JPH0422470A - Profiler bar and coating amount control apparatus - Google Patents

Abstract

PURPOSE:To achieve uniform coating to a lateral direction by forming the profiler bar being the pressurizing fulcrum in the deformation of a blade from a hollow rubber tube and dividing the central part thereof into a plurality of parts and controlling pressure at every divided parts. CONSTITUTION:In a blade coater, the profiler bar 1 being the pressurizing fulcrum in the deformation of a blade is formed from a hollow rubber tube 2 and the hollow part of the profiler bar 1 is partitioned by respective partition walls 5 to provide pressure chambers 6 and a fluid is supplied to the chambers 6 from pressure feed pipes 4 to control the internal pressure thereof. As a result, a coating amount can be more rapidly controlled in a lateral direction as compared with a conventional case, subjecting an air tube to the profile control of a coating amount by a screw jack.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for adjusting the iJ force direction coating amount of a web. More specifically, it relates to a method of uniformly coating in 1) directions by partially adjusting the nip pressure at the tip of the blade of a blade coater and the pressure of a split profiler bar.

[Conventional technology]

The conventional method of coating using a blade coater uses a cantilever structure in which one end of the blade is clamped, the other end is in contact with the web surface, and a support part is provided in the middle of the blade.
Generally, the coating liquid is measured by deforming the blade and using the reaction force at that time to obtain the necessary linear pressure for metering. The intermediate support section is generally called a profiler bar. The linear pressure design of the blade is based on the premise that the profiler bar is made of metal and will not be deformed by the deformation of the blade. However, in actual coaters, a rubber tube is often used, and the deformation of the tube is adjusted by inserting air into the tube and adjusting the pressure. The advantage of using tubing for the profiler bar is the flexibility of the tubing. It appropriately absorbs machine vibrations and uneven web thickness. To explain the conventional blade coater head with reference to FIGS. 7A-C, a blade 102 has one end connected to a clamp 10.
3, the coating liquid is pressed against the packing roll 107 holding the web 108, and the coating liquid that is excessively transferred at the coating liquid application part 106 is measured by the reaction force that deforms the blade 102 to the target coating amount. be done. FIG. 7B is a partially enlarged view of the profiler bar and the coating amount profile adjustment device in the 11] direction, and the blade 102 is supported by the profiler bar 101 and the profiler bar 101 is supported by the profiler bar 101.
is supported at its rear by a plate 109, and is pushed and pulled through a part 110 integrated with the coater head by a screw jack 1.05, which is made of a helical screw. As shown in FIG. 7C, this profiler bar 101 has a large number of screw jacks 105 installed in the width direction to push the profiler bar 101 in the middle direction.
If there is variation in the coating amount in the middle direction, by pushing or pulling this, the linear pressure of the blade 102 in the width direction can be adjusted to correct the unevenness in the coating amount in the middle direction. Ru. The advantage of using an air tube as the profiler bar 101 is its flexibility, but the disadvantage is that it is compressible because it is a gas. In order to obtain the target coating amount, the blade is deformed and the reaction force generates the linear pressure necessary for measuring the coating liquid at the tip of the blade, but even if the tube pressure is increased, the pressure at the tip of the blade does not increase. This is the point where it escapes due to the deformation of the tube. This also applies to the adjustment of the coating amount profile in 11 directions, and even if the adjustment is performed using the screw jack 105 of the profiler bar 101, the effect will not be very noticeable. In addition, if the coating amount changes over time, the amount of deformation of the blade is adjusted to change the linear pressure at the blade nip in order to keep the coating amount constant. There are deformations due to rotation and deformation due to pressing, etc.
A problem arises when the deformation of the blade moves from the pressure side of the nip pressure to the pressure side or vice versa over an extended period of time. In fact, some blade coaters have a width of 9 meters or more, and the head is supported at both ends of the blade coater. The coating amount of the blade is adjusted by rotating and translating the coater head to deform the blade, and this is done by an actuator such as a pressure jack attached to the coater head. It depends on the position of the pressure jack,
When viewed in the width direction, the deformation of the blade beam is that if it is on the pressure side of the blade nip pressure, it is pushed out at the jacked part, and if it is on the reduced pressure side, it is pulled in at the jacked part. This change in the way the blade beam deforms causes a problem in that the mid-direction profile of the coating amount changes. At this time, the coater operator uses multiple screw jacks installed in the middle of the profiler bar to push the profiler bar toward the web side in areas with a large coating amount, and pull it out in areas with a small coating amount. The coating amount profile is adjusted by this operation. In addition, a method has been developed to date in which the profiler bar is pushed or pulled using a screw jack on the beam that supports the profiler bar to adjust the coating amount distribution in the width direction. Methods such as providing feedback using labor detection equipment and remote control methods have already been developed. (For example, JP-A-62i80
No. 774, JP-A-52-180775, JP-A-62-
171773, JP-A-63-151377, etc.)
These methods also have the disadvantage of slow response when using air tubes. Metal bars require a large amount of force to deform, and once deformed, they have the disadvantage of being difficult to return to their original shape.

