JPH05200715A - Production of inorganic cement panel - Google Patents

Abstract

PURPOSE:To prevent the generation of a freeze damage in a part provided with grooves by a method wherein a dry molding material is sprinkled over the surface of a mat formed from a slurry by a papermaking method to be pressed and the surface of the part where the dry cement molding material is partially sprinkled of the formed mat is subjected to cutting processing to provide grooves before curing and hardening the mat. CONSTITUTION:The dry cement material 2 sprinkled over the surface of a mat formed by a papermaking method is compressed and the formed mat 1 is passed under a cutting roller 28 to subject the mat 1 to cutting processing. The cutting roller 28 is formed by providing cutting edges 29 to the outer periphery thereof. Grooves 3 such as joint grooves 3a or shiplap grooves 3b are formed by performing cutting at the place where the dry-type molding material 2 is partially supplied and the dry-type cement molding material 2 is also present on the bottoms of the grooves 3 and it can be prevented that the formed mat is exposed to the bottoms of the grooves 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an inorganic cement board used as a building board such as an outer wall material.

[0002]

2. Description of the Related Art As a method of manufacturing a cement-based building board mainly composed of hydraulic cement, there are roughly classified a wet method and a dry method. The wet method is a method of manufacturing by making a slurry containing hydraulic cement and water as the main components, and the dry method is a method of manufacturing wood chips such as sensmet boards and wood wool cement boards. The addition amount of 50
This is a method of manufacturing by using a cement dry-molding material whose main component is a hydraulic cement having a low water content, which is prepared in a small amount of not more than 10% by weight.

The biggest difference between the wet method and the dry method is the amount of added water. That is, the wet method uses a slurry prepared by dispersing hydraulic cement in a large amount of water, whereas the dry method uses a cement dry molding material prepared by mixing a small amount of water with hydraulic cement. is there. Although the wet method and the dry method have advantages and disadvantages, the dry method is superior in frost damage resistance to the wet method because it can form a dense structure. Therefore, a building board having high frost damage resistance is obtained by laminating a surface layer formed by a dry method on the surface of a substrate formed by a wet method to manufacture a building board.

That is, as shown in FIG. 5 (a), the surface of a papermaking mat 1 prepared by papermaking a slurry containing hydraulic cement and water as the main components contains hydraulic cement with a low water content as the main components. By spraying the cement dry molding material 2, pressing it, and then curing and curing it,
As shown in FIG. 5B, it is possible to manufacture a building board in which a dense surface layer 7 is laminated by a dry method on the surface of a substrate 6 by a wet method.

[0005]

However, when manufacturing a building board in which a dense surface layer 7 is laminated on the surface of a substrate 6, the surface is cut to form joint grooves 3a and groove for interlocking 3b. When the groove 3 is provided, there is a problem that the substrate 6 by the wet method is exposed at the bottom of the groove 3 and water may enter the substrate 6 from the groove 3 portion to cause frost damage.

The present invention has been made in view of the above points, and an object of the present invention is to provide a method for producing an inorganic cement-based board capable of preventing frost damage from occurring in a grooved portion. Is.

[0007]

The method for producing an inorganic cement-based board according to the present invention comprises forming a papermaking mat 1 by papermaking a slurry containing hydraulic cement and water as main components, and the surface of the papermaking mat 1 Is partially supplied with a dry cement molding material 2 whose main component is a hydraulic cement, and the partially supplied dry cement molding material 2 is pressed and pushed into the paper mat 1, 1. Spray the dry cement molding material 2 evenly over the entire surface of 1.
Next, the papermaking mat 1 is pressed, and then the papermaking mat 1 is pressed.
The surface of the portion where the dry cement molding material 2 is partially sprayed is cut to form a groove 3 and then cured and cured.

