JPH10273356A - Inorganic molded plate, manufacturing method thereof and forming apparatus - Google Patents

Abstract

(57) [Summary] An object of the present invention is to provide an inorganic molded plate which is excellent in dimensional stability, fire resistance and freeze-thaw resistance, and maintains strength. SOLUTION: A single-layer inorganic molded plate composed of a cured product of a mixture containing a curable inorganic material, glass fiber, and a wood reinforcing material, and curing of a mixture containing a curable inorganic material and an essential reinforcing material. An inorganic molded plate having a three-layer structure comprising a front and back layer made of a material, and a core layer made of a cured product of a mixture containing a curable inorganic material, glass fiber, and a wood reinforcing material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic molded plate suitable for building materials and having excellent performance such as dimensional stability.

[0002]

2. Description of the Related Art Conventionally, there has been provided an inorganic molded plate using a hardening inorganic material such as cement as a building material. In order to improve the strength and reduce the weight of the inorganic molded plate, a wood fiber is generally blended with the curable inorganic material. Further, in order to increase the impact strength of the inorganic molded plate, an organic synthetic fiber may be blended.

[0003]

However, when only wood fibers are blended as a fiber reinforcing material, there is a problem that the dimensional change of the substrate is relatively large due to swelling due to water absorption or the like. Also for fire protection and freeze-thaw resistance,
There is a tendency for the behavior of wood fibers to be affected. Organic synthetic fibers, on the other hand, have a smooth surface and a low affinity for the inorganic matrix and water, and therefore have low adhesion to the inorganic matrix. Therefore, when only organic synthetic fibers are blended as the fiber reinforcing material, there is a problem that the bonding strength of the inorganic matrix is weak and the bending strength is greatly reduced.
The outer wall surface of a house, which is a shelter of a living space, is required to be excellent in durability, weather resistance, fire resistance, etc. so that people can live a healthy and comfortable life. Accordingly, an object of the present invention is to provide an inorganic molded plate which is excellent in dimensional stability, fire resistance and freeze-thaw resistance, and which maintains strength.

[0004]

Means for Solving the Problems In view of the above problems, as a result of intensive studies, the present inventors have found that by using a combination of glass fiber and wood reinforcing material as a reinforcing material, dimensional stability and fire resistance can be improved. And excellent freeze-thaw resistance,
The present inventors have found that an inorganic molded plate having high strength can be obtained, and have completed the present invention.

That is, the present invention comprises an inorganic molded plate comprising a cured product of a mixture containing a curable inorganic material, glass fiber and a wood reinforcing material, and further comprises a curable inorganic material and an essential reinforcing material. The present invention provides an inorganic molded plate having a three-layer structure including a front and back layer composed of a cured product of a mixture, and a core layer composed of a cured product of a mixture containing a curable inorganic material, glass fiber, and a wood reinforcing material. It is. The inorganic molded plate of the present invention, a raw material mixture containing a curable inorganic material, a glass fiber and a wood reinforcing material, is sprayed on a template to form a mat, and is cured by pressing in the presence of moisture. It is preferable to produce the glass fibers by a semi-dry method, but more preferably, the glass fibers are sprayed on a template so that the orientation of the glass fibers is kept constant. When producing a three-layer inorganic molded plate, a mixture for the front and back layers containing a curable inorganic material and a wood reinforcing material is sprayed on a template to form a front or back layer mat, and the front or back surface mat is formed. On the layer mat,
Forming a core layer mat by spraying a mixture for a core layer containing a curable inorganic material, glass fiber and a wood reinforcing material,
On the core layer mat, a mixture for the front and back layers mainly composed of a curable inorganic material and an essential reinforcing material is sprayed to form the surface or back layer mat, and the resulting three-layer mat is exposed to moisture. It is preferable to manufacture the core layer mixture by a dry or semi-dry method in which the mixture is hardened and cured, and more desirably, the mixture for the core layer is coated on the surface so that the directionality of at least the glass fibers contained in the core layer is kept constant. Or spray on backing mat.
In the present invention, further, a means for spraying the raw material mixture is arranged at the upper part of the chamber, a template is conveyed and introduced at the lower part of the chamber, and between the means for spraying the material mixture and the template,
There is also provided a forming device in which a vibrating sieve provided with a number of slits is interposed so as to vibrate in a direction orthogonal to the slits.

