This is a guest contribution from Ashish Kumar Gupta
Fabric is the main raw material for garment manufacturing and it involves 60-70% of total garment cost. To ensure that only quality fabric is used in garments, factory takes precautionary measures and set up fabric inspection department with qualified personnel. Standard procedures of fabric inspection, preparing inspection report following international or national standards followed by top tier garment manufacturers have been explained in this article.
Fabric is the main raw material for garment manufacturing and it involves 60-70% of total garment cost. To ensure that only quality fabric is used in garments, factory takes precautionary measures and set up fabric inspection department with qualified personnel. Standard procedures of fabric inspection, preparing inspection report following international or national standards followed by top tier garment manufacturers have been explained in this article.
As per quality standards,
prior to bulk production cutting, factory prepares following three reports and
takes approval from authorised person.
- Fabric inspection report
- Fabric shrinkage report
- Shade band report for 100% fabric rolls (applicable for dyed and printed fabric).
The above three
reports are submitted for approvals within 48 hours of fabric inhouse.
According to Standard procedures (SOP), initially only 10% of the fabric
rolls is inspected on 4-Point System. If there is any doubt on acceptance further
10% of total fabric rolls are Inspected. Some manufactures prefer doing 100% fabric inspection in order
to get ensure that only quality fabric is cut and fed to the line. During 100%
inspection fabric inspectors mark all the defects so they can identify them
during spreading and replace the parts after cutting.
If fabric is cut
without being inspected, complete responsibility will be on fabric quality
inspection department as it is a violation of a critical aspect. Reports are
submitted to buyers & the relevant merchandiser.
1. Fabric Inspection
Report
Purpose: To decide acceptance or
rejections of fabric roll (For Woven). Fabric inspection is done using 4-point
system. Inspection procedure has been explained in the following table.
Activity
|
Requirement
|
1.
Select rolls
|
Roll to be chosen at random
|
2.
Check the roll as per 4 points system.
|
|
3.
Give penalty points for defects
|
|
4.
Calculate index for each individual
roll.
|
Points / 100 sq. yd. =
(Total points in
roll * 36 * 100)/ (Total length in yards
* width in inches)
|
5.
Calculate final average index for the
total no. of rolls inspected.
|
|
6.
Decide acceptance or reject of the
fabric
|
Penalty Point Evaluation
Defects in both
the wrap and weft directions for woven and course/wale directions for knits are
assigned point using the following criteria:
Points
|
Inches (”) | (mm) |
1 Point
|
Defects up to 3 inches
|
Up to 75mm
|
2 Point
|
Defects > 3 inches < 6 inches
|
Defects > 75mm< 150mm
|
3 Point
|
Defects > 6 inches < 9
inches
|
Defects > 150mm< 230mm
|
4 Point
|
Defects > 9 inches
|
Defects > 230mm
|
A continuous defect running 9 inches /
230mm or longer is assigned four points for each meter that occurs within the
shipment. Other important parameters to be considered during fabric inspection
are -
i) Length of the
faults is to be measured in the warp or weft direction and the direction in
which the fault is longest is the fault direction. However when the warp and weft
length are same and when the penalty of the shorter direction is heavier, take
the fault of the direction in which the penalty is heavier.
ii) When the fault in
the warp direction is over 1yd, the part which is over 1yd is deemed as fault
of the same kind of others.
iii) When two or more
faults overlap, apply only the faults which penalty is the heavier.
iv) When there are two
or more faults within the length of 1yd and the penalty points come over 4
points, the points over 4 points are not added.
v) The
inspector needs to be at a distance of 3 feet away from the inspection table
and the linear speed of inspection not to be less than 0.1 meters per second
when inspection is done on fabric inspection machine.
Standards
for Passing Fabric
Average index for inspected rolls
not to exceed» 28
points / 100yd²
Maximum index for any roll not to
exceed» 40 points / 100yd²
2. Fabric shade band
report:
For styles those required garment washing, before
and after wash blankets is submitted ( 3 sets each ) covering all rolls and it
is attached in the shade continuity card .
A 100% shade band covering all rolls & all colors pertaining to a
certain style / Consignment is made and get approved prior to cutting of bulk
Fabric.
Shade band preparation
Process
- No sooner the fabric is inhoused, the quality department collects fabric panels representing all rolls within 6 hours from store.
- Cut 6 inches from end of each roll. Join all panels by cover stitch in correct grain line direction to be in a blanket form.
- If the style is a non-wash program two sets is prepared.
- If the style consists of a certain wash, then 4 blankets is prepared - 2 blankets non-washed and 2 blankets with the exact approved wash of the style.
- Once the shade bands are ready, dye lot or color segregation is done. If the Shade Band consists of 2-3 different shades, such shades should be segregated into families marked A, B, C Etc. A copy of the segregation of shades is handed over to the store, cutting room, merchandising and production departments. Stores will issue and cutting and production department will proceed as per the segregated shades without getting mixed.
3. Fabric shrinkage
report:
A 100% Shrinkage report is submitted for all
styles and the washing shrinkage has to be performed as per the wash type
required for the bulk.
Garment fit is a very important factor in the
purchase decision of the customer. Misfit at any stage of the life of garment
can lead to premature rejection and earn a bad perception for the brand. A
garment is supposed to be washed after every use and expected to retain the
same fit and appearance during the lifetime of the garment. To fulfill this
fabric has to be tested for dimensional stability. For this shrinkage tests are
carried out is order to manipulate the patterns in the same ratio to avoid any
measurement problems after garment washing.
Shrinkage Templates (25cm*25cm or 50cm*50cm) are
used in industry to gauge the shrinkage % directly.
 |
| Fabric Shrinkage measurement template |
Features of Shrinkage Template and Scale:
- To determine directly the % dimensional change (shrinkage) in all types of fabrics.
- Fine calibrated Shrinkage Template with 25cm x 25cm" & 50cm" x 50cm" benchmarks length-wise & width-wise.
- Calibrated scale to evaluate shrinkage and stretch directly Up to 15%.
- Two fine tipped black and yellow fabric markers are used for accurate marking on light and dark colour fabrics.
How Shrinkage Template and
Scale works?
- The marking template should be placed on the specimen to be tested, making sure that the fabric is in flat position before marking.
- Hold the template firm, and carefully mark the fabric through the eight slots of the template, to ensure that it does not move.
- Now put the fabric in the washing machine or Dry Cleaning.
- Dry the sample as per specified method. It can either be Line Dry or Flat Dry or Tumble Dry.
- To find the dimensional change read the Shrinkage/Stretch on 3 points on the Wrap side and 3 points on Weft Side.
- Get the mean value of wrap-wise and weft wise readings to get the Accurate Shrinkage or Stretch.
If you don’t have a shrinkage template then you can calculate the
shrinkage or gain as directed in Equations 1 and 2 by marking fabric with help
of a simple scale.
 |
| Fabric shrinkage testing samples |
1. S = [(A - B)/A] x 100
2.
G = [(B - A)/A] x 100
Where:
A = distance between gauge marks before
wetout, 10 inches (254 mm)
B = distance between gauge marks after
wetout and drying
G = % gain (In reporting the gain, the
percent change shall have the prefix "+"
S = % shrinkage
|