Cost Comparison of Yarn Manufacturing in Different Countries
Cost Comparison of Yarn Manufacturing in Different Countries
Cost Comparison of Yarn Manufacturing in Different Countries
different countries
Cost of yarn manufacturing consists of several factors such as raw material energy or
power, labor, capital etc., it exclude the cost of raw material as termed manufacturing
cost. The share of factors in manufacturing cost changes according to yarn properties,
machine operational properties & economic situation of the spinning mill.
Cost of yarn consists of several factors such as raw material energy or power, labor,
capital etc. Yarn cost of excluding raw material is termed manufacturing cost. Share of factors
in manufacturing cost changes according to yarn properties, machine operational properties
& economic situation of spinning mill.
Table illustrates general shares of cost factors for 20 tex combed cotton yarn among
chosen countries. Raw material (fiber) forms nearly half of yarn’s total cost and other cost
factors such as labor, energy, capital cost of machines, auxiliary material cost & waste
make up remaining part. After raw material, capital & energy costs have the highest
proportions in total. Energy cost takes 9% share of specific yarn total cost in Turkey. This
share increases to 17% if raw material cost is excluded. Since unit price of energy & labor
change independently from spinning mill conditions, reducing these costs depends on
minimizing energy usage & labor wages. Since twisting is accomplished by rotation of
spindle & bobbin, energy consumption of ring spinning is higher than other spinning
systems. In ring spinning system, energy is used for feeding roving to machine. An
investigation on energy consumption in yarn production with special reference to ring
spinning drafting & rotation of spindle. At least, 85% of total power requirement of a ring
frame is consumed in driving spindles, depending on details such as yarn count, package
size & spindle speed & remainder is consumed by drafting & lifter mechanisms.
Waste 7 11 7 6 8 8 6
Labor 2 2 2 24 8 4 19
Energy 4 8 12 10 6 9 6
Auxiliary material 4 4 5 3 4 4 4
Capital 32 14 23 17 21 26 21
Conclusion
Compared the calculated cost of 20 tex ring, open-end and Vortex (MVS) yarns were
compared with each other. It was found that energy cost of 1 kg of ring yarn is the highest
of the three. Cost factors which make up total product cost for textile industry including
spinning, weaving & finishing & product cost of chosen ring yarn by using empirical
formulas, taking into regard specific operating conditions and selected machine
parameters
Energy is necessary for each step of spinning processes to drive machines, air
conditioning & lighting, but the highest energy consumption occurs during spinning
process in spinning machines. Another study which handled energy conservation in
textile industry focused on electricity consumption of each step of ring spinning for
modern and traditional factory. Electrical energy consumption of 1 kg of yarn changes
between 2.7 kWh/kg & 4 kWh/kg. Additionally, it was pointed out that thermal energy
alternating between 1.1 MJ/kg & 4.7 MJ/kg is necessary for processes such as fixation
besides electrical energy needs. General assessment for energy consumption &
conservation in fiber-producing & textile industries was done while determining power
requirement of a specific ring & open-end spinning machine with chosen machine
parameters.
Since the highest power is required in spinning machines, many studies have been carried
out to determine power demand of spinning machines. It was found that in coarse yarn
range (tex > 60) open-end rotor machine needed less energy per kg of yarn than ring
frame for warp yarns, for finer yarns (tex<30), on other hand, OE-rotor machine
demanded more energy per kg of yarn than ring frame. It was reported that factors
affecting power demand of ring system were ring diameter, balloon height, spindle speed
and traveller mass.
Two types of energy can be used in a specific spinning mill; electrical energy & thermal
energy. Machines, air conditioning, lamps used for illumination & compressors consume
electrical energy while thermal energy is consumed by air conditioning & processes such
as fixation of yarns