JPH0640619Y2 - High strength composite twisted body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a twisted body formed of a composite filament made of high-strength fiber.

[Conventional technology and its technical problem]

The composite filament and its twisted body using high strength fiber are
It is disclosed in JP-A-57-25679, JP-A-61-28092 and the like.

By the way, a composite filament made of this kind of high-strength fiber, in particular, a twisted body made of a plurality of composite filaments having a carbon fiber as a strong holding material has a property of being strong and lightweight,
It lacks flexibility and toughness, and therefore cannot cope with a sudden increase in load and has a problem that it is difficult to collect a small diameter.

The present invention was devised to solve the above-mentioned problems, and its purpose is to improve the toughness and flexibility in addition to the characteristics such as cooperation, light weight and good corrosion resistance. It is to provide a strong composite twisted product.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a twisted body composed of a plurality of composite filaments having high-strength fibers as a strong holding material, and the twisted body is not simply composed of the composite filaments of the same material. , A first composite filament made of high-strength fiber typified by carbon fiber and a second composite filament made of another kind of high-strength fiber having a larger breaking limit elongation and flexibility Then, the second composite filament body is arranged on the core portion of the twisted body, and a plurality of first composite filament bodies are arranged on the outer periphery thereof to form a twisted structure.

[Action]

In the composite filament body or core wire arranged in the core part of the twisted body and the composite filament body or side wire arranged on the outer periphery thereof, the total length of the side wire is larger than that of the core wire per unit length of the twisted body. Is large. For this reason, when the core wire and the side wire are made of the same high-strength fiber composite filament body, when the twisted body is loaded and elongated, the core wire having a short length has a large elongation rate and reaches the limit of elongation. The side wire that has been cut and twisted at a certain twist angle essentially retains an elongation that can withstand the cutting load, but cuts in a short time due to the concentration of the load, and the original strength of the twisted body cannot be exhibited. That is, the breakage of the core wire controls the breakage of the entire twisted body.

On the other hand, in the present invention, the second composite filament 2 having a breaking limit elongation larger than that of the first composite filament 1 and made of flexible and high-strength fiber is used as the core wire, and the outer periphery of the second composite filament body 2 is used as the side wire. Since a plurality of the composite filaments 1 are twisted together, the elastic modulus of the core wire is lowered and the elongation of the core wire is allowed to be large. For this reason,
The lateral line will control the breakage, and a sudden load concentration on the lateral line due to the cutting of the second composite filament body 2 as the core wire is prevented. Therefore, the original strength of the twisted body is exhibited.

In addition, since the core portion is a composite filament body that is more flexible than the first composite filament body 1 that forms the side wire, the flexibility of the twisted body itself is improved, and the reel diameter of the winding reel is reduced. You can

〔Example〕

 An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an example of a high-strength composite filament body according to the present invention.

1 is a first composite striatum, 2 is a second composite striatum,
The second composite filament body 2 is arranged on the core, and six first composite filament bodies 1 having the same diameter are twisted around the outer periphery to form a stranded wire.

The first composite filament body 1 uses carbon fiber as a matrix, and the second composite filament body 2 uses aramid fiber, glass fiber, polyester fiber or the like, which has a greater elongation and flexibility than carbon fiber, as a matrix. To be

2 (a) and 2 (b) show the structures of the first composite filament body 1 and the second composite filament body 2 in an enlarged manner. A thermosetting resin 3 typified by a resin is impregnated, and the surface of the aggregate 1a shaped by a shaping die is semi-cured by applying a desiccant or the like, and then a plurality of these are twisted and twisted together. As shown in (b), the composite filament body 1b is used. Then, the fiber coating 4 is applied to the outer periphery of the composite filament body 1b by an appropriate method.

As described above, the first composite linear body 1 and the second composite linear body 2 have the second composite linear body 2 on the core and the second composite linear body 2 on the outer periphery at the stage where the impregnating resin 3 is uncured. It is made by arranging a plurality of the composite filaments 1 of 1 above, twisting them at a required pitch with a twisting machine, and then passing them through a heating device to cure the impregnated resin 3.

A concrete example of the present invention and its performance are shown below.

