JP2000210918A - Manufacture of hydraulic inorganic molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the stable supply of a molding raw material even when the length of a pre-supply hopper is made larger and continuously manufacture a molded product of stable quality by forming a part right above a gap in the wall of the pre-supply hopper using a rotary roll of such a shape s extending along one of the faces of the molded product. SOLUTION: A molding raw material 8 is preliminarily supplied, in the sectional shape of a gap, to the surface of a water-permeable sheet (TS) 2 immediately before a vacuum dehydration region V using a pre-supply hopper 92 and thus is always kept in a constant supply state in the vacuum dehydration region V, so that the internal pressure of a vacuum box 5 is stably kept at a reduced pressure level. The molding raw material 8 packed in the hopper 9a is previously stirred by a stirring blade 94 in the pre-supply hopper 9a and is carried to the wall side of the rear part of the hopper 9a following the movement of the TS 2. The raw material 8 which is not used for pre-supply is again returned to the wall side of the forward part to eliminate accumulation of the residual molding raw material 8 on the wall side of the rear part. Thus it is possible to ensure the stable pre-supply of the raw material 8 and continuously manufacture a molded product of a plain shape and even molded product of an uneven profile such as corrugated.

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 producing a hydraulic inorganic molded article, at least in a decompression dehydration region where the pressure of the suction means is reduced, a suction surface of a suction means having a shape along one surface of the molded article to be molded is formed. While moving the water permeable sheet from one side to the other side, while moving the raw material supply device provided with the two developing rolls in parallel in the traveling direction of the water permeable sheet in the decompression dewatering area, The forming material is supplied onto the permeable sheet from between the developing roll and the developing roll, and the supplied forming material is formed into a gap between the developing roll and the permeable sheet by the two developing rolls. Japanese Unexamined Patent Publication No. 6-29 discloses a method of dehydrating excess moisture in a molding raw material under reduced pressure through a water-permeable sheet by suction means.
No. 7422 and Japanese Patent Application Laid-Open No. 9-48014, which have already been proposed.

[0003] That is, according to the above manufacturing method, the water-permeable sheet is continuously moved, and the material is formed on the water-permeable sheet while being spread and formed by a developing roll. There is an advantage that a plate-shaped hydraulic inorganic molded article having a corrugated shape or the like can be continuously produced.

However, in the case of the above-described manufacturing method, the water-permeable sheet moves continuously in one direction, and the raw material supply device reciprocates in the traveling direction of the water-permeable sheet. When the raw material supply device is moving in the direction of travel of the water permeable sheet, there is a case where no forming raw material is supplied on the water permeable sheet approaching the start end of the reduced pressure dewatering region. Therefore, the outside air directly enters the suction means side through the water permeable sheet from the water permeable sheet portion where the molding raw material is not supplied, and the degree of vacuum of the suction means is temporarily reduced, which partially causes poor dehydration. There is a risk of inviting.

Therefore, while the raw material supply device is moving in the traveling direction of the water permeable sheet, the raw material supply is always performed on the water permeable sheet that has reached the reduced pressure dewatering area so that the raw material is supplied. A method is conceivable in which the range of movement of the device is widened such that the end on the rear side in the traveling direction of the water-permeable sheet is on the front side into the decompression dewatering region. However, this method has the following problems particularly when it is desired to obtain a molded article having a corrugated plate-like unevenness as in the production method of Japanese Patent Application Laid-Open No. 9-48014.

That is, in the case of the manufacturing method disclosed in Japanese Patent Application Laid-Open No. 9-48014, since the developing roll has a cross-sectional shape along the uneven shape and the forming raw material has fluidity, the raw material supply device When the forming material is supplied onto the water permeable sheet just before the water permeable sheet reaches the reduced pressure dewatering area, the forming material flows to the valley side of the unevenness before entering the reduced pressure dewatering area. Therefore, in a state where the molding raw material is excessively supplied to the valley side of the unevenness, dehydration is directly performed under reduced pressure in the reduced pressure dehydration region, and a molded body having a uniform thickness cannot be obtained.

