JPS6120707A - Manufacture of building board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field] The present invention relates to a method for manufacturing architectural boards such as roofing materials.

[Background Art] In general, when a building board A made of asbestos cement is used as a roofing material B as shown in FIG. It was prone to cracking when walking. For this reason, it is conceivable to cover this portion C with a reinforcing plate to prevent cracking, but this not only requires special members but also requires time and effort to construct. Therefore, conventionally,
The asbestos-cement slurry is scooped up by a papermaking cylinder, and this asbestos-cement slurry is transferred to a felt conveyor to form a single-layer wet mat. Next, polypropylene fibers, polyacrylonitrile fibers, etc. are applied to the entire surface of the single-layer wet mat as reinforcing fibers. Architectural boards were manufactured by sprinkling reinforcing fiber cement slurry containing . In addition to using slurry, the adhesion between the fibers and cement in reinforced fiber cement soft free is worse than asbestos and cement, resulting in a layer with a lower specific gravity than asbestos-cement slurry, and the interlayer adhesion is also poor. However, there was a problem in that the reinforcing effect was small unless the press pressure was increased and sufficient compression was performed.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to improve the construction material by making it possible to selectively reinforce the parts of the construction board that need reinforcement and to suppress warping. The purpose is to enable reinforcement of the board as a whole.

[Disclosure of the Invention] The method for manufacturing a construction board of the present invention includes scooping up an asbestos-cement slurry 2 using a papermaking cylinder 1, transferring the asbestos-cement slurry 2 to a felt conveyor 3, and forming a single-layer wet mat 4. ``Form the following.

Then, reinforcing fiber cement slurry 6 is spread on the single-layer wet mat 4 at locations corresponding to the reinforced portions, and then rolled up on a making roll 7 to form a green sheet 8. Next, the green sheet 8 is drained and passed through a metal plate 14. At the same time, a plurality of wire meshes 15 are interposed between the green sheet 8 and the water draining metal plate 14 at a predetermined distance from each other at a location corresponding to the reinforcing portion, and in this state, the green sheet is pressed to dewater. It is characterized by curing, and with this configuration, the above object can be achieved. The present invention will be explained below based on the accompanying drawings. Reference numeral 1 denotes a papermaking cylinder, which is partially immersed in asbestos-cement slurry 2 in a slurry tank 9 and rotates to form a green board 10 on the outer periphery, and this green board 10 is transferred to a felt conveyor 3 to form a single layer wet. A mat 4 is formed. Asbestos cement slurry 2 is asbestos 7~
15 parts by weight, 5 to 15 parts by weight of filler such as silica fine particles, 1 to 2 parts by weight of papermaking aids such as valves, cement 7 such as blast furnace cement, Boltland cement, 7 Fire Ash, etc.
It is formed by mixing 2.5 to 3.5 times the amount of mixed water with respect to the solid content corresponding to the substrate formulation consisting of 0 to 85 parts by weight. Reinforcing fiber cement slurry 2 is spread on the single layer wet mat 4 on the felt conveyor 3. Even if the reinforcing fiber cement slurry 2 is applied to the entire surface of the single-layer wet mat 4 as shown by diagonal lines in FIG. 6 (FIG. 6(a))
, or it may be a surface that includes the part to be reinforced (
(b)) of the same figure may also be used. The reinforcing fiber cement slurry 2 contains 1 to 5 parts by weight of reinforcing fibers such as polypropylene fibers, polyacrylonitrile fibers, vinylon fibers, carbon fibers, etc. with a diameter of 1 to 5 d and a fiber length of 3 to 8 IIlio, and 4 to 1 parts by weight of asbestos.
0 parts by weight or pulverized waste material of asbestos cement products 30-60
1.5 to 2.2 times the amount of water mixed with the solid content of 180 to 210 parts by weight of cement as described above, and coloring materials such as pigments and carbon paste as needed. This is what I got. The amount of spraying of this reinforcing fiber cement slurry 2 is 0.45 to 0.8 kHz/solid content.
It is m2. After this, N required for making roll 7
The green sheet 8 is formed by winding up (four layers in the illustrated example) and cutting out. Next, as shown in FIG. 2, a plurality of wire meshes 15 are placed between the green sheet 8 and the water draining metal plate 14 at predetermined intervals at locations corresponding to the reinforcing portions as shown by diagonal lines in FIG. A drainage felt 16 is placed on the wire mesh 15 alternately and pressed to remove water. The wire mesh 15 has a thickness of 1/4 to 1/4 of the thickness of the green sheet 8 after pressing.
It is preferable to have a thickness of about 1/6 and 6 to 10 meshes. If the wire mesh 15 is placed over the entire surface of the reinforced portion as shown in FIG. 8, there is a risk of deformation during curing due to non-uniform thickness, and the effect of suppressing warping will be small. After the press is the 4th
As shown in the figure and FIG. 5, the press pressure is sufficiently controlled in the area where the wire mesh 15 is interposed, forming a recess 17, improving glabella adhesion and specific gravity, and reducing warping due to the irregular cross-sectional shape caused by the recess 17. As a result, the reinforcing effect is significantly improved. Thereafter, the board A is obtained by first curing it under heat and then curing it by leaving it in the air. This architectural board is cut into desired dimensions and shapes and used as roofing material.

