Method of splicing reinforcement fiber

Details Method of splicing reinforcement fiber Method of splicing reinforcement fiber

1981-11-21

1984-01-31

Cannon, James C.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

57 22, 156158, 242 581, 428294, 4284735, B65H 1918, B65H 6902, B65H 6906

Patent

active

044289928

ABSTRACT:
Reinforcement fiber for fiber-reinforced resin composites such as graphite tows are spliced by applying a solution of a linear, soluble, high glass transition temperature polyimide having good thermal-oxidative stability to the broken ends of a fiber, placing the ends in contact and removing solvent. The preferred polyimide is an aromatic-cycloaliphatic diamine such as 5,(6)-amino-1-(4' amino phenyl)-1,3-trimethylindane (DAPI) imidized with a dianhydride such as PMDA or BTDA. The soluble polyimide can be preapplied to the fiber as a sizing. The splices are not apparent by visual inspection nor by instrumental scanning of cured composites indicating there is no blistering nor loss of strength.

REFERENCES:
patent: 469015 (1892-02-01), Hemenway
patent: 3070947 (1963-01-01), Toledo et al.
patent: 3386871 (1968-06-01), Dulin et al.
patent: 3607507 (1971-09-01), Enos
patent: 3665586 (1972-05-01), Lacey
patent: 3904458 (1975-09-01), Wray
patent: 4028162 (1977-06-01), Cherin et al.
patent: 4077822 (1978-03-01), Logwin

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