Abstract
Some important identification and conformity parameters of technical textiles used in agricultural applications (agrotextiles) such as open area, porosity and opening size are investigated. Open area and porosity of two-dimensional agrotextiles are compared, as well as opening sizes, opening size distribution and characteristic opening size. These are obtained by scanning (based on the number of openings), and by dry sieving of sand fractions (based on the weight of the fractions that are retained). Good agreement is found between measured and calculated porosity. Open area and porosity, however, are totally different, even for two-dimensional agrotextiles. Yet, a linear relationship between open area and porosity is obtained. Comparison of the characteristic opening size obtained with scanning and dry sieving show better agreement for materials with smaller openings than for materials with larger openings. This is perhaps due to the fact that more openings were scanned for the former than for the latter. A difference of less than 10% between the characteristic opening sizes obtained with both methods seems achievable. The greater deviation for larger openings and for the stretchable, knit material with irregular openings, however, calls for further research.
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