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Influence of fabric structure on sodium hydroxide release from woven lyocell

机译:织物结构对梭织莱赛尔纤维释放氢氧化钠的影响

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The sodium hydroxide release (alkali wash-off) from lyocell fabrics with different weave constructions (plain, twill, sateen) was studied by conductivity measurements in the wash bath. An alkali transport coefficient (K) was established to quantify alkali release, which represents the liquid-side mass transfer of alkali release after a pad-batch process into the wash bath. nnThree regions of NaOH-release behaviour were observed and two competitive phenomena related to swelling, increase of the substrate surface, and the substrate compactness, have been recognized. Firstly (up to 2.25 mol dm-3), the influence of fabric-alkali interactions and non-uniform access of NaOH determines alkali release, and also the absolute K value is mainly determined by the bulk densities (plain 0.4998, twill 0.4622 and sateen 0.4096 g cm-3) and porosities (plain 0.671, twill 0.696 and sateen 0.731) and thus, it increases continuously. The maximum swelling of cellulose fibers occurs between 2.25-3.00 mol dm-3 NaOH; here, maximum K is observed as well as dependency on fabric construction is still determining factor. Above 3.75 mol dm-3 NaOH, the treated substrates are highly swollen sheets and the K does not show dependency on fabric constructions, thus, the fabric construction is not relevant at this range anymore for the alkali-diffusion. nnBecause materials consisting of the same type of fiber and with similar mass per area are currently considered to behave identically, the findings herein which contrast with the existing theory are of particular relevance in optimization of technical processing of regenerated cellulosic fabrics during alkalization.
机译:通过在洗涤浴中进行电导率测量研究了从具有不同编织结构(平纹,斜纹,缎纹)的莱赛尔织物中释放的氢氧化钠(碱洗掉)。建立碱传输系数(K)以定量碱释放,这表示在间歇式分批处理后进入洗涤浴后,碱释放的液体侧传质。 nn观察到了NaOH释放行为的三个区域,并且已经认识到与溶胀,基材表面增加和基材致密性相关的两个竞争现象。首先(高达2.25 mol dm-3),织物-碱相互作用和NaOH的不均匀接触的影响决定了碱的释放,绝对K值也主要由堆积密度决定(普通0.4998,斜纹0.4622和棉缎0.4096 g cm-3)和孔隙度(普通0.671,斜纹0.696和棉缎0.731),因此它连续增加。纤维素纤维的最大溶胀发生在2.25-3.00 mol dm-3 NaOH之间;在这里,观察到最大的K值,并且对织物结构的依赖性仍然是决定因素。高于3.75 mol dm-3 NaOH时,处理过的基材是高度溶胀的薄片,并且K不显示对织物结构的依赖性,因此,织物结构在此范围内不再与碱扩散相关。 nn由于目前认为由相同类型的纤维组成并且每面积质量相似的材料具有相同的性能,因此与现有理论相反的本文发现与碱化过程中再生纤维素织物的技术加工优化特别相关。

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