Calculate nominal production of a single jersey-knitting machine per hour from the data given:
Machine Gauge 24
Machine Dia 30 inches
Number of Feeders 90
Machine RPM 26
Yarn Count 24
Stitch length 4 mm
Efficiency 85%
Solution:
Step one
First
we will calculate number of needles and number of stitches produced in
one revolution. This would help us in calculating the total length of
yarn consumed in one revolution.
Number of needles = machine dia * gauge * p (3.14)
= 30* 24*3.14
= 2260 (exact 2260.8 but needles are
always in even number so we will
take nearest even figure)
Number of stitches produced in revolution
Every needle is making one stitch on every feeders because machine is producing single jersey fabric (full knit fabric).
Number of stitches produced
in one revolution = Number of needles * number of feeders
= 2260*90
= 203400
This figure shows that machine is making 203400 stitches in one revolution.
Step Two
Length of stitch is 04 mm (stitch length is always calculated in metric system)
From this figure we can calculate yarn consumption in yards in one hour
Yarn Consumption (in yards) in one hour
= number of stitches * length of (mm) * RPM *60 (minutes)
1000(to convert mm into meters)
=203400 * 4 * 26 * 60
1000
= 1269216 meters or
= 1388015 yards
Step Three
In
previous step we calculated quantity of yarn consumed in yards. We can
easily calculate weight of this yarn while its count is known (see
example 03).
Weight of cotton yarn = length of yarn
Count * 840
= 1388015
840 * 24
= 68.85 pounds or
= 31.23 Kilo grams
Efficiency 85% = 26.55 Kilo grams
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