JP3254089B2 - 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 performing paper coating on a papermaking machine.

[0002]

2. Description of the Related Art FIG. 3 shows a bevel blade system (a) and a vent blade system (b) which are conventional coating units. In the bevel blade system, a bevel blade 2 having a cutting edge fixed to a backing roll 1 by a blade holder 4 is attached at an angle α ₁ and supported by a metal bar 3. In FIG. 3A, the basic method of controlling the coating film thickness is to give an angle β ₁ about the point B at an angle α _{1 about} the point A so that the linear pressure P Is added to control the film thickness. In the vent blade system shown in FIG. 3B, a vent blade 5 having no included angle fixed by a blade holder 4 is attached to a backing roll 1 and supported by a tube 7 fixed to a holder 6. The basic control of the coating film thickness is as follows. A constant amount of air is sealed in a tube 7 provided on the back of the vent blade 5, a linear pressure P having a certain width at the tip of the blade is applied, and an angle α about the point A is set. By increasing or decreasing ₂ , the width of the linear pressure P is changed to control the film thickness. In the Baval blade method and the vent blade method as described above, the film thickness is controlled according to the respective optimum conditions by changing the supporting method of the blade back surface.

FIG. 4 is a sectional view schematically showing the vicinity of a coater head of a conventional coating apparatus. Coating part is coater head 13
The coater head is rotatable around a point A or a point B by a device (not shown), and imparts an angle α or an angle β of the blade. The bevel blade method and the vent blade method are used as shown in Table 1 below.

[Table 1]

[0004]

According to the above prior art, the coating liquid transferred to the paper surface on the backing roll 1 is coated with a bevel blade method in a coating apparatus for controlling the coating film thickness by each method. In addition, in the case of the vent blade method, there is a problem that the coating part has to be replaced, and a long time is required for the change. Further, in the vent blade system, when only a tube is used, the force of scraping the coating liquid during high-speed coating is insufficient, and it may be difficult to control the coating film thickness in a thin film. The present invention is intended to solve the above-mentioned conventional problems, and does not change the basic coating film thickness control method of the bevel blade and the vent blade method, but changes the support on the back surface of each blade to the same shape and shares the same. It is an object of the present invention to provide a coating apparatus capable of shortening a replacement time and improving a scraping force of a high-speed vent blade.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention is an apparatus for applying a coating liquid to a web on a backing roll, the apparatus comprising means for rotating a coater head about one point on a blade. In the coating apparatus, means for moving the holder supporting the back surface of the blade in parallel with the blade, blade pressing means which can be expanded and contracted by fluid pressure below the blade pressing fulcrum, and blade pressing elasticity above the blade pressing fulcrum A member is provided, and this is used as a means for solving the problem. The present invention is also an apparatus for applying a coating liquid to a paper web on a backing roll, the apparatus comprising:
Means for rotating the pad about a point on the blade;
The bell blade and vent blade can be replaced and installed.
A holder that can move toward the backing roll side,
A blade pressing means is provided above the blade pressing fulcrum of the holder, the blade pressing means being expandable and contractable by a fluid pressure, and is used as means for solving the problem.

[0006]

According to the first aspect of the present invention, a basic vent is formed by moving the support holder upward by a distance Y from the bevel blade system in which the support holder presses at a blade pressing fulcrum. By pressing the tip of the blade with the blade pressing elastic member and applying fluid pressure to the telescopic blade pressing means below the fulcrum, the vent amount can be further changed from the basic vent shape. Further, in the invention of claim 2, the bevel blade system in which pressing is performed at the blade pressing fulcrum,
By moving the support holder in parallel to the backing roll by the distance X, a basic vent can be formed, and the shape of the blade can be changed by enclosing the fluid pressure in the scalable blade pressing means.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an embodiment of the present invention; FIG. FIG.
2A and 2A show a bevel blade system, and FIG.
(B) and FIG. 2 (b) show a vent blade system. First, referring to FIG. 1 (a), this coating apparatus applies a coating liquid to a web 14 on a backing roll 1, and a coater head rotates around a blade pressing fulcrum 2a on a bevel blade 2. Moving means. On the back of the bevel blade 2, there is a holder 8 forming the fulcrum 2a.
Lifting means 16 that moves in parallel to At a position below the blade pressing fulcrum 2a of the holder 8, a tube 10 which is a blade pressing means which can be expanded and contracted by fluid pressure is provided.
The holder 8 at a position above the fulcrum 2a is provided with an elastic body 9 for pressing the blade.
The bevel blade 2 is mounted on a blade holder 4, rotates the blade 2 around a blade pressing fulcrum 2 a of the holder 8 as a fulcrum, and brings the bevel blade 2 into contact with the backing roll 1. Now in FIG. 1 (a), as a base point to point A, after setting the bevel angle of the bevel blades 2 in an angle alpha _1, the coating film given linear pressure P by giving the angle beta ₁ to the base point of the point B Control the thickness.

