What is Water Blocking Tape?
What is Water Blocking Tape?
Blog Article
What is cable water blocking tape? A water blocking tape for cables and optical cables. It characterized by: it includes a strip-shaped substrate layer with tensile and temperature resistance and a high-rate water-absorbing material layer uniformly attached to the substrate layer. The two layers can combined by bonding, coating, dipping and other methods. They are thin and have a high water absorption rate.
Water blocking tape swell rapidly when exposed to water, fill the gap between the cable cores. And have a good longitudinal water blocking effect. They also have good tensile strength and thermal stability, and not affected by high temperature environments. The high-rate water-absorbing material evenly and firmly combined with the substrate. And there is no problem of peeling and delamination of the covering layer. It effectively avoids the occurrence of “mold blocking”, “cable breaking” and “mold jamming” accidents. And it does not shed powder or stick during use, the production process is simple, the technical performance is stable, and the practicality is strong.
In communication cables, mechanical pressure during laying or maintenance. Defects in the insulation layer and damage to the cable joints will lead to water infiltration. Especially in the sheath, due to the capillary phenomenon, water will spread longitudinally along the cable axis. This causes signal noise in the communication cable. The same problem also exists in the optical cable. This affects the signal transmission of the optical cable and reduces the communication quality.
To solve the above problems and ensure the safe operation and extended service life of cables and optical cables. Cable water blocking tape usually used to solve it, but it is cumbersome to process and has poor waterproof effect. Therefore, expansion water-blocking tape for cables has appeared. The common structure of water-blocking tape is to cover a layer of water-absorbing material. The covering layer generally composed of a base material layer, an expansion layer, a water-absorbing layer, and a covering layer. There are as many as 3 to 4 layers. However, after adding the covering layer, it cannot meet the requirements of filling the gap of the cable core, and often causes accidents. Such as “blocking the mold”, “stuck the mold”, and “cable breaking” in the manufacture of cables and optical cables due to the peeling of the covering layer. And its thickness is large, which is not conducive to reducing the structure of cables and optical cables. The water-blocking tape produced and developed by TOEM not only reduces the thickness of the water-blocking tape because it omits the covering layer, but also can block water longitudinally. It can also meet the requirements of filling the gap between cable cores and reduce the structure of electrical cables and optical cables.