JPS5927686B2 - Continuous manufacturing method for glass fiber reinforced cement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Among the reinforced cements mixed with fibers, the present invention has superior impact resistance compared to the conventionally well-known asbestos slate, and has no or very little harm to the human body. In addition, the manufacturing technology of alkali-resistant glass fiber-containing reinforced cement, which has been widely used in recent years due to its sufficient durability even in cement alkalis, is reliable and sufficient in terms of productivity and reinforcement by mixed glass fiber. In order to obtain this effect, the present applicant and others have already successfully developed a manufacturing method. Sprinkle alkali-resistant glass fiber on the surface, or
Cement slurry, which is premixed with alkali-resistant glass fibers, is poured onto a moving filter cloth in the form of a film and then supplied. Next, excess water is sucked and dehydrated from the back of the filter cloth, and the thin film-like material is wound into a roll. This invention relates to a method for continuously manufacturing reinforced cement containing glass fibers by layering, curing and curing.

In addition to fine aggregate such as sand, the cement slurry, which is the raw material for glass fiber reinforced cement manufactured by the above manufacturing method, contains thin film-like materials to prevent accidental breakage during handling before the cement hardens. It is common to disperse and mix auxiliary fibers such as pulp and asbestos as a binder for this purpose.

Among these auxiliary fibers, asbestos is harmful to the human body, and pulp not only deteriorates the water resistance of the product but also is unfavorable in terms of nonflammability and product strength. From the viewpoint of product quality, strength, etc., it is desirable to reduce the amount of these auxiliary fibers as much as possible.

On the other hand, if the mixing ratio of fine aggregate such as sand to cement is small, the shrinkage rate during cement hardening and the expansion/shrinkage rate due to drying and wetting during product use will be large, making it easy to cause defects such as cracks. It is desirable to increase the mixing ratio as much as possible.

However, as mentioned above, in terms of product quality, strength of clay, pollution control, etc., reducing the amount of auxiliary fibers and increasing the fine aggregate mixing ratio may lead to the following problems in manufacturing. Around.

In other words, when the amount of auxiliary fibers is small and the fine aggregate mixing ratio increases, not only the tensile strength of the so-called "seed", which is a membrane-like slurry containing glass fibers, decreases, but also its water retention capacity decreases. As a result, excessive water is absorbed during suction dehydration, making the seeds dry and making their transfer to the rolls uncertain. When the "seeds" are transferred to the embossing roll, they adhere too strongly to the roll surface, making it difficult to peel off from the roll, or causing unexpected damage to the product during peeling. The problem is that the range of possibilities is narrowed.

In view of the above-mentioned circumstances, the present invention provides a glass fiber that is advantageous in terms of product quality and strength, while at the same time solving the manufacturing problems that arise from the raw material combination. The object of the present invention is to provide a method for continuous production of reinforced cement.

The continuous manufacturing method of reinforced cement with glass fibers according to the present invention involves pouring and supplying cement slurry having auxiliary fibers such as asbestos or pulp of 0 to 8 times and 1 inch or less to cement in the form of a film on a moving clay. After that, alkali-resistant glass fibers are sprinkled on the top surface of the film-like slurry, or alkali-resistant glass fibers are mixed in advance, and the ratio is 0 to 8 to the cement.
A cement slurry containing auxiliary fibers such as cotton or pulp with a weight mass of less than 90% is poured onto a mobile fabric in the form of a film and supplied.

Next, surplus water is sucked and dehydrated from the back side of the fabric, and then the thin film-like material is wound around a roll, laminated, and cured to harden, thereby continuously producing glass fiber-containing reinforced cement. The adhesion enhancer is continuously sprinkled on the upper surface of the film-like cement slurry that has been poured onto the cloth and supplied, and then the entire 1wi agent is wound around the roll and the thin film-like material to be laminated is mixed with the roll. It is characterized by being sprayed in the contact area.

Therefore, the following effects are achieved.

When the cement slurry is wound onto a roll and laminated, the bond between each layer is strengthened by the adhesion enhancer sprayed on the surface of the cement slurry, but the release agent is completely prevented from separating from the roll. Therefore, it is possible to reduce the amount of auxiliary fibers mixed into the cement slurry as much as possible, increase the mixing ratio of fine aggregate, and improve the quality and strength of the product.

Embodiments of the present invention will be described below based on the drawings.

