Plastic flat hollow piece for forming e.g. backrest body of automobile seat, has bridge separating and maintaining covering elements to provide section, mechanically equivalent to I-shaped structure, to piece for increasing rigidity

摘要

The piece (1) has a front wall (2) and a rear wall joined by upper, lower and lateral edges (4, 5, 6). An external armature (17) has two covering elements (18) containing reinforcement filaments or threads drowned in a thermoplastic resin layer. A plastic bridge separates and maintains the elements to provide a section, mechanically equivalent to an I-shaped structure, to the piece at the level of the covering elements for increasing rigidity of the piece. The filaments or threads are made of glass, carbon or Kevlar(RTM: light, strong para-aramid synthetic fiber).