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Substrate based on a nonwoven sheet made of chemical textile

  • US 5,118,550 A
  • Filed: 12/11/1989
  • Issued: 06/02/1992
  • Est. Priority Date: 12/13/1988
  • Status: Expired due to Term
First Claim
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1. A substrate based on a nonwoven sheet for a flat article, with good dimensional stability in all the conditions of production, subsequent treatments and use, comprising a nonwoven sheet of synthetic textile material in the form of fibres or of continuous filaments, said sheet having a weight of between 20 and 500 g/m2 and, bonded thereto, high modulus reinforcing threads exhibiting a Young'"'"'s modulus of more than 20 GPa arranged parallel to each other in the lengthwise direction of the nonwoven sheet, the quantity of reinforcing threads being such that, when the substrate is subjected to tensile forces in the lengthwise direction at 180°

  • C., the breaking stress of the reinforcing threads is at least 80 daN per meter of width, and the Young'"'"'s Modulus of the substrate at ambient temperature is not appreciably modified relative to the same modulus, measured in the same conditions, of the nonwoven base sheet without reinforcing threads.

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