As shown in Figure 1, cement and water, fine aggregate (crushed sand) with a weight ratio of 10 to 100, and pulp and asbestos with a weight ratio of θ to 8 or less are mixed and dispersed using a mixer not shown. A fixed amount of the cement slurry A stored in the flow box IK is applied to the upper surface of the endlessly rotating belt-shaped moving fabric 2 made of felt, canvas, non-woven fabric, or a combination of these and wire mesh, in the form of a thin film, preferably 0.2 After pouring out and supplying a thin film with a constant thickness within the thickness range of 5 mm, this thin film slurry A17
) Jiroping is applied to the top m by 3 to 100 Trar with a cutter 6 consisting of a rubber roll 6a and a cutter roll 6b.
Alkali-resistant glass fibers G cut into lengths L are uniformly scattered so that the glass fiber weight ratio in the product is a certain value of 0.5 to 10, and then the scattered glass fibers G are
As clearly shown in FIGS. 2 and 4, a plurality of fin-like protrusions 13 are arranged at appropriate intervals in the direction of the rotation axis.
The film-like slurry A is mechanically pushed into the thickness of the film-like slurry A via a rotating roll 13 having a diameter of a.

Thereafter, as shown in FIG. 4, the film-like slurry A is applied to the surface of the film-like slurry A by the protrusion 13a of the push roll 13 via a roll 15 provided at a position on the downstream side of the push roll 13 in the direction of movement of the filter cloth 2. By leveling out the uneven parts as shown in Figures 2 and 5, the glass fibers G are buried in the slurry A so that nothing is exposed, and the The wall thickness is made uniform, thereby improving the compatibility between the glass fibers G and the membrane slurry A, and then, when passing over the suction box 3, excess water in the thin membrane slurry is sucked and dehydrated from the back of the filter cloth 2. After that, the thin film material B is transferred to a making roll 4 provided opposite to the filter cloth 2, and is wound up while being laminated.

After wrapping it in a laminated state to the required thickness, usually 3 to 10 layers, it is cut and rolled out into a plate, taken out on the conveyor 5, and then cut to size, pressed, and rolled. In an apparatus for continuous production of glass fiber-containing reinforced cement plate-shaped products, which is configured to be processed according to the purpose such as subsequent molding, and then cured and hardened to form a product, the cement slurry outlet 1a from the flow box 1 corresponds to As clearly shown in FIG. 3, the rotationally movable filter cloth 2 has a freely rotating roll 7 pressed against the upper surface of the filter cloth 2 that is movable relative to the outlet 1a, and a freely rotating roll 7 that is movable relative to the outlet 1a. A depression is formed by the support rotating roll 8 that is brought into contact with the lower surface of the filter cloth 2 on the lower side, and the upper side is horizontal or flat between both rolls 7.8 at both ends in the axial direction of the rolls 7.8. 10.10 so that it is positioned horizontally and seals between both sides of the filter cloth 2 in the width direction.
By providing this, a slurry reservoir 9 is formed, and at the same time, near the inlet on the suction box 3, a membrane-like cement slurry after pushing the glass fibers poured out and supplied into the soil from the filter cloth 2, that is, "seeds" is stored. on the surface of the second
As shown in the figure, the following device 11 for dispersing the adhesive force regulator is provided.

That is, a slurry containing 20 to 70 parts by weight of cement is homogeneously stirred in a tank 11A2 using a blender 11A□, and an adhesion enhancer is sprayed through a spray 11A3.
Seed” on the surface, surface area 1? ? First spraying device 11A that sprays cement components in a range of about 40 to 1000f per Z2
and non-adhesive particles such as sand and fly ash having an average particle size within the range of 44 microns to 300 microns are mixed and dispersed in a tank 11B2 using a blender 11B□ to a water VC concentration of 10 to 50% by weight in the form of a slurry. A second spraying device 11B that sprays the adhesion reducing agent, that is, a release agent in the range of about 10 to 300 grams of solid content per 1772'' of surface area, onto the surface of the "seed" via the spray 11B2. Among them, the second spraying device 11B is used to spray the making roll 4 on the surface of the thin film-like material 8 which is rolled up and laminated on the making roll 4.
The first spraying device 11A operates intermittently to spray the release agent only on the contact area with the making roll 4, that is, on the surface of the first round of rolling. In addition, in order to improve the adhesion between the laminated thin film materials B, the adhesive force increasing agent is continuously sprayed so as to be operated at all times.

Incidentally, the experimental results when the adhesion enhancer and the release agent were sprayed by both the spraying devices 11A and 11B were as follows.

