JP3312841B2 - Slurry feeder for inorganic plate production - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slurry supply apparatus for producing an inorganic plate, which is used mainly for producing an inorganic plate used for an outer wall material, a roofing material or the like by forming a hydraulic material.

[0002]

2. Description of the Related Art Various types of slurry supply apparatuses have been proposed and used in the paper making of inorganic plates. Generally, a type in which slurry flows out from a slit in the front of a box-shaped hopper is used. Have been. Recently, a type having no hopper bottom has been proposed as shown in JP-A-7-266322.

The structure disclosed in Japanese Patent Application Laid-Open No. 7-266322 is schematically formed into a structure shown in FIG. That is, a hopper 2 that opens the lower end is disposed on the filter cloth 1 of the papermaking machine, and a slurry outlet 3 is provided between the lower end of the hopper 2 and the filter cloth 1 in the traveling direction A of the filter cloth 1. The hopper 2 is provided in a portion other than the slurry outlet 3 side.
A flexible skirt plate 4 is attached to the lower end of the
The lower end of the skirt plate 4 is in contact with the filter cloth 1. The skirt plate 4 is perpendicular to the filter cloth 1.

[0004]

However, Japanese Patent Application Laid-Open No.
No. 266322 discloses a hopper 2
When the slurry 5 is supplied to the filter cloth 1 and the skirt plate 4
There is a problem that the slurry is likely to leak from between the two. That is, since the skirt plate 4 is oriented in a direction perpendicular to the filter cloth 1, the slurry 5 receives a force to spread outward by the pressure of the slurry 5, and the slurry 5 easily leaks as shown by an arrow B in FIG.
This tendency is particularly large in the skirt plates 4 on both sides in the direction parallel to the traveling direction A of the filter cloth 1.

The present invention has been made in view of the above description, and has as its object to prevent slurry from leaking from between a filter cloth and a skirt plate.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a slurry supply apparatus for producing an inorganic plate according to the present invention comprises a hopper having a lower end opened above a filter cloth 1 of a paper machine such as a fourdrinier paper machine. 2, a slurry outlet 3 for discharging the slurry 5 is provided between the lower end of the hopper 2 and the filter cloth 1 on the traveling direction A of the filter cloth 1 in the four peripheral edges at the lower end of the hopper, and the slurry outlet 3 is provided. A flexible skirt plate 4 whose lower end is in contact with the filter cloth 1 is provided at the lower end of the hopper 2 at the other three edges, and the skirt plate 4 prevents the slurry 5 from flowing out while the slurry flows out of the slurry outlet 3. In order to prevent the slurry 5 from leaking from the skirt plate 4 due to the movement of the filter cloth 1, the skirt plates 4 at the three edges should not go at a right angle to the filter cloth 1 but go inward toward the lower end. Tilt inward It was characterized by comprising. In this case, since the skirt plate 4 is not perpendicular to the filter cloth 1 but is inclined inward so as to go inward toward the lower end,
When the slurry 5 is put into the hopper 2, the pressure of the slurry 5 acts to press the skirt plate 4 against the filter cloth 1, and it is possible to reliably prevent the slurry 5 from leaking.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 shows a fourdrinier machine as an example of a machine for manufacturing an inorganic plate by papermaking. A filter cloth 1 such as felt is suspended between the front and rear rollers 6 so that the filter cloth 1 is fed in the traveling direction A. A suction box 7 for performing suction dehydration is provided on the lower surface side of the filter cloth 1 between the front and rear rollers 6. A slurry supply device mainly composed of a hopper 2 is disposed above a rear portion of the filter cloth 1 opposite to the traveling direction A, and a pressurizing device is disposed above a front portion of the filter cloth 1. is there. In this pressure device, an endless strip-shaped release film 8 is suspended around a plurality of rollers 11, and a pressure roll 9 is arranged inside the endless strip-shaped release film 8. The release film 8 is formed of a polyethylene film, a polypropylene film, a fluorine-based resin film, or the like.

