Patent ID: 8459500
Filing Date: 2013-06-11
Classification: B29C,B29L,Y10T

Abstract:
1. A container production method, comprising the steps of: providing an external rigid body having a neck defining an aperture giving access to a cavity of said body; providing a preform formed of thermoplastic material, the preform including a neck from which a flange radially extends; heating the preform above a softening point of the thermoplastic material; arranging the preform in the aperture of the body; feeding into an interior of the preform a first air jet which inflates the preform to form a bag which at least partially occupies said body cavity, said bag having walls that are urged into contact with walls defining said body cavity; interrupting said first air jet to enable said thermoplastic material to shrink, with consequent detachment of said thermoplastic material from the walls defining said body cavity, to allow outflow of air compressed by expansion of the bag and trapped between the bag and the walls defining said body cavity; blowing into the bag a final air jet, said final air jet completely inflating the bag so as to cause the bag to come into contact substantially with every point of at least an inner lateral surface of said body cavity; and interrupting the final air jet to facilitate slight shrinkage of the bag which at least partially separates the bag from the walls defining said body cavity.