JPS61270118A - 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 J The present invention relates to
! The present invention relates to a method for manufacturing architectural boards in which strength is increased by orienting fibers in manufacturing boards using a so-called semi-dry process.

[Background Art] Conventionally, there is a manufacturing method called a semi-dry method in which building boards containing hydraulic cement, fibers, aggregates, etc. are manufactured using a small amount of mixed water. In this method, (1) the mixture of cement and Va fibers added with water becomes so-called lumps or lumps, and uniform dispersion is impaired, and (1) when this cement mixture is molded, the fibers are randomly dispersed. Therefore, due to the above two points, (C) the produced architectural boards had a defect in that they were inferior in terms of strength.

[Objective of the Invention J The present invention has been developed in view of the above points, and it is an object of the present invention to provide a manufacturing method for a construction board whose strength is improved by orienting fibers in a semi-dry process. The purpose is to

[Disclosure of the Invention] That is, the method for manufacturing a construction board of the present invention includes dropping a cement mixture 1, which is a mixture of hydraulic cement, reinforcing fibers, and water, from a dispersion machine 2 while dispersing it in a dispersion P112. At the same time, air is blown from one side to this falling cement mixture 1, and then this cement mixture 1 is
The cement mixture 1, in which hydraulic cement and fibers are mixed at a predetermined hot water ratio, is loosened by a disperser 2, and then air is blown to orient the fibers during molding. The purpose has been achieved.

The present invention will be described in detail below.1 Materials for the construction board according to the present invention include reinforcing fibers such as bulbs, polypropylene, organic fibers such as wood chips, paper scraps, and wool, or inorganic fibers such as asbestos, rock wool, and glass fibers. Hydraulic cement such as Portland cement, blast furnace cement, fly ash cement, silica cement, etc., and filler such as lightweight aggregate such as fly ash, silica balloon, perlite, silica flour, silica hume, etc. are dispersed and mixed using an appropriate mixer. can be used. Here, the best mixer to be used can be selected depending on the material used. 6 Next, water equivalent to 10 to 50% by weight of the mixed water ratio is added to the dry dispersed material during mixing. . This cement mixture 1
is in an uneven state with many so-called lumps and lumps.

In this way, the cement mixture 1 to which a predetermined amount of water has been added is uniformly dispersed using a dispersing device A as shown in FIG.

To explain the outline of this dispersing device A, scraping conveyors 4.4 are respectively disposed above the first conveyor 3 on the feed direction side and on the upper side, and the scraping conveyors 4.4 are disposed above the first conveyor 3. The cement mixture 1 is scraped up by a scraping conveyor 4, and a predetermined amount of the cement mixture 1 is sent to the next process so that a predetermined amount is stocked on the first conveyor 3. Further, a phototube 5 is disposed above the first conveyor 3, and the phototube 5 detects the amount of cement mixture 1 supplied to the scraping conveyor 4.
By driving the , a certain amount is sent to the next process. A beater roll 6 is arranged on the feeding direction side of the first conveyor 3.

A plurality of protrusions 7 are provided on the outer peripheral surface of the beater roll 6, and the fed cement mixture 1 is finely knocked down by the beater roll 6 downward. A first dispersing machine 12 called a 7r is disposed below the beater roll 6. This dispersion W12
As shown in FIGS. 2 and 3, a pair of dispersion vanes 10 formed by attaching a plurality of rotary vanes 9 to a rotary shaft 8 are formed facing each other, and both dispersion vanes 10 are as shown in FIG. It rotates inward as shown by arrow B. A plurality of blade pieces 11 are protruded from each rotary blade 9, and the blade pieces 11 of the other dispersion blade 10 are inserted between the blade pieces t i, ii dark slits of one dispersion blade 10. Cement mixture 1 once removed in this first dispersion 8!112
is then dropped onto the second conveyor 13 and transported to the second conveyor 1.
3 will be stocked again on top. A comb roll 14 and a reversing roll 15 are arranged on the second conveyor 13,
The amount of the cement mixture 1 on the second conveyor 13 is controlled by the phototube 16 disposed above the second conveyor 13 in the same manner as described above. Then, a predetermined amount of this loosened cement mixture 1 is scraped off with a comb roll 14 and sent out, and then beaten off again with a beater roll 17 to form the above-mentioned dispersion 81.
A second disperser 2 called 7-futsu 7-ar has the same configuration as 12.
This dispersion W12 is set such that the rotation speed of the opposing dispersion blades 10 is different, and by providing a rotation difference between the pair of opposing dispersion blades 10, a stripping effect is produced. In addition, because the rotation speeds of both dispersion blades 10 and 10 are different, cement mixture 1 with a dispersion of 8!2
will be blown away by the dispersing blade 10 with a high circumferential speed. That is, in this embodiment, the rotation speed of the dispersion blade 10a on the left side in FIG. 1 is set higher than the rotation speed of the dispersion blade 10b on the right side, so that the cement mixture 1 is blown to the right. . This second distribution 4112
Below the id plate 18 on the right side and the mounting plate 19 on the left side.
is arranged, and the blown cement mixture 1 hits the side plate 18. Also, mounting plate 1
9 is provided with a plurality of air outlets 20 to accelerate the blowing of the cement mixture 1, and
Makes the flow even. By doing this, the fibers in the cement mixture 1 are lined up in the flow direction and are oriented.1 Next, this cement mixture 1 is filled into a mat shape in a coal plate or a formwork 21 as shown in the figure. Next, the formwork 21 is conveyed by a third conveyor 22, and then the cement mixture 1 is compressed by a press to form a plate to a predetermined thickness. Next, this mat material is cured to produce a construction board. A curing operation for curing cement can be performed by a commonly used method.

