JP2000272021A - Mold for producing frp filament and manufacture of frp fine filament - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold for producing FRP filaments in which resin- impregnated fibers can be molded and cured easily, the surface properties of the fibers are good, and shapes are possible in the continuous production of the filaments by a pultrusion method and a method for producing the filaments. SOLUTION: In a method for producing FRP filaments continuously in which fibers are impregnated with a resin liquid, the rein-impregnated fibers are introduced into a mold D, the resin is cured in the mold and/or after passage through the mold, the mold D comprises plate-shaped molds 2-5 mm in thickness and is composed of a group of the plate-shaped molds in which they are connected together so that cavities formed in them communicate with each other, a tapered opening part is formed on the side of an introduction port for the fibers in each plate-shaped mold, and the opening part is connected to the cavity of the plate-shaped mold.

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 an FRP (fiber reinforced resin) fine filament, and more particularly, to a mold and a FRP for producing an FRP fine filament which can be used as a tension member of an optical fiber cable. The present invention relates to a method for manufacturing a thin filament.

[0002]

2. Description of the Related Art FRP thin filaments are used as tension members for optical fiber cables and various reinforcing materials because of their characteristics such as non-electric conductivity, light weight, high strength, and high elastic recovery. In addition, a material having high shape accuracy is required.

[0003] As a method of continuously producing an FRP filament, a fiber is impregnated with a curable resin, and then the fiber impregnated with the curable resin is drawn and molded by a mold. A pultrusion method for curing the impregnated fibers (for example, heat curing, ultraviolet curing, etc.) is generally used. FIG. 10 shows an apparatus for manufacturing an FRP striatum by the pultrusion method. This manufacturing apparatus is equipped with a creel stand 1
And a thread supply means comprising a tension applying device 2 and a guide plate 3, a resin impregnation tank 4, a mold 17, an ultraviolet irradiation device 6, and a FRP fine wire comprising a take-up machine 8 and a take-up spool 9. And a strip winding means.

[0004] In the resin impregnation tank 4, the fiber F is spread by a spreader 5 under a predetermined tension, and after the fiber F is impregnated with a resin liquid (ultraviolet curable resin liquid), it is impregnated with gold. It is led to the mold 17. The resin-impregnated fiber is filled at the mold entrance 17 after excess resin is squeezed out.
And shaped into a predetermined shape. The molded resin-impregnated fiber is cured through an ultraviolet irradiation device 6, and is taken up by a take-up spool 9 via a guide roller 7 and a take-up machine 8.
It is wound up. The curing of the resin-impregnated fibers is performed by passing ultraviolet rays from the ultraviolet lamp 11 at the same time as passing through the slit of the ultraviolet shielding plate 10 disposed immediately after the exit of the mold 17. At this time, a predetermined tension is applied to the molded resin-impregnated fiber by the mold 17 and the guide roller 7, so that vibration and loosening do not occur during the curing reaction.

However, in this method, it has been difficult to accurately form and harden the shape of the FRP fine filament having a diameter of 1 mm or less. This is because a mold must have a sufficient cavity length in order to accurately and shape the shape of the resin-impregnated fiber molded body, but it is difficult to manufacture a mold having a small-diameter cavity. is there. Furthermore, in a mold having a small cavity diameter and a long cavity length, it is difficult to first pass the resin-impregnated fiber because the contact resistance between the resin-impregnated fiber and the cavity is large. There is a problem that it takes a lot of time to prepare the process.

To solve such a problem, FIG.
The upper die 18a as shown in FIG.
It has been proposed to use a split die 18 having a length of about 5 to 50 mm, which is a combination of a split die 18 and a lower die 18b. With this split mold, a sufficient cavity length for shaping the resin-impregnated fibers can be obtained. When assembling the split mold, it is possible to pass resin-impregnated fibers through the cavity of the split mold. However, when the resin-impregnated fiber is molded using this split mold, there are problems such as traces of the mold remaining on the molded body, and dimensional accuracy and roundness of the molded body are reduced if the fitting accuracy of the mold is poor. .

[0007] For this reason, as a method of manufacturing a FRP fine filament, (a) a method of providing an auxiliary die in front of a molding die (die) and squeezing out the excess resin of the ultraviolet curable resin-impregnated fiber (Japanese Patent Laid-Open No. Sho 62) (B) a method of introducing ultraviolet transmitting fibers impregnated with an ultraviolet curable resin into a plurality of molds (molds), and irradiating ultraviolet rays between and / or within the molds to cure them ( JP 6
(C) A method in which ultraviolet-curable resin-impregnated fibers are molded by a plurality of drawing nozzles (die), and the molded ultraviolet-curable resin-impregnated fibers are cured by irradiating ultraviolet rays (Japanese Unexamined Patent Application Publication No. 4-108132) has been proposed.

In the method (a), an auxiliary die is provided in front of the molding die to squeeze out excess resin of the ultraviolet-curable resin-impregnated fiber, thereby suppressing gelling of the resin in the resin pool of the molding die. Thus, an increase in the pulling tension of the FRP filament can be prevented to produce a thin FRP filament. However, in this method, since a sufficient cavity length cannot be provided in the die, there is a problem that it is difficult to form the shape of the molded body with high accuracy.

In the embodiment of the method (b), a plurality of metal molds (mold length: 5 mm, mold gap:
It is disclosed that the resin of the resin-impregnated fiber is cured between the molds by ultraviolet rays.
And using multiple molds with short lengths in multiple stages,
It is described that the contact resistance between the mold and the fiber can be reduced to obtain a smooth molded body having a good appearance and a smooth surface. However, this method mainly cures the resin between the molds, so that it is necessary to control the degree of resin curing stepwise, and this control becomes complicated. Furthermore, since the length of the mold is short, large springback is likely to occur in the fibers immediately after molding. In addition to this, at the time of curing, the mold gap is wide, so that springback may occur in the fiber, and as a result, there is a problem that fiber fluffing occurs and impairs the surface condition of the FRP fine filament.

