JP4536609B2 - Manufacturing method and apparatus for woody cement board - Google Patents

Description

  The present invention relates to a method and an apparatus for producing a wood-based cement board obtained by mixing and compressing a wood material such as wood wool and wood chips as a main material and cement paste.

For example, as specified in JIS A 5404, wood-based cement boards are compression-molded using wood raw materials such as wood wool and wood chips and cement (cement paste) as main raw materials, mixed and then compression-molded. It is a plate material.
This wood-based cement board is tough even though the bulk specific gravity is about 0.5 to 0.6. In addition to being excellent in fire resistance, it is also excellent in heat insulation, and when used as a building material, it is cool in the summer and warm in the winter. Moreover, it has excellent acoustic characteristics by blocking external noise and absorbing indoor reverberation.

By the way, in order to increase the heat insulation and toughness (bending strength, etc.) of the wood-based cement boards so that they can be used as building materials such as ceiling materials and under-floor materials, the wood materials are intertwined in the cement. It must be manufactured so that there are no through holes in the thickness direction.
Therefore, it is considered to spend sufficient time for the mixing work so that the wood raw materials are closely entangled in the cement paste, and to use a special wood raw material manufacturing apparatus to generate a predetermined length of wood raw materials. However, if this is done, it takes a lot of time and effort to produce the wood-based cement board, and the production cost of the wood-based cement board may increase.
This invention is made | formed in view of the said situation, and it aims at providing the manufacturing method and apparatus of the wood type cement board which can improve heat insulation and toughness, suppressing manufacturing unit price. .

In order to solve the above-mentioned problems, a method for producing a wood-based cement board according to claim 1 is characterized in that a mixture obtained by mixing wood raw materials such as wood wool and wood chips and cement paste as a main raw material is a plate-like semi-molded body. In the method of producing a wood cement board by curing the half-molded body in the thickness direction and then curing for a predetermined time, the mixture is mixed with a long fiber wood raw material. A mixture containing a large amount of wood material and short fiber wood raw material, a mixture containing the long fiber wood raw material is used as a lower layer mixture, and the short fiber wood raw material is placed on the lower layer mixture. A first molding step for forming a plate-like first semi-molded body obtained by laminating the containing mixture as an upper-layer mixture, and re-molding the first semi-molded body to increase the amount of the long fiber woody material The mixed mixture is used as a lower layer mixture, and the short fiber is placed on the lower layer mixture. A plate-like second laminate in which a mixture containing a large amount of wood raw material is laminated as an intermediate layer mixture, and a mixture containing a large amount of wood raw material in the long fibers is laminated as an upper layer mixture on the intermediate layer mixture. A second molding step for molding the semi-molded body, and in the second molding step, the upper part of the lower layer mixture and the upper layer mixture which are the upper side in the thickness direction of the first semi-molded body Of the wood-based cement board, wherein the laminated state of the mixture containing a large amount of the long fiber wood raw material and the mixture containing the short fiber wood raw material is reversed . It is a manufacturing method.

The invention according to claim 2 is the method for producing a wood-based cement board according to claim 1, wherein in the first forming step, the mixture is classified into two kinds of mixtures by sieving according to the difference in the size of the wood material. I made it .

Furthermore, the invention according to claim 3 is the method for producing a wood-based cement board according to claim 1 or 2 , wherein the wood raw material is crushed unused wood or thinned wood from forests for construction or the like. Formed.
The invention according to claim 4 is the method for producing a wood-based cement board according to any one of claims 1 to 3 , wherein as a main raw material, together with the wood raw material and cement paste, a foamed resin expanded in a bead shape, Then, the foam was crushed into a predetermined size and the foamed resin was mixed to form the mixture.
The invention according to claim 5 is the method for producing a wood cement board according to any one of claims 1 to 4 , wherein the incinerated ash of the wood cement board is used as a main material together with the wood material and cement paste. Combined to form the mixture.

