JP2555047Y2 - Roll coater - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll coater.

[0002]

2. Description of the Related Art When a relatively thin and uniform coating liquid such as an adhesive, a magnetic tape coating, or a high-viscosity coating is applied to a sheet such as paper, cloth, film, etc., as shown in FIGS. A reverse type roll coater as shown is used.
In FIG. 3, the sheet 1 is moved rightward by the rotation of the backing roll 2, and the applicator roll 3 rotates below the backing roll 2 while abutting on the lower surface of the sheet 1. Tarol 3
The coating liquid 4 is sprayed on the lower side by a plurality of nozzles 5. A metering roll 6 is provided in parallel with the applicator roll 3, and the coating liquid 4 sprayed on the applicator roll 3 is equal to the size of the gap 7 between the applicator roll 3 and the metering roll 6. The thickness is adjusted and applied from the applicator roll 3 to the lower surface of the sheet 1. Excess paint adhering to the metering roll 6
The knife 8 scrapes off the metering roll 6. In the case of FIG. 4, instead of spraying the coating liquid 4 on the applicator roll 3, the lower part of the pickup roll 10 in contact with the applicator roll 3 is immersed in the coating liquid 4 in the pan 9 and supplied. . Sheet 1
The thickness of the coating liquid 4 to be applied to is determined by the size of the gap 7 between the applicator roll 3 and the metering roll 6.

[0003]

However, in the method of spraying the coating liquid 4 onto the applicator roll 3 by the nozzle 5 as shown in FIG. 3, the dispersion of the gap between the nozzle 5 and the applicator roll 3 is reduced. It is difficult to obtain a uniform coating thickness on the application surface of the applicator roll 3 because it is difficult to make the coating uniform, and since the spraying is performed by the nozzle 5, the application amount of the coating liquid 4 A change occurs to cause unevenness in the coating thickness, and it is difficult to obtain a uniform coating thickness. Further, the gap between the nozzle 5 and the applicator roll 3 is narrow (50 to 500 μm), and adjustment is difficult.

[0004] For this purpose, in consideration of the above-mentioned unevenness of the coating film thickness, a multi-coating liquid 4 is applied by a nozzle 5, and a surplus coating liquid 4 is scraped off by a metering roll 6 so that a final coating liquid 4 is scraped off. The thickness of the coating is determined, but if the unevenness of the coating amount is large, the unevenness of the coating amount affects the coating thickness determined by the gap 7 and causes unevenness of the coating thickness, There is a problem that quality is adversely affected.

[0005] Further, as described above, the use of a larger amount of the coating liquid 4 than the required amount increases the cost of the coating liquid 4 and is not economical.

Also, in the case shown in FIG. 4, it is difficult to adjust the thickness of the coating applied to the applicator roll 3 because the pickup roll 10 is immersed in the pan 9, and therefore, a large amount of the coating is required. It is necessary to apply the coating liquid 4 and
It is difficult to apply the coating liquid 4 uniformly, and has the same problem as described in the case of FIG.

Further, in the case shown in FIG. 4, when the pickup roll 10 collects the coating liquid 4 in the pan 9, the coating liquid 4 in the pan 9 is agitated, so that air is mixed into the coating liquid 4. As a result, when the coating liquid 4 is applied to the sheet 1, there is a problem that air bubbles are generated on the application surface and adversely affect the quality of the sheet 1.

The present invention has been made in view of such circumstances, and minimizes the supply of a coating liquid applied to a sheet, prevents generation of air bubbles, and makes the coating thickness of the coating liquid uniform with high precision. It is intended to provide a roll coater that can perform the following.

[0009]

According to the present invention, there is provided a backing roll for winding and moving a sheet, a color roll for receiving a coating liquid and applying the coating liquid to the sheet wound on the backing roll, and a color roll. A roll coater comprising a metering roll that forms a gap between the roll and adjusts the thickness of the coating liquid applied to the sheet by the gap, and a position above the color roll, from a header. Of the slit through which the coating liquid flows down
A curtain-type applicator whose dimension in the circumferential direction can be adjusted , the lower end of the curtain-type applicator having the color row
And arranged to separate a predetermined distance from the surface of Le, the
It is designed so that the coating liquid can flow down onto the upper surface of
It has been achieved .

[0010]

[Action] curtain applicator liquid to flow down by the curtain film was adjusted to a uniform thickness in the width direction by and applied to the upper surface color roll. At this time, since the thickness of the curtain film by the curtain type applicator is accurately adjusted by the slit, the amount of excess coating liquid removed by the metering roll is minimized and foaming is prevented , and furthermore,
The tip of the curtain type applicator is the top of the color roll
Is not in contact with the tip of the curtain-type applicator.
Is not dirty.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In the drawing, reference numeral 1 denotes a sheet, 2 denotes a backing roll for winding and moving the sheet 1, and the backing roll 2 is located below the backing roll 2. A color roll 11 that contacts the sheet 1 and rotates the backing roll 2 in the opposite direction at a position where the color roll 11 contacts the sheet 1 is provided. A curtain type applicator 12 for applying the coating liquid 4 to the color roll 11 in the form of a curtain film 24 is disposed above the color roll 11, and the color roll 11 is received from the curtain type applicator 12. The coating liquid 4 is applied to the sheet 1 by abutting on the sheet 1 wound on the backing roll 2.