The method (c) is to obtain a fine FRP filament having a good shape by rapidly curing the molded ultraviolet-curable resin-impregnated fiber by irradiation with ultraviolet light in a non-contact state. However, in this method, since the drawing distance required for shaping the drawing nozzle is short, the springback of the fiber immediately after the nozzle becomes large, and a formed body having a loose fiber tension is formed. May not be maintained sufficiently, or the molded article may have fiber fluff. As a result, there is a problem that the shape (cross-sectional dimension, roundness, etc.) of the manufactured FRP fine filaments deteriorates and the surface condition is impaired.

[0011]

Accordingly, the present invention relates to an FR
In the continuous production of P fine filaments by the pultrusion method, molding of the resin-impregnated fiber and subsequent curing of the fiber can be facilitated, and the resin-impregnated fiber has a good surface property and a good shape (cross-sectional dimension and perfect circle). It is an object of the present invention to provide a mold for manufacturing an FRP fine filament that can accurately shape the FRP filament. And, using this mold,
FR that can accurately obtain the shape of FRP fine filaments
It is an object of the present invention to provide a method for producing a fine P filamentous body.

[0012]

Means for Solving the Problems To achieve the above-mentioned object, a mold for producing an FRP fine filament according to the present invention comprises impregnating a fiber with a resin solution and introducing the resin-impregnated fiber into the mold. A method for continuously manufacturing the FRP fine filament while curing the resin in the mold and / or after passing through the mold, wherein the mold has a thickness of 2 mm to 5 mm; And a plate-shaped mold group configured to connect these plate-shaped dies so that the cavities provided in these plate-shaped dies communicate with each other. A tapered opening is provided on the resin-impregnated fiber introduction port side, and the opening is connected to a cavity of a plate-shaped mold (the invention according to claim 1).

[0013] The mold for producing the FRP fine filament of the present invention comprises:
A plate-shaped metal having a plurality of plate-shaped dies having a thickness in the range of 2 mm to 5 mm, and connecting these plate-shaped dies such that cavities provided in these plate-shaped dies communicate with each other. By forming the mold group, a cavity length effective for shaping the resin-impregnated fibers is formed. At this time, in order to shape the resin-impregnated fibers with each plate mold, the thickness of the plate mold needs to be 2 mm or more. And by making the thickness of the plate-shaped mold 5 mm or less,
It is possible to easily manufacture a plate-shaped mold having good cavity accuracy. Further, the thickness of the plate mold is set to 5 mm.
By doing so, the resin-impregnated fiber can be easily introduced into each plate-shaped mold.

Preferably, the sum of the cavity lengths of the respective plate-shaped dies provided in the plate-shaped die group is in the range of 6 mm to 30 mm (the invention according to claim 2). When the total length of the cavities provided in the plate-shaped mold group is at least 6 mm, more preferably at least 10 mm, a cavity length effective for shaping the resin-impregnated fibers can be obtained. Then, the sum of the cavity lengths provided in the plate-shaped mold group is set to 30.
When the diameter is equal to or less than mm, disconnection of the fiber due to an increase in contact resistance between the cavity and the resin-impregnated fiber can be prevented.

Further, by providing a tapered opening on the inlet side of the resin-impregnated fiber of each plate-shaped mold of the plate-shaped mold group, the resin-impregnated fiber can be more easily applied to each plate-shaped mold. In addition, the resin-impregnated fibers can be smoothly introduced into the cavity by connecting these openings to the cavity of the plate-shaped mold. At this time, the taper of the opening may be a straight line or a curved line.

[0016] The length of the opening provided in the plate-shaped mold provided in the mold for manufacturing the FRP fine filament of the present invention is 0.3 m.
m to 1 mm, and the opening angle of the opening is 60
It is preferable that the angle is from 140 to 140 (the invention according to claim 3). In order to easily introduce the resin-impregnated fiber into the plate-shaped mold, the length of the opening provided in the plate-shaped mold needs to be 0.3 mm or more, and the opening angle of the opening is 60 ° to 1 °.
Preferably it is 40 °. On the other hand, when the length of the opening is increased, the effective cavity length for shaping the resin-impregnated fiber is reduced. Therefore, the length of the opening is preferably 1 mm or less. Furthermore, when a gap is provided between the plate-shaped molds described below (claim 6), the length of the opening is set to 1 mm or less in order to maintain the resin amount of the resin-impregnated fibers. There is a need. When the length of the opening exceeds 1 mm, the resin-impregnated fiber is excessively squeezed at the opening, and the resin in the resin-impregnated fiber is squeezed out, so that the resin amount of the resin-impregnated fiber can be maintained. Because it is gone. If the resin content of the resin-impregnated fibers cannot be maintained, the accuracy of the cross-sectional dimensions of the FRP fine filaments will be reduced.

In order to increase the effective cavity length for shaping the resin-impregnated fibers, in the plate-shaped mold group, the plate-shaped molds at the front end of each of the connecting portions are provided with the plate-impregnated fibers at the outlet side. It is preferable to provide a projection that fits into the taper of the opening of the plate mold at the subsequent stage of the mold, and provide a cavity in the projection (the invention according to claim 4). At the exit side of the plate-shaped mold, a projection having the same shape as the opening of the plate-shaped mold at the subsequent stage of the plate-shaped mold is provided. By fitting the opening of the mold and the convex part,
An extra space is eliminated, and the cavity length effective for shaping the resin-impregnated fibers can be increased. Further, the convex portions facilitate positioning of each plate-shaped mold, and maintain straightness of a cavity provided in the plate-shaped mold.