[0008]

Operation: The surface of the papermaking mat 1 is partially sprayed with the dry cement molding material 2 mainly composed of hydraulic cement having a low water content, and this partially sprayed dry cement molding material 2 is sprayed.
After pressing and pushing it into the papermaking mat 1, the dry cement molding material 2 is evenly distributed over the entire surface of the papermaking mat 1.
And then the papermaking mat 1 is pressed, and after that, the surface of the portion of the papermaking mat 1 on which the dry cement molding material 2 has been partially sprayed is cut to form the grooves 3. The dry cement molding material 2 is pushed into the papermaking mat 1 at the portion where 3 is cut, and the dry cement molding material 2 also exists at the groove bottom of the groove 3 and the papermaking at the bottom of the groove 3 is performed. It is possible to prevent the mat 1 from being exposed.

[0009]

EXAMPLES The present invention will be described in detail below with reference to examples. The slurry is prepared by dispersing hydraulic cement in water, and mainly contains cement and water. This slurry is made into a paper by using a paper making machine such as a round net paper making machine, a fourdrinier paper making machine, a Harschek paper making machine, and a paper making mat 1 is prepared. The papermaking mat 1 is formed as a long continuous product, and the papermaking mat 1 thus formed and containing about 50 to 150% by weight of water is placed on a conveyor belt 8 and conveyed to each step.

First, the papermaking mat 1 is passed under the press roller 9 as shown in FIG.
As shown in FIG. 1A, the grooved protrusions 10 provided on the outer circumference of the papermaking mat 1 are provided with concave grooves 11 on the surface (upper surface) of the papermaking mat 1. The recessed groove portion 11 is formed at a place where the groove 3 is provided by cutting, which will be described later, and may be formed shallower than the groove 3. Next, the dry cement molding material 2 is applied to the surface of the papermaking mat 1 in each of the concave groove portions 11 as shown in FIG.
Supply as in (b). This dry cement molding material 2
Is prepared by using the dry material mixing device 12 of FIG. 3 to be described later, and the supply device 13 is provided with a nozzle opening at the bottom at a position corresponding to each groove 11.
Can be supplied by dropping from. In this way, after the dry cement molding material 2 is sprayed to the groove 11 of the papermaking mat 1 so as to rise, it is passed under the pressing roller 14 of the papermaking mat 1 and the surface of the papermaking mat 1 is pressed by the pressing roller 14 The dry cement molding material 2 that has risen up is pushed into the papermaking mat 1 as shown in FIG.

After that, the dry cement molding material 2 is uniformly sprayed on the entire surface of the papermaking mat 1. FIG. 3 shows a dry material mixing device 12 for preparing the dry cement molding material 2 and a spraying device 15 for spraying the dry cement molding material 2. The dry material mixing device 12 includes a dry mixer 17 and a constant quantity feeder 18. It is formed by a wet mixer 19 and a material feeder 20, and the spraying device 15 is formed by a width direction distributor 21 and a vibrating feeder 22.
Then, first, hydraulic cement to which fibers, lightweight aggregates, etc. have been added is mixed by the dry mixer 17. This dry mixer 1
As 7, an Erich mixer, a high speed mixer or the like is used. The materials dry-mixed by the dry mixer 17 are quantitatively supplied to the wet mixer 19 by the constant quantity feeder 18, and water is added in the moisture mixer 19. The water added here ranges from 0 to 50% by weight of the material. The dry cement molding material 2 thus prepared by adding a predetermined amount of water is supplied from the material supply device 20 to the width direction distributor 21, and further supplied to the vibrating feeder 22 in a state of being substantially evenly distributed in the width direction. To be done. Then, from the vibrating feeder 22 to the entire surface of the papermaking mat 1 in the width direction, as shown in FIG.
As in (d), the dry cement molding material 2 can be sprayed uniformly. At this time, if the dry cement molding material 2 is liable to be tampered with due to the large amount of fibers and the like,
It is preferable that the loosening machine 23 is passed through if necessary. Further, after the dry cement molding material 2 is made uniform by the leveling machine 24, the surface of the dry cement molding material 2 is pressed by the pressing roll 25. Press roll 25
Is to perform preliminary pressing in order to prevent the dry cement molding material 2 from scattering during pressing in the next step.

