JPH07251412A - Method and device for manufacture of color cement plate - Google Patents

Abstract

PURPOSE:To make a manufacture easy and simplify a device by making a material slurry and a colorant slurry flow down to a wire cloth so as to form a color web and a colorless web, taking them up on a making roll, and molding with a press a mat body obtained by cutting the webs. CONSTITUTION:When a color cement plate is to be manufactured, a pump 13 is driven first and a solenoid valve 16 is opened. A material slurry and a colorant slurry in tanks 11 and 14 are respectively supplied to a flow box 6 and mixed. Thereafter, it is made to flow down to a wire cloth 5. That is, the water in the mixed slurry is sucked downward through the wire cloth 5 and the colorant-containing material is scooped up in the wire cloth 5 so as to form a color web. Next, only the material slurry is made to flow down to the wire cloth 5 so as to form a colorless web. Succeedingly, the color web and the colorless web are respectively taken up on a making roll 18 in multilayer. Thereafter, these are cut and peeled so as to form a mat body having the color web as a surface. Thereafter, the mat body is molded by a press 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a colored cement board having a colored layer formed on its surface, particularly a colored cement board suitable for a roofing material.

[0002]

2. Description of the Related Art In the case of producing an inorganic plate such as a calcium silicate plate, a magnesium carbonate plate or an asbestos cement plate having a colored layer formed on the surface thereof, as disclosed in JP-A-55-75978, In the check-type papermaking machine, first, the first raw material tank in which the raw material slurry mixed with the coloring material is placed is moved upward so that the liquid surface of the raw material slurry mixed with the coloring material in the first raw material tank is It comes into contact with the endless felt that is in contact with the lower part, sucks the water of the coloring material mixed raw material slurry through the felt into the first round net type cylinder, and draws the coloring material mixed raw material into the felt to form a colored web. Take up the colored web on a making roll.

Next, while descending the first raw material tank, the second raw material tank containing the raw material slurry containing no colorant is raised to raise the liquid level of the raw material slurry in the second raw material tank to the second level. Contact the endless felt that abuts the bottom of the cylinder cylinder,
Water of the raw material slurry not mixed with the coloring material is sucked into the second cylinder cylinder through the felt, and the raw material is made into a felt to form an uncolored web, and the uncolored web is wound on a making roll. .

When the web is wound in multiple layers on a making roll to have a predetermined thickness, the web wound in multiple layers is cut and peeled off to obtain a raw mat plate having a colored web as a surface. The raw plate is cured, cured, dried, and the colored surface is made up with makeup.

[0005]

However, in the case of producing a colored inorganic plate as described above, the raw material mixed with the coloring material has a poor water-repellency, but the water of the raw material slurry mixed with the coloring material is used. Suction upward against the gravity. Therefore, since the raw material slurry mixed with the coloring material is difficult to dehydrate, it is difficult to make paper and the productivity is poor.

Further, since the raw material slurry containing the coloring material and the raw material slurry containing no coloring material are used properly,
Since the raw material tank containing the raw material slurry is moved up and down, the apparatus becomes large-scale.

Further, when adjusting the coloring density, the first
Since the raw material slurry containing the coloring material in the raw material tank is replaced, it takes a lot of trouble.

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

[0009]

The method for producing a colored cement board of the present invention is to supply a raw material slurry and a coloring material slurry to a flow box, and then to flow down from the flow box onto an endless paper making net to mix the coloring material. Water of the raw material slurry is sucked downward through a paper making net, the raw material mixed with the coloring material is made into a paper making net to form a colored web, and the colored web is wound on a making roll, and then the coloring material slurry. Supply of the raw material slurry to the flow box, and then draining it from the flow box to the endless paper making net, the water of the raw material slurry is sucked through the paper making net, and the raw material is made into the paper making net. The web is wound up to form a web, and the web is wound up on a making roll.When the web is wound in multiple layers on the making roll to a predetermined thickness, the web wound in multiple layers is cut and peeled off to form a colored web. The face and the mat body, and molding the mat body in press, curing and cured to obtain a colored cement plate formed on the surface of the colored layer.

Further, when the mat body is molded by pressing, an uneven pattern is embossed on the surface of the mat body by the template.