The hopper 2 of the slurry supply device has an open lower end, and is disposed above the filter cloth 1. Hopper 2
Between the edge of the lower end of the four peripheral edges on the side of the filter cloth 1 in the traveling direction A and the filter cloth 1, there is a slurry outlet 3 through which the slurry 5 flows out. A flexible skirt plate 4 is attached to the edge. The skirt plate 4 is made of hard rubber or the like, and the lower end of the skirt plate 4 is elastically contacted with the filter cloth 1. This skirt plate 4 is not in a direction orthogonal to the filter cloth 1 as shown in FIG.
It is inclined inward so that it goes inward at the bottom. That is, the lower end of the hopper 2 is provided so that the inclined mounting edge 12 is folded back, and the upper part of the skirt plate 4 is attached to the inclined mounting edge 12 so that the skirt plate 4 is inclined.

When the slurry 5 is put into the hopper 2 and the filter cloth 1 is driven in the traveling direction, the slurry 5 flows out from the slurry outlet 3 and the green sheet 10 is continuously formed. When the green sheet 10 is conveyed by the filter cloth 1, the green sheet 10 is sucked from the suction box 7 to be dehydrated and pressed by the pressure roll 9 via the release film 8. When the slurry 5 is put into the hopper 2,
Since the skirt plate 4 is inclined inward, the pressure from the slurry 5 acts as shown by the arrow C in FIG. 1, and a force acts in the direction of pressing the lower end of the skirt plate 4 against the filter cloth 1. The slurry 5 does not leak from between the filter cloth 4 and the filter cloth 1.

Further, the skirt plate 4 is attached to the filter cloth 1 as in the prior art.
The following results were obtained by comparing the performance when the skirt plate 4 was provided at a right angle with the skirt plate 4 as in the present invention. In other words, Portland cement 1
00 parts by weight, fly ash 100 parts by weight, silica stone powder 4
0 parts by weight, 20 parts by weight of NUKP pulp, and a slurry having a concentration of 15% by weight in a hopper having a height of 20 cm to 70%.
cm and a paper machine (width of 50 cm, felt speed of 5 m / min). It was performed with a sloped one. As a result,
In the case of the conventional structure, the leakage of the slurry 5 occurred on both sides parallel to the traveling direction of the filter cloth 1, but in the case of the structure of the present invention, almost no leakage was observed.

[0011]

As described above, in order to prevent the slurry from leaking from the skirt plate due to the movement of the filter cloth, the present invention tilts the skirt plate inward so as not to be at a right angle to the filter cloth but to go inward toward the lower end. Therefore, when the slurry is put into the hopper, the pressure of the slurry acts to press the skirt plate against the filter cloth, thereby reliably preventing the slurry from leaking and eliminating various adverse effects caused by the slurry leaking. It is.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an example of an embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the entire papermaking apparatus.

FIG. 3 shows a conventional example, in which (a) is a cross-sectional view seen from the front,
(B) is a sectional view seen from the side.

[Explanation of symbols]

 Reference Signs List 1 filter cloth 2 hopper 3 slurry outlet 4 skirt plate 5 slurry

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B28B 13/02 B28B 5/02 B29C 31/02

Claims (1)

(57) [Claims] [Claim 1] Place the hopper opening to the lower end filter cloth above the papermaking machine such as length network type papermaking machine, the lower end of the hopper four
A slurry outlet for discharging slurry is provided between the lower end of the hopper and the filter cloth on the side of the filter cloth in the peripheral direction, and the lower end contacts the filter cloth at the lower end of the hopper at three edges other than the slurry outlet. To provide a flexible skirt plate,
In the slurry supply device for manufacturing an inorganic plate, in which the slurry flows out from the slurry outlet while preventing the slurry from flowing out by the skirt plate, the skirt plate having the above three edges is used to prevent the slurry from leaking from the skirt plate due to the movement of the filter cloth. Characterized by being inclined inward so as to go inward toward the lower end rather than at a right angle to the filter cloth, respectively .