Mold with a moving joint face for making a plastics material piece, and a method using such a mold

A method of making a plastics material piece, using a mold comprising:

• a first part having a first peripheral zone;
• a second part configured for receiving a sheet, said second part comprising:
• a central block being configured to form with the first part a cavity for making the piece;
• a peripheral block having a second peripheral zone, said first and second peripheral zones, when in contact, defining a joint face of the mold, said peripheral block being suitable for sliding relative to said central block in a mold closure direction so as to move the second peripheral zone away from edges of the sheet;
• wherein the method comprises:
• placing a sheet having edges for incorporation or overmolding in the piece that is to be made in the second part of the mold;
• moving the peripheral block so as to move the second peripheral zone away from the edges of the sheet;
• closing the mold by bringing the first peripheral zone into contact with the second peripheral zone such that the sheet is not pinched in the joint face;
• and
• moving the peripheral block to a molding position while keeping the first and second peripheral zones in contact.

A method of making a plastics material piece, using a mold comprising:

• a first part having a first peripheral zone;
• a second part configured for receiving a sheet, said second part comprising:
• a central block being configured to form with the first part a cavity for making the piece;
• a peripheral block having a second peripheral zone, said first and second peripheral zones, when in contact, defining a joint face of the mold, said peripheral block being suitable for sliding relative to said central block in a mold closure direction so as to move the second peripheral zone away from edges of the sheet, said peripheral block having holding rods,
• said method comprising:
• placing a reinforcing sheet having edges for incorporation or overmolding in the piece to be made in the second part;
• moving the peripheral block to move the second peripheral zone away from the edges of the reinforcing sheet;
• bringing the holding rods against the reinforcing sheet;
• retracting the holding rods;
• closing the mold by bringing the first peripheral zone into contact with the second peripheral zone such that the sheet is not pinched in the joint face;
• and
• moving the peripheral block to a molding position while keeping the first and second peripheral zones in contact.