Further, in the metal mold for manufacturing the FRP fine filament strip according to the present invention, a plurality of guide holes are provided in each of the plate-shaped dies so as to communicate with the plate-shaped mold group. It is preferable that a guide rod communicating with the mold group is inserted, and each of the plate-shaped dies is configured to be movable by being guided by the guide rod (the invention according to claim 5). The positioning of each plate mold can be easily performed by this guide rod, and the straightness of the cavity provided in the plate mold is maintained. Further, since each of the plate-shaped molds is configured to be movable, the resin-impregnated fibers are passed through the cavities of the plate-shaped molds in advance, and these plate-shaped molds are connected to each other.
It is possible to assemble a metal mold for manufacturing a P fine filament.
Since each plate mold has a thickness of 5 mm or less and an opening, it is easy to pass the resin-impregnated fiber through the cavity of each plate mold. Preparation does not take much time. In addition to this,
Since each of the plate-shaped dies is configured to be movable, rearrangement and extension of the arrangement of the plate-shaped dies can be easily performed.

In the metal mold for manufacturing a FRP fine filament strip according to the present invention, a gap can be provided between the metal molds of the group of connected metal molds. It is more preferably 5 mm or less (the invention according to claim 6). By providing a gap between the plate-shaped mold and the plate-shaped mold, the continuous cavity length through the opening can be shortened, so that the resistance of the resin-impregnated fiber in the mold can be reduced. In addition, disconnection of the fiber can be prevented. The reason for this is that as the length of the continuous cavity becomes longer, the resistance of the resin-impregnated fiber to the take-up in the mold increases rapidly.

The reason for limiting the distance of the gap between the plate-shaped molds is as follows. As described in the above-mentioned conventional technique, if the gap between the plate-shaped mold and the plate-shaped mold is large, springback occurs in the molded resin-impregnated fiber at the gap, and the generated springback amount Also increases. When the amount of springback also becomes large, as described above, a molded product having a loose fiber tension is formed, whereby the shape of the molded product is not sufficiently maintained, and fibers are formed on the molded product. In order to reduce the amount of springback, a gap between the plate-shaped mold and the plate-shaped
mm or less, preferably 5 mm or less. Furthermore, in order to maintain the resin amount of the resin-impregnated fiber,
The gap between the plate molds is 10 mm or less, preferably 5 mm
Do the following. By suppressing the exudation of the resin from the resin-impregnated fibers in the gap between the plate-shaped molds, it is possible to prevent the resin that has exuded from the resin-impregnated fibers from being squeezed out at the opening of the next plate-shaped mold. . As described above, since the resin amount of the resin-impregnated fiber can be maintained, the shape of the molded article of the resin-impregnated fiber can be accurately formed.

The gap between the plate molds is preferably formed by providing a spacer between the plate molds (claim 7). invention). By positioning each plate mold by the spacer, a gap between each plate mold can be easily formed, and the straightness of the cavity provided in the plate mold can be maintained.

Further, it is preferable that a hollow portion through which the resin-impregnated fiber passes is provided in the spacer, and the resin liquid is held in the hollow portion (the invention according to claim 8). By holding the resin liquid in the hollow portion, it is possible to prevent the resin from oozing out of the resin-impregnated fibers in the gap between the plate-shaped dies, and to maintain the resin amount of the resin-impregnated fibers.

As the resin material used for the FRP fine filament produced by the mold for producing the FRP fine filament of the present invention, any resin which is usually used in the pultrusion method can be applied. For example, unsaturated polyester resin,
A vinyl ester resin, an epoxy resin, a phenol resin, or the like can be used. Means for curing these resins include, in addition to the resin curing technique using ultraviolet rays,
The resin can be heated and cured while the plate-like mold of the mold for producing the RP fine filament is directly or indirectly heated and the resin-impregnated fiber passes through the cavity of the plate-like mold. Furthermore, the resin can be cured by heating with a far-infrared heater or the like after passing through the mold for manufacturing the FRP fine filaments of the present invention. When such a heat-curable resin is used, the gelling of the resin may increase the resistance of the resin-impregnated fiber to be taken off, and may break the resin-impregnated fiber.

For this reason, it is preferable to use an ultraviolet curable resin as the resin material used for the FRP fine filament manufactured by the mold for producing the FRP fine filament of the present invention (the invention according to claim 9). . By using a resin curing means by ultraviolet rays for the production of FRP fine filaments, it becomes possible to irradiate ultraviolet rays in a non-contact state, and it is possible to rapidly cure,
This is because the cross-sectional dimension and roundness of the FRP fine filament can be obtained with higher accuracy. As the ultraviolet curable resin, an ultraviolet curable resin such as an acrylic resin composition such as epoxy acrylate, urethane acrylate, or polyester acrylate, or a cationic photopolymerizable composition using an alicyclic epoxy or the like can be used.

When a resin curing means using ultraviolet rays is used for manufacturing the FRP fine filament, one or all of the plurality of plate-shaped dies are made of an ultraviolet-permeable material (for example, quartz glass, fluororesin, silicon resin, etc.). ) To cure the resin in the mold cavity (the invention according to claim 10). Since the resin is cured in the mold cavity,
Since the fibers are cured while being shaped, it is expected that the dimensional accuracy will be further improved. In this case, it is conceivable that the resistance of the resin-impregnated fibers to be taken up due to gelling of the resin in the plate-shaped mold is increased. It is preferable to provide That is, by providing a gap between the plate-shaped mold and the plate-shaped mold, by reducing the continuous cavity length, to reduce the take-up resistance of the resin-impregnated fiber in the mold,
Prevents fiber breakage.

