JPS5839641B2 - Seiirihokiyou Cement Seikei Taino Seizou Sochi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves attaching a cement slurry mixed with fibers such as alkali-resistant glass fibers and asbestos to the surface of a papermaking net-like body in the form of a thin film, dehydrating it, and then dewatering the thin film-like material. This invention relates to a technology for producing fiber-filled reinforced cement molded bodies by curing and curing.

The manufacturing technology for so-called asbestos slate, which is cement reinforced with asbestos, has been well known as a circular mesh continuous papermaking method using a wet machine.

This circular mesh continuous papermaking method has the advantage that the thickness of the paper product can be easily changed by changing the degree of suction in the cylinder and the rotational speed of the cylinder without changing the viscosity of the slurry. This method is advantageous compared to the fourdrinier continuous papermaking method, in which it is difficult to change the thickness of the papermaking product without changing the roller speed.

As shown in Figure 4, the conventional manufacturing method of asbestos slate using this circular mesh continuous papermaking method is as shown in Figure 4. The cylinder 4, on which the net-like body 7 is stretched, is arranged so that most of the cylinder is immersed below the slurry liquid level, and the inner bottom of the cylinder 4 is provided with a predetermined drop from the liquid level to form a wastewater treatment section. The slurry is attached to the surface of the net-like body 7 by water head pressure, and excess water is drained through the net-like body 7 into the cylinder 4, and the slurry is deposited on the surface of the net-like body 7. The adhered thin film material is taken out of the vat IA as the cylinder 4 rotates, and is strongly pressed between the upper part of the outer peripheral surface of the cylinder 4 and the felt couch roll 5 located opposite thereto, so that the outer periphery of the felt couch roll 5 is removed. After transferring it to the surface of the endless felt 9 stretched over the surface and adjusting the moisture content of this thin film material to an appropriate value by the suction dehydrator 14 that acts from the back side of the endless felt 9, the amount of water facing the under roll 12 is transferred. The material is wound spirally onto a making roll 11, and when it is laminated to an appropriate thickness, it is automatically cut and transferred onto a conveyor 17 to form a laminated plate having the outer circumference of the making roll 11. After that, this laminated plate-like body is left in the flat form or is cured and hardened through a process of shaping it into a desired shape.

In recent years, by utilizing the manufacturing technology of asbestos slate and using alkali-resistant glass fibers with long fiber length as a substitute for asbestos, we have been able to create strong impact-resistant materials that far exceed the strength of asbestos slate. Attempts have been made to produce reinforced cement molded bodies containing glass fibers, but
It has not yet achieved industrial success for the following reasons.

That is, first of all, in the above-mentioned manufacturing technology, since the cylinder 4 is rotated with most of it submerged in the slurry, the long legs attached to the papermaking mesh 7 on the outer peripheral surface of the cylinder 4 are The glass fibers are aligned parallel to the rotation direction of the cylinder 4 due to the resistance of the slurry as the cylinder 4 rotates, and the glass fibers embedded in the product have a certain directionality. This results in an inconvenience in that the strength of the manufactured cement molded body is extremely different in the vertical and horizontal directions.

Second, since the fiber directionality caused by the resistance of the slurry becomes more noticeable as the circumferential speed of the cylinder 4 increases, in order to suppress the occurrence of fiber directionality as much as possible, It is essential to rotate the cylinder 4 at a low speed.

Therefore, high-efficiency manufacturing through high-speed papermaking is impossible.
In order to ensure productivity, it is necessary to operate a large number of cylinders 4 simultaneously, which not only causes large losses in terms of equipment, power, fiber-mixed slurry and drainage volume, but also causes long-legged fibers mixed in the slurry. Easy to precipitate.

Of course, such disadvantages are particularly noticeable when using glass fibers with long fiber lengths, but they also apply when producing asbestos slate.

In other words, if the asbestos fibers mixed into the cement slurry have long fibers, fiber directionality (direction of product strength) occurs, just as in the case described above, making high-speed papermaking impossible.

The present invention eliminates various inconveniences associated with such papermaking methods, and even when the fiber lengths of alkali-resistant glass fibers and asbestos mixed in cement slurry are long, and the net-like body for papermaking can be used. Even when driven at high speeds, there is almost no fiber directionality, i.e., directionality that would reduce product strength, and fiber-filled reinforced cement molding that can exhibit sufficient strength in any direction. The purpose is to propose a device that can manufacture human bodies with high efficiency.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

First, we will explain the manufacturing equipment for fiber-filled reinforced cement molded bodies. Figure 1 shows an overview of the entire equipment, and 1 is a flow box with a stirring tool 2 at the bottom. The adjusted alkali-resistant glass fiber-mixed cement slurry is fed into the flow box 1 from the supply port 1a, stirred by the stirring tool 2, and then sent to the outlet 1b side below the nozzle slice 3.

