Method of producing string of polyamide and stringed rackets wit

Details Method of producing string of polyamide and stringed rackets wit Method of producing string of polyamide and stringed rackets wit

1979-11-08

1981-03-24

Nelms, David C.

Radiant energy

Irradiation of objects or material

Irradiation of semiconductor devices

20415919, A61K 2702

Patent

active

RE0305553

ABSTRACT:
String of polyamide is irradiated with dosages of 10.sup.4 to 10.sup.10 rads. It has been discovered by actual experience that in string which is treated in this way the cross linkage of the molecules is enhanced. Such string has higher elasticity and substantially lower damping when set into oscillation than untreated string and that a tennis racket produced with such string is superior to a racket with untreated polyamide string. The dosage is not so high as to cause the string to become brittle.

REFERENCES:
patent: 2257177 (1941-09-01), Luster
patent: 2878174 (1959-03-01), Rainer et al.
patent: 3069283 (1962-12-01), Coleman
patent: 3842705 (1974-10-01), Woodard et al.
patent: 4043555 (1977-08-01), Conn

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