MOLDING ELEMENT FOR MANUFACTURING A NOISE REDUCING TREAD

The present invention provides a molding element (1) for a mold used for manufacturing a tread (101) of a tire having a plurality of contacting elements (104) delimited by a plurality of grooves (103), the molding element (1) having a molding surface (21) for forming a contact face (102) of the contacting elements (104) intended to come into contact with ground during rolling and a groove forming rib portion (3) for forming the groove (103) between adjacent contacting elements (104) comprising two opposed rib side faces (31, 32) for forming two opposed groove side faces (1031, 1032) and a rib top face (33) connecting two rib side faces (31, 32) for forming a groove bottom (1033), the groove forming rib portion (3) comprising at least one space (39) opening to at least one of the rib side faces (31, 32) and/or to the rib top face (33) and an insert (5) being received in the space (39) for forming a portion of the groove (103) and a closing device (105) in the groove (103), the insert being received in the space (39) together with at least one spacer (7), the spacer (7) having at least two contact faces (77, 78) intended to be in contact with the insert (5) and/or a face of the groove forming rib portion (3) defining to the space (39).