Anti-corrosion steel pipe anticorrosion coating thickness uneven analysis reason, 3 PE anticorrosive steel pipe coating thickness uneven first table now circumferential direction spread each side of the uneven thickness of the test points. In the industry standard SY/T0413-2002 on the thickness uniformity without rules, the rules of the minimum coating thickness value, but it requires the minimum thickness of the coating cannot under the thickness of the low value, rather than the average multiple test points.
Anti-corrosion steel pipe coating if uneven thickness of coating process, will form the butcher data of abuse, this is due to ensure the coating thickness of the thinnest place arrived at minimum specifications, the thickness of the thick part will be larger than the thickness of the coating specification. Moreover, the coating thickness of the steel pipe is less than the norm in the case of uneven application. The reason of the uneven thickness of the production process is that there are several points of uneven material and the steel pipe bending. Manipulation of the 3 PE anticorrosion pipeline coating the condition of uneven useful method is to adjust a few mouth extrusion die several anticorrosive coating thickness as evenly as possible, unqualified steel tube is not the way such as online coating strategy.
Coating appearance wrinkles: polyethylene material extrusion wound to the steel pipe demand on silica gel of roller pressure, improper adjustment may be in the process of the squeeze creases coating appearance. In addition, polyethylene material extrusion process from melt membrane rupture can occur when an export mode similar to ruffle quality defects, the cause of the corresponding control measures for causing creases have adjust the rubber roller hardness and the perspective of pressure and pressure roller, appropriate adding PE extrusion amount control membrane rupture.
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