Thermal and sound insulation unit with a double bottom, especially a flooring or partitioning unit

摘要

In a unit with a double bottom, comprising a central material (1) covered on its upper and lower faces by a sheet (2, 3) of a fibre-reinforced thermoplastic substance, the upper sheet (3) is provided with a coating (4) bonded to the said sheet (3) without the involvement of any adhesive.
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