JPH05200346A - Coating method and slit coater - Google Patents

Abstract

PURPOSE:To obtain an extrusion coating method and a slit coater where the freely setting of coating width corresponding to the width of material to be coated, the removal of excess coating or shortage of coating material from the coating end part and the meandering carrying of material to be coated are coped with. CONSTITUTION:A coating method where a notch part 6 which is wider than the slit width is installed at the front end of a slit coater 3 and a stopper 7 is inserted into the notch part from the right and left ends and the distance covered in stopper coming and going is controlled corresponding to the width of a material to be coated 1 to adjust the coated width is provided. And, the meandering carrying of the material to be coated 1 during carrying is detected by a sensor S arranged along a carrying route of the material 1 to be coated and according to the detected information, the whole slit coater 3 is moved parallel to coat the material to be coated to its whole width.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved coating method by an extrusion method using a slit coater, and a slit coater suitable for carrying out the coating method.

[0002]

BACKGROUND OF THE INVENTION In recent years, in the film / printing industry, coating by an extrusion method, which has a low liquid loss and enables high-speed coating, has become the mainstream. On the other hand, in order to meet the diverse needs of consumers, the size of the coated object is diverse.

Therefore, in coating by the extrusion method, when coating is performed on an object having a width narrower than the width of the slit coater (the discharge width of the coating liquid), it is backed up by the coating liquid discharged outside the width. Not only is the roller soiled, but it also adheres to the back side of the object to be coated and stains the surroundings. Therefore, some measure is required, but conventionally, a laborious method such as closing the ejection port of the nozzle portion with a thin tape or the like has been performed. Therefore, in Japanese Utility Model Laid-Open No. 1-88768 and Japanese Patent Application Laid-Open No. 2-214569, as shown in FIG. 3, a state in which a rod C serving as a stopper can be slid from both side surfaces at an intermediate position of a slit B in a slit coater A It is proposed that the discharge width of the coating liquid is regulated by inserting and removing by the rod C.

Further, Japanese Utility Model Laid-Open No. 1-120974 proposes to further proceed to detect the width of an object to be coated and to automatically control the amount of rod C going in and out correspondingly. There is no description about the meandering conveyance of the coating material.

[0005]

In coating by the extrusion method, an object to be coated may be conveyed in a meandering manner, and the back-up roll portion on which the coating is performed shifts in the left-right width direction. Not only does this result in wasteful discharge of the coating liquid on the side of, but also on the other side, defective products in which the coating is not performed appear along the edge of the object to be coated. Such defective products must be cut and removed, which is not preferable because it is not only complicated but also increases costs and wastes resources.

An object of the present invention is to clarify a coating method by an extrusion method using a slit coater which solves the above-mentioned conventional problems, and a slit coater suitable for carrying out the coating method.

[0007]

The above objects of the present invention are as follows:
A slit notch part wider than the slit width is provided at the front end of the slit coater, and stoppers are inserted into this part from the left and right ends,
A coating method characterized in that the coating width is adjusted by controlling the amount of movement of the stopper in correspondence with the width of the coating object, and the coating object being conveyed by a sensor arranged along the conveyance path of the coating object. An application method characterized by detecting the meandering conveyance of an object, translating the entire slit coater in parallel according to this detection information, and applying the coating to the entire width of the object being meandered and conveyed, or the slit width at the front end. A slit coater is provided that has a wider notch than that, inserts stoppers from the left and right ends into this part, and adjusts the coating width by controlling the amount of stopper movement in and out according to the width of the object to be coated. To be done.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The present invention will now be described in more detail with reference to the accompanying drawings. 1 and 2, reference numeral 1 denotes an object to be coated, which is guided and conveyed by the backup roller 2. 3 is a slit coater 3, and the coating liquid is
The liquid is supplied to the liquid supply pipe portion 4 in the central portion, is discharged from the tip portion through the slit 5, and the coating liquid bridge is formed between the cutout portion 6 and the coating object 1. Application to the surface is performed.

Reference numeral 7 denotes a stopper, which is inserted into the notch 6 from the left and right ends as shown in FIG. 2 (the upper half of the slit coater 3 is cut away and drawn) to be coated. The insertion amount is adjusted automatically or manually according to the width of the object 1. Stopper 7 is made of stainless steel
It is a hollow pipe made of a material such as Teflon / bancode.

