JPH0811117A - Manufacture of colored cement board - Google Patents

Abstract

PURPOSE:To give vivid color to a colored cement board which is cured and set by a method wherein a colorant slurry in which a material slurry and a transparent resin emulsion are added is made to flow onto a wire cloth from a flow box, a colorant-containing material is extracted and a colored web is formed, and it is taken up by a making roll so as to make a mat body. CONSTITUTION:A material slurry and a colorant slurry are put in a material tank 11 and a colorant tank 14 and a pump 13 is operated. When a solenoid valve 16 is opened/closed at predetermined intervals, the colorant slurry is fed to a flow box 6 at the time of closing, which flows down on a wire cloth 5. The water in the colorant-containing slurry which is made to flow is sucked downward every time that it passes through a suction box 17, and dewatered. As a result, the colorant-containing material is extracted on the wire cloth and a colored web is formed, and taken up on a making roll 18. The material slurry and the colorant slurry are made to flow in alternately by the opening/ closing of the valve 16 and the color density of the web to be taken up is gradually heightened or lowered. The surface of a colored cement board can be made to be vivid by adding an emulsion.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for producing a colored cement board.

[0002]

2. Description of the Related Art The present applicant has applied for a method for producing a colored cement board with high productivity as Japanese Patent Application No. 6-43462.

In this manufacturing method, a raw material slurry and a coloring material slurry are supplied to a flow box and flowed from the flow box onto a paper making net, and the raw material mixed with the coloring material is made into a paper making net to form a colored web, Wind the colored web onto a making roll.

Next, the supply of the colorant slurry is stopped,
Only the raw material slurry is supplied to the flow box and allowed to flow on the paper making net from the flow box, the raw material is made into the paper making net to form a web, and the web is wound on a making roll.

A web wound in multiple layers on a making roll to a predetermined thickness is cut and peeled off to form a mat body having the colored web as a surface, and the mat body is molded, cured and cured to give a coloring. A colored cement board with a layer formed on the surface is obtained.

[0006]

However, in the method for producing a colored cement board as described above, since the coloring agent slurry only disperses the coloring agent in water, the colored cement board has a colored portion. It is the color of the coloring material itself and does not become vivid. It is hard to say that the design effect is high.

An object of the present invention is to solve the above conventional problems.

[0008]

Means for Solving the Problems In the method for producing a colored cement board as described above, when an emulsion of a transparent synthetic resin is added to a colorant slurry, the colored cement board becomes a bright colored portion. It is based on the discovery that

That is, according to the present invention, the raw material slurry and the coloring material slurry are supplied to a flow box and flowed from the flow box onto a paper making net, and the raw material mixed with the coloring material is made into a paper making net to form a colored web. , A colored cement board that winds a colored web on a making roll, cuts the web wound in multiple layers on a making roll to a predetermined thickness and peels it off to form a mat body, then molds the mat body and cures and hardens it. Or a raw material slurry and a colorant slurry are supplied to a flow box and flowed onto a paper making net from the flow box, and a colorant-containing raw material is made into a paper making net to form a colored web. , Winding the colored web on a making roll, stopping the supply of the coloring material slurry, supplying only the raw material slurry to the flow box, and flowing it from the flow box onto the paper making net to feed the raw material. A web is formed by drawing it up on a screen, and the web is wound on a making roll, and the web wound in multiple layers on the making roll is cut and peeled off. Body and
A method for producing a colored cement board having a colored layer formed on the surface of a mat body, which is cured and cured to obtain a colored cement board, characterized in that an emulsion of a transparent synthetic resin is added to a colorant slurry. Is a manufacturing method of.

[0010]

In the present invention, since the emulsion of the transparent synthetic resin is added to the colorant slurry, the colored portion of the obtained colored cement plate is covered with the transparent synthetic resin to obtain a bright color. It is presumed that the reason is that the colorant coated with the transparent synthetic resin is coated with a transparent film having a large refractive index and becomes wet with water, which increases gloss.

Further, in the obtained colored cement plate, the colored portion is covered with the transparent synthetic resin to improve the adhesiveness of the coating material, prevent whitening and freezing damage, and increase the strength.

[0012]

INDUSTRIAL APPLICABILITY According to the present invention, a colored cement board having a bright color and high strength can be obtained.

[0013]

EXAMPLE As shown in FIG. 1, an apparatus for carrying out the method for producing a colored cement board of the present example has front and rear drums 1, 2 and a plurality of guide rollers 3, 4 provided with an endless felt-making paper net 5. I am passing over. The rotation of the drum causes the paper making net 5 to rotate and the upper portion of the paper making net 5 to move forward.

A flow box 6 is arranged on the base end of the upper side of the paper making net 5, as shown in FIG. In the flow box 6, the raw material slurry flows in through the opening 7 at the base end, passes between the bottom plate 8 and each partition plate 9, and flows out between the bottom plate 8 and the slurry thickness adjusting plate 10 at the tip, It drops onto the base end of the upper part of the mesh 5.

