4 Point system for fabric inspection is
widely used in apparel industry for fabric quality inspection. To use this system
you have to know following things.
- Fabric inspection method or preparation
- Criteria of giving penalty points based on defects and defect length.
- Calculation method of total penalty points for total defects found in a fabric roll or thān
- A Check sheet or format for recording data
- Knowledge of different types of defects (how a defect looks and its appearance)
Fabric inspection method or
preparation
Details of selection method of fabric
rolls and checking of fabric have been explained in our previous post. Please
read one of our guest articles for the method fabric inspection. Essential Fabric Quality Reports for Bulk Cutting
Approval of Fabrics
Criteria for giving penalty
points
In the following table the penalty
evaluation points has been given for different length of fabric defect and
dimension of holes.
Table -1
|
Size of Defect
|
Penalty Points
|
|
Length of defects in
fabric (either length or width)
|
|
|
Defects
up to 3 inches
|
1
|
|
Defects
> 3 inches < 6 inches
|
2
|
|
Defects
> 6 inches < 9 inches
|
3
|
|
Defects
> 9 inches
|
4
|
|
Holes and
openings(largest dimension)
|
|
|
1
inch or less
|
2
|
|
Over
1 inch
|
4
|
Calculation of total points
per yards
In 4 point system fabric quality is
evaluated by unit points/100 sq. yds.
Points / 100 sq. yd. = (Total points in
roll * 36 * 100)/ (Fabric length in yards * Fabric width in inches)
Normally fabric roll containing 40
points per 100 square yard are acceptable.
Also Read: 4 Point System - Acceptable Level
Example: A fabric roll 120
yards long and 46 inch wide contains following defects.
|
4
defects up to 3 inch length
3
defects from 3 to 6 inch length
2
defects from 6 to 9 inch length
1
defect over 9 inch length
1
hole over 1 inch
|
4 x
1
3 X
2
2 X
3
1 X
4
1 X
4
|
4
points
6
points
6
points
4
points
4
points
|
|
Total
defect points
|
24
Points
|
|
|
Therefore,
Points/
100 sq. yards
|
=
(24 X 3600)/(120 X 46)
=
15.652 points
|
|
Check sheet or Inspection
Format
To record or to collects defects during
inspection you must use a simple check sheet. A check sheet includes general
details, details of fabric lot, fabric defects according their sizes, summary
of fabric defects, quantity inspected and total penalty points and result of
the fabric lot after inspection. Use tally marking for recording of number of
defects. A sample 4 point system fabric inspection format has been attached at
the bottom.
Types of defects found in
fabric
Fabric checker should know common
defects found in fabrics and he must recognize defects on the fabric at the
time of fabric inspection. A detailed list of fabric defects has been
posted earlier. Open the link to read the post for your reference.
Image: Sample format for 4-Point system
for fabric inspection.
 |
| Click on the Image to Zoom. |
