JP2002020991A - Method and apparatus for papermaking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a ring-shaped paper body excellent in formation. SOLUTION: This papermaking apparatus 1 is composed of a stirring tank 2 and a papermaking stand 3. The stirring tank 2 is constituted of a middle cylinder 11 having an approximately conical part 22 at the bottom end, an outer cylinder 23 coaxial with the middle cylinder, a raw material feed opening 24, plural air nozzles 25 being a stirring mechanism and a water spray nozzle 28 for jetting washing water supported on a top plate 26. The papermaking part 3 is constituted of a papermaking stand 32, a papermaking net 31 attached to the top of the papermaking stand, an outside cover 34, etc. A sealing 27 is fixed to the bottom end of the stirring tank 2. In the figure, a water hole 38 for supplying water, a water suction hole 33, an outlet opening 35, a central body 45 and an opening 46 are shown. In carrying out papermaking, a fixed amount of water is supplied from the water hole 38 through the opening 46 into the inside of the paper machine stand 32 and a space between the middle cylinder 21 and the outer cylinder 23 and air is jetted from the air nozzle 25 and water between the middle cylinder 21 and the outer cylinder 23 is stirred. In this stirring state, a raw material diluted into a fixed concentration is thrown from the raw material feed opening 24 into the stirring tank 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 making a dispersion of various fiber base materials and fillers in water, and more particularly to an intermediate of a wet friction material used for a friction plate. And the production of raw paper.

[0002]

2. Description of the Related Art An annular friction material used for a friction plate or the like is:
Before or after performing thermosetting by impregnating a thermosetting resin, in the process of punching a sheet of paper into a ring, it has been conventionally performed, but in recent years due to poor material yield in this method, A method of making raw paper into a ring has been developed. (For example, see JP-A-2-91294 and 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 of improving this formation, Japanese Patent Application Laid-Open No. 11-2
41290 is disclosed.

[0004]

In the conventional papermaking method and papermaking apparatus for producing a discontinuous papermaking body such as an annular body, the formation of the papermaking body was not always satisfactory.
An object of the present invention is to provide a papermaking method and a papermaking apparatus for obtaining a discontinuous papermaking body having a better texture than conventional ones.

[0005]

According to the present invention, there is provided a papermaking method for obtaining a discontinuous papermaking body, comprising the steps of:
A papermaking method characterized by obtaining a discontinuous paper body by passing the raw material diluted in water through a net while maintaining the stirring state for a certain period of time after the completion of charging of the raw materials, and further maintaining the stirring state. A cylindrical outer cylinder, a middle cylinder installed coaxially with the outer cylinder, an inlet for charging raw materials, a stirring mechanism, and a ceiling holding the outer cylinder and the middle cylinder at predetermined positions. A papermaking apparatus provided with a stirring tank consisting of a plate and a papermaking section comprising a papermaking net, and a papermaking table having an opening connected to a suction device holding the papermaking net and provided at a lower portion of the stirring tank. , A papermaking apparatus characterized in that the stirring mechanism is uniformly arranged above the netting.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A papermaking apparatus according to the present invention has a structure in which an outer cylinder, a middle cylinder, an air nozzle for stirring, a cleaning liquid injection mechanism, and a raw material input port are fixed to a top plate. The air nozzles are arranged evenly above the central annular line of the papermaking portion of the papermaking net or alternately with respect to the central annular line. If the air nozzles are evenly arranged without being biased above the papermaking part of the papermaking net, the formation is improved. Therefore, it is preferable to arrange the openings for injecting the air so that the directions of the openings are uniform without being biased.

[0007] Further, the thickness of the papermaking body can be made uniform by making the middle cylinder substantially conical and providing the above-mentioned raw material input port above the vertex of the substantially conical portion. Further, a fountain device is used for the cleaning liquid injection mechanism. The fountain from the fountain device may be in the form of a mist, polka dots, or a line.

[0008]

1 is a top view of an embodiment of the apparatus of the present invention, FIG. 2 is a sectional view of the same, FIG. 3 is a top view of a paper making section, and the paper making apparatus 1 comprises a stirring tank 2 and a paper making section 3. It consists of The stirring tank 2 has a substantially conical portion 22 at the lower end.
, An outer cylinder 23 concentric with the middle cylinder, a raw material input port 24, an air nozzle 25 serving as a stirring mechanism, and an injection port 28 for injecting water for cleaning the middle cylinder 21 and the outer cylinder 23. It is configured to be fixed to an aluminum top plate.
A seal ring 27 is fixed to the lower end of the outer cylinder 23.

