JP3927021B2 - Method and apparatus for preventing roll contamination in blade coating machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for preventing roll stains in a blade coating machine, and more particularly to prevent roll stains in the web ears that occur immediately after coating by a blade coating machine, and to achieve good coating. The present invention relates to a method and apparatus for preventing roll contamination in a blade coating machine capable of producing coated paper stably depending on the working state.
[0002]
[Prior art]
Conventionally, when applying a coating liquid onto a web using a blade coating machine, the web edge at the blade coating machine exit is around the liquid of the coating liquid due to the difference in coating amount from the center of the web. In many cases, liquid phlegm is generated at the web ear of the backing roll. Once liquid dregs occur in the web ears, the quality of the coated paper is degraded, such as coating unevenness and peeling. Conventionally, in order to prevent contamination of the web ear, a rubber plate or the like is applied to the web ear on the roll at the blade coating machine outlet.
[0003]
A conventional method for preventing roll contamination of the web ear will be described with reference to the drawings. FIG. 3 is a schematic perspective view showing a conventional blade coating machine. In FIG. 3, the blade coating machine includes a coater head 17, a coater blade 18, and a backing roll 19. The web 20 is coated with a coating liquid (not shown) by the coater head 17, and the coating liquid is scraped off by the coater blade 18 so as to reach a predetermined coating amount and travels to the dryer part 22. The Here, since both ends of the web, that is, the web ears, the coating liquid may wrap around the back surface of the web, the liquid around the edge end surface of the web immediately after coating. As a means for adjusting this, a rubber plate is provided in contact with the edge of the web of the backing roll for scoring.
[0004]
However, in the application to the web using the blade coating machine, since various conditions such as the web coating width, the coating amount, the coating speed, the unevenness in the width direction of the water content of the web are different, The means such as a fixed rubber plate could not be finely adjusted according to the coating conditions, and there was still room for improvement.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a blade coating machine capable of preventing roll soiling of a web ear portion that occurs immediately after coating by a blade coating machine and stably producing coated paper in a good coating state. A method and apparatus for preventing roll contamination are provided.
[0006]
[Means for Solving the Problems]
As a result of intensive studies in view of the above, the present inventors have invented a method and apparatus for preventing roll contamination in the blade coating machine of the present invention.
[0007]
That is, the method preventing roll staining in the blade coater of the present invention is mounted near the upstream side of the coater head, in conjunction with the light reflection type position sensor for sensing the ear end portion of the web across, the coated surface of the web the edge shower apparatus shower nozzle two respective performing edge shower side end portions is attached, the ear end by injecting water or steam and is wetted to be coated portion of said web end portion side, It is characterized by controlling the adhesion of the excessive coating liquid and preventing roll contamination generated by the ears at both ends of the web.
[0008]
Also, prevention device of roll staining in the blade coater of the invention, near the upstream side of the coater head, each two edges shower shower nozzle is attached to apply an edge shower onto the coated surface side end portions of the web Device, drive device comprising a drive motor, drive gear, and drive chain for driving the edge shower device so as to be movable in parallel with respect to the web width direction , a web ear connected to the edge shower device via a sensor support A light-reflective position sensor that senses the end portion is provided to prevent roll contamination caused by the ears at both ends of the web.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the method and apparatus for preventing roll contamination in the blade coating machine of the present invention will be described in detail.
[0010]
In the present invention, when a coating liquid is applied to a web using a blade coating machine, a difference in the coating amount occurs between the web ear portion immediately after coating and the web center portion. The present invention solves this problem by causing the roll surface to become soiled with liquid soot and invents a method and apparatus for preventing the web ear from being soiled.
[0011]
