RECIPIENT PERFECTIONNE EN MATIERE PLASTIQUE, SON PROCEDE DE FABRICATION, ET APPAREIL POUR LA MISE EN OEUVRE DE CE PROCEDE

摘要

Plastic containers include a shell an open end of which is sealably closed by a closure member having a peripheral hinge portion secured to the shell and so inner expanse which may be bowed axially of the shell. The closure member is unfolding or deformable in drop testing such that sealable closure of the shell is maintained.