Patent ID: 6521155
Filing Date: 2003-02-18
Classification: B29B,B29C,B29K,B29L,F16L,F23J,Y02W,Y10S

Abstract:
A process for manufacturing plastic pipe from a recycled, crushed PET starting material comprising:providing a source of recycled, crushed PET starting material; feeding the starting material to a kneading unit; kneading the starting material under the influence of heat and removing moisture from the kneading unit to prevent hydrolysis and to form a homogenous, substantially moisture free, process viscous mixture; feeding the viscous mixture to an extruder; and providing the extruded mixture to a corrugator while cooling at a temperature gradient of between âˆ’10Â° C./min and âˆ’50Â° C./min so as to form a crystalline plastic pipe.