After the dry cement molding material 2 is uniformly sprayed on the surface of the paper-making mat 1 as described above, the paper-making mat 1 is cut into a predetermined size by a hydraulic cutting device (not shown). As shown in the drawing, the press machine 26 presses the papermaking mat 1 up and down, and as shown in FIG. 1 (e), the dry cement molding material 2 is spread over the surface of the papermaking mat 1.
To compress. After this, as shown in FIG. 2B, the surface is cut by passing the papermaking mat 1 under the cutting roller 28. The cutting roller 28 is formed by providing a cutting blade 29 on the outer periphery thereof, and the cutting roller 28 is cut at a portion where the dry cement molding material 2 is partially supplied to form a joint groove as shown in FIG. 1 (f). The groove 3 such as the groove 3a and the phase adjusting groove 3b is formed. Since the groove 3 is provided by cutting at the portion where the dry cement molding material 2 is partially supplied, the dry cement molding material 2 also exists at the bottom of the groove 3 and the papermaking process is performed on the bottom of the groove 3. It is possible to prevent the mat 1 from being exposed.

Thereafter, this is cured and cured to obtain an inorganic cement-based board used as a building board in which the surface layer 7 made of the dry cement material 2 is laminated on the surface of the substrate 6 made of the papermaking mat 1. It is a thing. In this case, since the surface layer 7 is a dense layer formed by a dry method, it is possible to prevent ingress of water and obtain high frost resistance, and the bottom of the groove 3 can be prevented. In addition, since the dry cement molding material 2 is present and the substrate 6 is not exposed, water does not enter the substrate 6 through the groove 3 and frost damage does not occur.

[0014]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, a dry cement molding material containing a hydraulic cement partially having a low water content as a main component is supplied to the surface of a papermaking mat, and the partially supplied dry cement molding is supplied. After pressing the material into the papermaking mat, spread the dry cement molding material evenly over the entire surface of the papermaking mat, then press the papermaking mat and then partially spray the dry cement molding material of the papermaking mat. Since the surface of the cut part was cut to form a groove, the dry cement molding material was pushed into the papermaking mat at the part where the groove was cut, and this dry cement was also present at the bottom of the groove. It is possible to prevent the papermaking mat from being exposed at the bottom of the groove due to the presence of the molding material, and to prevent frost damage resistance from decreasing due to the infiltration of water from the groove part. Is shall.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, in which (a) to (f) are sectional views of respective process parts.

FIG. 2 shows a part of the above, (a), (b)
[Fig. 3] is a perspective view of each process part.

FIG. 3 is a cross-sectional view of a spraying step of the dry cement molding material of the above.

FIG. 4 is a perspective view showing a spraying step and a pressing step of the dry cement molding material of the same.

FIG. 5 shows a conventional example, and (a) and (b) are cross-sectional views of respective process parts.

[Explanation of symbols]

 1 Papermaking mat 2 Dry cement molding material 3 Groove

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B32B 13/00 7365-4F E04C 2/04 C 7904-2E

Claims (1)

[Claims] 1. A dry-cement molding mainly comprising a hydraulic cement having a low water content partially on the surface of the paper mat, by making a paper mat from a hydraulic cement and a slurry containing water as a main component. After the material is supplied and the partially supplied dry cement molding material is pressed and pushed into the papermaking mat, the dry cement molding material is evenly spread over the entire surface of the papermaking mat, and then the papermaking mat is pressed. A method for producing an inorganic cement-based board, characterized in that after this, the surface of the part of the papermaking mat on which the above-mentioned dry cement molding material has been partially dispersed is cut to form a groove, and then cured and cured.