On the other hand, the invention according to claim 6 manufactures a wood-based cement board after molding a mixture obtained by mixing a wood raw material such as wood wool and wood chips and cement paste as a main raw material into a plate-like semi-molded body. In the apparatus, a conveyor that conveys the formed semi-molded body, and a mixture that is arranged on the upstream side of the conveyor and that contains the mixture containing a large amount of the long fiber wood material and the wood material of the short fiber. The mixture was separated into two types, and the mixture containing the long fiber wood raw material was used as the lower layer mixture, and the mixture containing the short fiber wood raw material was laminated on the lower layer mixture as the upper layer mixture. A first forming means for forming a plate-like first semi-formed body on the conveyor, and the first half-formed body formed by the first forming means is re-formed, and the long fiber woody material A mixture containing a large amount of A mixture containing a large amount of the short fiber wood raw material is laminated as an intermediate layer mixture on the layer mixture, and a mixture containing the long fiber wood raw material is formed on the intermediate layer mixture as an upper layer mixture. And a second forming means for forming the laminated plate-shaped second semi-formed body on the conveyor, and the second forming means extends in a horizontal direction perpendicular to the conveying direction of the conveyor. And a large number of rotating arrows projecting radially outward from the outer periphery of the rotating shaft, and an upper side in the thickness direction of the first semi-formed body by the rotation of the rotating arrow The upper layer mixture of the lower layer mixture and the upper layer mixture are stirred so that the lamination state of the mixture containing a large amount of the long-fiber woody material and the mixture containing the woody material of the short fiber is reversed. This is a wood cement board manufacturing apparatus characterized by the above .

The invention according to claim 7 is the wood cement board manufacturing apparatus according to claim 6 , wherein the first forming means is a cloth extending in a horizontal direction perpendicular to the conveying direction of the conveyor. And a plurality of separation bars fixed in parallel at a predetermined interval in the axial direction of the cross bar and arranged with a downward slope toward the upstream of the conveyor. By reciprocating in the axial direction, the plurality of separation bars reciprocate in a direction perpendicular to the conveying direction of the conveyor, so that a mixture containing a large amount of long fiber wood material and a large amount of short fiber wood material are obtained. Sifted mixture was included.

As described above, according to the method for producing a wood-based cement board according to claims 1 to 5 , the produced wood-based cement board has a large amount of long-fiber wood material on both sides in the thickness direction, and the short fibers Since there are many wood raw materials in the center in the thickness direction, when a bending load is applied in the thickness direction of the wood cement board, both sides in the thickness direction where the tensile force acts are intertwined with each other. The tensile strength is increased by the long fiber wood raw material, and the compressive strength is increased by the short fiber wood raw material that is densely present in the central portion in the thickness direction where the compressive force acts. The toughness increases, and it is suitable as a building material such as a ceiling material and an underfloor material. In addition, because there are many wood raw materials for short fibers in the center of the wood-based cement board in the thickness direction, there are almost no through-holes penetrating on both sides in the thickness direction, so heat insulation is excellent. It can be used as a board.

Moreover, in the manufacturing method of the wood type cement board of this invention, since the 1st semi-molded body 14 is shape | molded in a 1st shaping | molding process, and a 1st semi-molded body is reshaped in a 2nd shaping | molding process. A complicated manufacturing process is not required, and the manufacturing unit cost of the wood-based cement board can be reduced.
Moreover, according to the manufacturing apparatus of the wood type cement board of Claim 6 and Claim 7 , the 1st half-molded body and the 2nd half-molded body are automatically shape | molded on the conveyor, and manufacturing work is large. Therefore, it is possible to further reduce the manufacturing unit price of the wood-based cement board.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the principal part of the manufacturing apparatus of the wood type cement board of 1 embodiment which concerns on this invention is demonstrated, referring FIGS. 1-2.
The apparatus of the present embodiment includes a conveyor 2 having a horizontal direction from the right side to the left side in FIG. 1 as a transport direction, a first mixer 10 disposed on the upper upstream side of the conveyor 2, and a first mixture metering feeder 12. And the first mixture fractionator 16, the reverse layer molding machine 20 disposed on the downstream side of the conveyor 2 from the first mixture fractionator 16, and the downstream side of the conveyor 2 from the reverse layer molding machine 20. The first surface leveling machine 22, the second mixer 24, the second mixture metering feeder 26, and the second mixture fractionation arranged downstream of the conveyor 2 from the first surface leveling machine 22 And a second surface leveler 30 disposed on the downstream side of the conveyor 2 from the second mixture separator 28.