As shown in FIG. 1, the raw material tank 11 is connected to the opening 7 of the flow box 6 by a supply path 12, and the supply path 1
2 has a pump 13 interposed. When the pump 13 is driven, the raw material slurry stored in the raw material tank 11 is supplied to the supply path 12
And is supplied to the flow box 6.

At the position on the downstream side of the pump 13 in the supply path 12,
As shown in FIG. 1, the coloring material tank 14 is connected by a supply passage 15, and an electromagnetic valve 16 which also serves as an on-off valve and a flow control valve is interposed in the supply passage 15. When the solenoid valve 16 is opened, the colorant slurry stored in the colorant tank 14 is supplied to the flow box 6 together with the raw material slurry. When the electromagnetic valve 16 is closed, the supply of the coloring material slurry is stopped and only the raw material slurry is supplied to the flow box 6. Also, solenoid valve 1
When the opening degree of 6 is adjusted, the supply flow rate of the coloring material slurry is adjusted, and the ratio of the coloring material slurry mixed in the raw material slurry is adjusted. Although not shown, a control circuit for opening and closing the solenoid valve 16 at a set interval is provided.

Below the upper part of the paper making net 5, as shown in FIG. 1, a plurality of suction boxes 17 are arranged at predetermined intervals. The suction box 17 sucks the water of the raw material slurry on the upper side of the paper making net 5 downward through the paper making net 5.

On the tip of the upper side of the paper making net 5, as shown in FIG. 1, there is provided a making roll 18 for winding the web made into the paper making net 5. When the web is wound in multiple layers on the making roll 18 to a predetermined thickness,
When the web is wound in multiple layers, the loop is cut and peeled off.

Below the front side of the making roll 18, as shown in FIG. 1, there is provided a conveyor 19 for transferring the mat body of the multi-layered web separated from the making roll 18 and developed to the front side. As shown in FIG. 1, a flat plate press 20 into which the mat body transferred by the conveyor 19 is inserted is provided in front of the conveyor 19. The flat plate press 20 is detachably attached to the upper surface plate which moves up and down.

The composition of the raw material is cement 30 to 50%, silica sand 30 to 50%, pulp 2 to 10%, and other 2 to 10%. The ratio of cement to silica sand is 1: 1.5 to 1.
5: 1. The raw material slurry is prepared by dispersing the above raw materials in water to a concentration of 5 to 15%.

The composition of the colorant slurry is 4 parts colorant 100 parts water 1 part transparent synthetic resin aqueous emulsion 1 part. Examples of the coloring material include pigments such as carbon black, red iron oxide, and chrome yellow (yellow lead). Examples of the aqueous emulsion of transparent synthetic resin include ethylene vinyl acetate copolymer emulsion, acrylic styrene resin emulsion and acrylic resin emulsion.

The ratio of the raw material slurry to the colorant slurry supplied to the flow box 6 is 100: 2 to 100: 5.
Is.

When manufacturing a colored cement board, the above raw material slurry and colorant slurry are put into the raw material tank 11 and the colorant tank 14, respectively, and the manufacturing apparatus is operated. Then, the pump 13 is driven and the solenoid valve 16 opens and closes at a set interval.

When the solenoid valve 16 is opened, the raw material slurry and the colorant slurry are supplied to the flow box 6 to be mixed, and flow down from the tip of the flow box 6 onto the upper part of the paper making net 5.

The raw material slurry mixed with the coloring material flowed on the upper part of the paper making net 5 which is moving, the water passes through the upper part of the paper making net 5 and naturally falls, while passing through the upper position of each suction box 17. Each time, water is sucked downward through the upper side of the paper making net 5 and dehydrated. As a result, the coloring material-mixed raw material is made into a thin film on the upper side of the paper making net 5 to form a colored web. The colored web is wound from the upper part of the moving web 5 onto a rotating making roll 18.

2 to 2 of the colored web on the making roll 18
The electromagnetic valve 16 is closed every time the raw material slurry and the coloring material slurry required to be wound into four layers are supplied to the flow box 6.

Then, the supply of the coloring material slurry is stopped and only the raw material slurry is supplied to the flow box 6. In the raw material slurry flowing out from the flow box 6, the mixing ratio of the coloring material is gradually reduced, the mixing of the coloring material is stopped, and the raw material slurry in which the coloring material is not mixed is the paper net 5
Run down to the top. Therefore, the coloring density of the web that is drawn up to the upper side of the moving paper making net 5 gradually decreases, and coloring is lost. In addition, the coloring density of the web wound around the rotating making roll 18 gradually decreases, and the coloring disappears.

