JPH0839682A - Fiber composite linear body and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a fiber composite linear body which has a high tensile strength and nonconductive properties superior in weather resistance and is free from a twist on a fiber core, by a method wherein a synthetic resin coating superior in the weather resistance is applied to the outside of the linear body comprised of a fiber having a high tensile strength. CONSTITUTION:A fiber core A is formed of a plurality of high tensile and low ductile aramid fibers which are drawn out of feed reels 1 each by bundling them. Then the fiber core A is led to a thermosetting resin tank 2 and impregnated with thermosetting resin(for example, unsaturated polyester, epoxy. Furthermore, the fiber core A is formed into the fixed diameter by passing through a die 3 (or a mold), surplus resin is omitted and introduced into a heater 4. Thus the thermosetting resin is made into a semicured state by heating at 90 deg.C for 30 seconds, introduced into a lapping machine 5 and the outer circumference of the fiber core A is lapped unidirectionally by a bundled fiber yarn. As for the fiber yarn, unification of the fiber core may be encouraged by applying the thermosetting resin to the inside of winding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a tension member for a PC structure (prestressed concrete), a catenary line for a railway,
The present invention relates to a fiber composite linear body used for hangers, branch lines, span wires, messenger wires of communication cables, etc., and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, PC is used as a tension member for a PC structure.
Steel is used, and galvanized steel stranded wire is used as various overhead wire materials for railways and messenger wires for communication cables. Japanese Patent Publication No. Sho 62-18679 is known as a high-strength material using fibers.

[0003]

In a PC structure, an outer cable or an extra-dust cable system in which a tension member is exposed to the outside air is often used, and a conventional PC steel material has a problem in terms of corrosion resistance and the like. There is.

In the overhead lines of railways, there is a problem with the galvanized steel stranded wire in terms of omission of insulators, prevention of electric shock, reduction of slack, and the same problem with messenger wires of communication cables.

Due to the above problems, it is possible to use the linear body disclosed in the above Japanese Patent Publication No. 62-18679, which is a non-metallic material.

However, according to the technique of this disclosure, a fiber core is impregnated with a thermosetting resin, its peripheral surface is sprinkled with a desiccant, and then its outer periphery is covered with a braided fiber, which requires a lot of rubbing. At the same time, there is a manufacturing problem that the effect of preventing the impregnated resin from leaking is not sufficient.

[0007] As described above, since it is used by being exposed to the outside air in any of the PC structure, the railroad, and the communication cable as described above, it has a drawback that it is easily deteriorated.

The present invention has been made in order to solve the problems and drawbacks of the above conventional products and the proposed technique, and its purpose is high tensile strength, non-conductive property excellent in weather resistance, and twisting in the fiber core. An object of the present invention is to provide a fiber-composite linear body and a manufacturing method thereof.

[0009]

The present invention has the following features in order to achieve the above object.

The first characteristic is that a synthetic resin coating having excellent weather resistance is applied to the outer surface of a linear body made of fibers having high tensile strength.

The second characteristic is that a plurality of fiber cores are formed by twisting a fiber core containing a thermosetting resin and wrapping fiber threads bundled in the outer periphery in one direction as a linear body made of fibers having high tensile strength. It is to use the one.

The third feature is that the fiber yarn is further lapped in the opposite direction on the unidirectional wrapping.

The fourth characteristic is that a plastic flowable substance is interposed between the linear body and the synthetic resin coating.

Another feature of the present invention is to disclose a method for efficiently producing a fiber-composite linear body having a constitution having the above-mentioned features, the contents of which will be described in the following Examples. Detailed description.

[0015]

【Example】

(Example 1) FIG. 1 is a process chart of Example 1, and as shown in FIG. 1 (A), first, a plurality of high-tensile-low-elongation aramid fibers fed from each supply reel 1 are bundled. The fiber core A is formed. Next, the fiber core A is introduced into the thermosetting resin tank 2 and impregnated with a thermosetting resin (for example, unsaturated polyester or epoxy). Further, it is formed into a predetermined outer diameter by passing it through a die 3 (or a mold), and excess resin is dropped and introduced into the heater 4. Here, the thermosetting resin is semi-cured by heating at 90 ° C. for 30 seconds, and then introduced into the lapping machine 5, and the outer periphery of the fiber core A is unidirectionally moved by the bundled fiber threads 10. Wrap it. This fiber thread 10
For example, a thermosetting resin may be applied to the inner side of the winding to promote the integration of the fiber core. Figure 2 shows fiber core A with fiber thread 10
The figure shows a state in which the resin is lapped without any gaps, and the leakage prevention of the semi-cured resin is complete if the lines are lined with no gaps. The obtained fiber core A is wound on the winding reel 6.