[0013] The curtain applicator 12, as shown in FIG. 2, for example, supplied to the upper color roll 11 rotating, flows down to the color roll 11 (a natural drop under or the ejection) may be applied a coating liquid 4 by A head 13 is provided. The supply head 13 hangs down from an upper support member 14 fixed to a frame or the like (not shown) and has a length substantially equal to the width of the color roll 11 in the width direction of the color roll 11. A front head portion 16 and a rear head portion 17 which extend at a distance and are separated into a front portion and a rear portion in the rotation direction of the color roll 11 so as to form a header 15 for supplying the coating liquid 4 therein; The header is attached to a lower portion of the head portion 16 through a slit portion adjusting mechanism 18 such as a bolt, and extends in the width direction of the color roll 11 with substantially the same length as the width of the color roll 11 between the rear head portion 17. And a lip 20 which form a slit 19 communicating with 15.

A gap 21 is formed below the color roll 11 between the color roll 11 and the metering for adjusting the thickness of the coating liquid 4 applied to the sheet 1 by the gap 21. A roll 6 is provided.

In FIG. 1, reference numeral 22 denotes a knife for scraping off the excess coating solution 4 attached to the metering roll 6, and reference numeral 23 denotes a pan for storing the coating solution 4 scraped off by the knife 22.

The curtain curtain falling from the header 15 of the supply head 13 of the applicator 12 towards the color roll 11 for rotating the coating liquid 4 through the slit 19 (a natural drop under or jet) is formed by this A film is formed on the upper surface of the color roll 11 by the film 24.

At this time, in the curtain type applicator 12, the coating liquid 4 can be uniformly applied in the width direction of the color roll 11. That is, the slit 19 spacing is precisely adjusted in advance by the slit adjusting mechanism 18, and then the flow rate of the coating liquid 4 per unit width in the width direction of the curtain film 24 is measured in a state where a constant amount of the coating liquid 4 is supplied. By finely adjusting the interval between the slits 19 by the slit adjusting mechanism 18 based on the measured value, the curtain film 24 having a uniform flow rate over the entire width can be formed and applied.

Therefore, the minimum necessary amount of the coating liquid 4 can be applied to the color roll 11.

The coating liquid 4 formed on the color roll 11 with a uniform coating thickness over the entire width is adjusted to a thickness equal to the dimension of the gap 21 between the color roll 11 and the metering roll 6 and finally adjusted. And applied to one side surface of the sheet 1 wound around the backing roll 2 from the color roll 11.

At this time, the curtain type applicator 1
2, the thickness of the coating applied to the color roll 11 becomes uniform in the width direction, so that the thickness of the coating liquid 4 applied to the sheet 1 determined by the gap 21 with the metering roll 6 is uniform in the width direction. Further, since the flow rate of the coating liquid 4 supplied to the color roll 11 can be minimized and the amount scraped off by the metering roll 6 can be minimized, the usage amount of the coating liquid 4 can be saved. Also, it is possible to prevent bubbles from being generated in the coating liquid 4.

It should be noted that the roll coater of the present invention is not limited to the above-described embodiment, but may be variously modified without departing from the gist of the present invention.

[0022]

As described above, according to the roll coater of the present invention, various excellent effects as described below can be obtained.

(I) provided on a curtain type applicator
Adjust the circumferential dimension on the color roll of the slit
The thickness of the curtain film can be adjusted and the coating liquid can be applied uniformly with high accuracy over the entire width of the color roll, so the thickness of the coating liquid after the thickness is determined by the metering roll is kept constant in the width direction And the quality of the sheet can be improved.

(II) As described above, a high-precision and uniform coating thickness can be obtained only by supplying the necessary minimum amount of the coating liquid, so that the cost for the coating liquid can be reduced and it is economical. .

[0025] (III) coating was allowed to flow down from above the color roll by a curtain applicator and than you applied to color roll top, to prevent air bubbles are generated by mixing the coating liquid, bubbles As a result, the quality of the sheet does not deteriorate.

(IV) The lower end of the curtain type applicator
Since it does not touch the surface of the color roll,
The locator is not smeared by paint and therefore
Good operability with no unevenness in the coating due to no contamination of the liquid
It is good.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a sectional view showing an example of a curtain type applicator.

FIG. 3 is a side view showing an example of a conventional roll coater.

FIG. 4 is a side view showing another example of the conventional roll coater.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sheet 2 backing roll 4 coating liquid 6 metering roll 11 color roll 12 curtain type applicator 19 slit 21 gap 24 curtain film

Claims (1)

(57) [Scope of request for utility model registration] A gap is provided between a backing roll for winding and moving a sheet, a color roll for receiving a coating liquid and applying the coating liquid to the sheet wound on the backing roll, and a color roll. A metering roll for adjusting the thickness of the coating liquid to be formed and applied to the sheet by the gap, wherein a coating from a header is provided at a position above the color roll.
Adjust the size of the slit in which the liquid flows down in the circumferential direction of the color roll.
Adjustable curtain type applicator
The lower end of the locator is fixed to the surface of the color roll.
And apply the coating solution on a color roll.
A roll coater characterized in that it can be applied to a surface by flowing down .