JP2001071316A - Manufacture of hydraulic inorganic molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the raw material loss and at the same time, make it possible to continuously manufacture a good molding without investing equipment cost by forming a part for receiving both side edge parts of a water-permeable sheet on the suction face of a suction means, of a waterpermeable member which is made of a raw material whose solid component is non-penetrable and communicates with a suction device. SOLUTION: The suction box 6 of a suction means 4 is equipped with a box body 6a and a water-permeable member 6b. On the suction face 62 side of the box body 6a, both edge parts 8 are notched by the thickness of the water- permeable member 6b from the center part 67 and a plurality of suction holes 63, 63' are pierced. The water-permeable member 6b is formed of the same material as a water-permeable sheet 2. In addition, leak barrier walls 66a, 66b are formed on both sides of the suction face 62 and an air hole 64 communicating with a decompression box 5 is formed on the bottom face side. Even when a molding raw material leaks from the edge of the water-permeable sheet 2, passage of the solid component is not allowed by providing the water- permeable member 6b and thus it is possible to prevent the raw material loss and air leakage into a vacuum from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a hydraulic inorganic molded article.

[0002]

2. Description of the Related Art As a method for continuously producing a hydraulic inorganic molded article, a method as disclosed in Japanese Patent Application Laid-Open No. Hei 6-297422 has already been proposed. That is, in this manufacturing method, on both sides of the water-permeable sheet moving from one side to the other with an endless leakage prevention belt moving at the same speed in the same direction as the water-permeable sheet, the water-permeable sheet is placed on the water-permeable sheet. A slurry-like forming material is supplied so that the forming material does not leak from both side edges of the water-permeable sheet, and the width of the product is regulated by a leak prevention belt.

However, in the above manufacturing method, when the tension of the leakage prevention belt is insufficient, the leakage prevention belt may meander, and the width of the product may become uneven, and when the position of the belt is shifted. , From the end face of the water-permeable sheet, into the suction means through the suction hole provided on the suction surface, the molding material enters, and material loss occurs, or the water-permeable sheet is formed by the molding material entering between the suction surface and the water-permeable sheet. The edge of
There is a possibility that vacuum leakage occurs and molding cannot be performed stably.

On the other hand, when a large tension is to be applied to the leakage prevention belt in order to prevent the leakage prevention belt from meandering, for example, a composite belt including an iron core is limited so as to withstand the large tension. It must be made of a material and use an expensive leakage prevention belt. In addition, the apparatus body also needs to have a strong structure that can withstand the large tension of the leakage prevention belt. Therefore, there is a problem that equipment cost is required.

[0005]

SUMMARY OF THE INVENTION In view of such circumstances, the present invention can reduce raw material loss and continuously produce good molded articles without increasing equipment costs. An object of the present invention is to provide a method for producing a hydraulic inorganic molded article.

[0006]

In order to achieve such an object, a method for producing a hydraulic inorganic molded article according to the present invention comprises forming a water-permeable sheet into a shape along one surface of a molded article to be molded. Having a large number of suction holes formed along the suction surface of the suction means and moving it from one side to the other side, and supplying a forming raw material onto the water-permeable sheet. In the method for producing a hydraulic inorganic molded article, wherein excess water in the forming raw material is decompressed and dewatered through a water-permeable sheet by suction means, at least both side edges of the suction surface of the suction means are provided. The receiving portion is formed of a water-permeable member that is impermeable to the solid component of the molding raw material and communicates with the suction device of the suction means provided below.

In the present invention, the water-permeable sheet is not particularly limited, but is formed of felt, nonwoven fabric, or the like.
It is preferable to form an endless belt. Further, the water-permeable sheet is not particularly problematic as long as it has a shape along the suction surface of the suction means at a portion where the forming raw material is supplied, but may be formed in advance in a shape along the suction surface of the suction means. .

[0008] The suction means is not particularly limited,
It is preferable that a suction box having a suction surface be connected endlessly via a chain or the like so as to move at the same speed as the water-permeable sheet.

The water-permeable member is not particularly limited as long as the solid component of the molding material is impermeable and has water permeability.
The same thing as a water-permeable sheet is preferable. Further, it is preferable that the water permeable member is integrated with the suction surface of the suction means.

[0010] The molding material may be any material used for producing a known hydraulic inorganic molded article such as a cement slurry.
There is no particular limitation.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described in detail with reference to the drawings. FIG. 1 shows an example of a manufacturing apparatus used to carry out the manufacturing method of the present invention.

