JP2584923Y2 - Coating equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for applying a coating liquid to a base paper manufactured in a paper mill to perform coating processing.

[0002]

2. Description of the Related Art Paper produced in a paper mill is rarely used immediately as it is, and it is sometimes used as a base paper for further processing to obtain a processed paper as a product meeting a required purpose. Many. As one of the processed papers, there is a so-called coated paper (coated paper) formed by applying a coating liquid to the surface (both sides or one side) of a base paper so that it can be used as a printing paper or the like.

[0003] As one of conventional coating apparatuses for producing such coated paper, there is a so-called gate roll coater. As shown in FIG. 6, the gate roll coater includes applicator rolls 2 and 3 disposed with the base paper 1 interposed therebetween.
The inner gate rolls 4 and 5 and the outer gate rolls 6 and 7 are arranged close to and parallel to each other.
And the coating liquid 8 is stored between the coating liquids.
Is transferred to the surfaces of the applicator rolls 2 and 3 via the inner gate rolls 4 and 5, and the coating liquid 8 on each surface of the applicator rolls 2 and 3 is applied to both sides of the base paper 1.

However, in the case of the conventional gate roll coater as a coating apparatus, maintenance is difficult due to the large number of rolls, and the installation space is large because a large number of rolls are arranged side by side. is there.

Therefore, as shown in FIG. 7, a slit nozzle serving as a coating liquid discharge port is provided at each upper position of a pair of rubber-coated applicator rolls 2 and 3 arranged so as to sandwich the base paper 1 passing therethrough. A liquid supply head 9 having a lower portion 9a,
The applicator rolls 2 and 3 are installed in a non-contact state with respect to the surfaces thereof, and the two liquid supply heads 9 are connected to a variable flow rate type pump 11 via a coating liquid supply pipe 10 to perform coating. The coating liquid 8 in the liquid tank 12 is supplied by the pump 11 to the liquid supply head 9.
The coating liquid 8 stored in the liquid supply head 9 is caused to flow down uniformly through the slit nozzle 9a, and the coating liquid is supplied between the slit nozzle 9a and the surfaces of the applicator rolls 2 and 3. A coating apparatus in which the curtain film 8a of No. 8 is formed over the entire length of the roll has been proposed (Japanese Patent Laid-Open No. 2-180662).

[0006]

However, in the case of the above-mentioned coating apparatus which supplies the coating liquid 8 as the curtain film 8a to the applicator rolls 2 and 3, as shown in FIG. 8, the curtain film 8a is moved from the slit nozzle 9a. Since it is subjected to a contraction action when it is caused to flow down, swelling portions 8b are formed at both width ends of the coating liquid 8 on the surfaces of the applicator rolls 2 and 3, and are directly applied to the base paper 1. When the coated paper is wound into a roll, the raised portion 8b is likely to be insufficiently dried, and when the coated paper is wound into a roll, the raised portion 8b may be stuck to the overlapping paper or may be wound at both ends. Problems such as formation of a roll are caused.

In view of the above, the present invention smoothes the bulging portion at the width end due to the contraction action of the coating liquid curtain film, and adheres to the paper at the time of winding due to insufficient drying, or has a shape in which the end is raised. It is intended to prevent the formation of a take-up roll.

[0008]

According to the present invention, in order to solve the above-mentioned problems, a coating liquid is continuously supplied onto a rotating applicator roll in the form of a curtain film to coat a base paper in contact with the applicator roll. In a coating apparatus adapted to apply the liquid, a smoothing member for smoothing a bulging portion at the width end of the coating liquid supplied on the applicator roll is brought close to the surface of the applicator roll. And the arrangement position of the smoothing member is a required position on the downstream side in the rotation direction from the coating liquid supply position of the applicator roll,
The smoothing member is provided with a position adjusting tool which is displaced in the axial direction and the radial direction of the applicator roll to adjust the position.

