B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 5/12 (2006.01) B29C 70/44 (2006.01) B32B 27/12 (2006.01) B63H 9/06 (2006.01)
Patent
CA 2149539
An improved reinforced laminate for use in sails or other flexible sheet or membrane applications utilizes a pull-truded thin lightweight reinforcing sheet of unidirectional extruded monofilaments in which the reinforcing sheet or sheets (32, 34, 36) form one or more uni-tapes laminated to a polymer film (40) such as Mylar®, or other extended sheet of material. The monofil- aments (38) are uniformly embedded in the uni-tape via an elastomeric polymer matrix, with the reinforcing sheet, when in- corporated into sails via lamination resulting in sails with reinforcing monofilaments having diameters 5 times less than conventional strands or threads. The use of small diameter monofilaments greatly increases the monofilament-over-mono- filament crossover density, resulting in a dramatic increase in shear strength, and Young's Modulus, with an accompanying dramatic decrease in weight. In one embodiment the improvement in specific modulus over conventional sail laminates is about six-fold. For example, at only one-third the weight, stretch resistance is two times better. In a preferred embodiment, autoclaving is used in the lamination process to rid the laminate of voids which dramatically reduce shear strength by as much as 30 percent. Alternative void-free laminating processes include a silicone interliner/heated platen technique.
Downs Roland J.
Meldner Heiner
Cubic Tech Corporation
Macrae & Co.
The America3 Foundation
LandOfFree
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