JPS59144688A - Taking of optical fiber core wire in coil form - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention allows a cored optical fiber having a protective layer of plastic to be easily transformed into a coiled form for use.

(B) Background Art Usually, a primary coating of a plastic ring is provided around the outer periphery of an optical fiber, and furthermore, a plastic ring is provided around the outer periphery of this coating.
A cushion layer made of rubber or the like, a secondary coating, etc. are provided. For example, materials used for the primary coating include RTV silicone, UV-curable epoxy acrylate, and urethane acrylate. Also, as a cushion layer, R
TV silicone, nylon 12, polyester elastomer, etc. are used as the secondary coating.

However, even the above-mentioned coating materials do not have a sufficient protective effect on optical fibers, and furthermore, transmission loss may increase due to changes in temperature and the like.

-1 For this reason, depending on the application, a reinforcing layer made of reinforcing fibers such as glass fibers having a small coefficient of linear expansion and a resin hardened thereon is provided as a secondary coating of the optical fiber. Optical fiber core reinforced with such an FRB layer (
Compared to conventional optical fiber cores, FEP core wires (hereinafter referred to as FEP core wires) have ■ stable temperature dependence of transmission characteristics, ■ excellent mechanical strength, and are resistant to tension, compression, bending, etc., and are easy to handle. It has the advantages of being easy to handle, ■ having a small diameter, being lightweight, and ■ being able to have a structure that does not contain metal, so that there are no problems with electromagnetic induction. Therefore, single-fiber coding is possible without using reinforcing layers such as longitudinally attached Kevlar or tensicon member insertion, which are necessary in conventional optical fiber core wires. An example of such single-fiber coding of FRP core wires is the structure shown in FIG. 1.

In the figure, 1 is an optical fiber, 2 is a silicon layer (primary coating layer + cushion layer), 3 is an FRB layer, and 4 is a PVC sheath, but of course a cord without a sheath is also possible.

Such a single-core cord can be wound around a linyl or drum and used for connecting vertically between terminal devices, between frames, or for wiring inside the machine. Another application that takes advantage of the characteristics of FRP-coated optical fiber cores is to stack FRP cores in a coil shape and bundle them instead of winding them around a drum or the like.
There is a method of use in which the FRP core wire is fed out as needed. For example, as an example of such a usage, it is effective to omit the bobbin when connecting a communication line between an observation balloon and an observation station on the ground, or when making a cable.

However, since the F and RP layers of FRP core wires have poor flexibility and high rigidity, even if you try to stack them into a coil, the repulsive force is strong and the original bending is not applied even if you bend it into a coil. The winding becomes disordered as it returns to the original shape, making the above usage impossible. Furthermore, when the core wires are stacked in a coil shape and are unwound from the coil during use, the core wires are twisted, so it is necessary to apply a reverse twist in advance, which makes it difficult to stack the core wires in a coil shape. It was becoming difficult.

(C) Disclosure of the Invention As a result of repeated research and study to provide a method for easily stacking FRP core wires into a coil shape, the present inventors have found that by applying an ethyl cyanoacrylate adhesive to FEP core wires. The present invention was achieved by discovering that it can be easily twisted and wound into a coil.

That is, the present invention provides a method for taking over an optical fiber core wire into a coil shape, which comprises twisting an optical fiber having a plastic protective layer while continuously applying a pressure ethyl cyanoacrylate adhesive and winding it up. It is related to.

For FRB, which is one of the plastic protective layers in the present invention, reinforcing fibers include glass fiber, carbon fiber, aromatic aramid fiber, alumina fiber, etc., and resins include unsaturated polyester, epoxy, polyimide, vinyl ester, etc. , phenol and other resins can be used.

The method of the present invention will be explained using Figure 1@2.

The 7-piece FRP core wire 6 is a supply bobbin for winding, and the motor 5 has a 360° winding as shown by arrow 9 in the figure.
It is designed to rotate.

The FRP core wire is given a 560° twist by this sagrai device and is wound up on the winding grain bin 8 via the guide roller 9, but at this time, it is coated with adhesive by the adhesive coating device 10. The given twist is fixed and wound. Thereafter, the coil is detached from the take-up grain bin and put into practical use. As the adhesive at this time, an ethyl cyanoacrylate adhesive is used because a short bonding time is required. In order to apply it continuously and uniformly, the viscosity (25°C) is
The tensile shear strength when the adherend is FRB is preferably less than 10-10
It is necessary that the adhesive has a tensile shear strength of 0 Kg f/am.
861.

B) Best Mode for Carrying Out the Invention Example 1 A 20 μm optical fiber coated with a silicon layer has a diameter of 0.
A 4 m long optical fiber was coated with FRP (glass fiber impregnated with unsaturated polyester resin) to obtain a 0.9 fin optical fiber core. This FRP core wire has a diameter of 12
Table 1 shows the results of twisting once/120 ms into a 0 m coil.

Table 1 Note) Tensile shear strength measurement method... J Engineering S-ni-6861 Adherent... FRP Adhesive O has weak adhesive strength, making it difficult to wind in an aligned manner, resulting in a coiled takeover. Also, the viscosity of adhesive F is too high and it is difficult to apply the adhesive evenly, so FRP is partially twisted.
The winding of the core wire was disrupted and it was not possible to take over.

Although the adhesive was able to be applied evenly and a coil-like takeover was created with aligned winding, the adhesive was too strong and the FRP could not be smoothed.
It was not possible to feed out the core wire. Furthermore, since adhesive E had a slightly high viscosity, the coating was uneven in some areas, resulting in slight irregularities in the winding.

(E) Fields in which the invention is utilized Although the FRP core wire has been shown as an example, the present invention can also be applied to coil-shaped takeovers of ordinary optical fiber cores that use nylon, polyester elastomer, etc. as the secondary coating. is valid.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of the structure for single-fiber coding of an FRP optical fiber core, and FIG. 2 is a flow sheet showing an outline of the method of the present invention. Agents 1) Akira’s agent Ryo Hagiwara −

Claims (3)

[Claims] (1) A method of taking over an optical fiber core wire into a coil shape, which consists of twisting an optical fiber having a plastic protective layer while continuously applying an ethyl cyanoacrylate adhesive and winding it up. (2) The ethyl cyanoacrylate adhesive has a viscosity (25°C) of 10 cp or less and a tensile shear strength when the adherend is fiber-reinforced plastic (J Engineering S-ni-6861).
2. A method for taking over an optical fiber core wire in a coil shape according to claim 1, wherein the optical fiber core wire has a characteristic of 10 to 100 Kgf/α2. (3) Claim 1, in which the Hikari 7 Inoku having a protective layer of plastic is coated with a layer made by impregnating reinforcing fibers with a thermosetting resin and curing it as a secondary coating.
A method for taking over the optical fiber core wire according to item 1 or 2 in a coiled form.