[0026] The mold for producing an FRP fine filament of the present invention is most suitable for producing an FRP fine filament having a diameter of 0.1 to 1.0 mm (the invention according to claim 11).

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the method of the present invention will be described below with reference to the drawings. First, an apparatus for manufacturing an FRP fine filament used in an embodiment of the present invention and a mold for manufacturing an FRP fine filament according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic view of an apparatus for producing an FRP fine filament used in an embodiment of the present invention, and FIG. 2 is a plate-like used in a mold for producing an FRP fine filament used in the embodiment of the present invention. It is a figure which shows the detailed shape of a metal mold | die, FIG. A is a side view of a plate-shaped metal mold, FIG. B is a top view of a plate-shaped metal mold.

The apparatus for manufacturing an FRP fine filament used in the embodiment of the present invention (see FIG. 1) is similar to the conventional apparatus for manufacturing a FRP fine filament (see FIG. 10) except that the mold 17 is replaced by a plate-shaped mold group holder. (Mold for manufacturing FRP fine filaments of the present invention) 11. As shown in FIG. 1, the plate-shaped mold group holder 11 is composed of a plate-shaped mold group having a configuration in which ten plate-shaped dies D (D1 to D10) are connected.
In this configuration, the cavities provided in (D1 to D10) communicate with each other.

As shown in FIG. 2, the plate-shaped mold D (D1 to D10) comprises a disk having a diameter of 16 mm and a thickness of 3 mm, and a cavity 14 having a diameter of 0.38 mm is provided in the center of the disk. ing. Further, an opening 16 is provided in the cavity 14 on the side where the resin impregnated resin is introduced.
The opening 16 has a length of 0.5 mm and an opening angle of 90 mm.
It is composed of a cone shape having a linear taper of °. Further, the plate-shaped mold D (D1 to D10) includes:
Guide holes 21 having a diameter of 4 mm are provided at positions above and below the cavity 14 in parallel with the central axis of the cavity 14. In this embodiment, ten plate-shaped dies D (D1 to D10)
Have the same shape. As a result, the cavities provided in these ten plate-shaped dies D (D1 to D10) communicate with each other, and the two guide holes 21 provided in the ten plate-shaped dies D (D1 to D10). Is also connected.

(Example 1) An example of assembling a metal mold for manufacturing an FRP fine filament according to the present invention will be described with reference to FIGS. For the sake of explanation, the figures are exaggerated in shape. FIG. 4 is a view for explaining an example of assembling a mold for producing an FRP fine filament according to claim 1 of the present invention. Less than,
FIG. 5 is a view for explaining an example of assembling a mold for manufacturing an FRP fine filament according to claim 4 of the present invention, FIG. 6 is claim 7 of the present invention, and FIG. 7 is claim 8 of the present invention.

(1) An example of assembling the mold for manufacturing the FRP fine filament according to the first aspect of the present invention (see FIG. 4) The mold for manufacturing the FRP fine filament according to the present invention is as shown in FIG. The plate-shaped dies D are connected so that the cavities 14 provided in the plate-shaped dies D communicate with each other. Then, 2 provided on each plate-shaped mold D
Guide rods 22 are provided in one of the guide holes 21, and these guide rods 22 are configured to communicate with the plate-shaped mold D group.

Next, a method for assembling a mold for producing an FRP fine filament according to the present invention will be described with reference to FIG. Each plate mold D
The fiber F is passed through the cavities 14 of the respective plate-shaped dies D before assembling the dies which can be moved by being guided by the guide rods 22. In this example, since each plate-shaped mold D had a thickness of 3 mm and had an opening 16, the fiber F could be easily passed through the cavity 14 of each plate-shaped mold D. Then, each plate-shaped mold D was moved to the left, and ten plate-shaped molds D were connected as shown in FIG. At this time, the guide rod 22 is fixed to the plate-shaped die group holder 11 shown in FIG. 1 with the guide rod fixing screw 23, and the assembling of the die for manufacturing the FRP fine filament of the present invention is completed. Thus, the time required for preparation of the molding step can be reduced.

(2) Example of assembling a mold for manufacturing a thin FRP filament according to claim 4 of the present invention (when a convex portion is provided on the exit side of the plate-shaped mold) (see FIG. 5) On the outlet side of d1 (on the right side in FIG. 5), a projection 15 having the same shape as the opening 16 of the plate-shaped mold d2 at the subsequent stage of the plate-shaped mold d1 is provided. By connecting each plate-shaped mold, and fitting the opening and the projection of the subsequent plate-shaped mold,
There was no extra space, and the effective cavity length for shaping the resin-impregnated fibers could be increased. Furthermore, the positioning of each plate-shaped mold was facilitated by the projection, and the straightness of the cavity provided in the plate-shaped mold could be maintained. At this time, the length of the projection provided on the exit side of the plate-shaped mold is equal to or shorter than the length of the opening of the subsequent plate-shaped mold.

(3) An example of assembling a mold for manufacturing an FRP fine filament according to claim 7 of the present invention (where a spacer is provided between the plate-shaped dies) (see FIG. 6). As shown in FIG. 6, the mold for producing the FRP fine filament of the present invention is:
(1) In the mold for manufacturing the FRP fine filament, a spacer 24 is provided to provide a gap between the plate molds.
Is used. The spacer 24 is formed of a hollow cylinder. In this embodiment, by setting the length of the cylinder to 2 mm, a gap of 2 mm can be provided between the plate-shaped dies. In the present embodiment, the gaps between the plate-shaped dies D could be easily formed by positioning the plate-shaped dies D using the nine sets of the spacers 24 as described above. The positioning of each plate mold can be accurately performed by the spacers 24, so that the straightness of the cavity provided in the plate mold can be maintained. The assembly of the mold according to the present embodiment is performed by using the guide rod 2 between the plate-shaped mold and the plate-shaped mold.
By arranging the spacers 24 in the second example, it was possible to perform the same operation as in the die assembling example (1).

