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What is the role of mica tape in the cable
Release time:
12 Jan,2024
Refractory mica tape referred to as mica tape, is a kind of refractory insulation material, according to the use can be divided into: motor with refractory mica tape, refractory cable with refractory mica tape. According to the structure, it is divided into: double-sided tape, single-sided tape, three-in-one tape, double-film tape, single-film tape, etc. According to the mica can be divided into: synthetic mica belt, gold mica belt, white mica belt.
1. There are three kinds of mica tape, and their respective quality performance is the best for synthetic mica and the worst for muscovite. For small-size cables, synthetic mica tape must be selected for wrapping. The Yangtze River cable editor reminds everyone that mica tape cannot be used in layering. Mica tape stored for a long time is easy to absorb moisture, so the temperature and humidity of the surrounding environment must be considered when storing mica tape.
2. When using mica tape wrapping equipment for fire-resistant cables, it shall be of good stability. The wrapping angle is preferably 300-400. The mica tape wrapping is uniform and tight. All guide wheels and rods touching the equipment must be smooth, the arrangement line is neat, the tension is not too large, and the side plate and cylinder of the take-up tooling wheel are flat and smooth.
3. For the circular core with axial symmetry, the mica tape is tightly wound in all directions, so the conductor structure of the fire-resistant cable should be used as a circular tight conductor.
Fire-resistant mica tape for fire-resistant cable is a high-performance mica insulation product with excellent high temperature resistance and combustion resistance. The powder mica tape has good softness when it is normal, and is suitable for the main fire-resistant insulation layer in various fire-resistant cables. In the case of open flame combustion, there is basically no harmful smoke volatilization, so the product is not only effective for cables, but also very safe.
How does the mica tape in the fire-resistant cable prevent fire?
Insulation, high temperature resistance and good heat insulation are the characteristics of mica. The main function of the mica tape in the fire-resistant cable:
One is to protect the inside of the cable from external high temperature within a certain period of time,
The second is to make the cable at high temperature, other insulation, protection materials are still able to rely on mica has a certain insulation performance (the premise is not to touch, because this time the performance of the insulation structure may be composed of ashes).
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Application of synthetic mica tape in fire-resistant cable
The application field of fire-resistant cable is gradually expanding, from the original offshore oil platform to aviation, aerospace, navigation, subway, tunnel, commercial building, hospital, dance hall, metallurgy, chemical industry and power plant, etc., which require high fire resistance rating. In recent years, with the maturity of the manufacturing technology of fire-resistant synthetic mica tape, the amount of fire-resistant cables manufactured with it is increasing. As we all know, the refractory mica tape is divided into two categories: *(950-1000 ℃) and B (750-800 ℃).
Refractory mica tape-Refractory insulation
High temperature resistance: synthetic mica belt fluorine gold mica belt, does not contain crystal water, melting point 1375 ℃, safety margin, high temperature resistance is the best, phlogopite releases crystal water above 800 ℃, high temperature resistance is the second, muscovite releases crystal water at 600 ℃, high temperature resistance is poor.
Calculation method of used quantity of polyethylene heat shrinkable winding tape
Heat shrinkable tape (open sleeve) is used to prevent corrosion at the welding place of two steel pipes. What is important is to use a set of heat shrinkable tape for one joint joint. The specifications are divided according to the pipe diameter and the price is sold according to one set. Therefore, a set of heat shrinkable tape will contain all the materials required for this weld joint corrosion protection: main tape; Epoxy primer; Fixing sheet; Adhesive tape.
How much do you know about wire and cable wrapping?
1. protect the insulation or inner sheath layer from damage to the armor when the cable is armored, and play the role of buffer and liner. 2. in the process of cable use, due to different materials on the cable insulation or inner sheath layer from heat insulation, or anti-corrosion, anti-aging and other different effects.
Flame retardant cable is characterized by delaying the spread of flame along the cable so that the fire does not expand. Whether it is a single cable or a bundle of laying conditions, the cable is known to burn when the spread of the flame can be controlled within a certain range, so you can avoid the fire caused by the major disasters, thereby improving the fire level of the cable line.
What is halogen-free flame retardant belt?
Halogen-free flame retardant products with flame retardant level up to UL94-V0 standards, does not contain fluorine, chlorine, bromine, iodine halogen. Low smoke when burning, more environmentally friendly. The product has good self-adhesion, completely self-melting in a short time, no layering, and good sealing. The self-adhesive tape has good ductility, insulation and excellent physical properties.