An Overview on the Spinning Triangle Based Modifications of Ring Frame to Reduce the Staple Yarn Hairiness <s> Aerodynamically Compacting System <s> This research is a comparative study of the physical properties of mechanical compact and conventional spun yarns and fabrics knitted from these yarns. To experiment the relational behavior, mechanical compact and conventional spun cotton yarns were produced in three different yarn linear densities having three twist levels. In order to examine the effect of spinning systems on fabric properties single jersey fabrics were knitted from these yarns. Results showed that, compact spun yarns have less hairiness, higher strength and higher elongation ratio than conventional spun yarns. Also, fabrics produced with compact yarns were found to have less pilling tendency. In the second part of the study, we compared the yarn properties produced with conventional ring, mechanical compact and pneumatic compact spinning systems. Analysis showed that, yarns produced with the pneumatic compact spinning system had the highest strength and the lowest hairiness. <s> BIB001 </s> An Overview on the Spinning Triangle Based Modifications of Ring Frame to Reduce the Staple Yarn Hairiness <s> Aerodynamically Compacting System <s> Compact spinning is one of the most important improvements of traditional ring spinning, which is implemented by adding a fiber condensing device to condense the fiber bundle and decrease the spinning triangle. Pneumatic compact spinning is the most widely used compact spinning method at present. Compact spinning with perforated drum and compact spinning with lattice apron are the two main kinds of pneumatic compact spinning. Therefore, in this paper, comparison analysis of yarn quality between compact spinning with perforated drum and compact spinning with lattice apron is presented. First, 9.7 tex cotton-combed yarn is spun in three different kinds of pneumatic compact spinning systems, including two kinds of compact spinning with perforated drum: Rieter’s COM4 and complete condensing spinning system (CCSS), and one lattice apron compact spinning system: Toyota’s four-line compact spinning. The test results of yarn qualities show that comparing with other two kinds of compact spinning systems, the yarn ... <s> BIB002 </s> An Overview on the Spinning Triangle Based Modifications of Ring Frame to Reduce the Staple Yarn Hairiness <s> Aerodynamically Compacting System <s> Purpose – Pneumatic compact spinning is the most widely used compact spinning method at present, in which the negative pressure airflow is used to condense the fiber bundle and decrease the spinning triangle. Compact spinning with perforated drum and lattice apron are mainly two kinds of pneumatic compact spinning now. The purpose of this paper is to study the comparative analysis on four kinds of pneumatic compact spinning systems, including two kinds of compact spinning with perforated drum: Rieter’s COM4 and complete condensing spinning (CCS), two kinds of compact spinning with lattice apron: Sussen’s three-line compact spinning (TLCS) and Toyota’s four-line compact spinning (FLCS). Design/methodology/approach – First, the basic properties of four systems were introduced and comparatively analyzed. Then, the 29.2 tex (20S), 14.6 tex (40S), 9.7 tex (60S) and 7.3 tex (80S) combed cotton yarns were spun in the four pneumatic compact spinning systems and ring spinning system, respectively. The evenness, br... <s> BIB003
Pneumatic compact spinning is the most widely used compact spinning method at present, in which the negative pressure airflow is used to condense the fiber bundle and decrease the spinning triangle BIB003 . Most of the pneumatic compacting systems are composed of perforated drums or lattice aprons over the openings of the suction slots. With the air flow, the fibers move sideways and they are consequently condensed. However the adaptation of this system to conventional ring spinning machine is very complex and expensive; also this method cause high additional energy consumption during spinning process BIB001 . 1) Rieter Compact-Spinning Machine K 48: The fiber condensing zone immediately follows a 3-roller drafting system with double aprons. The bottom delivery roller of the drafting system is replaced by a positively driven perforated drum (sieve drum) with strip groove structure on the surface for this purpose (shown in Figure 2 ). A fixed suction system that is connected to the machine's central extraction unit generating a vacuum is fitted inside this perforated drum. This results in a current of air flowing from the outside to the inside of the drum. The fibers supplied from the delivery nip line of the drafting system are thus held firmly on the surface of the perforated drum and move with the circumferential speed of the drum. A subsequent, second top roller also presses on the drum. The area between the front nip and output nip is the condensing zone. An additional nip roller prevents the twist from being propagated into the condensing zone. The air current created by the vacuum generated in the perforated drum condenses laterally the fibers by means of aerodynamic forces after the main draft. The fibers are fully controlled all the way from the nipping line after the drafting zone to the spinning triangle (shown in Figure 3 ). The spinning triangle becomes so small as virtually to disappear. In the process, all the fibers from the remaining spinning triangle are collected and fully integrated in the yarn  BIB002 . The new air guide element (shown in Figure 4 ) Detect monitors the air flow to the individual spinning positions. If the under pressure reaches a limit value, a red marking on the air guide element indicates that the compacting unit must be checked. This feature prevents noncompacted yarn being produced  . Journal of Textile Science and Technology 