As shown in FIG. 1, the manufacturing apparatus 1 includes a water-permeable sheet 2, a raw material supply device 3, a suction means 4,
The molded article F having a corrugated shape as shown in FIG. 2 can be formed. That is, the water-permeable sheet 2
Has an endless belt shape, and has a constant speed in a direction indicated by an arrow X in FIG. 1 via a drive roll 21 and a number of guide rolls 22.

Although not shown, the drive roll 21 and the guide roll 22 have a substantially gourd shape in which peaks and valleys are alternately arranged. Accordingly, the water-permeable sheet 2 is rotated in the direction of the arrow X by the driving force of the driving roll 21 while being shaped into a wave shape on one surface of the formed body F to be formed.

The suction means 4, as shown in FIG.
A decompression box 5 and a number of suction boxes 6 are provided. As shown in FIGS. 3 and 4, the suction box 6 includes a box body 6a and a water-permeable member 6b, and is connected to an endless belt via an annular chain (not shown). The sprockets 61, which are covered with, are rotated at the same speed in the same rotation direction as the water-permeable sheet 2 by being rotationally driven.

As shown in FIGS. 3 and 4, the box body 6a has its upper surface side, that is, the suction surface 62 side, at both end edges 68 in the width direction as compared with the central portion 67, the thickness of the water permeable member 6b. A large number of suction holes 63 and 63 ′ are formed in the central portion 67 and both end edges 68, respectively. The water-permeable member 6b is
It is formed of the same material as the water-permeable sheet 2 and is attached to both ends 68 of the box main body 6a so that the upper surface thereof and the upper surface thereof are substantially flush with each other, and is fixed to the box main body via an adhesive. ing.

When the suction box 6 is parallel to the upper parallel portion of the water-permeable sheet 2, the suction surface 62 of each suction box 6 comes into close contact with the lower surface of the water-permeable sheet 2 as shown in FIG. It has become. That is, as shown in FIG. 3, the suction surface 62 is formed on one side of the molded body formed by the water permeable member 6b which receives the central portion of the upper surface of the box body 6a and both side edges of the water permeable sheet 2 from below. It is formed in a shape following the wave shape.

The suction box 6 has leakage prevention walls 66a and 66b on both sides of the suction surface 62. Furthermore, on the bottom side of the suction box 6,
A vent hole 64 communicating with a decompression hole 51 of a decompression box 5 described later is provided.

On the other hand, as shown in FIG. 3, the decompression box 5 receives the suction box 6 from below, and has a decompression hole 51 provided on its upper surface. It is connected to decompression means such as a vacuum pump and a blower. That is, the suction means 4
When the suction box 6 is moved onto the decompression box 5 by the rotation drive of the sprocket 61 and the ventilation hole 64 communicates with the decompression hole 51, the inside of the suction box 6 is decompressed by the decompression from the decompression box 5, Suction holes 63, 63 'provided in surface 62
In addition, surplus moisture in the forming raw material 8 can be dehydrated under reduced pressure through the permeable sheet 2 via the permeable member 6B.

The raw material supply device 3 has a moving range W shown in FIG.
1 and 3, the raw material supply pipe 31, the developing rolls 33, 33, and the side plate (raw material outflow prevention plate). 36. Both rolls 33, 33
As shown in FIG. 3, is formed in a substantially gourd-shape so as to match the wave shape of the other surface of the molded body F to be molded, and rotates while the material supply device 3 reciprocates. It is designed to develop molding materials.

The raw material supply pipe 31 is provided with developing rolls 33, 33.
, So that the forming raw material fed from a raw material tank (not shown) can be supplied to the water permeable sheet 2 through the developing rolls 33. As shown in FIG. 3, the side plates 36 are disposed on the left and right so as to face both ends of the developing rolls 33, 33, and the leakage prevention walls 66 a, 66 of the suction box 6.
The lower end of b can be received.

Then, a formed plate F using this manufacturing apparatus 1
First, the water permeable sheet 2 and the suction box 6 are rotated in the same direction and at the same speed, and the pressure inside the pressure reducing box 5 is reduced by the pressure reducing means.

Next, the forming raw material 8 is supplied onto the water-permeable sheet 2 by the raw material supply device 3 reciprocating within the moving range W, and is developed and shaped by the developing rolls 33, 33, and at the same time, the excess The water is dehydrated through the water-permeable sheet 2 from the suction hole 63 or from the water-permeable member 6b and the suction hole 63 ', and the cross-sectionally corrugated developed and shaped article 81
Is continuously developed and formed. Then, the developed and shaped article 81 continuously shaped in this manner is cut into a predetermined length,
The molded body F is obtained by curing and curing.

