JPH09105086A - Covered fiver-reinforced resin strand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a covered fiber-reinforced resin strand excellent in flexibility and strong durability and suitable for a fiber-reinforced resin cable by covering a strand with a covering material in a non-adhesive state. SOLUTION: Element filaments 1-1, 1-2, 1-3, 1-4, 1-5, 1-6 and 1-7 comprising reinforcing fibers such as glass fibers or carbon fibers are twisted and sized, and subsequently covered with a substantially non-adhesive resin such as polypropylene or polyethylene as a covering material 2 in a non-adhered state to produce the fiber-reinforced resin strand 3 having a circular cross section. When a plurality of the strands are twisted and sized, the strands may be twisted so as to form a polygonal cross section wherein the strands contact with each other in a surface contact state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a fiber reinforced resin strand (hereinafter FR) for obtaining a fiber reinforced resin cable (hereinafter referred to as FRP cable) having excellent flexibility and durability.
P strand).

[0002]

2. Description of the Related Art FRP cables are obtained by twisting and bundling a plurality of FRP strands, and further FRP strands are obtained by twisting and bundling a plurality of fiber-reinforced resin wires (hereinafter referred to as FRP wires). FR by twisting and focusing FRP strands
When the P-strand is used, each FRP element wire makes a linear contact and can disperse the contact pressure.
When a plurality of strands are twisted and bundled to form an FRP cable, the contact state between the FRP strands becomes point contact, and high pressure is generated at the contact points, which causes deterioration of strength and durability of the FRP cable. . Therefore, when the linear fiber reinforced resin having high strength is used, there are many problems in adopting the cable structure, and conventionally, the strand structure has been used. However, the linear fiber reinforced resin has high rigidity, and if the diameter of the FRP wire is increased, it becomes a rigid linear material that cannot be wound, and the diameter of the FRP wire that can be handled is limited. This means that when an FRP strand having a large cross-sectional area is required, a large number of FRP strands are required, and there has been a problem in obtaining an FRP strand having a large cross-sectional area in the related art. On the other hand, in the process of FRP strand-FRP strand-FRP cable, since focusing is repeated in each process, it is possible to obtain a linear object with a large cross-sectional area from a small diameter FRP strand, and it is also excellent in flexibility. However, as described above, there were problems in strength reduction and durability due to point contact.

[0003]

SUMMARY OF THE INVENTION The present invention is an FRP for obtaining an FRP cable having excellent flexibility and strong durability.
The challenge is to provide strands.

[0004]

DISCLOSURE OF THE INVENTION The present invention relates to a fiber-reinforced resin strand coated with a coating material, wherein the coating material and the fiber-reinforced resin strand are in a non-adhesive state. The above problem is solved by the strand.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of the coated FRP strand of the present invention, which is a coated FRP strand 3 of the present invention.
The basic requirement is that the FRP strands obtained by twisting and focusing the FRP strands (1-1) to (1-7) and the covering material 2 are in a non-adhesive state.

To obtain FRP strands from FRP strands, for example, FRP strands of the same diameter or non-same diameter FRP strands adjusted to maintain the circular shape of the FRP strands, 7.19.37.61. Generally, twisting and focusing are performed according to a sequence of books, but FR used in the present invention
The number of strands of the P strand is not particularly limited.

Fibers having high strength and elasticity such as glass fiber and carbon fiber are used as the reinforcing fiber as a material for forming the FRP strand. As the matrix resin, a thermosetting resin such as epoxy or phenol resin, or a thermoplastic resin such as nylon or polycarbonate is used in accordance with the principle of FRP production, but the kind or the like is not particularly limited.

The diameter of the FRP wire is not particularly limited, but is 3 when the flexibility of the FRP strand is important.
It is preferably about mm or less.

A thermoplastic resin such as polypropylene, polyethylene or nylon is mainly used as the coating material 2 which is another constituent element of the coated FRP strand of the present invention, but a thermosetting resin such as epoxy or phenol resin is also used. Can be used for. However, in any case, it is preferable that the resin has a high compressive strength and is high in rigidity and rigidity within a range where the flexibility of the strand is allowed.
Therefore, a resin reinforced with milled fibers is also an effective coating material.

One of the methods for obtaining the structure in which the twisted and bundled FRP strands and the covering material 2 are not in contact with each other using the covering material 2 shown above is difficult as in the case of polypropylene, polyethylene and the like. Adhesive resin is used as a coating material, and the FRP strand is coated with a film or paper and then coated with polypropylene, nylon resin, or the like, and the release agent or grease is not adhered to the surface of the FRP strand. By coating after applying the substance, a coated FRP strand in a non-adhesive state can be obtained. It is preferable that the coating material is on the outer periphery of the FRP strand and is not present in the center of the FRP strand.
Although effective for the flexibility of the P-cable, such a configuration is possible by adjusting the coating viscosity of the coating material.

The thickness of the covering material is 0.
It is preferably 1 mm or more, but is not particularly limited. In addition, as described above, it is possible to mix milled fibers or an anti-friction agent into the coating material, if necessary. The coated FRP strand of the present invention thus obtained has good flexibility and enables a winding package.