[0009]

The coating liquid continuously supplied as a curtain film on the applicator roll is applied to the base paper by the rotation of the applicator roll. At this time, the width end of the coating liquid supplied to the applicator roll is used. Is smoothed by the smoothing member.

[0010]

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

FIGS. 1 to 3 show an embodiment of the present invention. Similar to the coating apparatus shown in FIG. 7, an applicator roll made of rubber is provided at a position in contact with a base paper 1 to be coated. 2, a liquid supply head 9 is installed above the applicator roll 2, and the coating liquid 8 flowing down from the slit nozzle 9 a of the liquid supply head 9 is used as the curtain film 8 a as the above-mentioned applicator roll. In the configuration in which the base material 1 is applied by continuous supply to the surface of the liquid supply head 2, a width adjusting device 1 for adjusting the width of the curtain film 8 a is provided at the outlet of the slit nozzle 9 a of the liquid supply head 9.
3, and a bulging portion 8b formed at a width end of the coating liquid 8 at a required position on the applicator roll 2 at a position downstream in the rotation direction from a position where the coating liquid 8 is supplied. A prismatic smoothing member 14 for smoothing the
5, the position is adjusted so as to be adjustable.

As shown in FIG. 2 and FIG. 3, the position adjuster 15 is provided with a clamp-type holder member 17 on a guide rod 16 arranged vertically (in a direction normal to the applicator roll 2). The holder member 17 can be fixed to the guide rod 16 by fastening the holder member 17 with the thumb screw 18 so that the holder member 17 can be fixed to the guide rod 16.
The support rod 19 fixed to the smoothing member 14 is horizontally penetrated to support the support rod 19 so that it can move horizontally and rotate in the axial direction, and the holder member 17 is tightened with the thumbscrew 20 to support the support rod 19. The rod 19 is fixed to the holder member 17.

When a coating operation is performed on the base paper 1, a coating film flowing down from the slit nozzle 9 a as a curtain film 8 a by the width adjusting device 13 provided in the slit nozzle 9 a of the liquid supply head 9. Change the width of liquid 8 to base paper 1
Adjust so that a non-coated portion (dry edge) can be made at the width end of the. Further, the position of the smoothing member 14 is adjusted by the position adjuster 15 so as to correspond to the position of the thickness and the width end of the coating liquid 8 supplied onto the applicator roll 2.

In this state, the coating liquid 8 is placed in the liquid supply head 9.
Is supplied, the coating liquid 8 is temporarily stored in the liquid supply head 9, and then flows down from the slit nozzle 9 a as a curtain film 8 a in the paper width direction under its own weight or a predetermined pressure to flow down the applicator roll 2. Is applied to the surface of the base paper 1 by rotating the applicator roll 2.

In the above, since the coating liquid 8 supplied onto the applicator roll 2 is subjected to a contraction action when flowing down from the slit nozzle 9a, as shown in FIG.
Crest portions 8 at both width ends (only one end is shown in the figure)
b is formed, but before the applicator roll 2 is applied to the base paper 1, the raised portion 8 b is
Will be smoothed. That is, when the coating liquid 8 is supplied as a curtain film 8 a onto the applicator roll 2, the raised portions 8 b are formed at both ends of the coating liquid 8. Since the smoothing member 14 is disposed at a position downstream of the supply position in the rotation direction so as to correspond to the thickness and the width end of the coating liquid 8,
When the coating liquid 8 moves downstream with the rotation of the applicator roll 2, the rising portion 8 b at the end is smoothed by the smoothing member 14 as shown by the two-dot chain line in FIG. 2. Will be. Therefore, the coating liquid 8 is the same as that shown in FIG.
As shown in (1), since the coating is applied to the base paper 1 in a smooth state without the raised portion 8b at the end, the width end does not become insufficiently dried, the paper does not stick at the time of winding, and the end does not stick. The winding roll is not formed in the shape of the raised portion. Further, in the above, when the coating liquid 8 is applied to the base paper 1 in a state where the raised portions 8b are raked, the width adjusting device 13 is set so that the coating liquid 8 is not applied to the end of the base paper 1.
By adjusting the width of the curtain film 8a accurately by the adjustment of the above, as shown in FIG.
Dry edge 1a can be made.