The electromagnetic valve 16 is opened each time the raw material slurry is supplied to the flow box 6 in an amount necessary for winding the light-colored web or the uncolored web onto the making roll 18 in 7 to 8 layers.

Then, the supply of the coloring material slurry is restarted and the raw material slurry is mixed with the coloring material slurry in the flow box 6. In the raw material slurry that flows down from the flow box 6 to the upper side of the paper making net 5, the mixing ratio of the coloring material gradually increases and becomes the same ratio as the previous time. Therefore, the coloring density of both the web drawn up on the upper side of the paper making net 5 and the web wound around the making roll 18 gradually increases to the same density as the previous time.

Each time the color density of the web wound on the making roll 18 increases, that is, each time the web is wound in multiple layers on the making roll 18 to a predetermined thickness.
The cutting device of the making roll 18 is operated to cut the multi-layered web and separate it from the making roll 18, spread it on a mat body having the colored web on the inner peripheral side as a surface and drop it on the conveyor 19. .

The mat body with the colored web on the surface facing upward is inserted into the flat plate press 20 by the conveyor 19 in operation and placed on the lower surface plate of the flat plate press 20. Then
The upper surface plate of the flat plate press 20 descends, and the mat body is press-molded by the template fixed to the upper surface plate of the flat plate press 20 to form a colored cement plate, and the surface of the colored cement plate is uneven. The pattern is embossed.

The colored cement board is cured through primary curing and secondary curing, dried and coated to form a flat roofing material.

As shown in FIG. 2, the colored cement board has 1 to 3 colored layers 31 on the front side and 1 to 2 colored layers on the back side.
The colored layers 32 of the two layers are respectively arranged, and both colored layers 31, 3
5 to 6 non-colored layers 33 are arranged between the two, 1 to 2 light color layers 34 are respectively arranged between the non-colored layers 33 and the respective colored layers 31 and 32, and an uneven pattern 35 is formed on the surface. It is embossed.

Colored layer 31 on the front side and colored layer 32 on the back side
Are coated with the transparent synthetic resin added to the colorant slurry, respectively, and become bright colors. In addition, the adhesion of the paint is improved, and white sinter and frost damage are prevented, and the strength is increased.
Further, asbestos is not mixed in the raw material, but the raw material cement, pulp and the like and the colorant are uniformly dispersed. It is presumed that the reason is that the aqueous dispersion of the transparent synthetic resin added to the colorant slurry improves the dispersion of the raw materials and the colorant in the slurry.

Since the intermediate layers 33 and 34 are either the non-colored layer 33 or the light-colored layer 34 and a large amount of coloring material is not mixed, the coloring material is not wasted and the papermaking property is deteriorated due to the mixing of the coloring material. None or very few.

<Modification> 1) In the embodiment, the colored layer 32 is arranged on the back side of the colored cement plate, but a light-colored layer or a non-colored layer is arranged.

2) In the embodiment, the uncolored layer 33 and the light color layer 34 are arranged in the intermediate layer of the colored cement board, but only the light color layer or the light color layer and the color layer are arranged.

3) In the embodiment, the coloring material is not mixed in the raw material slurry put in the raw material tank 11, but 0.5 to
Incorporate a small amount of coloring material such as 1%.

4) In the embodiment, the uneven pattern 35 is embossed on the surface of the colored cement board, but the uneven pattern is not embossed.

[Brief description of drawings]

FIG. 1 is a schematic view of an apparatus for carrying out a method for manufacturing a colored cement board according to an embodiment of the present invention.

FIG. 2 is an enlarged schematic cross-sectional view of a colored cement board manufactured by the manufacturing method of the same example.

[Explanation of symbols]

 5 Paper net 6 Flow box 18 Making roll 31 Coloring layer on the surface side

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Claims (2)

[Claims] 1. A raw material slurry and a coloring material slurry are supplied to a flow box and flowed from a flow box onto a paper making net, and a raw material mixed with a coloring material is made into a paper making net to form a colored web. It is wound on a making roll, cut into multiple layers on a making roll and cut to a predetermined thickness to form a mat body, which is then cured and cured. The method for producing a colored cement board is characterized in that an emulsion of a transparent synthetic resin is added to the colorant slurry. 2. A raw material slurry and a coloring material slurry are supplied to a flow box and flowed onto a paper making net from the flow box, and the coloring material mixed raw material is made into a paper making net to form a colored web. Winding it up on a making roll, stopping the supply of the colorant slurry, supplying only the raw material slurry to the flow box and letting it flow from the flow box onto the paper making net, making the raw material into the paper making net to form a web. The web is wound on a making roll, and the web wound in multiple layers on a making roll is cut and peeled off to form a mat with the colored web as the surface, and the mat is molded and cured. A method for producing a colored cement plate having a colored layer formed on the surface thereof by curing, wherein a transparent synthetic resin emulsion is added to a colorant slurry. Manufacturing method.