JPS6213884B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for continuously manufacturing a glass fiber reinforced cement board having a generally inverted U-shaped cross section, which is particularly used for building materials such as interior and exterior wall materials.

Conventionally, this type of glass fiber reinforced cement board (GRC board) with a roughly U-shaped cross section has been manufactured using the batch method, in which a formwork with a roughly inverted U-shaped cross section is used.
This was done by pouring GRC materials.

However, the batch method described above has disadvantages in that it takes a long time to work, has low productivity, and is difficult to continuously produce high-quality products.

This invention solves the above-mentioned conventional drawbacks, allows GRC plates with a generally inverted U-shaped cross section to be manufactured continuously in a short period of time, increases productivity, and provides high-quality products. The purpose of the present invention is to provide a continuous manufacturing method for glyph-shaped GRC plates.

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 in the direction of the arrow by an appropriate drive device (not shown).
As shown in FIG. 4, the endless belt 1 has grooves 3, 3' formed on both sides along the longitudinal direction of its surface, and rising portions 3a on both sides of the belt outside the grooves 3, 3'. , 3a' are formed in the recessed grooves 3, 3', and support plates 5, 5' whose rear ends are fixed to the fixed frame 4 are attached to the surface of the belt, excluding the front edge, as will be described later. It is fitted flush and loosely. Reference numeral 6 denotes an air blower for blowing air onto the belt 1 provided on the rear end of the conveyor A to clean it.

Reference numeral B designates a sheet loading device, and 7 designates a sheet made of paper, resin, glass cloth, cloth, etc., and this sheet is placed on the belt 1 and support plates 5 and 5' by pull-out rollers 8 and 8'. This is called the a layer.

Reference numeral C denotes a long glass fiber feeding device, and 10 a net-like material having a pitch of about 10 mm made of long glass fibers. This is called the b layer.

D is short glass fiber input device, 13 is conveyor A
This is a truck that reciprocates in the width direction of the conveyor A along a rail 14 provided above, and a roving cutter 15 is attached to this truck so as to be adjustable in the vertical direction. Reference numeral 16 denotes a glass fiber roving, and this roving 16 is cut into short pieces by a cutter 15 and sprayed onto the b layer as short fibers 16'. This is called the c layer.

E is a device for feeding cement mortar containing ultra-fast hardening cement, which feeds ordinary cement mortar mixed in a mixer 21 to a pump 22, and the mortar pump 22 adjusts the discharge amount to a desired amount with a variable speed motor 23 to feed the mortar. Dispense in a fixed amount. On the other hand, ultra-fast hardening cement and water are mixed in the tank 24 and sent to the metering pump 25, which adjusts the discharge amount to an arbitrary discharge amount using the adjustment knob 26 and discharges the cement at a constant rate. A hardening accelerator (setter) for adjusting the hardening time of the ultra-fast hardening cement is mixed with water in a tank 27 and sent to a metering pump 28, and the pump 28 is adjusted to an arbitrary discharge rate with an adjustment knob 29 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 30 to produce mortar containing ultra-fast hardening cement. This mortar 31 is charged onto layer c by a charging device E provided on a cart 33 that reciprocates in the width direction of the conveyor A along a rail 32 provided above the conveyor A. A mortar injection hose 34 is attached to the above-mentioned truck so as to be adjustable in the vertical direction. A thickness adjusting device 35 is provided immediately after the mortar injection point, whereby the thickness of the mortar 31 is kept constant to form the deposited layer d. A lower vibrator 36 is provided below the belt 1 facing the adjustment device 35, and its vibration causes the mortar 31 to penetrate into the glass fiber layers B and C on the belt. Form the bottom layer of GRC.

When the mortar 31 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 26 of the pump 25.
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 29 of the pump 28. In this way, manufacturing can be carried out while freely adjusting the hardening state and hardening start time of the mortar 31 using the adjusting knobs 26 and 29 of the metering pump.

On the other hand, ultra-fast hardening cement, setter, and water are mixed in the tank 24 and sent to the metering pump 25. The pump 25 adjusts the discharge amount to an arbitrary discharge amount with the adjustment knob 26 to discharge a metered amount, and the pump 22 discharges the metered amount. Mortar 31 containing ultra-fast hardening cement is mixed and stirred with ordinary cement mortar in mixer 30.
I can do it. The mortar 31 is loaded onto the conveyor 1 by the loading device E, and is adjusted by the adjustment knob 26 of the metering pump 25 depending on the hardening state of the mortar 31 and the hardening time. However, tank 24
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 26. In this case, there is also a method of manufacturing without using the setter tank 27 and metering pump 28.

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.

F is the same device as C, and 38 is a mesh made of long glass fibers with a pitch of about 10 mm, which is placed on layer d by pull-out rollers 39, 39'. This is called the e layer.

G is the same device as D, 40 is trolley 13, 33
Similarly, the carriage 40 reciprocates along the rail 41 in the width direction of the conveyor A, and a roving cutter 42 is attached to the carriage 40 so as to be adjustable in the vertical direction. Reference numeral 43 denotes a glass fiber roving, and this roving 43 is cut into short pieces by a cutter 42 and sprayed onto layer e as short fibers 43'. This is called the f layer. The laminate stacked as described above is then moved to an upper vibrating body 4 provided above the belt 1.
The mortar 31 penetrates into the glass fiber layers e and f on the upper surface by the vibrations of 6 and 46', and the e and f layers form an upper layer, and a mixture of ordinary cement mortar and ultra-fast hardening cement is formed between the lower layer and the lower layer. Adhesive sandwiching the intermediate layer consisting of the following. Further, a lower vibrating body 47 is provided on the lower side of the belt 1 facing the upper vibrating bodies 46, 46', and vibrates so that the mortar 31 further penetrates into the lower and upper layers of glass fibers. It's summery. The top surface of the upper layer is further finished by a finishing plate 49 which is supported by a fixed beam 48 and can freely rotate and move up and down, forming a flat laminate of the desired thickness as shown in FIG. .