The first mixer 10 mixes the wood raw material 4 and the cement paste 6 to generate a mixture 8. Here, the wood raw material 4 is formed using raw wood as a raw material, and the raw material 4a (hereinafter referred to as the long fiber raw material 4a) having a long length in the fiber direction (for example, about 50 to 150 mm in length) or There is a raw material 4b having a short length in the fiber direction (for example, a length of about 5 to 15 mm) (hereinafter, the short raw material is referred to as a short fiber raw material 4b).
The 1st mixture fixed quantity supply machine 12 has stored the mixture 8 produced | generated by the 1st mixer 10, and directs the predetermined amount of the mixture 8 to the lower conveyor 2 from the supply opening provided in the lower part. Supply.
The first mixture sorter 16 forms the first semi-formed body 14 on the conveyor 2. The first semi-molded body 14 will be described later.

  As shown in FIG. 2, the first mixture separator 16 has a crossbar 16a extending in the horizontal direction perpendicular to the conveying direction of the conveyor 2, and a predetermined interval in the axial direction of the crossbar 16a. A plurality of separation bars 16b1, 16b2, 16b3,... Which are fixed in parallel with each other and arranged with a downward slope (downward inclination of about 45 degrees with respect to the horizontal direction) toward the upstream of the conveyor 2. It is configured. In the first mixture separator 16, the cross bar 16 a reciprocates in the axial direction, so that a plurality of separation bars 16 b 1, 16 b 2, 16 b 3... Reciprocate in a direction perpendicular to the conveying direction of the conveyor 2. . The stroke when the cross bar 16a reciprocates is set to be equal to or greater than the interval between the sorting bars 16b1, 16b2, 16b3... And the cross bar 16a reciprocates at about 180 to 200 times / min.

  The reverse layer molding machine 20 includes a rotating shaft 20a extending in the horizontal direction perpendicular to the conveying direction of the conveyor 2, and a number of rotating arrows 20b protruding radially outward from the outer periphery of the rotating shaft 20a. It consists of And this reverse layer forming machine 20 is formed in the first mixed material separator 16 and flows to the downstream side of the conveyor 2 as the rotary arrow 20b rotates in the direction of the arrow in FIG. The upper layer of the molded body 14 is reversed, and a second semi-molded body 18 described later is molded.

The first surface leveling machine 22 has a rotating shaft 22a extending in the horizontal direction perpendicular to the conveying direction of the conveyor 2, and a number of rotations projecting radially outward from the outer periphery of the rotating shaft 22a. It consists of an arrow 22b. And the 1st surface leveling machine 22 levels the upper surface of the 2nd semi-molded product 18 because the rotation arrow 22b rotates in the arrow direction of FIG. In addition, the mixture removed from the upper surface of the second semi-molded body 18 by the rotation of the rotary arrow 22b is discharged out of the apparatus through a discharge conveyor denoted by reference numeral 23.
Similarly to the first mixer 24, the second mixer 24 mixes the wood raw material 4 and the cement paste 6 to generate the mixture 8. Moreover, the 2nd mixture fixed quantity supply machine 26 also stores the mixture 8 produced | generated by the 2nd mixer 24, and a predetermined amount of the mixture 8 is supplied to the lower conveyor 2 from the supply opening provided in the lower part. Supply towards.

  The second mixture sorter 28 forms a third semi-formed body 32 on the conveyor 2. The third semi-molded body 32 will be described later. The second mixture sorter 28 has substantially the same configuration as the first mixture sorter 16 shown in FIG. That is, the cross bar 28a extending in the horizontal direction perpendicular to the conveying direction of the conveyor 2 is fixed in parallel with a predetermined interval in the axial direction of the cross bar 28a, and as it goes downstream of the conveyor 2 It is composed of a plurality of sorting bars 28b1 (other sorting bars are omitted) arranged with a downward inclination (downward inclination of approximately 45 degrees with respect to the horizontal direction). As with the driving of the first mixture separator 16, the second mixture separator 28 reciprocates in the axial direction so that a plurality of separation bars 28 b 1 are transported in the conveyor 2. Reciprocates in a direction perpendicular to the axis. The stroke when the cross bar 28a of the second mixture separator 28 reciprocates is also set to be equal to or greater than the interval between adjacent separation bars, and the cross bar 28a is 180 to 200 times / Reciprocates in about min.

