JP3652892B2 - Coating equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating apparatus for a papermaking machine having a finishing portion that can handle a plurality of types of finishing blades.
[0002]
[Prior art]
FIG. 7 is a conceptual diagram showing a part of a conventional paper coater 101. The manufacturing process of the coated paper will be described below using this figure.
First, a paper roll 102 and a backing roll 103 are rotatably supported with a gap therebetween, and a coating base paper 104 is wound around these rolls 102 and 103. A coating liquid recovery pan 105 is disposed below the backing roll 103, and an applicator nozzle 106 is disposed in the coating liquid recovery pan 105 obliquely upward. Further, a support arm 107 pivotally supported around the lower end portion is disposed on the side of the applicator nozzle 106, and a finishing portion 108 is provided on the upper portion of the support arm 107. ing.
When the coating liquid 109 is discharged from the applicator nozzle 106 onto the coating base paper 104, a transfer liquid film 109b having a thickness of about 150 to 250 μm is formed on the surface of the coating base paper 104 as will be described later with reference to FIG. Is formed. The transfer liquid film 109b is scraped off by the finishing portion 108 to form a coating liquid film 109a of about 5 to 20 μm, and then the coating base paper 104 is dried in the next step (not shown). To become a dry coated paper.
[0003]
Next, the configuration and operation of the conventional finishing unit 108 will be described. FIG. 8 is a cross-sectional view taken along the line CC in FIG. 7 and shows a part of the conventional finish portion 108. A circular hole 110 is formed in the support arm 107 formed in a plate shape, and an outer bush 111 and an inner bush 112 are rotatably supported in the hole 110. The outer bush 111 is formed in a ring shape, and the inner bush 112 disposed inside the outer bush 111 is formed in a disk shape. The rotation of the outer bush 111 is centered on the center line 111a and is different from the center line 112a, which is the center of rotation of the inner bush 112, in the vertical direction. The inner bush 112 is a bush for setting an initial setting angle, and is connected to a header 114 via an attachment member 113. A solid bar holder 116 to which a finishing blade 115 is attached is disposed above the header 114. It is arranged. The upper end 115 a of the finishing blade 115 is set to be substantially the same height as the center line 111 a of the outer bush 111.
[0004]
Here, the thickness of the coating liquid film 109a formed on the surface of the coating base paper 104 is controlled by the thickness and length of the finishing blade 115, the tip polishing angle, the applied pressure, and the like. In order to increase the thickness of the coating liquid film 109a, a thin and long finishing blade 115 having a sharp tip polishing angle is selected. The initial setting angle of the finishing blade 115 is adjusted by rotating the bushes 111 and 112 attached to the support arm 107 in accordance with the tip polishing angle of the blade 115.
[0005]
The effect | action which changes the direction and height of the finishing blade 115 with the conventional coating apparatus which has the said structure is demonstrated using FIGS. 9-12.
FIG. 9 shows a state in which the finishing portion 108 is at the operation origin, the tip 115 a of the finishing blade 115 is in contact with the surface of the coating base paper 104 wound around the backing roll 103, and the finishing blade 115. There is no deflection. From this state, by rotating the outer bush 111 counterclockwise in the drawing, the entire finishing portion is set to the initial state shown in FIG. 10, but even in this state, the finishing blade 115 is not bent. . At this time, the gap d between the tip polished surface 115b of the finishing blade 115 and the surface of the coated base paper 104 is usually narrower toward the blade tip at an angle of about 0 to 5 degrees as shown in FIG. . At the start of coating, as shown in FIG. 12, the finishing portion 108 is further rotated by rotating the inner bush 112 provided in the outer bush 111 counterclockwise. The rotation center 112a of the inner bush 112 is at a position offset from the rotation center 111a of the outer bush 111 for setting the initial setting angle to the side clamped in the blade length direction in the state shown in FIG. By rotating the bush 112 counterclockwise in the figure, the tip 115a of the finishing blade 115 can be pressed against the coating base paper 104 on the backing roll 103 as shown in FIG. As a result, the finishing blade 115 is bent, and as a result, a force is generated to press the tip 115 a of the finishing blade 115 toward the surface of the backing roll 103. The force generated at the front end 115 a of the finishing blade 115 is approximately proportional to the rotation angle of the inner bush 112, and the gap between the front end 115 a of the finishing blade 115 and the surface of the coating base paper 104 on the backing roll 103 is between. The passing coating liquid film 109a can control the thickness of the coating liquid film 109a by changing the force generated at the tip 115a of the finishing blade 115. That is, in order to increase the thickness of the coating liquid film 109a, the rotation angle of the inner bush 112 is decreased. On the other hand, in order to decrease the thickness of the coating liquid film 109a, the rotation angle of the inner bush 112 is set. Should be increased. Therefore, after the start of coating, the thickness of the coating liquid film 109a can be controlled by rotating the inner bush 112 while fixing the rotation angle of the outer bush 111 for initial setting angle setting.
