Patent ID: 9676140
Date: 2017-06-13
CPC Classifications: B29C

Claim:
1. A method of manufacturing a container from a blank of plastic material, using a mold provided with a wall defining a cavity with an impression of the container, and a mold bottom that is movable with respect to the wall between a retracted position in which the mold bottom extends retracted with respect to the cavity, and a deployed position in which the mold bottom extends protruding into the interior of the cavity in order to form a hollow recess in the container, the method comprising: an operation of inserting the blank into the mold; a pre-blowing operation comprising injecting a fluid under pressure into the blank, at a pre-blowing pressure, a blowing operation, consecutive to the pre-blowing operation, comprising injecting a fluid under pressure into the blank at a blowing pressure that is greater than the pre-blowing pressure; and a boxing operation comprising moving the movable mold bottom from retracted position to the deployed position to push a bottom of the container as the movable mold bottom moves and shapes the bottom of the container; wherein the pre-blowing operation and the blowing operation are carried out in the mold and wherein the boxing operation is initiated prior to the blowing operation, and wherein the boxing operation occurs during the blowing operation.