METHOD EVALUATING RESISTANCE OF TEXTILE MATERIAL TO LIGHT AND WEATHER FACTORS Russian patent published in 2013 - IPC G01N17/00 

FIELD: physics.

SUBSTANCE: method of evaluating resistance of textile material to light and weather factors involves preparation of the required amount of samples of the material, testing their initial breaking load, fixing them on a stand with an exposing surface which is tilted at an angle of 45° to the horizontal and is directed to the south, exposing the test material to natural light and weather factors on open air for not less than one year and periodically, every one to two months, testing the breaking load of the part of the exposed samples of the material. Relative loss of the breaking load is determined by comparing properties of the exposed samples with non-exposed samples and the kinetic curve of loss of strength over exposure time is plotted. While exposing the samples, the total, direct and scattered energy of solar radiation in MJ/m entering the zone of the samples is measured, recorded and integrated, after which the kinetic curve of accumulation of radiation energy over exposure time is plotted. Using graphic construction, said curve is superimposed with the kinetic curve of loss of breaking load such that the origin and exposure time values coincide and reflect the link between the curve of loss of strength and the amount of accumulated solar radiation energy which is used as the quantitative characteristic of resistance of the textile material to light and weather factors in form of units of the insolation index. To this end, duration of exposure which leads to 35% loss of breaking load of the material is determined and the amount of energy effect of the total solar radiation in MJ/m² which causes 35% loss of breaking load is determined and resistance of the textile material is calculated in form of units of the insolation index (1 unit=100 MJ/m²).

EFFECT: high reliability and objectivity of evaluation owing to a universal quantitative characteristic of resistance of textile material in form of units of the insolation index.

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