  Further, the second surface leveling machine 30 has a rotating shaft 30a extending in a horizontal direction perpendicular to the conveying direction of the conveyor 2, and a plurality of protruding outward in the radial direction from the outer periphery of the rotating shaft 30a. And a rotating arrow 30b. The second surface leveling machine 30 is configured to level the upper surface of the third semi-formed body 32 by rotating the rotary arrow 30b in the direction of the arrow in FIG. The mixture removed from the upper surface of the third semi-formed body 32 by the rotation of the rotary arrow 30b is discharged out of the apparatus via a discharge conveyor indicated by reference numeral 33.

Next, the manufacturing process of the wood-type cement board using the manufacturing apparatus mentioned above is demonstrated, referring FIGS. 1-6.
First, the wood raw material 4 and the cement paste 6 are mixed by the first mixer 10 to generate the mixture 8 (mixing process).
And the mixture 8 produced | generated by the 1st mixer 10 is stored by the 1st mixture fixed quantity supply machine 12, and the predetermined amount of the mixture 8 from this 1st mixture fixed quantity supply machine 12 becomes a 1st mixture. It is supplied to the sorter 16.

When the first mixture fractionator 16 is supplied with the mixture 8 from the first mixture fixed amount feeder 12, the separation bar 16b1, in which the mixture 8 including the short fiber raw material 4b is reciprocatingly moved. It passes between 16b2, 16b3... And falls downward. Further, after the mixture 8 including the long fiber raw material 4a does not pass between the separation bars 16b1, 16b2, 16b3, and so on, and slides on the separation bars 16b1, 16b2, 16b3, and the like toward the upstream side of the conveyor 2. It falls down. Thus, the 1st mixture sorter 16 is using the mixture 8 supplied from the mixture fixed quantity supply machine 12 for the mixture 8 containing the short fiber raw material 4b, and the mixture 8 containing the long fiber raw material 4a. The two types are supplied separately.
Thus, as shown in FIG. 3, on the conveyor 2, a lower layer mixture 14a in which most woody raw materials are long fiber raw materials 4a and an upper layer mixture 14b in which most wooden raw materials are short fiber raw materials 4b, A first half-molded body 14 is molded on the conveyor 2 (the production process of the first half-molded body).

  Next, when the first semi-formed body 14 on the conveyor 2 moves to the downstream side, the inside is stirred by the rotating arrow 20 b of the reverse layer forming machine 20. That is, the upper part of the lower layer mixture 14a and the upper layer mixture 14b of the first semi-formed body 14 are scooped and reversed by the rotating rotary arrow 20b. Accordingly, as shown in FIG. 4, on the conveyor 2, a lower layer mixture 18a in which most woody raw materials are long fiber raw materials 4a and an intermediate layer mixture 18b in which most woody raw materials are short fiber raw materials 4b. Then, the three-layered second half-molded body 18 composed of the upper-layer mixture 18c whose most woody raw material is the long-fiber raw material 4a is molded (generation process of the second half-molded body).

Next, when the second half molded body 18 on the conveyor 2 moves downstream, the upper surface of the second half molded body 18 is leveled by the rotating arrow 22b of the first surface leveling machine 22 rotating. . Then, the mixture removed from the upper surface of the second semi-formed body 18 by the rotation of the rotating arrow 22b is discharged out of the apparatus via the discharge conveyor 23.
Next, when the second semi-molded body 18 whose upper surface is leveled by the first surface leveling machine 22 moves to the downstream side, the mixture 8 separated by the second mixture sorter 28 becomes the second The third half-molded body 32 is molded by being laminated on the half-molded body 18.

  That is, when the mixture 8 is supplied from the second mixture fixed amount feeder 26 to the second mixture separator 28, the separation bar 28b1 in which the mixture 8 including the short fiber raw material 4b reciprocates. It passes between and falls downward. Moreover, the mixture 8 containing the long fiber raw material 4a does not pass between the separation bars 28b1, and falls downward after sliding on the separation bar 28b1 toward the downstream side of the conveyor 2.

