Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Noninterengaged fiber-containing paper-free web or sheet...
Patent
1982-03-19
1983-09-06
Bell, James J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Noninterengaged fiber-containing paper-free web or sheet...
428286, 428246, 428297, 428298, 428911, B32B 2700
Patent
active
044030126
ABSTRACT:
Articles such as vests, helmets and structural elements containing a network of ultrahigh molecular weight, high strength, high modulus polyethylene or polypropylene fibers. The fibers, and especially polyethylene fibers of 15, 20, 25, 30 or more g/denier tenacity, and 300, 500, 1000, 1500 or more g/denier tensile modulus impart exceptional ballistic resistance to the articles in spite of the melting points, e.g. 145.degree.-151.degree. C. for the polyethylene fibers and 168.degree.-171.degree. C. for the polypropylene fibers, which are high for these polymers, but substantially lower than the 200.degree. C. or more melting point previously thought necessary for good ballistic resistance.
REFERENCES:
A. L. Alesi et al., "New Materials and Construction for Improved Helmets," Nov. 1975, pp. 1-11.
R. C. Liable et al., "The Application of High-Modulus Fibers to Ballistic Protection," J. Macromol. Sci.-Chem., A7(1), pp. 295-298, 312-314, 320-322 ('73).
R. C. Liable, "Ballistic Materials and Penetration Mechanics," Methods and Phenomena: Their Applications in Sci. and Tech., 1980, vol. 5, pp. 72-115.
J. V. Hansen et al., "Flexible Body Armor Materials," 10th National State of the Art Symposium, Washington, D.C., Jun. 1974.
Harpell Gary A.
Kavesh Sheldon
Palley Igor
Prevorsek Dusan C.
Allied Corporation
Bell James J.
Doernberg Alan M.
Fuchs Gerhard H,.
Massengill Roy H.
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