The weight ratio of the glass fiber to the wood reinforcing material is desirably 1: 0.25 to 1: 1. The glass fiber is desirably an alkali-resistant glass fiber. Is preferably 8 to 35 mm, and the glass fiber is preferably chopped strand.
In addition, as a method of keeping the directionality of the glass fiber constant, for example, a plurality of slits are used, and the raw material mixture is sprayed while being sieved using a sieve vibrating in a direction perpendicular to the slits. Method. The raw material mixture is desirably mixed by a dry or semi-dry method.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The inorganic molded plate of the present invention mainly uses a curable inorganic material, glass fiber and a wood reinforcing material as raw materials. [Curable inorganic material] As the curable inorganic material used in the present invention, cements such as Portland cement, blast furnace cement, silica cement, fly ash cement, alumina cement, gypsum dihydrate, gypsum hemihydrate, anhydrous gypsum, slaked lime , A mixture of activated lime-containing substances such as quicklime and silica sand, silica powder, silica fume, blast furnace slag, fly ash, shirasu balloon, perlite and the like, a mixture of the above-mentioned cements and the above-mentioned silicate-containing Mixtures with substances are exemplified, the cements are hardened by a hydration reaction in the presence of water, and the mixture of the activated lime-containing substance and the silicate-containing substance is a hardened body of calcium silicate by a hydrothermal reaction. Become. In the case of a cement-silicic acid-containing substance mixture, the cement and the silicic acid-containing substance are usually mixed such that the weight ratio thereof is about 40:60 to 70:30.

[Glass Fiber] Examples of the glass fiber used in the present invention include those made of E glass, C glass, S glass, and the like. Alkaline glass fiber (AR
It is desirable to use G). Glass fiber length is 8 ~
Preferably, it is 35 mm. If the fiber length is less than 8 mm, the reinforcing effect of the inorganic molded plate is reduced, and if it exceeds 35 mm, the fibers are cut in the mixing step with other raw materials, or fiber balls are formed by entanglement with wood fibers. This is because there is a fear. Particularly desirable fiber length is 10-35mm
It is. Note that glass fibers having a plurality of different fiber lengths may be used. Glass fibers are desirably used as chopped strands in view of the strength of the inorganic molded plate. The strand is desirably a bundle of 50 to 400 single fibers having a diameter of 13.5 to 18.0 μm. The sizing agent is not particularly limited, but for example, a vinyl acetate-based sizing agent can be used.

[Wood Reinforcing Material] Examples of the wood reinforcing material used in the present invention include wood flour, wood fiber, pulp, wood fiber bundle, wood wool, wood chip, bamboo fiber, hemp fiber and the like. Desirable wood reinforcements are wood fibers and wood fiber bundles,
Particularly desirable are wood fiber bundles that have been bulked by branching and / or bending and / or bending. The bulky wood fiber bundle desirably has a main trunk diameter of about 0.1 to 2.0 m.
m, the actual length of the main trunk is about 2-35 mm, more preferably 10-30 mm
And the bulk specific gravity is in the range of about 0.03 to 0.05 g / cm ³ . Such a bulky wood fiber bundle is particularly useful as a wood reinforcing material used for the core layer of a three-layer inorganic molded plate. In order to manufacture the bulky wood fiber bundle, wood is immersed in a chemical such as sodium hydroxide, sodium sulfite, calcium sulfite, or the wood is heated with steam, or the above-described chemical immersion and steam heating are used in combination. By swelling without completely dissolving lignin, hemicellulose, resin, and the like, which serve as a binder for the woody monofilament contained in the wood, and defibrating while leaving the binder. I just need. The thus defibrated fiber has a larger diameter than the pulp fiber which has been defibrated by substantially completely removing lignin from the binder.
The defibration is performed by, for example, a grinding disk, and the degree of defibration is adjusted by adjusting the interval between the grinding disks.

[0010] The bulky wood fiber bundle is branched and / or curved and / or bent, so that the excluded volume is large and thus gives a bulky and low density inorganic molded plate (core layer). Since it is strong, a structure having a small density but a large strength can be obtained. Other desirable wood reinforcements are rigid fibers such as bamboo fibers, hemp fibers and the like. Such a rigid fiber is particularly useful as a wood reinforcing material for the core layer because it provides a structure having a small density but a high strength due to its rigidity, similarly to the bulky wood fiber bundle.

