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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
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
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).
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