Next, as shown in FIG. 1 (B), the fiber core A is unwound from a take-up reel 6, which is then twisted by a twisting machine 7.
And twist them together. Then, the twisted wire material was heated by the heater 8 to cure the semi-cured thermosetting resin, and wound by the winding reel 9 to produce a composite linear body.

As described above, when the thermosetting resin is semi-cured, the outer periphery of the thermosetting resin is lapped without any gap, so that the leakage of the resin can be surely prevented even without using the powder desiccant, and the twisting that has been conventionally caused. It is possible to prevent the fiber cores from adhering to each other. In addition, it is possible to eliminate defects in appearance such as protrusions caused by leakage of resin.

Next, a synthetic resin coating is applied to the outer surface of the linear body obtained by twisting the twisted strands 20 thus wrapped. As shown in FIG. 1C, this coating is carried out by introducing the linear body from a supply 11 through a guide 12 to an extruder 13 equipped with a polyethylene feeding hopper 14. Although the linear body is heated by the heater 8 in FIG. 1 (B), it is also heated by the extruder 13. Therefore, the heater 8 is omitted and the twisted linear body is directly pressed. It is also possible to lead to 13.

The thickness of the coating is preferably 0.4 mm or more to prevent pinholes from being generated, and carbon black is mixed in polyethylene to promote its weather resistance and light-shielding property.

The pressure coating needs to be about 150 ° C. or higher for heating and melting polyethylene, but when the temperature is too high, deterioration of the linear body is promoted. Therefore, when the linear body is aramid fiber, It is important to keep the temperature below 200 ° C.

The extruded and coated linear body includes a water cooling tank 15, a scale counter 16, a caterpillar capstan 17, and a cutting machine.
It is wound on a winder 19 with a diameter of 18. FIG. 3 is a cross-sectional view of the wound composite linear body, in which 20 is a twisted wire in which the fiber core 10 is wrapped with the fiber yarn 10, 21 is a synthetic resin coating, and 22 is a completed fiber composite linear body.

(Embodiment 2) FIG. 4 is a process chart showing the manufacturing method of Embodiment 2. As shown in FIG. 4 (A), first, a plurality of high tension / low elongation wires fed from each supply reel are used. The aramid fibers are bundled to form a fiber core A. Next, the fiber core A is introduced into the thermosetting resin tank 2 and impregnated with a thermosetting resin (for example, unsaturated polyester or epoxy). Further, it is formed into a predetermined outer diameter by passing it through a die 3 (or a mold), and excess resin is dropped and introduced into the heater 4. Here, the thermosetting resin is semi-cured by heating at 90 ° C. for 30 seconds, then introduced into the lapping machine 5A, and the outer periphery of the fiber core A is unidirectionally moved by the bundled fiber threads 10. Wrap it. Further, it is introduced into the lapping machine 5B and lapping is performed in a direction opposite to the lapping direction without any gap. These fiber yarns 10 may be coated with a thermosetting resin on the inner side of the winding to promote integration of the fiber cores. Figure 5
Shows a state in which the fiber core A is wrapped with the fiber thread 10 without any gaps. If the fiber core A is lined up without gaps, the leakage of the semi-cured resin is completely prevented. The obtained twisted wire 20 is wound on the winding reel 6.

Next, as shown in FIG. 4 (B), the twisted wire 20 obtained by lapping the fiber core A is unwound from a winding reel 6 and introduced into a twisting machine 7 for twisting. I do. Then, the twisted wire material was heated by the heater 8 to cure the semi-cured thermosetting resin, and wound by the winding reel 9 to produce a composite linear body.

In this way, when the thermosetting resin is semi-cured, the outer circumference of the thermosetting resin is lapped without any gap, so that the leakage of the resin is surely prevented and the fiber cores are adhered to each other at the time of twisting, which has occurred conventionally. It is also possible to prevent the twisting of the fiber core by bidirectional wrapping.

As the fiber core, glass fiber or the like can be used in addition to aramid fiber, but carbon fiber is not preferable because it is non-conductive. Further, as the fiber yarn to be wrapped, aramid fiber, vinylon, polyester or the like can be used, but aramid fiber is preferable as the tension member for the PC structure in order to enhance alkali resistance.

The linear body obtained by twisting the twisted strands 20 produced in this manner is coated with a synthetic resin coating 21 in the same manner as in FIG. Such a fiber composite linear body 22 is used.

The synthetic resin coating 21 has a high flexibility as a linear body when the twisted groove of the wire 20 is exposed, and when the outer peripheral surface is smooth so that the twisted groove does not appear. Since the frictional resistance of the linear body is reduced and the wear resistance is improved, the shape can be selected according to the purpose.

The coating material is preferably polyethylene containing carbon black, but resins such as epoxy, polypropylene, vinyl chloride, nylon, and acrylic can be selected and used depending on the degree of exposure to ultraviolet rays and the like in use.

Further, since the twisted linear body of the strands 20 is covered with the coating 21 on the outer periphery thereof, if there is a protrusion or the like on the outer surface of the linear body itself, it is also effective.