[Other components] The inorganic molded plate of the present invention contains magnesium chloride, magnesium sulfate, calcium chloride, calcium sulfate, sodium aluminate as components other than the curable inorganic material, glass fiber and wood reinforcing material. Hardening accelerators such as potassium aluminate, aluminum sulfate and water glass; mineral powders such as vermiculite and bentonite; water repellents such as wax, paraffin and silicon; reinforcing materials such as synthetic resin emulsions; foamable thermoplastic plastic beads; plastic A foam or the like may be added. The above examples do not limit the invention.

[Composition of Inorganic Molded Plate] In the inorganic molded plate of the present invention, the weight ratio of the curable inorganic material to the mixed reinforcing material of glass fiber and wood reinforcing material is usually 82:18 to
70:30. When the ratio of the mixed reinforcing material is less than the above range, the reinforcing effect is not sufficient, and when it exceeds the above range, the consolidation of the curable inorganic material is hindered, and the strength tends to decrease. The weight ratio of glass fiber to wood reinforcement is preferably from 1: 0.25 to 1: 1. When the ratio of the glass fibers is less than the above range, the effects of the present invention, that is, the effects of excellent dimensional stability, fire resistance and freeze-thaw resistance are difficult to obtain, and when the ratio of the glass fibers exceeds the above range, In addition, the weight increases and the bending strength also decreases. When the inorganic molded plate has a three-layer structure, the weight ratio of the curable inorganic material to the wood reinforcing material in the front and back layers is usually 90:10 to 80:20.
And When the ratio of the wood reinforcing material is less than the above range, the reinforcing effect of the wood reinforcing material is not sufficient, and when it exceeds the above range, the fire resistance becomes insufficient. The weight ratio of the curable inorganic material in the core layer to the mixed reinforcing material of the glass fiber and the wood reinforcing material is the same as in the case of the single layer. In order to enhance the design, the front and back layer parts are desirably made dense by increasing the density, and the core layer part is desirably increased in strength and reduced in density by making it lighter in weight to provide cushioning properties. . For this purpose, it is desirable to use, as at least the wood reinforcing material for the front and back layers, a wood reinforcing material containing 30 to 70% by weight of wood flour of 2 mm or less. On the other hand, it is desirable to use, as the core layer, a combination of glass fiber and a wood reinforcing material, particularly a rigid fiber such as the above-mentioned bulky wood fiber bundle, bamboo fiber, and hemp fiber.

In order to further reduce the density of the core layer, inorganic fine hollow bodies such as fly ash, shirasu balloon, pearlite, glass balloon, etc., inorganic foams such as pumice granules, ALC crushed products, etc., and plastic foams Or the like, or an organic hollow body or foamable thermoplastic plastic beads.

In the case of an inorganic molded plate having a three-layer structure, the desirable composition of the main raw materials for the front and back layers and the core layer is as follows. Front and back layers: Cement and activated lime-containing substance 30 to 60% by weight Silicic acid-containing substance 30 to 55 〃 Wood flour (sieve 2 mm or less) 5 to 10 〃 Other wood reinforcing material 5 to 10 芯 Core layer: Cement and Activated lime-containing material 30-59% by weight Silicic acid-containing material 25-54 〃 Glass fiber 8-20 〃 Wood reinforcement 8-20 〃 Hollow body 0-20 厚 み The thickness of the front and back layers of the inorganic molded plate of the present invention is It is desirable that the thickness be 10 to 30% of the total thickness in consideration of the design properties, strength, and the like of the inorganic molded plate.

In the inorganic molded plate of the present invention, since a glass fiber and a wood reinforcing material are used in combination as the reinforcing material, the dimensional stability is high, and the fire resistance and the freeze-thaw resistance are excellent. In particular, there is an advantage that the dimensional change rate due to water absorption is small. Also, as compared with those made entirely of glass fibers, they are superior in terms of lightness, bending strength and the like. In the case of an inorganic molded plate using fine wood flour having a mesh size of 2 mm or less as a wood reinforcing material for the front and back layers, even if an uneven pattern is formed on the surface, the surface has a substantially uniform and dense structure, and a coarse structure portion is not formed. Become like In addition, an inorganic molded board using a rigid fiber such as a bulky wood fiber bundle, bamboo fiber, or hemp fiber which is bulked by branching and / or bending and / or bending as a wood reinforcing material of the core layer portion, Although the structure becomes coarse and low density,
The mechanical strength increases due to the entanglement and rigidity of the fibers.

