JPS586604B2 - Manufacturing method of fiber reinforced board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a fiber reinforced board for construction.

A typical example of a fiber-reinforced board for construction is an asbestos fiber-reinforced cement board.

As one of the manufacturing methods of this asbestos fiber reinforced cement board,
A so-called dry method is known, and FIG. 1 shows an outline of this dry method.

In FIG. 1, 1' is a belt conveyor.

2' is a water tank, and belt conveyor 1 is running in the A' direction.
The belt surface of ' is wetted by dripping water from water tank 2'.

3' is a flannel box in which asbestos fiber mixed cement raw material Si is dropped and deposited in air suspension on the belt surface of the running belt conveyor 1'.

4' is a leveling roll, in which the deposited raw material is layered S2'
be accustomed to

5' is a water tank, and this water tank 5' is added to the raw material layer S2'.
drip water is supplied from.

6' is a pressure roll, and the above-mentioned water-containing raw material layer 83' is formed to a predetermined thickness.

7' is a roll cutter, and the molded body 84' is cut into a predetermined length by this roll cutter 7'.

8' is an auxiliary belt conveyor whose running speed is higher than that of the belt conveyor 1'.

Therefore, when the cut pieces S' of the molded body 84', that is, the raw original plates, are transferred to the auxiliary belt conveyor 8', the gap between the raw original plates is widened.

The raw sheets S', S', etc. thus transferred by the auxiliary belt conveyor 8' are manually taken out from the side of the belt conveyor 8' by the operator. The original board is cured.

In the above, when the worker manually takes out the raw original sheets S' and S' from the auxiliary belt conveyor, the raw original sheet S' is forcibly stopped from running on the auxiliary belt conveyor 8', and this raw original sheet S' The back surface of the raw original sheet is rubbed by the surface of the auxiliary belt and is taken out to the outside of the double auxiliary belt conveyor 8'.

Therefore, when the raw original sheet is taken out, the raw original sheet is subjected to a force in the running direction of the auxiliary belt conveyor.

However, since the asbestos cement raw plate described above is in a soft state when taken out due to the slow curing speed of the cement, the raw raw plate of asbestos cement is easily distorted and damaged by the above-mentioned force.

In particular, in the case of glass fiber-reinforced cement boards, the entanglement of fibers cannot be expected, and the buckling strength of the ungrown boards is considerably lower than that of raw asbestos cement boards.
There is a high risk of damage.

By the way, gypsum has a faster setting speed than cement, so if gypsum is used instead of cement in the above dry method, the strength of the original plate when it is taken out by the belt conveyor can be considerably increased, and the It is considered to be effective in preventing distortion and damage.

However, in this case, a new problem arises in that the forming using the pressure rolls described above for finally setting the thickness of the original plate is hindered due to the early setting of the plaster.

The present invention enables an operator to easily manually attach a molding plate on the outer side of the belt conveyor to the outside of the belt conveyor without impairing the moldability using pressure rolls in the dry process, and without worrying about deformation or damage to the molding original plate on the conveyor belt. The present invention provides a method for manufacturing a fiber reinforced board that allows it to be taken out.

That is, the method for producing a fiber reinforced board according to the present invention involves sprinkling water on a running belt conveyor, scattering raw materials consisting of gypsum, fibers, and aggregates on this belt conveyor, and forming the sprinkled raw materials into layers. Then, water is supplied to the surface of this raw material layer, a water-containing fiber mixed cement layer is formed on the raw material layer by a spray method, this laminated layer is compression molded with a pressure roll, and the molded body is cut with a roll cutter. , this cut piece,
This method is characterized by moving to an auxiliary belt conveyor that is faster than the traveling belt conveyor, widening the gap between the cut pieces, and taking out the cut pieces from the auxiliary belt conveyor.

The present invention will be explained below with reference to the drawings.

FIG. 2 schematically shows a manufacturing apparatus used in an embodiment of the present invention.

In FIG. 2, 1 is a belt conveyor.

Reference numeral 2 denotes a water tank, and the belt surface of the belt conveyor 1 during running is wetted by dripping water from the water tank 2.

