Analysis of Causes for Uneven Thickness of Anti-corrosion Coating on SSAW Steel Pipe

As the epoxy powder dipping process is plagued by the problem of adhesion, the impregnation of epoxy powder has not been promoted. Currently, with the successful development of the special phosphating solution for Sancha epoxy powder dipping, the adhesion problem of the epoxy powder dipping process has been overcome for the first time, and the emerging process of epoxy powder dipping began to emerge.

The reason for the uneven thickness of the coiled anticorrosive coating is that the thickness of the 3PE spiral coating is not uniform. The thickness of the test points on each side of the circumferential distribution is now uneven. There is no rule for thickness uniformity in the industry specification SY/T 0413-2002, which stipulates the minimum thickness of the coating, but the minimum thickness of the coating must not be lower than the thickness of the lowest point, not the multiple test points. average value.

If the thickness of the coating is uneven during the coating process of the SSAW steel pipe

, it will inevitably result in the spoilage of the butcher data. This is because when the coating thickness at the thinnest part reaches the minimum specification, the thickness of the thick part will be greater than the thickness of the coating. The thickness of the coating specification. In the uneven coating condition, the thickness of the coating layer at the thinnest portion of the steel pipe can not be standardized. In the process of production, there are several reasons for the uneven thickness.

A useful way to control the uneven distribution of 3PE anticorrosive pipe coatings is to adjust several extrusion dies so that the thickness of the anticorrosive coating at several places is as uniform as possible, and the failure of the unqualified carbon steel pipe to be applied on the line is a strategy.

Coating appearance wrinkles: The extrusion of polyethylene material onto the steel tube requires the rolling of the silicone roll. Improper adjustment during this process may cause the coating surface to extrude wrinkles. In addition, in the process of extrusion of polyethylene materials, the breakage of the melt film when leaving the outlet die also occurs mass defects similar to wrinkles. For the edge of the wrinkle, the corresponding control method has to adjust the hardness and pressure of the rubber roller and the pressure roller. From the point of view, the appropriate amount of extruded polyethylene controls the breakage of the melt film.

A worker from a steel pipe company, which is located in China.