1. There are three kinds of mica tapes, synthetic mica, phlogopite,  muscovite. Their respective quality properties are that of synthetic mica  poor muscovite. For small-sized cables, synthetic mica tapes must be selected for wrapping,  mica tapes cannot be layered. In use, mica tapes stored for a long time are easy to absorb moisture, so the temperature  humidity of the surrounding environment must be considered when storing mica tapes.Guangxi cable manufacturer

2. When selecting the mica tape wrapping equipment, it should be used with good stability,  the wrapping angle should be 300--400 degrees. The mica tape wrapping is even  tight. The thread is neat, the tension is  easy to be too large,  the side plate  cylinder of the thread take-up wheel are flat  smooth.

3. For the circular core with axial symmetry, the mica tapes are tightly wrapped in all directions, so the conductor structure of the fire-resistant cable should be a circular compact conductor. The reason is as follows:

①Some users propose that the conductor is a bundled flexible structure conductor, which requires the company to communicate with users  the reliability of cable use to a circular compacted conductor. The flexible structure bundled wire  multiple twisting easily lead to damage to the mica tape, which is used as a fire-resistant The cable conductor is  desirable, but some manufacturers think that what kind of fire-resistant cable the user needs, the manufacturer should meet the user's needs. I think that the user does  fully understand the details of the cable after all,  the cable is closely related to human life. , so cable manufacturers must clarify relevant technical issues to users.

②The fan-shaped conductor should  be used either, because the wrapping pressure of the mica tape on the fan-shaped conductor is unevenly distributed. Because mica is a sheet-like silicate polymer, its interlayer molecular attraction is much weaker than the bond force of the s1-0 covalent bond within the crystal. It is easy to slide between layers  is bonded by silicon, but the bonding strength is also low. It is very easy to fall off  crack when scraped  squeezed by external force. When the wire rods  cables reach the edge of the side plate of the tooling wheel,  when the insulation is extruded into the mold core in the subsequent process, it is easy to be scratched  bruised, resulting in a decrease in electrical performance. In addition,  the perspective of cost, the perimeter of the section of the fan-shaped conductor structure is larger than the perimeter of the section of the circular conductor, thereby adding mica tape, a precious material, although the outer diameter of the cable with the circular structure is increased. The amount of PVC sheathing material has increased, but compared with the total cost of product materials, the round structure cable is still economical in terms of comprehensive cost.Guangxi cable

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