JP3538649B2 - Carbon fiber strand and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to mosquito Bon fiber strands and the manufacturing method thereof for use primarily tendons of cables for tensioning a chord and prestressed structures for stringing beam.

[0002]

2. Description of the Related Art Conventionally, as a tension material used for a prestressed structure or the like, a PC steel wire or a PC steel twisted wire obtained by twisting a plurality of steel wires is widely used.

[0003]

However, the above-mentioned PC steel wire, PC steel twisted wire and the like have a problem that they are heavy and work efficiency is poor in installation work at a high place.

Therefore, in recent years, attempts have been made to use a light weight carbon fiber wire (carbon fiber strand) instead of PC steel wire or PC steel stranded wire as a tension material. Even if it has strength, it has the property that it is difficult to stretch, and if a tensile force greater than the tensile strength acts, it will break without elongation, and considering safety etc. as a tension material, it is a problem to use as a tension material was there.

In view of the state of the prior art as described above, the present invention is a carbon fiber wire, a carbon fiber strand, and a carbon fiber wire that is lightweight and has sufficient strength and elongation and is suitable for a tension material such as a cable for a prestressed structure. The purpose is to provide a manufacturing method.

[0006]

In order to solve the conventional problems as described above and to achieve the intended object, the invention of claim 1 is arranged so that a large number of carbon fibers form voids between the carbon fibers. twisted, a plurality of the carbon fibers obtained by coupling the respective carbon fiber internal voids between the carbon fibers in the synthetic resin material with filling of a synthetic resin material
Twist the wires so that there is a gap between each carbon fiber wire
The internal gaps between the carbon fiber wires.
Filled with grease material and the car with the synthetic resin material
It is characterized by bonding a Bonn fiber wire .

By configuring in this way, the carbon fiber wire has a margin to extend in the longitudinal direction compared to when twisted without generating voids, in other words, there is an allowance for elongation. Synthetic resin material in the interfiber gap
In addition , as the synthetic resin material in the gap between the carbon fiber wires is compressed in the radial direction, the carbon fibers are tensioned in the longitudinal direction, and the carbon fiber wires and the entire carbon fiber strands can be extended.

The invention of claim 2 is characterized in that, in addition to the structure of claim 1, the synthetic resin material is a thermoplastic resin such as polyethylene, nylon or saturated polyester.

By virtue of such construction, these thermoplastic resins are softer than the carbon fiber wire, so that the carbon fiber wire can suitably compress the synthetic resin material in the radial direction. When the tensile force is applied, it can be suitably stretched.

The invention of claim 3 is characterized in that, in addition to the structure of claim 1, the synthetic resin material is a heat-resistant polymer material such as fluororesin, aromatic polyamide or aromatic polyimide.

By virtue of such construction, these materials are softer than carbon fibers, so that the carbon fiber strands can have a suitable elongation when a tensile force is applied, and at the same time have high heat resistance and fire resistance construction. Can be used as material.

According to the invention of claim 4, a large number of carbon fibers are used.
The fibers are twisted together to create a space between the carbon fibers.
Form a fiber assembly wire, and the fiber assembly wire is a crosshead type.
Each car is passed through the extrusion machine and through the gaps between the carbon fibers.
To pressurize and fill the synthetic resin into the internal gap between the bon fibers
Forming a carbon fiber wire more, a plurality of the carbon
Create a gap between each carbon fiber wire in the fiber wire.
Twist together to form a fiber stranded wire,
Through a head-type extruder, the fiber than the gap between each fiber wires
It is characterized in that a synthetic resin is pressurized and filled into the internal space between the fibers .

By constituting in this way, it is possible to provide an elongation allowance when a tensile force acts on the carbon fiber wire.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the carbon fiber strand according to the present invention will be described with reference to the drawings.

FIG. 1 shows a carbon fiber strand used as a tension material for a prestressed structure or the like. This carbon fiber strand 1 causes a plurality of carbon fiber wires 2, 2... To form voids 3 between the carbon fiber wires. The gaps 3 between the carbon wire rods are made of synthetic resin 4
And the carbon wires 2, 2... Are connected with the synthetic resin material.

In the carbon fiber wire 2, a large number of carbon fibers 5, 5... Are twisted together so as to form gaps 6 between the carbon fibers, and the gaps 6 are filled with the synthetic resin material 7. Carbon fiber 5,5
... they are linked together.

