Injection stretch blow molded tubular containers

摘要

Tubular containers can be produced by injection stretch blow molding processes. Such processes comprise the biaxial stretching of the preform as the preform is being converted into the tubular container. The preform will be stretched longitudinally by means of a stretch rod and laterally by means of the pressure of the blowing gas. The tubular containers produced by these processes will have burst strengths three to five times that of other tubular containers and can be produced in a thin wall collapsible form. Further, the tubular containers can be single chamber containers or multi-chamber containers. The tubular container preform is stretched longitudinally and laterally to a total orientation of more than about 6, is of a collapsible material, has a wall thickness of less than 250 microns, has a burst strength of more than 7 kg/cm2 and has a Strength Factor calculated in accordance with the equation: Strength Factor = Burst Strength (kg/cm2) divided by Wall Thickness (microns), of 0.05 to 0.5.