Water blocking yarn, as the name implies, can stop water. But have you ever wondered if yarn can stop water? That’s true. The water-blocking yarn is mainly used for the covering protection of cables and optical cables. It is a yarn with strong absorptive capacity and can prevent water from entering the interior of the cable on the outer wall of the communication cable or optical fiber cable. The appearance of the water-blocking gauze has overcome the shortcomings of the traditional water-blocking measure of optical cable – oil paste water blocking. So, in what way does the water-blocking yarn block water?
Water-blocking yarn is mainly composed of two parts: first, the base material is composed of nylon or polyester reinforcement, which can make the yarn have good tensile strength and elongation; The second is the expanded fiber or expanded powder containing polyacrylate.
The water-blocking principle of the water-blocking yarn is that when the main body of the water-blocking yarn fiber meets water, it can rapidly expand to form a large volume of gel. The water-holding capacity of the gel is quite strong, which can effectively prevent the growth of the water tree, so as to prevent the water from continuing to penetrate and spread, so as to achieve the purpose of water blocking.
Cables and optical cables are usually laid underground in wet areas, and once the cable is damaged, water will enter the cable from the damaged point. For optical cables, if water is frozen in the cable, it will exert too much pressure on the optical components, which has a great impact on the transmission of light.
Therefore, the water resistance performance of optical cable is an important assessment index. In order to ensure water resistance performance, each process of optical cable manufacturing will introduce materials with water resistance function, and one of the commonly used materials is water resistance yarn.
However, there are many problems in the use of traditional water-blocking yarn, such as moisture absorption, powder loss, difficult storage, etc. These problems not only increase the cost of use but also limit the promotion and use of water-blocking yarn in optical cable.
Therefore, in order to ensure that the cable can work normally and withstand the test of various environmental conditions, the use of water-blocking yarn in the cable must have the following characteristics:
1. Smooth appearance, symmetrical thickness, soft texture;
2. Can meet the tension requirements of cable formation, with a certain mechanical strength;
3. Fast expansion speed, good chemical stability and high strength of gels formed by water absorption;
4. Does not contain any corrosive components, good chemical stability, resistance to bacteria and mold;
5. Good thermal stability, good weather resistance, suitable for various subsequent processing and various use environments;
6. Good compatibility with other materials in the cable.
Finally, the application of water-blocking yarn in optical cable realizes the dry-type water blocking of optical cable, which has many advantages compared with the past use of oil paste water blocking, such as optical cable weight reduction, optical cable connection, construction and maintenance convenience, etc., which not only reduces the water blocking cost of optical cable, but also truly realizes the environmental protection production of optical cable.
Post time: Sep-25-2024