(4) An example of assembling a mold for manufacturing an FRP fine filament according to claim 8 of the present invention (when a spacer having a hollow portion for holding a resin liquid is provided) (see FIG. 7). A disk-shaped spacer 25 having a hollow portion 26 for holding a resin liquid between the plate-shaped mold D2 and the plate-shaped mold D3.
Is provided. The fiber F is passed through the hollow portion 26 to maintain the resin amount of the resin-impregnated fiber as described above. The spacer 25 has a plate-shaped mold D
Since the guide holes 25a communicating the groups were provided, the mold assembly of the present embodiment could be performed in the same manner as the mold assembly example (1). In the present embodiment, one disk-shaped spacer 25 is provided, but it may be provided between all the plate-shaped dies as in the above-mentioned mold (3).

Next, an embodiment (Example 2 to Example 2) in which an FRP fine filament used for a tension member for an optical fiber cable having a diameter of 0.38 mm was manufactured using the apparatus shown in FIG.
4) and Comparative Examples (Comparative Examples 1 to 3) will be described.
In this example and the comparative example, the fiber F was 33.7 t.
ex glass thread (glass fiber yarn manufactured by Nitto Boseki)
Six were used. Then, these glass threads were fixed to the creel stand 1, and the respective glass threads were passed through the resin impregnation tank 4 via the tension applying device 2 and the guide plate 3. An ultraviolet-curable resin R was used in the resin impregnation tank 4, and the temperature of the resin R was adjusted to about 60 ° C. The ultraviolet-curable resin R is 60 parts of an epoxy acrylate resin (manufactured by Nippon Kayaku Co., Ltd., trade name: KAYARAD), and 1,6-hexanediol diacrylate (manufactured by Nippon Kayaku Co., Ltd .: trade name) as a bifunctional photopolymerizable monomer which is a crosslinking component. K
(S-HDDA) and 3 parts of a photopolymerization initiator (trade name: Darocur 1173, manufactured by Ciba-Geigy). Thereafter, using the resin-impregnated fiber, a molding and curing treatment described below was performed to produce an FRP fine filament.

(Example 2) As described above, the mold for manufacturing the FRP fine filament used in this example is provided on the plate-shaped mold group holder 11 shown in FIG. This is an assembly mold having a structure shown in (1) of Example 1 using ten stainless steel (JIS SUS304) plate-like molds having the shape shown in FIG. The plate-shaped mold D (D1 to D10) has a diameter of 1
It is made of a disk having a thickness of 6 mm and a thickness of 3 mm, and a cavity 14 having a diameter of 0.38 mm is provided in the center of the disk. Further, an opening 16 is provided in the cavity 14 on the side where the resin impregnated resin is introduced. This opening 16
It is composed of a cone having a length of 0.5 mm and a linear taper having an opening angle of 90 °.

In this embodiment, as shown in FIG. 1, resin-impregnated fibers were formed by sequentially passing through plate-like dies D1 to D10 having the same cavity diameter (diameter: 0.38 mm). Then, the molded resin-impregnated fiber purple is passed through an external light irradiation device (manufactured by Fusion, output 300 W / in, one unit) to harden the resin, and the FRP fine filaments manufactured by the guide rollers 7. It was wound on a take-up spool 9 via a take-up machine 8.

As described above, the take-up speed of 20 m / m
In, under a load of 1 kgf of tension, FRP fine filaments were manufactured continuously for about 20 km. At this time, the obtained FRP
The fine striatum has an average diameter of 0.380 mm and a standard deviation of 0.
003 mm, and it was confirmed that the accuracy of the cross-sectional dimension and roundness was excellent. Further, the surface of the obtained FRP fine striated body was observed. The surface of the FRP fine striated body was smooth, and no floating or fluff of the fiber was observed. As described above, since the mold for producing an FRP fine filament according to the present invention has a cavity length (total of the cavity length is 25 mm) sufficient for shaping the resin-impregnated fiber, almost no springback occurs immediately after the molding of the resin-impregnated fiber. Since the molded resin-impregnated fiber does not have any surface and is cured by irradiating ultraviolet rays with a free surface, an FRP fine filament excellent in dimensional accuracy and directional properties is obtained.

The FRP fine filament has a glass fiber volume content of 63%, a Young's modulus of 53 GPa, a minimum bending diameter of 8 mm, sufficient mechanical properties, and a FRP used as a tension member for an optical fiber cable. It was confirmed that it could be practically used as a fine filament.

In the present embodiment, the setup of the production line at the time of producing the FRP filament could be easily performed. The mold for manufacturing the FRP fine filament of the present invention was easy to assemble, and the resin-impregnated fiber was first passed through this mold easily. Then, there was no occurrence of line stoppage due to disconnection or the like during continuous production of the FRP linear body for 20 km.

(Example 3) Using the same manufacturing equipment as in Example 2, an FRP fine filament used for a tension member for an optical fiber cable having a diameter of 0.38 mm was manufactured. The manufacturing conditions different from those in Example 2 were the FRP used in this example.
A spacer is disposed between each of the ten plate-shaped dies as shown in (2) of Example 1 so that the distance between the plate-shaped dies is 2 mm. And a mold for producing an FRP fine filament having a total length of 48 mm.
The spacer used at this time is a hollow cylindrical spacer (material: JIS SUS304) having an outer diameter of 7.5 mm, an inner diameter of 4.4 mm, and a length of 2 mm.