Reference numeral 4 denotes a cylinder provided at a position facing the outlet 1b of the flow box 1, and an endless belt-shaped papermaking mesh body 7 made of wire mesh or the like is hung around the cylinder 4, couch roll 10, guide roll 6, etc. It is configured to rotate along the outlet 1b as the cylinder 4 rotates.

A suction dehydrator 8 is installed in the cylinder 4 at a position facing the outlet 1b, which forces the slurry to adhere to the surface of the reticular body 7 in the form of a thin film and allows excess water to pass through the reticular body 7. It is configured to perform suction dehydration.

9 is an endless felt stretched across the felt couch roll 5 located opposite to the couch roll 10 and the under roll 12 located opposite to the making roll 11, and is a thin film-like material that is attached to the surface of the net-like body 7 and conveyed. is transferred to the surface of the endless felt 9 at the couch roll 10 portion and conveyed to the making roll 11 side.

13 is a suction dehydrator that adjusts the moisture contained in the thin film material to a value suitable for transfer to the endless felt 9; 14;
15 and 16 are nozzles for cleaning the net-like body 7 and the endless felt 9, respectively.

Reference numeral 17 denotes a conveyor that conveys the laminated plate-shaped body that is wound around the making roll 11 and automatically cut when it reaches a required thickness to a curing process or a shaping process that precedes the curing process.

As shown in FIGS. 2 and 3, the cylinder 4 is configured in a shaftless type with open sides in the axial direction,
In addition, a plurality of rollers 18...
The support frame and piping system of the suction dehydrator 8 can be inserted into the cylinder 4 from the open side in the axial direction.

A large number of openings larger than the mesh of the mesh body 7 are provided on the outer peripheral surface of the cylinder 4.

The frame body 19 that pivotally supports the group of rollers 18 is equipped with wheels 20, and the flow box 1
and rails 22 formed on the device frame 21 that supports each of the rollers.
, the cylinder 4 together with the frame 19 can be pulled out to the outside of the device when repairing or inspecting the mesh body 7 or the like.

In addition, the circumferential speed of the cylinder 4 is 20 to 80 m/m1! , the mesh of the reticular body 7 is 55 to 75 meshes, and the adhesion area corresponding to the outlet 1b of the reticular body 7 has a central angle θ of 60: to 1.
Within the range of 10°, preferably about 85°, the suction pressure of the suction dehydrator 8 is set to 100 to 250 m/m H9, and the slurry concentration is set to 15 to 50% (water to weight ratio).

According to the above configuration, a fiber-filled reinforced cement molded body is manufactured through almost the same process as the conventional wet machine for manufacturing asbestos slate mentioned above, but the suction pressure by the suction dehydrator 8 inside the cylinder 4 is The difference in pressure against the back side of the mesh body 7 is large due to the pressure of feeding the slurry to the flow box 1, and the slurry concentration is relatively high, so the slurry is stored in the flow box 1. The slurry is forcibly attached to the surface of the reticular body 7.

It is dehydrated to form a thin film-like material, and the reticular body 7
The adhesion to the surface is performed quickly and reliably, and the adhesion area on the surface of the mesh body 7 corresponding to the outlet 1b of the flow box 1 is narrow, that is, within a narrow range in the rotational direction of the cylinder 4. In contact with the stored slurry, the reticular body 7
By working together with the ability to minimize the rotational resistance caused by the accumulated slurry against the thin film-like material adhering to the surface of the reticular body 7, especially the glass fibers in the material, the glass fibers in the material This prevents them from aligning in the direction of rotational force.

Therefore, even when using glass fibers with long fiber lengths, even if the cylinder 4 is rotated at high speed to increase the paper-forming speed using the reticular body 7, the glass fibers can be randomly distributed in the thin film-like material. This makes it possible to manufacture fiber-filled reinforced cement-shaped bodies with no directionality in longitudinal or lateral strength with high efficiency.

In the above embodiments, fibers having a thickness of 1 to 50,771/m can be used.

Further, the thickness of the thin film-like material attached to the surface of the reticular body 7 can be adjusted by swinging the nozzle slice 3 using an appropriate mechanism and adjusting the gap between the tip of the nozzle slice 3 and the reticular body 7. It is.

In addition, the nozzle slice 3 is configured such that the gap between the nozzle slice 3 and the mesh body 7 facing it gradually becomes smaller as the mesh body 7 advances, so that the fiber-containing slurry in the flow box 1 smoothly flows into the network shape. A thin film of cement slurry that adheres to the body and has a uniform thickness is obtained, and clogging of the slurry in the flow box 1 is prevented.

Using the above-mentioned manufacturing apparatus, alkali-resistant glass fiber-containing reinforced cement molded bodies having the composition shown in Table 1 were manufactured, and the state of inclusion of glass fibers, strength, etc. were examined, and the following results were obtained.

(Table 1) Ordinary Portland cement 93% (weight ratio) Alkali-resistant glass fiber 5 parts Pulp 2% The alkali-resistant glass fiber is a so-called roving of long glass fibers, and about 200 filaments of 13μ are bundled. The material was cut into 25 m/m pieces and used.

