JPH11207232A - Coating method and device - Google Patents

Abstract

(57) [Problem] To prevent a curtain film of a coating liquid from being cut by a paper splicing portion and being repelled backward. SOLUTION: A paper spliced portion detection sensor 11 is provided upstream of a coating position A where a coating liquid 4 flows from a liquid supply head 3 onto the surface of a base paper 2. A colored tape 12 is attached to the paper splicing portion 6, and the colored tape 12 is detected by the detection sensor 11. From the distance S from the position of the spliced portion detection sensor 11 to the coating position A and the speed V of the paper, the time from when the spliced portion 6 is detected to when it reaches the coating position A is calculated by the arithmetic unit 15. calculate. Splice detection sensor 1
1 detects the spliced portion 6, the shutter pan 5 is advanced after the calculated time, and the spliced portion 6 is moved to the coating position A.
The coating is interrupted while passing through.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for applying a coating solution to base paper produced in a paper mill, and more particularly to a method and apparatus for applying a coating liquid when a paper joint passes a coating position. The present invention relates to a coating method and an apparatus for interrupting.

[0002]

2. Description of the Related Art Paper manufactured in a paper mill is not used immediately as it is, but is used as a base paper for further processing to obtain a processed paper as a product meeting a required purpose. There are many. There are various types of processed paper, and one of them is coated paper. Coated paper is manufactured by applying a coating liquid to the paper surface for the purpose of improving the properties of the paper surface.

[0003] On the other hand, paper manufactured in a paper mill is once wound on a take-up reel and formed into a roll. Conventionally, coating is performed after forming a large-diameter roll.

For this reason, when the diameter of the wound roll is small, the ends of the paper of each roll are added to form a large-diameter roll.

[0005] There are various types of coating apparatuses for producing the above-mentioned coated paper, and one of them is, as schematically shown in FIG. A liquid supply head 3 is disposed at a position above the base paper 2 in a direction perpendicular to the pass line of the base paper 2 as a length corresponding to the width of the base paper 2, and flows down from the liquid supply head 3 in a curtain shape. There is a curtain coater type coating apparatus for uniformly applying the coating liquid 4 to be applied to the surface of the base paper 2.

In such a curtain coater type coating apparatus, the coating liquid 4 is supplied onto the base paper 2 (0N) and stopped (0FF) at a position between the liquid supply head 3 and the base paper 2. Shutter pan 5 is provided so as to be movable in the front-rear direction along the pass line of the base paper 2.
And an OFF operation for moving the shutter pan 5 forward to block the flowing-down position of the coating liquid 4 by using a drive device (not shown). The supply and stop of the coating liquid 4 to the base paper 2 are performed.

[0007]

However, in the coating operation of applying the coating liquid 4 to the surface of the base paper 2 with the above-described coating apparatus of the curtain coater type, the rear end and the front end of the base paper 2 are separated as shown in FIG. If there is a spliced portion 6 which is a connected portion, the spliced portion 6 becomes thicker than the steady portion, and a step 6a occurs in the spliced portion 6, so that the spliced portion 6 is coated at the coating position A, That is, when the coating liquid 4 passes through the falling position of the coating liquid 4 at high speed, the curtain film by the coating liquid 4 is cut off by the collision with the step 6a of the paper splicing portion 6 and is repelled backward. There is a problem that a thick coating portion is formed, the drying becomes difficult, and the roll surface on the downstream side is soiled.

