Polyethylene tape coating quality inspection

by:Yourijiu     2021-02-03
Generally when to use the product in order to ensure the quality of the products, will be carried out in a certain examination, polyethylene tape is no exception, of course, for the sake of its anticorrosive coating adhesive tape in use can make corresponding use effect, will check on the quality, the adhesive tape coating quality inspection is divided into process quality inspection and anticorrosive pipe inspection, what is the specific? We look together. < br />
1, the steel pipe surface treatment quality should not below SA2. 5 or ST3 level, metal surface clean, no dust. < br />
2, check whether polyethylene tape seam in the process of winding parallel, glue sticks with distortion, fold, if there is a cock with end. < br />
3, check whether the primer coating is uniform continuous, no defects such as leakage besmear, flow mark, whether primer to table dry before wrapping tape. < br />
anticorrosive pipe inspection mainly include the following: < br />
1, the leakage check. Electricity spark leak detector to continuous inspection by root, anticorrosive pipe without funnelled as qualified. < br />
2, a visual inspection. Polyethylene tape shall be smooth, uniform pressure side, without persistent bubbles, fold and damaged. Reserve anticorrosive pipe length conforms to specified requirements. < br />
3, the thickness of the inspection. Using nondestructive thickness measuring instrument for testing, every 20 1 root tube sampling, each random sample 3, 4 o 'clock every place is uniformly distributed along the circumference measurement, unqualified another two root of spot check, if one root is unqualified, is judged not qualified. < br />
4, polyethylene tape peel strength test. Along the pipe circumferential direction with a knife slit width 10 mm, length is greater than 100 mm of anticorrosive coating, should be thoroughly until the pipe body. Pry up one end and in the end, with the spring balance and demand pull direction and tube wall form an Angle of 90 degrees, open rate not greater than 300 mm/min. < br />
that is polyethylene tape coating quality inspection methods and steps, we can at the time of inspection through the above methods to the corresponding inspection, after a certain understanding, we at the time of purchase, be sure to check the quality of the products are in good condition, and when to use will be carried out in accordance with the corresponding specification operation, which can effectively avoid some possible problem, reduce some unnecessary loss. < br />
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