As a result, as shown in the figure, intermediate layer mixing in which most woody raw material is short fiber raw material 4b between the lower layer mixture 32a and most upper layer mixture 32b in which most woody raw material is long fiber raw material 4a. A three-layered third half-molded body 32 in which the body 32c and the intermediate layer mixture 32d whose most woody raw material is the long-fiber raw material 4a are alternately laminated is formed (production process of the third half-molded body). ).
Next, when the third half molded body 32 on the conveyor 2 moves downstream, the upper surface of the third half molded body 32 is leveled by the rotating arrow 30b of the second surface leveling machine 30 rotating. . Then, the mixture removed from the upper surface of the third semi-formed body 32 by the rotation of the rotating arrow 30b is discharged out of the apparatus via the discharge conveyor 33.

Next, as shown in FIG. 6, the third half-molded body 32 that has flowed downstream of the conveyor 2 is cut into a predetermined length, and is then compression-molded in the thickness direction by a press machine 34, so Form. Next, the compression molded body 36 is initially cured for a predetermined time (about 24 h to 48 h), the compression cured body 36 that has been initially cured is flattened, and further subjected to a drying step, whereby the woody system shown in FIG. A cement board 38 is manufactured.
As shown in FIG. 7, this wood-based cement board 38 has a large amount of the long fiber raw material 4a on both sides 38a, 38b in the thickness direction (areas indicated by a and b in the board thickness direction in FIG. 7). It arrange | positions so that the long-fiber raw material 4a may get entangled. In addition, the short fiber raw material 4a is densely present in the center portion of the wood-based cement board 38 in the thickness direction (regions indicated by c and d in the board thickness direction in FIG. 7).

Therefore, in the wood-based cement board 38 of the present embodiment, there are many long fiber raw materials 4a on both sides 38a, 38b in the thickness direction, and many short fiber raw materials 4a are present in the central portion in the thickness direction. Thus, when a bending load is applied in the thickness direction of the wood-based cement board 38, the tensile strength is increased by the long fiber raw material 4a intertwined with each other on the side on which the tensile force acts (one of the both surfaces 38a, 38b), and the compression is compressed. The compressive strength of the short fiber raw material 4a, which is densely present in the central portion in the thickness direction where the force acts, increases, so that the bending strength increases and the toughness increases, and building materials such as ceiling materials and underfloor materials Can be used as
Further, since there are many short fiber raw materials 4a in the center portion in the thickness direction of the wood-based cement board 38, there are almost no through holes penetrating on both sides in the thickness direction. Therefore, it can be set as the board | plate material excellent in heat insulation.

  In the manufacturing process of the woody cement board of the present embodiment, the mixing time of the first mixer 10 and the second mixer 24 is set so that the long fiber raw material 4a and the short fiber raw material 4a are intertwined in the cement paste 6 closely. The first semi-molded product 14 is formed by the first mixture separator 16 without setting a long length or using a special wood material production apparatus to form the curled wood material 4 that is easily entangled. The second half-molded body 18 is molded by the reverse layer molding machine 20, and the third half-molded body 14 is molded by the second mixed material sorter 28. Since only the mixture layer, which is mostly the short fiber raw material 4b, is interposed between a pair of mixture layers, a complicated production process is not required, and the production cost of the wood-based cement board is reduced. Can be achieved.

  In addition, as shown in FIG. 7, the wood-based cement board according to the present invention is limited to one in which the layer in which the long fiber raw material 4a is present and the layer in which the short fiber raw material 4a is present are divided into five layers. For example, as shown in FIG. 8, in the case of producing a wood-based cement board 40 in which a layer containing a large amount of long fiber raw material 4a and a layer containing a large amount of short fiber raw material 4a are divided into three layers. Even so, the same effect can be obtained. When this three-layer woody cement board 40 is manufactured, the second semi-molded body 18 is compressed in the thickness direction by the press machine 34 without supplying the mixture 8 from the second mixture fixed quantity feeder 26. Mold it.

