Tread Band Having Curved Blocks with Sipes
The disclosure concerns a tread band for a tire, said tread band having two sides with a predetermined distance D between these two sides and a centre. Indeed the tread band has a plurality of blocks, each block extending continuously in a curved manner to one side of the tread band towards the centre of this tread band with no groove separating this block in different parts, the block following a certain curvature C. All or part of the blocks of the plurality of blocks include a main sipe extending in the block and following the same curvature C, this sipe separating the block in two half parts.
1 . A tread band for a tire, comprising:
two sides with a predetermined distance D between these two sides and a center,
a plurality of blocks, each of the plurality of block extending continuously in a curved manner to one side of the tread band towards the center, with no groove separating the block in different parts, the block following a certain curvature C,
wherein all or part of the blocks of the plurality of blocks include a main sipe extending in the block and following the same curvature C, the sipe separating the block in two half parts.
2 . The tread band according to claim 1 , wherein the block comprises a plurality of secondary sipes, each of the plurality secondary sipes extending perpendicularly to the main sipe.
3 . The tread band according to claim 2 , the pitch between the plurality of secondary sipes is globally equal along the main sipe.
4 . The tread band according to claim 1 , wherein each of the plurality of blocks has lateral walls, and the secondary sipes do not extend until one of the lateral walls of the block.
5 . The tread band according to claim 1 , wherein the main sipe has a depth of main sipe and the secondary sipes have the depth of secondary sipes, and the depth of the secondary sipes is different than the depth of the main sipe.