JP2000334716A - Dehydration molding press and dehydration molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent water from dripping from a molding when the molding is released from a mold and at the same time, rapidly release the molding from the mold to obtain the high-quality molding. SOLUTION: The dehydration molding press presses the upper face of a molding with the help of a dehydrating plate 6 having numerous dehydrating holes and vacuum-suck water from the dehydrating holes 8 of the dehydrating plate 6 to perform the dehydration process. In addition, the press has a thin movable porous plate 9 which is thinner than the dehydrating plate 6 and laminated on the lower face of the dehydrating plate 6 in such a manner that the plate 9 is separated from the plate 6, and dehydrates/molds the molding through the movable porous plate 9. Further, the press separates the movable porous plate 9 from the dehydrating plate 6 and vacuum-sucks and removes the residual water from the dehydrating holes 8 of the plate 6, when the molding is released from the plate 6 after dehydration and molding procedures.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press device for dewatering and forming a slurry material and a dewatering method using the press device.

[0002]

2. Description of the Related Art A conventional dewatering press is shown in FIG. In the dewatering molding press shown in this figure, a raw material charging form 2 is provided on the upper surface of a press bed 1. A slurry-like raw material is supplied to the raw material charging mold 2. The raw material in the form of a slurry is, for example, calcium silicate, cement mortar, pulp, sludge or the like containing a considerable amount of water. In order to dewater the slurry-like raw material, a dewatering box 3
Is press-fitted. The dewatering box 3 is fixed to a slide frame 5 pushed down by a hydraulic cylinder 4.

[0003] As shown in FIG. 2, a dewatering box 3 is provided for sucking water squeezed out during dehydration molding.
The upper surface of the dehydrator 6 is a vacuum box 7, which communicates with the vacuum box 7 and penetrates the dehydrator 6 to open a number of dehydration holes 8. When the dewatering box 3 is pushed down to dewater and form the slurry-like raw material, moisture of the raw material passes through the dewatering hole 8 and is sucked from the vacuum box 7.

[0004]

In the dewatering molding press having the structure shown in FIG. 1, the surface pressure to be applied is not constant depending on the application, but most of the presses have a surface pressure of 30 to 100 k.
The pressure is set to be as high as gf / cm ² . This is because the water contained in the slurry is efficiently dewatered and molded. In a dehydration molding press that presses at a high pressure, strength is required for a dehydrator. For this reason, a thick metal plate, for example, a metal plate of 30 to 80 mm is used for the dehydrator.

[0005] This dewatering molding press dewaters and forms a slurry-like raw material in the following steps. The slurry-like raw material is supplied to the raw material charging mold 2, the dewatering box 3 is lowered, and the raw material is dewatered and formed while sucking the vacuum box 7. In order to remove the dewatered molded product, the vacuum in the vacuum box 7 is stopped or pressurized air is supplied to the vacuum box 7. This is because if the vacuum box 7 is kept in a vacuum state, the molded product will be attracted to the lower surface of the dehydrator 6 and cannot be separated. The molded product is separated from the dewatering machine 6 and discharged from the dewatering press.

When the dewatered molded article is removed from the mold in the above steps, water remaining in the dewatering holes of the dehydrator has a disadvantage that it falls onto the molded article. This is due to the fact that the dehydration molding press squeezes out the water contained in the raw material slurry by squeezing it with a dehydrator, instead of sucking it in a vacuum and dehydrating it. In this state, a dewatering press in which a slurry-like raw material is pressed to perform dehydration molding is pressed at a high pressure, so that the molded article is in close contact with the lower surface of the dehydrator. For this reason, the lower end of the dewatering hole of the dehydrator is closed by the molded product in a state where the dehydration molding of the molded product is completed. Therefore, even if the vacuum box is sucked, air cannot pass through the dewatering hole, and water remains in the dewatering hole. In this state, the water in the dewatering hole cannot be drained. Therefore, when the molded article is separated from the dehydrator and removed from the mold, the water in the dehydration holes falls on the molded article.