3 is a flannel box, in which a mixed raw material S1 of gypsum, aggregate, and fibers (asbestos, glass fiber, or synthetic fiber) is dropped and deposited on a belt conveyor 1, and this deposited raw material is layered by a leveling roll 4. be accustomed to

This fiber-mixed gypsum raw material layer S2 is rendered hydrated by the dripping water from the water tank 5 and the wet water on the belt conveyor 1, and begins to harden due to the early setting properties of the gypsum.

6 is a spray, in which cement slurry and fibers are injected from separate nozzles, and these jet streams are in a mixed flow state,
It is sprinkled on the fiber mixed gypsum layer S3.

Thus, a spray layer gx of hydrated fiber-mixed cement is molded onto the fiber-mixed gypsum layer S3.

7 is a pressure roll, and the laminate A of the fiber-mixed gypsum layer S3 and the hydrous fiber-mixed cement spray layer g1 is compression-molded by this pressure roll 1, and the thickness of the laminate A is regulated to a predetermined thickness. .

In this case, the fiber mixed gypsum layer S3 has reached considerable hardness due to the early setting of the gypsum, but due to the fluidity of the hydrous fiber mixed spray layer g1, the pressure applied from the compression pressure roll 7 is small. be.

Therefore, the considerably hardened fiber-mixed gypsum layer S3 does not break under pressure, and the thickness of the laminate A is increased by the pressure roll 7 by reducing the thickness of the layer g1 by spraying the water-containing fiber mixture.

8 is a roll cutter, and the laminate A1, which has been formed to a predetermined thickness, is cut into a desired length by this roll cutter 8.

Reference numeral 9 denotes an auxiliary belt conveyor, and its running speed is higher than that of the belt conveyor 1.

Therefore, the above cut piece A2..., that is, the raw original plate A.
. . is enlarged when the raw original plate A2 is transferred to the auxiliary belt conveyor 9.

The raw original plates A2..., which are transferred by the auxiliary belt conveyor 9 with their mutual interval widened, are transported by the auxiliary belt conveyor 9.
In the vicinity of the terminal end of the belt conveyor 9, it is manually taken out to the outside of the belt conveyor 9.

In this case, the raw original plate A2 is subjected to a force in the running direction of the auxiliary belt conveyor 9, but since the strength of the raw original plate A2 has reached sufficient strength for early setting of the fiber-mixed gypsum layer, the raw original plate A2 is The raw original plate A2 can be safely taken out from the auxiliary belt conveyor 9 without being distorted or damaged.

In the present invention, the thickness ratio of the fiber-mixed gypsum layer to the sheet metal thickness is preferably 0.2 to 0.5 times.

The method for manufacturing a fiber reinforced board according to the present invention is as described above, and in the dry method, the raw original board can be safely taken out from the belt conveyor without deforming or damaging the raw original board, Furthermore, the thickness of the raw original plate can be satisfactorily set using a pressure roll.

Therefore, according to the present invention, it is possible to satisfactorily prevent material loss due to breakage of the raw original plate.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a conventional dry manufacturing method for a fiber-reinforced cement board, and FIG. 2 is an explanatory diagram showing an embodiment of the present invention. In the figure, 1 is a belt conveyor, 2 is d, 3 is a fluff box for dispersing the fiber mixed gypsum raw material, 5 is a water tank, 6 is a sprayer, 1 is a pressure roll, 8 is a roll cutter, A2, A2...・ is the raw original board, and 9 is the auxiliary belt conveyor.

Claims (1)

[Claims] 1 Sprinkle water on a running belt conveyor, sprinkle raw materials consisting of gypsum, fibers and aggregates on this belt conveyor,
This spread raw material is leveled into a layer, water is supplied to the surface of this raw material layer, a water-containing fiber mixed cement layer is formed on the raw material layer by a spray method, this laminated layer is compression molded with a pressure roll, and the formed The body is cut into 9 pieces by a roll cutter, and the cut pieces are transferred to an auxiliary belt conveyor that is faster than the traveling belt conveyor, and the gaps between the cut pieces are widened and the cut pieces are taken out from the auxiliary belt conveyor. A method for manufacturing a fiber reinforced board.