In the apparatus for producing a colored cement plate of the present invention, a flow box and a suction box are arranged on the upper side and the lower side of an endless paper making net, and the raw material slurry is poured from the flow box onto the paper making net. Water of the raw material slurry is configured to be sucked into the suction box through the paper making net, a making roll for winding the web made into the paper making net is provided, and the raw material tank and the coloring material tank are respectively connected to the flow box, The raw material slurry and the coloring material slurry are supplied to the flow box, and means for stopping the supply from the coloring material tank to the flow box is provided so that only the raw material slurry can be supplied to the flow box.

Further, means for adjusting the flow rate of the colorant supplied from the colorant tank to the flow box is provided so that the ratio of the colorant slurry mixed in the raw material slurry can be adjusted.

[0013]

In the method for producing a colored cement board of the present invention, the raw material slurry having poor water-solubility mixed with the coloring material is sucked upward against the gravity because the water is sucked downward in the direction of gravity. Compared to conventional technology, it is easier to dehydrate,
Easy to make paper.

Further, when embossing an uneven pattern on the surface of the mat body, since the template is pressed against the surface of the mat body by a press, unlike the case of scratching the surface of the mat body with an embossing roll, even if deeply embossed, It is difficult for an intermediate layer different from the surface coloring layer to appear on the colored surface of the mat body.

In the apparatus for producing a colored cement board of the present invention, means for stopping the supply from the colorant tank to the flow box in order to use the raw material slurry mixed with the colorant and the raw material slurry not mixed with the colorant, For example, an on-off valve is provided, and unlike the prior art, there is no need to provide a device for raising and lowering the raw material tank containing the raw material slurry, so the device does not become large-scale.

Further, in order to adjust the color density, a means for adjusting the flow rate of the colorant from the colorant tank to the flow box, for example, a flow rate control valve is provided. In comparison, it does not take much effort.

[0017]

According to the method for producing a colored cement board of the present invention, papermaking is easy and the productivity is good.

Further, in the mat body, even if the uneven surface is deeply embossed with an uneven pattern, an intermediate layer different from the surface coloring layer does not easily appear on the colored surface, and the deep uneven pattern is formed neatly on the colored cement plate.

In the apparatus for producing a colored cement plate of the present invention, since the raw material slurry mixed with the coloring material and the raw material slurry not mixed with the coloring material are used properly, the size of the apparatus is not large and the structure is simplified.

Further, the adjustment of the coloring density is easy and does not require much labor.

[0021]

EXAMPLE As shown in FIG. 1, an apparatus for producing a colored cement board of the present example, an endless felt-making paper net 5 is stretched over front and rear drums 1 and 2 and a plurality of guide rollers 3 and 4 to make paper. The mesh 5 is rotated to move the upper part of the mesh 5 forward.

On the base end of the upper part of the paper making net 5 is shown in FIG.
The flow box 6 is arranged as shown in FIG. In the flow box 6, the raw material slurry flows in from the opening 7 of the base plate, passes between the bottom plate 8 and each partition plate 9, and flows out from between the bottom plate 8 and the slurry thickness adjusting plate 10 at the tip. Mesh 5
It is configured to drop onto the base end of the upper part of the.

As shown in FIG. 1, a raw material tank 11 is connected to an 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 a position downstream 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, and when the solenoid valve 16 is closed, the supply of the colorant slurry is stopped and only the raw material slurry is supplied. Are supplied to the flow box 6. In addition, the solenoid valve 16
When the opening degree of is opened, 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.

A plurality of suction boxes 17 are arranged below the upper side of the paper making net 5 at predetermined intervals, as shown in FIG. The suction box 17 is configured to suck 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 part of the paper making net 5 is shown in FIG.
As shown in FIG. 4, a making roll 18 for winding the web made up on the paper making net 5 is provided, and when the web is wound on the making roll 18 in multiple layers to a predetermined thickness, the web wound in multiple layers is removed. The ring is cut and peeled.

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 materials 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 usually 1: 1.
It can be changed within the range of 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%. Optimal concentration is 9-10
%.