Accordingly, the inventors of the present invention have proposed a pre-supply hopper having a substantially cylindrical shape for forming materials, and the lower end faces of the three walls except for the wall on the moving direction side of the water permeable sheet have the water permeable sheet and And / or arranged so as to be substantially in contact with the edge of the suction means, and a gap serving as a preliminary supply port is provided at the lower end of the wall on the moving direction side of the water-permeable sheet, and this gap faces the start end of the reduced-pressure dewatering area. In this state, the forming raw material filled in the hopper is continuously preliminarily supplied onto the water-permeable sheet in the form of a gap from the gap, and then formed on the preliminarily supplied forming raw material by the raw material supply device. We thought that the above problem could be solved by supplying the raw materials.

However, in the above method, if the length of the preliminary supply hopper is to be increased in the direction of movement of the water permeable sheet, the forming material in the preliminary supply hopper is placed on the water permeable sheet. With the movement of the sheet, it is successively carried toward the wall on the moving direction side of the water permeable sheet,
There is a problem in that it cannot be stably supplied at the wall and cannot be stably supplied.

[0009]

SUMMARY OF THE INVENTION In view of such circumstances, the present invention makes it possible to preliminarily supply a molding material onto a water-permeable sheet in a stable state even if the length of a preliminary supply hopper is increased. Production of hydraulic inorganic molded articles that can continuously produce molded articles of stable quality, not only flat molded articles, but also molded articles having irregularities such as corrugated sheets. It is intended to provide a way.

[0010]

In order to achieve such an object, a method for producing a hydraulic inorganic molded article according to the invention of claim 1 (hereinafter referred to as a "production method of claim 1").
The water-permeable sheet has a shape along one surface of a molded body to be molded, and goes from one side to the other side along a suction surface of suction means in which a number of suction holes are formed. And a pre-supply hopper for forming material having a substantially cylindrical shape. The lower end faces of the three walls except for the wall on the moving direction side of the water permeable sheet are formed at the edges of the water permeable sheet and / or suction means. A gap is provided at the lower end of the wall on the moving direction side of the water-permeable sheet as a preliminary supply port, and is filled in the hopper with the gap facing the start end of the decompression and dehydration area. The raw material supply device in which the formed forming material is continuously preliminarily supplied onto the water-permeable sheet in the form of a gap from the gap, and then two developing rolls are provided in parallel in the moving direction of the water-permeable sheet, Transfer of permeable sheet While reciprocating in the direction, further supply the forming raw material onto the pre-supplied forming raw material from between the developing roll and the developing roll, the supplied forming raw material by both developing rolls, a developing roll, a water-permeable sheet and A method for producing a hydraulic inorganic molded article, which is designed to expand and shape into a gap shape, and to dehydrate excess water in a molding raw material under reduced pressure through a suction hole through a water-permeable sheet by suction means, A portion immediately above the gap of the wall where the gap of the preliminary supply hopper is formed is formed by a rotating roll having a shape substantially along the other surface of the molded product to be obtained, and is filled in the preliminary supply hopper at the time of preliminary supply. The formed molding material was stirred by stirring means.