Further, the inability to maintain the vacuum inside the vacuum box when removing the molded product is one of the reasons why water in the dehydration holes cannot be prevented from falling onto the molded product. This is because if the vacuum box is evacuated and the molded article can be removed from the mold, the dehydration holes are sucked into the vacuum box when the mold is removed. When the vacuum box is held in a vacuum state, the molded product is adsorbed to the lower surface of the dehydrator by vacuum and is not removed from the mold. Therefore, when removing the molded product, the vacuum in the vacuum box is released or the inside of the vacuum box is pressurized. In this state, when the molded product is released from the mold, the water in the dehydration holes is not sucked into the vacuum box and falls on the product.

[0008] Therefore, the conventional dewatering press cannot effectively prevent water from dropping on the molded product when it is released from the mold. This adverse effect can be solved by providing a dewatering plate for pressurizing the upper surface of the molded product without providing a dehydration hole and draining only the lower surface of the molded product and pressing. However, the dewatering molding press that drains water only to the lower surface of the molded product is not only unable to efficiently dewater the slurry-like raw material because it drains only to one side,
It becomes extremely difficult to separate the molded article from the dewatering machine. This is because the dewatered molded product comes into close contact with the lower surface of the dehydrator. In particular, a dehydrator without a dehydration hole transfers moisture only downward and dehydrates it.Therefore, there is less water on the upper surface of the molded product, and the molded product adheres strongly to the lower surface of the dehydrator, and the mold is removed. It becomes extremely difficult.

A device for dehydrating and molding the upper surface of a molded product with a dehydrator having a dehydration hole can quickly remove the molded product, but cannot eliminate the disadvantage that water in the dehydration hole falls onto the molded product. The water that falls on the molded product swells the local part of the molded product, and makes it impossible to form a beautiful smooth surface as a convex portion. In addition, the surface of the molded product is stained to significantly lower the quality. To further complicate matters, stains formed by falling water cannot be removed even if the surface is polished after drying, because the stain has penetrated deep into the molded article. Furthermore, even if the water adhering to the surface of the molded article is blown off with air or the like immediately after demolding, local swelling and spots cannot be efficiently eliminated. This is because the water that has fallen on the molded article is almost instantaneously absorbed into the interior of the molded article by capillary action.

The present invention has been developed for the purpose of solving the above-mentioned various adverse effects. An important object of the present invention is to prevent water from dropping onto a molded product during demolding. It is an object of the present invention to provide a dehydration molding press and a dehydration molding method that can effectively prevent the formation of a molded product, and can quickly produce a molded product of high quality.

[0011]

The dewatering molding press of the present invention has the following arrangement to achieve the above object.
The dehydration press presses the upper surface of the molded product S with a large number of dehydration holes 8.
Is pressed by a dehydrator 6 having the above, and the dehydration holes 8 of the dehydrator 6 are sucked in vacuum to dehydrate. Further, in the dewatering press, the movable perforated plate 9 thinner than the dewatering plate 6 is laminated on the lower surface of the dewatering plate 6 so that the movable perforated plate 9 can be separated from the dewatering plate 6. are doing. The dewatering press press separates the movable porous plate 9 from the dehydrator 6 when removing the dewatered molded product S from the dehydrator 6, and sucks the water remaining in the dehydration holes 8 of the dehydrator 6 by vacuum. And remove it.

Further, in the dewatering press according to the second aspect of the present invention, the movable porous plate 9 is a metal plate having a large number of through holes 10 opened.

Further, in the dewatering press according to the third aspect of the present invention, the movable porous plate 9 is connected to the dehydrator 6 through the cylinder 11.

Further, in the dehydration molding method according to a fourth aspect of the present invention, the upper surface of the molded product S is pressed by a dehydrator 6 having a large number of dehydrator holes 8, and the dehydrator holes 8 of the dehydrator 6 are evacuated by vacuum. To dehydrate. Furthermore, the dehydration molding method includes:
The movable perforated plate 9 thinner than the dehydrator 6 is laminated so as to be separable from the dehydrator 6, and the molded article S is dehydrated through the movable perforated plate 9. The dewatered molded product S is dewatered by a dehydrator 6
When the mold is released from the mold, the movable perforated plate 9 is separated from the dehydrator 6, and water remaining in the dehydrating holes 8 of the dehydrator 6 is suctioned and removed in a vacuum.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. However, the following examples illustrate the dehydration molding press and the dehydration molding method for embodying the technical idea of the present invention, and the present invention does not specify the dehydration molding press and the method as follows. .

