Page 42 - Market Analysis Report of Optical Communications Field in China & Global market 2015

efk
fiber yarn, and the heat-resistant property is the
most excellent.
The tensile strength of basalt fiber is 1.5~2 times
of metal, 1.2~1.5 times of E glass fiber. From the
comparison of the measured values from figure
2 and table 2 we can find that single glass fiber
of 785tex can only provide about 400N tensile
force, which is 470N for basalt fiber of the same
type. Excellent tensile property makes the basalt
fiber reinforced cable a smaller diameter to meet
the same mechanical properties. It can save scare
resources of pipeline and greatly improve the
utilization rate of pipeline when used in pipeline.
2.2 Environmental tolerance property
Optical fiber cable is usually oil filling structure 3 Compound drip
when used in outdoor, the structure makes
that the fiber reinforcement contact with filling
compound for a long time. If the bearing
capacity of reinforcement is decreased obviously
under the effect of active medium, this will
lead to an undoubtedly fatal influence on the
life of cables. An experiment proved that after
soaking in acid solution for 2 hours and alkaline
solution for 1hour, the bearing tensile strength
of basalt fiber reinforcement is reduced by 25%,
which is 40% for glass fiber. This suggests that
basalt fiber has a more excellent performance
Figure 3. Basalt fiber reinforced ADSS (2.2FRP, 20
basalt fibers of 800tex)
Figure 4. Cable strain curve of basalt fiber
reinforced ADSS (2012 Nov. 6)
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Table 5. Mechanical property test results of basalt fiber reinforced ADSS (2012 Nov. 6)
Items Test method Test condition
Tension :5000N
Tensile strength IEC
60794-1-2 E1 Tension :10000N
Crush Pressure :3500N, 15min
Impact IEC
Repeated bending 60794-1-2 E3
Torsion
IEC
60794-1-2 E4 4.5N·m, 5 points, 3 times per point The residual increase in attenuation is 0.005dB
IEC Load: 150N Bending radius:
60794-1-2 E4 20 cable diameters ±90°
Number of cycles: 30
IEC
60794-1-2 E7 Load: 150N Bending radius:
20 cable diameters ±180°
Number of cycles: 10
Table 6. Environmental performance test methods and results
Number Item Test method
1 Temperature cycling IEC-60794-1-2
2 Water penetration F1
IEC-60794-1-2
F5
IEC-60794-1-2
F6
in active medium tolerance and its application
as cable reinforcement can make sure the long
lifetime of cables. Actual experiences of the
cable application show that because of the
special laying environment and installation
requirements, cable strengthen materials
creep under a lot of stress conditions. With
the increase of service time, the modulus and
strength of common cable strengthen material
will reduce gradually. Creepage will lead to
the deformation or damage of the materials
and the strengthen function will eventually
lose. According to the results of resistance to
creep experiment of basalt fiber, the long-term
loads on sample of 100MPa (20% stress level),
200MPa (40% stress level), 300MPa (60% stress
level), after 1080h, the bending creep values are
0.12mm, 0.35mm and 0.45mm. It shows that
basalt fiber has a good creep property. As for
the long-term application, thin rods made of
continuous basalt fiber has no traces of fatigue
damage after a long time (more than 9 years)
subjected to cyclic loading. It is unbelievable
to achieve such performance for glass fiber.
So basalt fiber reinforced cables have longer
lifetime and better stability in using.
Hygroscopicity of basalt fiber is 6~8 times lower
than the glass fiber. When in long-term laying
applications used as reinforcement and auxiliary
reinforcement for cables, it can effectively avoid
fiber hydrogen damage caused by wet to ensure
the cable transmission performance.
III Manufacture and test of basalt fiber
reinforced cable
We use basalt fiber yarns of 800tex as auxiliary
reinforcement, design and manufacture the
ADSS as shown in figure 3. Figure 4 is the tensile
strain curve of the cable. Through the curve
and our design parameters, we can measure the
effective modulus of elasticity of the basalt fiber
yarn is about 80GPa, which is really greater than
that of glass fiber yarn.
Test results
Fiber strain is 0.000%
Fiber attenuation change is 0.026dB
Fiber strain is 0.600%
Fiber attenuation change is 0.027dB
Cable break after keep pull of 10000N for 1 min
The residual increase in attenuation is 0.010dB
The residual increase in attenuation is 0.005dB
The residual increase in attenuation is0.002dB
Test results
-40 ℃ ～ +60 ℃ constant temperature for 12h
per point, Δ α ≤ 0.1dB/km relative to 20℃
Type L water jacket Height of water: 1m
Sample length: 3m No water penetrate
from the cross-section for 24h
No compound drips at temperature of 70℃
Tensile additional decay curve of the cable is
shown in figure 5, we can see the attenuation
change value is within 0.03dB. Table 5 is
mechanical property test summary, table 6 is
environment performance test summary, all can
satisfy the requirements of relevant standards.
IV Conclusions
As for the comparison of mainstream fiber
reinforcement and basalt fiber reinforcement
in cables, the advantage in performance and
price of basalt fiber reinforced cable is obvious.
It has the possibility of fully replace the current
mainstream fiber reinforced cable. At least it
provides an entirely new solutions and ideas for
the design and application of optical fiber cables,
and its application prospect is very broad.
At present we HTGD declare China's
communication industry standard YD/T 1181.5-
2015 “Characteristics of non-metal reinforcement
for optical fiber cables part5: Basalt fiber
yarns and reinforced plastic rods” as leading
organization. The drafting and publication of the
standard will open a new chapter for basalt yarn
and reinforced plastic rod used in cables, and will
play a strategic role for the new situation of non-
metallic cable design.
Figure 5. Tensile additional decay curve of basalt
fiber reinforced ADSS (2012 Nov. 6)