There are two types of quality assurance system: online quality assurance system and off line quality assurance system.
Online quality assurance system: Online quality assurance system consists of raw material control and process control.
Raw materials control: The quality of raw materials has great impact on product. So the quality of raw materials with an economical consideration should be concerned.
1.Faults are now allowed to occur on the fabrics with proper absorbency, whiteness as per requirement of the subsequent process. The conditions of the raw fabrics are included on the Grege inspection report.
| Penalty point legends | Code |
| Hole | H |
| Oil stain | OS |
| Chemical stain | CS |
| Water spot | WS |
| Fly yarn | FY |
| Rub mark | R |
| Dye stain | DS |
| Dirt stain | D |
| Rust stain | RS |
| Yarn contamination | YC |
| Inspect spot | IS |
| Grease stain | GS |
| Missing yarn | MY |
| Drop stitch | DS |
| Needle line | NL |
| Uneven tension | UT |
| Stripe | S |
| Thick & thin place | TT |
| Slubs | SL |
| Sinker mark | SM |
| Birds eye | BE |
| Wrong direction | WD |
| Pin holes | PH |
| Barre mark | BM |
2.The chemical should have concentration with a higher degree of purity.
3.The entire machine should have high precision.
Process control: The specific gravity, water level, residual hydrogen per oxide at each stage should be checked.
Offline quality control is a system which reduces the faults or stop the process and takes necessary steps to recover it during manufacturing.
