| 摘要 |
795,457. Flaw detecting. SWITZER BROS., Inc. Dec. 9, 1955 [Sept. 21, 1955], No. 29421/57. Divided out of 795,451). Class 106 (2). [Also in Group XL (a)] A penetrant composition for locating flaws in test bodies comprises a flaw penetrating watermiscible liquid vehicle and a plurality of fluorescent dyes one of which has an emission peak in the visible light range and one or more of the other has an emission peak or peaks lying in the range of maximum absorption of light of the first dyes. The second dye or other dyes should be substantially non-absorptive and reflective in the emission ranges of the first dye or other dyes. This cascading relationship is obtained with such dyes as Rhodamines and Cumarins, specific examples being 4 N, butylamino 1, 8 naphthal N-butylimide; 4 methyl-7 diethyl amino-cumarin, Rhodamine base; 4 amino sulpho 1, 8 naphthal 4<SP>1</SP> methyl phenyl-imide; Uranine Yellow; Beta methyl umbelliferone; and Fluorescein in twin or triplet relationship. The preferred vehicle may use sulphonated castor oil, polyoxyethylene sorbitol monoleate in water, dodecyl benzine sodium, sulphonate in water with or without diethylene glycol, and the iso-octyl phenyl ether of polyethylene glycol. The fluorescent penetrants are applied to the test bodies by coating or immersion, the bodies being scrubbed or sprayed with water and the cracks developed with talc and viewed by light rich in ultra violet, but deficient in green and longer wavelengths. A filter may exclude light reflected by the test body. The methods are applicable to flaws in metal plastic, glass and porcelain.
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