Wash–dry cycle induced changes in low‐ordered parts of regenerated cellulosic fibers

Abstract

Three regenerated cellulosic fiber types: lyocell, viscose, and modal were subjected to repetitive wetdry treatments. Simulated treatments showed reorganization of the internal fiber structure which could be determined by accessibility studies. The reduction in liquid water retention capacity was found to be greater for lyocell than that for modal and viscose, sorption of iodine, and water vapor reduced for all studied fibers. The wet-dry treatment did not have influence on chemical reactivity of cellulosic fibers characterized by complexation of iron under highly alkaline conditions. The effect of wet-dry treatment on the tenacity, elongation at break, abrasion resistance, and molecular weight distribution of fibers was also explored in this study. The reduced strength in treated specimens was not accompanied by changes in molecular weight distributions. Based on these results, the changes observed in wet-drytreated specimens were observed mainly owing to polymer reorganization in amorphous parts of the fibers. V C 2012Wiley Periodicals, Inc. J Appl Polym Sci 126: E396-E407, 2012

Enhancing the Energy Efficiency of Domestic Dryer by Drying Process Optimization

“…This is because free moisture (retained on fabric surface and pores between yarns and pores between fibers) is mechanically connected to the fabric. [31] , [32] A higher heater power (4000W ) and a higher air flow rate (8.5m /s) help the evaporation and removal of moisture from the fabric (see Table 4). The drying fabric is easier to spread than the wet fabric, so a slower rotating speed of drying drum (45-50rpm ) is needed and this saves energy (Table 4).…”

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Quality of sponge cloths evaluated on the basis of their strength properties

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“…17,18 Hydrophilic fibers, such as cellulose fibers, swell when they absorb water molecules. The arrangement of molecular chains can be changed 17,19 and the rotation along the fiber axis also increases due to absorption and desorption moisture, 20 such that the chains can achieve higher mobility, especially in amorphous region. 19 In contrast, hydrophobic fibers, such as nylon or polyester, with very low or no water absorbency will show little such effect.…”