JPS5929403B2 - How to form fiber reinforced products - Google Patents

Description

Detailed Description of the Invention The present invention involves mixing a fibrous substance such as glass fiber into an inorganic slurry such as cement, a synthetic resin solution (hereinafter collectively referred to simply as slurry), or a dry powdered inorganic material. The present invention relates to a method for uniformly dispersing fibers in a slurry or dry powdered inorganic material in the production of fiber-reinforced products made by the invention.

Conventionally, various methods have been tried to mix fibers into slurry or dry powdered inorganic materials, but none of these methods work as the number of fibers mixed in increases or the length of the fibers increases. It is true that the fibers could not be uniformly dispersed in the slurry or dry powdered inorganic material, and a satisfactory result could not be obtained.

A few examples of conventional methods will be described below.

The first method is to put slurry and fibers into a horizontal kneader 1 having a structure as shown in FIG. 1 and disperse them.

This method is preferable because the fibers become entangled with the blades 1a and the shaft 1b.

In this method, it is also possible to use a blade shaped like the one shown in Fig. 2, but in this case as well, the fibers are wrapped around the part indicated by the reference numeral 1c, and the triangular chevron-shaped blade on the inner wall has its valley part. It has the disadvantage that fibers become clogged.

Next, as a second method, there is a method using a vertical universal mixer having a structure as shown in FIG.

In other words, as shown in Figure 3B, the internal gear 11
Differential gears 12, 13, 14 that mesh with the gears 12, 13, 14 are provided inside the
4 has husband λ hooks 16 and 17 fixed thereto, and rotates the gear 12 (thus, the hooks 16 and 1γ
is designed to cause so-called planetary motion, rotating and revolving around its axis.

This allows the hook to trace a trajectory as shown in FIG. 3C.

Put the slurry and fibers into the tank 18 of this all-purpose mixer,
This is a method of uniformly dispersing fibers in a slurry.

In this method, the fiber length is limited to 15rn4 degrees, and if it exceeds this, the fibers will become entangled with the hooks, which is not preferable.

A third method is to utilize a vacuum extruder, which is generally used for extruding cement, gypsum, etc., and supply fibers such as Niklas fibers to disperse the fibers into the slurry.

In this method, the fibers are dispersed and mixed into the slurry until the fiber length reaches about 6 mm, but when the length exceeds 6 mm, the fibers are no longer dispersed and have the disadvantage of being cut.

In order to overcome the drawbacks of this method, a method can be considered in which preliminary blending is carried out in a dry state in a kneader, and then fibers are dispersed in a slurry using a twin-screw vacuum extruder.

However, even with this method, it was not possible to disperse the fibers more uniformly or to prevent the fibers from being cut.

Furthermore, as shown in FIG. 4, there is a method in which short fibers are sprayed by providing a fiber discharge pipe in the vicinity of the central axis of the spray zone of the slurry ejected when the slurry is sprayed.

However, in this method, since the fiber discharge pipe is disposed in the slurry spray zone, the slurry hits the discharge pipe and accumulates, which falls and gets mixed in, which adversely affects the dispersion of the fibers.

In the present invention, slurry or dry powdered inorganic material and cut short fibers are scattered and dropped like rain, so that the fibers are uniformly dispersed and mixed into the slurry or dry powdered inorganic material. A method of forming a fiber reinforced product is provided.

The method for forming the fiber reinforced product of the present invention will be explained below with reference to each of the illustrated embodiments. Figures 5 and 6 relate to the first embodiment, and in these figures 41 is a tank. , 42 is a slurry or dry powder inorganic material supply pipe rotatably attached to the tank 41, and a rotating conical plate 43 is fixed to the lower end thereof.

Therefore, due to the rotation of the supply pipe 42, this rotating conical plate 4
3 are also rotated together.