A method for producing a hydraulic inorganic molded article according to the invention of claim 2 (hereinafter referred to as “production method of claim 2”)
The water-permeable sheet has a shape along one surface of a molded body to be molded, and goes from one side to the other side along a suction surface of suction means in which a number of suction holes are formed. And a pre-supply hopper for forming material having a substantially cylindrical shape. The lower end faces of the three walls except for the wall on the moving direction side of the water permeable sheet are formed at the edges of the water permeable sheet and / or suction means. A gap is provided at the lower end of the wall on the moving direction side of the water-permeable sheet as a preliminary supply port, and is filled in the hopper with the gap facing the start end of the decompression and dehydration area. The raw material supply device in which the formed forming material is continuously preliminarily supplied onto the water-permeable sheet in the form of a gap from the gap, and then two developing rolls are provided in parallel in the moving direction of the water-permeable sheet, Transfer of permeable sheet While reciprocating in the direction, further supply the forming raw material onto the pre-supplied forming raw material from between the developing roll and the developing roll, the supplied forming raw material by both developing rolls, a developing roll, a water-permeable sheet and A method for producing a hydraulic inorganic molded article, which is designed to expand and shape into a gap shape, and to dehydrate excess water in a molding raw material under reduced pressure through a suction hole through a water-permeable sheet by suction means, The portion immediately above the gap of the wall where the gap of the preliminary supply hopper is formed is formed by a rotating roll having a shape substantially along the other surface of the molding to be obtained, and approaches the water-permeable sheet in the rotating roll direction. The forming material guide plate of the forming material filled in the pre-supply hopper which is inclined so as to reach the vicinity of the rotating roll is provided in the hopper.

[0012] A method for producing a hydraulic inorganic molded article according to the invention of claim 3 (hereinafter referred to as "production method of claim 3").
The water-permeable sheet has a shape along one surface of a molded body to be molded, and goes from one side to the other side along a suction surface of suction means in which a number of suction holes are formed. And a pre-supply hopper for forming material having a substantially cylindrical shape. The lower end faces of the three walls except for the wall on the moving direction side of the water permeable sheet are formed at the edges of the water permeable sheet and / or suction means. A gap is provided at the lower end of the wall on the moving direction side of the water-permeable sheet as a preliminary supply port, and is filled in the hopper with the gap facing the start end of the decompression and dehydration area. The raw material supply device in which the formed forming material is continuously preliminarily supplied onto the water-permeable sheet in the form of a gap from the gap, and then two developing rolls are provided in parallel in the moving direction of the water-permeable sheet, Transfer of permeable sheet While reciprocating in the direction, further supply the forming raw material onto the pre-supplied forming raw material from between the developing roll and the developing roll, the supplied forming raw material by both developing rolls, a developing roll, a water-permeable sheet and A method for producing a hydraulic inorganic molded article, which is designed to expand and shape into a gap shape, and to dehydrate excess water in a molding raw material under reduced pressure through a suction hole through a water-permeable sheet by suction means, Immediately above the gap of the wall where the gap is formed in the preliminary supply hopper is formed by a rotating roll having a shape substantially along the other surface of the molded product to be obtained, and the level of the molding material in the preliminary supply hopper is adjusted to this level. The rotation roll was maintained between the rotation center axis and the lower end of the minimum diameter portion of the rotation roll.

In the present invention, the water-permeable sheet is not particularly limited, but is formed of felt, non-woven 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. .

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 molding raw material is not particularly limited as long as it is used for producing a known hydraulic inorganic molded body such as a cement slurry.

Further, the obtained molded body is not particularly limited, but after the molding is completed, it may be cured and hardened under predetermined conditions for a certain period of time, and then, if necessary, may be coated.
It is preferable that the developing roll is rotated in the relative movement direction in synchronization with the relative movement speed of the water-permeable sheet with respect to the raw material supply device. In addition, when the molded body has an uneven shape such as a corrugated shape, the developing roll also has a cross-sectional uneven shape such as a roughly gourd-shaped cross section. Preferably, the sheet is rotated so as to be synchronized with the relative moving speed of the water-permeable sheet with respect to the supply device.

The developing roll is permeable to water so that the peripheral speed of the minimum diameter portion is equal to or higher than the relative moving speed of the permeable sheet relative to the raw material supply device and equal to or less than three times the relative moving speed of the permeable sheet. It is preferable to rotate the sheet forward in the relative movement direction of the sheet. That is, when the peripheral speed of the minimum diameter portion is lower than the relative movement speed of the water-permeable sheet with respect to the raw material supply device, a roping-like uneven pattern due to friction between the developing roll and the forming raw material surface is formed on the developed and formed object surface, When the speed exceeds three times the relative movement speed of the water-permeable sheet with respect to the raw material supply device, the raw material is scraped out, and the appearance of the obtained molded article may be poor.

