JPH0839680A - Manufacture of linear fiber-reinforced plastic/and manufacture of fiber-reinforced plastic cable - Google Patents

Abstract

PURPOSE:To obtain not only a linear fiber-reinforced plastic having a circular section by one process but also a combined twisted fiber-reinforced plastic cable by one process by pluralizing the method, by a method wherein after a reinforced fiber yarn line is impregnated with resin, softening and hardening of the resin are performed on a twisting side while twisting temporarily. CONSTITUTION:A substantially nontwisted reinforced fiber yarn line 1 is impregnated with reinforcing resin at a resin impregnating part 2 and becomes a resin impregnated yarn line 3. Thermosetting or photosetting resin are used for the reinforcing resin. It is preferable that the resin impregnated yarn line 3 is made to pass through a die 4 because of a quantity of the resin and control of a form of a yarn line matter. A resin impregnated yarn line 5 passed through the die 4 is twisted by a twisting device 6. Then a heating furnace 7 and cooling device performing resin softening and resin hardening are provided on a twisting side of a temporary twisting device 6 and resin softening and resin hardening are performed while imparting the temporary twisting. Hereby, twisted and hardened yarn line 8 whose circular section is kept on by the twisting at a twisting side in the vicinity of the temporary twisting device 6 is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a fiber-reinforced linear plastic having a circular cross section and a method for producing a fiber-reinforced plastic cable using the same.

[0002]

2. Description of the Related Art Conventionally, there is a linear FRP having a circular cross section as one of fiber reinforced plastic (hereinafter referred to as FRP) products obtained by impregnating reinforcing fibers with a resin. As a conventional technique for obtaining a linear FRP having such a circular cross section,
(1) A method in which a reinforced yarn impregnated with a thermosetting resin or a thermoplastic resin is pultrusion-molded with a circular die or a circular die,
(2) A method in which a reinforced yarn impregnated with resin is twisted and cured as it is, (3) A yarn or tape-like material is tightly wound around the outer periphery of the reinforced yarn impregnated with resin, and a circular shape is formed. There is a method of obtaining a cross section.

[0003]

The present invention is essentially based on the twisting method of the above (2), but in order to obtain a circular cross section by the conventional twisting method, first, a reinforcing yarn is formed. A method of impregnating with a resin (in this case, a thermosetting resin is generally used in consideration of lowering the rigidity of the resin-impregnated material of the reinforcing yarn). Is adopted. However, in this case, two processes of impregnation-twisting are necessary, and it is necessary to twist the uncured resin-impregnated material of the reinforced reinforced yarn.

Further, when the linear FRP thus obtained is twisted and twisted to obtain an FRP cable, the cured linear FRP having a circular cross section is further twisted and then twisted to obtain a cable. Was necessary.

The present invention is a novel manufacturing method for obtaining a linear FRP having a circular cross section in one step, and at the same time, an epoch-making method in which a twisted and twisted FPR cable can be obtained in one step by making this method plural. The purpose is to provide a process.

[0006]

The first gist of the present invention is as follows.
A method for producing a linear fiber-reinforced plastic in which a substantially untwisted reinforced fiber yarn is impregnated with a resin, and then the resin is softened and hardened on the twisting side while applying false twisting. After impregnating a substantially untwisted reinforced fiber yarn with resin, softening and curing the resin on the twisting side while applying false twist, draw and twist multiple linear fiber reinforced plastics. It is a method of manufacturing a fiber-reinforced plastic cable that is wound up while being wound.

The reinforcing fiber yarns used in the production of the linear FRP and FRP cables of the present invention need to be substantially untwisted fibers. Although the type thereof is not particularly limited, high strength fibers such as glass fiber, carbon fiber and aramid fiber are preferably used.

The present invention will be described in detail with reference to the drawings. It is the schematic which showed an example of the manufacturing method of the linear FRP of this invention. The substantially untwisted reinforcing fiber yarn 1 is impregnated with the reinforcing resin in the resin impregnation portion 2 to become the resin-impregnated yarn 3. As the reinforcing resin, any resin such as thermosetting resin, thermoplastic resin, photo-curing resin, or electron beam curing resin can be used.
Also, the impregnation method is not particularly limited. Furthermore, it is also possible to obtain a thread impregnated with resin off-line.

