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Knitting Caluculations

This document provides examples of calculating knitting machine production. Production is calculated based on machine specifications like gauge, diameter, RPM, and yarn count. The number of stitches and yarn consumption in yards per hour is calculated. Given the yarn count, yards of yarn consumed can be converted to weight of production. For a single jersey machine, production of 87.85kg over 8 hours is calculated. For a rib machine, production is calculated as 92.22kg over 8 hours. Nominal hourly production of 31.23kg is calculated for a single jersey machine based on gauge, diameter, feeders, RPM, stitch length, and yarn count.

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Chamal Jayasinghe
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414 views4 pages

Knitting Caluculations

This document provides examples of calculating knitting machine production. Production is calculated based on machine specifications like gauge, diameter, RPM, and yarn count. The number of stitches and yarn consumption in yards per hour is calculated. Given the yarn count, yards of yarn consumed can be converted to weight of production. For a single jersey machine, production of 87.85kg over 8 hours is calculated. For a rib machine, production is calculated as 92.22kg over 8 hours. Nominal hourly production of 31.23kg is calculated for a single jersey machine based on gauge, diameter, feeders, RPM, stitch length, and yarn count.

Uploaded by

Chamal Jayasinghe
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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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 of calculating the production of a machine is as follows. In this
method the following information for production calculation are required:

 Machine Guage and Dia


 RPM of Knitting Machine
 Yarn Count
 Stitch Length
Production Calculation of Knitting

Example 01:

Find out the production per shift for a single jersey and rib from the following
data:

For a single jersey,

1. Fabric width = 53 “, GSM = 150 , Yarn count(Ne) = 26S


2. Stitch length = 2.85 mm, Cylinder Dia(D) = 25″, Cylinder Gauge(G)
= 24
3. No. of feeder = 75, R.P.M.of cyl.= 25, Time =8 hrs, Effi.= 80%
Solution:

Production/8hrs,

….πDG X S.L (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,

1. Fabric width = 41″, GSM = 460 , Yarn count,Ne = 24S


2. Stitch length = 2.90 mm, Cylinder dia,D= 32″, Cylinder Gauge,G= 18
3. 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 01:
First, we will calculate the number of needles and the 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 an even number so we will take the nearest
even figure)

Number of stitches produced in revolution


Every needle is making one stitch on every feeder because the machine is
producing a 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 02:

The length of the stitch is 04 mm (stitch length is always calculated in a 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 03:
In the previous step, we calculated the quantity of yarn consumed in yards. We
can easily calculate the 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

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