In order to facilitate the coating and shape formation by the coating, a fluid silicone oil, grease, wax, paraffin or palm oil is provided between the linear body and the coating so as not to flow between the linear body and the coating. It is preferable to interpose a plastic flowable substance such as oil paint, glycerin or asphalt. This interposition is on the linear body before coating,
This can be easily done by applying the substance.

(Test Example) FIG. 6 is a table showing the results of an outdoor exposure test of the fibrous linear body 22 having the cross-sectional structure of FIG. In this case, the fiber core A is formed by bundling 18 6000 denier aramid fibers, impregnating vinyl ester with the ratio of the fibers and the thermosetting resin being 65% by volume, and wrapping the aramid fibers. Is. The stranded wire 20 has a wire diameter of 4.2 mm, and the coating 21 after twisting 7 of the stranded wire 20 is carbon black polyethylene having a thickness of 0.5 mm, and the wire 22 has an outer diameter of 13.6 mm.

As can be seen from the figure, the linear body 22 of the present invention shows almost no deterioration and the strength retention ratio is comparative, as compared with the fiber composite linear body 23 without the coating 21 manufactured for comparison. It is more than 10% higher per year and can withstand outdoor use.

[0033]

As described in the above items, since the fiber composite linear body of the present invention is composed of the non-conductive synthetic fiber, there is no fear of corrosion or electric shock.

Further, since the fibers are formed by bundling and twisting the bundled fiber cores and further coating the outer periphery thereof with a synthetic resin, the fibers are not inferior in conventional tensile strength member to tensile strength. Since it is highly flexible and has excellent weather resistance, it is suitable for use as a high tensile strength member used outdoors. Moreover, its production is easy and suitable for factory production.

[Brief description of drawings]

FIG. 1A is a process diagram of a manufacturing method according to a first embodiment.
Shows the front stage, (B) shows the middle stage, and (C) shows the rear stage.

FIG. 2 is a perspective view showing a state in which the outer circumference of the fiber core is lapped in one direction with a bundle of fiber threads without a gap.

FIG. 3 is a cross-sectional view of a fiber composite linear body manufactured according to Example 1.

FIG. 4A is a process diagram of the manufacturing method in Embodiment 2, and FIG.
Shows the front stage, and (B) shows the middle stage.

FIG. 5 is a perspective view showing a state in which the outer circumference of the fiber core is wrapped in both directions with a bundle of fiber threads without a gap.

FIG. 6 is a chart showing outdoor exposure test results of the linear body of the present invention.

[Explanation of symbols]

1 Supply reel 2 Thermosetting resin tank 3 Dice 4
Heater 5, 5A, 5B Wrapping machine 6 Take-up reel 7
Twisting machine 8 Heater 9 Take-up reel 10 Concentrated fiber yarn 11 Supply 12 Guide 13 Extruder 14 Polyethylene feeding hopper 15 Water cooling tank 16 Scale counter 17 Catapular capstan
18 Cutting machine 19 Winding machine 20 Stranded wire 21 Synthetic resin coating 22 Fiber composite linear body of Example 23 Fiber composite linear body without coating A Fiber core

Claims (7)

[Claims] 1. A fiber-composite linear body, characterized in that a synthetic resin coating is formed on the outer surface of a linear body made of fibers. 2. A fiber-shaped linear body contains a thermosetting resin, and is formed by twisting a plurality of fiber cores obtained by wrapping fiber threads bundled in the outer periphery in one direction. The fiber composite linear body according to claim 1. 3. A linear body made of fibers contains a thermosetting resin, and wraps fiber yarns bundled on the outer periphery in one direction, and further wraps the fiber yarns bundled on the outer periphery in the opposite direction. The fiber composite linear body according to claim 1 or 2, wherein a plurality of fiber cores are twisted together. 4. The fiber composite linear body according to claim 1, wherein a plastic flowable substance is interposed between the fiber linear body and the synthetic resin coating. 5. A fiber core impregnated with a thermosetting resin is heated to make the thermosetting resin semi-cured, and the bundled fiber threads are unidirectionally wrapped around the outer periphery of the fiber core. , A step of twisting a plurality of the obtained fiber cores, and heating this to cure a semi-curable thermosetting resin or introducing it into a non-heated synthetic resin extrusion coating, and comprising the above-mentioned twisted fibers And a step of forming a synthetic resin coating on the outer surface of the linear body, the method for producing a fiber composite linear body. 6. The method according to claim 5, further comprising the step of wrapping the bundled fiber yarn around the outer periphery of the fiber core in one direction, and further wrapping the outer periphery thereof in the opposite direction with the bundled fiber yarn. The manufacturing method described. 7. The method according to claim 5, further comprising a step of applying a plastic flowable substance to the outer surface of the filamentous linear body before forming the synthetic resin coating.