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  • Pozycja
    Comparison of the fineness and mechanical properties of hemp fiber conditionned in two different relative humidity environments
    (Wydawnictwo Politechniki Łódzkiej, 2022) Decker, Aurélie; Tritter, Adrien; Sarazin, Vivien; Harzallah, Omar; Drean, Jean-Yves
    Bast fiber, like hemp, has an affinity for water [1,2]. The moisture content of hemp fiber increased with the increasing of relative humidity [1]. The relative humidity changes the fiber properties [2,3] studied by LPMT (Laboratoire de Physique et de Mécanique Textile) in Mulhouse, France. A comparison of the fiber properties measured in two different relative humidity environments (30% and 60%) was studied. The fiber was placed between two specific cardstock frameworks with glue. The fineness was determined from the diameter measured with a projection microscope. Then, the tensile test was realised with MTS® , tensile testing instrument, to determine the breaking force, strain and stress and the Young’s modulus. The hemp fiber was manually extracted from unretted stem. The cultivar used was Santhica 27 cultivated in the East of France [4] by SADEF, a plant nutrition expert. The impact of the relative humidity environment on the fiber properties was not constant. The tensile tests realised in this study were not homogeneous. Dispersion of the results could be caused by bast fiber multi-scale. The selection caused more variability of fiber properties than the relative humidity for hemp fiber.
  • Pozycja
    Evolution of the mechanical and morphological properties of two hemp cultivars (santhica 27 and félina 34) during the dew-retted
    (Wydawnictwo Politechniki Łódzkiej, 2022) Decker, Aurélie; Tritter, Adrien; Sarazin, Vivien; Harzallah, Omar; Drean, Jean-Yves
    The hemp is easy to cultivate in the East of France. SADEF, specialist in plant nutrition, studied this culture since 2013. But to extract the fiber, the stem must be retting. Actually, the dew retted is the most used in France. The retted is a very hazardous stage: if the stem is under-retted, the fiber extraction will be difficult; or if the stem is over-retted; the fiber properties will be degraded. Many factors (the cultivar, the weather, the duration...) [1–4] impact the fiber quality. This study observes the evolution of the mechanical and morphological properties of two hemp cultivars during the dew-retted. Two cultivars, Santhica 27 and Felina 34 were cultivated in 2020 in the East of France by SADEF. Every week, dew-retted stems were selected during eight weeks. The evaluation of the fiber quality was performed at the LPMT (Laboratoire de Physique et de Mécanique Textile) in Mulhouse, France. The color was measured by the DataColor. The fiber linear density was measured by the VIBROMAT Me followed by its tensile test performed by FAVIMAT [5]. All data were analyzed by ANOVA method. The fine fiber proportion increased during the retted. However, the tenacity decreased. At the retted end, there was no significant difference between the two cultivars mechanical properties.