The coated FRP strand 3 of the present invention can be further twisted and bundled into the FRP cable 4 shown in FIG. In such an FRP cable, the coated FRP strands constituting the FRP cable are circular, and the strands are in line contact with each other, so that the contact pressure can be reduced.

On the other hand, the covering material is simply coated with the covering material and the covering material is FRP.
When bonded to the strands, especially for highly rigid coatings,
The coated strands are stiff and there is damage to the coating. Further, the FRP strand or the FRP strand in which carbon fiber is a reinforcing component causes a slight deterioration in the surface, but the coated FRP strand of the present invention can be expected to have an additional effect that the coating material serves as a protective layer.

In the coated FRP strand of the present invention, when the surface shape of the coating material (hereinafter referred to as a twisted shape) is a twisted polygon as described below, surface contact can be obtained and the contact pressure can be further reduced. It will be possible. FIG. 3 is a conceptual diagram of a screw shape, showing one cycle of the screw. A ridge P (indicated by a black dot) of a polygon (in this case, a hexagon, the shape of the polygon is limited by the focusing method of the FRP strands; therefore, the structure of the present invention is not limited to the hexagon) is long. It is a structure that rotates with respect to the direction, and the number of rotations per unit length is set by the configuration of the cable. For example, as shown in FIG.
When the cable 5 is obtained by using 19 P strands (6-1) to (6-3), the number of screw rotations per unit length is 6
It is necessary to decrease in the order of -1, 6-2, 6-3, and specifically, it is set depending on the size of the strand and the method of focusing the strand.

The twisting speed of the polygonal shape is set regardless of the twisting direction and the twisting number of the strand obtained by twisting and converging the FRP strand. (In Figure 3, the strand is 1/2
This shows the case of rotation. )

Such a polygonal twist structure can be manufactured by rotating a polygonal die in the process of processing the covering material on the FRP strand.
It is also possible to twist and focus the circularly-coated FRP strand in a state where the coating material is plasticized to form a polygonal shape as shown in FIG.

When the surface shape of the coating material described in detail above is a twisted polygonal shape, the FRP strands come into surface contact with the adjacent strands, and the contact pressure can be further reduced.

[0018]

The present invention will be described more specifically with reference to the following examples.

Example 1 Carbon fiber (CF) tow (3.
28 g / m) containing epoxy resin, and a CFRP wire rod having a diameter of about 1.9 mm is formed by a pultrusion method, and 19 pieces of 1 m
CFRP of about 9.5 mm in diameter with 2.3 twists
Strands were formed. Then, using a coating die having a diameter of 10 mm, the outer circumference of the CFRP strand was coated with polypropylene as a coating material to obtain a coated CFRP strand having a circular cross section with polypropylene as the coating material. Although the obtained coated CFRP strand was slightly inferior in flexibility to the uncoated CFRP strand, the CFRP cable obtained by twisting seven coated CFRP strands was in a line contact state and had a diameter of 2 m. Could be wound into a coil.

(Example 2) The CFRP strand obtained in Example 1 was twisted into a hexagonal cross section having a polypropylene resin as a coating material using a regular hexagonal rotating coating die (hexagonal opposite side dimension 10 mm). A coated CFRP strand was formed. At this time, one coated CFRP strand with a twisting number of 1.750 times / m and six coated CFRP strands with a twisting number of 1.749 times / m were produced to give 1.750 times / m.
The coated CFRP strand is placed at the center, and the coating C is applied at 1.749 times / m so that the hexagonal surfaces are closely attached to each other.
C with the number of twists of 1.750 t / m in which the FRP strand is arranged
I got an FRP cable. The CFRP cable obtained is
All the adjacent CFRP strands were in surface contact with each other and could be wound into a coil having a diameter of 2 m.

[0021]

The coating F of the present invention constructed as described above
By using the RP strand, it is possible to obtain an FRP cable excellent in flexibility and strong durability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a coated FRP strand of the present invention.

FIG. 2 is a cross-sectional view of an FRP cable obtained by twisting and bundling seven coated FRP strands.

FIG. 3 is an external view (top) corresponding to one cycle of a coated FRP strand having a twisted polygonal cross section, and cross-sectional views (bottom) at respective positions in the longitudinal direction.

FIG. 4 is a cross-sectional view of an FRP cable obtained by twisting and focusing 19 coated FRP strands having a twisted polygonal cross section.

FIG. 5 is a cross-sectional view showing another example of an FRP cable including a covered FRP strand having a twisted polygonal cross section.

[Explanation of symbols]

1-1 to 1-7 FRP strand 2 coating material 3 coating FRP strand 4 coating FRP cable 5 cable consisting of twisted polygonal coated strands 6-1 to 6-3 twisted polygonal coated strands P twisted Polygonal ridge

Claims (3)

[Claims] 1. A fiber-reinforced resin strand coated with a coating material, wherein the coating material and the fiber-reinforced resin strand are in a non-bonded state. 2. The coated fiber-reinforced resin strand according to claim 1, wherein the coated fiber-reinforced resin strand has a circular cross section. 3. The cross section of the coated fiber-reinforced resin strand comprises:
The coated fiber-reinforced resin strand according to claim 1, wherein the coated fiber-reinforced resin strand has a polygonal cross section that is twisted so as to be in surface contact when a plurality of the coated fiber-reinforced resin strands are twisted and bundled.