H is a laminate forming device, and as shown in FIGS. 2 and 3, this device has the grooves 3, 3',
The support plates 5, 5' are loosely fitted into the support plates 5, 5', and tapered portions 51, 51' are formed at the front end edges of the support plates 5, 5' to be inclined downward. When forming, the flat laminate that is guided by the rising parts 3a, 3a' on the belt 1 and the support plates 5, 5' is directed as it is to the position where the tapered parts 51, 51' are formed. This allows the laminate to move along the tapered portions 51, 51' on both sides of the laminate into the grooves 3, 51'.
While contacting the inner surface of 3', it gradually falls into the grooves 3 and 3' due to its own weight, and as shown in Figures 3 and 5, it sag slightly inward at point A and fold as shown in Figure A. Bend. And this bending is the taper part 51,
51', and when it finishes descending the tapered parts 51, 51', it is further bent outward through the bottom corners of the concave grooves 3, 3', and at point B, it becomes larger. As shown in the figure, the entire body is formed into an inverted U-shaped cross section. During the above-mentioned molding, the laminate has tapered portions 51, 51' on the surface of the intermediate portion.
Finishing rollers 52 disposed in between and close to the belt surface form a tapered portion 5 on both sides of the surface.
Finishing rollers 53, 5 disposed within the downstream grooves 3, 3' of the grooves 1, 51' and close to the bottom surface of the grooves.
3' further provides finishing rollers 54, 54' whose outer surfaces on both sides are disposed close to the inner surface of the groove.
Surface finishing is performed in sequence.

Next, this laminate is introduced into a steam curing chamber and cured, and the cured laminate is sent out onto the feed rollers 57, 57' while separating from the belt 1.
A GRC plate of a fixed size is obtained by cutting to a constant width with a length direction cutter 58 provided on the feed roller and cutting to a constant length with a width direction cutter 59.

The belt 1, from which the laminated material has separated and rotated downward, has deposits removed by a scraper 60, washed with washing water jetted from a washing device 61, and dried by dry air blown from an air blower 62. Ru.

FIG. 7 shows a cross section of a substantially inverted U-shaped structure manufactured according to the present invention.
This is an enlarged sectional view of a G, R, C board (cable track) in the shape of a letter, showing 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. It consists of three layers, of which the upper and lower layers form a glass fiber reinforced layer into 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.

It goes without saying that the flanges at both ends of the manufactured GRC board were cut off before the final product was completed, and the sheet 7 laid under the lower layer was peeled off. Figures 8 to 10 show various forms of GRC obtained by slightly changing the design of the molding device H.
Both plates are shown in an inverted state immediately after manufacture.

FIG. 6 shows another embodiment of the support plate, and this support plate 5
5 and 55' are protrusions 5 on the rising parts 3a and 3a' side of the belt 1 and having approximately the same height as the rising parts 3a and 3a'.
6,56' are provided. The support plate 5
By using 5,55', the cross section is approximately inverted U-shaped.
The height of both side walls of the GRC board can be formed to any desired height.

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. In the above embodiment, finishing rollers 52, 53, 53' and 54,
Although the circumferential surface of 54' is formed as a flat surface, it goes without saying that the circumferential surface may be formed as an uneven surface and the outer surface of the GRC board may be finished with an appropriate uneven pattern.

This invention is as described above, in which grooves are formed on both sides along the longitudinal direction of the surface, and a fixing member is loosely fitted onto the running endless belt with its surface substantially flush with the groove. A laminate is formed by supplying long and short fibers and a mixture of ordinary cement mortar and ultra-fast hardening cement, and this laminate is formed in a downward slope on the front edge of the fixing member located at the front in the running direction of the belt. When passing through the taper, both sides are bent downward to form an approximately inverted U-shaped cross section, and then harden, allowing glass fiber reinforced cement boards with an approximately inverted U-shaped cross section to be formed continuously in a short period of time. can be manufactured and its productivity can be increased. Further, because of continuous manufacturing, it has excellent effects such as being able to provide a high quality product without variations in material layer thickness.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an embodiment of the invention;
FIG. 2 is a plan view showing the molding device, FIG. 3 is a sectional view taken along the line of FIG. 2, FIG. 4 is a sectional view taken along the line of FIG. 2, and FIGS. 6th
The figure is a cross-sectional view corresponding to FIG. 4 showing another embodiment of the support plate, and FIG. 7 is a cross-sectional view of a glass fiber reinforced cement board having an inverted U-shaped cross section obtained by the method of the present invention. 8 to 10 are cross-sectional views showing various modifications of FIG. 7. A...Conveyor (endless belt), B...Sheet input device, C, F...Glass fiber input device,
D, G... Short glass fiber feeding device, E... Cement mortar feeding device, H... Molding device, I... Curing room.

Claims (1)

[Claims] 1 Concave grooves are formed on both sides along the longitudinal direction of the surface, and a fixing member is loosely fitted into the concave grooves with its surface almost flush with the running endless belt. Glass long and short fibers, ordinary cement mortar and ultra-fast hardening A cement mixture is supplied to form a loosely laminated material, and when this laminated material is passed through a taper formed at a downward slope on the front edge of the fixing member located at the front in the running direction of the belt, After forming the cross section into a roughly inverted U shape by bending both sides downward,
A continuous manufacturing method for a glass fiber reinforced cement board having an approximately inverted U-shaped cross section, characterized by hardening.