The synthetic resin materials 4 and 7 are made of a thermoplastic resin such as polyethylene, nylon or saturated polyethylene. Since these thermoplastic resins are softer than the carbon fiber 5 or the carbon fiber wire 2,
When a tensile force acts on the carbon fiber strand 1, the carbon fiber strand 1 is pressed and compressed by the carbon fiber wires 2, 2. Similarly, when the tensile force acts on the carbon fiber wire 2, the synthetic resin filled in the gap is pressed by the carbon fiber 5 and compressed.

This carbon fiber strand 1 has a margin to extend in the longitudinal direction, in other words, has an allowance for elongation as compared with the case where the carbon fiber strands are twisted together without generating voids. Since the synthetic resin material 4 is compressed in the radial direction, the carbon fiber wires 2, 2,... Are tensioned in the longitudinal direction, and the entire carbon fiber strand 1 is extended.

Further, the carbon fiber wire 2 also has a margin to extend in the longitudinal direction as compared to the case where the carbon fiber wire 2 is twisted without generating voids, in other words, there is an allowance for elongation.
Since the synthetic resin material 7 in the gap between the carbon fibers is compressed in the radial direction, the carbon fibers 5, 5... Are tensioned in the longitudinal direction, and the entire carbon fiber wire 2 is extended.

The synthetic resin materials 4 and 7 are fire-resistant civil engineering and building materials by using a heat-resistant polymer material such as fluororesin, aromatic polyamide or aromatic polyimide in addition to the materials described above. Even in this case, since these polymer materials are softer than carbon fibers, moderate elongation occurs when a tensile force is applied.

Next, a method for producing the carbon fiber strand will be described.

FIG. 3 schematically shows an apparatus for producing a carbon fiber wire. In the figure, reference numerals 5, 5,... Denote carbon fibers wound around a roll, 8 denotes a twisting machine for twisting the carbon fibers 5, 5,. Is a preheater, and 10 is a crosshead type extruder for resin filling.

First, the carbon fibers 5, 5... Wound around each roll are sent to a twister 8, and a large number of carbon fibers are twisted together to form the fiber assembly wire 11. At this time, by setting various conditions such as the feeding speed and tension, voids are generated between the carbon fibers and twisted together. That is, the fiber assembly wire 11 is composed of carbon fibers 5 and 5.
... are twisted together with no tension.

Next, after this fiber assembly wire 11 is heated through a preheater 9, it is sent to a crosshead type extruder 10 for resin filling.

This resin-filling extrusion machine 10 is shown in FIG.
A structure in which an auxiliary pressurizing tank 13 is continuously arranged on the outlet side of the crosshead type molding machine main body 12 as shown in FIG. 5 and a molding die 14 matching the outer shape of the carbon fiber wire 2 is rotatably attached to the tip thereof. Are using things.
In the figure, reference numeral 15 denotes a heater.

In this extrusion molding machine 10, polyethylene,
A synthetic resin 16 made of a thermoplastic resin such as nylon and saturated polyethylene is melted and extruded to the crosshead portion. While passing through the auxiliary pressure tank 13, the synthetic resin 16 is removed from the gap between the carbon fibers on the outer periphery of the fiber assembly wire. The inside of the internal space 6 (shown in FIG. 5) is filled with a synthetic resin material under pressure.

The synthetic resin material adhering to the outer peripheral surface is scraped off by the molding die 14 while leaving a part.

When the filling of the synthetic resin material is completed, the carbon fiber wire 2 is formed by cooling with a cooling device (not shown), and the winding operation is completed on a roll (not shown).

Next, a method for producing carbon fiber strands will be described.

As shown in FIG. 6, the carbon fiber strands are produced by twisting a plurality of carbon fiber wires 2, 2... Fed from rolls 17, 17,. The fiber stranded wire 19 twisted together is passed through a crosshead type extruder 20 to pressurize and fill a synthetic resin material into the internal space between the wire strands of the fiber stranded wire 19.

First, the carbon fiber wire wound around each roll 17 is sent to a twister 18, and a plurality of carbon fiber wires 2, 2,... Are twisted together to form a fiber twisted wire 19. At this time, a gap 4 is formed between the carbon fiber wires 2 and 2 by setting various conditions such as a feeding speed and a tension.
(Shown in FIG. 8) and twisted together. That is, the carbon fiber wires 2, 2.

Next, the fiber twisted wire 19 is connected to a preheater 21.
And heated to a cross-head type extruder 20 for resin filling.

