· RING AND TRAVELLER:
· Ring diameter, flange width and ring profile
depends upon the fibre, twist per inch, lift of the
machine,maximum spindle speed, winding capacity etc.
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.
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.
TPI is less, the yarn strand is not strong enough. Therefore the limiting factor will be yarn tension.
· Following points to be considered
- for 12s to 24s , 42mm ring with 180 mm lift can be used
- for 24s to 36s, 40 mm ring with 180 lift can be used
- for 36s to 60s , 38 mm ring with 170 mm lift can be used
- for 70s to 120s, 36 mmring with 160 mm lift can be used.
- If winding is a problem, it is better to go for reduced production with bigger ring dia.
- Anti-wedge ring profile is better, because of better heat dissipation
- Elliptical traveller should be used, to avoid start-up breaks in hosiery counts
- 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.
· For polyester/cotton blends and cotton
weaving counts yarn strength is not a problem. The limiting
factor will be a traveller speed. For a ring diameter of 40 mm, spindle speed upto 19500 should not
be a problem. Rings like Titan(from Braecker), NCN(bergosesia) etc, will be able to meet the requirements.
factor will be a traveller speed. For a ring diameter of 40 mm, spindle speed upto 19500 should not
be a problem. Rings like Titan(from Braecker), NCN(bergosesia) etc, will be able to meet the requirements.
· For spindle speeds more than 20000 rpm, ORBIT
rings or SU-RINGS should be used. As the area of
contact is more with this rings, with higher speeds and pressure, the heat produced can be dissipated without any problem. Normal ring and traveller profile will not be able to run at speeds higher than 20000 to produce a good quality yarn.
contact is more with this rings, with higher speeds and pressure, the heat produced can be dissipated without any problem. Normal ring and traveller profile will not be able to run at speeds higher than 20000 to produce a good quality yarn.
· ORBIT rings will be of great
help, to work 100% polyester at higher spindle speeds. Because,
of the tension, the heat produced between ring and traveller is extremely high. But one should understand,
that ,the yarn strength of polyester is very high. Here the limiting factor is only the heat dissipation.
Therefore ORBIT RINGS with high area of contact will be able to run well at higher spindle speeds when processing 100% polyester.
of the tension, the heat produced between ring and traveller is extremely high. But one should understand,
that ,the yarn strength of polyester is very high. Here the limiting factor is only the heat dissipation.
Therefore ORBIT RINGS with high area of contact will be able to run well at higher spindle speeds when processing 100% polyester.
· While running 100% cotton, the fibre dust in
cotton, acts like a lubricant. All the cottons do
not form same amount of lubricating film. If there is no fibre lubrication, traveller wears out
very fast. Because of this worn out or burn out travellers, microwelding occurs on the ring surface,<
which results in damaged ring surface, hence imperfections and hairiness increases in the yarn.
not form same amount of lubricating film. If there is no fibre lubrication, traveller wears out
very fast. Because of this worn out or burn out travellers, microwelding occurs on the ring surface,<
which results in damaged ring surface, hence imperfections and hairiness increases in the yarn.
· Lubrication is good with west african
cottons. It may not be true with all the cottons from
West africa. In general there is a feeling, cottons from Russia, or from very dry places, lubrication
is very bad. If the fibre lubrication is very bad, it is better to use lighter travellers and change
the travellers as early as possible.
West africa. In general there is a feeling, cottons from Russia, or from very dry places, lubrication
is very bad. If the fibre lubrication is very bad, it is better to use lighter travellers and change
the travellers as early as possible.
· Traveller life depends upon the type of raw
material, humidity conditions, ringframe speeds,
the yarn count, etc. If the climate is dry , fibre lubrication will be less while processing cotton.
the yarn count, etc. If the climate is dry , fibre lubrication will be less while processing cotton.
· Traveller life is very less when Viscose
rayon is processed especially semi dull fibre, because of
low lubrication. Traveller life is better for optical bright fibres.
low lubrication. Traveller life is better for optical bright fibres.
· Traveller life is better for Poly/cotton
blends, because of better lubricatiion between ring and
traveller.
traveller.
· Because of the centrifugal force excerted by
the traveller on the yarn, the particles from the fibre
fall on the ring where the traveller is in contact. These particles act like a lubricating film between
ring and traveller.
fall on the ring where the traveller is in contact. These particles act like a lubricating film between
ring and traveller.