Next, FIG. 5 shows another embodiment of the present invention. Instead of the method shown in FIGS. 1 to 3 in which the swelling portion 8b of the coating liquid 8 is leveled, The raised portion 8b is cut out and smoothed. That is, the smoothing member 14 has a structure having a knife edge 14a at the lower end, and the knife edge 14a
Opening 14b communicating with the opening is provided at the center so that the rising portion 8b of the coating liquid 8 cut off by the knife edge 14a can be guided to the opening 14b side.
The suction pipe 21 is connected to 4b so that the coating liquid guided to the opening 14b side can be collected at a required location through the suction pipe 21.

The embodiment shown in FIGS. 1 to 3 is advantageous when the viscosity of the coating liquid 8 is relatively low.
When the viscosity increases, the swelling portion 8b may not be able to be completely raked by the smoothing member 14. That point,
In the case of the embodiment of FIG. 5, since the smoothing member 14 has a structure having the knife edge 14a, even the coating liquid 8 having a high viscosity is cut off the raised portion 8b to smooth the coating liquid 8. be able to.

In the above embodiment, the case where the applicator roll 2 is arranged so as to be in contact with one side of the base paper 1 is shown. However, as shown in FIG. A configuration may be adopted in which the coating liquid 8 is applied to both sides of the base paper 1 by arranging them, and it is a matter of course that various changes can be made without departing from the embodiment of the present invention.

[0019]

As described above, according to the coating apparatus of the present invention, the coating liquid is continuously supplied onto the rotating applicator roll in the form of a curtain film, and the coating liquid is applied to the base paper in contact with the applicator roll. In a coating apparatus that is to apply a smoothing member for smoothing the width end bulging portion of the coating liquid supplied on the applicator roll, close to the surface of the applicator roll With the arrangement, the arrangement position of the smoothing member is set to a required position on the downstream side in the rotation direction from the coating liquid supply position of the applicator roll, and the smoothing member is displaced in the axial direction and the radial direction of the applicator roll. Is provided with a position adjuster that is adapted to adjust the position of the coating liquid, so that the rising edge of the width end of the coating liquid supplied on the applicator roll can be smoothed by a smooth member. By applying the smoothed coating liquid to the base paper, it is possible to eliminate the lack of local drying while forming a dry edge, and to stick the paper at the time of winding up with it and the shape with raised edges And the smooth member can be displaced in the axial direction and radial direction of the applicator roll to adjust the position. Even when the thickness of the working fluid changes, it can easily follow the working fluid, etc.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a coating apparatus of the present invention.

FIG. 2 is an enlarged view in the direction of arrow II in FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2;

FIG. 4 is a schematic diagram showing a state in which a coating liquid is applied to base paper.

FIG. 5 is a partially enlarged sectional view showing another embodiment of the present invention.

FIG. 6 is a schematic view of a gate roll coater showing an example of a conventional coating apparatus.

FIG. 7 is a schematic view showing another example of a conventional coating apparatus.

8 is an enlarged view in the direction of arrows VIII in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base paper 2, 3 Applicator roll 8 Coating liquid 8a Curtain film 8b Rising part 14 Smooth member 15 Position adjuster

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B05C 1/00-1/16 B05C 5/02

Claims (1)

(57) [Scope of request for utility model registration] 1. A coating apparatus, wherein a coating liquid is continuously supplied onto a rotating applicator roll in the form of a curtain film to apply the coating liquid to base paper in contact with the applicator roll. A smoothing member for smoothing the bulging portion at the width end of the coating liquid supplied on the roll is arranged close to the surface of the applicator roll, and the disposition position of the smoothing member is set to the applicator roll. Required position on the downstream side in the rotation direction from the coating liquid supply position of
The coating apparatus further comprises a position adjusting tool for adjusting the position by displacing the smooth member in the axial direction and the radial direction of the applicator roll.