JP3138447B2 - Pipe and fiber optic cable for compressed air - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cable such as an optical fiber unit or a single-core optical fiber, and an attached pipe for an optical fiber such as a power cable or a single pipe using compressed air. The present invention relates to a pipe for passing a wire and an optical fiber cable which can smoothly pass through a long pipe of 500 m or more.

[0002]

2. Description of the Related Art In recent years, passing an optical fiber cable such as an optical fiber unit (a single-core optical fiber or the like is also possible) through a pipe for communication is superior to a conventional method using a pull cord. As a method having such a feature, a striated body wiring method using the viscous force of compressed air and the pushing force of a pinch roller has been proposed.

FIG. 7 shows an example. In this method, a communication line 2 through which the striated body L is passed and an air supply path 3 are provided in the communication line head 1, and a long line having a length of 500 m or more is provided on the outlet side of the communication line head 1. On the other hand, a pair of pinch rollers 6 and 6 contact the air leak prevention portion 5 and the upper and lower sides of the running line L on the inlet side of the line head 1. , 6 is supplied, compressed air is supplied from the outside to the air supply path 3,
The striated body L is sent out from the introduction port side of the passage head 1 to the striated body passage pipe 4 through the sending / outlet side. According to this method, the traveling linear body L advances while being rubbed against the inner surface of the communication pipe 4, so that the smaller the frictional resistance between the linear body L and the communication pipe 4, the smoother the wiring. .

[0004]

However, in this kind of conventional wiring method, the sheath (outside) of the filament L is taken into account without paying much attention to the friction between the filament L and the pipe 4. Since the body and the pipe 4 are formed of a normal plastic material, the frictional resistance between them is not always small. In particular, when the insertion distance of the striatum L is long (for example, several km), The frictional force increases and the striated body L
Was difficult.

[0005] For this reason, in order to secure a smooth line, measures such as lowering the line speed or increasing the delivery pressure can be considered, but if the line speed is reduced, the line time is reduced. In addition, if the delivery pressure is increased, there is a possibility that the striatum L may be bent or broken due to excessive pressure.

The present invention has been made in view of such a conventional situation.

[0007]

Means for Solving the Problems One of the present invention is as follows.
A wire-passing pipe comprising a polyolefin-based resin to be wire-passing the compressed air for delivering the optical fiber cable, the pipe, and molded by mixing free machine additives and bleed-out of the lubricant to the polyolefin resin As a result, at least the protrusions made of the inorganic additive are projected on the inner surface of the pipe, and the lubricant is bleed out to reduce the frictional resistance between the inner surface of the pipe and the cable surface. It is in the pipe for passing the compressed air of the optical fiber cable.

Another aspect of the present invention is to provide a
Forming the outermost layer to be wire-passing with compressed air to an optical fiber cable ing a plastic sheath, the sheath of the optical fiber cable, a mixture of free machine additives and bleed-out of the lubricant to the polyolefin resin Then, the protrusions of the inorganic additive are projected on the surface of the cable , and the lubricant is bleed out, so that the cable is
In the optical fiber cable, characterized in that reduced the frictional resistance between the table surface and the pipe inner surface.

[0009]

As described above, according to the present invention, the inorganic additive made of silica and the bleed-out lubricant are mixed in the resin material made of polyolefin resin on either the pipe side or the striated body side. At the time of body wiring, extremely smooth wiring performance is obtained by the protrusions of the inorganic additive and the bleed-out lubricant.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a pipe for a striated body according to the present invention. The striated body pipe 40 has a bleed-out property made of a polyolefin resin such as polyethylene as a base resin, an inorganic additive made of natural silica or synthetic silica, and a fatty acid amide-based lubricant, for example. Since the lubricant is mixed and molded, at least on the inner surface side, a projection 51 composed of a partially exposed portion of the inorganic additive is projected,
Further, as shown in the enlarged view of FIG. 2, the bleed-out of the lubricant causes the bleed layer 5 to be in the form of spots or a thin film.
2 is made.

[0011] The term "lubricant" as used herein includes not only a so-called lubricant that easily bleeds out, but also a similar additive having the same kind of properties. This bleedout is formed from the amorphous part of a polyolefin resin such as polyethylene to the surface. Bleed-out property is a phenomenon in which precipitation is easy to occur. The same applies to the lubricants below.