The resin-impregnated yarn 3 preferably passes through the die 4 for controlling the resin amount and shape of the yarn but is not essential. When the impregnating reinforcing resin is a thermoplastic resin, the die 4 needs to be naturally heated.

The resin-impregnated yarn 5 passing through the die 4 is twisted by a false twisting device 6. At this time, when the reinforcing resin impregnated is a thermosetting resin, the twist added by the false twisting device 6 is mainly twisted and impregnated in the vicinity of the die 4 where the resin-impregnated yarn 3 is not yet cured. When the reinforcing resin is a thermoplastic resin, it is mainly twisted in the heating device 7.

As described above, a heating furnace and a cooling device for softening and hardening the resin are provided on the twisting side of the false twisting device 6 (on the left side of the false twisting device 6 in FIG. 1) to soften the resin while applying false twisting.
By carrying out curing, it is possible to obtain a twist-hardened yarn 8 in which the circular cross section is maintained by twisting on the twisting side near the false twisting device 6. Resin softening means lowering the viscosity of a resin by heating in the case of a thermosetting resin, plasticizing by heating in the case of a thermoplastic resin, and resin hardening means curing by heating in the case of a thermosetting resin, or hardening of a thermoplastic resin. Means solidification by cooling.

Further, when the resin is a curable resin by energy other than heat such as photocuring and electron beam curing, a heating device is installed as the resin softening part and a light irradiation and electron beam irradiation curing device is installed as the resin curing part. Can be achieved.

The simplest method of the false twisting apparatus used in the present invention is to provide a plurality of freely rotating rolls 62 inside a cylinder 61 as shown in FIG. The false twisting device can be configured by rotating the cylinder 61 together with the roll 62, but the present invention is not limited to the false twisting method and device.

In FIG. 1, the right side of the twisting device 6 is an untwisting part, and when the twist-cured yarn 8 is taken from left to right at a constant speed, the twist-cured yarn 8 is twisted. After passing 6, the number of twists becomes substantially zero, but since it was cured in the false twist state on the twisting side, the number of twists on the untwisting side is virtually zero, but it corresponds to twisting and hardening. Only the twisting torque remains. Thereafter, the twist-cured cured yarn 9 with the twisting torque remaining can be passed through a surface coating die 10 as required to obtain a coated linear FRP.

The linear FRP 11 thus obtained is wound on the winding bobbin 12, and the wound linear FR is
P11 has substantially zero twist and has a twist torque corresponding to twisting and hardening.

The advantage of the method for producing a linear FRP of the present invention described in detail above is that it is possible to impregnate a substantially non-twisted reinforcing yarn into a resin in a non-twisted state (resin of a twisted yarn). Impregnation is extremely difficult). By continuously performing false twisting, it is possible to maintain the circular cross section of the yarn on the twisted side, promote resin impregnation by twisting, and achieve close packing of reinforcing fibers. Further, it is possible to continuously obtain a cured yarn having a twisting torque in one step while maintaining a circular cross-sectional shape on the untwisting side, and in particular, a non-twisted linear FR having a twisting torque.
Obtaining P is an extremely rational manufacturing method because there is an advantage that the lower twisting and twisting is not necessary when the P is made into a plurality to form an FRP cable.

Next, a method of manufacturing the FRP cable of the present invention will be described in detail with reference to the drawings. FIG. 3 is a schematic diagram showing a method for manufacturing the FRP cable of the present invention. A plurality of substantially non-twisted reinforced fiber yarns (which may be in a state in which each yarn is mixed) 1 are separately guided to a false twisting device 6 via a resin impregnated portion 2 and a die 4, and they are the same. The false twist number of the condition is given. The obtained linear FRP 11 which is untwisted and has a residual twisting torque is wound on the twisting and winding bobbin 15 after its relative position is controlled by the guide plate 13.

