Seed press wheel for sowing units for precision seeders. The seed press wheel includes a solid tire in the shape of a disc that has a hole or central axis for mounting the tire on a hub. The solid tire has a first portion extending radially from the central axis, and a second portion extending radially from the first portion, the first portion being made of a first material having a first modulus of elasticity value, and the second portion being made of a second material having a second modulus of elasticity value, the first modulus of elasticity value being different from the second modulus of elasticity value.

A curing mold (10) for a tire comprises: a plurality of circumferentially distributed sectors (18) that are intended to mold the tread of the tire, at least one sipe blade (40) intended to mold a void in the tread, the sipe blade extending over two adjacent sectors (18) such that the sipe blade comprises a part (40a, 40b) in each of the two sectors, the two parts of the sipe blade being separated, in the closed position of the mold, by a space (26) that creates flash during the curing of a tire, the parts of the sipe blade comprising cutting means (38) that are able to cut off the flash during the opening of the mold.

An anti-slip rod-shaped rare-earth-modified polyurethane material, the anti-slip rod shaped rare-earth-modified polyurethane material is formed by mixing and curing a premixed material and isocyanate, the premixed material is prepared by mixing a rod-shaped rare-earth oxide pre-dispersion solution, polyethylene glycol (PEG) 600, glycerol, a catalyst, water, and color paste, and the rod-shaped rare-earth oxide pre-dispersion solution is prepared by mixing PEG400, a dispersant, a defoamer, and rod-shaped rare-earth oxides.