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18. A curvilinear conveyor chain suitable for sliding along a guide comprising at least one curved section, wherein said conveyor chain comprises a plurality of links articulated to each other by respective articulation pins and wherein each of said links comprises a plate body having a first surface defining a support surface adapted to support products to be conveyed and an articulation portion extending below said first surface of said plate body and substantially in the middle thereof and comprising at least a pair of housings transverse to the travel direction (DS) of said conveyor chain along said guide and suitable for accommodating each a respective articulation pin of said link with similar antecedent and subsequent links, respectively, wherein said plate body and said articulation portion are made of a first thermoplastic material and by the fact that said articulation pins are made of a second thermoplastic material, wherein said first thermoplastic material and said second thermoplastic material belong to the same polymeric family, and wherein said plate body has, externally to said articulation portion, a maximum thickness (S2) greater than 5 mm and said articulation pins have a diameter greater than 5 mm.
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