Preform of a plastic container particularly designed for packaging foodstuffs

摘要

This invention relates to the preform to produce a plastic container for packaging foodstuffs, and especially to blow mould thin-walled containers which can be hermetically closed with a metal lid by double seaming. The preform ( 1 ) includes a body ( 4 ) and a convex hemispherical bottom ( 6 ). The body ( 4 ) has a conical shape that flares towards a cylindrical neck ( 2 ) surrounded by a flange ( 3 ) that terminates in a thickened rim ( 5 ). Preferably, the angle (alpha) at which the internal body surface ( 4 ) flares towards the cylindrical neck is greater than the angle (beta) at which the external body surface ( 4 ) opens upwards, and the thickness (g 2 ) of the cylindrical neck ( 2 ) is less than the thickness (g 3 ) of the bottom ( 6 )