The projections 51 and the bleed layer 52
Thereby, good sliding performance is provided to the inner surface of the striated body passage pipe 40. In the case of silica, since its shape is more acute, the sliding performance is somewhat inferior to inorganic additives such as zeolite which is close to spherical, but excellent sliding performance is obtained as compared to the case without addition. . Therefore, when an optical fiber cable (including a single-core optical fiber and an optical fiber unit) is passed through the pipe for transmission 40, the coefficient of friction is small, and a very smooth transmission can be obtained.

The protrusions 51 and the bleed layers 52
When the inorganic additive is natural silica, 0.01 to 0.1 part by weight, or synthetic silica is 0.05 to 0 part by weight, based on 100 parts by weight of the polyolefin resin material of the base resin. 0.5 parts by weight and about 1 to 20 parts by weight of a lubricant may be added. The reason is that when the amount of the inorganic additive is natural silica, the protrusions 51 having a desired sliding function cannot be obtained if the amount is less than 0.01 part by weight, and if the amount exceeds 0.1 part by weight, the resin mechanical In the case of synthetic silica, if the synthetic silica is less than 0.05 parts by weight, the protrusion 51 having a desired sliding function cannot be obtained. It is because it falls. further,
If the amount of the lubricant is less than 1 part by weight, the bleed layer 52 having a desired sliding function cannot be obtained. If the amount exceeds 20 parts by weight, the bleed amount becomes too large, and the mechanical properties of the resin also deteriorate. .

FIG. 3 shows an embodiment of the optical fiber cable according to the present invention. If this cable L _1, in the case of the optical fiber unit the optical fiber is housed inside (single core optical fiber is also available), the time of manufacture of the plastic sheath 60 forming the outermost layer, the base resin is a polyethylene such as Since the polyolefin resin is mixed with an inorganic additive composed of natural silica or synthetic silica, and a bleed-out lubricant composed of, for example, a fatty acid amide-based lubricant, the mixture is molded. As shown in the enlarged view of FIG. 4, a spot-like or thin-film bleed layer 52 is formed by projecting a projection 51 which is partially exposed and further bleeding out a lubricant.

[0015] The protruding projection 51 and the bleed layer 52, the surface of the optical fiber cable L ₁ is good sliding performance is imparted. Therefore, in the optical fiber cable L _1, even if the normal striatum communication line pipe, small coefficient of friction with the pipe inner surface, a very smooth passing line is obtained.

The protrusions 51 and the bleed layer 52
When the inorganic additive is natural silica, 0.01 to 0.1 part by weight, or synthetic silica is 0.05 to 0 part by weight, based on 100 parts by weight of the polyolefin resin material of the base resin. 0.5 parts by weight and about 1 to 20 parts by weight of a lubricant may be added. The reason is that when the amount of the inorganic additive is natural silica, the protrusions 51 having a desired sliding function cannot be obtained if the amount is less than 0.01 part by weight, and if the amount exceeds 0.1 part by weight, the resin mechanical In the case of synthetic silica, if the synthetic silica is less than 0.05 parts by weight, the protrusion 51 having a desired sliding function cannot be obtained. It is because it falls. further,
If the amount of the lubricant is less than 1 part by weight, the bleed layer 52 having a desired sliding function cannot be obtained. If the amount exceeds 20 parts by weight, the bleed amount becomes too large, and the mechanical properties of the resin also deteriorate. .

In each of the above embodiments, the means for reducing the friction coefficient is provided on either the pipe side or the cable side. However, the present invention is not limited to this, and is shown in FIG. As noted, it can be applied to both pipes and cables. As a result, a lower coefficient of friction is obtained, and a smoother line is obtained.

In each of the examples, the inorganic additive is silica. However, the present invention is not limited to this.
Other additives may be used. For example, a natural zeolite or an A-type or X-type synthetic zeolite-based spherical inorganic additive, an anhydrous spherical inorganic additive such as an amorphous aluminosilicate salt obtained by making this zeolite amorphous, and the like can be mentioned.