Further, in this specification, in order to make it easier to understand the claims, the numbers corresponding to the members shown in the embodiments will be referred to as “claims” and “ In the column of “means”. However, the members described in the claims are not limited to the members of the embodiments.

The dewatering press shown in FIG. 3 includes a slide frame 5 forcibly lowered by a hydraulic cylinder 4, a dewatering box 3 installed on the slide frame 5,
A dewatering box 3 is provided with a raw material charging form 2 for supplying a raw material in the form of slurry to be dewatered and formed, and a press bed 1 on which the raw material charging form 2 is disposed on the upper surface.

The slide frame 5 is pressed down by the hydraulic cylinder 4 while maintaining a horizontal posture, and dehydrates the slurry raw material. The hydraulic cylinder 4 is, for example,
The slide frame 5 is pressed down at a pressure that can press the molded product to be dewatered at a surface pressure of 30 to 100 kgf / cm ² . A dehydration molding press in which the pressurized surface pressure of the molded product is 50 kgf / cm ² and the size of the molded product is 1 × 3 m, the hydraulic cylinder 4 has a slide frame 5 with a force of 1500 tons.
Press down.

As shown in FIG. 4, the dewatering box 3 is provided with a vacuum box 7 hermetically closed by connecting a dewatering disc 6 on the lower surface and a top plate 12 on the upper surface with a rib 13. The ribs 13 reinforce the dewatering box 3 and provide an airtight vacuum box 7 inside. The dehydrator 6 has a number of dehydration holes 8 opened. The dewatering hole 8 allows water to pass when the slurry-like raw material is pressed. The dewatering holes 8 are opened to an optimum size and number in consideration of the type of the slurry-like raw material. The dewatering hole 8 has, for example, an inner shape of 2 to 15 m.
m, preferably 3 to 10 mm, more preferably 5 to 1
0 mm, and the distance between adjacent dehydration holes 8 is about 5 mm to 2 mm.
The opening is 0 mm, preferably 5 mm to 10 mm.

A vacuum dewatering pipe 14 is connected to the vacuum box 7. As shown in FIG. 3, the vacuum dewatering pipe 14 is connected to a vacuum tank 16 outside the dewatering box 3 via an on-off valve 15. The vacuum tank 16 is connected to a vacuum pump 17. The vacuum dewatering pipe 14 is branched into a plurality of parts inside the vacuum box 7, and extends the lower end of the branch path 14 </ b> A to the bottom of the vacuum box 7.
Drain the water.

Furthermore, the dewatering box 3 has a movable perforated plate 9 thinner than the dehydrator 6 laminated on the lower surface so as to be separable from the dehydrator 6. The movable porous plate 9 has a large number of through holes 1.
0 is a metal plate opening. As the movable porous plate 9, for example, an iron plate or a stainless plate of 1 to 5 mm, preferably 1 to 4 mm, and more preferably 2 to 3 mm is used.
The movable perforated plate 9 is disposed below the dehydrator 6 via a cylinder 11 connected to a top plate 12. The cylinder 11 moves the movable perforated plate 9 up and down in a horizontal posture to separate it from the dehydrator 6 or to make it close to the lower surface of the dehydrator 6.

The movable perforated plate 9 is connected so that it can be separated from the lower surface of the dehydrator 6, but need not necessarily be connected to the dehydrator box 3 via the cylinder 11. For example, via a spring 18 as shown in FIG. 5, or via a cam 19 as shown in FIG.
As shown in FIG. 7, it is also possible to connect via a crank 20 so as to be separated from the dehydrator 6.

The movable porous plate 9 connected to the dehydrator 6 via a spring 18 is in close contact with the lower surface of the dehydrator 6 when the dehydrator 6 presses a slurry-like raw material. When the dehydrator 6 is raised, the movable perforated plate 9 is separated from the lower surface of the dehydrator 6 by being pushed by the spring 18. The movable porous plate 9 connected via the cam 19 and the crank 20
By rotating the crank 20 or the like, it is separated from the lower surface of the dehydrator 6.

