Polypropylene container and process for making it

摘要

Polypropylene containers, preforms, methods and stretchrods used in making them are disclosed. A method of reheating a preform for stretch blow molding the preform defining a 5 longitudinal axis and comprising a finish and a preform blow section comprising a neck extending from the finish, a sidewall extending from the neck and a base closing the blow section, the base having a portion of increased thickness defining a thickness greater than all other portions of the blow section, the method of reheating comprising exposing the preform blow portion to a plurality of reheat bulbs to elevate the temperature of the preform blow 10 portion, an outer skin of the preform base portion of increased thickness being exposed to heating rays by substantially by only one bulb is also disclosed.