JPH0138643B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for continuously manufacturing glass fiber reinforced cement boards mainly used as building materials such as interior and exterior wall materials, fireproof coatings, soundproofing materials, etc.

A conventional method of this kind is the one filed by the applicant of the present invention (Japanese Patent Laid-Open No. 57-24208).
However, in this case, the vibrator applies vibration to the bare laminate with no sheet or the like attached to the top surface, so the excess material in the laminate is applied to the top surface of the laminate. Water tends to accumulate, which causes depressions in the surface layer of the laminate, making it impossible to form a smooth finished surface and making it difficult to supply a high-quality product.

This invention eliminates the drawbacks of the above conventional ones, and
To provide a method for manufacturing a glass fiber-reinforced cement board that can reliably prevent excess water from accumulating on the upper surface of a laminate and supply a high-quality product.

The present invention will be described with reference to embodiments shown in the drawings. In Fig. 1, A is a pair of pulleys 2, front and rear;
This is a conveyor consisting of an endless belt 1 installed over a belt 2, and is configured to run at a constant speed (for example, about 1 m/min) in the direction of the arrow by an appropriate drive device (not shown). 3 is an air blower provided on the rear end of the conveyor A for blowing air onto the belt 1 to clean it; 4 is a device for spraying a release agent onto the belt 1.

Reference numeral B denotes a long glass fiber feeding device, and 5 a net-like material having a pitch of about 10 mm made of long glass fibers, and this net-like material is placed on the belt 1 by pull-out rollers 6 and 6'. This is called the a layer.

C is a short glass fiber input device, and 7 is a cart that reciprocates in the width direction of the conveyor A along a rail 8 provided above the conveyor A. A roving cutter 9 is attached to this cart so that it can be adjusted vertically. ing. Reference numeral 10 denotes a glass fiber roving, and this roving 10 is cut into short pieces with a cutter 9 and sprayed onto the layer a as short fibers 10'. This is called the b layer.

D is a device for feeding cement mortar containing ultra-fast hardening cement, which sends ordinary cement mortar mixed in a mixer 12 to a pump 13, which is adjusted to a desired discharge rate by a variable speed motor 14. Dispense a fixed amount of mortar. on the other hand,
Ultra-fast hardening cement and water are mixed in a tank 15 and sent to a metering pump 16, which adjusts the discharge amount to an arbitrary amount using an adjustment knob 17 and discharges the mixture at a fixed amount. A hardening accelerator (setter) for adjusting the hardening time of the ultra-fast hardening cement is mixed with water in a tank 18 and sent to a metering pump 19, which is adjusted to an arbitrary discharge rate with an adjustment knob 20 and discharged at a constant rate. The regular cement mortar, ultra-fast hardening cement, and setter that have been discharged in fixed amounts are mixed and stirred in a mixer 21 to produce mortar containing ultra-fast hardening cement. This mortar 22 is charged onto layer b by a charging device D provided on a cart 24 that reciprocates in the width direction of the conveyor A along a rail 23 provided above the conveyor A. A mortar injection hose 25 is attached to the above-mentioned truck so as to be adjustable in the vertical direction. A thickness adjusting device 26 is provided immediately after the mortar injection point, whereby the thickness of the mortar 22 is kept constant to form the deposited layer c. A lower vibrating body 27 is provided below the belt 1 facing the adjustment device 26, and due to its vibration, a part of the mortar 22 of the deposited layer c penetrates into the glass fiber layers B and A on the belt. This permeated mortar, layer B and layer A form the lower layer of GRC.

When the mortar 22 placed on the conveyor A is poorly hardened and soft, the hardening state can be improved by increasing the amount of ultra-fast hardening cement discharged using the adjustment knob 17 of the pump 16.
Further, when the curing start time is early, the curing time can be lengthened by increasing the discharge amount of the setter using the adjustment knob 20 of the pump 19. In this manner, manufacturing can be carried out while freely adjusting the hardening state and hardening start time of the mortar 22 using the adjustment knobs 17 and 20 of the metering pump.

On the other hand, ultra-fast hardening cement, setter, and water are mixed in the tank 15 and sent to the metering pump 16, and the pump 16 adjusts the discharge amount to an arbitrary discharge amount with the adjustment knob 17 to discharge a metered amount, and then the pump 13 discharges the metered amount. The ordinary cement mortar is mixed and stirred in the mixer 21 to form an ultra-fast hardening cement-containing mortar 22.
I can do it. The mortar 22 is loaded onto the conveyor 1 by the loading device D, and is adjusted by the adjustment knob 17 of the metering pump 16 depending on the hardening state of the mortar 22 and the hardening time. However, tank 15
The best combination of ultra-fast hardening cement and setter is determined through experiments, and the curing state and curing time are slightly adjusted using the adjustment knob 17. In this case, there is also a method of manufacturing without using the setter tank 18 and metering pump 19.

In this way, each material of ultra-fast hardening cement-containing mortar is adjusted separately and mixed together before use, which eliminates unnecessary stock. Thickness can be easily adjusted by feeding in the direction.

