An injection blow molding method for making a container comprising the steps of injecting a molten crystallizable polymer in a preform mold via a hot runner system and biaxially stretching the preform by blowing, thereby forming a container, characterized in that said method further comprises means to selectively modify the flow path of the molten crystallizable polymer within the hot runner system.

A container made by blow molding out of crystallisable polymers having regular sequence of variations in molecular pre-alignment/orientation between different locations of the cross-section of the preform.

A container made by blow molding out of crystallisable polymers having regular sequence of variations in molecular pre-alignment/orientation between different locations of the cross-section of the preform.

A preform suitable for blow molding made out of crystallizable polymers made by biaxially stretching the preform by blowing to form a container. The preform having regular or irregular sequence of variations in molecular pre-alignment/orientation and regular or irregular sequence of variations in crystallinity between different locations of the cross-section of the preform.