Collapsible tube package and method of construction

A method of constructing a tube package comprising the steps of:

• a) generating a tubular body, said tubular body having a first open end and a second open end;
• b) generating a tube head having an inner shoulder surface, an outer shoulder surface, and a perimeter edge;
• c) locating said tube head on a mandrel having an anvil surface which fits against said inner shoulder surface;
• d) positioning said mandrel and said tube head inside said first open end of said tubular body such that a continuous wall portion of said tubular body extends longitudinally beyond said perimeter edge of said tube head to form an extended wall portion;
• e) swaging said extended wall portion inwardly against said outer shoulder surface of said tube head to form a swaged end of said tubular body, said tube head being supported by said anvil surface of said mandrel;
• and
• f) ultrasonically welding said swaged end of said tubular body to said outer shoulder surface of said tube head in order to close said first open end of said tubular body, and melting an energy concentration ring, which extends longitudinally from said outer shoulder surface of said tube head, into a sealing interface between said swaged end and said outer shoulder surface;
• said swaging and said ultrasonic welding steps occuring in one operation by a common tool in direct contact with said extended wall portion.