Page 1 of UV Preparations by Flockenhaus

flockenhaus gmbh co kg an der waides 2 36037 fulda germany tel +49-661-72881 fax +49-661-74933 e-mail office@flockenhaus.de web www.flockenhaus.de uv-preparations and their application in the textile industry let us first consider some fundamental principles of light in order to generate light it is necessary to excite a luminescent body through application of energy for example when switching on a light switch current is allowed to flow through the filament of the electric bulb and the latter begins to illuminate to produce a yellow light some grains of common salt are thrown into the flame of a burner and the bluish-red flame immediately turns yellow the wavelength of light is measured in nanometres abbreviated to nm or in Ångstrom abbreviation Å 1 nm 10-4 cm 1 Å 10-8 cm the human eye perceives light in the range of 380 to 780 nm below 380 nm and above 780 nm light is invisible to the human eye and one differentiates accordingly above 780 nm infra red light and below 380 nm ultra violet light the latter is far more rich in energy than infra red light in the case of ultra violet light the subject of the present paper we have a a short wave radiation of about 254 nm and b a long wave radiation of about 366 nm re a the short wave radiation is furthest removed from visible light it is used amongst other things for chemical analysis purposes short wave rays very rapidly give rise to unexpected shin burns and also damage the eyes for this last mentioned reason it is essential to wear protective goggles whenever working with short wave light re b long wave light of about 366nm lies closest to visible light it energises the fluorescence of many natural and artificially produced materials moreover the long wave rays are not harmful to the skin or eyes even with prolonged exposure for example if a uv-dyestuff is applied to a piece of fabric the dyestuff is invisible to the human eye however when switching of a uv-lamp with long wave radiation the particles of the uv-dye begin to radiate due to excitation through the uv light i.e the marked position illuminates and can be seen by the human eye wherever there is a need in the textile industry to invisibly mark faults uv-luminescent dyes have proved highly successful for many years various uv-preparations are being offered for the above purpose by one of the companies eminent in this specialist field in this regard the author offers some advice in the following chapters uv-inks ­ in the case of uv-inks and the necessary accessories it is the our opinion that this is the best cheapest and simplest method of uv marking.

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