The size of the stopper 7 is about ± 0.2 mm with respect to the width of the cutout portion 6, for example, about 2.9 m.
An outer diameter of m is used. The shape of the notch 6 is
It is formed symmetrically with the slit 5 in between.

A method of performing coating corresponding to the meandering conveyance of the object to be coated will be described. As shown in FIG. 2, the sensor S is arranged along the carrying path of the object to be coated 1 and it is detected whether the object 1 to be coated is correctly conveyed on the specified carrying path. As the sensor S, not only a sensor that uses light, an ultrasonic wave, or a wind, but also a mechanical sensor such as a tentacle that moves in contact with the end of the object to be coated 1 and moves in accordance with the lateral movement thereof can be used.

When the sensor S detects the meandering conveyance, in which the article 1 is conveyed while deviating from the prescribed conveyance path,
The motor M is driven according to the detection information, and the entire slit coater 3 is translated. In the coating section, it is required that the entire width of the object to be coated 1 and the coating liquid discharge width of the slit coater 3 correspond to each other. Therefore, if the slit coater 1 is moved when the meandering conveyance is detected, Since there is a gap between the meandering position and the coating position, which is not preferable, the sensor S is provided close to the coating position, or
The motor M is set by setting a time lag and further calculating the amount of conveyance displacement of the coating object from the meandering detection position to the coating position.
Is preferably controlled.

A stepping motor or the like can be preferably used as the motor M for moving the entire slit coater 1 in parallel, but the motor M is not limited to this. Further, as described above, in the aspect in which the sensor S comes into contact with the end portion of the coating object 1 being conveyed and moves left and right, the slit coater 3 is moved in accordance with the movement of the sensor S by a so-called tracing method. A mechanical structure such as moving it is also possible.

[0014]

According to the method of the present invention, the coating width can be freely set in accordance with the width of the object to be coated, and even when the object to be coated meanders and is conveyed, it meanders. By moving the slit coater according to the amount, it is possible to match the discharge position of the coating liquid on the coating object and the slit coater,
It is possible to always apply the entire width of the object to be coated, and there is an advantage that it is possible to avoid such a situation that the one end of the object is not coated and the other end is coated on the backup roller.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a coating section using a slit coater of the present invention.

FIG. 2 is a schematic plan view of the same.

FIG. 3 is a schematic sectional view of a conventional product.

[Explanation of symbols]

 1-Subject to be coated 2-Backup roller 3-Slit coater 4-Liquid supply pipe section 5-Slit 6-Notch section 7-Stopper A-Slit coater B-Slit C-Rod (stopper) M-Motor S-Sensor

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[Procedure amendment]

[Submission date] March 10, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

A stepping motor or the like can be preferably used as the motor M for moving the slit coater 3 in parallel, but the motor M is not limited to this. Further, as described above, in the aspect in which the sensor S comes into contact with the end portion of the object to be coated 1 being conveyed and moves left and right, the slit coater 3 is moved in accordance with the movement of the sensor S by a so-called tracing method. A mechanical structure such as moving can also be adopted.

Front page continued (72) Inventor Shigeru Kobayashi 1 Sakura-cho, Hino-shi, Tokyo Konica Co., Ltd. (72) Inventor Hiroshi Ezaki 14 Sunayama, Hasaki-cho, Kashima-gun, Ibaraki Mitsubishi Kasei Co., Ltd. (72) Invention Person Yasushi Nagae 14 Sunayama, Hasaki-cho, Kashima-gun, Ibaraki Prefecture Mitsubishi Kasei Co., Ltd. Kashima Plant

Claims (3)

[Claims] 1. A slit coater is provided with a notch portion wider than the slit width at the front end thereof, and stoppers are inserted into this portion from the left and right ends to control the amount of movement of the stopper in correspondence with the width of an object to be coated. A coating method characterized by adjusting a coating width. 2. A meandering conveyance of a coating object being conveyed is detected by a sensor arranged along a carrying path of the coating object, and the entire slit coater is moved in parallel in accordance with the detection information and is meanderingly conveyed. The coating method is characterized in that coating is performed on the entire width of the coated object. 3. A notch having a width wider than the slit width is provided at the front end, and stoppers are inserted into the notch from the left and right ends, and the amount of movement of the stopper is controlled according to the width of the object to be coated to adjust the coating width. A slit coater that has a configuration to be adjusted.