The resin-filling extrusion machine 20 is shown in FIG.
A structure in which an auxiliary pressurizing tank 23 is continuously arranged on the outlet side of the crosshead type molding machine main body 22 as shown in FIG. 3 and a molding die 24 matching the outer shape of the carbon fiber strand 1 is rotatably attached to the tip thereof. Are using things. In the figure, reference numeral 25 denotes a heater.

In the extrusion molding machine 20, the synthetic resin 16 is melted and extruded to the crosshead portion, and the synthetic resin 16 is passed through the auxiliary pressurizing tank 23 while the synthetic resin 16 is passed through the gap between the carbon fiber wires on the outer periphery of the fiber stranded wire 19. Pressurize more to fill the internal space 3
The inside is filled with a synthetic resin.

The synthetic resin material adhering to the outer peripheral surface is scraped off by the molding die 24 while leaving a part.

When the filling of the synthetic resin material is completed, the carbon fiber strand 1 is formed by cooling with a cooling device (not shown).

In the above-described embodiment, an example in which the carbon fiber wire and the carbon fiber strand are performed on different production lines has been described. However, the carbon fiber wire and the carbon fiber strand may be continuously produced on the same production line.

[0038]

As described above, the carbon fiber strand according to the present invention has a margin to extend in the longitudinal direction compared to when twisted without generating voids, in other words, has an allowance for elongation, and when a tensile force is applied. In addition, since the synthetic resin material in the gap between the carbon fiber wires is compressed in the radial direction, the carbon fiber wire is tensioned in the longitudinal direction, and the entire carbon fiber strand can be stretched. It can be used safely as a material, and since it is lightweight, work efficiency such as installation work can be improved, and work costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a carbon fiber strand according to the present invention.

FIG. 2 is a longitudinal sectional view showing a carbon fiber wire according to the present invention.

FIG. 3 is a block diagram showing an outline of a carbon fiber wire manufacturing apparatus according to the present invention.

4 is a longitudinal sectional view showing the crosshead type extruder in FIG. 3. FIG.

FIG. 5 is a longitudinal sectional view showing a fiber assembly wire.

FIG. 6 is a block diagram showing an outline of a carbon fiber strand production apparatus according to the present invention.

7 is a longitudinal sectional view showing the crosshead type extruder in FIG. 6. FIG.

FIG. 8 is a longitudinal sectional view showing a fiber stranded wire.

[Explanation of symbols]

1 Carbon fiber strand 2 Carbon fiber wire 3 gap 4 Synthetic resin materials 5 Carbon fiber 6 gap 7 Synthetic resin materials 8 Twisting machine 9 Preheater 10 Crosshead type extrusion molding machine 11 Fiber assembly wire 12 Molding machine body 13 Auxiliary pressurized tank 14 Molding dies 15 Heater 16 Synthetic resin 17 rolls 18 Twisting machine 19 Fiber twisted wire 20 Crosshead type extrusion molding machine 21 Preheater 22 Molding machine body 23 Auxiliary pressurized tank 24 Molding dies 25 Heating machine

──────────────────────────────────────────────────── ─── Continued from the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) D07B 1/00-9/00 E04C 5/08-5/10 E04G 21/12

Claims (4)

(57) [Claims] 1. A large number of carbon fibers are twisted so as to form voids between the carbon fibers, the internal voids between the carbon fibers are filled with a synthetic resin material, and the carbon fibers are bonded with the synthetic resin material . Multiple said cars
In the Bon fiber wire, there is a gap between each carbon fiber wire.
The internal gaps between the carbon fiber wires
Is filled with synthetic resin material and the synthetic resin material
The carbon fiber wire is bonded.
Carbon fiber strand . 2. The carbon fiber strand according to claim 1, wherein the synthetic resin material is a thermoplastic resin such as polyethylene, nylon or saturated polyester. 3. The carbon fiber strand according to claim 1, wherein the synthetic resin material is a heat resistant polymer material such as a fluororesin, an aromatic polyamide or an aromatic polyimide. 4. A large number of carbon fibers are interposed between the carbon fibers.
Fiber assembly wire is formed by twisting together to create voids
The fiber assembly wire is passed through a crosshead type extruder.
And inside each carbon fiber from the gap between each carbon fiber
By filling the gap with synthetic resin under pressure, carbon fibers
A fiber is formed, and a plurality of the carbon fiber wires are
-Twist so that voids are created between the bon fiber wires
Form a weft wire, and cross-head extrusion of the fiber strand
Through the machine and through the gaps between the fiber wires.
A car characterized by pressure filling a gap with synthetic resin
A method for producing Bonn fiber strands .