REPORT ON A PROJECT AIMED AT INCREASING THE STRENGTH OF FRICTION SPUN YARN BY USING A FALSE TWIST PROCESS

The lower strength of friction spun yarns has became a key problem that hinder the develop-ment of friction spinning,especially in high speeds and fine yarns.In this paper a project aimed atincreasing the strength of friction spun yarns by using a false twist process has been made.In re-ported experiment false twist was inserted into the yarn which has been formed on a friction spin-ning machine,so that it made the yarn untwist at first,then regain the twist.In the meantime draftwas applied to generate more tension than that which had been experienced during yarn formationon the friction spinning machine.It made the yarn reforming and the loosely bound fibres in thefriction spun yarn formed due to extremely low tension on the friction spinning machine becametighter.Results indicate that with the proper draft,tension and false twist the tenacity of processedyarn will increase more than 10%.This project is an attempt to discover whether improvements can be made and whether it isworth pursuing research into modifications of yarn structure.The results imply that if the yarntension can be raised during yarn formation on the friction spinning machine or a chance is offeredto the yarn to reform after the yarn formation the yarn tenacity will be increased obviously.

REPORT ON A PROJECT AIMED AT INCREASING THE STRENGTH OF FRICTION SPUN YARN BY USING A FALSE TWIST PROCESS

The lower strength of friction spun yarns has became a key problem that hinder the develop- ment of friction spinning,especially in high speeds and fine yarns.In this paper a project aimed at increasing the strength of friction spun yarns by using a false twist process has been made.In re- ported experiment false twist was inserted into the yarn which has been formed on a friction spin- ning machine,so that it made the yarn untwist at first,then regain the twist.In the meantime draft was applied to generate more tension than that which had been experienced during yarn formation on the friction spinning machine.It made the yarn reforming and the loosely bound fibres in the friction spun yarn formed due to extremely low tension on the friction spinning machine became tighter.Results indicate that with the proper draft,tension and false twist the tenacity of processed yarn will increase more than 10%. This project is an attempt to discover whether improvements can be made and whether it is worth pursuing research into modifications of yarn structure.The results imply that if the yarn tension can be raised during yarn formation on the friction spinning machine or a chance is offered to the yarn to reform after the yarn formation the yarn tenacity will be increased obviously.