Abstract:
The invention relates to a fabric for lightweight nautical sails, such as spinnakers, asymmetric spinnakers, and gennakers, for sailboats and other surface vessels, the fabric being formed of continuous polyester warp and weft yarns and being coated on one or both of its two surfaces with a crosslinked polymer, characterised in that the polyester is poly(ethylene terephthalate) (PET) having a tenacity greater than or equal to 6 cN/dtex; in that the fabric has a density of between 20 and 50 threads/cm, in terms of warp and weft density; in that the polymer is a crosslinked polyurethane (PU) that is polyether-, polyester-, or polycarbonate based; and in that this PU is derived from the crosslinking (1) of a single-component polyurethane elastomer having a modulus at 100% elongation comprised between 1 and 15 MPa, better still between 2 and 15 MPa, in particular between 6 and 15 MPa, according to the standard DIN 53504, used in implementation in solvent phase; and (2) by a crosslinking agent, based on a proportion of dry crosslinking agent relative to the dry elastomer of between 20% and 75% by weight, in particular between approximately 30% and approximately 75% by weight. The coated fabric has an elongation in the bias direction under 20 Lbs, comprised between 10 and 30 hundredths of an inch.
Abstract:
A fabric for a ship traction structure, formed from multifilament continuous warp yarns and weft yarns and coated on one or both of its two surfaces with a polyurethane (PU), the bare fabric having a coverage rate TC of between 1.8 and 4, the yarns being made of poly(ethylene terephthalate) (PET), the fabric having a density of between 20 and 50 yarns/cm, in terms of warp and weft density, the polyurethane being a crosslinked PU that is polyether-, polyester-, or polycarbonate-based, and this PU being derived from the crosslinking (1) of a single-component polyurethane having a modulus at 100% elongation less than or equal to 5 MPa, in particular between 1 and 4 MPa, in particular between 1 and 3 MPa, according to the standard DIN 53504, implemented in organic solvent phase; (2) by a crosslinking agent, based on a proportion of dry crosslinking agent relative to the dry elastomer of between approximately 5% and approximately 30% by weight, the fabric having a weight, coating included, ranging from 43 or 44 to 250 g/m2. A ship traction structure, in particular of the paraglider sail type, made with such a fabric.
Abstract:
This invention relates to a composite comprising two polyurethane films, identical or different, that are connected to one another and between which a reinforcement mesh and at least one textile reinforcement thread oriented according to at least one predetermined stress line is inserted. The invention also relates to sails including such a composite.