JP2002020990A - Method and apparatus for papermaking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a discontinuous paper body excellent in formation. SOLUTION: As shown in the figure, this papermaking apparatus 1 is composed of a stirring tank 2 and a papermaking part. The stirring tank 2 comprises a constitution obtained by attracting a raw material feed opening 50, an air nozzle 60 for stirring, a water spray nozzle 70 for washing and an outer cylinder 12 installed in a coaxial manner with a middle cylinder 11 to a top plate 10 integrally arranged with the middle cylinder 11. A seal 14 is fixed to the bottom end of the outer cylinder 12. One papermaking part 3 is constituted of a papermaking stand 15 holding a papermaking net 13 and having a suction hole 17 and a water suction hole 22, a cover 16 for recovering water leaked from the papermaking stand 15 and a central body 20 having an opening part 21. The cover 16 has an outlet opening 18. In carrying out papermaking, a fixed amount of water is supplied from the water suction hole 22, stored in the inside of the paper machine stand 15 and a space between the middle cylinder 11 and the outer cylinder 12 and air is jetted from the air nozzle 60 and water between the middle cylinder 11 and the outer cylinder 12 is stirred. In this state, a raw material diluted into a fixed concentration is thrown from the raw material feed opening 50 into the stirring tank, the stirring state is kept for about 30 seconds after the raw material is fed and papermaking is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a papermaking method and a papermaking apparatus for obtaining a dispersion of various fiber base materials and fillers in water to obtain a discontinuous paper body such as a ring. The present invention mainly relates to the production of raw paper which is an intermediate of a wet friction material used for a friction plate.

[0002]

2. Description of the Related Art An annular friction material used for a friction plate or the like is:
In the process before or after performing thermosetting by impregnating a thermosetting resin, it has been conventionally performed to punch a sheet of paper in a ring shape. However, such a manufacturing method has a low material yield. In recent years, a production method for producing raw paper in a ring shape has been developed. (See, for example, JP-A-2-912
94, JP-A-3-76780, JP-A-3-107628
Etc.).

[0003] On the other hand, when a discontinuous paper body is obtained, such as hand-made, there is also a problem that the formation deteriorates. As a method for improving this formation, Japanese Patent Application Laid-Open No.
241290 is disclosed.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a papermaking method in which the formation of a papermaking body is better than that of a conventional papermaking method. Its purpose is to provide a device.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a papermaking method in which the raw materials are charged uniformly above a papermaking net, a cylindrical outer cylinder, and an outer cylinder. A stirrer tank consisting of an inner cylinder arranged coaxially with the stirrer, an inlet for charging the raw material, a stirrer mechanism, and a top plate holding these members at predetermined positions, and a lower part of the stirrer tank In a papermaking apparatus provided with a netmaking machine and a papermaking unit having a central body having an opening connected to a suction device holding the netmaking machine, the feeding of the raw materials is made uniform. In addition, a papermaking apparatus in which the input port is arranged evenly above the net making machine, or a paper making apparatus in which the input port is staggered with respect to the center annular line of the net making, or a paper making apparatus or center in which the input port is directed to the outer peripheral surface of the middle cylinder Form the upper surface of the body into a substantially conical shape,
A papermaking apparatus or the like having an input port provided above the apex of the cone is obtained.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In a papermaking apparatus of the present invention, an outer cylinder, a middle cylinder, an air nozzle for stirring, a cleaning liquid injection mechanism, a raw material inlet, and the like are fixed to a top plate.

[0007] The above-mentioned inlets are arranged above the papermaking portion of the papermaking net or are arranged alternately with respect to the central annular line of the papermaking net. Alternatively, the inlet is arranged toward the outer peripheral surface of the inner cylinder. Alternatively, the central body of the papermaking table is formed in a substantially conical shape, and an inlet is provided above the apex. By feeding the raw material from the charging port arranged in this way, the bias of the raw material concentration before papermaking is eliminated and becomes uniform. In addition, the papermaking part of the net making is the part where the net is exposed between the outer cylinder and the central body,
That is, it refers to a portion where the paper body remains on the net after the paper making. The central body forms a central perforated portion of the annular paper body.

The inlet may be any one capable of charging the raw material, and the diameter of the injection port may be large enough to prevent clogging of the raw material. A fountain device is used for the cleaning liquid ejection mechanism. The fountain from the fountain device may be any of mist, polka dots, and lines, but it is preferable to install the fountain at a plurality of locations so that water can be sprayed uniformly on the entire inside of the stirring tank.