[Manufacture of Inorganic Formed Plate] As a method of manufacturing an inorganic formed plate of the present invention, it is desirable to employ a dry or semi-dry method in which the process can be easily performed and the apparatus is simple.
The dry method is a method in which a raw material mixture is sprayed on a lower mold plate to form a mat, which is added to the mat and is cured by pressing. The semi-dry method adjusts the water content to 25 to 45% by weight. This is a method in which the raw material mixture is sprayed on a lower mold plate to form a mat, and then cured by pressing and curing. At this time, it is desirable that the raw material mixture is sprayed so as to keep the directionality of the fiber reinforcing material, particularly the glass fiber constant. By maintaining the directionality of the fibers in this manner, excellent strength can be imparted to the inorganic molded plate. As a method of keeping the directionality of the fiber reinforcing material constant, for example, a vibrating sieve provided with a number of slits is interposed so as to vibrate in a direction perpendicular to the slits to orient the fibers in the raw material mixture. There is a method of spraying. In the continuous manufacturing method,
A large number of the lower mold plates are placed on a belt conveyor.
The mat of the raw material mixture sprayed on the lower mold plate is slightly pressed by a roll or the like as required, and the upper mold plate is placed on the upper surface of the mat.

Next, the mat is press-hardened and pre-cured in the presence of moisture to form a desired shape. The pressing pre-curing is usually performed at a pressing pressure of 10 to 30 kg / cm ² , at a temperature of 60 to 80 ° C. for a time of about 10 to 30 hours, and heating is usually performed with steam. Pressing is performed by sandwiching the mat between two upper and lower mold plates,
An uneven pattern is provided on the template surface of the upper mold plate and / or the lower mold plate as required.

The pre-cured product obtained by the above-mentioned press-curing pre-curing is cured in an autoclave. The curing conditions are usually a temperature of 160 to 200 ° C. and a time of 5 to 10 hours. By this autoclave curing, the calcium silicate reaction between the activated lime-containing substance and the silicic acid-containing substance is completely performed. As described above, if desired, the inorganic molded plate of the present invention having a concavo-convex pattern in which the concavo-convex pattern of the upper mold plate and / or the lower mold plate is reverse-transferred on both surfaces or one surface thereof is produced.

In the case of producing a three-layer inorganic molded plate by the above-mentioned semi-dry method, the raw material mixture of the front and back layers (hereinafter referred to as mixture A) is sprayed on a lower mold plate in a mat form, and then the mixture is spread thereon. Then, the raw material mixture of the core layer (hereinafter referred to as mixture B) is sprayed in a mat shape, and the mixture A is further sprayed thereon in a mat shape. The mixture A and the mixture B are each added with 25 to 45% by weight of water for a curing reaction.
When forming the mat of the core layer, it is desirable to spray the fibers while orienting the fibers with a sieve as described above.
Then, the three-layer mat is pressed and cured in the same manner as described above. When the branched and / or curved and / or bent bulky wood fiber bundle is used as the wood reinforcing material of the mixture B, the mixture B is easily loosened and easily spread on the lower mold plate.

[Forming Apparatus] FIG. 1 (side view) shows a specific example of a forming apparatus capable of manufacturing an inorganic molded plate having a three-layer structure according to the present invention. The forming apparatus in this specific example includes a forming chamber 1a for forming the front and back layers, a forming chamber 1b for forming the core layer, and a forming chamber 1b for forming the front and back layers.
c, and each forming chamber 1a, 1b, 1
A conveyor belt conveyor 2 is installed at the bottom of c.
A lower mold plate 3 having an uneven pattern on its surface is arranged on the conveyor belt conveyor 2, and the lower mold plate 3 is conveyed by the conveyor belt conveyor 2 in the direction of arrow a.