It is preferable that the height of the rotating roll can be changed up and down, that is, the width of the gap can be adjusted according to the thickness of the compact. Further, it is preferable that the shape of the gap is substantially similar to the cross-sectional shape of the molded body.

In the manufacturing method of the first aspect, the stirring means is not particularly limited. For example, a stirring blade is provided in a hopper such that a rotation axis thereof is orthogonal to a moving direction of the water-permeable sheet. Means of stirring with a blade may be used. When the stirring blade is used as described above, it is preferable that the rotation direction of the stirring blade is rotated in the opposite direction of the rotating roll.

In the manufacturing method according to the second aspect, the forming material guide plate is not particularly limited, but is preferably in contact with the rotating roll, and more preferably in contact with the rotating roll below the rotation axis of the rotating roll. The angle of inclination of the forming material guide plate is not particularly limited as long as the forming material can be skillfully guided toward the gap, but is preferably about 30 ° to 60 °.

[0020]

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 in the manufacturing method of the first aspect.

As shown in FIG. 1, this manufacturing apparatus 1a
The water-permeable sheet 2, the raw material supply device 3, the suction means 4, and the preliminary supply hopper 9a are provided so that a corrugated forming plate F as shown in FIG. 2 can be formed. That is, the water-permeable sheet 2 has water permeability, is in the form of an endless belt, and rotates at a constant speed in the arrow X direction of FIG. I have.

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 is, as shown in FIG.
A decompression box 5 and a number of suction boxes 6 are provided.

A large number of suction boxes 6 are connected in the form of an endless belt via an annular chain (not shown), and a sprocket 6 on which the chain is hung.
1 and 61 are rotated at the same speed in the same rotation direction as the water permeable sheet 2 by being driven to rotate, and when they become parallel to the upper parallel portion of the water permeable sheet 2, FIG.
As shown in FIG. 5, the suction surface 62 of each suction box 6 is in close contact with the lower surface of the water-permeable sheet 2 and the water is permeable by rising walls 66a and 66b provided on both sides of the suction surface 62. The misalignment of the conductive sheet 2 in the width direction is prevented.

As shown in FIG. 3, the suction surface 62 is formed in a shape conforming to the wave shape of one surface of the molded body, and has a large number of suction holes 63 formed therein. 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. And, as shown in FIG.
A front lid portion 52 and a rear lid portion 53 for receiving the suction box 6 are provided before and after the pressure reducing hole 51 so as to close the ventilation hole 64 of the suction box 6.

That is, the suction means 4 causes the suction box 6 to move onto the decompression box 5 by the rotation of the sprocket 61, and firstly, the ventilation holes 64 are temporarily closed by the front lid 52 so as to be airtight.
Can be received. Then, when the suction box 6 further moves and the ventilation hole 64 communicates with the decompression hole 51, the inside of the suction box 6 is decompressed by decompression from the decompression box 5, and the water is permeable from the suction hole 63 provided on the suction surface 62. Excess water in the forming raw material can be dehydrated under reduced pressure through the sheet 2. In addition, the suction box 6 can be received by the rear lid 53 until the suction box 6 completely passes the rear end (end in the traveling direction) of the pressure reducing hole 51.

The 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 conform to the wave shape of the other surface of the molded body F to be molded, and the rotation speed is freely changeable. The molding raw material is developed while rotating with the reciprocation of the device 3.

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 arranged on the left and right so as to face both ends of the developing rolls 33, 33, and the lower ends thereof are received by the rising walls 66 a, 66 b of the suction box 6.