The paper making section 3 has a structure in which a net making net 31 is attached to an upper surface of a paper making table 32, and a cover 34 for collecting moisture such as spilled raw materials is provided outside the paper making net 31. FIG.
Shows a top view of the papermaking unit 3. 38 is a water inlet, 33
Denotes a water suction port, 35 denotes a discharge port of the cover 34, 45 denotes a central body, and 46 denotes an opening.

The illustrated apparatus forms an annular paper body as a discontinuous paper body, and a center body 45 forms a central perforated portion of the paper body.

FIG. 4 shows the apparatus shown in FIG. 1 and FIG.
FIG. 5 and FIG. 6 show a state in which a stirring tank 2 and a paper making section 3 are separated from each other.
It is a top view which shows the example of arrangement of 5.

As shown in FIG. 4, the stirring tank 2 is separated from the paper making section 3 and washed at another place to remove dirt attached to the inner wall of the outer cylinder 23 and the outer wall of the middle cylinder 21.

In FIGS. 5 and 6, X is a central annular line of the papermaking portion of the papermaking 31. In FIG. 5, the air nozzles 25 are evenly arranged on the central annular line X, and in FIG. An example is shown. With such an arrangement, the raw materials in the stirring tank 2 can be uniformly stirred, and the formation of the paper body can be improved.

Next, the paper making method of the present invention using the apparatus shown as an embodiment will be described. First, the stirring tank 2 and the paper making section 3 are combined as shown in FIG. Then, if a predetermined amount of water is supplied from the water supply port 38, the water passes through the opening 46, and the inside of the papermaking table 32 and the middle cylinder 21 and the outer cylinder 23
Accumulate between Further, air is jetted from the air nozzle 25 to stir the water between the middle cylinder 21 and the outer cylinder 23.
Raw materials diluted to a predetermined concentration are charged from the raw material charging port 24 into the stirring state. After several tens of seconds elapse while the stirring state is maintained even after the input of the raw materials, papermaking is performed, and the water (including the water in the raw materials) is sucked and discharged from the suction port 33. Then, a papermaking body is formed on the netting net 31.

[0015]

The present invention relates to a papermaking method and a papermaking apparatus as described above, and it has become possible to obtain an annular papermaking body having excellent formation.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of FIG.

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

FIG. 4 is a diagram showing a separation state of a stirring tank and a paper making section.

FIG. 5 is a top view showing an arrangement example of a stirring mechanism.

FIG. 6 is a top view showing another arrangement example of the stirring mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper-making apparatus 2 Stirring tank 3 Paper-making part 21 Middle cylinder 22 Conical part 23 Outer cylinder 24 Raw material input port 25 Air nozzle 26 Top plate 27 Sealing 28 Water injection port 31 Paper net 32 Paper-making stand 33 Suction port 34 Cover 35 Discharge port 38 Water supply port 45 Center body 46 Opening 51 Middle cylinder

Claims (10)

[Claims] In a paper making method for obtaining a discontinuous paper body, a raw material having a predetermined concentration is added to water in a stirring state, and after the charging of the raw material is completed, the stirring state is maintained for a certain period of time. A papermaking method characterized by obtaining a discontinuous papermaking body by passing a raw material diluted with water through a papermaking net while maintaining the same. 2. The papermaking machine according to claim 1, wherein said papermaking body is a discontinuous annular body, and said stirring state is generated by a plurality of stirring mechanisms evenly arranged above said netting. 2. The papermaking method according to 1. 3. The papermaking method according to claim 2, wherein the stirring state is generated by a stirring mechanism alternately arranged with respect to a center annular line of a papermaking portion of the papermaking net. 4. The method according to claim 1, wherein the stirring mechanism is an air nozzle, and the stirring of the raw material is performed by air ejected from the air nozzle.
The papermaking method according to any one of the above. 5. The papermaking method according to claim 1, wherein the stirring in the stirring tank is performed after the papermaking in the papermaking method. 6. The papermaking method according to claim 1, wherein in the papermaking method, washing of the stirring tank is performed before water and raw materials are charged. 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, a stirring tank comprising a top plate holding the outer cylinder and the middle cylinder and the like in a predetermined position is provided, and at the lower part of the stirring tank, a net-making net and the net-holding net are connected to a suction device. A papermaking apparatus provided with a papermaking section comprising a papermaking table having an opening, wherein the stirring mechanism is arranged uniformly above the papermaking net. 8. The papermaking apparatus according to claim 7, wherein the equally arranged stirring mechanisms are alternately arranged with respect to a center annular line of a papermaking portion of the papermaking net. 9. The papermaking apparatus according to claim 7, wherein the stirring mechanism is an air nozzle. 10. The cleaning device according to claim 7, wherein a cleaning liquid spraying mechanism is provided on the top plate.
Item 6. The papermaking apparatus according to Item 1.