Therefore, the present invention provides a method in which the coating operation is stopped while the paper splicing portion passes the coating position, and the coating operation is performed when the paper splicing portion passes the coating position. It is an object of the present invention to provide a coating method and an apparatus for preventing a curtain film of a coating liquid from being cut and repelled backward at a paper splicing portion.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a coating method in which a coating liquid is caused to flow down from a liquid supply head in a curtain shape so as to be applied to the surface of a running base paper. A coating method characterized by detecting the paper spliced portion on the upstream side of the coating position and interrupting the coating while the paper spliced portion passes the coating position by the detection signal, Further, the coating liquid is caused to flow down in a curtain form from the liquid supply head to be applied to the surface of the running base paper, and the supply and stop of the coating liquid to the base paper surface are performed between the liquid supply head and the base paper. In the coating apparatus, which is performed by moving the shutter pan or moving the liquid supply head, a paper spliced portion detection is performed to detect a paper spliced portion at a position upstream of a coating position at which the coating liquid flows down to the base paper surface. A sensor is installed, and the paper joint detecting sensor is provided. A computing unit for calculating a time from the position where the spliced portion is detected by the detection signal from the position to reach the coating position, and further, the spliced portion determines the coating position based on the time calculated by the computing device. During the passage, the shutter pan or the liquid supply head is moved to interrupt the coating.

When the spliced portion is detected by the detection sensor on the upstream side of the coating position, the time from the detected position until the spliced portion reaches the coating position is determined. By blocking the flow of the coating liquid,
Since the coating is interrupted while the spliced portion passes through the coating position, the coating liquid is not applied to the spliced portion. This prevents the curtain film of the coating liquid from being cut at the step of the paper spliced portion and being repelled backward, thereby preventing local thick coating from occurring.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. As shown in FIG. 3, it is made to flow down from a liquid supply head 3 onto the surface of a base paper 2 wound around a coater roll 1 and run. While applying the coating liquid 4,
The shutter pan 5 is moved in the front-back direction to
N, OFF operation is performed, and further, a coater roll 7 and guide rolls 8 and 9 are arranged upstream of the coater roll 1 so that the base paper 2 can be guided to the coating position A. The air chamber 10 is located downstream of the position A.
Is installed, and the tension is applied to the coated paper in a non-contact manner by the air blown out from the air chamber 10.
A paper splicing part detection sensor 11 is installed, and the rear end of the preceding base paper 2 and the leading end of the succeeding raw paper 2 are overlapped and bonded with an adhesive to form a color on the inner side of the paper splicing part 6. The attached tape 12 is attached, and the paper spliced portion detection sensor 11 detects from the start to the end of the passage of the colored tape 12.

A driving device 13 for moving the shutter pan 5 in the front-rear direction and a controller 1 for instructing the driving device 13 to be driven after a predetermined time.
4 is provided.

Further, a detection signal from the spliced portion detection sensor 11 is input, and the distance S from the position of the spliced portion detection sensor 11 to the coating position A and the traveling speed V of the base paper 2 are used to determine the paper size. The time t required from the detection of the joint portion 6 by the detection sensor 11 to the arrival at the coating position A is represented by t = S
/ V, and a controller is provided in accordance with the arrival time t to the coating position A corresponding to the width from the start to the end of the spliced portion 6 determined by the arithmetic unit 15. An operation command is sent from 14 to the driving device 13, and the shutter pan 5 is automatically moved to perform the OFF operation and the ON operation.

Now, as shown in FIG. 1, the spliced portion 6 comes to the position of the spliced portion detecting sensor 11, and the colored tape 12 attached to the spliced portion 6 is detected by the spliced portion detecting sensor 11. Then, the detection signal is input to the arithmetic unit 15.

Since the low speed V and the distance S from the spliced portion detection sensor 11 to the coating position A are input to the arithmetic unit 15 in advance, the arithmetic operation is immediately performed when the detection signal is input. The time from when the spliced portion 6 is detected to when the spliced portion 6 reaches the coating position A is determined, and a command is issued to the controller 14, and the driving device 13 is further adjusted from the controller 14 so that the spliced portion 6 is coated. While passing through the position A, the shutter pan 5 is moved forward, and the coating operation can be interrupted by an OFF operation that blocks the flowing position of the coating liquid 4. This prevents the curtain film of the coating liquid 4 from being cut off by the collision between the step 6a of the paper splicing section 6 and the coating liquid 4 when the paper joining section 6 passes the coating position A, thereby preventing the coating film 4 from being repelled backward. That is, the formation of a thick coating portion is avoided.

When the paper splicing section 6 has finished passing the coating position A, the shutter pan 5 is retracted and turned ON with the passage of the time calculated by the calculator 15, and the coating is started again. The supply of the coating liquid 4 to the paper surface is performed.

