In the inspection of the specifications and dimensions of PP-R pipes, the nominal outer diameter, average outer diameter and wall thickness of the pipes have failed. The qualification of the nominal outer diameter and the average outer diameter will affect the application and construction quality of the pipe. The pipe with unqualified specifications and dimensional specifications shall not be well connected with the pipe fitting, and may reduce the compressive strength of the joint, leaving the pipe broken and Hidden danger of leakage. The quality of the wall thickness will also affect the physical and mechanical properties of the pipe.
(1) Causes
In the process of extrusion molding and adding soil in PP-R pipe, the proper control of the vacuum degree during vacuum setting will directly affect the dimensional accuracy of the pipe. The degree of vacuum is too low, the adsorption force on the tube blank is insufficient, and the tube blank is easily deformed, which causes an error in the nominal outer diameter, the average outer diameter, and the wall thickness of the tube.
Extrusion and traction speed directly affect the wall thickness and dimensional tolerance of the pipe. Extrusion and traction speed is too fast, resulting in negative wall thickness error, extrusion and traction speed is too slow, resulting in positive wall thickness error.
(2) Control measures
The vacuum setting of the vacuum setting is adjusted and stabilized at an optimum value, and the control of the degree of vacuum is closely related to the degree of sealing of the vacuum chamber and the performance of the vacuum pump.
Control eliminates the instability of the extrusion system and ensures accurate and constant extrusion and traction speeds.
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