[0009]

1 is a top view of a first embodiment of a paper making apparatus according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a top view of a paper making section. The papermaking apparatus 1 includes a stirring tank 2 and a papermaking unit 3.
It consists of The stirring tank 2 is provided with a raw material inlet 50, a stirring air nozzle 60, a fountain nozzle 70 and an outer cylinder 12 on a top plate 10 made of aluminum or the like formed integrally with the middle cylinder 11.
It is constituted by attaching. A seal 14 is fixed to the lower part of the outer cylinder so that the raw material does not leak outside.

On the other hand, the papermaking section 3 has a papermaking table 15 that holds a papermaking network 13 and has a suction port 17, a cover 16 that collects moisture leaking from the papermaking table 15, and an opening 21 that communicates with the suction port 17. It is composed of a central body 20. Reference numeral 18 denotes an outlet of the cover 16.

As shown in FIG. 1, the raw material input port 50 and the air nozzle 60 are evenly arranged on an annular net. With such an arrangement, the raw material can be uniformly charged into the stirring tank, and the raw material concentration in the stirring tank can be made uniform immediately before papermaking.

FIGS. 4 and 5 are views showing the arrangement of the raw material inlets when the papermaking portion of the papermaking net 13 is viewed from above, and FIG. 4 shows, as shown in FIGS. 2 shows a state in which the paper making portions are equally arranged on the central annular line X.
FIG. 5 shows a state in which they are arranged alternately with respect to the center annular line X.

Next, the paper making method of the present invention using the apparatus shown as the first embodiment will be described. First, the stirring tank 2 and the paper making section 3 are combined as shown in FIG. (The separated state is shown in FIG. 6. FIG. 2 is a sectional view taken along the line AA in FIG. 1.
Although shown in a cross-sectional view, FIG. 6 is shown in a DD cross-sectional view of FIG. Then, a predetermined amount of water is supplied from the water inlet 22 and stored inside the paper making table 15 and between the middle cylinder 11 and the outer cylinder 12. Further, air is jetted from the air nozzle 60 to stir the water between the middle cylinder 11 and the outer cylinder 12.

A raw material diluted to a predetermined concentration is charged into the stirring state from a raw material charging port 50. After about 30 seconds have passed with the stirring state maintained after the introduction of the raw materials, papermaking is performed, and the water including the water of the raw materials is discharged to the suction port 17.
Then, a paper body is formed on the net 13. This papermaking may be performed while the stirring state is maintained, and may be performed after the stirring state is stopped during papermaking.

FIG. 6 shows a state in which the paper making apparatus 1 is separated into a stirring tank 2 and a paper making section 3, and the inside of the stirring tank 2 is further washed. (As described above, FIG. 6 is a sectional view taken along the line DD in FIG. 1). Washing is performed by fountain from the fountain nozzle 70 into the stirring tank 2. Fountain nozzle 7
0 is installed at a plurality of locations. This washing is performed as a separate step apart from the papermaking section 3.

FIG. 7 is a top view of the second embodiment, and FIG. 8 is a sectional view taken along the line BB of FIG. The difference from the first embodiment is that the raw material inlet 51 is provided on the side surface of the middle cylinder 11. 1 and 2 have the same basic configuration, and the same reference numerals denote the same parts. In the first embodiment shown in FIGS. 1 and 2, the space for the top plate is reduced because the raw material inlet 50, the air nozzle 60, and the fountain nozzle 70 are provided on the top plate 10. There is no particular problem as long as the diameter of the paper body to be made is large. However, when a paper body having a small diameter is obtained, the installation area on the top plate may be a problem.

With the configuration as in the second embodiment, such a problem can be solved and the number of the raw material inlets 51 and the air nozzles 60 can be increased, so that the raw material concentration can be made more uniform. Also becomes possible. In addition, the position of the raw material inlet 51 may be above or below the position of the water surface Y in the stirring tank 2 in advance. A slope 52 is provided on the bottom surface of the middle cylinder 11 so that the raw material does not remain. In addition, the material inlet 50 is also provided with an inclination in accordance with the inclination 52.

FIG. 9 is a top view of the third embodiment, and FIG.
It is CC sectional drawing of. 1 and 2 represent the same parts. The difference from the first and second embodiments is that an air nozzle for stirring is not attached to the top plate, but air is ejected from an air ejection hole 61 provided in the middle cylinder 11. The other configuration is the same as that of the first embodiment. In addition, although not shown, the inside of the stirring tank may be washed by fountain through a hole provided in the middle cylinder.

FIG. 11 is a top view of the fourth embodiment, and FIG. 12 is a cross-sectional view taken along the line EE of FIG. 11. In this embodiment, the front end 53 of the material inlet 50 faces the outer peripheral surface of the middle cylinder 11. Then, the input raw material flows down along the outer peripheral surface of the middle cylinder. Further, the lower end of the middle cylinder 11 is formed in a conical surface 19, and thus, even if there is one raw material input port, the raw material descends along the outer peripheral surface of the middle cylinder 11, and further lowers. Combined with the conical surface, the raw material is evenly put on the netting machine 13.

