Method and device for forming containers using a ventilated boxing insert

A device for forming a container from a blank, which comprises:

• A mold provided with a wall defining a cavity;
• A boxing insert movably mounted with respect to the wall of the mold between a retracted position in which the insert is retracted into the wall, and a deployed position in which the insert protrudes with respect to the wall, toward an interior of the cavity, in order to form on the container, by pushing back, a hollow reserve projecting toward the interior of the container, said insert having a front surface configured to come into contact with the hollow reserve;
• A system for injecting a pressurized fluid, formed at least partially in the insert and opening onto the front surfacer;
• and
• a compensation chamber for the evacuation of the pressurized fluid.

A device for forming a container, which comprises:

• a mold provided with a wall defining a cavity;
• a blank in the cavity;
• a boxing insert movably mounted with respect to the wall of the mold between a retracted position and a deployed position in which the insert protrudes from the wall toward an interior of the cavity in order to form on the container a hollow reserve projecting toward the interior of the container, the insert having a front surface configured to contact the container in forming the hollow reserve;
• a fluid injection system configured to deliver pressurized fluid in the cavity between the insert and the hollow reserve;
• and
• a compensation chamber for the evacuation of the pressurized fluid.