Abstract:
In Bangladesh, jute mills are producing
conventional yarns heavier than 275 tex. These
are used as hessian, sacking, carpet backing cloth
etc. For diversified uses of jute it is most essential
to produce medium count yarn of 241 to 275 tex.
In this regard, slip draft spinning machine has
been studied. This machine is capable to produce
yarn of 241 to 280 tex at flyer speed of 2900 rpm
to 4850 rpm. But there is a relation between flyer
speed and yarn breakages of the machine. In
addition spinning efficiency of the machine also
depends on the yarn breakages. Through a series
of experiment, a relation has been established
between flyer speed and yarn breakages of the
experimental machine for production of jute yarn.
From the experimental observation, it shows that
for production of 241 tex jute yarn 4700 rpm flyer
speed is the most suitable speed and 4800 rpm
flyer speed is the most suitable speed for
production of 275 tex jute yarn. In addition
productivity of the machine also maximum at that
flyer speed of the machine. In this experimental
study, it was found that at 4850 rpm it was very
difficult to spin yarn due to its random breakages.
That consequently lowered the productivity.
Therefore, it is necessary to select proper flyer
speed for the production of yarn of particular
linear density (tex). It was also observed that the
number of breakages increased with the increase
of flyer speed. At 2900-rpm flyer speed, the yarn
breakage was 0.8/ spindle-hr and at 4850 rpm the
yarn breakages is 3.5/spindle-hr. for producing
241 tex jute yarn. Almost all jute mills of
Bangladesh have been slip draft spinning
machine. Using proper flyer speed, which was
found from the experiment, can use the machine
in production of medium count jute yarn. The
produced yarn can replace the
synthetic/manmade fibre in the world textile
market.
