JPS5940495B2 - Manufacturing method for fiber reinforced products - Google Patents

Description

[Detailed description of the invention] The present invention is made by mixing a fibrous substance such as glass fiber into an inorganic slurry such as cement, a synthetic resin solution, viscose, etc. (hereinafter collectively referred to simply as slurry). The present invention relates to a method for uniformly dispersing fibers in a slurry in the production of fiber-reinforced products.

Conventionally, various methods have been tried to mix fibers into slurry, but in each method, the more fibers are mixed in, or the longer the fibers are, the more difficult it is to mix fibers into slurry. It was not possible to achieve uniform dispersion and a satisfactory result could not be obtained.

A few examples of conventional methods will be described above. 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 not preferable because the fibers become entangled with the blades 1a and the shaft lb. In this method, it is also possible to use a Σ-shaped blade as shown in Fig. 2, but in this case as well, the fibers are wrapped around the part indicated by the symbol Ic, and the triangular chevron-shaped blade on the inner wall has its valley. It has the disadvantage that fibers get stuck in some areas. Next, as a second method, there is a method using a vertical universal mixer having a structure as shown in FIG. In other words, differential gears 12, 13, and 14 that mesh with the internal gear 11 are provided inside the internal gear 11 as shown in FIG. is fixed, and by rotating the gear 12, the hooks 16 and 17 are caused to rotate and revolve around their own axis, a so-called planetary motion. This allows the hook to trace a trajectory as shown in Figure 3C. In this method, slurry and fibers are placed in the tank 18 of this all-purpose mixer, and the fibers are uniformly dispersed in the slurry. In this method, the fiber length is limited to about 15 ln, and if it exceeds this, the fibers will become entangled with the hooks, which is not preferable. A third method is to use a vacuum extruder, which is generally used for extruding cement, gypsum, etc., and supply fibers such as glass fiber to the vacuum extruder, thereby dispersing the fibers into the slurry. . In this method, the fiber length is 6
Up to the nth position, fibers are dispersed and mixed into the slurry, but
If the length exceeds 6 fields, the fibers will not be dispersed and will be cut. In order to overcome the drawbacks of this method, a method may be considered in which preliminary blending is carried out in a dry state in a secondary, 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 a fiber discharge pipe is provided in the vicinity of the central axis of the spray zone of the slurry ejected when the slurry is sprayed, and the short fibers are sprayed.

However, in this method, since the fiber discharge pipe is placed in the slurry spray zone, the slurry hits this discharge pipe and accumulates, which falls and gets mixed in, which adversely affects the dispersion of the fibers. The invention has been made in view of the above points, and provides a mixture in which an impeller for transporting slurry and a roping cutter are arranged close to each other on the same axis, and cut fibers are mixed directly into the slurry sent by the impeller. The present invention provides a method for manufacturing a fiber-reinforced product, which forms a more fiber-reinforced product.

The method of the present invention will be explained in detail below based on the illustrated embodiment. FIG. The slurry supply pipe 23 is a hole for supplying roping.

The internal structure of this device is as shown in FIG.
A pump for feeding from 6, the opening cutter 2
They are placed on both sides of 4. Describing the structure of the roping cutter 24 and the pump 25 in more detail, as shown in FIG. They are fixed to husbandry shafts 34 and 35 so as to be in contact with each other. A drive gear 36 is fixed to this shaft 34, and by rotating this drive gear 36, the cutter roller 31 and rubber roller 33 are rotated as shown by the arrows. (
In this case, the shaft 35 may also be rotated in the opposite direction at the same speed as the shaft 34 by an appropriate drive source. ) As the cutter roller 31 and rubber roller 33 rotate, the roping 20 that is supplied to the area where these rollers contact is pulled and fed by the nib pressure of the cutter roller 31 and rubber roller 33, and is cut by the cutter 1. 0 That is, although not shown, a spring action is applied to each cutter 32 embedded in the cutter roller 31, and when the cutter 32 comes to a position where it comes into contact with the rubber roller 33, the cutter 32 is moved by the rubber roller. The cutter 1 is pushed by the roller 33 and sinks into the roller due to the action of the spring, and the roping between the rubber roller and the cutter 1 is cut by the pressure of the spring at this time. In this way, the roping is sequentially cut to a certain length. The pump 25 has a structure as shown in FIG. 8, and includes an impeller 41 fixed to a hollow shaft 42 coaxial with a shaft 34 to which a cutter roller 31 is fixed, and a shaft 3 to which a rubber roller 33 is fixed.
By rotating a drive gear 45 fixed to the shafts 42 and 44, the impellers 41 and 43 are moved in the direction of the arrow, that is, toward each other. Rotate in the opposite direction. As is clear from FIG. 6, since the pumps 25 are arranged on both sides of the cutter 24, the first drive gear 45 is also provided on both sides of the device main body 21, so that the impellers of both pumps rotate. ing. As the impeller rotates, the slurry transferred from the slurry supply pipe 22 is alternately sent by the impeller 41 and the impeller 43 and is discharged from the discharge port 26. When the slurry is thus sent out by the impeller, the fibers cut by the roping cutter 24 fall and are mixed into the slurry, as is clear from FIG. What is thus discharged from the discharge port 26 is a mixture in which the fibers cut by the roping cutter 24 are mixed. This mixture is directly put into a mold to form a fiber-reinforced product, or the mixture is temporarily stored in a storage tank and then put into a mold or sprayed with a spray gun to form a fiber-reinforced product. As explained above, according to the method of the present invention, immediately after the slurry is sent by the impeller 1, the fibers cut by the roping cutter 1 fall and are mixed into the slurry, so that different parts of the device There is no fear of getting entangled. Thus, the fibers can be dispersed in the slurry to form the desired fiber reinforced product.

[Brief explanation of drawings]

Figures 1 to 4 are views showing the conventional method of mixing fibers into slurry, Figure 5 is a plan view of an apparatus for mixing fibers into slurry according to the method of the present invention, and Figure 6 is a diagram showing a conventional method of mixing fibers into slurry. Its sectional views, FIGS. 7 and 8, are sectional views taken along the - line and - line in FIG. 6, respectively. 20...Roping, 21...Device main body, 22...Slurry supply pipe, 24...
・Roping cutlet 1, 25...pump.

Claims (1)

[Claims] 1 A set or more than one set of roving cutters and an impeller for transporting slurry are arranged coaxially and alternately adjacent to each other, and a discharge port is provided directly below the roping cutter, and immediately before the slurry is sent out from the discharge port by the impeller. A fiber-reinforced product in which the fibers immediately after being cut by the roving cutter are dispersed and dropped on the upper surface of the slurry on the discharge port, and the fibers are then discharged as they are to be molded from a mixture in which the fibers are dispersed and mixed into the slurry. Production method.