METHOD OF AND DEVICE TO CONTROL PROCESS OF ORIENTATION OF PLASTIC PIPES

摘要

FIELD: production of orientated plastic pipes. ^ SUBSTANCE: invention relates to method of continuous manufacture of orientated plastic pipes including making of pipe by extrusion with initial diameter provided at extrusion, creating required temperature conditions, expanding pipes in diametral direction and cooling. Extension in circumferential direction is provided by adjusting diameter of extruded pipe to preset diameter by means of calibrating device with adjustable diameter, extension being carried out between said extrusion operations and creating required temperature conditions. Invention contains description of process line for implementing the method. Additional versions of invention include adjustment of thickness of well of extruded pipe and compensation for set diameter to change final thickness of wall at constant degree of extension, method of hanging final diameter of article and initial stage of process. ^ EFFECT: provision of new method and device to control and adjust process of manufacture of orientated pipes and properties of produced orientated pipe. ^ 18 cl, 6 dwg