Patent ID: 8820391

Claim:
A mould having a vent, wherein the vent comprises: a cylindrical body provided with a plurality of grooves ( 16 ) having an inclination A, with a larger section of the groove ( 18 ) located on an external surface of the vent ( 15 ) and a smaller section of the groove ( 19 ) located inside of said vent ( 15 ), so that when an aluminium part ( 5 ) is removed from the cylindrical body said aluminum part carries a burr ( 17 ), leaving the grooves ( 16 ) of the vent ( 15 ) always clean and free; or a cylindrical body provided with a plurality of holes ( 21 ) having a taper with a larger section of the hole ( 22 ) located on an external surface of the vent ( 20 ) and a smaller section of the hole ( 23 ) is located inside of the vent ( 20 ).