JPH05318434A - Production of cement tile - Google Patents

Abstract

PURPOSE:To enhance the filling density of a cement material and to eliminate the density difference and strength difference of an uneven part when an uneven product is molded by a roll-palette method. CONSTITUTION:In a roll-slipper molding method wherein a cement compound S is supplied to a series of palettes 2...2 each having a surface shape shaping the rear shape of a tile from a hopper 3 to be pressed and supplied by the press supply roll 4 provided in the hopper 3 and the surface of the compound is molded by the slipper 5 arranged to the lower end part 3A of the hopper 3, the press supply and surface molding of the cement compound S are performed while ultrasonic vibration is applied to the press supply roll 4 and the slipper 5. The filling density of a material and the density and strength of the whole are uniformized by the action of ultrasonic vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved method for manufacturing cement roof tiles.

[0002]

2. Description of the Related Art Conventionally, so-called thick roof tiles having abundant surface undulations have been widely used as cement roof tiles together with flat slate roof tiles. As shown in FIG. 3, the thick roof tile manufacturing apparatus arranges a series of pallets P ... P having a surface shape for shaping the back surface of the roof tile by abutting them on the conveyor C.
The cement mixture S is supplied from the hopper H onto the pallets P ... P, the cement mixture S is pressed and supplied onto the pallet by the roll R in the hopper H, and the back surface shape for shaping the product surface shape is formed. A so-called roll slipper molding method is known in which a product surface shape is formed by the formed slippers T, the product is cut into pallets P, and the pallets P are conveyed to a curing step and cured by curing (for example, JP-A-3-213307). Bulletin etc.).

[0003]

However, in the conventional roll slipper molding method, the material is press-fitted and the surface is molded by one set of the compression roll R and the slipper T, so that the material mixing is restricted and the product thickness is reduced. However, it requires more than three times the maximum particle size of the aggregate in the cement formulation, and has the drawback that it is difficult to reduce the weight and thickness.

That is, in order to increase the product strength, it is considered that the compounded material is made into fine particles and the material is densely packed.
If the material is excessively finely divided, the fluidity of the material becomes too good, and the friction with the roll R is also reduced, resulting in defective winding on the roll R, resulting in the problem that the material is clogged. Therefore, in the roll slipper molding method, it is necessary to use a material having a particle size larger than that of so-called coarse aggregate, and there is a drawback that the strength improvement is limited.

Further, when a roof tile having a shape as shown in FIG. 2 is formed by the roll slipper method, the packing density of the mountain portion M becomes low due to the compression difference between the mountain portion M and the valley portion N of the tile shape.
There is a drawback that the strength of this portion is considerably lower than that of the valley portion N, and there is a problem that it is difficult to obtain a product having a uniform strength as a whole.

[0006]

SUMMARY OF THE INVENTION In view of the above problems, the present invention enables smooth molding without causing material clogging even when the compounding material is made into fine particles, and the overall strength is independent of the peaks and valleys. The purpose of the present invention is to provide a method for producing a cement roof tile that can be homogenized.

[0007]

That is, according to the method for manufacturing a cement roof tile of the present invention, the cement mixture S is supplied from the hopper 3 onto a series of pallets 2 ... 2 having a surface shape for shaping the roof tile back surface shape. Then, in the roll slipper molding method in which the cement mixture S is pressed and supplied by the pressure supply roll 4 provided in the hopper 3 and the surface is molded by the slipper 5 arranged at the lower end 3A of the hopper 3, the pressure supply is performed. It is characterized in that the cement mixture S is pressed and supplied and surface molding is performed while applying ultrasonic vibration to the roll 4 and the slipper 5.

[0008]

In the apparatus of the present invention, ultrasonic vibrations are applied to the cement mixture S supplied from the hopper at the time of compression supply by the compression roll and at the surface molding by the slipper. The thixotropy is exhibited, and even if the material is composed of a few fine particles, the material flows smoothly and the material clogging is prevented. For this reason, high-density compression molding is possible even if fine particle aggregate is added during material mixing, and it becomes possible to manufacture products with higher strength, and if the strength is the same as the conventional one, it is possible to reduce the wall thickness. It will be.

[0009]

Embodiments of the present invention will be described below. FIG. 1 is a sectional view of an apparatus for carrying out the method of the present invention.

A cement roof tile manufacturing apparatus 1 used in the method of the present invention supplies a cement mixture S from a hopper 3 onto a series of pallets 2 ... 2 having a surface shape for shaping the roof tile back surface shape, In the roll slipper molding apparatus 1 for pressing and supplying the cement mixture S with the pressure supply roll 4 provided in the hopper 3 and performing the surface molding with the slipper 5 arranged at the lower end 3A of the hopper 3, the pressure supply roll An ultrasonic vibration generator V is laid on the 4 and the slippers 5.

The vibrating device V is a magnetostrictive vibrating device,
The vibration generator V for the pressure supply roll 4 is built in the bearing 4A portion of the pressure supply roll 4, and the vibration generator V for the slipper 5 is built in the main body of the slipper 5.

Next, a case where the thick roof tile shown in FIG. 2 is actually molded by the molding apparatus 1 will be described. A cement mixture consisting of Formula 1 in Table 1 was supplied to the hopper of the above device 1,
A roof tile having a shape as shown in FIG. 2 was formed while applying an ultrasonic vibration of 50 kc by a vibrating device V. As a comparative example,
A roof tile was molded from the cement mixture consisting of the mixture 2 in Table 1 which is an example of the conventional mixture in the same manner as the conventional one without operating the vibration generator V. When the density and strength were measured, the results shown in Table 2 were obtained.

[0013]

[Table 1]

As is clear from Table 2, the products of the same shape, which are produced by the method of the present invention, have improved strength as compared with the conventional products, and in particular, the peak portion M and the valley portion in the tile shape shown in FIG. It was confirmed that there was almost no difference in N density and strength. Similarly, with respect to the density, in the example of the present invention, both the peak portion M and the valley portion N were uniform in density. It should be noted that molding was performed without using the vibration oscillating device V with the formulation 1 in Table 1, but the material was significantly clogged, and most of the products failed in molding.

[0015]

[Table 2]

[0016]

As described above, according to the present invention, a product having a uniform strength and a uniform density, which has been difficult to manufacture by the conventional method, can be easily molded by the roll pallet method.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a perspective view of roof tiles molded by the apparatus of Example and the apparatus of Comparative Example.

FIG. 3 is a side view of a conventional example.

[Explanation of symbols]

 1 Cement roof manufacturing equipment 2 ... 2 Pallet 3 Hopper 4 Slipper S Cement mixture V Ultrasonic vibration generator

Claims (1)

[Claims] 1. A cement mixture S is supplied from a hopper 3 onto a series of pallets 2 ... 2 having a surface shape for shaping the roof tile back surface, and the cement is mixed by a pressure supply roll 4 provided in the hopper 3. In the roll slipper molding method in which the material S is pressure-supplied and the surface is molded by the slipper 5 arranged at the lower end portion 3A of the hopper 3, the cement mixture S is cemented while applying ultrasonic vibration to the pressure-supply roll 4 and the slipper 5.
A method for producing a cement roof tile, which comprises press-feeding and surface molding.