Here, in this embodiment, the woody raw material 4 such as wood wool and wood fragments is used as a raw material, but the woody raw material is obtained by crushing the waste unused material and the forest thinning generated when the house is demolished. If it is set to 4, it can promote destruction prevention of natural environment and resource saving, and can also aim at reduction of raw material cost.
Further, as shown in FIG. 9, the first mixer 10 and the second mixer 20 together with the wood raw material 4 and the cement paste 6 are expanded in beads, or a foamed resin obtained by crushing a foam of waste material. 42 may be mixed.

  As a specific material of the expanded resin 42 expanded in a bead shape, for example, an expandable polystyrene bead which is a bead-shaped molding material in which propane, butane, pentane, or the like is blended with a phenol resin or a polystyrene resin as a foaming agent is considered. When high-temperature steam is added to this material, the particle shape expands to a high magnification of 20 or more. Examples of other bead-shaped foamed resins include foamable high-impact polystyrene, foamed polyethylene / polystyrene copolymer resin, foamable polystyrene / acrylonitrile copolymer resin, and foamable methyl methacrylate / styrene copolymer resin.

Thus, the wood-based cement boards 38 and 40 manufactured by mixing the foamed resin 42 can further increase the heat insulating property because the foamed resin 42 has a lower thermal conductivity than air.
In addition, if ceramic that can decompose ammonia, charcoal that has a deodorizing effect, and diatomaceous earth that has a humidity-controlling effect are mixed, it becomes a more excellent building material.
Furthermore, if the incineration ash generated by the incineration of the wood-based cement board is mixed, it can be used as a material for the cement paste, so that the raw material cost can be further reduced.
Moreover, the wood-type cement board which concerns on this invention is not restricted to a thing with small bulk specific gravity, The thing with toughness is included even if bulk specific gravity is high.

Specific characteristics of the above-described wood-based cement board will be described.
The weight blending ratio of the wood raw material and the cement paste is 40% wood raw material and 60% cement paste, the thickness is 25 mm, and as shown in FIG. A wood-based cement board in which many existing layers were divided into five layers was manufactured.
As a result of performing a bending test with a trisection load on this wood-based cement board using a testing machine defined in JIS-A-1048, the bending fracture load showed a high value of 650 N or more. Further, the deflection at that time is 8 mm or less, and it has sufficient bending strength. Furthermore, the thermal resistance is 0.24 (m ² · K) / W, and it has a high heat insulating property.

It is a figure explaining the principal part of the manufacturing apparatus of the wood type cement board which concerns on this invention. It is a figure which shows the 1st shaping | molding means of the manufacturing apparatus of the wood type cement board which concerns on this invention. It is a figure which shows the structure of the 1st half molded object in one Embodiment of the manufacturing method of the wood type cement board which concerns on this invention. It is a figure which shows the structure of the 2nd half molded object in 1 embodiment of the manufacturing method of the wood type cement board which concerns on this invention. It is a figure which shows the structure of the 3rd half molded object in 1 embodiment of the manufacturing method of the wood type cement board which concerns on this invention. It is a figure which shows the curing machine of the press machine of the manufacturing apparatus of the wood type cement board which concerns on this invention, and the shape | molded compression cement board. It is sectional drawing which shows the wood type cement board of the 5 layer structure which concerns on this invention. It is sectional drawing which shows the wood type cement board of the 3 layer structure which concerns on this invention. It is a figure which shows other embodiment of the main raw material which comprises the mixture which concerns on this invention.

Explanation of symbols

2 Conveyor 4 Wood material 4a Long fiber material 4b Short fiber material 6 Cement paste 8 Mixture 10 First mixer 14 First semi-formed product 14a Lower layer mixture 14b Upper layer mixture 16 First mixture fractionator (first Molding means)
16a Cross bar 16b1, 16b2, 16b3 ... Sorting bar 18 Second semi-molded body 18a Lower layer mixture 18b Intermediate layer mixture 18c Upper layer mixture 20 Reverse layer molding machine (second molding means)
20a Rotating shaft 20b Rotating arrow 24 Second mixer 28 Second mixture fractionator 32 Third semi-formed body 32a Lower layer mixture 32b Uppermost layer mixture 32c Intermediate layer mixture 34 Press machine 36 Compression molded bodies 38, 40 Wooden cement board 42 Foam resin

Claims (7)