The pulp used was corrugated waste paper pulp, which is used in the production of asbestos slate.

First, water and pulp are put into a pulp grinder to form an aqueous solution, and then transferred to a mixer. Into this mixer, cement and alkali-resistant glass fibers are added, and water is added to make a fiber-mixed slurry with a solid content of 40%. Adjusted to.

This raw material slurry is supplied into the flow box 1, the thickness of the thin film-like material adhering to the surface of the net-like body 7 is set to 2w〆ml, and it is cut into 3 braises on the making roll 11.
A molded body having a wall thickness of 60 mm and a length and width of 900 m/m x 1200 m/m was produced at a speed of 250 pieces/h.

After manufacturing, a close observation of the molded product revealed that the glass fibers were mixed in a two-dimensional random manner over the entire width of the molded product, and that the glass fiber rovings were hardly opened and maintained a strand shape. confirmed.

The bending strength of this molded body is shown in Table 2, and it was confirmed that the strength in the longitudinal and lateral directions was almost unchanged.

As described above, the present invention uses fiber-mixed cement slurry,
A thin film is attached to the surface of the endless mesh 7 for papermaking, which is longer than the outer circumference of the cylinder 4, which is hung on the outer circumference of the rotatable cylinder 4, and dehydrated, and then this thin film material is cured and hardened to form fibers. This is an apparatus for producing a reinforced cement molded body, in which the outlet 1b of the flow box 1 for supplying and storing the slurry is disposed in a state in opposition to a portion of the net-like body 7 that contacts the cylinder 4, and The slurry is configured to be dehydrated by creating a pressure difference between the front surface and the back surface of the slurry, and the dehydrated thin film material can be conveyed to the endless felt 9 side while being attached to the surface of the mesh body 7. At least the cylinder 4 is equipped with a suction dehydrator 8 that passes excess water through the mesh body 7 and dehydrates it by suction.
It is characterized in that it is disposed at a position facing the outlet 1b inside.

Therefore, as described in detail in the explanation of the embodiment, when attaching the fiber-containing slurry to the surface of the endless mesh body 7 for papermaking, the slurry is made highly concentrated and the mesh body 7 is moved with a large pressure difference. It is possible to quickly and reliably force the adhesion within a small range in the direction, and the surface of the reticular body 7 that contacts the slurry (width in the direction of movement) is narrowed, so that it can be attached as the reticular body 7 moves. Due to the synergistic effect of minimizing the resistance of the slurry against the thin film-like material attached to the surface of the reticular body 7, it is possible to prevent the fibers from aligning in the moving direction of the reticular body 7, and to make the fibers two-dimensional. It can be randomly mixed into the thin film material.

Therefore, fiber-filled reinforced cement molded bodies reinforced with long fibers with almost no directionality can be manufactured with high efficiency.

In addition, if a suction dehydrator 13 is provided on the back side of the endless mesh body 7, which also has the function of transporting the thin film material, the transfer to the endless felt 9 will be ensured, and it will be possible to replace the conventional asbestos slate manufacturing machine. With a simple structure that only improves the parts, fiber-filled reinforced cement molded bodies with no directionality in vertical and horizontal strength can be manufactured more efficiently through continuous operation, and equipment, power, fiber-mixed slurry, drainage volume, etc. It is possible to demonstrate excellent economic efficiency in all aspects.

[Brief explanation of the drawing]

The drawings show an embodiment of the apparatus for producing a fiber-filled reinforced cement molded body according to the present invention, in which FIG. 1 is a flow sheet, FIG. 2 is a side view, and FIG. 3 is a cross-sectional view taken along line I-1 in FIG. FIG. 4 is a flow sheet showing a conventional example. 1... Flow box, 1a... Outlet, 4... Cylinder 7... Net-like body for papermaking, 8... Suction dehydrator .

Claims (1)

[Claims] 1 After dehydrating the fiber-mixed cement slurry by attaching it in a thin film form to the surface of the endless mesh body 7 for papermaking that is longer than the outer circumference length of the cylinder 4, which is hung on the outer circumferential surface of the rotatable cylinder 4, this thin film material is This is an apparatus for producing a fiber-filled reinforced cement molded body by curing and curing the slurry, and the outlet 1b of the flow box 1 for supplying and storing the slurry is arranged in a state where it is in contact with a portion of the net-like body 7 that contacts the cylinder 4. , so that the slurry can be dehydrated by creating a pressure difference between the front and back surfaces of the reticular body 7, and the dehydrated thin film material is attached to the surface of the reticular body 7 and then endlessly At least the outlet 1b in the cylinder 4 is provided with a suction dehydrator 8 which is configured to convey water to the felt 9 side and which suction dehydrates excess water by passing it through the mesh body 7.
1. A manufacturing device for a fiber-filled reinforced cement molded article, characterized in that the device is disposed at a position facing the fiber-filled reinforced cement molded body.