the nozzle (l8) is measured by the distance sensor (28) and set to a desired distance.

Next, the belt-shaped body (F) is conveyed by the backup roll (12), and the coating liquid is ejected from the discharge port (22) of the nozzle (16) to start coating. In this case, the coating liquid flows along the circumference of the backup roll (12), but there is a circumferential groove (
14), the coating liquid flows into this circumferential groove (l4).
), the water does not flow to the full constant part (12a). Therefore, the coating liquid does not adhere to the distance sensor (28), and the sensor function can always be maintained.

In the above embodiment, in order to measure the distance between the nozzle (l6) and the backup roll (l2>), a circumferential groove (14) is provided in the bank up roll (12), and a distance sensor (2) is provided in the bank up roll (12).
8) is provided in the nozzle (l6), but this is not limited to this, and in coating equipment such as a three-roll funnel that adjusts the coating thickness with a pair of rolls, a peripheral roller is provided on the roll that adjusts the coating thickness. By providing a distance sensor and a distance sensor, precise measurements can be made without the coating liquid adhering to the distance sensor.

[Effects of the Invention] With the coating apparatus of the present invention, the coating liquid in the coating section does not flow to the δp1 constant part due to the surrounding structure, so the coating liquid does not adhere to the sensor and the roll is always connected to the sensor. The distance to the adjustment body can be accurately measured.

Figure 2 is. , also a side view, FIG. 3 is a longitudinal sectional view of the nozzle.

[Explanation of symbols] 10...Coating device 12...Backup roll １４・・・・・・Surroundings 16...Nozzle 28... Distance sensor

Claims (1)

[Claims] 1. It has a roll and an adjusting body such as a roll or a knife arranged near the roll for adjusting the coating thickness, and depending on the distance between the roll and the adjusting body, In a coating device that adjusts the coating thickness of a coating liquid on a strip-shaped object such as a film, the roll is divided into a measurement section and a coating section in the axial direction by providing a peripheral structure on the roll, and the roll is divided into a measuring section and a coating section. A coating device characterized in that a sensor for distance measurement is provided at a position of an adjusting body opposite to a measuring section.