Sustainable Value Additions for Textile Machinery Processes

By :   M.M.Biradar 

The engineering professionals must always put their best efforts on the manufacturing floor with innovative experiments and making them successful by adding value to the process for long term sustainability of the organization. Here, few experiments and their results are discussed.

1) Common Tube Suction System: In Ring Spinning, the lapping on rollers – either on top or bottom roller – is one of the chronic issues, especially in PV fiber dyed Spinning at higher and higher spindle speeds. The huge amount of physical effort is required in removing lapping and joining broken threads. If it is too high, it affects workload of operators also. There are two options to reduce lapping frequency on the rollers in ring frames. Either use of higher capacity suction motor to increase the suction pressure or reduce number of openings on suction ducts. The Common Tube Suction System will help us to improve suction and reduce the breakages in LR6 ring frames. The suction is improved by 40% with common tubes compare to earlier tubes.

Study On Hairiness Reduction in Nozzle – Ring Spinning: Role of Air Drag Forces and Angle of Impact of Air Current Study On Hairiness Reduction in Nozzle – Ring Spinning: Role of Air Drag Forces and Angle of Impact of Air Current

By :   R. S. Rengasamy & Asis Patnaik

Abstract

In this paper we report on the effect of axial angle of air inlets of air-nozzles on yarn hairiness reduction in Ring spinning. Simulation of airflow was carried out using Computational Fluid Dynamics Software (CFD) to compute drag forces acting on yarn and hairs. Nozzle-Ring yarns have lower hairs compared to control yarn in all hair-length groups. The drag forces play an important role in reducing yarn hairiness. It is observed that the angle of air inlets decides the direction of impinging of air on the hair and hairiness reduction.

Introduction

The hairiness of yarns can be controlled by placing an air-nozzle at winding machine or at ring frame; the later is termed as ‘Nozzle-Ring spinning’. Nozzle positioning, mechanism of hairiness reduction and effect of nozzle and process parameters on hairiness reduction are discussed in a series of papers. In this study we report on the role of axial angle of air inlets on airflow velocity and their effects on hairiness using results of airflow simulation and experiments.

Energy Saving – A need of the Hour in Present Scenario

By :   M.M.Biradar

The machinery manufacturers have developed many energy conserving ancillaries to reduce energy consumption. Ring spinning is a major consumer of energy and it accounts for 50% of total spinning mill consumption. Studies conducted by SITRA in modern ring frames revealed that about 1/3 of total machine power is spent in driving the spindles. The design and construction parameters of spindle tapes are one of the factors affecting the power consumption of spindles. With this background, we conducted study of new spindle tapes made by thermoplastic polyurethane material.

These W-8 tapes are made of Thermoplastic Polyurethane material and reduce the bending resistance of new spindle tapes significantly, the efficiency of transmission improves due to higher co-efficient of friction at the pulley side and it is reflected in the speed of spindles. The another important aspect of W-8 spindle tapes is the flex proof because the joining area is like the English letter W which does not offer any resistance to the movement of spindle. The experiments were carried out on a modern high speed LR6 ring frame. The spindle speed was measured for both spindle tapes during the study to see their transmission efficiency. The below table shows the increase in spindle speed in this study.

Increase in Spindle Speed with W-8 Tapes

 It can be seen from the above table that new W-8 spindle tapes always gives higher spindle speed. The increase in spindle speed is due to higher dynamic frictional co-efficient of new tapes. The transmission efficiency of new spindle tape is higher by about 2.33% in our study (423 rpm) as compared with existing HS-5 tapes. This higher speed is due to low slippage of W-8 Spindle tapes.

In this study, care must be taken for TPI correction because change of tapes increases the spindle speed by 423 rpm without any change in delivery speed of front roller. Hence there is increase in TPI in the yarn which we do not require at all in the yarn and higher TPI than recommended is enemy of productivity. In our study, change in TPI is 2.36% on higher side. This increase in twist per inch is altered by suitable twist combination wheels to get nominal twist per inch in the yarn and you see change of TPI as given in table blow.

The author is a Senior Manager & HOD Spinning PV, Raymond Ltd, Chhindwara (M.P).