The pull mechanism is one of the main devices of the extrusion line and is intended to remove the product from the forming head and move it through the cooling bath. If the melt is removed at a rate higher or lower than the melt exit rate, there will be a change in the pipe wall thickness and the pipe axial orientation. Longitudinal strength and transverse directions change. The precise and sensitive operation of the pull mechanism depends on many factors (slip, vacuum pressure, line length,

more »

... volume of raw materials produced by the extruder, etc.). The article examines each factor influencing the operation of the pull mechanism and a system for the passive control of maintaining the precise thickness of the pipe has been developed by correcting the speed of the pull mechanism and warning of deviations in the thickness of the pipe during production.