(1)3PE external anti-corrosion production process and production line basic parameters From the 3PE external anti-corrosion production process sequence, the staff should follow the following steps to implement:according to the nature of the steel pipe preheating work, and to test whether its shape is good; The temperature should be adjusted according to the actual production situation, the treatment frequency of the coating should be fixed, and the powder spraying should be used. Wrap the adhesive around the steel pipe, wait for the reagent to condense, and add 25% polyethylene in it to enhance the overall performance of the coating. The steel pipe is placed in cold water, and the hole is eliminated by means of electric spark, the basic energy of the coating is checked, and then the label is affixed to the steel pipe, and all the processes are completed.

(2)3PE production key technology 3PE production key technology has the characteristics of flexibility and diversification. The staff should handle it according to standard procedures to ensure that the performance of the anti-corrosion layer is better. The surface of the steel pipe is coated with the treatment technology to be used. According to the performance of the steel pipe, the paint is divided into three parts, and the dust removal equipment is used to clean the surface of the steel pipe to achieve the purpose of pretreatment. In general, the workers will choose the shot blast rust remover to absorb granular dust, and use the high-power dust processor to control the cleaning process; The method of medium frequency heating is used to control the preheating installation. In this process, the heat should be evenly sprayed to the surface of the steel pipe and reflected in the rate. Three-layer anticorrosive layer forming technology. As the core processing part of the anti-corrosion layer, the staff should complete the construction of the coating level while ensuring the appearance of the steel pipe.

Quality control of 23PE external anti-corrosion layer

(1)3PE coated pipe surface pitting and bubbles between coatings As far as 3PE coated surface pitting is concerned, it is mainly manifested in the following aspects:due to the slow running speed of polyethylene material molecules, it is easy to volatilize under high temperature firing, and the degree of adhesion of small molecular components becomes higher, and it is not easy to evenly lay on the surface of the steel pipe; Secondly, under the influence of medium frequency temperature, the plasticizing time will be shortened, and reasonable control by the staff is required to ensure the quality of the product; From the point of view of the bubbles between the coatings, it is mainly due to the excessive use of binder in the steel pipe, which increases the moisture inside the material and leads to bubbles between the coatings. In addition, if the staff does not choose a reasonable Angle of the silicone stick, it will also increase the hardness of the paint;

(2) The water impact point on the surface of the coating and the uneven thickness of the coating the high-temperature coating on the steel pipe should be cooled by condensation water. The staff need to spray cold water evenly on the surface of the steel pipe. However, because the heating area of the coating is different, the position is not the same, and the water impact point is presented in an uneven situation, which requires the control of the worker to make the flow distance reasonable; At the Angle of uneven thickness of 3PE coating, as long as the cause is improper production method. The exit of the paint mold is at the upper and lower ends, and if the coating can not be evenly spread in the distribution control points around the steel pipe, there will be material waste and lead to unqualified quality.
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