High-speed video graphic study of filament-core yarn spinning

Abstract

One of the challenges in spinning fine-count core yarns is to achieve a perfect coverage of the core, especially when the filament core comprises a large proportion of the yarn. Any uncovered parts of the core will appear on the yarn surface as periodical defects, known as the barber-pole effect. The main tool available for spinners to improve yarn coverage (i.e. reduction of barber-pole effect) is optimising the relative roving and filament feeding configuration at the entrance to the yarn-forming zone. Using high-speed video photography, we investigated the formation of the barber-pole effect for several feeding configurations and the use of a false-twisting device. Core-yarn coverage could be improved by applying false twist in the yarn-formation zone. The direction of the false twist relative to the final twist imparted by the ring spindle was found to be critical to the improvement of the resultant core-yarn coverage. The coverage of core yarns produced in the trials was evaluated using an objective method based on a fast Fourier transform (FFT) algorithm. The objective assessment method is also described.

Effect of Hybrid Yarn Structure Composed of PP/Tencel/Quick dry PET on the Physical Property of Fabric for High Emotional Garment

“…그리고 siro-core사와 siro-fil사의 구조와 직물 물성의 차이에 관한 연구 (Liu et al, 2007a;Liu et al, 2007b;Miao et al, 2010;Pourahmad & Johari, 2011a;Pourahmad & Johari, 2011b;Xia et al, 2012)도 최근까지 많이 발표되었다. 한편 구성섬유특성, pore size, 실과 직물의 구조 파라메타에 따른 직물의 열이동 관련 쾌적특성에 관한 연구 (McGregor & Naebe, 2013;Nyoni & Brook, 2006;Patil et al, 2009;Tashkandi et al, 2013;Varshney et al, 2010) (Adler & Walsh, 1984;Hiraku & Yoichiro, 1993;Hsieh, 1995;Lee, 2006;Lee & Kim, 2001;Pack, 1995) (Hiraku & Yoichiro, 1993;Hsieh, 1995;Pack, 1995 …”

The Effects of Production Parameters on the Core Visibility Ratio of Dual Core Yarns

“…Since the eccentric location of the core filament in the yarn axis or irregular covering of the sheath stables lead to bad appearance on the yarn surface, this type of core/sheath distribution is evaluated as yarn defect. Some studies have been performed regarding the effect of core-spun yarn structure and spinning parameters on core filament placement and the sheath staples strip-back from core filament phenomena [1][2][3][4][5][6][7][8][9]. These strip-back phenomena are called as barberpole by Sawhney [2] and it is concluded that strip-back occurs between core and sheath components because of two important reasons; nonconformity between core-spun yarn and core filament linear densities, insufficient twist level.…”

A method to produce ring single yarn with fancy and anti-frictional structure by feeding filaments in front of the front roller nip

“…Continuous filaments assist staple fibers during their conversion into high quality spun yarns, and is widely used in ring composite spinning methods such as sirofil, 1 corefil, [2][3][4] and embeddable and locatable spinning. 5 Sirofil spinning is achieved by changing one staple strand (S) as a filaments in a sirospun system, producing yarns with external filaments and an S helical appearance.…”

“…1 When the filaments overlap the S in the front roller nip, corefil spinning is performed to produce yarns with internal filaments buried by the staple sheath. [2][3] Therefore, corefil spun yarn retains a hairy staple yarn appearance, 4 which differs from the sirofil bicomponent surface. A common feature of both sirofil and corefil yarns is that they fail to clamp staple fibers using filaments, 6 thus they easily incur structural damage and slippage between filaments and Ss during tensile drawing and friction.…”