String for a musical instrument
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United States of America Patent
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-
May 23, 1989
Grant Date -
N/A
app pub date -
Mar 19, 1987
filing date -
Mar 24, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A string for a musical instrument consisting of a monofilament made of a resin of vinylidene fluoride and having the following characteristics which give good clearness of sound, good sharpness of sound and good spread of sound: (1) the diameter of the monolfilament is in the range of 0.4 to 1.5 mm .phi.; (2) the unevenness of the diameter of the monofilament is less than 5% per meter of the monofilament length; (3) the circularity of the section of the monofilament is more than 95%; (4) the specific gravity is more than 1.6; (5) the inherent viscosity is in the range of 1.1 to 1.6 dl/g; (6) the apparent viscosity with the shear rate of 1/100 at 260.degree. C. is in the range of 8000 to 20000 poises; (7) the index of double refraction is in the range of 30.times.10.sup.-3 to 40.times.10.sup.-3 ; (8) the tensile strength is more than 50 kg/mm.sup.2 ; (9) the ductility is in the range of 10 to 40%; (10) the creep elongation limit with 20% load of the tensile strength is less than 10%; and (11) the Young's modulus is more than 200 kg/mm.sup.2.
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