At this time, the obtained FRP fine filament had an average diameter of 0.380 mm and a standard deviation of 0.005 mm, and it was confirmed that the precision of the cross-sectional dimension and the roundness was excellent. Further, the surface of the obtained FRP striatum was observed. As in Example 2, the surface of the FRP fine striatum was smooth, and no floating or fluff of the fiber was observed. It was confirmed that the obtained FRP filament had sufficient mechanical properties as in Example 2, and could be sufficiently used as an FRP filament used for a tension member for an optical fiber cable. As in the case of the second embodiment, the production line can be easily set up at the time of manufacturing the FRP filament, and the line stop due to disconnection or the like does not occur once during the continuous production of the FRP filament for 20 km. Was.

Example 4 In this example, the same manufacturing equipment as in Example 2 was used, and as shown in FIG. 3, resin-impregnated fibers were introduced into a mold for manufacturing FRP fine filaments of this example. In this method, the FRP fine filaments are continuously produced while curing the resin in and after passing through the mold. FR of this embodiment
Of the ten plate-shaped molds for the production of the P fine filament, the ten molds for the production of the FRP fine filament used in Example 2, the latter five were made of quartz glass plates of the same size and shape. It is replaced with a mold D '. Then, an ultraviolet shielding slit 10 having a thickness of 1 mm is interposed between the first five plate-shaped dies D and the fifth five plate-shaped dies D ', and only the five quartz glass plate-shaped dies D' are provided. Was set to enter the ultraviolet irradiation region. The UV-curable resin used in the present embodiment is the same as that in the second embodiment.
2 parts of an internal mold release agent was added to the UV curable resin. The production conditions of the other FRP filaments were the same as those in Example 2, and the FRP filaments used for the tension member for the optical fiber cable having a diameter of 0.38 mm were produced.

At this time, the obtained FRP fine filament had an average diameter of 0.375 mm and a standard deviation of 0.003 mm, and it was confirmed that the precision of the cross-sectional dimension and roundness was excellent. Furthermore, the surface of the obtained FRP striatum was observed,
It was confirmed that the FRP fine striated body had good surface gloss, no burrs were observed on the surface, and the surface smoothness was particularly excellent. The mechanical properties are equivalent to those in Example 2, and as in Example 2, the production line can be easily set up during the production of the FRP filament, and the disconnection occurs during the continuous production of the FRP filament for 20 km. There was no line stoppage caused by the above.

(Comparative Example 1) In this comparative example, a thin FRP filament used as a tension member for an optical fiber cable having a diameter of 0.38 mm was manufactured using the same manufacturing equipment as in Example 2. The manufacturing condition different from that of Example 2 is that only one plate-shaped metal mold having a thickness of 3 mm (the shape of the opening is the same as that of Example 2) was used as a metal mold for manufacturing an FRP fine filament. .

At this time, the obtained FRP fine filament had an average diameter of 0.395 mm and a standard deviation of 0.036 mm, the average diameter was larger than the target size, and the size variation was large. The reason for this is that, as described above, since there is not a sufficient cavity length for shaping the resin-impregnated fiber, the resin-impregnated fiber is hardened immediately after molding, with springback occurring in the molded resin-impregnated fiber. It is because it was done. Furthermore, it was recognized that fiber fluff was widely distributed on the surface of the FRP fine striatum.

(Comparative Example 2) In this comparative example, the same plate-shaped die as used in Example 2 (plate-shaped die having a thickness of 3 mm: shape and size of the opening) was used as a die for manufacturing an FRP fine filament. Is Example 2
3), and a spacer is disposed between each of the three plate-shaped molds as in (2) of Example 1,
The distance between the plate-shaped dies was set to 20 mm, and the dies for manufacturing the FRP fine filaments having a total length of 49 mm were used. The spacer used at this time had an outer diameter of 7.5 mm and an inner diameter of 4.
It is a hollow cylindrical spacer (material: JIS SUS304) having a length of 4 mm and a length of 20 mm. The manufacturing conditions for the other FRP fine filaments were the same as those in Example 2, and the diameter was 0.38.
A thin FRP filament used for a tension member for an optical fiber cable having a thickness of 1 mm was manufactured.

At this time, the obtained FRP fine filament had an average diameter of 0.395 mm and a standard deviation of 0.009 mm. As in Comparative Example 1, the average dimension of the diameter was larger than the target dimension. Became bigger. Further, in this comparative example, when about 100 m of the FRP fine filament was manufactured, fiber debris was deposited on the introduction side of the second and subsequent dies, and one of the six fibers F used for the resin-impregnated fiber was used. The wire was broken, and the production of the FRP fine filaments had to be interrupted.

(Comparative Example 3) In this comparative example, as in Example 4, as shown in FIG.
It is introduced into a mold for manufacturing a P fine filament, and the FRP fine filament is continuously produced while curing the resin in and after passing through the mold. In the present comparative example, a pair of upper and lower quartz glass split molds 18 shown in FIG. 8 were used, and the rear part of the quartz glass split mold was set so as to enter the ultraviolet irradiation region (see FIG. 9). Other manufacturing conditions (including the composition of the ultraviolet curable resin) of this comparative example are the same as those of Example 4.

In this comparative example, several tens of minutes after the start of production of the FRP fine filament, a part of the resin-impregnated fiber was broken, and the production was interrupted because the diameter of the FRP fine filament became extremely thin. . Observation of the condition of the quartz glass split mold 18 revealed that the resin penetrated into the fitting surface of the upper mold 18a and the lower mold 18b in the cavity 19 of the quartz glass split mold and gelled. It was observed that the fibers were stuck and clogged.

