Quality control department runs by the direction of a quality assurance manager (most of the cases). Quality of a product is checked in the different manufacturing stages of a product. During quality assurance they follow different international quality standard. Q.C department also take help from CCMS for measuring the quality of a textile material.
Here, I have given a flow chart of quality assurance diagram from spinning to garments. I think most of the textile manufacturing company follow it.
Pass ————- Fail
Knitting Send to spinning mill
Grey fabric inspection
Pass ————– Fail
Grey store Send to store as reject
Drying / stentering
Lab Inspection (Shade)
Pass ————– Fail
Delivery Send to store as reject
Send to concern Department
Fabric Inspection is done in grey form or finished form. The inspection of fabric is a procedure by which the defects of fabric are identified and fabric is classified according to degree or intensity of defects. The fabric inspection is done for both grey and finished fabric.
Grey Fabric Inspection: After producing grey knit or woven fabric it requires to check out any types of fabric faults before sending in dyeing section. Most of the fabric manufacturing companies inspect grey fabric according to 4 point system.
Finished Fabric Inspection: The final product should pass against the norms given by the buyer. The following tests are done-
- Shade check
- GSM test
- Width or diameter test
- Shrinkage test
- Crocking test
- Pilling resistance test
- Color fastness to wash
- Color fastness to water
- Color fastness to perspiration
- Dimensional stability
- WPI & PPI
Different types of fabric faults can be found in a dyed finished fabric. The following defects are found in the final inspection.
- Uneven shade
- Oil spot
- Crease mark
- Machine Stoppage mark
- Line mark
- Pick missing
- Double yarn
- Dead cotton
- Fly yarn contamination
So, find out the defects of the finished goods and try to reduce the faults of the fabric.
Dimensional stability is the vital characteristics of a fabric. It is required to confirm about the dimensional stability of a dyed fabric. If you think that, you buy a t-shirt from the market as your required size but after first wash its size becomes small or large than your required size then you will be upset. So, it required to know about the dimensional stability.
Dimensional stability test is an off line quality assurance system. By this test, we can be confirming about the shrinkage and spirility properties of a fabric. After dyeing and finishing operation; dimensional stability test is carried out. Dimensional properties can be changed by stentering, compacting or by treating the fabric with finishing chemicals.
Procedure Of Dimensional Stability Test: Here, I have described about the dimensional stability test for your consideration. By the following way we can test shrinkage and spirility of a fabric.
Sample: Two piece of 50 cm x 50 cm fabric is taken for test.
- Conditioning: Put the sample in the table for 4 hours for conditioning before starting test.
- Cut the sample 50 x 50 cm & benchmark should be 35 x 35 cm. Stitch the sample (3 sides) by over lock sewing machine.
- Put sample in washing machine and run according to buyer’s choice.
- Drying: All Buyers’ requirement is tumble Dry except ECHO SCOURING is flat dry.
Shrinkage test calculation:
Shrinkage % = (Before wash – After Wash) / Before Wash
Spirality test calculation:
S= (S1+ S2)/2
Spirality = (S+S X L)/100.
S1 = The right side distance of the specimen from the stitch line wash.
S2 = The left side distance of the specimen from the stitch line after wash.
L = Length before wash.
Above test is performed depending on quality standard: ISO – 9001:2000.