Each forming chamber 1a, 1b, 1
The supply belt conveyors 4a, 4b, 4c are disposed above the upper supply brushes 5a, 5b, 5c at the ends of the supply belt conveyors 4a, 4b, 4c, and the lower supply brushes 6a, 6b at the lower side. , 6c are arranged to constitute a spraying device. Also, the supply belt conveyors 4a, 4b,
Material feed conveyors 41a, 41b, 41c are arranged above the feed belt 4c, and feed material conveyors 4a, 4b feed the feed materials.
b, 4c.

Each of the forming chambers 1a,
On one side of 1b, 1c, casings 71a, 71b, 71
c, and main air blowers 7a, 73b, 73c each including a blower 72a, 72b, 72c housed in the air blower 72a, 72b, 71c, and a blower opening 73a, 73b, 73c communicating with the blower 72a, 72b, 71c via distribution ducts 74a, 74b, 74c. 7b and 7c are arranged. The air outlet 73
a, 73b, 73c, the air outlets 73a, 73b, 73
In order to collect and circulate the air blown from c,
The circulation paths 81a, 81b, 81c and the circulation paths 81a, 81b,
A sub-blower 83a, 83b, 83c communicating with the duct 81a via ducts 82a, 82b, 82c is arranged.
a, 83b, 83c from the air outlets 84a, 84b, 84c
Wind is blown in the directions of 73a, 73b and 73c. Further, the forming chambers 1a, 1
In sieves b and 1c, sieve bodies 9a, 9b and 9c are installed so as to be opposed to the air outlets 73a, 73b and 73c. The sieve bodies 9a and 9c are installed so that the inclination angle can be adjusted and can be moved back and forth, and the sieve body 9b is installed so that the inclination angle can be adjusted and can be moved back and forth and can be vibrated left and right. A desirable inclination angle of the sieve body 9b is 10 to 30 °.

FIG. 2 shows a front view of the sieve body 9b including the forming chamber 1b. The sieve body 9b in this specific example is suspended by three suspension wires 91 at both sides of the front end and at the center of the rear end. Sieve body 9b
A substantially central portion on one side (left in the figure) is connected to a vibrating cam 93 via a vibrating rod 92. The body 9b reciprocates in the arrow Z direction.

FIGS. 3 and 4 show a specific example of the structure of the sieve body 9b.
The details are shown below. FIG. 3 is a plan view, and FIG. 4 is a side view. The sieve body 9b is formed by passing a plurality of sieve bars 902 into a square sieve frame 901 assembled using bolts 900,
A space (slit) 903 is formed between the sieve bars 902. Hanging wire connecting rings 904, 904 ′, 904 ″ to which the above-mentioned hanging wires 91 are connected are installed at the both sides of the front end (left side in the figure) and the rear end (right side in the figure) of the sieve body 9b. Have been. Further, a vibrating rod connecting ring 905 to which the vibrating rod 92 can be connected is provided at the center of both sides of the sieve body 9b. The vibrating rod connecting ring 905 may be installed on only one side of the sieve body 9b. FIG. 5 shows a cross-sectional view of the sieve bar 902. The sieve bar 902
The upper side has a mountain shape in order to favorably orient the raw materials to be sprayed. The number, interval, and the like of the sieve bars 902, or the vibration frequency, vibration width, and the like of the sieve body 9b may be set as appropriate according to the diameter and amount of the glass fibers (strands) contained in the material to be sprayed.

[Use of Forming Apparatus] A method of manufacturing an inorganic molded plate using the above-described forming apparatus will be described. First, the raw material mixture A whose water content is adjusted is dropped from the raw material transport conveyor 41a onto the supply belt conveyor 4a. The raw material mixture A is transported in the direction of arrow B by the supply belt conveyor 4a, and the upper end of the supply belt conveyor 4a is rotated by the upper supply brush 5a rotating in the direction of arrow C and the lower supply brush 6a rotating in the direction of arrow C '. Forming chamber 1 while loosening raw material mixture A
Drop from the later stage in a.

