Molding unit for containers, equipped with a boxing insert with air circulation

Molding unit (1) for the forming of a container (2) provided with a hollow recess (3) toward the interior of the container (2), this forming unit (1) comprising:

• a mold (5) provided with a lateral wall (6) defining a cavity (7) having the impression of at least one portion of the container (2) and that extends along a main axis (X) defining a vertical direction, this lateral wall (6) being provided with a pocket (9) that comes out into the cavity (7);
• a boxing device (11) comprising:
• an insert (12) mounted in translation relative to the lateral wall (6) along a transverse axis (T) defining a radial direction, between a retracted position in which the insert (12) is at least partially retracted in the pocket (9), and a deployed position in which the insert (12) projects at least partially into the cavity (7) outside of the pocket (9),
• an actuator (16) integral with the insert (12) and provided with a piston (17) mounted in translation along the transverse axis (T):
• wherein:
• the insert (12) is provided with at least one passage (81) that extends from one rear end (82), by which it opens into the pocket (9), to a front end (83) by which it opens onto a front face (13) of the insert (12);
• the piston (17) is mounted in a chamber (22) defined in the wall (6) of the mold (5), the piston (17) subdividing the chamber (22) into a rear half-chamber (22A) in communication with a primary fluid duct (46), and a front half-chamber (22B), in communication with both a secondary fluid duct (50), as well as the pocket (9).