BALLISTIC RESISTANCE OF NEEDLE-PUNCHED NYLON FELTS
Final rept., Oct 1963-Feb 1965
FELTERS CO BOSTON MA
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Felts made from high tenacity nylon 6,6 industrial quality, bright, 6-denier filament, three-inch staple, crimpset fiber were found to be the most satisfactory in ballistic resistance, uniformity, and ease of processing among the group studied. Batts that were cross-laid proved to be superior to the parallel-laid batts and equal to a combination of straight- and cross-laid batts. The best felt, from the standpoint of both ballistic resistance and dimensional stability, was produced by needling 4-ounce batts alternately on each side, with 277 penetrations per square inch and a half-inch needle penetration, followed by flat-bed pressing using 0.29-in spacer bars at 310F for 2-12 min to attain the desired thickness. Producers virgin waste of the same high tenacity nylon 6,6 appeared to be promising although the test results were inconclusive.