Improvements in the heads of the machines intended for the manufacture of plastic material tubes, formed by two layers obtained in the same extrusion process. (Machine-translation by Google Translate, not legally binding)

摘要

Perfeccionamientos in the cabezales of the machines destined to the manufacture of tubes of plastic material, formed by two layers obtained in himself same process of extrusion, that consist in the provision of a conduit of blowing of air independent of the central nozzle that injects it to the tube already finished, whose duct occupies an eccentric and intermediate position in the head with respect to the two annular extrusion channels, so that the air injected therethrough keeps the two layers of plastic material separated from the extrusion head., during the suitable time to avoid irregularities in the formation of the unitary wall of the tube. (Machine-translation by Google Translate, not legally binding)