[0006]
[Problems to be solved by the invention]
However, in the above-mentioned conventional coating apparatus, since the eccentric amount of the eccentric bush 111 is determined, the applicable length of the finishing blade 115 is one type. On the other hand, the length of the finishing blade 115 to be applied is selected depending on the viscosity condition of the coating liquid, the coating speed range condition, and the like. In the conventional coating apparatus, when the above-described condition range is changed greatly, it is necessary to change the specification of the length of the finishing blade 115 to be applied, or to replace the eccentric bush 111 when the specification is changed.
[0007]
The present invention has been made in view of the above-mentioned conventional problems, and the purpose of the present invention is to apply a wide range of coating conditions that would necessitate replacement of the length type of the finishing blade 2 in the past. An object of the present invention is to provide a coating apparatus that can be coated with a finishing blade having at least two types of length specifications, and that can significantly reduce the work time spent for changing specifications in a finishing section.
[0008]
[Means for Solving the Problems]
To achieve the above object, the present invention provides a finishing blade that forms a coating liquid film by scraping off a transfer liquid film on the surface of a coating base paper, a header equipped with the finishing blade, and an inner side fixed to the header. In a coating apparatus comprising a bush and an outer bush that is rotatably attached to the outer side of the inner bush and has an eccentric shape, an intermediate bush is provided between the outer bush and the inner bush, and the inner bush and the header An eccentric shaft having an eccentric shape is provided between the intermediate bushing, the inner bushing, the eccentric shaft and the header so that they can be rotated together using a fastening member, while the fastening member is disposed at a position. By moving, the outer bush and the intermediate bush, and the inner bush, the eccentric shaft, and the header are configured to be rotatable integrally with each other, so that a finish blade having a plurality of blade lengths is formed. And to be able to mount the de.
According to the above mechanism, first, the intermediate bush, the inner bush, the eccentric shaft, and the header are fixed using the fastening member to be rotatable, and when the outer bush is rotated in this state, the outer peripheral surface of the outer bush is slid. It becomes a moving surface, and the angle of the finishing blade with respect to the coated base paper surface can be changed. Next, when the intermediate bush, inner bush, eccentric shaft and header arranged inside the outer bush are rotated together, the outer peripheral surface of the intermediate bush becomes a sliding surface, and the tip of the finishing blade is applied to the coated base paper surface. Can be pressed.
When installing finishing blades with different blade lengths, the outer bushing and intermediate bushing, and the inner bushing, eccentric shaft and header can be rotated together by moving the arrangement position of the fastening members. Can do. Furthermore, if only the eccentric shaft is rotated by a certain angle with the fastening member removed, finishing blades of a plurality of types of blade lengths can be mounted according to the magnitude of the rotation angle.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a coating apparatus according to the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, a paper roll 2 and a backing roll 3 are rotatably supported upstream of the coating apparatus 1, and a coating liquid recovery pan 4 is disposed below the backing roll 3. It is installed. An applicator nozzle 6 for discharging the coating liquid 5 is disposed in the coating liquid recovery pan 4 obliquely upward. A support arm 7 pivotally supported around the lower end portion is disposed on the side of the coating liquid recovery pan 4 and the applicator nozzle 6, and is disposed above the support arm 7. Is provided with a finishing portion 8 including a blade length adjusting portion and a header portion. Above the support arm 8, a plurality of paper rolls 9 and a hot air drying device 10 are disposed between the paper rolls 9.
