the frame of the automobile vehicle seat back comprises a body extending over a general plane and functional components joined to the body , serving notably to attach or reinforce it . it is made in one piece from an overmoulded plastic material that forms the body , reinforced by a reinforcing strip comprising a woven band of mineral and plastic material fibres , the reinforcing strip extending in the general plane of the frame and interconnecting at least two of the functional components comprising inserts at least partially embedded in the body .