At this time, the twisting and winding bobbin 15 is rotated in the direction of arrow C at the same time as the twisting and winding bobbin 15 is rotated in the direction of arrow B to perform twisting corresponding to the elimination of the twisting torque of the plurality of linear FRPs. Thus, the FRP cable 14 can be obtained on the twisting and winding bobbin 15. At this time, the surface coating die shown by 10 in FIG.
It is also possible to reduce the internal friction between the strands of the FRP cable or wear after the assembly (not shown).

In the structure of the FRP cable obtained by the method of the present invention, the conventional cable has two twist structures of the lower twist and the upper twist, whereas the cable obtained by the method of the present invention has only the upper twist structure. is there.

In a linear FRP or FRP cable, the strength utilization factor is generally lowered by twisting, but the linear FRP of the present invention does not have a twist in the strand, so the strength utilization factor is reduced. There is an advantage that it can be improved.

[0021]

EXAMPLES The method of the present invention will be described in more detail below with reference to examples. As shown in FIG. 4, 0.
A carbon fiber tow (three pieces) having a basis weight of 8 g was continuously immersed in a resin impregnated portion 2 containing an epoxy resin in a separated state, and then, a die having three concentric circles each having a diameter of about 1 mm. Pass through 4 and then combine 3 tows,
It was led to the false twisting device 6 through a die guide 4'having a diameter of about 1.7 mm and a heating part 7 having a furnace length of 5 m.

A cooling unit (not shown) was provided between the heating device and the false twisting device to stabilize the nip portion of the false twisting device. 7 sets of this system are arranged in parallel, and the linear FRP 16 having a diameter of 1.7 mm is continuously manufactured at the same time at the same time with the tow moving speed of 2.5 m / min and the false twisting device rotating at 50 rpm. Subsequently, as shown in FIG. 5, the position is controlled by the guide plate 13 having six guides on a concentric circle and one guide at the center, and then the twisting and winding bobbin 15 is moved for 25 minutes for one minute.
Approximately 5 in diameter on the winding bobbin while rotating (rotating in the B direction)
The FRP cable 17 was obtained 10 times per mm and the number of twists of 1 m.

[0023]

According to the present invention constructed as described above,
Conventionally, two processes of impregnation-twisting were required, but the production of the linear FRP is completed in one step, and since the linear FRP obtained by the method of the present invention has no twist, the strength utilization ratio of the conventional method is increased. It can be improved compared to the linear FRP. In addition, the FRP obtained by the production method of the present invention
Since the cable has only the twisted structure, it is possible to improve the strength utilization ratio as compared with the conventional FRP cable.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a method for producing a linear FRP of the present invention.

FIG. 2 is a cross-sectional view showing an example of a false twisting device.

FIG. 3 is a schematic view showing an example of a method for manufacturing the FRP cable of the present invention.

FIG. 4 is a schematic view mainly on a twisting side for obtaining one linear FRP using a plurality of (three) tows.

FIG. 5 is a schematic view of a guide portion for stabilizing a twisting portion for obtaining an FRP cable from seven linear FRPs.

[Explanation of symbols]

1 Reinforcing fiber yarn (substantially untwisted) 2 Resin impregnated portion 3 Resin impregnated yarn 4 Dice 5 Resin impregnated yarn (after passing through the die) 6 False twisting device 61 Cylinder 62 constituting false twisting device Constituent rolls 7 Heating device 8 Circular cross-section twist-cured yarns 9 Circular cross-section untwisted cured yarns (remaining twisting torque) 10 Die coating device for surface coating 11 Wire FRP 12 Winding bobbin 13 Guide plate 14 FRP cable 15 Twisting and winding bobbin 16 Linear FRP (consisting of 3 carbon fiber tows) 17 FRP cable (consisting of linear FRP 16 × 3)

Claims (2)

[Claims] 1. A method for producing a linear fiber reinforced plastic, which comprises impregnating a substantially untwisted reinforced fiber yarn with a resin and then softening and curing the resin on the twisting side while applying false twist. 2. A plurality of linear fiber reinforced plastics obtained by impregnating a substantially untwisted reinforced fiber yarn with a resin and then softening and curing the resin on the twisting side while applying false twist. A method for manufacturing a fiber-reinforced plastic cable that is wound while being aligned and twisted.