The origin of Polymixte
In the area of screening surfaces, the fight against wear has always been a major concern. Several solutions to wear problems have emerged, including the move from steel to polyurethane which is probably the most significant event in recent years.
A screening surface, whether metal or plastic, is essentially defined by its mesh, a hole framed by the material with the primary purpose of ensuring the passage of a maximum amount of material of a desired particle size cut.
The choice of the material impacts the expected results depending on whether priority is given to wear or abrasion resistance, that is to say, the durability of the screen or, conversely, if permeability is preferred, the volume of production per tonne produced per hour.
If a highly rigid material such as high resistance steel is chosen, just add a little between each hole to ensure sufficient mechanical strength of the screen. If, instead, a more flexible material such as rubber or polyurethane is chosen, more material is needed to maintain the size of the mesh.
The coated steel wire of a wear-resistant synthetic material has been known for years as a potentially worthwhile solution. The GIRON company took an interest in it back in the early 80s. If the round section of composite wire has become the natural choice as the logical continuation of traditional steel wire, the identification of active parameters and their systematic and exclusive optimisation in terms of abrasion resistance, permeability and mechanical strength has enabled us to achieve a hybrid screening surface.
The principles of Polymixte were therefore established: :