With the constant demand for polyethylene anti-corrosion tape, some manufacturers have sold some unqualified polyethylene anti-corrosion tapes to consumers for the sake of temporary benefits. How can consumers avoid these unqualified products when purchasing? Polyethylene anti-corrosion tape? What aspects should be judged by the quality of the anti-corrosion coating of polyethylene anti-corrosion tape?
How to judge the quality of polyethylene anti-corrosion tape anti-corrosion layer
1. Since the steel pipe absorbs heat, and the black color of the polyethylene anti-corrosion tape is more endothermic, the pipe body is prohibited from exposure after anti-corrosion, and should be stored according to requirements. If the normal temperature is 20 ° C, the temperature of the steel pipe must be above 30 ° C, which is contrary to the standard and construction requirements.
2. When the weather is hot or the sun is sunny, the entangled polyethylene anti-corrosion tape often has bubbles. Since the tape itself has a certain elasticity and self-repairing ability, these bubbles can disappear by themselves, so this situation should not be regarded as a quality problem. If long-lasting bubbles are produced, like wrinkles, they should be removed.
3. If the construction air humidity is high, the temperature difference and other columns cause water vapor on the surface of the steel pipe, after the polyethylene anti-corrosion tape is wound, and because the sealing property of the tape is relatively good, the water vapor can not penetrate the anti-corrosion layer for a long period of time. Causes bubbles to form. As long as you pay attention to the construction, this problem can be avoided.
4. Check to see if the coating of the primer is sufficiently uniform and continuous, and there are no defects such as leakage coating, flow marks, etc. Moreover, it is necessary to carry out the winding adhesive tape until the primer is sufficiently dry.
5. The thickness of the polyethylene anti-corrosion tape can be detected by using a non-destructive thickness measuring instrument. Randomly select a plurality of pipes by random sampling to check two or three places, and each point is evenly distributed along the circumference to measure four points, if not If it is qualified, it will be checked again. If one of the two fails, it will be judged as unqualified.
6. Use the electric spark leak detector to conduct continuous leakage inspection of the anti-corrosion pipe, and pass the no-drop condition as qualified.
7. Peel strength testing of polyethylene anti-corrosion tape, and the anti-corrosion coating with a width of 10 mm and a length of more than 100 mm in the circumferential direction of the tube should be completely drawn until the tube body. Pick up one end, clamp this end, and use a spring balance and demand pull direction to form a 90 degree angle with the pipe wall, the opening rate is not more than 300 mm / min.
In the visual inspection of the polyethylene anti-corrosion tape, the joints and repairs should be inspected one by one. The surface of the anti-corrosion layer should be flat, evenly overlapped, no wrinkles, no permanent bubbles, no damage.
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