JPS58198005A - Method for aggregating optical fiber cable - Google Patents

Abstract

PURPOSE:To remove completely gaps at the inside of a cable unit by making silicone resin from the inlet side of an aggregating die to the center part of the die along the inwall of the die and twisting a central tensile strength body and optical fibers together to aggregate them. CONSTITUTION:A central tensile strength body 4 consisting of a tensile strength body supply 1 and optical fiber strand supplies 2 and plural fiber strands 3 are passed through a butt strap 5 and twisted by a aggregate die 6' having a recessed side on the input side in accordance with the revolution of the fiber supplies 2. When silicone resin 12 is accumulated in a resin supplying device 15 and the resin 12 is made flow from the inlet side of the die 6' to the center part of the die 6' along the inwall side, the resin 12 is accumulated in the center part and permeated into the whole tensile strength body 4 and the strands 3 without a gap and the body 4 and the strands 3 are twisted and aggregated under the completely united state. The resin 12 excessively adhered to the external surface of the unit is removed by a molder 13. Subsequently, the unit is baked by a baking device 10 to be hardened and then wound by a winder 8. Consequently, the gaps at the inside of the unit can be removed completely.

Description

[Detailed description of the invention] Waru.

Here, the main methods of twisting and assembling conventional optical fiber cables will be explained using figures.

In FIG. 1, l is the supply of the central tensile strength body;
2 is a supply of optical fiber strands, and a plurality of optical fiber strands 3 are straightened by a batten 5 with a central tensile strength member 4 as a core, and are twisted together by a gathering die 6 to form an optical fiber unit (hereinafter referred to as a unit). ) and is wound up by the winding machine 8. Note that 7 is a capstan for pulling the unit.

In this case, the optical fiber unit is wound without any reinforcement.

Further, in FIG. 2, the unit twisted together using the collecting die 6 as in FIG. 1 is coated with silicone resin using the silicone coating die 9, and then baked with the resin through the baking furnace 10, and then wound up.

Further, in FIG. 3, the supplied central tensile strength member 4 is coated with silicone resin 12 in advance using a resin applicator 11 before assembly, and in the silicone resin coated state, is twisted using an assembly die 6. Form a unit, middle I
The gap created between the L" tensile strength member 4 and the optical fiber strand 3 is filled with silicone resin 12, and the unit is formed into a circular shape using a molding machine 13 with a smooth surface such as a sponge, and passed through the entire baking drying oven 14. Wind it up.

The structure of the optical fiber unit manufactured by the method explained in FIGS. 1 to 3 is as shown in the lower right of each figure.

In the manufacturing method shown in Figure 1, there is no reinforcement at all between the optical fiber strands 3, so the twisted optical fibers collapse, breakage occurs, and the tensile strength body protrudes from the twisted surface of the optical fibers. Sometimes.

The product manufactured by the manufacturing method shown in FIG. 2 is baked with silicone resin, so during curing, there is air expansion in the gap G formed between the central tensile strength member 4 and the optical fiber strand, which is indicated by B. Produces bubbles like this.

Furthermore, in the case of the product manufactured by the manufacturing method shown in Fig. 3, the amount of silicone resin applied around the tensile strength member 4 is unstable in the length direction, and there are many gaps similar to that shown in Fig. 2, and the same phenomenon occurs. In addition to this, a portion R with no adhesion also occurs.

The present invention resides in an assembly method that completely eliminates all the gaps created in the units, which were a particular problem in the conventional assembly methods as described above, and in a method for twisting and assembling optical fibers around a central tensile strength member. The silicone resin flows from the inlet side of the collecting die, along the inner wall of the die, and into the L section of the die to an appropriate size, so that it is collected in the center of the die and completely permeates the entire assembled unit. The method of assembling optical fiber cables is characterized by simultaneously twisting and assembling the central tensile strength member and the optical fiber strands.

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 4 shows an example of an apparatus for carrying out the present invention, and FIG. 5 particularly shows an enlarged view of the assembly and forming neck portion of the apparatus of FIG.

The tensile strength body 1, the central tensile strength body 4 supplied from the optical fiber wire supply 2, and the plurality of optical fiber cables 3 pass through the batten 5, and due to the revolution of the multiple optical fiber supply 2, the inlet side forms a concave surface. The strands are twisted by the die 6', but at this time, the silicone resin 12 is accumulated in the resin supply device 15, and the silicone resin 12 is twisted on the inlet side (
The silicone resin 12 is stored in the center of the assembly die 6', and the central tensile strength member 4 and the optical fiber element The silicone resin permeates the entire wire 3 without any gaps, and the wires 3 are twisted and assembled in a completely integrated state.

Any excess silicone resin 12 adhering to the outer surface of the assembled unit is wiped off while the unit i is being formed into a circular shape using a molding tool 13 having a smooth surface such as a sponge.

The unit formed into a circular shape is baked and hardened in a baking furnace 10, and then wound up in a winder 8.

As shown in the lower right corner of FIG. 5, the cross section of the unit formed by water droplets is cured and molded with the silicone resin completely permeated therein.

One implementation of the present invention has been described above, and since the silicone resin is completely filled with the assembly die, the stirring effect due to the rotation of the edge side of the supply is large, and therefore the silicone resin completely permeates into the unit after assembly. There are no gaps even when the baking furnace is completely passed through, so no bubbles are generated due to thermal expansion.

In addition, since the unit is completely integrated with silicone resin, there is no chance of fiber collapse, breakage, or protrusion of the central tensile strength member during winding or processing in the next process.

Furthermore, as explained above, the silicone resin is completely infiltrated into the unit, aggregated, and hardened, so there are no gaps and there is no lateral pressure, minute marks, or distortion caused by thermal expansion of the air, so the cable Microbenzone cross due to temperature change after curing is small.

As described above, by implementing the present invention, an extremely excellent optical fiber cable can be obtained.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are diagrams for explaining a conventional method of assembling optical fiber cables. FIG. 4 is an explanatory diagram of an example of an apparatus for carrying out the method of the present invention. FIG. 5 is a partially enlarged view of the device shown in FIG. 4. 1... Central tensile strength member supply, 2. Optical fiber wire supply, 3... Optical fiber wire, 4 Central tensile strength member X
5 Grain board, 6.6'・Collected dice, 7... Cap 6
1 Sukun, 8 Winding machine, 9 Silicon coating die, 10.
- Baking furnace, 11. Resin applicator, 12... silicone resin, 13. Molding machine, 14. Baking drying oven, 15. Resin supply device. Agent Patent Attorney Hide Aoki 7- OI Figure 7f2

Claims (1)

[Claims] (1) In the method of twisting and assembling optical fibers around a central tensile strength member, silicone resin is accumulated in the center of the die by flowing from the inlet side of the assembly die, along the inner wall of the die, and into the center of the die; A method for assembling optical fiber cables, which is characterized by completely infiltrating the entire assembled unit with silicone resin without any gaps, and at the same time twisting and assembling the central tensile strength member and optical fibers.