Copyright © Md. Redwanul Islam et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. International Journal of Engineering & Technology, 10 (2) (2021) 85-88 International Journal of Engineering & Technology Website: www.sciencepubco.com/index.php/IJET Research paper Importance of spindle speed in ring frame Md. Redwanul Islam 1 *, Amit Chakrabortty 1 , Joyjit Ghosh 1 , Tareq Iqbal 2 , Md. Tanvir Hossen 3 1 Lecturer, Department of Textile Engineering, Ahsanullah University of Science and Technology (AUST), Bangladesh 2 Lecturer, Department of Textile Engineering and Management, BGMEA University of Fashion and Technology, Bangladesh 3 Lecturer, Department of Textile Engineering, Jashore University of Science and Technology (JUST), Bangladesh *Corresponding author E-mail: redwan.tex@aust.edu Abstract In textile industries, spinning sector plays a vital role because this sector produces the main raw material for the textile industries which is known as yarn. So for getting good qualities garments, it is needed to ensure the good qualities yarn. There are many things which are re- sponsible for producing good qualities yarn. Among these spindle speed is an important thing. One must have to change the spindle speed, when he changes the count. As every count has a particular spindle speed in which the production shows maximum production efficiency. Here we used five most commonly used yarn counts in the maximum factories. The counts are 15 Ne, 20 Ne, 25 Ne, 30 Ne and 40 Ne. We analyzed these counts with different speed and found that every count showed maximum efficiency at a particular spindle speed. The out- come of this paper is applicable in all types of ring frame machine , especially for producing single carded and combed yarn. Keywords: Ring frame; RPM of Spindle; Spinning factory; Spindle; Yarn count. 1. Introduction The productivity and efficiency of ring frame mostly depends on many factors like traveller, ring diameter, spindle speed etc [1-4]. When high speed spindle is used, it generates fly dust and causes fiber breakage. Hence there is a need fo selecting optimum speed of spindle, where one can get accurate production process as well as product quality [5-8]. On can get good qualities and breakage free production by selecting proper spindle speed [9].The identification of natural frequencies of the spindle because it’s very difficult to me asure the spindle speed when the spindle is moving at a high speed because there are a few sensors. For solving these problems some methods are used the modes are determined through a 3-step procedure. First, spindle modes are highlighted using the Frequency Domain Decomposition (FDD) technique, with a new formulation at the considered rotating speed. There are many counts variation in ring spinning system. Here I would like to introduce you about most commonly used yarn count like 15 Ne, 20 Ne, 25 Ne, 30 Ne and 40 Ne [10]. Results show a good correlation between numerical and experiment-based identified frequencies. The identified spindle-tool modal properties during machining allow the numerical model to be considered as representative of the real dynamic properties of the system [11]. Ring spinning which uses the Ring frame is the main spinning system is used by 7 in every 8 mills to produce cotton yarns for fabric production by knitting and weaving factories 3. The process of fibre to yarn conversion at the ring frame involves drafting, twisting roving of fibres and winding the spun yarn on the bobbin and is the costliest stage in the spinning process flow contributing 60% of the total cost of yarn production. Every factory wants to reduce the cost of their production for their profit as well as proper utilization of their natural sources [12]. 2. Materials and methods 2.1. Materials For this we use calculator, electric balance, and tachometer. Through the tachometer we measure the individual spindle speed and calculate them for comparing the reading value and electronic monitor value [13-15]. 2.2. Methods For this study we consider 1200 spindles and operate these and carefully monitor these for 7 days. We always try to maintain the all the spinning parameters properly and change only the spindle speed. The results of the work are discussed here with the practical data. i) Efficiency of ring frame machine at 12000 RPM spindle Speed: