Pneumatic tire tread with sipes and mold blade

A tire tread having at least one tread element (10) having a sipe (14) therein disclosed. The sipe (14) has a first portion (16) having a first and second opposed side (25, 27), and a third side (23) joining said first and second side (25, 27). The sipe further includes a continuous tubular pathway (30) (i) bordering said first, second and third side (23, 25, 27) or (ii) extending along the third side (23) and at least partially extending along at least one of the first and second side (25, 27). Also, a blade (10) for molding such a tread element (10) and a mold comprising such a blade (10) is disclosed.