With the rapid development of modern communication technology, the application field of wire and cable is expanding, and the application environment is more complex and changeable, which puts forward higher requirements for the quality of wire and cable materials. Water blocking tape is currently a commonly used water-blocking material in the wire and cable industry. Its sealing, waterproofing, moisture-blocking and buffering protection functions in the cable make the cable better adapt to the complex and changeable application environment.
The water-absorbing material of the water blocking tape expands rapidly when it encounters water, forming a large-volume jelly, which fills the water seepage channel of the cable, thereby preventing the continuous infiltration and diffusion of water and achieving the purpose of blocking water.
Like the water blocking yarn, the water blocking tape must withstand various environmental conditions during cable manufacturing, testing, transportation, storage and use. Therefore, from the perspective of cable use, the following requirements are put forward for the water blocking tape.
1) The fiber distribution is uniform, the composite material has no delamination and powder loss, and has a certain mechanical strength, which is suitable for the needs of cabling.
2) Good repeatability, stable quality, no delamination and no dust generation during cabling.
3) High swelling pressure, fast swelling speed and good gel stability.
4) Good thermal stability, suitable for various subsequent processing.
5) It has high chemical stability, does not contain any corrosive components, and is resistant to bacteria and mold.
6) Good compatibility with other materials of the cable.
Water blocking tape can be divided according to its structure, quality and thickness. Here we divide it into single-sided water blocking tape, double-sided water blocking tape, film laminated double-sided water blocking tape, and film laminated single-sided water blocking tape. In the process of cable production, different types of cables have different requirements for the categories and technical parameters of the water blocking tape, but there are some general specifications, which UM MUNDO. will introduce to you today.
The water blocking tape with a length of 500m and below shall have no joint, and one joint is allowed when it is greater than 500m. The thickness at the joint shall not exceed 1.5 times of the original thickness, and the breaking strength shall not be less than 80% of the original index. The adhesive tape used in the joint should be consistent with the performance of the water blocking tape base material, and should be clearly marked.
Water blocking tape should be packaged in pad, each pad is packaged in a plastic bag, several pads are packed in large plastic bags, and then packed in cartons with a suitable diameter for the water blocking tape, and the product quality certificate should be inside the packaging box.
Each pad of water blocking tape should be marked with product name, code, specification, net weight, pad length, batch number, manufacturing date, standard editor and factory name, etc., as well as other signs such as “moisture-proof, heat-proof” and so on.
The water blocking tape must be accompanied by a product certificate and a quality assurance certificate when it is delivered.
Products should be protected from moisture and mechanical damage, and should be kept clean, dry, and free from contamination, with complete packaging
Avoid direct sunlight and store in a dry, clean and ventilated warehouse. The storage period is 12 months from the date of manufacture. When the period is exceeded, re-inspect according to the standard, and can only be used after passing the inspection.