The preliminary supply hopper 9a is shown in FIGS.
As shown in the figure, the wall 91 on the moving direction side of the water-permeable sheet 2 (hereinafter, referred to as a “rear wall”) 91 is a starting end of the decompression dehydration region V, that is, a starting end of the decompression hole 51. As shown in FIGS. 4 and 5, the side walls 93, 93 are provided so as to substantially slidably contact the upper surfaces of the rising walls 66a, 66b of the suction box 6 which has moved. Wall facing 91 (hereinafter “front wall”)
) 92 are provided so as to substantially slide on the water-permeable sheet 2.

The rear wall 91 is formed of a wall main body 91a and a rotating roll 91b, and a gap 91c serving as a preliminary supply port is provided between the rotating roll 91b and the water-permeable sheet 2. As shown in FIG. 4, the rotating roll 91b is formed in a shape along the other surface of the molded body F to be obtained, and can be moved up and down to adjust the interval of the gap 91c and at an arbitrary rotating speed. It is designed to rotate.

The wall main body 91a forms the upper end of the front wall 91 and is integrated with the side walls 93,93. The preliminary supply hopper 9a transfers the molding material 8 from the raw material tank (not shown) into the preliminary supply hopper 9a as shown in FIG.
Are sequentially filled, and as shown in FIGS. 1 and 6, a stirring blade 94 as stirring means is provided inside.

The stirring blade 94 has a rotation axis orthogonal to the moving direction of the water permeable sheet 2 and rotates in the direction opposite to the moving direction of the water permeable sheet 2 so as to be filled in the preliminary supply hopper 9a. The formed raw materials 8 are sequentially stirred.

In the method of manufacturing the molded body F using the manufacturing apparatus 1a, first, the water permeable sheet 2 and the suction box 6 are rotated at the same speed in the same direction, and the inside of the pressure reducing box 5 is reduced by the pressure reducing means. Keep it. The width of the gap 91c is adjusted to be substantially the same as the thickness of the compact F, and the minimum diameter portion of the rotating roll 91b (the portion corresponding to the peak of the compact F)
While the peripheral speed is rotated so as to be substantially the same as the moving speed of the water-permeable sheet 2, the molding raw material 8 filled in the preliminary supply hopper 9a is preliminary supplied to the thickness of the gap 91c. That is, since the forming raw material 8 is received by the permeable sheet 2, the rear wall 91 is moved with the movement of the permeable sheet 2.
And is preliminarily supplied in the shape of the gap 91c.

At the same time, the stirring blades 94 are rotated in the direction opposite to the moving direction of the water-permeable sheet 2 to stir the molding material 8 filled in the preliminary supply hopper 9a. The preliminarily supplied molding raw material 8 enters the reduced-pressure dewatering region V as the water-permeable sheet 2 advances,
Excess water in the forming raw material 8 starts to be dehydrated from the water absorbing holes 63 through the water permeable sheet 2.

Next, the forming raw material 8 is further supplied onto the water-permeable sheet 2 by the raw material supply device 3 which reciprocates within the moving range W, and is developed and shaped by the developing rolls 33, 33 and at the same time. Excess water is dehydrated through the water-absorbing holes 63 through the water-permeable sheet 2, and the expanded shaped article 81 having a corrugated cross section is formed.
Is manufactured continuously. After that, the shaped object 81 is cut into a predetermined length and cured and cured to produce a molded plate F as shown in FIG.

As described above, according to the method for producing a hydraulic inorganic molded article, the preliminary supply hopper 9a is provided, and the molding material 8 is formed into a sectional shape of the gap 91c immediately before the reduced-pressure dewatering region V, so that the water-permeable sheet 2 is formed. Because I made a preliminary supply above,
The molding raw material 8 is always supplied onto the water-permeable sheet 2 in the reduced-pressure dewatering area V, and the inside of the reduced-pressure box 5 is always maintained in a stable reduced-pressure state.

Further, the stirring blades 94 are provided in the preliminary supply hopper 9c, and the molding material 8 filled in the preliminary supply hopper 9c is stirred by the stirring blades 94. As a result, the forming raw material 8 that has been carried to the rear wall 91 side and has not been subjected to the preliminary supply is returned to the front wall 92 side again. Therefore, the forming material 8 does not stay on the rear wall 91 side, and the forming material 8 can be stably supplied in a preliminary manner.