The movable porous plate 9 is in close contact with the lower surface of the dehydrator 6 in the state shown in FIG. The movable perforated plate 9 shown in this figure has a through hole 10 at the same position as the dewatering hole 8 provided in the dewatering board 6. Further, the through-hole 10 shown in the figure has a tapered shape in which the opening area gradually increases upward. In the through-hole 10 having this shape, the airflow flowing between the movable perforated plate 9 and the dehydrator 6 smoothly discharges water remaining in the through-hole 10. This is because, as shown in FIG. 9, the air flow flows so as to blow off the water in the tapered through-hole 10 and is sucked into the dewatering hole 8 of the dewatering board 6.

The movable porous plate 9 shown in FIG. 8 can be dewatered and formed by pressing a slurry-like raw material in a state in which it is in surface contact with the lower surface of the dehydrator 6. In the dewatering press of the present invention, as shown in FIG. 10, a wire net 21 can be sandwiched between the dewatering board 6 and the movable porous plate 9. The dehydration molding press of this structure
It is not necessary to provide the through hole 10 of the movable perforated plate 9 at the same position as the dewatering hole 8 of the dewatering board 6. This is because air flows in the horizontal direction between the dewatering plate 6 and the movable perforated plate 9 in a state where the slurry-like raw material is pressed.

The movable porous plate 9 is formed by laminating a wire mesh 22 on the surface, and dewatering and forming a slurry material. The wire mesh 22 is a mesh that allows water to pass without passing the slurry-like raw material. The movable perforated plate 9 having the wire mesh 22 laminated on the surface thereof can prevent the slurry-like raw material from flowing into the through-hole 10 and can dewater-form the raw material. When the slurry-like raw material does not pass through the through-hole 10 of the movable porous plate 9 during dehydration molding, that is, when the through-hole 10 is small enough not to allow the raw material to pass through, the metal mesh 22 is not laminated and the movable porous plate In step 9, the raw material can be directly dewatered and formed.

In the press bed 1, a wire net is laid on the upper surface to drain the water contained in the supplied slurry-like raw material. Further, a press bed having the same structure as the dehydrator for pressing and dewatering the top surface of the slurry-like raw material and laying a wire net thereon may be used. The press bed of this structure can also efficiently dewater from the lower surface.

The dehydration molding press having the above structure dehydrates a slurry-like raw material in the following steps. The slide frame 5 is raised by the hydraulic cylinder 4, and the dehydration box 3 is set to the raised position, and
Is supplied to the slurry. The slide frame 5 is lowered by the hydraulic cylinder 4, and the raw material in a slurry state is pressed in the dewatering box 3.
At this time, the movable perforated plate 9 is brought into close contact with the lower surface of the dehydrator 6. The water contained in the raw material passes through the through hole 10 of the movable porous plate 9, passes through the dehydration hole 8 of the dehydrator 6, and flows into the vacuum box 7. The apparatus for laminating the wire mesh 22 on the surface of the movable porous plate 9 passes water of the slurry material through the wire mesh 22, the through-hole 10 of the movable porous plate 9, and the dewatering hole 8 of the dehydrator 6, and forms a vacuum box. Flow into 7

The water in the vacuum box 7 is supplied to the vacuum dewatering pipe 14
Is discharged outside. The vacuum dewatering pipe 14 opens the on-off valve 15 to drain the water in the vacuum box 7.
The water in the vacuum box 7 passes through the on-off valve 15 and is sucked into the vacuum tank 16 and discharged. In this state, the slurry-like raw material is dehydrated and formed into a plate shape. However, the dehydration molding press of the present invention has a shape for molding a slurry-like raw material,
Not specified as a plate. The raw material is dewatered and formed in the press bed 1 and the dewatering box 3, and a specified shape, for example, a heat insulating material used for heat insulation of the pipe is formed into a shape curved in an arch shape.

After the raw material is subjected to dehydration molding, the on-off valve 15 is kept in an open state, and the dewatering box 3 is raised without raising the movable porous plate 9. In this state, the movable perforated plate 9
There is a gap between the and the dehydrator 6 as shown in FIG.
With the movable perforated plate 9 separated from the dehydrator 6, air flows into the gap between the movable perforated plate 9 and the dehydrator 6. The air sucked into the gap passes through the dewatering hole 8 of the dewatering board 6 and is sucked into the vacuum box 7. The air passing through the dewatering hole 8 sucks up water remaining in the dewatering hole 8 into the vacuum box 7 at the time of dehydration molding. Further, as shown by arrows in FIG. 9, the flowing air flow also blows off water remaining in the through holes 10 of the movable perforated plate 9 and sucks the water from the dewatering holes 8 into the vacuum box 7.