In this manufacturing method, as described above, the surface of the portion of the suction surface 62 that receives both side edges of the water-permeable sheet 2 from below is formed by the water-permeable member 6b of the same material as the water-permeable sheet 2. Therefore, surplus moisture in the forming raw material 8 supplied to the central portion of the water permeable sheet 2 is dehydrated under reduced pressure through the suction holes 63 through the water permeable sheet 2, and is supplied to both edges of the water permeable sheet 2. Excess moisture in the formed molding material 8 is dehydrated under reduced pressure through the water permeable sheet 2 and the water permeable member 6b through the suction holes 63 '.

On the other hand, even when the water permeable sheet 2 meanders and its position is shifted in the width direction, and the forming material 8 leaks from the edge of the water permeable sheet 2, the forming material 8 is also Since the water-permeable member 2 is made of the same material as the water-permeable sheet 2, the solid component in the forming raw material 8 is not permeated, and is suction-dehydrated from the suction hole 63 'through the water-permeable member 6b. be able to.
Therefore, since the forming raw material 8 does not enter the suction box 6, the forming raw material 8 can be prevented from entering the suction box 6 to cause a raw material loss or a vacuum leak.

The molding raw material 8 is formed on both sides of the suction surface 62 so as to substantially contact both side edges of the water-permeable sheet 2 in the width direction.
, The meandering of the water-permeable sheet 2 is suppressed as much as possible. Therefore, it is possible to continuously produce a molded product of stable quality.

Further, the water permeable member 6b is connected to the box body 6
Since it has a simple structure that is simply provided integrally with the component a, the molded body F can be manufactured without increasing the facility cost.

The method for producing a hydraulic inorganic molded article according to the present invention is not limited to the above embodiment. For example,
In the above embodiment, the corrugated shaped body is manufactured, but the surface on the water-permeable sheet side may be flat and the developing roll side may have another shape such as an uneven shape. In the above embodiment, the water-permeable member receives only the both edge portions of the water-permeable sheet, but the water-permeable sheet may be received from below over the entire surface.

[0028]

Embodiments of the present invention will be described below in detail.

(Example 1) The moving speed of the water-permeable sheet was measured using the manufacturing apparatus 1 shown in FIG. 1 equipped with a substantially gourd-shaped developing roll having a maximum diameter portion having a diameter of 200 mm and a minimum diameter portion having a diameter of 100 mm. Is 1 m / min, the moving speed of the raw material supply device is 4 m / min in the moving direction of the water permeable sheet, 2 m / min in the direction opposite to the moving direction of the water permeable sheet, and the degree of vacuum during molding in the decompression box 5 is 450 mmHg. And the developing roll is rotated forward in the direction of relative movement of the water-permeable sheet so that the peripheral speed of the minimum diameter portion of the development roll is the same as the relative movement speed of the water-permeable sheet. Was continuously molded, the molding material did not enter the suction box even if the water-permeable sheet was shifted, and the degree of vacuum was 450 mm.
It was almost stable to Hg.

(Comparative Example 1) In the same manner as in Example 1 except that no water-permeable member was provided. When the molded body was continuously formed, the molding material wrapped around the suction surface side from the edge of the water-permeable sheet, a part of the material entered the suction box, and material loss occurred. It fluctuated between 400 mmHg.

[0031]

As described above, the method for producing a hydraulic inorganic molded article according to the present invention can reduce a raw material loss and provide a good molded article without increasing equipment costs. It can be manufactured continuously.

[Brief description of the drawings]

FIG. 1 is a side view illustrating an example of a production apparatus used for a method for producing a hydraulic inorganic molded article according to the present invention.

FIG. 2 is a perspective view of a molded body obtained by the manufacturing apparatus of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is an enlarged view of a main part of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 2 Water permeable sheet 3 Raw material supply apparatus 33 Deployment roll 4 Suction means 5 Decompression box 6 Suction box 6a Box main body 6b Water permeable member 62 Suction surface 63, 63 'Suction hole 8 Molding raw material F Molded body

Claims (1)

[Claims] 1. A water-permeable sheet having a shape along one surface of a molded article to be formed, and a state in which a plurality of suction holes are formed along a suction surface of a suction means, from one side. Hydraulic inorganic molding that is moved toward the other side and supplies the forming raw material on the permeable sheet, and excess water in the supplied forming material is dehydrated under reduced pressure through the permeable sheet by suction means. In the method for manufacturing a body, at least a portion of the suction surface of the suction means for receiving both side edges of the water-permeable sheet is impervious to a solid component of a molding raw material and communicates with a suction device of the suction means provided below. A method for producing a hydraulic inorganic molded article, characterized by being formed of a hydraulic member.