First, an apparatus for preventing roll contamination in the blade coating machine of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 is a schematic perspective view showing a blade coating machine provided with an edge shower device for preventing roll soiling of a web ear in the present invention. 1, the blade coating machine according to the present invention includes an edge shower device 1, a coater head 5, a coater blade 6, a backing roll 2, a drive device 8, and a light reflection type position sensor 9. The web 3 is coated with a coating liquid (not shown) by the coater head 5, and the coating liquid is scraped off by the coater blade 6 so as to reach a predetermined coating amount, and travels to the dryer part 7. The In this invention, the edge shower apparatus 1 of the web ear | edge part 4 is provided in the position in the vicinity of the backing roll 2 just before coating, two each for the web ear | edge part 4 of the same surface as the coating surface of the web 3. Yes. With the edge shower device 1 of the web ear 4, the web ear 4 can be brought into a wet state immediately before coating, and the difference in coating amount between the coated portion and the ear can be adjusted. As a result, in the blade coating, even if various conditions such as web coating width, coating amount, coating speed, and unevenness in the width direction of the water content of the web are different, a liquid circulation phenomenon of the web ear occurs. The coated paper can be produced stably without any problems.
[0013]
Moreover, the edge shower apparatus of the web ear | edge part of this invention is demonstrated in FIG.
[0014]
FIG. 2 is a schematic view showing an edge shower device for preventing roll contamination of the web ear portion in the present invention. In FIG. 2, the edge shower device for a web ear of the present invention comprises a light reflection type position sensor 10, a sensor support 15, a drive gear 12, a drive chain 13, and a drive motor 14.
[0015]
The light reflection type position sensor 10 provided on the sensor support 15 captures the web ear by the light reflection method. The edge shower apparatus is interlocked with the light reflection type position sensor 10, automatically injected water or water vapor from the nozzle section is adjusted to strike the web ears.
[0016]
In FIG. 2, the support that supports the edge shower device is the same frame as the sensor support 15 that supports the light reflection type position sensor 10, and the sensor 10 operates at the start of coating, and edge showers are provided at both ends of the web. Has the effect of placing the device.
[0017]
In the present invention, as an edge shower apparatus is preferably, for example, a material having durability, such as stainless steel, may be about 0.01P a as shower pressure. The width of the shower corresponds to the web ear, and may be adopted according to the operating conditions as appropriate.
[0018]
In the method for preventing roll contamination in the blade coating machine of the present invention, when water is sprayed from the edge shower device, heat generation of the backing roll can be suppressed, which is effective in addition to roll contamination.
[0019]
【The invention's effect】
As described above, the method and apparatus for preventing roll stains in the blade coating machine of the present invention prevent roll stains on the web ears that occur immediately after coating by the blade coating machine, and are stable due to good coating conditions. it is possible to produce a coated paper Te.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing a blade coating machine provided with an edge shower device for preventing roll soiling of a web ear in the present invention.
FIG. 2 is a schematic view showing an edge shower device for preventing roll soiling of a web ear portion according to the present invention.
FIG. 3 is a schematic perspective view showing a conventional blade coating machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Edge shower apparatus 2, 19 Backing roll 3, 20 Web 4, 21 Web ear | edge part 5, 17 Coater head 6, 18 Coater blade 7, 22 Dryer part 8 Driving device 9, 10 Light reflection type position sensor 11 Shower nozzle 12 drive Gear 13 Drive chain 14 Drive motor 15 Sensor support 16 Water or water vapor introduction pipe

Claims (2)

In the method of preventing roll dirt in the blade coating machine, it is attached in the vicinity of the upstream side of the coater head and interlocks with the light reflection type position sensor that senses the edge ends of both ends of the web , and edges at both ends of the coated surface side of the web the edge shower system mounted are two shower nozzles respectively subjected to shower, the ear end by injecting water or steam and is wetted to be coated portion of said web end portion side, excess coating solution A method for preventing roll contamination in a blade coating machine, characterized in that adhesion is controlled and roll contamination generated by the ears at both ends of the web is prevented. In prevention device of roll staining in the blade coater, near the upstream side of the coater head, edge shower apparatus two shower nozzles each of which is attached to apply an edge shower onto the coated surface side end portions of the web, the web width direction A drive motor that drives the edge shower device so as to be parallel to the drive device, a drive gear, and a drive chain comprising a drive chain; and a web ear end that is connected to the edge shower device via a sensor support. An apparatus for preventing roll contamination in a blade coating machine, comprising a light reflection type position sensor, and preventing roll contamination generated by ears at both ends of a web.

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