The raw material mixture A dropped into the forming chamber 1a is first oriented in the front direction as indicated by arrow E by the wind blown in the front direction indicated by arrow d from the blowing port 73a of the main blower 7a. . The oriented raw material mixture A is then sieved by the sieve body 9a and further selected by the wind blown from the air outlet 73a. Then, the finer powder in the raw material mixture A falls and deposits on the lower mold plate 3 in the former stage in the forming chamber 1a, and the coarser powder is deposited in the lower mold plate in the later stage in the forming chamber 1. 3 and fall and deposit.

More specifically, the fine powder is slightly rearwardly blown by the air blown from the blower opening 84a of the sub-blower 83a to the rearward direction shown by the arrow G just above the lower mold plate 3 as shown by the arrow H. Orientation. Then, the coarsest powder is caught by the sieve body 9a, and then falls from the sieve body 9a as shown by an arrow, and is deposited on the lower mold plate 3 at the last stage in the forming chamber 1a. The lower mold plate 3
Is transported from the former stage to the latter stage in the forming chamber 1a by the conveyor belt conveyor 2 as described above, so that the finest powder is placed on the lower mold plate 3 at the lowest position (the front and back surfaces of the inorganic molded plate). Is deposited, and powder with a coarser particle size is deposited upward (toward the core layer of the inorganic molded plate). In this way, the surface layer or the back layer mat having a structure in which the particle size becomes finer as it goes down is formed.

Next, the raw material mixture B having the adjusted water content is
The material is dropped from the material transport conveyor 41b onto the supply belt conveyor 4b. The feed mixture B is conveyed by the supply belt conveyor 4b in the direction indicated by the arrow, and the upper supply brush 5b that rotates in the direction indicated by the arrow at the end of the supply belt conveyor 4b.
The raw material mixture B is loosened by the lower supply brush 6b rotating in the direction of arrow ヌ ', and is dropped from the former stage in the forming chamber 1b.

The raw material mixture B that has fallen into the forming chamber 1b is oriented in the downstream direction as shown by the arrow ヲ by the wind blown in the downstream direction shown by the arrow from the blower port 73b of the main blower 7b. After passing through the sieve body 9b, the oriented raw material mixture B falls and deposits on the lower mold plate 3. At this time, as shown in FIG. 2, since the sieve body 9b is reciprocatingly vibrating in the direction of arrow Z via the vibrating rod 92 by the rotating vibrating cam 93, the fiber reinforcing material in the raw material mixture B is in the front-rear direction. Drops and accumulates on the lower mold plate 3 while imparting properties. Since the inclination angle of the sieve body 9b is set smaller than the inclination angle of the sieve body 9a, there is almost no difference in the drop position depending on the size of the particles in the raw material mixture B. In this manner, a core layer mat in which the directionality of the fiber reinforcement in the front-rear direction is kept substantially constant is formed on the surface layer or the back layer mat.

Finally, the raw material mixture A having the adjusted moisture content
Is formed on the core layer mat in the same manner as in the raw material mixture A. However, forming chamber 1a
Since the front and back mats obtained in the forming chamber 1c are opposite to the front and back mats obtained in the forming chamber 1a, the lower and upper mats (the core of the inorganic molded plate) The coarsest powder is deposited on the (layer side), and has a structure in which the particle size becomes finer toward the upper side (front or back of the inorganic molded plate).

[0031]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples, but the scope of the present invention is not limited to these Examples. Examples 1 to 3 and Comparative Examples 1 and 2 (1) The composition of the mixture A (front and back layers) was as follows. Portland cement 47.5% by weight Silica sand 31.7% by weight Wood chips ^{* 1} 13.8% by weight Wood powder ^{* 2} 6.0% by weight Pulverized broken plate 1.0% by weight * 1: Average sieve 4.5 mm, average Thickness 0.6 mm * 2: Sieve 2 mm or less In addition, magnesium chloride was used as a hardening accelerator in an amount of 2.0% by weight based on cement, and a paraffin emulsion was used as a waterproofing agent in an amount of 0.35% by weight based on solid content.

