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The H2SD: Inter-laboratory test results

Gozé E., Frydrych R., Gourlot J.P., Lassus S., Bachelier B.. 2005. In : Proceedings of the Beltwide Cotton Conference 2005, New Orleans, USA, 4-7/01/05. Memphis : NCCA, p. 2342-2346. Beltwide Cotton Conferences, 2005-01-04/2005-01-07, New Orleans (Etats-Unis).

This study involves three High Speed Stickiness Detectors (H2SD) located in three different laboratories. The goal is first, to determine between-measurement variability for each of these devices and second to compare the mean count in each device with the others. Fifteen cottons covering a wide range of 1 to 60 sticky spots were mixed twice using a laboratory opener, and were then dispatched to the laboratories. Each laboratory made 10 measurements with its H2SD on the 15 cottons following a randomized block design. The entire measurement procedure was replicated twice. The square of the number of sticky spots was analyzed using a mixed linear model, with fixed laboratory and long-term time effects, and random short-term time effects. The residual variability within the laboratories was approximately the same for all three. Some short term or longer-term drift was observed, depending on the laboratory. Significant differences were observed between the laboratories, though the correlation between the results was very high (R2=0.96, 0.97 or 0.99). The usefulness of a calibration is discussed.

Mots-clés : coton; fibre végétale; fibre textile; propriété physicochimique; mesure; instrument de mesure

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