Next, FIG. 2 shows another embodiment of the present invention, in which the shutter pan 5 in the above-described embodiment is moved in the front-back direction to supply the coating liquid 4 to the surface of the base paper 2. Instead of the stop, the liquid supply head 3 is moved back and forth to turn on and off the coating. The liquid supply head 3 is moved rearward to receive the coating liquid 4 by the color pan 16 so as to interrupt the flow down to the surface of the base paper 2. The other configuration is the same as that shown in FIG. 1, and by detecting the colored tape 12 with the paper splicing part detection sensor 11, the paper splicing part 6 moves to the coating position A after passing the detection sensor 11 position. An arithmetic unit 15 for calculating the time required to reach the position is provided, and an operation command is issued from the arithmetic unit 15 to a driving device 17 for moving the liquid supply head 3 via a controller 18.

Also in this embodiment, the spliced portion 6 passes the position of the spliced portion detecting sensor 11 and the sensor 11 detects the colored tape 12 affixed to the spliced portion 6. The time required for the position to reach the coating position A is determined from the paper speed V and the distance S from the spliced portion detection sensor 11 to the coating position A, as in the case described above. A backward movement command is issued to the driving device 17 of the head 3, and the coating can be interrupted while the paper splicing section 6 passes the coating position A.

The present invention is not limited to the configuration of the embodiment shown in FIGS. 1 and 2. For example, if the spliced portion detection sensor 11 is on the upstream side of the coating position A, Of course, and various changes can be made without departing from the spirit of the present invention.

[0021]

As described above, according to the coating method and apparatus of the present invention, a coating method and apparatus of a curtain coater type in which a coating liquid is caused to flow down in a curtain form from a liquid supply head and applied to the surface of a base paper. In, the coating is interrupted while the paper splicing portion passes the coating position, and the coating interruption is performed based on the detection signal from the paper splicing portion detection sensor installed on the upstream side of the coating position. The time required for the spliced part to reach the coating position is obtained by a computing unit, and the movement is performed by moving the shutter pan or the liquid supply head in accordance with this time. The paper spliced part having a step does not cut the curtain film of the coating liquid and flips backward, avoids the thick coating part, and eliminates the problem that it becomes difficult to dry. Insufficient drying rolls It is possible to eliminate a problem that soil the roll adhere to the roll when excessive, an excellent effect like.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing another embodiment of the present invention.

FIG. 3 is a schematic view showing a coating apparatus of a curtain coater type.

FIG. 4 is a perspective view of the paper showing a paper splicing portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coater roll 2 Base paper 3 Liquid supply head 4 Coating liquid 5 Shutter pan 6 Paper splicing part 11 Paper splicing part detection sensor 12 Colored tape 13 Drive unit 15 Computing unit 17 Drive unit

Claims (3)

[Claims] In a coating method in which a coating liquid is caused to flow down from a liquid supply head in a curtain shape so as to be applied to the surface of a running base paper, a paper spliced portion is detected upstream of a coating position to detect the spliced portion. A coating method, wherein the coating is interrupted while the paper spliced portion passes the coating position by a detection signal. 2. A method of causing a coating liquid to flow down in a curtain form from a liquid supply head so as to be applied to the surface of a running base paper, and the supply and stop of the coating liquid to the surface of the base paper are performed by the liquid supply head and the base paper. In the coating apparatus, which is performed by moving the shutter pan or moving the liquid supply head between the paper sheet and the paper for detecting the paper splicing portion, at a position upstream of the coating position at which the coating liquid flows down to the base paper surface. A splicing part detection sensor is provided, and a computing unit is provided for calculating a time from a position where the splicing part is detected to a coating position based on a detection signal from the paper splicing part detection sensor. A coating device that moves the shutter pan or the liquid supply head to interrupt the coating while the paper splicing section passes the coating position based on the time calculated by the container. 3. The coating apparatus according to claim 2, wherein a colored tape is attached to the spliced portion, and the colored tape is detected by a spliced portion detection sensor.