Next, the present invention will be explained in detail based on examples.

Note that the present invention is not limited to the following examples.

In the following, % indicates lllt%.

(Example 1) Asbestos (5 and 6 class mix) 13%, B class blast furnace cement 7
6% No. 8 silica, 10% No. 8 silica, and 1% pulp (used newspaper).
d. Reinforced fiber cement with 1.5% vinylon of fiber length 61, 7% asbestos (mixed class 5 and 6), 92% B type Ryoro cement and slurry concentration of 32%? ')-0.8 in terms of solid content
kg/m2 (see Figure 6). Next, this single-layer wet mat 4 was wound up on a making roll to form a green sheet consisting of four layers. Thereafter, this green sheet is placed on a drainage metal plate, and a plurality of wire meshes each having a thickness of 1.211 Im and 8 meshes are interposed between the green sheet and the drainage metal plate in the manner shown in FIG. 7(a). Let's do it, 8
Pressed at a pressure of 0 kHz/am2 for a holding time of 1.5 seconds, heat cured at 60°C and 90% RH for 10 hours as second curing, and left in air for 7 days as second curing to a thickness of 5. 6
A construction board of 5a+m was obtained. 500ffil of this
The n-span bending fracture load, warping, and glabellar peel strength were measured. The results are shown in Table 1.

(Example 2) The reinforcing fiber cement slurry was spread over the entire surface of a single-layer wet mat, and the thickness was 5.5 mm in the same manner as in Example 1, except that a wire mesh was interposed as shown in FIG. 7(b). 65a+m
Architectural boards were obtained. The 500,111 beat span bending failure load, warpage and glabellar peel strength of this product were measured. The results are shown in Table 1.

(Comparative Example 1) A construction board with a thickness of 5.65 mm was obtained in the same manner as in Example 2, except that the reinforcing fiber slurry was spread over the entire surface of the single-layer wet mat, and the wire mesh was not interposed. 500 of this stuff
InI11 span bending failure load, warpage and glabellar peel strength were measured. The results are shown in Table 1.

(Comparative Example 2) A 5.65+++m thick mat was prepared in the same manner as in Example 2, except that the reinforcing fiber slurry was spread over the entire surface of the single-layer wet mat, and a wire mesh was interposed over the entire reinforcing part as shown in Figure 10. Obtained construction boards. The 50011111 span bending fracture load, warpage, and glabellar peel strength of this product were measured. The results are shown in Table 1.

Table 1 Measurement method Bending fracture load... As shown in Figure 8, the sample 11 is placed between 5=5001 spans with the paper making direction facing the direction of the arrow, and a load is applied from above to determine the fracture load. It was measured. .

Warping: As shown in Fig. 9, 22 kg Asu7 Altorfing was laid on the concrete panel, and nine roofing material specimens 11, which were made by cutting construction boards to a specified size, were nailed onto the concrete panel. After applying an acrylic styrene emulsion paint to a film thickness of 20 to 40 μm, it was heated from a height of 50 CI 11 with an infrared lamp 12 at a surface temperature of 70° C. for 3 hours to observe warpage and reaction.

Glabella peeling strength...20X20I as shown in Figure 10
Measurements were taken by attaching both ends of sample 11 of I1m to jig 18 via epoxy adhesive and pulling in the direction of the arrow.

From Table 1, it can be seen that the glabellar peeling strength and bending fracture strength of the examples of the present invention are higher than those of the comparative examples (
Moreover, it can be seen that the warpage is small and the reinforcing effect is significantly improved.

