JPS6369573A - Coating method - Google Patents

Abstract

PURPOSE:To shorten the time for changing over and to improve working efficiency of a coating machine, by installing at least >=2 units of coating devices to one coating station and alternately using said devices. CONSTITUTION:At least >=2 units of the coating devices 8, 9 are installed in series in the longitudinal direction of a long-sized web 7 to one coating station 2 which makes a pair with a dryer 3. The respective coating devices are alternately used. As a result, the downtime of the coating machine body by changing over of coating liquids for production of diversified kinds in small lots is shortened to a greater extent and the working time of equipment is eventually increased. The reduced cost of the product is thus attained.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is a method for uniformly coating a part or the entire surface of a moving belt-shaped support (hereinafter referred to as a web) with a liquid coating composition to an appropriate thickness. This article relates to 9Js efficient coating method when a single coater is used to produce multiple products with extremely small lofts, or products manufactured by sequentially coating and drying two or more coating liquids. The present invention relates to an efficient coating method for the following cases.

[Conventional technology]

Conventionally, the structure of a coating machine for forming a coating layer on the surface of a continuously running web is as shown in FIG. The basic structure includes a coating device 11 in the coating station 2, a drying device (dryer) 3 for drying the coating liquid on the web, and a drive device (not shown) for running the web.In addition, the old coil and new coil are bonded together. It consists of a device, a web position correction device, a film thickness measuring device, a surface inspection device, a laminating device, etc.

In this case, since one coating device 11 is installed in one coating station 2 paired with one dryer 3, when it is necessary to change the coating liquid, part or all of the coating device 11 must be replaced. Or, with the applicator stopped,
I was cleaning and setting the conditions for the next coated product.

[Problem that the invention seeks to solve]

This method did not pose much of a problem when manufacturing the same product for a long time using one coating solution, but it is suitable for equipment for high-mix, low-volume production where small lots are frequently manufactured, or when two or more types of products are manufactured in small quantities. As production equipment for products manufactured by sequentially applying and drying a coating liquid, the operating rate of the coating machine itself has become low, which has become a major problem.

The present invention was made in view of the above-mentioned drawbacks of the prior art, and it minimizes the time required for frequent switching of coating liquids and coating conditions when manufacturing multi-product coated products with extremely small lofts using one coating device. The purpose of the present invention is to provide an efficient coating method for greatly increasing the operating time of a coating machine.

[Means for solving problems]

The present invention provides a continuous coating machine for long webs, in which at least two or more coating devices are installed in series in the longitudinal direction of the web in one coating station paired with a drying device, and each coating device is used alternately. This coating method is characterized by:

The coating device installed in the coating station in the present invention is a conventionally known reverse roll method, floating knife method, gravure method, doctor knife method, impregnation method, fountain method, vane method, extrusion method, and curtain method. , air doctor type, etc., and may be determined by taking into consideration conditions such as the physical properties of the coating liquid, the type of support, the amount of coating, and the required coating surface quality.

Furthermore, the two or more coating devices employed do not necessarily have to use the same coating method, and there is no problem even if different coating methods are selected.

[For production]

The present invention installs at least two or more coating devices in one coating station and uses them alternately.
The switching time can be significantly shortened and the operating rate of the coating machine can be greatly increased.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows one embodiment of the present invention, in which 1 is a web delivery device, 2 is a coating station, 3 is a dryer, 4 is a delivery device for lamination, 5 is a laminating device, and 6 is a coating device. This is a web winding device.

The coating station 2 is isolated from the outside air by a casing when dustproofing and prevention of diffusion of solvent gas in the case of an organic solvent coating liquid are required.

A web bath 7 is placed inside the casing of this application station 2.
Coating devices No. 8 and No. 9 are installed in series. The coating method in this coating device is the Clavier method in both cases 8 and 9, and coating liquid B is applied first in the coating device 8. During this time, the coating device 9 completely cleans the collavia roll, blade, and liquid pan to which the previously applied coating liquid A has adhered, and sends the next coating liquid C to the liquid feeding device and liquid pan, as well as the necessary Finish setting the coating conditions. Then, when it is time to change the applied product, see (1) in the diagram.
By switching from the web bus shown in Figure 1 to the web bus shown in (II) in the figure, switching to the next product is performed.

Similarly, when switching to the next product, use the coating device No. 9 while coating.
Make sure to finish cleaning the coating device and setting conditions in step 8. By alternately using two coating devices as described above, it is possible to greatly reduce the work and time required to stop the conventional coating machines and switch coating liquids (products).

Furthermore, in this embodiment, there are restrictions on the angle and direction of the entrance and exit webs, so changing the bus was necessary; however, if there are no such restrictions, changing the bus may not be necessary. At this time, the changeover time is almost zero by simply changing the Tarabier roll, blade, and liquid pan.

Although this web bath example was related to the gravure coating method, it goes without saying that the web bath will change depending on the selected coating method, and the optimal path for each coating method will be examined each time. There is a need.

〔Effect of the invention〕

As is clear from the above, according to the present invention, it is possible to significantly shorten the stop time of the coating machine body due to coating liquid change in high-mix, small-lot products, which leads to an increase in equipment operating time, thereby increasing productivity. The effect of reducing product costs due to this increase is significant. Especially organic solvent-based multi-I, which is difficult to apply simultaneously in multiple layers.
In the field of ii coating, the benefits are great.

On the other hand, when continuous coating is performed for a long period of time, intermediate cleaning etc. can be carried out efficiently, contributing to improved coating quality. Furthermore, if it is necessary to apply a variety of coating liquids with a wide range of physical properties to fluorine, it is possible to increase the functionality of the applicator itself by installing multiple devices with different coating methods, rather than devices with the same coating method. You can upload it to the width.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a coating machine showing one embodiment of the coating method of the present invention, and FIG. 2 is a schematic diagram showing the configuration of a conventional coating machine. 1... Sending device 2... Coating station 3... Dryer 4... Sending device 5... Laminating device 6... Winding device 7... Web 8... Coating device (I) 9... Coating device rIl (ff)

Claims (1)

[Claims] (1) In a continuous coating machine for long webs, at least two or more coating devices are installed in series in the longitudinal direction of the web in one coating station paired with a drying device, and each coating device is used alternately. A coating method characterized by: