COEXTRUSION FEEDBLOCK FOR MAKING LIGHTWEIGHT, RIGID THERMOPLASTIC PIPE

摘要

COEXTRUSION FEEDBLOCK FOR MAKING LIGHTWEIGHT, RIGID THERMOPLASTIC PIPE Coextrusion feedblock apparatus for making multilayer, lightweight pipe wherein means are provided to convert thermoplastic material into pipe or tubing having a plurality of layers. Means (12,28) are provided for adjusting the feedblock apparatus to assure thickness uniformity of the inner layer of the pipe or tubing and further, means (13,30) are provided for adjusting overall wall thickness of the multilayer pipe or tubing.