[Effects of the Invention] In the present invention, reinforcing fiber cement slurry is spread on a single layer wet mat, then rolled up on a making roll to form a green sheet, and then the green sheet is placed on a draining metal plate. At the same time, a plurality of wire meshes are interposed at predetermined intervals between the green sheet and the water-draining metal plate at locations corresponding to the reinforcing portions, so when pressing the green sheet to dewater, the wire mesh can be inserted. Sufficient press pressure is applied to the pressed portions, which form concave portions, improving glabella adhesion and specific gravity, and reducing warpage due to the irregular cross-sectional shape of the four portions, resulting in a significant improvement in reinforcing effect.

[Brief explanation of drawings]

Fig. 1 is a partially omitted schematic diagram showing an apparatus for carrying out an embodiment of the present invention, Fig. 2 is a sectional view showing a green sheet obtained by the above, and Fig. 3 shows a pressing process that can be applied to the same. 4 is a sectional view showing the green sheet after pressing, FIG. 5 is an enlarged view of the X section in FIG. 4, and FIG. 6(a) (
b) is a plan view showing the state of distribution of reinforcing fiber cement free; Fig. 7 (a) and (b) are plan views showing the arrangement of wire mesh in the same manner as above; and Fig. 8 is a plan view showing the method of measuring bending fracture 1 strength. □ Figure 9 (a) and (b) are plan views and side views showing the method for measuring warpage, Figure 10 is a side view showing the method for measuring glabellar peeling strength, and Figure 11 is a diagram showing the arrangement of the wire mesh. FIG. 12 is a plan view showing a comparative example, and FIG. 12 is a plan view showing a state in which architectural boards are used as roofing materials, in which 1 is a papermaking cylinder, 2 is an asbestos-cement slurry, 3 is a felt conveyor, and 4 is a single layer. Wet mat, 5 is a brush roll, 6 is reinforced fiber cement slurry, 7 is a making roll, 8 is a green sheet, 14 is a draining metal plate, and 15 is a wire mesh. Agent Patent Attorney Ishi 1) Chief 7114Figure 6ll915iIf Figure 10 (
b) Figure 11 Figure 12 Procedural amendment (voluntary) August 20, 1980 To the Commissioner of the Japan Patent Office Telephone 1, Indication of the case 1988 Patent Application No. 142'? 02 No. 2, Name of the invention Method for manufacturing architectural boards 3, Relationship with the case of the person making the amendment Patent applicant Address 1048 Bold Kadoma, Kadoma City, Osaka Name (583)
) Matsushita Electric Works Co., Ltd. Representative Iku Kobayashi 4, Agent 5, Date of amendment order Voluntary correction application number Patent Application No. 142902/1982, the scope of claims in the specification is corrected as follows. (1) Scoop up the asbestos-cement slurry with a paper-making sill, transfer this asbestos-cement slurry to a felt conveyor to form a single-layer wet mat, then spread reinforcing fiber cement slurry on the single-layer wet mat, and A green sheet is wound up on a rear making roll, and then the green sheet is placed on the draining outer panel, and a plurality of wire meshes are placed between the green sheet and the draining outer panel at a location corresponding to the reinforcing portion. 2. A method for manufacturing a construction board, which comprises interposing them at intervals, pressing and dehydrating them in that state, and then curing them." 2. Line 19 of page 3 of the above to line 20 of the same page, Page 3, line 20 to page 4, line 1, page 5, line 17, 1
Page 0, line 17, page 10, line 18, and page 12, line 5
We have corrected the words "water draining metal plate" in lines 6 to 6 of the same page to "water draining iron plate". 3. We have corrected the words "drain metal plate" in line 10 of page 7 of the same rIS, and from lines 10 to 11 of page 7 to "iron plate for drainage." Agent Patent Attorney Ishi 1) Chief Seven Procedures Amendment (Method) February 15, 1985;

Claims (1)

[Claims] (1) Scoop up asbestos-cement slurry with a papermaking cylinder, transfer this asbestos-cement slurry to a felt conveyor to form a single-layer wet mat, and then sprinkle reinforcing fiber cement slurry on the single-layer wet mat,
After this, a green sheet is wound up on a making roll, and then the green sheet is placed on a water-draining metal plate, and a plurality of wire meshes are placed between the green sheet and the water-draining metal plate at locations corresponding to the reinforcing parts. 1. A method for producing a construction board, which comprises interposing the boards at intervals of 1,000 yen, pressing and dehydrating in that state, and then curing.