method for making a collapsible dispensing tube in which plastic fabricating materials other than conventional materials can be selected which are more suitable , since the pressure in the process is increased while the temperature is decreased . this manufacturing method utilizes a locking taper resulting in a better bond between the headpiece , barrier member , and the inner wall of the collapsible tube and substantially eliminating blowby of plastic material into said collapsible tube . the barrier member extends to and is tightly engaged with the adjacent inner wall of the collapsible tube and substantially eliminates bypass of gases around the barrier member . the method of manufacture permits the selection of the most suitable thermoplastic material for the intended use from a group of materials .