How to
Calculate Thread Consumption for Garments?
Abdullah Al Mamun
Assistant Manager-IE
Fareast Knitting & Dyeing Industrial ltd
E-mail: ie.mamun@fareastknit.com
In today's competitive
marketplace, there is a need for tight cost control. A realistic estimation of
potential thread requirements for particular garment styles or contracts will
not only save you money, but also enable you to use a superior thread for the same
cost, thereby not compromising on garment quality. There is standard formula
for determining thread consumption for apparel products. In that formula you
will get multiplying factors according to machine type and stitch class. To
determine thread consumption you just need to multiply seam length with those
factors. This way one can estimate total thread requirement for making a
garment.
Actual thread consumption for a unit length of seam depends on following factors.
Ø
Stitch
Classes
Ø
Stitches per
inches (SPI)
Ø
Thickness of
the seam (fabric thickness)
Ø
Thread
tension
Ø
Thread
count (thickness of sewing thread)
The thread consumption for a
particular sewn product can be calculated in many ways.
Step 1: To calculate thread ratio, you need a
sewing machine, fabric and sewing thread that will be used for bulk production.
Step 2: Sew a seam of 12 cm long and take 10 cm
seam out of it by trimming 1 cm from both edges.
Step 3: Unravel both needle thread and bobbin
thread from the seam. Remove crimp from the unraveled thread and
measure its length in cm. Now
find the multiplying factor by dividing thread length with seam length.
Using this method you can find out any types of machines’ thread consumption factors.
Using this method you can find out any types of machines’ thread consumption factors.
Note:
- The above ratios are arrived at with a stitch density of 12 stitches per inch.
- These ratios are the prescribed minimum in regular conditions and marginally vary with the factors affecting thread consumption.
- A certain percentage of wastage is to be added to the above ratios as per shop floor conditions. It may vary from 10% to 15%.
By this ratio we easily calculate sewing thread consumption by using following format.
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