Composite material for fabrication of sails and other articles

Details Composite material for fabrication of sails and other articles Composite material for fabrication of sails and other articles

1994-07-18

1995-11-28

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including grain, strips, or filamentary elements in...

156167, 156179, 1562755, 428105, 428292, 428294, 428296, 428297, 428298, 428448, 428902, B32B 512

Patent

active

054706327

ABSTRACT:
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 form one or more uni-tapes laminated to a polymer film such as Mylar, or other extended sheet of material. The monofilaments are uniformly embedded in the uni-tape via an elastomeric polymer matrix, with the reinforcing sheet, when incorporated 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-monofilament crossover density, resulting in a dramatic increase in shear strength, and Youngs' 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.

REFERENCES:
patent: 4916000 (1990-04-01), Li et al.
patent: 5112667 (1992-05-01), Li et al.
patent: 5354605 (1994-10-01), Lin et al.

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