[Problem to be solved by the invention]

The present invention solves the above-mentioned drawbacks and aims to provide a uniform coating layer in the direction of the web 11, and uses a split profiler bar to partially adjust the pressure and apply the coating uniformly in the width direction. The purpose is to provide a method.

[Means to solve the problem]

The present invention provides a profiler in a blade coater, characterized in that the profiler bar that receives pressure due to blade deformation is a hollow rubber tube, and the hollow part of the profiler bar is divided into a plurality of pieces in the "1" direction. The profiler bar can be divided by a partition wall that is integrated with the tube itself, and the profiler bar can be divided by a partition wall that is integrated with the tube itself. The pressure box may be expanded and contracted using a fluid or a piezoelectric actuator. Another invention uses the profiler bar described above to adjust the coating amount. In the blade coater,
The profiler bar that receives pressure due to blade deformation is made of a hollow rubber tube, and the hollow part of the profiler bar is divided into a plurality of parts in the width direction, and the hollow parts are divided in accordance with the coating amount or moisture value in 11 directions of the web. This is a coating amount adjustment method characterized by adjusting the pressure in the area using a fluid or a piezoelectric actuator. By creating small chambers divided in the middle direction in the profiler bar and adjusting the fluid pressure in each chamber, it is possible to adjust the blade nip pressure in the width direction. Fluids used in the present invention include liquids and gases, but it is preferable to use a small compressible liquid as a filling medium in the tube.
It is easier to increase the pressure inside the tube by using a liquid. There are two ways to divide a rubber tube into each chamber: to integrate the tube itself and the partition wall, or to install a section inside an elastic hollow bar that can be expanded and contracted by pressure (
There is a method of creating a profiler bar with a double structure in which a plurality of pressure boxes (hereinafter referred to as pressure boxes) are arranged, but from the viewpoint of workability and discontinuity of the partition wall, it is preferable to create a profiler bar with a double structure. . The profiler bar is adjusted by changing the internal pressure of this pressure box using fluid or by changing the potential using a piezoelectric actuator. There is a relationship between the thickness and elastic modulus of the outer rubber, but by providing a certain degree of rigidity through such a double structure, even if there is local deformation in a certain part, a certain pressure distribution will be created around it. There is also the advantage that it becomes easier to adjust the coating amount.