The colorant slurry is prepared by dispersing a pigment such as carbon black or red iron oxide as a colorant in water to obtain 5 to 10%.
To the concentration of.

In the colorant-mixed raw material slurry in the flow box 6 to which the raw material slurry and the colorant slurry are supplied, the ratio of the colorant is 7% or less. If it exceeds 7%, the paper-making property deteriorates. 1 to 4% is preferable.

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 and 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 colorant, which has been cast down on the upper part of the paper making net 5 in motion, 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 around a rotating making roll 18 from the upper side of the paper making net 5 moving in the forward direction.

The colored web is 2 to 2 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 flow box 6 is supplied with an amount of the raw material slurry required for winding the thin colored web or the uncolored web around the making roll 18 into 7 to 8 layers.

Then, the supply of the coloring material slurry is restarted, and the coloring material slurry is mixed with the raw 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 subjected to primary curing and secondary curing, and then cured, dried and coated to form a flat roof 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 thin colored layers 34 are respectively arranged between the non-colored layer 33 and each of the colored layers 31 and 32, and an uneven pattern 35 is formed on the surface. Is embossed.

Since the intermediate layers 33 and 34 are either the non-colored layer 33 or the thin 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. There are no or very few.

<Modification> 1) In the embodiment, the feed system by the pump 13 is used to supply the raw material slurry to the flow box 6, but the gravity dropping system by its own weight is used.

2) In the embodiment, the embossed pattern 35 is embossed on the surface of the colored cement plate, but the embossed pattern is not embossed.

3) In the embodiment, the colored layer 32 is arranged on the back side of the colored cement board, but a thin colored layer or a non-colored layer is arranged.

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

5) In the embodiment, the supply valve 15 of the coloring material tank 14 is provided with the solenoid valve 16 which also functions as an on-off valve and a flow rate control valve, but the electromagnetic on-off valve and the flow rate control valve are separately provided.

[Brief description of drawings]

FIG. 1 is a schematic view of an apparatus for producing 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 apparatus of the same example.

[Explanation of symbols]

 5 Paper making machine 6 Flow box 11 Raw material tank 14 Coloring material tank 16 Solenoid valve that doubles as an on-off valve and a flow control valve 17 Suction box 18 Making roll 20 Press 31 Surface-side colored layer 35 Uneven pattern

Claims (4)

[Claims] 1. A raw material slurry and a coloring material slurry are supplied to a flow box, flowed down from the flow box onto an endless paper making net, and water of the coloring material mixed raw material slurry is sucked downward through the paper making net. The raw material mixed with the coloring material is made into a paper making net to form a colored web, and the colored web is wound on a making roll, and then the supply of the coloring material slurry is stopped and only the raw material slurry is supplied to the flow box. Then, it is poured from the flow box onto an endless paper making net, the water of the raw material slurry is sucked through the paper making net, the raw material is made into a paper making net to form a web, and the web is wound on a making roll. When the web is wound in multiple layers on a making roll to a predetermined thickness, the web wound in multiple layers is cut and peeled off to form a mat body with the colored web as the surface, and the mat body is molded by a press, A method for producing a colored cement board, which comprises curing and curing to obtain a colored cement board having a colored layer formed on the surface thereof. 2. The method for producing a colored cement board according to claim 1, wherein when the mat body is formed by pressing, an uneven pattern is embossed on the surface of the mat body with a template. Production method. 3. A flow box and a suction box are arranged on the upper side and the lower side of the endless paper making net, and the raw material slurry is poured from the flow box onto the paper making net to make the raw material slurry water into the paper making net. It is configured to suck into the suction box through, a making roll that winds the web that has been made is wound around the paper making net, and the raw material tank and the coloring material tank are connected to the flow box,
A colored cement characterized in that the raw material slurry and the coloring material slurry are supplied to the flow box, and means for stopping the supply from the coloring material tank to the flow box is provided so that only the raw material slurry can be supplied to the flow box. Plate manufacturing equipment. 4. The apparatus for manufacturing a colored cement board according to claim 3, wherein a means for adjusting a supply flow rate from the coloring material tank to the flow box is provided to adjust a ratio of the coloring material slurry mixed in the raw material slurry. An apparatus for producing a colored cement board, characterized by being