The water in the through holes 10 is completely removed from the vacuum box 7.
When the movable perforated plate 9 is separated from the dehydrated molded product S, the through-hole 10 of the movable perforated plate 9
The remaining water does not drop, and a very high quality molded product S can be manufactured. However, since the movable porous plate 9 is very thin, even if some water remains in the through-hole 10, this water does not lower the quality of the molded product S. In particular, the movable perforated plate 9
The device using extremely thin plate material of less than 1 mm
The amount of water falling on the molded article S can be extremely reduced without draining water of zero.

After closing the on-off valve 15, the movable porous plate 9 is raised by the cylinder 11. The ascending movable perforated plate 9 is separated from the surface of the molded product S. This is because the upper surface of the through hole 10 is open, so that the lower surface of the movable porous plate 9 does not adsorb the molded product S. When the molded product S cannot be peeled from the movable porous plate 9 in this state, pressurized air is injected into a gap between the movable porous plate 9 and the dehydrator 6. The pressurized air to be pressed flows downward from the through hole 10 of the movable perforated plate 9 to forcibly separate the molded product S that is in close contact with the lower surface. Further, in a state where the movable perforated plate 9 is in close contact with the dehydrator 6, pressurized air can be pressed into the vacuum box 7 to separate the molded product S from the movable perforated plate 9. When pressurized air is pressed into the vacuum box 7, the on-off valve 15 connected to the vacuum tank 16 is closed.

Molded product S separated from movable perforated plate 9
Is taken out of the raw material charging mold 2.

The dewatering molding press can also dewater-deform the slurry-like raw material as follows. Are the same as those described above. After the raw material is dewatered and formed, the on-off valve 15 is held in the open state, and the movable perforated plate 9 is not separated from the dehydrator 6,
As shown in FIG. 11, it is raised together with the dehydration box 3. In this state, the molded product S is adsorbed on the lower surface of the movable porous plate 9 and is raised.

Thereafter, the movable perforated plate 9 is moved to the cylinder 1
1 to separate from the lower surface of the dehydrator 6. In this state, a gap is formed between the movable perforated plate 9 and the dehydrator 6, and air flows into the gap. The air sucked into the gap passes through the dewatering hole 8 of the dewatering board 6 and is sucked into the vacuum box 7. The air passing through the dewatering hole 8 sucks up water remaining in the dewatering hole 8 into the vacuum box 7 at the time of dehydration molding.

Further, the movable perforated plate 9 separated from the dehydrator 6
Opens the upper part of the through-hole 10 so that the molded product S is not adsorbed on the lower surface and the molded product S is peeled off. When the molded article S cannot be peeled in this state, as in the method described above,
Pressurized air is injected into the gap between the movable porous plate 9 and the dehydrator 6. The pressurized air to be pressed is applied to the through holes 10 of the movable porous plate 9.
, And forcibly separates the molded product S that adheres to the lower surface. Further, the molded product S can be separated from the movable perforated plate 9 by pressurizing the movable box 9 again to raise the movable perforated plate 9 and bringing the movable perforated plate 9 into close contact with the dehydrating board 6 and pressurized air into the vacuum box 7.

After that, the molded product S is taken out from the raw material charging mold 2.

By using a very thin metal plate as the movable perforated plate 9 and deforming it when the molded product S is peeled off as shown in FIG. 9 can be peeled off.

[0039]

The dehydration molding press and the dehydration molding method of the present invention have the advantage that water can be effectively prevented from dropping on the molded product during demolding and a high quality molded product can be produced. . That is, the dehydration molding press and the dehydration molding method of the present invention stack a movable perforated plate thinner than the dehydrator on the lower surface of the dehydrator so that the movable perforated plate can be separated from the dehydrator, and form the upper surface of the molded product through the movable perforated plate When removing the dewatered molded product from the dehydrator, the movable perforated plate is separated from the dehydrator, and the water remaining in the dehydration holes of the dehydrator is suctioned and removed by vacuum. Because it is. In this dewatering molding press and dewatering molding method, when the molded article is released from the mold, the movable perforated plate is separated from the dehydrator and sucked, so that the dewatering is performed together with the air sucked from between the movable perforated plate and the dehydrator. Water remaining in the dewatering holes of the board can be sucked and removed reliably. For this reason, water does not remain in the dewatering hole, and it is possible to effectively prevent water from dropping onto the molded product from the dewatering hole after demolding as in the related art, and to manufacture a high-quality molded product. Features can be realized.