[0010]
FIG. 2 shows an enlarged sectional view taken along line AA in FIG.
This figure corresponds to FIG. 8 showing a conventional example, the left side of the figure is a blade length adjusting part 11 provided on the support arm 7, and the right side of the figure is a header part 13 having a finishing blade 12. A finishing portion 8 is constituted by the blade length adjusting portion 11 and the header portion 13.
A circular hole 14 is formed in the support arm 7, and a plurality of bushes are rotatably supported in the hole 14. These bushes are the outermost outer bush 15, the intermediate bush 16 inside the outer bush 15, the inner bush 17 inside the intermediate bush 16, and the innermost eccentric shaft 18. The outer bush 15 and the inner bush 17 are both formed in a ring shape, and the outer bush 15 is different in the center of the circle formed by the inner peripheral surface 15a and the center of the circle formed by the outer peripheral surface 15b. It is formed on the eccentric bush. The intermediate bush 16 includes a ring portion 16a disposed between the outer bush 15 and the inner bush 17, and a disc-shaped mounting portion 16b integrally formed with the ring portion 16a. Like the bush 15, it is formed in an eccentric bush. The eccentric shaft 18 has an eccentric amount set to 5 mm, a central portion is hollowed out in a cylindrical shape, and is rotatably attached to a shaft portion 22 of a header 21 formed in a cylindrical shape.
[0011]
Further, bolt holes 23 are formed in the mounting portion 16 b and the inner bush 17 of the intermediate bush 16, and a tightening bolt 24 is screwed into these bolt holes 23, whereby the intermediate bush 16 and the inner bush 17. And are fixed. The inner bush 17 and the eccentric shaft 18 are also fixed by a locking pin 25 for preventing rotation, and a locking bolt 26 for preventing rotation is attached to the central portion of the eccentric shaft 18.
The rotation center line 15c of the outer bush 15 is set to substantially the same height as the tip 12a of the finishing blade 12, and the rotation center line 17c of the inner bush 17 is finished when the dimension of the finishing blade 12 is 76 mm. It is set so that it may become a fixed dimension from the front-end | tip 12a of the blade 12. FIG. When the outer bush 15 is rotated, the outer peripheral surface 15b is slidably rotated around the tip 12a and the rotation center 15c of the finishing blade 12, and an arbitrary angle that matches the cutting edge angle of the finishing blade 12 is set. Can be set. Next, when the inner bush 17 is rotated, the inner peripheral surface 15a is slid and rotated, and can be set to an arbitrary angle. The other sliding surfaces do not slide because the rotation is suppressed by the fastening bolts 24, the set bolts 26, and the set pins 25.
[0012]
The header portion 13 is provided with a concave portion 27 facing downward, and a solid bar holder 28 is disposed in the concave portion 27. As shown in FIG. 3, a pressing portion 29 protrudes from the upper portion of the solid bar holder 28 on the backing roll 3 side, and a lower end support portion 30 protrudes from the lower end portion. The finishing blade 12 formed of flexible spring steel or the like is attached while being sandwiched between the crank plate 31 and the lower end support portion 30 of the solid bar holder 28. The upper end 12 a of the finishing blade 12 is in contact with the surface of the coating base paper 32 wound around the backing roll 3 in a pressed state, and the upper end of the finishing blade 12 is slightly toward the flow direction of the coating base paper 32. Is curved.
