Composite products, methods and apparatus

B - Operations – Transporting – 29 – C

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B29C 70/06 (2006.01) B29B 15/10 (2006.01) B29C 35/02 (2006.01) B32B 3/14 (2006.01) B32B 5/02 (2006.01) B32B 5/12 (2006.01) B32B 7/02 (2006.01) B32B 27/12 (2006.01) B63H 9/06 (2006.01)

Patent

CA 2346826

A low-stretch, flexible composite, made of one or several sections, particularly useful for making a sail (2), includes first and second polymer films (52, 62) with discontinuous, stretch-resistant segments (16) therebetween. The segments extend generally along the load lines (17) for the sail. The segments have lengths which are substantially shorter than corresponding lengths of the load lines within each section. The ends of the segments are laterally staggered relative to one another. Mats (20) of generally parallel mat elements can be used as the segments. The mat elements typically include discrete multifiber yarns (24, 26) and/or a fiber array (22), typically created by pneumatically laterally spreading apart the fibers of an untwisted multifiber yarn (32). A laminating assembly includes first and second flexible pressure sheets (66, 68), defining a sealable lamination interior (82) containing the material stack (64) to be laminated, housed within an enclosure (90). A partial vacuum is created within the lamination interior and heated fluid is circulated in contact with the pressure sheets to quickly and uniformly heat the pressure sheets and the material stack being laminated.

L'invention concerne un composite à faible coefficient d'étirement, flexible, fait d'une ou de plusieurs sections, convenant particulièrement pour la fabrication d'une voile (2). Ce composite comprend un premier et un second films polymères (52, 62) ainsi que des segments discontinus résistant à l'étirement (16) placés entre ces derniers. Ces segments s'étendent généralement le long de lignes de charge (17) destinées à la voile. La longueur de ces lignes est nettement plus courte que celle des lignes de charge correspondantes à l'intérieur de chaque section. Les extrémités des segments sont décalés latéralement les uns des autres. Des mats (20) constitués généralement d'éléments parallèles peuvent être utilisés comme les segments. Ces éléments comprennent le plus souvent des fils multifibres distincts (24, 26) et/ou un réseau de fibres (22), créé en règle générale par répartition latérale pneumatique des fibres d'un fil multifibres (32) sans torsion. Un système de stratification comprend une première et une seconde feuilles de presse flexibles (66, 68), définissant un espace interne de stratification (82) par compression, qui contient la pile de matériaux (64) à stratifier, à l'intérieur d'une enceinte (90). On crée un vide partiel dans l'espace interne de stratification et on fait circuler un liquide chauffé le long des feuilles de presse afin de chauffer rapidement et uniformément lesdites feuilles, ainsi que la pile de matériaux à laminer.

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