Further, in the dewatering molding press and the dewatering molding method of the present invention, the movable perforated plate is separated from the dehydrator to remove the molded product. The molded product is not adsorbed. For this reason, there is also a feature that the molded product can be easily and quickly removed from the mold.

[Brief description of the drawings]

FIG. 1 is a front view of a conventional dehydration press.

FIG. 2 is a sectional view of a dewatering box of the dewatering press shown in FIG.

FIG. 3 is a front view of a dewatering press according to an embodiment of the present invention.

FIG. 4 is a sectional view of a dewatering box of the dewatering press shown in FIG. 3;

FIG. 5 is a sectional view showing another example of the connection structure between the movable perforated plate and the dehydrator.

FIG. 6 is a front view showing another example of the connection structure between the movable perforated plate and the dehydrator.

FIG. 7 is a front view showing another example of the connection structure between the movable perforated plate and the dehydrator.

FIG. 8 is a cross-sectional view showing a state in which the dehydration molding press according to the embodiment of the present invention performs dehydration molding.

9 is a sectional view showing a state in which a dewatering machine and a movable perforated plate of the dewatering molding press shown in FIG. 8 are divided.

FIG. 10 is a cross-sectional view showing a state in which a dehydration molding press according to another embodiment of the present invention performs dehydration molding.

FIG. 11 is a cross-sectional view showing another manufacturing process using the dewatering press according to the embodiment of the present invention.

FIG. 12 is a sectional view showing a manufacturing process by a dehydration molding press according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Press bed 2 ... Material input formwork 3 ... Dehydration box 4 ... Hydraulic cylinder 5 ... Slide frame 6 ... Dehydration board 7 ... Vacuum box 8 ... Dehydration hole 9 ... Movable porous plate 10 ... Through-hole 11 ... Cylinder 12 ... Top plate DESCRIPTION OF SYMBOLS 13 ... Rib 14 ... Vacuum dehydration piping 14A ... Branch path 15 ... On-off valve 16 ... Vacuum tank 17 ... Vacuum pump 18 ... Spring 19 ... Cam 20 ... Crank 21 ... Wire mesh 22 ... Wire mesh S ... Molded product

Claims (4)

[Claims] 1. An upper surface of a molded article (S) is pressed by a dehydrator (6) having a number of dehydration holes (8), and the dehydration holes (8) of the dehydrator (6) are suctioned in vacuum to dehydrate. A movable perforated plate that is thinner than the dehydrator (6)
(9) is laminated so that it can be separated from the dehydrating machine (6), the molded article (S) is dewatered and formed through the movable porous plate (9), and the dewatered molded article (S) is dewatered ( When the mold is removed from 6), the movable perforated plate (9) is separated from the dehydrator (6), and water remaining in the dehydration holes (8) of the dehydrator (6) is suctioned and removed by vacuum. A dehydration molding press characterized by the following. 2. The dewatering press according to claim 1, wherein the movable perforated plate (9) is a metal plate having a large number of through holes (10). 3. The dewatering press according to claim 1, wherein the movable perforated plate (9) is connected to the dehydrator (6) via a cylinder (11). 4. The upper surface of the molded article (S) is pressed by a dehydrator (6) having a number of dehydrating holes (8), and the dehydrating holes (8) of the dehydrator (6) are suctioned in vacuum to dehydrate. In the dehydration molding method, a movable porous plate thinner than the dehydrator (6) is provided on the lower surface of the dehydrator (6).
(9) is laminated so that it can be separated from the dehydrating machine (6), the molded article (S) is dewatered and formed through the movable porous plate (9), and the dewatered molded article (S) is dewatered ( When removing the movable perforated plate (9) from the dehydrator (6) when removing the mold from the dehydrator (6), the water remaining in the dehydration holes (8) of the dehydrator (6) should be removed by vacuum suction. Characteristic dehydration molding method.