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Knitting Calculation:: Yarn Count

This document provides examples of how to calculate the production of knitting machines. It explains that production is calculated by weighing the total output over a period of time, like an hour or shift. It then gives steps to calculate production based on machine details like diameter, gauge, RPM, yarn count and stitch length. Two examples are provided to demonstrate how to calculate the kilograms of production for different knitting machine configurations and fabric types, like single jersey and rib, over an 8 hour shift.

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Gustavo G. Garcia Ochoa
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366 views4 pages

Knitting Calculation:: Yarn Count

This document provides examples of how to calculate the production of knitting machines. It explains that production is calculated by weighing the total output over a period of time, like an hour or shift. It then gives steps to calculate production based on machine details like diameter, gauge, RPM, yarn count and stitch length. Two examples are provided to demonstrate how to calculate the kilograms of production for different knitting machine configurations and fabric types, like single jersey and rib, over an 8 hour shift.

Uploaded by

Gustavo G. Garcia Ochoa
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Knitting Calculation:

Production calculation of knitting means calculation of knitting machine production. To


calculate knitting machine production by weighing the total production of one hour or one
shift or one day.

Knitting machine

The practical way calculating production of a machine is as follows. In this method


following information for production calculation are required:

 Machine Guage and Dia


 RPM of Knitting Machine
 Yarn Count
 Stitch Length
Example 01:  
Find out the production per shift for single jersey and rib from the following data:

For single jersey,

Fabric width = 53 "


GSM = 150
Yarn count (Ne) = 26S
Stitch length = 2.85 mm
Cylinder Diameter (D) = 25"
Cylinder Gauge( G) = 24”
No. of feeder = 75
R.P.M. of the cylinder= 25
Time work =8 hous
Efficience = 80%

Solution:
 
Production/8hrs,

    πDG X Stitch Length (mm) X No. of feeder X RPM X 60 X 8 X Efficiency


= ……………………………………………………………………………… kg
                       2.54 X 36 X 840 X 26 X 2.2046

    3.1416 X 25 X 24 X 75 X 25 X 60 X 0.80


= ………………………………………………………………………………kg
           2.54 X 36 X 840 X 26 X 2.2046

= 87.85 kg (Ans)

For Rib,

Fabric width = 41", GSM = 460 , Yarn count,Ne = 24S


Stitch length = 2.90 mm, Cylinder dia,D= 32", Cylinder Gauge,G= 18
No. of feeder = 62, R.P.M.of cyl.= 15, Time =8 hrs, Effi.= 80%

Production/8hrs,

   πDG X S.L (mm) X No. of feeder X RPM X 60 X 8 X Efficiency X Feeder/course (kg)


= ……………………………………………………………………………................
…………
                                      2.54 X 36 X 840 X Ne X 2.2046

   3.1416 X 32 X 18 X 2.90 X 62 X 15 X 60 X 8 X 0.80


= ………………………………………………………………….. X 2 kg
               2.54 X 36 X 840 X Ne X 2.2046

= 92.22 kg (Ans)

Example 02:
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 X Gauge X p (3.14)

= 30 X 24 X 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 feeder because machine is producing single
jersey fabric (full knit fabric).

Number of stitches produced in one revolution = Number of needles X Number of


feeders

= 2260 X 90

= 203400

This 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 we can calculate yarn consumption in yards in one hour

Yarn Consumption (in yards) in one hour,

   Number of stitches X length of (mm) X RPM X60 (minutes)


= ……………………………………………………………..
                   1000(to convert mm into meters)

    203400 X 4 X 26 X 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 X 840

    1388015
= …………………..
   Count X 840

= 68.85 pounds or

= 31.23 Kilo grams

Efficiency 85% = 26.55 Kilo grams

Answer: This machine can produce 26.55 Kgs fabric in one hour at 85 % efficiency

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