FIG. 7 shows an example of a manufacturing apparatus used in the manufacturing method of the second aspect. As shown in FIG. 7, this manufacturing apparatus 1b is the same as the above-mentioned manufacturing apparatus 1a, except that a preliminary supply hopper 9b is provided with a forming material guide plate 95 instead of the stirring blade 94 inside.

That is, the forming raw material guide plate 95 is inclined so as to approach the water permeable sheet 2 in the direction of the rotating roll 91b, and the tip is formed on the peripheral surface of the rotating roll 91b at the lower part of the rotating shaft of the rotating roll 91b. In contact. In the manufacturing method using the manufacturing apparatus 1b, the forming raw material 8 is separated from the gap 91 by using the forming raw material guide plate 95 without using the stirring blade 94.
It is the same as the above-mentioned manufacturing method except that c was induced.

That is, according to this manufacturing method, the forming raw material 8 in the preliminary supply hopper 2 tends to be carried on the water permeable sheet 2 by the movement of the water permeable sheet 2 and conveyed to the rear wall 91 side. Since the forming material guide plate 95 is provided, the amount of forming material 8 required for preliminary supply is guided to the gap 91c by the inclination of the forming material guide plate 95. Therefore, the forming material 8 does not stay on the rear wall 91 side, and the forming material 8 can be stably supplied in a preliminary manner.

FIGS. 8 and 9 show an example of a manufacturing apparatus used in the manufacturing method of the third aspect. As shown in FIG. 8, this manufacturing apparatus 1c does not include the stirring blade 94 or the forming material guide plate 95 in the preliminary supply hopper 9c, and as shown in FIGS.
Shaft 91d and the lower end 9 of the minimum diameter portion of the rotating roll 91b
Except that the supply is controlled so as to keep it between 1d and 1d, it is the same as the above-mentioned manufacturing apparatuses 1a and 1b.

That is, according to the manufacturing method using the manufacturing apparatus 1c, the supply of the forming raw material 8 is controlled so as to be maintained between the rotating shaft 91d of the rotating roll 91b and the lower end 91d of the minimum diameter portion of the rotating roll 91b. As a result, a large amount of the forming material 8 does not stay on the rear wall 91 side, and the forming material 8 can be stably preliminarily supplied.

The method for producing the hydraulic inorganic molded article according to the present invention is not limited to the above embodiment. For example,
In the above-described embodiment, the corrugated shaped body is manufactured, but another shape such as a flat shape may be used. Also,
In the above embodiment, the rising walls 66a, 66b are provided on both sides of the suction surface 62 of the suction box 6, but the rising walls are not provided, and the lower end of the side wall 36 of the raw material supply means 3 and the preliminary supply are provided. Side walls 93 of hoppers 9a to 9c
The lower end of the molding material 8 may be brought into sliding contact with the water-permeable sheet 2 and the side wall 36 or the side wall 93 may prevent the molding raw material 8 from protruding in the width direction.

Further, in the above-described embodiment, the developing and shaping are performed only by the developing rolls 33 and 33. However, a pressing roll is provided at the rear end of the decompression box 5 or behind the depressurizing box 5, and the shaping is performed by the pressing roll. The object may be further pressed and shaped. Further, the above-described manufacturing apparatus 1a
In the above, only one stirring blade 94 is provided, but two or more stirring blades may be provided.

[0046]

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

(Example 1) Using the production apparatus 1a shown in FIG.
The shaped object 81 having a wave depth of 50 mm was continuously formed under the conditions described above, and the change in the degree of vacuum in the decompression box 5 was examined. As a result, the degree of vacuum was substantially constant without variation.

(Embodiment 2) Using the manufacturing apparatus 1b shown in FIG.
The shaped object 81 having a wave depth of 50 mm was continuously formed under the conditions described above, and the change in the degree of vacuum in the decompression box 5 was examined. As a result, the degree of vacuum was substantially constant without variation.

