Device for moulding a plastic component having at least one undercut

1. 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.

2. The device according to claim 1 , characterized in that at least one movable insert is disposed in the movable block.

3. The device according to claim 1 , characterized in that the device comprises, in addition, means for controlling an opening position of the movable block relative to the fixed block comprising a movable base plate which can take an opening position of the device, configured to cause the separation of the movable block and to retract a retaining member controlling an opening of the mold in its second volume.

4. The device according to claim 3 , characterized in that the retaining member pivotally mounted on the fixed block includes a protruding portion intended to be engaged into a notch formed in the movable block, the notch and the protruding portion being configured to enable the separation of the movable block relative to the fixed block by a predefined distance so that the molding recess passes from the first volume to the second volume.

5. The device according to claim 1 , wherein the thrust means comprises first cylinders, such as hydraulic springs or mechanical springs.

6. The device according to claim 1 , wherein the means for separating comprises cylinders, such as hydraulic springs or mechanical springs, interposed between the movable block and the fixed block.

7. The device according to claim 1 , wherein the fixed block comprises, at least, one rising wedge driven by the movable insert along the main demolding direction during passage from the first volume to the second volume and then returns to its secondary direction during the full opening of the molding device.

8. The device according to claim 1 , wherein the fixed block comprises at least one drawer driven by the movable insert along the main demolding direction during passage from the first volume to the second volume and then returns to its secondary direction during the full opening of the molding device.

9. The device according to claim 2 , characterized in that the device comprises, in addition, means for controlling an opening position of the movable block relative to the fixed block comprising a movable base plate which can take an opening position of the device, configured to cause the separation of the movable block and to retract a retaining member controlling an opening of the mold in its second volume.

10. The device according to claim 9 , characterized in that the retaining member pivotally mounted on the fixed block includes a protruding portion intended to be engaged into a notch formed in the movable block, the notch and the protruding portion being configured to enable the separation of the movable block relative to the fixed block by a predefined distance so that the molding recess passes from the first volume to the second volume.

11. The device according to claim 10 , wherein the thrust elements comprise first cylinders, such as hydraulic springs or mechanical springs.

12. The device according to claim 11 , wherein the separation means further comprise cylinders, such as hydraulic springs or mechanical springs, interposed between the movable block and the fixed block.

13. The device according to claim 12 , wherein the fixed block comprises, at least, one rising wedge driven by the movable insert along the main demolding direction during passage from the first volume to the second volume and then returns to its secondary direction during the full opening of the molding device.

14. The device according to claim 13 , wherein the fixed block comprises at least one drawer driven by the movable insert along the main demolding direction during passage from the first volume to the second volume and then returns to its secondary direction during the full opening of the molding device.

15. The device according to claim 2 , wherein the fixed block comprises, at least, one rising wedge driven by the movable insert along the main demolding direction during passage from the first volume to the second volume and then returns to its secondary direction during the full opening of the molding device.

16. The device according to claim 2 , wherein the fixed block comprises at least one drawer driven by the movable insert along the main demolding direction during passage from the first volume to the second volume and then returns to its secondary direction during the full opening of the molding device.