Device for moulding a plastic component having at least one undercut

A device for molding a plastic part from a plastic material including a solubilized gas, characterized in that the device comprises:

• a mold having a fixed block comprising a first half-cavity and a movable block comprising a second half-cavity, the fixed block and the movable block being joined at a parting plane and the first and second cavities delimiting a molding recess designed to receive the plastic material, having a first volume and presenting a main demolding direction,
• means for separating the movable block relative to the fixed block, allowing making the molding recess pass from the first volume to a second volume;
• at least one movable insert disposed in the fixed block carrying at least one movable element, thrust means urging the movable insert in the direction of the movable block, the thrust means being configured so that the movable insert moves during the separation of the movable block between the first volume and the second volume, and the movable insert keeps constant the separation between the second half-cavity formed in the movable block and the movable element(s) carried by the movable insert,
• means for displacing the movable element(s) in a secondary direction non-parallel to the main demolding direction during a full opening.