JP2861173B2 - Blade coater - Google Patents

Description

The present invention relates to a blade coater provided in a papermaking machine.

[Prior Art] FIG. 5 shows an example of a conventional blade coater.
A fountain 4 type as shown or a roll type (not shown) is provided at a position below the backing roll 2 in the paper 3 which is guided from the guide roller 1 along the lower outer peripheral surface of the backing roll 2 in the direction of the arrow. The coating liquid 6 is applied to the lower surface of the paper 3 by the applicator 5, and then the coating liquid 6 applied to the paper 3 is surplus by a blade 7 provided on the downstream side of the applicator 5 so that the coating liquid 6 has a constant thickness. I try to scrape off the minute.

When the blade coater is operated when the papermaking machine is started or when the coating liquid is changed during operation, first, the blade 7 is brought into a state where a required pressure is pressed against the paper 3 being conveyed. The coating liquid 6 is applied to the paper 3 by the applicator 5.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional blade coater, when the operation of the blade coater is started, the coating liquid is applied by the applicator 5 after the blade 7 is pressed against the paper 3 which is continuously conveyed. Since there is a required time until the coating liquid 6 is applied to the paper 3, the blade 7 is rubbed by the paper 3 before applying the coating liquid.

In the case of an off-machine in which the paper machine and the blade coater are separated, the speed of the paper 3 can be adjusted, so there are relatively few problems. In order to press the blade 7 to a place where it is conveyed at a high speed of about 1300 m / min, even if it is for a short time, the most important touch surface of the blade 7 is worn, and thus the coating quality is deteriorated, or Problems, such as shortening the life of the device.

[Means for Solving the Problems] The present invention provides a blade coater that includes an applicator and a blade and applies a fixed amount of a coating solution to the side of the backing roll of paper along the backing roll. The present invention relates to a blade coater, which is provided with a lubricant application device for applying a lubricant to the side of the paper opposite to the backing roll on the upstream side in the transport direction.

[Operation] During the operation of the blade coater, immediately before pressing the blade against the paper, the operation of applying the synovial fluid to the paper by the synovial fluid application device is started. Then, since the blade comes into contact with the synovial fluid without directly contacting the paper, the sliding of the lubricant prevents the blade from being worn.

The application of the synovial fluid is performed to a position where the application of the coating fluid is started by the applicator and stopped.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In FIG. 1, portions denoted by the same reference numerals as those in FIG. 5 represent the same components.

The present invention is provided with a lubricant application device for applying the lubricant over the entire width of the paper, on the upstream side in the paper transport direction with respect to the blade. FIG. 1 shows the further upstream of the applicator 5. On the same side as the applicator 5 for the paper 3 on the side
A fanouten type application unit 9 for applying the synovial fluid 8 to the paper 3,
Measuring roller 10 for measuring the synovial fluid 8 applied in the applying section 9
And a synovial fluid application device 11 having the following.

As the synovial fluid 8, a material that prevents the blade 7 from directly contacting the paper 3 to give a slip, and that has good drying and does not adversely affect the paper such as discoloration and thickness change, such as water is used.

Immediately before the blade 7 is pressed against the paper 3, the lubricant application device 11 is operated to apply the lubricant 8 over the entire width of the paper 3, and further, immediately before the application of the coating fluid 6 by the applicator 5. 8 is stopped.

As described above, when the blade 7 is pressed against the paper 3,
Is already coated with the synovial fluid 8, the blade 7 is prevented from directly contacting the paper 3 by the synovial fluid 8, and thus the blade 7 is prevented from being worn by the paper 3.

It is preferable that the application amount of the synovial fluid 8 is a minimum amount that can suppress a decrease in the strength of the paper 3 and prevent abrasion of the blade 7.

When the application liquid 6 is applied by the applicator 5, the application of the synovial liquid 8 has been stopped, so that the normal application work can be continued stably thereafter.

In the above, when the blade 7 is pressed against the paper 3, it is necessary that the lubricating liquid 8 is already adhered to the paper 3, and when the coating liquid 6 is applied by the applicator 5, It is most preferable that the coating liquid 6 is applied instead of being replaced. However, even if the application of the synovial liquid 8 and the coating liquid 6 slightly overlaps with each other, since this part cannot be a product from the beginning, It doesn't matter.

FIG. 2 shows another example of the synovial fluid applying device 11, in which the synovial fluid 8 supplied under pressure is sprayed uniformly through the adjusting valve 12 over the entire width of the paper 3. The configuration is provided with a nozzle 13, and the rest is the same as in the case of FIG.

FIG. 3 shows a case where the synovial fluid application device 11 is arranged between the applicator 5 and the blade 7, and in this case, the synovial fluid application device 11 has the same structure as the application unit 9 shown in FIG. Either a method including the measuring roller 10 or a method including the spray nozzle 13 shown in FIG. 2 may be employed.

In the case of FIG. 3 described above, it is necessary to apply the lubricant 8 to the paper 3 immediately before the blade 7 is pressed against the paper 3 and to apply the lubricant 8 immediately before the application of the coating liquid 6 by the applicator 5. .

FIG. 4 shows a case in which a roll 14 type is adopted as the applicator 5. In this case, the synovial fluid application device 11 is also provided with the application unit 9 and the measuring roller 10 or the spray nozzle 13. Any of the provided methods may be used, and the installation position may be either upstream of the applicator 5 or between the applicator 5 and the blade 7.

The above-mentioned synovial fluid application device 11 may be fixed or may be configured to be able to approach and separate from the paper 3.

Incidentally, the blade coater of the present invention is not limited to the coating method of the synovial fluid coating device and the coating method of the coating liquid of the applicator, and it is needless to say that various changes can be made without departing from the gist of the present invention. It is.

[Effects of the Invention] As described above, according to the blade coater of the present invention, when operating the blade coater, the lubricant can be applied to the paper by the lubricant application device immediately before pressing the blade against the paper. Further, it is possible to prevent the blade from coming into direct contact with the paper, thereby preventing the blade from being worn by the sliding effect of the synovial fluid, thereby achieving an excellent effect of improving coating quality and extending the life of the blade.

[Brief description of the drawings]

FIG. 1 is a side view of one embodiment of the present invention, FIG. 2 is a side view showing another embodiment of the present invention, and FIG. 3 is a side view showing an embodiment in which the installation location of the synovial fluid coating device is changed. FIG. 4 is a side view showing an embodiment in which the method of the applicator is changed, and FIG. 5 is a side view showing an example of a conventional blade coater. 2 is a backing roll, 3 is paper, 5 is an applicator, 6
Denotes a coating liquid, 7 denotes a blade, 8 denotes a synovial fluid, and 11 denotes a synovial fluid application device.

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Claims (1)

(57) [Claims] 1. A blade coater which includes an applicator and a blade and applies a predetermined amount of a coating liquid to a side surface of a paper which is opposite to a backing roll and is arranged along a backing roll. A coating device for applying a synovial fluid to the side surface of the backing roll.