An Investigation of Assembly Size of Material Fed and Its Influence on Quality of Drawframe Sliver

Investigation was carried out in respect to assembly size of material fed and its influence on quality of drawframe sliver. The assembly size of material was changed by changing width of the assembly clamp. This newly designed clamp was located just prior to back-bottom drafting roller in the drawframe. The significant difference in U% and degree of fiber orientation was noticed in the drawframe sliver with respect to difference in assembly size. The change in assembly size leads to change in density of a material fed. Hence the drafting force required to achieve the expected drawing operations were changes. Therefore apart from the unevenness of the sliver, the cohesive force, fiber orientation index and packing density of sliver is also considered as most important qualities which depend on assembly size of material fed. Therefore, the measurement of cohesive force, degree of fiber orientation and packing density is also carried out. With regard to determination of packing density of sliver, developed practical method may helps to understanding the fiber distribution and presence of air gaps in the sliver. Based on the sliver breakage study in the drawframe, concluded that the fiber orientation in the drawframe sliver doesnt influence the performance of drawframe process. The measurement of sliver cohesive force gives insight to select the appropriate draft distribution in the drawframe drafting system.

Key words: Lindsley Technique, Sliver cohesion, Packing fraction, Density of material fed

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Authors are associated with Department of Textile Technology, Anna University, Chennai.