JPS60211707A - Method of vulcanizing sheath of optical fiber-filled gap type cable - 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 [Background and Objects of the Invention] The present invention relates to a method for vulcanizing the sheath of a fiber optic fiber.

Conventionally, as a method for curing the sheath of cab-tie AI cables, a method is known in which lead for vulcanization is coated and vulcanized on the sheath. 1- There are some difficulties such as requiring a number. In addition, in the case of sheath vulcanization for optical fiber cables, plastic materials (
For example, there are problems such as thermal softening of materials (such as nylon), and the conventional sheath vulcanization conditions of 150 to 160° C. may damage the optical fiber.

The object of the present invention is to overcome the drawbacks of the prior art described above.
An object of the present invention is to provide a method for vulcanizing a 7-key sheath of a cabtie containing an optical fiber.

[Summary of the Invention] The gist of the present invention is that, as a method of vulcanizing a sheath, the sheath is vulcanized at a temperature below the softening point of the protective layer of Hikanoaiba. i'? It's about being able to do something.

In addition, this type of flat type cable can be added to a 1ll IC drum-wound can. When the number of windings increases to 2 or 3, heat softening of the rubber during vulcanization, crushing or deformation due to the weight of the couple, etc. may occur, or steam may be discharged after vulcanization for a specified period of time. There is a risk of blistering in the sheath, so the solution is to insert a piece of canvas tape or other material of suitable width and width according to Google's XJ method between the cable layers. It is desirable to prevent crushing and deformation by rotating the vulcanization drum in the forward or reverse direction at low speed during vulcanization. 4j It is desirable to prevent the sheath from bulging by exhausting the air while maintaining a balance between the internal pressure in the cable and the pressure in the can without lowering the pressure suddenly.

In addition, when the optical fiber is coated with a plastic material such as nylon as a protective layer, the softening temperature of nylon is 1
Since the temperature is 60 to 168 degrees Celsius, the vulcanization temperature of the sheath should be 130 to 140 degrees Celsius, as conventional 150 to 160 degrees Celsius may damage the optical fiber.
It is necessary to vulcanize at a low temperature of about °C.

[Actual Flow Example] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 shows a cross section of a flat type I7 cable containing optical fiber.
Two optical fiber units 4 each having a protective layer 42 coated by extrusion are arranged in parallel, and a common sheath 3 is formed by extrusion around the power line core and the optical fiber units 1.

Now, C is extruded in a sheath extrusion process (not particularly shown).
The flat type V-shaped tie 17 and the unvulcanized cable 11 of the FF11 type are wound around a predetermined vulcanizing drum 6 in stages as shown in FIG. , at this time, the interlayer of couple 11 (
An intervening material 12 such as canvas is inserted between the steps as necessary.

Next, the semi-aged vulcanization drum 〇 is shown in Figures 2 and 3.
It is assembled into a vulcanizing can 5 as shown in the figure J, and the sheath vulcanization of the sheathed unvulcanized couple 11 is performed.

d3 in vulcanization ζ115 'CJllll 11! ll l
- The ram 6 should be installed at the bottom 1-1-luer 1-C so that it can be rotated appropriately.

The under roll 7 is connected to a drive motor 8,
By operating the motor 8, the vulcanizing drum 6 can be rotated as appropriate from the outside of the 115.
There is. In addition, in FIG. 2, 9 is a steam introduction valve, and 10 is a steam exhaust valve C. Curing 1iXi article r1 varies depending on the type of sheath rubber, but usually the vulcanization temperature is 130 to 140°C (vapor pressure 4, 0 Kg/cm2), the vulcanization time is 80 minutes, t
) The sheath can be prevented from soaking, deforming, and blistering by rotating the vulcanizing drum forward and backward (interlocked with a timer, automatic operation) during vulcanization for 120 minutes.

FIG. 6 shows another embodiment in which the horizontal linear vulcanization method is adopted.

In this case, the flat type knitted V cable 11 that has been extruded in the sheath extrusion process is first placed on an arbitrary delivery drum 1.
7, and then sequentially sent out from this delivery drum 17 and fed in a straight line into the horizontal vulcanization cylinder 13,
Subsequently, it is fed into the pressurized cooling cylinder 14 and the sheath is vulcanized. In addition, in the figure, 15 is a steam packing,
16 is a water pack.

The vulcanization conditions are as follows: 150°C or less, preferably 130°C to avoid thermal deformation below the softening temperature of the iron of the protective layer of the optical fiber, using the above-mentioned vulcanizing can.
~140°C. When vulcanization is carried out at a low temperature (of course, the vulcanization periods u and 7 are longer, and in the horizontal linear vulcanization method shown in FIG. 5, the vulcanization operation may be repeated 2 to 3 times (j).

In addition, the method of the present invention is applicable to round cab ties containing optical fibers.
7 It can also be applied to the production of cables.

[Effect of the invention 1] According to the present invention, compared to the conventional lead coating (-1 method),
The number of fibers is small, and the sheath vulcanization can be done without damaging the fibers, so the value of one fiber is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a flat-type A7 cube with optical fiber, Fig. 2 is a longitudinal cross-sectional view of the add-on illumination, and Fig. 3
The figure is a cross-sectional view of the IV-IV portion of Figure ff12.
Attach the upper flat type 1-piece tie X7 cable to the unvulcanized drum.
Figure 55 is an explanatory diagram of the horizontal linear vulcanization method. 1° 1: Conductor, 2: Insulator, 3: Sheath, /I: Optical 7-noh fiber unit, 5: Vulcanizing can, 6: Vulcanizing drum, 7: Under roll, 8: Undert 1 drive motor, 9: Steam introduction valve, 10: Steam 1j1 air valve, 11: Flat cable, 12 :Sail I11.13: Vulcanizing cylinder, 14: Vulcanizing cooling box,
15: Steam packing, 16: Water packing, 17: Delivery drum. Military ) Mouth No. S Figure 7

Claims (1)

[Claims] Optical fiber cable 11 Butaikan 7 Ri--Sheath curable for optical fiber-containing 1-life cable, characterized by vulcanizing the bare sheath at a temperature below the softening point of the protective layer of the optical fiber. Sulfur method.