[0013]
Next, the finishing portion 8 will be described with reference to FIG. 4 showing the header portion 13 which is a part of the finishing portion. The header portion 13 includes a head 21, which is a strength member, a solid bar holder 28, a clamp plate 31, clamp plate open / close tubes 41 and 42, a plate rotation pin 43, and a finishing blade 12. Among these, the solid bar holder 28 is fixed to the head 21, and the clamp plate 31 is attached to the head 21 with a rotation pin 43. The clamp plate 31 rotates about the rotary pin 43 by applying air pressure to one of the open / close tubes 41 and 42. The finishing blade 12 is fixed to the header portion 13 by the operation of the clamp plate 31. That is, the clamp plate 31 is released from the solid bar holder 28 by applying air pressure only to the upper tube 41 of the open / close tubes 41 and 42 in FIG. Insert between 28. After that, air pressure is applied only to the lower open / close tube 42 to press the clamp plate 31 against the solid bar holder 28, and the finishing blade 12 is clamped and fixed between the clamp plate 31 and the solid bar holder 28.
[0014]
The effect | action by the coating apparatus which has the said structure is demonstrated below including the manufacturing process of a coated paper.
First, as shown in FIG. 1, the coating liquid 15 is discharged from the applicator nozzle 6 onto the surface of the coating base paper 32 that runs around the backing roll 13, and the transfer liquid film 44 of about 150 to 250 μm is discharged. Form. As described with reference to FIG. 11, the transfer liquid film 44 is scraped off by the finishing portion 8 to become a coating liquid film 45 of about 5 to 20 μm. The coating base paper 32 having the coating liquid film 45 formed on the surface is supported by the paper roll 9 and sent to the plurality of hot air drying apparatuses 10 to become a dried coated paper.
Here, the operation of the header portion 13 when the coating liquid film 45 is formed will be described. When coating is not performed, such as during paper passing work or slow movement, the support arm 7 is rotated in a direction away from the backing roll 3 to be in a standby state, as indicated by a one-dot chain line in FIG. At the start of the coating operation, as shown by a solid line in FIG. 1, the support arm 7 is rotated and moved to the backing roll 3 side, and the finishing blade 12 is pressed against the coating base paper 32 wound on the backing roll 3. After that, the coating liquid 5 is discharged from the applicator nozzle 16 to start coating so that a prescribed transfer liquid film 44 is formed.
[0015]
Next, a procedure for replacing the finishing blade 12 having a different blade length will be described.
In the state shown in FIG. 2, the four members of the intermediate bush 16, the inner bush 17, the eccentric shaft 18, and the shaft portion 22 are integrally configured to be rotatable by the fastening bolt 24, the set bolt 26, and the set pin 25. The inner peripheral surface 15a is a sliding surface. On the other hand, the outer bush 15 has an outer peripheral surface 15b as a sliding surface.
First, the fastening bolt 24 that fixes the mounting portion 16b of the intermediate bush 16 and the inner bush 17 is removed, and the fastening position is set so as to fix the mounting portion 16b of the intermediate bush 16 and the outer bush 15 as shown in FIG. Move to the outer bush 15 side. As a result, the outer bush 15 and the intermediate bush 16 can rotate together, and rotate about the center line 15c with the outer peripheral surface 15b as a sliding surface. Further, the inner bush 17, the eccentric shaft 18, and the shaft portion 22 are integrally rotatable, and the outer peripheral surface 17b is a sliding surface.
Next, the set bolt 26 and the set pin 25 in FIG. 2 are removed, and the eccentric shaft 18 is rotated 180 degrees with a tool such as a spanner in this state, and then the set bolt 26 and the set pin 25 are attached to the eccentric shaft 18. As described above, the eccentric amount of the eccentric shaft 18 is set to 5 mm. Therefore, by rotating the eccentric shaft 18 by 180 degrees, the height of the header 21 is lowered downward by 10 mm. Therefore, the blade length is 86 mm. The finishing blade 46 can be mounted. As described above, according to the present invention, the two types of finishing blades 12 and 46 can be used by a simple operation.
