Process for producing glass fiber reinforced plastic pipes having every section and sandwich structured

摘要

The method for making glass fiber reinforced pipes comprises forming an inner shell (1) by winding polymer-impregnated fiber strips in a spiral over a mandrel. A foam layer (2) is then sprayed on and finally an outer shell (3) is applied in the same way as the inner shell. An annular groove is formed in the end face of the pipe and one of the shells projects beyond the face. An independent claim is included for pipes produced by the method.