As described above, the FRP fine filament manufactured using the mold for manufacturing the FRP fine filament of the present invention has excellent shape (such as cross-sectional dimensions and roundness) and good surface properties. Is obtained. The mold for manufacturing the FRP fine filament according to the present invention is composed of a plurality of plate-like molds, so that the cavity required for shaping the resin-impregnated fibers having a small diameter (having a diameter of 1 mm or less), which has been conventionally difficult. The manufacture of a mold having a long length becomes easy, and the preparation process for molding for introducing the resin-impregnated fiber into the cavity having the small diameter (for a thin wire having a diameter of 1 mm or less) is significantly simplified. Furthermore, since the molding of the resin-impregnated fiber and the subsequent curing of the fiber can be easily performed by using the mold for producing the FRP fine filament of the present invention, the diameter of the fiber is particularly small.
It is capable of stably producing continuous FRP filaments having a diameter of not more than mm by the pultrusion method.

Although a plurality of plate-shaped dies having the same cavity diameter are used as the dies for manufacturing the FRP fine filaments according to the embodiment of the present invention, orifices (tapered cavities) are provided in the cavities of the plate-shaped dies. be able to. By using plate-shaped dies having this orifice and having different cavities, the dies for manufacturing the FRP fine filaments of the present invention can easily obtain the function of a throttle nozzle. As described above, the metal mold for manufacturing the FRP fine filament of the present invention has a feature that the arrangement of the plate-shaped metal mold can be easily rearranged or extended.

The material of the plate-shaped mold used for the mold for producing the FRP fine filaments of the present invention may be any material as long as it is usually used for the mold of the pultrusion. For example, stainless steel, hardened steel, cemented carbide, ceramics (for example, quartz glass or the like), organic resins (for example, fluorine resin, silicon resin, or the like) can be used. On the other hand, since glass fiber is used for the FRP fine filament for the tension member of the optical fiber cable, considering the abrasion caused by the glass fiber, the material of the plate-shaped mold is made of stainless steel, quenched steel, or carbide. Alloys and the like are desirable.

[0055]

As described above, the mold for manufacturing an FRP fine filament according to the first aspect of the present invention has a F
In the continuous production of RP fine filaments by the pultrusion method, molding of resin-impregnated fibers and subsequent curing of the fibers can be facilitated, and the resin-impregnated fibers have good surface properties and a good shape (cross-sectional dimensions and roundness). Degree) can be accurately formed. In particular, a diameter of 0.1 to 1
It is effective for the production of FRP fine filaments having a thickness of mm. And, the mold for producing the FRP fine filament of the present invention has a thickness of 2 m.
By connecting a plurality of plate-shaped molds in the range of m to 5 mm, it is possible to easily form a cavity length effective for shaping the resin-impregnated fibers. By providing openings in these plate-shaped dies, resin-impregnated fibers can be easily introduced into the plate-shaped dies.

According to the second aspect of the present invention, the mold for manufacturing an FRP fine filament can have a cavity length of 6 mm or more effective for shaping the resin-impregnated fiber, and the cavity length can be reduced. By setting the total to 30 mm or less, it is possible to prevent fiber breakage due to an increase in contact resistance between the cavity and the resin-impregnated fiber during the molding process. The invention according to claim 3 is characterized in that the length of the opening provided in the plate-shaped mold provided in the mold for producing the FRP fine filament of the present invention is in the range of 0.3 mm to 1 mm. When the opening angle of the opening is 60 ° to 140 °, the effective cavity length is maintained and the resin-impregnated fibers can be more easily introduced into the plate-shaped mold.

According to the fifth aspect of the present invention, in the metal mold for manufacturing an FRP fine linear body, each plate-shaped mold is communicated with a guide rod provided in a plurality of guide holes provided in each plate-shaped mold. Since each plate mold is movable by being guided by the guide rod, the positioning of each plate mold can be easily performed by the guide rod, and the cavity provided in the plate mold is provided. It is possible to maintain the straightness of the vehicle. Furthermore, since each of the plate molds is movable,
The arrangement and extension of the plate-shaped mold can be easily performed. In addition to this, the resin impregnated fiber is passed through the cavity of each plate-shaped mold in advance, and the mold for manufacturing the FRP fine filament can be assembled. It is easy to pass the resin-impregnated fiber through the cavity, and preparation for the molding step is facilitated.

According to the sixth aspect of the present invention, by providing a gap of 10 mm or less between the plate-shaped molds of the molds for producing the FRP fine filaments, the cavity is continuous through the opening. By shortening the length and reducing the take-up resistance of the resin-impregnated fiber in the mold, it is possible to prevent the fiber from being broken.

According to a seventh aspect of the present invention, each gap between the plate-shaped molds is formed by providing a spacer between the plate-shaped molds. It is possible to easily form a gap between the molds and maintain the straightness of the cavity provided in the plate mold. Further, in the invention according to claim 8, the spacer is provided with a hollow portion through which the resin-impregnated fiber passes, and by holding the resin liquid in the hollow portion, the resin-impregnated fiber in the gap between the plate-like dies is removed. It is intended to prevent bleeding of the resin and to maintain the resin amount of the resin-impregnated fiber.

According to a tenth aspect of the present invention, an ultraviolet curable resin is used for the production of the FRP fine filament, and the resin is cured by ultraviolet rays. This makes it possible to more accurately obtain the cross-sectional dimension and straightness of the FRP fine filament.

[Brief description of the drawings]

FIG. 1 is a schematic view of an apparatus for manufacturing an FRP fine filament used in an embodiment of the present invention.

FIG. 2 is a view showing a detailed shape of a plate-shaped mold used for a mold for manufacturing an FRP fine filament used in an example of the present invention;
Fig. A is a side view of the plate-shaped mold, and Fig. B is a plan view of the plate-shaped mold.

FIG. 3 is a schematic view showing an arrangement in which a mold for manufacturing an FRP fine filament according to the present invention is incorporated in an ultraviolet irradiation device in Example 3 of the present invention.

