PROCEDIMENTO ED APPARATO PER FABBRICARE CORPI TUBOLARI,IN PARTICOLARE PER IMBALLAGGIO,FORMATI DA MATERIALE COMPOSITO A PIU' STRATI

摘要

For producing a tubular body from a blank of sheet material of which the opposite faces, at least adjacent respective opposite lateral margins of each face are made of mutually weldable thermoplastic material, the blank having a central section, and two opposite flanks which respectively have said opposite lateral margins distally of the central section.