Es por un proceso llamado extrusión,se realiza a entre entre,90,hasta 180 grados de temperatura,para realizar que el pvc,o polietileno logre ponerse homogéneo,y adi poder realizar el tubo u otro producto a realizar,y su proceso de enfriamiento se realiza con agua.
Was a class A Extruder operator for several years ,Q.C.P. , CHARLOTTE PIPE , IMPERIAL FIRE HOSE . and set up a twin screw extrusion plant for J.WALL. INC. profile extrusion from ground up , including using laths and machining the DIE HEADS. For all the different profiles . Love that work. Oh and I forgot there was one other ANGUS INC. and trained Haitians that was brought to this country to learn extrusion so they could go back and set up there own plant in Hadees. Dang I'm feeling old now l.o.l.
Did my share of this bit in a different form was a pita. If you had to leave the line, the damn vacuum seemed to take a break too, causing to have to re-string.