A second composite filament made of glass fiber, aramid fiber, polyester fiber and having a diameter of 1.7 mm is used as a core, and six first composite filaments made of carbon fiber having the same diameter are twisted around the core. 1
A twisted body having a diameter of 5 mm was obtained with a × 7 structure. For comparison, a twisted body having a carbon fiber composite filament as a core was obtained.

The first is the result of testing the toughness and flexibility of these.
Shown in the table.

As is apparent from Table 1, the cutting load and bending rigidity of the stranded wires of Nos. 1, 2, and 3 to which the present invention is applied are improved with respect to the comparative product. This is because the core of the twisted wire has a larger elongation than the outer wire, that is, the carbon fiber composite filament, so that early cutting of the core is prevented and rapid concentration of load on the side wire is avoided.

In addition, as a result of testing the minimum possible winding diameter of the stranded wires of Nos. 1 to 4 above, in the case of No. 4 (comparative product), the stranded wire diameter was 100 times the minimum, but No. 1 90 times, No. 2 was 80 times, and No. 3 was 50 times, and it was found that the body diameter can be reduced by 10 to 50% compared to the comparative product.

Further, the load-elongation up to the cutting of the stranded wires of Nos. 1 to 4 is schematically shown in FIG. No. 4, that is, a twisted body formed of a composite filament made of all carbon fibers is stretched linearly and cut rapidly. In contrast, the twisted body of the present invention of No. 1 to No. 3 stretches linearly until a constant load is reached, but thereafter, the stretch gradually increases as the load increases, leading to cutting. There is. This is because the core of the twisted body consists of a composite filament of high-strength fiber, which has a greater elongation than carbon fiber, so it is shorter than the carbon fiber composite filament that is twisted as a side wire. It shows that the lateral line and the elongation are well balanced, it is possible to expand along with the lateral line as the load increases, and the strength utilization factor is also improved.

In the present invention, a composite filament of a fiber having greater elongation and flexibility than the high-strength fiber represented by carbon fiber is arranged as the core of the twisted body, but if necessary, a side wire is further provided on the outer circumference of the twisted body. As different composite filaments, for example, composite filaments composed of carbon fiber and aramid fiber may be appropriately combined and twisted. Further, only one composite filament having different characteristics may be incorporated in the side wire so that deterioration of the twisted body can be easily determined. In addition, the present invention can be applied to the composite filament itself with a similar combination of core wire and side wire.

[Effect of device]

According to the present invention described above, in a twisted body composed of a plurality of composite filaments having high-strength fibers as a strong holding material, the first composite filaments 1 composed of high-strength fibers represented by carbon fibers are used. A second composite filament body 2 which is a side wire and is made of a high-strength fiber which is flexible and has a breaking limit elongation larger than that of the first composite filament body 1 is used as a core wire, and the second composite filament body 2 is provided on the outer periphery thereof with Since multiple first composite filaments 1 are arranged and twisted together, early rupture of the core wire can be achieved while taking advantage of the characteristics of the high-strength fiber, which has a small specific gravity, does not cause corrosion, is nonmagnetic, and has high strength. It is possible to provide this type of high-strength fiber twisted body that prevents the sudden concentration of load on the side wire, realizes the original high strength of the twisted body, has excellent toughness and flexibility, and can wind up with a small diameter. That is an excellent effect.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the high-strength composite twisted body according to the present invention, FIGS. 2 (a) and 2 (b) are enlarged sectional views of the composite filament in the present invention, and FIG. 3 is the present invention. 3 is a graph showing a load-elongation curve of a conventional product. 1 ... 1st compound linear body, 2 ... 2nd compound linear body.

Claims (1)

[Scope of utility model registration request] 1. A twisted product composed of a plurality of composite filaments having high-strength fibers as a strong holding material, wherein the first composite filaments 1 composed of high-strength fibers represented by carbon fibers are side wires.
A second composite filament body 2 made of a flexible and high-strength fiber having a larger breaking limit elongation than the first composite filament body 1 is used as a core wire,
A high-strength composite twisted body in which a plurality of the first composite filaments 1 are arranged on the outer periphery of the second composite filament 2 and twisted together.