Incidentally, the following tests were conducted to confirm the effects of the pipe and optical fiber cable according to the present invention. (1) First, a pipe for communication according to the present invention formed by mixing a polyolefin resin (high-density polyethylene) as a base resin with an inorganic additive made of natural silica and an erucamide amide lubricant (Example product 1) And a communication pipe (Example product 2) of the present invention formed by mixing a polyolefin resin (high-density polyethylene) as a base resin with an inorganic additive made of synthetic silica and an erucamide amide lubricant. An ordinary line pipe (comparative example 1) molded with an added polyolefin resin (high-density polyethylene) was prepared, and the outermost layer of these pipes was formed of a normal plastic sheath as a striated body. The pumping time and pressure when the fiber unit was passed were examined. The results are shown in Table 1.

Here, the measurement of the coefficient of friction between each pipe and the optical fiber unit is performed using, for example, a coefficient of friction measuring device 100 as shown in FIG. That is, this device 100
Bobbin (body diameter = 300 mm) 101 with pipe 1 for measurement
02 about 3 turns (θ = 6π), and this pipe 1
02, the optical fiber unit 103 is passed through the optical fiber unit 103, and one of them is pulled with the back tension Fb, and the other is pulled from the other. The coefficient μ is determined. μ = 1 / θ · In (Ft / Fb) (1) Note that the angle θ is displayed as a winding angle on the bobbin, and as described above, the rotation of three rotations is performed. In this case, θ = 6π. In addition, the pumping conditions during the passage are 5 drums with a body diameter of 1000 mm.
And the optical fiber unit is passed through the pipe while changing the pressure.
A pumping time of 00 m was investigated.

[0021]

[Table 1]

From Table 1, it can be seen that in Example 1 and Example 2 according to the present invention, the coefficient of friction was small and 4 kg / cm ^2.
It can be seen that the wire can be passed with a pressure as low as about 10 minutes. On the other hand, the comparative example 1 has a large coefficient of friction and a large pressure of about 10 kg / cm ² ,
It was not possible to connect by pressure.

(2) Next, while the connecting pipe is made of a normal plastic material, the outermost sheath of the optical fiber unit, which is connected to this pipe, is connected to the base resin of polyolefin resin (high Density polyethylene)
The optical fiber cable of the present invention (Example product 3) molded by mixing an inorganic additive composed of natural silica and an erucamide amide lubricant, and a polyolefin resin (high-density polyethylene) as a base resin from synthetic silica Fiber cable of the present invention (Example product 4) molded by mixing an inorganic additive and an erucamide amide lubricant, and a normal optical fiber cable molded by a non-added polyolefin resin (high-density polyethylene) (Comparative Example Product 2) was prepared, and the pumping time and pressure when these optical fiber cables were passed through the pipe were examined. The result is
Also shown in Table 2.

Here, the measurement of the coefficient of friction between each pipe and the optical fiber cable, and the passage time, pressure, etc., are performed in the same manner as in the above example. The results were as shown in Table 2.

[0025]

[Table 2]

From Table 2, it can be seen that in the case of Example product 3 and Example product 4 according to the present invention, the coefficient of friction was small and 4 kg / cm ^2.
It can be seen that the wire can be passed with a pressure as low as about 10 minutes. On the other hand, the comparative example 2 has a large coefficient of friction and a large pressure of about 10 kg / cm ² ,
It was not possible to connect by pressure.

[0027]

As is apparent from the above description, according to the present invention, an inorganic additive made of silica and a bleedout are added to the base resin on the pipe side or the polyolefin resin forming the base resin of the sheath of the striatum. Because of the mixing of the lubricating lubricant, at the time of wiring, the projections of the inorganic additive and the sliding performance of the bleed-out lubricant provide extremely smooth wiring performance, A traversing line is provided.

[0028] By providing such a pipe for wire passage or a wire body for wire passage, a small pressure and a high wire speed can be obtained, so that the work efficiency can be improved. For example, 5
It can be performed in about 10 minutes even if the traffic is about 00 m. In addition, since there is no excessive pressure, the risk that the striated body bends in the pipe to make it impossible to travel, or that the striated body is bent and damaged, is greatly reduced.

When an inorganic additive and a bleed-out lubricant are blended with a polyolefin resin, a bleed layer is formed on the surface on which a large number of protrusions are formed. Even when sliding on the surface of the protrusion, the lubricant of the bleed layer is scraped off on the surface of the protrusion and held in the recess, so the lubricant does not adhere to the surface of the optical fiber cable and is taken out without friction for a long time. The coefficient is kept low.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an optical fiber cable passage pipe according to the present invention.

