1. Parameter of different parts of ring frame machine

2. Name ID Rakibul Islam 122-23-3044 Partha Protim Biswas 122-23-3052 Md.Hasan-uzzam 121-23-2934 Group 3. A continuous system of spinning in which twist is inserted into a yarn by using a circulating traveler.The yarn is wound on to the package since the rotational speed of the package is greater that of traveler.The main purpose of ring frame machine is to produce different types of yarn from roving by required drafting & twisting. The ring spinning machine was first invented in 1828 by the American Thorp. In 1830, another American scientist, Jenk, contributed the traveler rotating on the ring. There have been many development has done in ring spinning machine for the last years but the basic concept remained unchanged. Ring frame machine 4. Apron: A typical rubber compound for the outer or inner layer of an apron contains the base polymer as well as between 10 and 15 different additives, which also affect the various physical and mechanical properties of the various aprons. Basically, aprons made of synthetic rubber are made in endless tubular form whereas leather or synthetic leather aprons are made open in strips and subsequently glued together to form an apron. The advantage of the tubular construction is the lack of a seam. The apron is uniform along its entire circumference. Aprons for use on ring spinning machines and roving frames are made of three layers; in some special applications used in the long staple spinning they only have two layers. It has a thickness of about 1mm and held taut by tensioning device Parameter of different parts of ring frame machine 5. Figure of apron 6. The apron guide and transport the fibres during drafting and they exert a very significant influence on the drafting operation. The guiding length, refered to as the creadle length, must be adapted approximately to the staple length. 7. Content Front Back Top Roller 28mm 28mm Bottom Roller 28mm 25mm Modern Drafting System SKF PK 225/2025 drafting system: 1.Roller Diameter: 2.Roller Pressure: Front Pair 10-18 dan Middle Pair 10-14 dan Back pair 12-16 dan To increase the fiber gripping,roller pressure should be increased. 8. 3.Top roller pressure system is pendulum arm with pneumatic weighting/ spring loaded or magnetic weighting. 4.Roller Setting Distance: Modern Drafting System Apron Cradle Hf(mm) Vf(mm) Gf(mm) Fiber Length Short 44 50-60 40 Medium 55 60-70 Max 143 51 Long 68 Maximum 61 9. 5.Total draft-Up to 60 6.Amount of break draft 12-14 7.Apron always exit in front zone. 8.Better fiber controlling is obtained. 10. Ring diameter, flange width and ring profile depends upon the fibre, twist per inch, lift of the machine,maximum spindle speed, winding capacity etc. Operating speed of the traveller has a maximum limit, because the heat generated between ring and traveller should be dissipated by the low mass of the traveller with in a short time available. If the cotton combed yarn is for knitting, traveller speed will not be a limiting factor. Since yarn TPI is less, the yarn strand is not strong enough. Therefore the limiting factor will be yarn tension. Following points to be considered Ring & Traveller 11. 1) For 12s to 24s , 42mm ring with 180 mm lift can be used 2) For 24s to 36s, 40 mm ring with 180 lift can be used 3) For 36s to 60s , 38 mm ring with 170 mm lift can be used4) For 70s to 120s, 36 mmring with 160 mm lift can be used. 5) If winding is a problem, it is better to go for reduced production with bigger ring dia. Ring & Traveller 12. 6) Anti-wedge ring profile is better, because of better heat dissipation 7) Elliptical traveller should be used, to avoid start-up breaks in hosiery counts 8) Special type of travller clearer can be used to avoid accumulation of fibre on the traveller as traveller with waste does not perform well during start-up. Ring & Traveller 13. Ring & Traveller 14. Traveller Number or size of traveller: Here, if the weight of 10 traveller is 10 grains then the number of those traveller is 1 and so on. Recommended traveler no. for various yarn counts: Count (Ne) Traveller No. 16 2 20 1-2/0 30 3/0-4/0 40 6/0-8/0 50 10/0-12/0 60 13/0-15/0 80 16/0-19/0 100 19/0-20/0 15. The strength of a thread twisted from staple fibres increases with increasing twist, upto certain level. Once it reaches the maximum strength, further increase in twist results in reduction in yarn strength Coarser and shorter fibres require more Twist per unit length than finer and longer fibres Twist multiplier is a unit which helps to decide the twist per unit length for different counts from the same raw material.This is nothing but the angle of inclination of the helical disposition of the fibre in the yarn. This is normally expressed as TWIST PER INCH = TWIST MULTIPLIER * SQRT(Ne) TWIST 16. If the two yarns are to have the same strength, then the inclination angles must be the same For 40s combed knitting application, if the average micronaire of cotton is 3.8 and the 2.5% span length is around 29 mm, Twist multiplier of 3.4 to 3.5 is enough . If the average micronaire is around 4.3, it should be around 3.6 to have better working in Ring frame. Cotton combed knitting T.M. = 3.4 to 3.6 Cotton combed weaving T.M. = 3.7 to 3.8 Cotton carded knitting T.M. = 3.8 to 4.0 Cotton carded weaving T.M. = 3.9 to 4.2 The above details are for cottons of 2.5% span length of 27 to 30 mm and the average Micronaire of 3.7 to 4.4. For finer and longer staple, the T.M. will be lower than the above. 17. In general for processing poly/viscose , the T.M. is as follows: 51 mm, 1.4 denier fibre : T.M. = 2.7 to 2.9 for knitting application 51 mm, 1.4 denier fibre : T.M. = 2.9 to 3.1 for weaving application 44 mm, 1.2 denier fibre : T.M. = 2.9 to 3.0 for knitting application 44 mm, 1.4 denier fibre : T.M. = 3.0 to 3.1 for knitting application 38 mm, 1.2 denier fibre : T.M. = 3.1 to 3.3 for knitting application 18. Others: The following ROVING parameters will affect the ring frame process parameters Roving T.M. Bobbin weight Bobbin height 19. Some Important Parameter: Usually used ring diameter: 33, 36, 38, 40, 42, 45 mm Ring cup diameter: Empty bobbin dia. = 2:1 or 2.5:1 bobbin length = 5 x Ring Diameter Bobbin lift = Bobbin length 20mm