【Example】

The present invention will be explained in detail by examples. FIG. 1A is a sectional view of a profiler bar showing an embodiment of the present invention, in which a pedestal 3 is covered with a rubber tube 2, and a space surrounded by these becomes a pressure chamber 6. 1st
Figure B is 8-8 of Figure 1A. The pressure chambers 6 are each partitioned by a partition wall 5, and fluid is sent to each pressure chamber by a pressure sending vibrator 4 to adjust the internal pressure. FIG. 2 is a diagram showing another embodiment of the profiler bar, in which a plurality of pressure boxes are provided within a rubber tube. FIG. 2A is a cross-sectional view of the profiler bar, and FIG. 2B is a cross-sectional view taken along line BB' in FIG. 2A. The outer tube 12 is installed on the pedestal 9 and has a single cylindrical shape with no partition in the middle direction. Inside this, there is a pressure wall 7 that expands and contracts with pressure and a frame 8 that supports it.
The internal pressure of the pressure chamber 10 created by the pressure chamber 10 is adjusted by a pressure sending vibrator 11. Note that the rubber material and the type of fluid are not particularly limited and may be used by selecting conditions that are easy to use. Essentially, the control in each pressure chamber is such that expansion due to pressurization depends on the pressure, and contraction due to depressurization depends on the rigidity of the rubber tube 2 and the outer tube 12. Figures 3, 4 and 5 are schematic diagrams of other types of pressure boxes placed within the tube. In Figure 3, the pressure box itself has a cylindrical structure. The pressure transmitting section 13 moves by inserting fluid into the pressure chamber 15, and the fixed frame 14 and the transmitting section 13 have a sliding structure. FIG. 4 shows a type in which a cylinder 19 is attached between the fixed pedestal 20 and the movable pedestal 18, and an elastic body 17 is attached to the movable pedestal 18 to protect the outer tube 12. A pressure pipe 21 to the cylinder 19 is provided on the fixed frame 20 . FIG. 5 shows the displacement of the movable frame 18 using the piezoelectric actuator 22 rather than the pressure caused by fluid. The structure is similar to that shown in FIG. 4, and a piezoelectric actuator 22 is provided between the fixed pedestal 20 and the movable pedestal 18.
An elastic body 17 is provided on the movable frame 18. Note that it is desirable to have two pressure pipes, one on the inlet side and one on the outlet side. FIG. 6 shows a blade coater head using the profiler bar 1 of FIG. 1 of the present invention, in which the blade 23 is held at one end by a clamp 24 and pressed against a packing roll 28 holding a web 29. The coating liquid excessively transferred in the coating liquid applicator 27 is measured by the reaction force of the blade 23 deformed to the target coating amount. The deformation of the blade 23 is achieved by inserting or withdrawing fluid from the pressure pipe 25 of each pressure chamber 10 supported by a beam 26 and provided on the pedestal 3 of the profiler bar 1.
The pressure chambers of the bar 1 are adjusted to expand and contract in order to correct the non-uniformity of the coating amount in the 11 directions. The method for adjusting coating amount fluctuations in the 11-direction of the web, detected visually using the transmission method and by a B/M meter, is to increase the pressure where the coating amount is large and lower the pressure where the coating amount is small. is fundamental, and the specific amount of variation must be calculated by collecting actual data for each mechanism, model, and coated paper. The pressure in the divided pressure chambers may be adjusted manually depending on the coating amount variation in the web width direction, preferably in conjunction with the coating amount or moisture value in the [1] direction of the B/M meter. It is better to automatically adjust the room pressure. [1) The number of divisions in the direction is not particularly limited, but the size of one pressure chamber is 20~
A range of 150 nm is suitable.

【Effect of the invention】

By using the split profiler bar of the present invention,
It is possible to adjust the coating amount in the middle direction more quickly than when adjusting the coating amount profile using a conventional air tube with a screw jack.

[Brief explanation of the drawing]

1A-B and 2A-B are cross-sectional views of the profiler bar of the present invention. 3, 4 and 5 are schematic diagrams of the pressure box. FIG. 6 is a schematic diagram showing the blade coater head of the present invention. 7A-7C are schematic diagrams showing the structure of a conventional coater head and profiler bar. 1... Profiler bar 2... Rubber tube, 3... Frame, 4... Pressure pipe, 5... Partition wall, 6... Pressure chamber, 7... Pressure wall, 8.9. ... pedestal,
10...Pressure chamber, 11...Pressure pipe, ]2
...Outer tube, 13...Pressure transmission part, 14.
...Fixed mount, 15...Pressure chamber, 16...Pressure pipe, 17...Elastic body, 18...Movable mount, 19...Cylinder 20...Fixed mount, 2
DESCRIPTION OF SYMBOLS 1...Pressure pipe, 22...Piezoelectric actuator 23...Blade, 24...Clamp, 25
... Pressure pipe, 26 ... Beam, 27 ... Application part, 28 ... Packing roll, 29 ... Web, 101 ... Profiler bar 102 ... Blade, 03 ... Clamp, 04... Beam, 05... Screw jack 06... Application part, 07... Packing roll, 08... Web, 09... Plate, 10... Clamp integral part, v, 1F5 illustration λP) l Tototsuma 1 illustration 2A illustration rod Z1 sideson 7A1 Ko

Claims (1)

[Claims] 1. In the blade coater, the profiler bar, which is the fulcrum of pressure for blade deformation, is a hollow rubber tube, and the hollow part of the profiler bar is divided into a plurality of parts in the width direction, and the pressure is applied to each divided part. A profiler bar that is adjustable. 2. The profiler bar according to claim 1, characterized in that the division of the profiler bar is a partition wall integrated with the tube itself. 3. The profiler according to claim 1, wherein the pressure division in the width direction of the profiler bar is performed by a pressure box provided in a rubber tube that expands and contracts with pressure. bar. 4. The profiler bar according to claim 3, wherein the pressure box is expanded and contracted by a piezoelectric actuator. 5. In the blade coater, the profiler bar that receives pressure due to blade deformation is a hollow rubber tube,
The hollow part of the profiler bar is divided into a plurality of parts in the width direction, and the pressure in the divided hollow parts is adjusted using a fluid or a piezoelectric actuator in conjunction with the coating amount or moisture value in the width direction of the web. Coating amount adjustment method.