Mould segments with indexing means and method of aligning mould segments

A mould segment (1) of a mould matrix used in the production of premoulded and precured tyre thread, the mould segment (1) comprising:

• a base (8) with a base back (19), a base front (17) and transverse edges forming part of the first and second opposing transverse edges (14 and 15) of the mould segment (1);
• a first and a second opposing mould walls (12, 13) at each end of the base (8) and rising from the base front (17), each opposing mould walls (12, 13) having an inner surface (21), an outer surface (22), a contact surface (23), a shoulder (24) and transverse edges forming part of the first and second transverse edges (14 and 15) of the mould segment (1);
• a mould cavity (11) on the base front (17) and between the opposing mould walls (12, 13) with the mould cavity (11), the opposing mould walls (12, 13) and the base (8) forming an integral unit;
• wherein the mould segment (1) is provided with an indexing means for the first and second opposing transverse edges (14 and 15) for alignment of the mould segment (1) to the adjacent mount segments (2 and 3) of the mould matrix.