FIG. 2 is a partially enlarged longitudinal sectional view of the pipe of FIG.

FIG. 3 is a partial vertical sectional side view showing one embodiment of the optical fiber cable according to the present invention.

FIG. 4 is a partially enlarged longitudinal sectional view of the optical fiber cable of FIG. 2;

FIG. 5 is a partial vertical sectional side view showing a combination of a pipe for a striated body according to the present invention and an optical fiber cable according to the present invention.

FIG. 6 is a schematic explanatory view showing an apparatus for measuring a friction coefficient between a striated body pipe and an optical fiber cable.

FIG. 7 is a schematic explanatory view showing a normal striated body passing method.

[Explanation of symbols]

L ₁ Optical fiber cable (filament for wire) 40 Pipe for wire of the filament 51 Protrusion 52 Bleed layer

Continuing from the front page (72) Inventor Akira Mogi 1440, Musaki, Sakura City, Chiba Prefecture Inside Fujikura Sakura Factory (72) Inventor Suehiro Miyamoto 1440, Misaki, Sakura City, Chiba Prefecture Fujikura Sakura Factory (72) Invention Person Hideo Suzuki 1440 Mutsuzaki, Sakura-shi, Chiba Prefecture Fujikura Sakura Factory Co., Ltd. (56) References JP-A-2-50112 (JP, A) JP-A-3-214509 (JP, A) JP-A-1-120710 (JP, A) JP-A-54-76999 (JP, A) JP-A-61-19007 (JP, A) JP-A-2-50111 (JP, A) JP-A-3-220511 (JP, A) JP-A-4-115413 (JP, A) JP-A-5-159632 (JP, A) JP-A-57-80114 (JP, U) JP-A-38-4868 (JP, Y1) (58) Int.Cl. ⁷ , DB name) G02B 6/46 G02B 6/44 H02G 1/08

Claims (10)

(57) [Claims] (1)Compressed air for delivering fiber optic cable
Wire made of polyolefin resin
Pipe for The pipe Inorganic additives and polyolefin resin
Lead-out lubricantAre mixed and molded, and the result is
At least on the inner surface of the pipe with the inorganic additive
While projecting the projection, bleed out the lubricant.
The inner surface of the pipe and the optical fiber cable.
Characterized by reduced rub resistanceOptical fiber cable
Pipe with compressed air. 2. The mixing ratio of the polyolefin resin, the inorganic additive and the lubricant is 0.01 to 0.1 part by weight of the inorganic additive and 1 to 20 parts by weight of the lubricant with respect to 100 parts by weight of the polyolefin resin. The pipe according to claim 1. 3. The inorganic additive is natural silica or synthetic silica, and the lubricant is a fatty acid amide-based lubricant.
The pipe for communication as described. 4. The pipe according to claim 1, wherein the inorganic additive is a natural zeolite or a synthetic zeolite-based spherical inorganic additive. 5. The pipe according to claim 1, wherein the lubricant is an erucamide amide-based lubricant. 6.Wires with compressed air for delivery in pipe
Optical fiber whose outermost layer is made of plastic sheath
Cable,  Connect the sheath of the optical fiber cable with a polyolefin
Additives and bleed-out lubricantsMix
And forming the inorganic additive on the surface of the cable.
The protrusion is projected and the lubricant is bleed out.
To reduce the frictional resistance between the cable surface and the pipe inner surface.
Characterized byFiber optic cable. 7. The mixing ratio of the polyolefin resin, the inorganic additive and the lubricant is 0.01 to 0.1 part by weight of the inorganic additive and 1 to 20 parts by weight of the lubricant with respect to 100 parts by weight of the polyolefin resin. 7. The optical fiber cable according to claim 6, wherein: 8. The lubricant according to claim 7, wherein the inorganic additive is natural silica or synthetic silica, and the lubricant is a fatty acid amide-based lubricant.
Optical fiber cable as described. 9. The optical fiber cable according to claim 6, wherein the inorganic additive is a natural zeolite or a synthetic zeolite-based spherical inorganic additive. 10. The optical fiber cable according to claim 6, wherein the lubricant is an erucamide-based lubricant.