(Embodiment 3) Using the manufacturing apparatus 1c shown in FIG. 8, the level of the forming raw material 8 is maintained between the rotating shaft 91d of the rotating roll 91b and the lower end 91d of the minimum diameter portion of the rotating roll 91b. While controlling the supply amount of the forming raw material 8 as described above, the degree of vacuum at the time of molding in the decompression box 5 is set to 400 mmHg, and the shaped object 81 having a wave depth of 50 mm is continuously molded. When the change in the degree of vacuum in 5 was examined, the degree of vacuum was substantially constant without variation.

(Comparative Example 1) Using the manufacturing apparatus 1c shown in FIG.
When the vacuum degree at the time of molding was set to be 400 mmHg and an attempt was made to continuously mold the shaped object 81 having a wave depth of 50 mm, the forming raw material 8 stayed near the rotating roll 91b,
A stable preliminary supply of the forming material 8 onto the water-permeable sheet 2 could not be performed.

[0051]

The method for producing a hydraulic inorganic molded article according to the present invention is configured as described above, so that the molding raw material can be stably and preliminarily supplied. That is, even with a molded article having a corrugated shape such as a corrugated sheet, a molded article with stable quality can be continuously produced.

[Brief description of the drawings]

FIG. 1 is a side view illustrating an example of a manufacturing apparatus used in the manufacturing method according to the first embodiment.

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 a sectional view taken along line BB of FIG. 1;

FIG. 5 is a sectional view taken along line CC of FIG. 1;

FIG. 6 is a longitudinal sectional view of a preliminary supply hopper portion of FIG. 1;

FIG. 7 is an example of a manufacturing apparatus used in the manufacturing method according to claim 2 and is a cross-sectional view of a preliminary supply hopper.

FIG. 8 is an example of a manufacturing apparatus used in the manufacturing method according to claim 3 and is a cross-sectional view of a preliminary supply hopper.

FIG. 9 is a sectional view taken along line DD of FIG. 8;

[Explanation of symbols]

 Reference Signs List 2 permeable sheet 3 raw material supply device 33 developing roll 4 suction means 5 decompression box 6 suction box 62 suction surface 63 suction hole 8 forming raw material 81 developed and shaped objects 9a, 9b, 9c preliminary supply hopper 91 moving direction of permeable sheet 2 Side wall (rear wall) 91a Wall main body 91b Rotary roll 91c Clearance 91d Rotation center axis 91e Lower end of minimum diameter portion 94 Stirring blade (stirring means) 95 Forming material guide plate V Decompression dehydration area F Molded body

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4G052 DB03 DC04 4G054 AA01 AB06 AC00 BC12 BC22 4G055 AA01 AB01 AC01 CA02 CA08 CA23

Claims (3)

