JPS5932291B2 - spiral circular fabric - Google Patents

Description

[Detailed description of the invention] This invention is used for reinforcement of resin.

The invention relates to a special-shaped woven fabric in which the woven fabric has a continuous circular shape and a spiral shape. Ordinary textiles have a rectangular shape that extends linearly in the warp direction with a constant width, so when cutting circular or trapezoidal shapes from rectangular textiles, a large amount of fabric is lost.

Also, due to cutting, the warp or weft yarns take the shape of a chord in a circle and become very short at the ends, resulting in loss due to fraying or loss due to cutting extra large to prevent fraying. There are drawbacks. Furthermore, when making a three-dimensional object such as a conical shape or a trapezoidal shape from a flat sheet of cloth, a considerable amount of skill is required for folding and deforming. A similar problem also occurs when creating a shape having a circular arc. Since the narrow tape fabric has a tight texture on both sides, when it is curved, a difference in arc length between the inside and outside occurs, resulting in folds and wrinkles on the inside. Such pleats, wrinkles, etc. not only give a poor appearance, but also impair the reinforcing effect in the case of resin reinforcing fabrics. This invention eliminates the drawbacks of creating circular or three-dimensional shapes from conventional woven fabrics,
Less loss when forming circular or three-dimensional objects,
The object of the present invention is to provide a special type of woven fabric that can provide a product with excellent reinforcing effects when used industrially as a resin reinforcing woven fabric.

The woven fabric of the present invention has a plain weave structure or a ribbed structure, and the weft yarns are arranged in the radial direction of a circle drawn by the warp yarns with respect to the warp yarns arranged in the circumferential direction, and the weft yarns are arranged in the radial direction of a circle drawn by the warp yarns, and the weft yarns are arranged in the radial direction of the circle drawn by the warp yarns, and the weft yarns are arranged in the radial direction of the circle drawn by the warp yarns. The continuous parts overlap in layers forming the same circle, and when stretched, they take on a spiral shape. The materials used are not particularly limited, but include glass fiber,
It is preferable to use carbon fiber or the like. An embodiment of the configuration of this invention shown in the drawings will be described.

FIG. 1 is a plan view showing the principle of the circular fabric of the present invention;
FIGS. 2a and 2b are partially enlarged views of the circular fabric, and FIG. 3 is a sketch showing the circular fabric in a stretched state.

A plurality of consecutive warp yarns 1 are arranged concentrically, and all continuous weft yarns 2 are located radially in the radial direction of the circle drawn by the warp yarns 1, and at the intersection with the warp yarns 1, they are perpendicular to the warp yarns 1. and are organized.

The one shown in Figure 2a has a plain weave structure in which warp and weft yarns are alternately intertwined, and the one shown in Figure 2b has two weft yarns for one warp yarn. They alternately intertwine to form a ribbed structure. The selvage of the fabric is woven in the same way as ordinary fabrics, and differs depending on the type of loom such as shuttle loom, shuttleless loom, needle loom, etc., as shown in Figure 2 A and b. It is. The warp density of the woven fabric is constant in any portion in the length direction of the warp yarns, and can be formed to have the same density in any portion in the width direction.

However, the weft yarn density can be made constant with respect to the rotation angle along the circumference, but the density with respect to the length of the warp yarn has a relationship of inner and inner weft yarn density>outer and inner weft yarn density. Next, the effects of the woven fabric according to the present invention will be explained using specific application examples.

(1) Suitable for molding and reinforcing disc-shaped objects such as resin centrifuge rotating body end plates and flywheels.

For forming and reinforcing these disk-shaped objects, the filament winding method of reinforcing fibers can provide reinforcement in the circumferential direction, but if there is a central axis, reinforcement in the radial direction cannot be achieved.

Furthermore, when cutting a normally shaped woven fabric into a circular shape, it is not possible to arrange the threads in the entire circumferential direction and in the radial direction, so the reinforcing effect when using a disc-shaped object as a rotating body is insufficient. be. If the circular fabric according to the present invention is used, uniform fiber reinforcement is performed in both the circumferential direction and the radial direction, which significantly increases the strength of the rotating body, making it possible to rotate the rotating body at high speed. The effect is great.

Furthermore, since the woven fabric of this invention is organized in a plain weave or ribbed weave, the bending of the reinforcing fibers is extremely small, and the weft yarns are not bent as much as in leprosy weaving, so the characteristics of the reinforcing fibers can be utilized almost as they are. can.

In other words, if the reinforcing fibers are bent, the stress applied to the fabric will be concentrated in the bent part, so the fabric will break at a much lower force than its strength without fully utilizing the strength of the reinforcing fibers. However, in plain weave and ribbed weave structures, the reinforcing fibers have extremely little bending, so destruction due to such stress concentration can be prevented. Furthermore, since the plain weave or ribbed weave fabric is thin and has a high fiber density, the fiber volume content in the resin can be increased, and the weft threads are continuous. That is, since the warp threads are folded back at both the inner and outer ear portions, disturbances in the orientation of the warp yarns, especially in the vicinity of both ear portions, are prevented, resulting in high tissue stability. For these reasons as well, the woven fabric of the present invention was particularly suitable for reinforcing the above-mentioned resin-made high-speed rotating body. (2) Suitable for reinforcing resin tennis and badminton racket frames, or for reinforcing corners of containers, structures, window frames, etc.

When reinforcing such a three-dimensional object with fibers, compared to using a normal-shaped woven fabric, or a tape-like or sheet-like prepreg (fibers arranged in a row, resin-impregnated and semi-dried), the circular shape according to the present invention If the fabric is cut into appropriate circular arcs, cutting loss and cutting man-hours will be reduced, reinforcement work will be easier, and the reinforcing effect will be increased.

(3) Suitable for reinforcing conical or truncated conical articles such as resin cone drums, tapered bobbins, and funnels. These conical or truncated conical objects can be produced by cutting an arc of an appropriate length from a circular fabric along the weft thread and closing the cut ends with no fabric loss and with simple operations. . (4) The circular fabric of the present invention can be stretched into a spiral shape and fixed with resin, and then attached to a shaft to form a screw.

As described above, the circular fabric of the present invention is used for reinforcing resin, and in particular, when reinforcing circular objects, conical objects, and conical trapezoidal objects, there is little fabric loss.
It is easy to work and can produce high-quality secondary products.

[Brief explanation of drawings]

Figure 1 is a plan view of the circular fabric, Figure 2 is a partially enlarged view,
FIG. 3 is a sketch showing the stretched state. 1: warp, 2: weft.

Claims (1)

[Claims] 1 A reinforcing fabric made of resin, in which continuous warp and weft yarns made of reinforcing fibers constitute a plain weave structure or a ribbed weave structure, in which a plurality of warp yarns are arranged in the circumferential direction, and the weft yarns are the warp yarns. In the part where it intersects with the warp threads, it intersects with the warp threads at almost right angles, and the whole is arranged in the radial direction of the circle drawn by the warp threads, and in the part of one circumference or more, the same circles are continuously layered. A spiral circular fabric characterized by being formed.