E is a device similar to B, and 31 is a mesh made of long glass fibers with a pitch of about 10 mm, and this mesh is placed on layer C by pull-out rollers 32, 32'. This is called the d layer. F is the same device as C, 34 is a cart that reciprocates in the width direction of the conveyor A along the rail 35 like the carts 7 and 24,
A roving cutter 36 is attached to the cart 34 so as to be adjustable in the vertical direction. 37 is a glass fiber roving, and this roving 37 is cut into short pieces with a cutter 36 to form short fibers 37'.
Sprayed in layers. This is called the e layer. G is a sheet loading device, 41 is a sheet made of non-water-absorbing resin or rubber such as vinyl, nylon, polypropylene, polyester, polystyrene, etc., and this sheet is placed on layer e by pull-out rollers 42, 42'. . The sheet 41 may be somewhat hydrophilic. In addition, in the width direction and length direction of the sheet 41, a large number of through holes 43 having a predetermined pitch and diameter are arranged over the entire width in a grid pattern (Fig. 2) or in a staggered pattern (Fig. 3). ing. The laminate having the sheet 41 adhered to its upper surface as described above is then vibrated by the upper vibrating bodies 44, 44' provided above the belt 1, causing the mortar 2 of the deposited layer c to vibrate.
A part of 2 penetrates into the upper glass fiber layers d and e,
The permeated mortar, the d layer and the e layer form an upper layer, and are bonded to the lower layer so as to sandwich an intermediate layer made of a mixture of ordinary cement mortar and ultra-fast hardening cement. Also, the upper vibrating body 4
A lower vibrating body 45 is provided on the lower side of the belt 1 facing the belts 4 and 44', and is designed to apply vibration so that the mortar 22 further penetrates into the lower and upper layers of glass fibers. Due to these vibrations, surplus water in the mortar 22 is evenly exposed on the upper surface of the sheet through the through holes 43 of the sheet 41.

Further, the vibrating body is finished by being pressurized by a finishing roller 46 so that each layer is fixed, and the vibrating body is molded to have a uniform thickness. Next, this laminate is introduced into a steam curing chamber H to evaporate excess water exposed on the sheet 41 and harden the laminate. The temperature of the steam curing chamber H at this time is 80℃
The temperature is ~100°C, and the time that the laminate conveyed by the conveyor 1 stays in the steam curing chamber H is 40 to 80 minutes. Then, this hardened laminate is separated from the belt 1 and transferred to the feed roller 4.
8,48', while the sheet 41
is wound up by a roller 49 disposed at the outlet of the curing chamber H and removed from the laminate. The laminate sent out onto the feed rollers 48, 48' is trimmed to a constant width with a length direction cutter 50 provided on the feed roller, and cut into a constant length with a width direction cutter 51 to obtain a fixed size. Glass fiber reinforced cement board (GRC board)
is obtained.

The belt 1, from which the laminated material has separated and has rotated downward, has deposits removed by a scraper 53, washed with washing water jetted from a washing device 54, and dried by dry air blown from an air blower 55. Ru.

FIG. 4 shows a comprehensive G.
This is an enlarged cross-sectional view of an RC board, which consists of three layers: an upper layer made of long and short glass fibers, an intermediate layer made of a mixture of ordinary cement mortar and ultra-fast hardening cement, and a lower layer made of long and short glass fibers. The upper and lower layers form glass fiber-reinforced layers in which the mixed mortar of the middle layer permeates through vibration.

The content of glass fiber in ordinary cement is
The content is preferably in the range of 1 to 10% by weight from the viewpoint of mechanical properties and moldability. Long glass fibers consist of woven and knitted fabrics of approximately 10
It is a mesh material with a pitch of mm, and it is tightly bonded with the mixed mortar layer and short glass fibers, greatly increasing the tensile strength and bending strength. The content of the ultra-rapid hardening cement in the mixed mortar layer is 5 to 50% by weight, preferably 10 to 40% by weight, based on the ordinary cement, from the viewpoint of fluidity and hardening properties.

In the above example, the laminate was composed of an upper layer made of long and short glass fibers, an intermediate layer made of a mixture of ordinary cement mortar and ultra-fast hardening cement, and a lower layer made of long and short glass fibers, but the present invention is not limited to this. Needless to say, the structure is not limited to the above, and may be one in which either the upper or lower layer is omitted.

The present invention is as described above, and is provided on the upper surface of a laminate formed by supplying long and short glass fibers and a mixture of ordinary cement mortar and ultra-fast hardening cement onto a running endless belt. After supplying and adhering a resin or rubber sheet with a large number of holes perforated therein, applying vibrations using a vibrating body, and removing excess water from the mixture generated by the vibrations through the holes. , because it hardens, it is possible to prevent the occurrence of dents such as blisters on the top surface of the laminate, and to form a smooth finished surface.In addition, when curing, the top surface of the laminate is covered with a sheet to prevent surface evaporation. In order to suppress the amount of water droplets, it is possible to improve curing, and since the sheet catches water droplets of steam that fall on the top surface of the laminate, it is possible to prevent holes from forming on the top surface that allow water droplets to fall. It has excellent effects such as being able to improve the accuracy of the finished surface and supplying high quality products.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing an embodiment of the invention;
FIG. 2 is a plan view of the main part of the sheet, FIG. 3 is a plan view of the main part showing a modified example of the sheet, and FIG. 4 is a sectional view of a glass fiber reinforced cement board obtained by the method of the present invention. A... Conveyor (endless belt), B, E... Long glass fiber feeding device, C, F... Short glass fiber feeding device, D... Cement mortar feeding device, G...
...Sheet loading device, H...Steam curing chamber.

Claims (1)

[Claims] 1. A large number of through holes are drilled across the entire width and length of the upper surface of the laminate formed by supplying long and short glass fibers and a mixture of ordinary cement mortar and ultra-fast hardening cement onto a running endless belt. A sheet made of resin or rubber is supplied and adhered to the sheet, and then vibrated by a vibrating body to cause surplus water of the mixture generated by this vibration to be exposed onto the sheet through the holes in the sheet. The laminate is introduced into a steam curing chamber together with the sheet with excess water exposed, the excess water is evaporated in the curing chamber, the laminate is cured, and then the sheet is removed from the cured laminate. A continuous manufacturing method for glass fiber reinforced cement boards.