[Claims] 1. A water-permeable sheet having a shape along one surface of a molded article to be molded, and having a shape along a suction surface of a suction means provided with a large number of suction holes, the water-permeable sheet being arranged from one side to the other. And the preliminary supply hopper of the substantially cylindrical forming raw material is moved to the side, and the lower end faces of the three walls except for the wall on the moving direction side of the water permeable sheet have the lower end surfaces of the water permeable sheet and / or suction means. The hopper is disposed so as to be substantially in contact with the edge, and a gap serving as a preliminary supply port is provided at the lower end of the wall on the moving direction side of the water-permeable sheet, and the gap faces the start end of the decompression dewatering area. The raw material supply device in which the forming raw material filled in the inside is continuously preliminarily supplied onto the water-permeable sheet in the form of a gap from the gap, and then two developing rolls are provided in parallel in the moving direction of the water-permeable sheet. With the permeable sieve. While reciprocating in the direction of movement of the door,
The forming raw material is further supplied onto the preliminarily supplied forming raw material from between the developing roll and the developing roll, and the supplied forming raw material is formed into a gap between the developing roll and the water-permeable sheet by both developing rolls. And a method for producing a hydraulic inorganic molded body, wherein excess water in the molding material is depressurized and dehydrated through a suction hole through a water-permeable sheet by suction means, wherein the gap of a preliminary supply hopper is Immediately above the gap of the formed wall is formed by a rotating roll having a shape substantially along the other surface of the molded body to be obtained, and the molding material filled in the preliminary supply hopper at the time of preliminary supply is stirred by stirring means. A method for producing a hydraulic inorganic molded article, which comprises stirring. 2. A water-permeable sheet having a shape along one surface of a molded body to be molded, and having a shape along a suction surface of a suction means provided with a large number of suction holes, the water-permeable sheet being arranged from one side to another. And the preliminary supply hopper of the substantially cylindrical forming raw material is moved to the side, and the lower end faces of the three walls except for the wall on the moving direction side of the water permeable sheet have the lower end surfaces of the water permeable sheet and / or suction means. The hopper is disposed so as to be substantially in contact with the edge, and a gap serving as a preliminary supply port is provided at the lower end of the wall on the moving direction side of the water-permeable sheet, and the gap faces the start end of the decompression dewatering area. The raw material supply device in which the forming raw material filled in the inside is continuously preliminarily supplied onto the water-permeable sheet in the form of a gap from the gap, and then two developing rolls are provided in parallel in the moving direction of the water-permeable sheet. With the permeable sieve. While reciprocating in the direction of movement of the door,
The forming raw material is further supplied onto the preliminarily supplied forming raw material from between the developing roll and the developing roll, and the supplied forming raw material is formed into a gap between the developing roll and the water-permeable sheet by both developing rolls. And a method for producing a hydraulic inorganic molded body, wherein excess water in the molding material is depressurized and dehydrated through a suction hole through a water-permeable sheet by suction means, wherein the gap of a preliminary supply hopper is The upper portion of the formed wall is formed by a rotating roll having a shape substantially along the other surface of the molded body to be obtained, and the tip is rotated toward the rotating roll in such a manner as to approach the water-permeable sheet. A method for producing a hydraulic inorganic molded product, comprising: providing a forming material guide plate of a forming material filled in a preliminary supply hopper reaching a vicinity of a roll in the hopper. 3. A water-permeable sheet having a shape along one surface of a molded article to be molded, and having a shape along a suction surface of a suction means having a plurality of suction holes formed therein, the water-permeable sheet being arranged from one side to another. And the preliminary supply hopper of the substantially cylindrical forming raw material is moved to the side, and the lower end faces of the three walls except for the wall on the moving direction side of the water permeable sheet have the lower end surfaces of the water permeable sheet and / or suction means. The hopper is disposed so as to be substantially in contact with the edge, and a gap serving as a preliminary supply port is provided at the lower end of the wall on the moving direction side of the water-permeable sheet, and the gap faces the start end of the decompression dewatering area. The raw material supply device in which the forming raw material filled in the inside is continuously preliminarily supplied onto the water-permeable sheet in the form of a gap from the gap, and then two developing rolls are provided in parallel in the moving direction of the water-permeable sheet. With the permeable sieve. While reciprocating in the direction of movement of the door,
The forming raw material is further supplied onto the preliminarily supplied forming raw material from between the developing roll and the developing roll, and the supplied forming raw material is formed into a gap between the developing roll and the water-permeable sheet by both developing rolls. And a method for producing a hydraulic inorganic molded body, wherein excess water in the molding material is depressurized and dehydrated through a suction hole through a water-permeable sheet by suction means, wherein the gap of a preliminary supply hopper is Just above the gap of the formed wall is formed by a rotating roll having a shape substantially along the other surface of the molded body to be obtained, and the level of the forming raw material in the preliminary supply hopper is determined by a rotation center axis of the rotating roll. A method for producing a hydraulic inorganic molded article, wherein the pressure is maintained between the lower end of the minimum diameter portion of the rotating roll.