FIG. 10 is a sectional view of a fifth embodiment. In this embodiment, the upper surface of the central body 20 is formed in a substantially conical shape 54, and the material inlet 50 is provided above the vertex 54 of the cone. With this configuration, the raw material flows in the entire circumferential direction along the conical surface 54, and is uniformly charged on the papermaking net 13.

[0021]

The papermaking method and the papermaking apparatus of the present invention have the above-mentioned constitutions, and have an effect that a discontinuous papermaking body having excellent formation can be obtained.

[Brief description of the drawings]

FIG. 1 is a top view of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a top view of the papermaking section.

FIG. 4 is a diagram showing an arrangement of a material input port.

FIG. 5 is a view showing another arrangement of a material input port.

FIG. 6 is a diagram showing the paper making apparatus separated (DD in FIG. 1);
Cross section)

FIG. 7 is a top view of the second embodiment.

8 is a sectional view taken along line BB of FIG. 7;

FIG. 9 is a top view of the third embodiment.

10 is a sectional view taken along the line CC in FIG. 9;

FIG. 11 is a top view of the fourth embodiment.

FIG. 12 is a sectional view taken along line EE of FIG. 11;

FIG. 13 is a sectional view of a fifth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper-making apparatus 2 Stirring tank 3 Paper-making part 10 Top plate 11 Middle cylinder 12 Outer cylinder 13 Net-making 14 Seal 15 Paper-making stand 16 Cover 17 Suction port 18 Outlet 19 Conical surface 20 Center body 21 Opening 22 Water inlet 50 Material inlet 51 Raw material input port 52 Inclined 53 Input port tip 54 Conical surface 55 Apex 60 Air nozzle 61 Air ejection hole 70 Fountain nozzle

Claims (12)

[Claims] 1. A papermaking method for obtaining an annular papermaking, characterized in that the raw materials are charged evenly onto the papermaking net from an input port arranged above the papermaking net. 2. The papermaking method according to claim 1, wherein the raw material is charged from a plurality of inlets evenly arranged above the netting. 3. The papermaking method according to claim 2, wherein the input of the raw materials from the plurality of locations is performed from input ports arranged alternately with respect to a center annular line of a papermaking portion of the papermaking net. 4. The papermaking method according to claim 1, wherein the charging of the raw material is performed by crawling on a surface of a middle cylinder provided in the papermaking apparatus. 5. The papermaking method according to claim 1, wherein the charging of the raw material is performed toward a vertex of a conical portion of a central body having a substantially conical portion. 6. In the paper making method, a raw material having a predetermined concentration is charged into water in a stirring state, the stirring state is maintained for a certain time after the completion of the charging of the raw material, and then the raw material diluted with water is passed through a paper making net. The papermaking method according to any one of claims 1 to 5, wherein an annular papermaking body is obtained. 7. A cylindrical outer cylinder, a middle cylinder installed coaxially with the outer cylinder, an input port for inputting a raw material, a stirring mechanism, and these members in predetermined positions. A stirring tank consisting of the held top plate, and a papermaking section provided with a netting at the lower portion of the stirring tank, and a central body having an opening connected to the suction device and holding the netting. In the paper making apparatus provided with, the said inlet is arrange | positioned uniformly above the net making, The paper making apparatus characterized by the above-mentioned. 8. The papermaking apparatus according to claim 7, wherein the arrangement of the input ports is alternately arranged with respect to a center annular line of the papermaking net. 9. The papermaking apparatus according to claim 7, wherein the middle cylinder has a cylindrical shape. 10. The papermaking apparatus according to claim 7, wherein any one of an air supply hole for stirring, a material input port, and a cleaning liquid ejection port is provided on a side surface of the middle cylinder. 11. A cylindrical outer cylinder, a middle cylinder installed coaxially with the outer cylinder, a charging port for charging raw materials, a stirring mechanism, and holding these members at predetermined positions. A stirring tank consisting of a top plate and a papermaking section provided at the lower part of the stirring tank and provided with a netting, and a central body having an opening connected to the suction device and holding the netting. The papermaking apparatus provided, wherein the input port faces the outer peripheral surface of the middle cylinder. 12. A stirring tank comprising a cylindrical outer cylinder, a charging port for charging raw materials, a stirring mechanism, a top plate holding these members at predetermined positions, and a lower part of the stirring tank. There is provided a papermaking section having a papermaking net and a holding body that holds the papermaking net, has an opening connected to a suction device, and further has a central body whose upper surface is formed in a substantially conical shape. The papermaking apparatus according to claim 1, wherein the input port is provided above the vertex of the conical surface.