The rotational speed of the dispersion blade 10 of the dispersion Wi2 is 300 to 500 rpm on the low speed side (250 to 400 m/t in circumferential speed).
It is preferable to set the speed to about 000 to 1000 rpa+ (500 to 800 m/win in circumferential speed) on the high-speed side, but there is no particular limitation and it is sufficient to make a difference in the circumferential speed. However, at low speeds, the loosening effect becomes smaller. In addition, the structure of the disperser 2 is, for example, as shown in FIG. 4, in which each rotary blade 9 is attached to the rotary shaft 8 with the angle shifted (for example, here, A-D is shifted by 15 degrees).
It is preferable to make the dispersion blades 10 face each other so that the material is loosened from the gap 00 between the rotary shaft 8 and the tip of the rotary blade 9 and the gap C0 between the blade pieces 11 of the rotary blade 9. It falls. In this case, the above-mentioned clearance C, , C is suitably about 1 to 5 mm.

Thus, the cement mixture 1, which is a mixture of hydraulic cement, reinforcing fibers, lightweight aggregate, and water, is dispersed W1.
By blowing air from one side onto the falling cement mixture 1 while dispersing it in step 2, the fibers in the cement mixture 1, which are particularly easy to be blown away by the wind, are aligned and oriented in the direction of air blowing. Therefore, the architectural board obtained by molding this fiber-oriented mat has good fiber orientation, little variation in density, and high strength.

Furthermore, by providing a peripheral speed difference between the pair of dispersion blades 12° 12 that constitute the disperser 2, it is possible to increase the loosening effect of the cement mixture 1 and disperse it uniformly. By making the generated wind and the air blown from the air outlet 20 in the same direction, the orientation of the fibers can be improved.

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

Mixing example> Ordinary Portland cement 33% by weight fly ash 10% by weight silica hume
15% by weight lightweight aggregate 35% by weight organic fiber 7% by weight (bulb,
Use vinylon, polypropylene, etc. ) Add and mix 20 to 40 parts by weight of water (water mixing ratio 20 to 40) to 100 parts by weight of the above mixture, loosen this cement mixture with a dispersion machine, and drop it onto the conveyor while dispersing it and simultaneously release air. was blown outward from the side, and then the cement mixture filled in the formwork was pressed to make a mat, which was then cured to obtain a construction board.

E19 An m-collection plate was obtained in the same manner as in the above Example except that air was not blown.

Next, the bending strength and tensile strength of the obtained architectural boards Table 1 From the results shown in Table 1, the strength of the building boards obtained in the examples was improved compared to the comparative examples in both bending strength and tensile strength. This was confirmed.

[Effects of the Invention] As described above, the present invention allows a cement mixture in which hydraulic cement, reinforcing fibers, and water are mixed to be dispersed by a dispersing machine, and simultaneously falls from the dispersing machine and at the same time Air was blown onto the cement mixture from one side and then the cement mixture was molded.The air blowing orientated the fibers in the cement mixture, creating a building board with excellent strength. It is possible to manufacture two things.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a manufacturing apparatus according to an embodiment of the present invention;
The figure is a side view of the same dispersing machine as above, FIG. 3 is a plan view of same as above, and FIG. 4 is a side view of the same dispersing blade as above. 1 is a cement mixture, and 2 is a disperser. Agent Patent attorney Ishi 1) Ai Seven procedural amendments (voluntary) July 5, 1985

Claims (1)

[Claims] (1) A cement mixture in which hydraulic cement, reinforcing fibers, and water are mixed is dispersed by a dispersion machine and dropped from the dispersion machine, and at the same time, air is blown onto the falling cement mixture from one side. , followed by forming this cement mixture.