[0016]
FIG. 6 is a graph showing the relationship between the pressing angle and the blade linear pressure when the finishing blades 12 and 46 having the blade lengths of 76 mm and 86 mm are used. Here, the blade linear pressure is a linear pressure generated at the tips 12 a and 46 a of the finishing blades 12 and 46, and the pressure angle means the rotation angle of the inner bush 17.
From this graph, it can be seen that by using two types of finishing blades 12 and 46 having a blade length of 76 mm and 86 mm, the range of linear pressure is expanded by about 30%. In particular, the 76 mm finishing blade 12 can be used for a high linear pressure range, and the 86 mm finishing blade 46 can be used for a low linear pressure range.
In the embodiment of the present invention, the finishing blades 12 and 46 having a blade length of 76 and 86 mm have been described as examples. However, the present invention is not limited to this and can be applied to finishing blades having other lengths. Is possible.
[0017]
【The invention's effect】
According to the coating apparatus of the present invention, finishing blades having different blade lengths can be exchanged in an extremely short time and with a small number of people as compared with conventional machines, thereby improving work efficiency and maintaining machine accuracy by recombination. Accordingly, the reliability of the device is improved.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing a paper coater of a coating apparatus according to the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
3 is a cross-sectional view taken along line BB in FIG.
FIG. 4 is a cross-sectional view showing a header portion of the coating apparatus according to the present invention.
FIG. 5 is a cross-sectional view showing a finishing portion when a finishing blade is changed.
FIG. 6 is a graph showing the relationship between blade linear pressure and pressure angle.
FIG. 7 is a conceptual diagram showing a part of a conventional coating apparatus.
8 is an enlarged cross-sectional view taken along the line CC in FIG.
9 is an enlarged sectional view taken along line DD of FIG.
10 is an enlarged cross-sectional view taken along the line DD of FIG. 8, showing a state in which the outer bush is rotated.
FIG. 11 is an enlarged cross-sectional view showing the flow of a transfer liquid film on the surface of a coated base paper.
12 is an enlarged cross-sectional view taken along line DD of FIG. 8, showing a state in which the inner bush is rotated.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coating apparatus 2 Paper roll 3 Backing roll 4 Coating liquid collection | recovery pan 5 Coating liquid 6 Applicator nozzle 7 Support arm 8 Finishing part 9 Paper roll 10 Hot air drying apparatus 11 Blade length adjustment part 12 Finishing blade 12a Tip 13 Header part 14 hole 15 outer bush 15a inner peripheral surface 15b outer peripheral surface 15c rotation center line 16 intermediate bush 16a ring portion 16b mounting portion 17 inner bush 17a inner peripheral surface 17b outer peripheral surface 17c rotation center line 18 eccentric shaft 21 head (header)
22 Shaft portion 23 Bolt hole 24 Fastening bolt 25 Set pin 26 Set bolt 27 Recess 28 Solid bar holder 29 Pressing portion 30 Lower end support portion 31 Crank plate 32 Coating base paper 41 Upper crank plate 42 Lower crank plate 43 Plate rotation pin 44 Transfer Liquid film 45 Coating liquid film 46 Finishing blade

Claims (1)

A finishing blade that forms a coating liquid film by scraping off the transfer liquid film on the surface of the coating base paper, a header equipped with the finishing blade, an inner bush fixed to the header, and rotatable to the outside of the inner bush In the coating device provided with an outer bush having an eccentric shape,
An intermediate bush is provided between the outer bush and the inner bush, an eccentric shaft having an eccentric shape is provided between the inner bush and the header, and the intermediate bush, inner bush, eccentric shaft and header are fastened. By using the member to rotate integrally, the arrangement position of the fastening member is moved, and the outer bush and the intermediate bush, and the inner bush, the eccentric shaft and the header are configured to be rotatable together, respectively. A coating apparatus characterized in that a finishing blade having a plurality of blade lengths can be mounted.

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