FIG. 4 is a view for explaining an example of assembling a mold (claim 1) for producing an FRP fine filament according to the present invention, and FIG.
It is sectional drawing of the metal mold | die for manufacture of a P fine filament, and FIG. B is a perspective view in the middle of assembling the metal mold for production of the FRP fine filament of the present invention.

FIG. 5 is a sectional structural view for explaining an example of assembling a mold (claim 4) for manufacturing a FRP fine filament according to the present invention.

FIG. 6 is a view for explaining an example of assembling a metal mold (claim 7) for producing an FRP fine filament of the present invention, and FIG.
It is sectional drawing of the metal mold | die for manufacture of a P fine filament, and FIG. B is a perspective view in the middle of assembling the metal mold for production of the FRP fine filament of the present invention.

FIG. 7 is a view for explaining an example of assembling a mold (claim 8) for producing an FRP fine filament according to the present invention, and FIG.
It is sectional drawing of the metal mold | die for manufacture of a P fine filament, and FIG. B is a perspective view in the middle of assembling the metal mold for production of the FRP fine filament of the present invention.

FIG. 8: FR of split type made of quartz glass used in Comparative Example 3
It is the schematic of the metal mold | die for manufacture of a P fine filament.

FIG. 9 shows a quartz glass split mold FR in Comparative Example 3.
It is the schematic which shows the arrangement | positioning which built in the ultraviolet irradiation apparatus the metal mold | die for manufacture of a P filamentous body.

FIG. 10 is a schematic view of a conventional apparatus for manufacturing an FRP fine filament.

[Explanation of symbols]

F: Fiber (glass yarn) R: Resin D (D1 to D10): Plate mold D ': Quartz glass plate mold d: Plate mold having a convex part 1: Creel stand 1a: For thread supply Bobbin 2: Tension applying device 3: Guide plate 4: Resin impregnation tank 5: Spreader 6: UV irradiation device 7: Guide roller 8: Take-up machine 9: Winding spool 10: UV shielding plate 11: Plate-shaped mold group holder (Mold for Manufacturing FRP Fine Strips of the Present Invention) 12: Ultraviolet Lamp 13: Reflection Gun 14: Cavity of Plate Mold 15: Projection of Plate Mold 16: Opening of Plate Mold 17: Mold (conventional mold for manufacturing FRP fine strips) 18: Quartz glass split mold 18a: Quartz glass split mold upper mold 18b: Quartz glass split mold lower mold 19: Quartz glass split mold Cavity 20: quartz glass Opening of cavity of split mold 21: Guide hole of plate-shaped mold 22: Guide rod 23: Screw for fixing guide rod 24: Spacer 24a: Guide hole of spacer 25: Spacer having hollow part for holding resin liquid 25a: Guide hole of spacer with hollow part for holding resin liquid

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F203 AA36 AA39 AA43 AA44 AC05 AD04 AD16 AJ06 AJ11 AR07 AR12 DA12 DB02 DB11 DC08 DD01 DF01 DF05 DF15 DF23 4F205 AA36 AA39 AA43 AA44 AC05 AD04 AD16 AJ06 AJ11 HA27 HA12 HB02 HC02 HC16 HF05 HK02 HK05 HK10 HK19 HK31 HM03

Claims (12)

[Claims] 1. An impregnated fiber is impregnated into a fiber, a fiber impregnated with the resin is introduced into a mold, and the resin is hardened in the mold and / or after passing through the mold to produce a continuous FRP filament. In the method, the mold has a thickness of 2 mm to 5 mm.
And a plurality of plate-shaped molds in the range of, such that the cavities provided in these plate-shaped molds communicate,
Consisting of a plate-shaped mold group configured to connect these plate-shaped dies,
Further, in each of the plate-shaped molds, a tapered opening is provided on the inlet side of the resin-impregnated fiber, and the opening is connected to a cavity of the plate-shaped mold. Mold for manufacturing strips. 2. The mold according to claim 1, wherein the sum of the lengths of the cavities provided in the plate-shaped mold group is in a range of 6 mm to 30 mm. 3. The opening of each of the plate-shaped molds has a length in a range of 0.3 mm to 1 mm, and an opening angle of the opening is 60 ° to 140 °. 3. A mold for producing the FRP fine filament according to 2. 4. In the plate-shaped mold group, the taper of the opening of the plate-shaped mold at the subsequent stage of the plate-shaped mold is fitted to the exit side of the resin-impregnated fiber of each preceding plate-shaped mold. The mold according to claim 1, wherein a convex portion is provided, and a cavity is provided in the convex portion. 5. A plurality of guide holes are provided in each of the plate molds so as to communicate the plate mold group, and guide rods communicating the plate mold group are inserted into these guide holes. The mold for manufacturing an FRP fine filament according to any one of claims 1 to 4, wherein each of the plate-shaped molds is movable by being guided by the guide rod. 6. The FRP thin wire according to claim 1, wherein a gap of 10 mm or less is provided between the plate-shaped dies of the connected plate-shaped die group. Mold for manufacturing strips. 7. The mold according to claim 6, wherein the gap is formed by providing a spacer between the plate molds. 8. The mold for producing an FRP fine filament according to claim 7, wherein a hollow portion through which the resin-impregnated fiber passes is provided in the spacer, and the hollow portion holds the resin liquid. 9. The mold according to claim 1, wherein the resin liquid is an ultraviolet-curable resin liquid. 10. The mold according to claim 1, wherein a part or all of the plurality of plate molds is made of a material that transmits ultraviolet light. 11. Production of an FRP fine filament having a diameter of 0.1 mm to 1 mm produced using the mold for producing an FRP fine filament according to any one of claims 1 to 10. Mold. 12. A method for producing an FRP fine filament, comprising using the mold for producing an FRP fine filament according to any one of claims 1 to 11.