Next, the vent blade system shown in FIG. 1B enables venting by moving the support holder 8 used in the bevel blade system of FIG. 1A upward by a distance Y. A basic blade is formed by attaching the vent blade 5 to the blade holder 4 and pressing the vent blade 5 at a fulcrum 5a at the tip of the support holder 8. At this time, if the tip of the vent blade 5 is pressurized by the elastic body 9 provided above the fulcrum 5a of the support holder 8 and a fluid such as air is sealed in the tube 10 provided below the fulcrum 5a, the basic vent shape is further improved. Vent amount can be changed. Such a support holder 8 having the above functions to change the shape of the vent blades 5, the control of the coating thickness is done by increasing or decreasing the beta ₁ corner that originates the point A.

2 (a) and 2 (b), FIG. 2 (a) shows a bevel blade system, and FIG. 2 (b) shows a vent blade system, in which a paper web 14 on a backing roll 1 is coated. The coating apparatus is provided with means for rotating the coater head about the blade pressing fulcrum 2a or 5a of the bevel blade 2 or the vent blade 5, and supports the blade 2 or 5. A tube 12 is provided above the blade pressing fulcrum 2a or 5a of the support holder 11 as a blade pressing means which can be expanded and contracted by a fluid pressure of air or the like. Both the bevel blade 2 and the vent blade 5 are blade holders 4. Mounted on

The vent blade system is made possible by moving the support holder 11 to the left (backing roll 1 side) in parallel with the distance X from the bevel blade system shown in FIG. When the vent blade 5 is attached, a basic vent can be formed by pressing the blade 5 with the tip of the support holder 11, and the amount of vent can be changed by the dimension value of the distance X. FIG. 2 (b)
Here, a fluid such as air or liquid is sealed in a tube 12 provided on the upper part of the support holder 11 so as to apply a linear pressure to the tip of the blade 5. With the support holder 11 having such a function, to form a vent blade, control of coating thickness is carried out in increasing or decreasing the beta ₁ corner of base points a.

[0011]

As described above in detail, according to the present invention, it is not necessary to replace the coating portion between the bevel blade system and the bent blade system as in the conventional case, and it is necessary to replace the coating region as in the conventional case with the bevel blade system. However, the bevel blade method can be easily changed to the vent blade method simply by moving the support holder upward or to the backing roll side, and the structure and operation are easier than before, and the change time is shorter. Can be shortened.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a coating apparatus according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of a coating apparatus according to a second embodiment of the present invention.

FIG. 3 is a side sectional view showing a conventional bevel blade system and a vent blade system.

FIG. 4 is a side sectional view of the vicinity of a coater head of a conventional coating apparatus.

[Explanation of symbols]

 Reference Signs List 1 backing roll 2 bevel blade 2a, 5a blade pressing fulcrum 4 blade holder 5 vent blade 8 support holder 9 elastic body 10 tube (expandable blade pressing means) 11 holder 12 tube (expandable blade pressing means) 14 papers 16 Lifting means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-108210 (JP, A) JP-A-8-108124 (JP, A) JP-A-62-42762 (JP, A) JP-A-62-108 171773 (JP, A) JP-A-3-30867 (JP, A) JP-A-6-285419 (JP, A) JP-B-40-8896 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B05C 11 / 02,11 / 04 D21H 23/34-23/38

Claims (2)

(57) [Claims] An apparatus for applying a coating liquid to a paper web on a backing roll, wherein the coating apparatus includes means for rotating a coater head about one point on a blade, and supports a back surface of the blade. Means for moving the holder to be moved in parallel with the blade, blade pressing means which can be expanded and contracted by a fluid pressure below the blade pressing fulcrum, and a blade pressing elastic member provided above the blade pressing fulcrum. Engineering equipment. 2. An apparatus for applying a coating liquid to a paper web on a backing roll, wherein a hand for rotating a coater head about one point on a blade is provided.
Steps, bevel blades and vent blades can be replaced and installed,
And a holder that can be moved toward the backing roll
And a blade pressing means which can be expanded and contracted by a fluid pressure above the blade pressing fulcrum of the holder .