(2) The composition of the mixture B (core layer) was as follows. Sample 1 (Example 1) Portland cement 32.8% by weight Coal ash 21.8% by weight Wood chips ^{* 1} 4.6% by weight Inorganic lightweight body ^{* 2} 2.3% by weight Pulverized broken plate 27.2% by weight Wood fiber ^{* 3} 2.8% by weight glass fiber ^{* 4} 8.5% by weight Sample 2 (Example 2) Portland cement 32.8% by weight Coal ash 21.8% by weight Wood chips ^{* 1} 4.6% by weight Inorganic lightweight body ^{* 2} 2.3% by weight Pulverized broken plate 27.2% by weight Wood fiber ^{* 3} 5.7% by weight Glass fiber ^{* 4} 5.7% by weight Sample 3 (Example 3) Portland cement 32.8% by weight Coal ash 21. 8% by weight Wood chip ^{* 1} 4.6% by weight Inorganic lightweight body ^{* 2} 2.3% by weight Pulverized broken plate 27.2% by weight Wood fiber ^{* 3} 8.5% by weight Glass fiber ^{* 4} 2.8% by weight Sample 4 (Comparative example 1) Portland cement 32.8% by weight coal ash 21.8 wt% wood ^* 1 4.6 wt% Mu Lightweight body ^* 2 2.3 wt% damage plate pulverized product 27.2 wt% wood fiber ^* 3 0.0 wt% glass fiber ^* 4 11.3 wt% Sample 5 (Comparative Example 2) Portland cement 32.8% by weight Coal ash 21.8% by weight Wood chips ^{* 1} 4.6% by weight Inorganic lightweight body ^{* 2} 2.3% by weight Pulverized broken plate 27.2% by weight Wood fiber ^{* 3} 11.3% by weight Glass fiber ^{* 4} 0.0 % By weight * 1: Average sieve 4.5 mm, average thickness 0.6 mm * 2: Brain value 3200 cm ² / g * 3: Branching and / or bending and / or bending of average fiber diameter 1.0 mm, fiber length 8 to 35 mm Bulky wood fiber bundle * 4: ARG, chopped strand, fiber length 8 to 35 mm single fiber (diameter 13.5 μm) x 200, sizing agent: vinyl acetate system Magnesium chloride as a curing accelerator is 2.0 weight per cement %, And a paraffin emulsion was used as a waterproofing agent in an amount of 0.35% by weight based on the solid content.

(3) Using the above mixtures A and B,
The mat was formed by the forming apparatus shown in FIG. To each of the mixtures A and B, 28 to 35% by weight of water was added, the thickness of the surface mat was 13.6% of the sample thickness, the thickness of the core layer mat was 72.8% of the sample thickness, and the thickness of the back layer mat was 13.6% of the sample thickness. %
Forming was performed so that The upper mold plate is brought into contact with the obtained three-layered mat, and the pressing pressure is 26 kgf.
/ cm ² after pressing at a temperature of 70 ° C. in the curing chamber, relative humidity
It was cured by heating at 95% or more for 8 hours. After the mold was released, it was cured again under high temperature and pressure (165 ° C., 6.2 kgf / cm ² ) for 7 hours.

(4) Samples 1 to 5 manufactured as described above
The absolute specific gravity, thickness, bending strength, water absorption, water absorption swelling ratio, water absorption dimensional change ratio, freeze-thaw thickness swelling ratio, and fire prevention performance were measured and evaluated. Flexural strength is JIS A-1408
The water absorption is measured after immersion for 24 hours in accordance with JIS A-5905, and the water absorption dimensional change is measured according to JIS.
Measured after immersion for 24 hours in accordance with A-5414, freeze-thaw thickness swelling ratio was measured after 30 cycles in accordance with JIS A-1435,
The back surface temperature of the inorganic molded plate was measured according to IS A-1321. Table 1 shows the measurement results.

[0035]

[Table 1]

As shown in Table 1, the inorganic molded plates of Samples 1 to 3 have a small dimensional change due to water absorption, have excellent freeze-thaw performance, and have a constant bending strength. On the other hand, the inorganic molded plate of Sample 4 has excellent water absorption dimensional stability and freeze-thaw performance, but has low bending strength and specific gravity of 1%.
It is getting bigger. Further, the inorganic molded plate of Sample 5 has high bending strength, but is inferior in water absorption dimensional stability, freeze-thaw performance and fire resistance.

[0037]

According to the present invention, it is possible to obtain an inorganic molded plate which is excellent in dimensional stability, fire resistance and freeze-thaw resistance and maintains a certain strength.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a specific example of a forming apparatus of the present invention.

