Ring Spinning Process Of Yarn Manufacturing

Ring Spinning:

Introduction

In ring spinning, Ingeo PLA fibers produce yarns of high elongation, good regularity and few imperfections. Ring frame settings are chosen mainly to reduce yarn hairiness and the risk of glazing or melting the fiber, particularly when considering twist and traveler selection.

Drafting

Back zone drafts should be between 1.12 and 1.20,although the roller setting is not critical on SKF type double apron drafting systems. For other systems, a close rear zone setting may improve yarn regularity. Roller settings should be as indicated in SKF manuals for synthetic fibers.
Main drafts should be higher than 15, and around 30 is the most common. Spacers and guides are chosen to suit the drafting system and yarn count. Apron types recommended by the main
manufacturers for short staple man-made fibers are usually acceptable, but they should not be
mixed top and bottom. Soft top rollers, as low as 65 Shore, will undoubtedly give the best yarn quality, but they are more susceptible to wear and damage. 70-75 Shore is an excellent compromise between quality and durability. Ingeo PLA has a low rate of roller lapping, and end break rates below 10/1000 spindle hours should be expected on modern machinery. High roller pressure is commonly used for coarse counts and low drafts, but this is unnecessary for finer counts.

Twist

Ingeo PLA yields reasonably strong yarns and only in exceptional cases will the twist level be chosen to give maximum strength. Usually an alphaM of 110 (3.6TF) or above is recommended for knit applications, with 116 (3.85TF) for woven applications, especially warps.

Travelers

Yarns made with Ingeo PLA can be produced at rates similar to those for the majority of man-made fibers. A traveler speed of about 30 m/sec maximum (about 12,000 rpm on a 48 mm diameter ring) is typical for a 50-70 Nm (30-40 Ne) yarn. The traveler weight is dependent on speed, tube size,lift, etc. but different weights can reduce hairiness.

Traveler style will vary from mill to mill though usually draw (half round wide) types are used. Any traveler finish can be used and traveler wear is normal. The low melting point of the fiber must also be kept in mind when considering the choice of traveler and actual production rates. New ring frames with programmed speed controls at the start and end of the spin cycle are clearly advantageous in this respect.