(1) The raw material is a slurry with a mixing ratio of 100 parts of cement, 50 parts of silica sand, 20 parts of fly ash, and 5 parts of pulp, and the surface area of the "seed" is 1rr? Hit, cement 4
Stable operation was possible when the slurry containing 0 weight coefficient was sprayed with cement components at approximately 200 f, and stable operation was possible.
On the other hand, when slurry spraying of cement slurry was interrupted, the sheet fell off the making roll or IEJ during lamination, and operations became impossible.

(2) Using a slurry whose raw materials are 100 parts of cement, 20 parts of silica sand, and 2 parts of pulp, apply it only to the surface of the first layer of "seeds". Muratari, No. 8 silica sand (No. 82
% is within the range of 4 microns to 300 microns)
The solid content of sand water containing 30% is about 50? Stable operation was possible when molding was performed while spraying, but on the other hand, when sand and water spray was not applied with the same raw materials,
Separation of the sheet from the making roll was unstable and continuous operation was not possible.

In the apparatus described in the above embodiment, the following considerations are made as appropriate during actual operation.

(2) The thickness of the membrane slurry applied to the filter cloth 2 is adjusted as appropriate depending on the moving speed of the filter cloth 2, the slurry concentration, the internal volume of the slurry reservoir 9, and the like.

@ The method of dispersing the glass fibers G is not limited to the above method, as long as it can uniformly disperse the thin film slurry in the width direction and without directionality.

For example, glass fiber G cut into a required length in advance is stored in a hopper suspended horizontally above the filter cloth 2, and a pin roll (a roll with many pins planted on the circumference of the roll) is installed at the bottom of the hopper. ), etc., it is also possible to adopt a method of scraping off and dispersing a fixed amount.

θ In addition to using only glass fiber, some organic fibers (polypropylene, nylon, etc.) may be used in combination, or after repeating the process of draining cement slurry A and dispersing glass fiber G multiple times, pressing, leveling, Unless you deviate from the specifications of this manufacturing method, such as by performing suction dehydration, lamination, etc.
This can be implemented in various ways.

According to the above embodiment, (asbestos +
Pulp) 8% by weight or less, fine aggregate (silica sand).

It is possible to efficiently and continuously produce glass fiber reinforced cement products containing 10 to 100% by weight of fly ash, etc. and 0.5 to 10% by weight of alkali-resistant glass fibers.

In FIG. 6, alkali-resistant glass fibers are mixed in advance into the cement slurry in the flow box 1, and the mixed cement slurry A' is transferred from the flow box 1 to the cloth making 2.
to the equipment that produces the desired reinforced cement.
This shows a method to which this manufacturing method technology is applied. In this case, some of the glass fibers settle and separate in the slurry → retainer 9, but this can be picked up by moving the filter cloth 2, so there is no problem with the manufactured soil. Does not occur.

In the embodiment, a method for manufacturing a plate product made of reinforced cement containing glass fibers has been described, but it goes without saying that the method may also be applied to a method for manufacturing a cylindrical product.

[Brief explanation of the drawing]

The drawings show an embodiment of the continuous production method of reinforced cement containing glass fibers according to the present invention, and FIG. 1 is a schematic side view of the entire structure;
Figure 2 is an enlarged side view of the main part, Figure 3 is an enlarged perspective view of the main part, Figures 4 and 5 are enlarged partially cutaway front views of the main part, and Figure 6 is an enlarged front view of the main part.
The figure is an overall schematic side view showing another embodiment. A, A'...Cement slurry, B...
・Thin film material, G...Glass fiber, 2...
...Moving cloth making, 4...Additional roll, 11...
. . . Adhesive force adjusting agent dispersing device, 11A . . . Adhesive force increasing agent first dispersing device, 11B .

Claims (1)

[Claims] 1 Cement slurry A having auxiliary fibers such as cotton or pulp of 0 to 8 weight or less based on cement is transferred to cloth making 2
After pouring and supplying the film-like slurry on top, the film-like slurry A
Sprinkle alkali-resistant glass fibers G on the top surface or mix alkali-resistant glass fibers in advance, and transfer cement slurry A' having auxiliary fibers such as cotton or pulp of 0 to 8 weight or less compared to the cement. After pouring and supplying it in a film form onto the filter cloth 2, the excess water is sucked and dehydrated from the back surface of the filter cloth 2, and the thin film material B is rolled and laminated with 4 GC rolls and cured to be reinforced with glass fibers. A method for continuously producing cement, in which an adhesion enhancer is continuously sprinkled on the soil surface of the membrane cement slurry A, A' poured out onto the filter cloth 2, and then, A continuous manufacturing method for glass fiber-containing reinforced cement, in which a release agent is dispersed in a contact area of the thin film material B, which is rolled and laminated around the roll 4, with the roll 4.