Thursday, September 20, 2012

FTTH Terminal Cable related introduced!


Refers to the FTTH optical network units (ONU) installed in a home user or enterprise users place, is light access series except FTTD (optical fiber to the desk) outside the most close to the user's optical access network application type. The FTTH significant technical features is not only offer more bandwidth, and enhanced the network to data format, rate, wavelength and protocol transparency, eased restrictions on environment condition and power supply and demand, simplify the maintenance and installation.
Terminal cable has good electrical properties and mechanical performance, can in all kinds of harsh environmental conditions use for a long time. With light weight, convenient in installation, etc. Cable terminal head are widely used in electric power, petroleum chemical industry, metallurgy, railway port and construction fields.
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Tuesday, September 18, 2012

GYFTY (Layer Stranded Optical Cable) Y related definition structure!


GYTS cable is have like light transmission speed communication cable, optical fiber cable GYTS with it, transmission speed, the secrecy good, the resistance to electromagnetic interference, by good insulation, long service life, good chemical stability. GYTS cable mainly divides into: GYTS multimode optical cable, GYTS single-mode optical fiber cable two types.
The 9/125 μ m single-mode fiber or 50/125 μ m, 62.5/125 μ m multimode optical fiber sleeve into with higher resistance water material made of pine casing, pine casing filling block water combined material. Cable core center is a metal strengthen core, for multicore cable, strengthen the core should be applied a layer of PE coat. Pine casing and filling line around the center to strengthen core mutual ground compact and circular cable core. In the cable core crack filling and resistance water filling material. Double wrinkles steel belt longitudinal bag after extrusion, PE sheathed cabling.
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Sunday, September 16, 2012

Shaped Polarication Maintaining Optical Fiber introduced!



Optical fiber is fibre-optic logogram, is a use of light in a glass or plastic fiber of total reflection principle and a light transmission tool. Former Hong Kong Chinese university President high Kun and George a. Hockham first puts forward optical fiber can be used for communication ideas.
Shaped Polarication Maintaining Optical Fibersmall beatength low attenuation
Bend - insensitive good environmental adaptability Used for optical fiber gyroscope, fiber optic hydrophone, PM couper and so on.
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Friday, September 14, 2012

Standard single - mode optical fiber material is introduced.


Single-mode fiber: center glass core very fine (core is commonly 9 or 10 μ m), can pass a pattern of light. Therefore, the die room dispersion is very small, for remote communication, but there are still some material dispersion and waveguide dispersion, such single-mode fiber to the light source spectrum width stability have higher requirement that spectrum width to narrow, better stability. Later found in 1.31 u m wavelength place, single-mode fiber material dispersion and waveguide dispersion for a positive and a negative, the size also just equal. So, 1.31 u m wavelength region became optical fiber communication a very ideal job window, is now practical optical fiber communication system the main work band 1.31 u m conventional single mode optical fiber is the main parameters by the international telecommunication union (ITU - T in G652 the proposed certain, so this kind of optical fiber is also called G652 optical fiber.

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Wednesday, September 12, 2012

KRD320 description!







KRD320 regularly and relatively complete crystal shape, low content of impurities and relatively high impact strength. Suitable for hard granite, marble, concrete, refractory materials, such as stone cutting tools.



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Wednesday, September 5, 2012

Steel strand used in prestressed concrete type and description!




Stranded wire is by multiple root wire twisted consisting of the iron and steel products, carbon steel surface can according to need to increase the zinc coating, zinc alloy layer, aluminium coating (aluminum clad), copper plating layer, coating epoxy resin (epoxy coated), etc.
The most commonly used steel wires for galvanized steel wires and prestressed steel wires, commonly used in prestressed steel strand diameter 9.53 mm to 17.8 mm range, a little more coarse diameter steel wires. Prestressed steel strand each root of the steel wire is commonly 7 root, also have two root, 3 root and 19 root, wire can have metal or nonmetal coatings. Coating anticorrosive grease or paraffin wax bag HDPE called unbonded prestressed steel wires (unbonded steel strand).

Thursday, August 30, 2012

Galvanized low carbon steel wire for armouring cable production technology

Galvanized low carbon steel wire for armouring cable is made with low carbon steel pull a metal wire, iron wire according to use a different component is different also, it contains ingredients are: iron, cobalt, nickel, copper, carbon, zinc, and other elements. Will the hot metal blank rolling into 5 mm thick steel bar, and then put it into the drawing device inside draw different diameter line, and gradually reduce wire drawing dish aperture, cooling, annealing, coating and plating processing technology into all kinds of different specifications of the wire.
General use of mild steel wire is wire yield the biggest a variety, its diameter in 0.16 to 10 mm. It according to the surface state can be divided into smooth and galvanized two kinds, according to the condition of delivery and divided into cold drawn and annealing two. Cold drawn wire tensile strength, do generally use is % 26 le; 635 ~ 1000 mpa; Nail is % 26 le; 540 ~ 1320 mpa. Wire diameter is larger, the smaller the tensile strength. But building cold drawn wire tensile strength may not be less than 635 mpa. Annealed wire tensile strength in between 295 ~ 500 mpa. Choose materials, from keeping wire flexibility consideration, in order to prevent tensile strength on the high side, wire diameter small carbon content should be low; But the specifications larger nail with silk, it need carbon higher raw material, in order to avoid the wire in the punch when bending. General in the production the nail with plain steel wire, wire rod can use mechanical descaling (see wire rod mechanical descaling) and without coating processing (see lubrication carrier) can pull. In the production nail or galvanized steel wire, due to its surface quality requirement is higher, usually wire rod by mechanical descaling after a bit again by pickling and through the yellowing and with lime coating processing, to drawing. Because of low carbon steel wire, the plastic deformation resistance is small, so the drawing when a drawing process of total minus surface rate (see area reduction rate) can get bigger, maximum can reach 95%. Each time reducing surface rate is generally % 26 le; 35%. General use mild steel wire in galvanized before heat treatment or drawing process between the intermediate heat treatment, commonly used recrystallization annealing and widely used continuous furnace annealing and pit type furnace annealing in two ways. Continuous furnace annealing and continuous hot dip galvanizing or electric galvanized composition continuous production line; Pit type furnace annealing is used in the continuous operation of the production line,This is Galvanized low carbon steel wire for armouring cable
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