A mixture of wood raw material such as wood wool and wood chips and cement paste as a main raw material is formed into a plate-shaped semi-molded body, and after compression molding in the thickness direction, the semi-molded body is compressed for a predetermined time. In the method of producing wood cement board by curing,
The mixture is divided into two types: a mixture containing a large amount of long fiber wood raw material and a mixture containing a large amount of short fiber wood raw material, and the mixture containing the long fiber wood raw material is separated into a lower layer mixture. And a first molding step of molding a plate-shaped first semi-molded body in which a mixture containing the wood raw material of the short fibers is laminated as an upper layer mixture on the lower layer mixture,
The first semi-molded body is re-molded, and a mixture containing a large amount of the long fiber wood raw material is used as a lower layer mixture. A second forming step of forming a plate-like second semi-molded body, which is laminated as a layer mixture and laminated with the mixture containing a large amount of the long fiber woody material as the upper layer mixture on the intermediate layer mixture It equipped with a door,
In the second molding step, the upper part of the lower layer mixture and the upper layer mixture, which are the upper side in the thickness direction of the first semi-molded body, are agitated to contain a large amount of the long fiber woody material. A method for producing a wood-based cement board, characterized in that the lamination state of the mixture and the mixture containing a large amount of the short fiber woody material is reversed .   2. The method for producing a wood-based cement board according to claim 1, wherein in the first forming step, the mixture is classified into two kinds of mixtures by sieving according to the difference in size of the wood raw material. 3. The method for producing a wood-based cement board according to claim 1 , wherein the wood material is formed by crushing an unused material from a waste material for construction or the like, or a thinning material of a forest . As the main material, together with the wood material and cement paste, the foamed resin expanded in a bead shape and the foamed resin obtained by crushing the foam into a predetermined size are mixed to form the mixture. A method for producing a woody cement board according to any one of claims 1 to 3. The woody system according to any one of claims 1 to 4, wherein the mixture is formed by mixing incinerated ash of a wooden cement board together with the wooden raw material and cement paste as a main raw material. Cement board manufacturing method. In an apparatus for manufacturing a wood-based cement board after forming a mixture of wood raw materials such as wood wool and wood chips and cement paste as a main raw material into a plate-shaped semi-molded body,
A conveyor that conveys the molded semi-molded article, and a mixture that is arranged upstream of the conveyor and that contains the mixture containing a large amount of the long fiber wood material and the mixture containing a large amount of the short fiber wood material. Separated into two types, a mixture containing the long fiber wood raw material as a lower layer mixture, and a plate-like laminate in which the mixture containing the short fiber wood raw material is laminated on the lower layer mixture as an upper layer mixture A first molding unit that molds the first half-molded body on the conveyor, and the first half-molded body molded by the first molding unit is re-molded and contains a large amount of the long fiber woody material. The mixture is made into a lower layer mixture, a mixture containing a large amount of the short fiber wood raw material is laminated on the lower layer mixture as an intermediate layer mixture, and the long fiber wood raw material is placed on the intermediate layer mixture. A plate-like second half layered with a mixture containing a large amount as the upper layer mixture And a second shaping means for shaping the features on said conveyor,
The second forming means includes a rotating shaft that extends in a horizontal direction perpendicular to the conveying direction of the conveyor, and a number of rotating arrows that protrude radially outward from the outer periphery of the rotating shaft. The upper part of the lower layer mixture and the upper layer mixture, which are the upper side in the thickness direction of the first semi-formed product, are stirred by the rotation of the rotary arrow, and contain a large amount of the long fiber woody material. An apparatus for producing a wood-based cement board, wherein the laminated state of a mixture and a mixture containing a large amount of wood raw material of the short fibers is reversed . The first forming means includes a cross bar extending in a horizontal direction orthogonal to the conveying direction of the conveyor, and fixed in parallel at a predetermined interval in the axial direction of the cross bar, And a plurality of separation bars arranged with a downward slope as it goes to the cross bar, the cross bar reciprocates in the axial direction, and the plurality of separation bars are orthogonal to the conveying direction of the conveyor. The wood-based cement according to claim 6 , wherein a mixture containing a large amount of long-fiber wood raw material and a mixture containing a large amount of short-fiber wood raw material are screened by reciprocating. Board manufacturing equipment .

Images