FIG. 2 shows a sieve body (and a forming apparatus) according to the present invention.
It is a schematic front view which shows one specific example.

FIG. 3 is a plan view showing a specific example of the sieve body in the present invention.

FIG. 4 is a side view showing a specific example of the sieve body in the present invention.

FIG. 5 is a sectional view showing a specific example of a sieve bar in the present invention.

[Explanation of symbols]

 1a, 1c: a forming chamber for forming front and back layers 1b: a forming chamber for forming a core layer 2 ... a conveyor belt conveyor 3 ... a lower mold plate 4a, 4b, 4c ... a supply belt conveyor 41a, 41b, 41c ... a raw material conveyor 5a, 5b, 5c: Upper supply brush 6a, 6b, 6c: Lower supply brush 7a, 7b, 7c: Main blower 71a, 71b, 71c: Casing 72a, 72b, 72c: Blower 73a, 73b, 73c: Blower outlet 74a, 74b , 74c ... distribution ducts 81a, 81b, 81c ... circulation paths 82a, 82b, 82c ... ducts 83a, 83b, 83c ... sub-blowers 84a, 84b, 84c ... blowers 9a, 9c ... sieve bodies 9b ... sieves capable of right and left vibration Body 91… Suspension wire 92… Vibration rod 93… Vibration cam 900… Bolt 901… Sieving frame 902… Sieving rod 903… Void space (slit) 904,904 ', 904 ”… Suspension wire connection ring 905… Vibration rod connection ring, B ... raw material mixture

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C04B 18:26)

Claims (13)

[Claims] 1. An inorganic molded plate comprising a cured product of a mixture containing a curable inorganic material, glass fiber, and a wood reinforcing material. 2. The inorganic molded plate according to claim 1, wherein at least the glass fibers are oriented in a substantially constant direction. 3. A front and back layer comprising a cured product of a mixture containing a curable inorganic material and an essential reinforcing material, and a core layer comprising a cured product of a mixture containing a curable inorganic material, glass fiber and a wood reinforcing material. And an inorganic formed plate. 4. The inorganic molded plate according to claim 3, wherein at least the glass fibers are oriented in a substantially constant direction. 5. The inorganic molded plate according to claim 1, wherein a weight ratio of the glass fiber to the wood reinforcing material is 1: 0.25 to 1: 1. 6. The inorganic molded plate according to claim 1, wherein the glass fiber is an alkali-resistant glass fiber. 7. The inorganic molded plate according to claim 1, wherein the glass fiber has a fiber length of 8 to 35 mm. 8. The inorganic molded plate according to claim 1, wherein said glass fiber is chopped strand. 9. A mat is formed by spraying a raw material mixture containing a curable inorganic material, glass fiber, and wood reinforcing material on a template so that at least the direction of the glass fiber is kept constant. And a press-curing curing in the presence of moisture. 10. In order to keep the directionality of the glass fiber constant, a vibrating sieve provided with a number of slits is interposed so as to vibrate in a direction perpendicular to the slits, and the raw material mixture is sprayed. The method for producing an inorganic molded plate according to claim 9, wherein: 11. A front or back layer mat containing a curable inorganic material and an essential reinforcing material is sprayed on a template to form a front or back layer mat, and on the front or back layer mat,
A mixture for a core layer containing a curable inorganic material, glass fiber, and a wood reinforcing material is sprayed so that at least the direction of the glass fiber is kept constant, and the core layer mat is formed, and the core layer mat is formed. On top, a mixture for the front and back layers containing a curable inorganic material and an essential reinforcing material is sprayed to form a surface or back layer mat, and the resulting three-layer mat is pressed and cured in the presence of moisture. A method for producing an inorganic molded plate. 12. A mixture for the core layer in which a vibrating sieve provided with a number of slits is interposed so as to vibrate in a direction perpendicular to the slits in order to keep the directionality of the glass fiber constant. 12. The method of claim 11, wherein
A method for producing an inorganic molded plate according to the above. 13. A means for dispersing a raw material mixture is disposed in an upper part of the chamber, a template is conveyed and introduced in a lower part of the chamber, and a dispersing means for dispersing the material mixture and the template are provided between the means.
A forming device in which a vibrating sieve provided with a number of slits is interposed so as to vibrate in a direction orthogonal to the slits.