In addition, a plurality of holes 42a are formed at the base of the supply pipe 42, that is, near the rotating conical plate 43, and the slurry or dry powdered inorganic material that has been sent comes out of the pipe through these holes 42a. It is structured so that it flows or slides along the surface 43a of the rotating conical plate 43.

44 is a roving cutter, which cuts the roving 45 to an appropriate predetermined length and then blows out the cutter.

In this embodiment, the roving cutter 44 is arranged so that the fibers cut by the roving cutter 44 are blown near the surface 43a of the rotating conical plate 43.

Next, the operation of this first embodiment will be explained.

First, when the tube 42 is rotated by a driving chain wheel 46 fixed to the tube 42 as shown in the drawing, a rotating conical plate 43 is fixed to the tip of the tube 42.
is also rotated together with this.

At the same time, if slurry or dry powdered inorganic material is sent from the supply pipe 42, the slurry or dry powdered inorganic material sent will be transferred to the surface 4 of the rotating conical plate 43 through the hole 42a.
The upper Q of 3a is sent out.

The slurry or dry powdered inorganic material coming out of the hole 42a is blown off in all directions by the centrifugal force caused by the rotation of the rotating conical plate 43.

On the other hand, the roving cut into short fibers by the roving cutter is cut on the surface 43a of the rotating conical plate 43 as described above.
The rotating conical plate 4 is sprayed nearby, similar to slurry, etc.
3 and scattered in all directions.

The slurry or dry powdered inorganic material and fibers blown away by the rotation of the rotary conical plate 43 are mixed and dispersed evenly in the slurry or dry powdered inorganic material to form a rain-like structure in the tank 41. Fall inside.

In this case, a portion of the slurry or dry powdered inorganic material or fibers hits the wall of the tank 41, and some of it falls along this wall.

The slurry or the mixture of dry powdered inorganic material and fibers that has fallen in this way is discharged from the discharge port 41a provided at the lower end of the tank 41.

The mixture discharged from the discharge port 41a may be directly put into a mold and hardened to form a fiber-reinforced product, or it may be temporarily stored in an appropriate storage tank and put into a mold as needed to be hardened to form a fiber-reinforced product. The product may also be formed by spraying it onto a mold or the like using a spray gun.

In this embodiment, it is possible that the air pressure inside the tank 41 increases due to the air used to blow out the fibers cut by the roving cutter.
It is preferable to form a large number of air vent holes 41b in the upper part of the tank 41.

As explained above, according to the method for forming a fiber-reinforced product of the present invention, the slurry or dry powdered inorganic material and the fibers are brought into good contact with each other in advance, and then both are scattered by the centrifugal force of the rotating conical plate 43, so that the fibers are dispersed in a rain-like manner. By dropping the fibers, it is possible to uniformly disperse them in the slurry or dry powdered inorganic material. Fibers of any length can be mixed and dispersed uniformly.

[Brief explanation of the drawing]

Figures 1 to 4 are diagrams showing conventional methods;
FIG. 5 is a sectional view of the first embodiment of the present invention, and FIG.
It is a sectional view taken along the line IV-IV in the figure. 41...Tank, 42...Slurry or dry powder inorganic material supply pipe, 43...
Rotating conical plate, 44...Roving cutter, 4
5...Roving.

Claims (1)

[Claims] 1. A supply member for supplying slurry or powdered inorganic material, a rotating conical plate that is horizontally rotatable and installed near the hole of the supplying member for discharging the slurry or powdered inorganic material, and on the rotating conical plate The rotating conical plate is positioned at an arbitrary height in a space under vacuum or atmospheric pressure, and the slurry or powder inorganic material supplying member A slurry or a powdered inorganic material is supplied to the upper surface of the rotating conical plate, and the fibers are supplied to the upper surface of the rotating conical plate by a fiber supplying member while being scattered by the centrifugal force caused by the rotation of the rotating conical plate and falling like rain. A method of forming a fiber-reinforced product, comprising mixing the fibers into the slurry or powdered inorganic material and casting the mixture to form the product.