4 Point Inspection System | Texhour.com
Factors such as the type of weave, yarn used, finishing treatment, the mechanical condition of the machines and weavers’ practices influence the fabric quality. The FOUR POINT inspection system is the established method of fabric inspection globally and is based on penalty points given to a defect found when inspecting fabric
4 Point Inspection System
• Factors such as the type of weave, yarn used, finishing treatment, the mechanical condition of the machines and weavers’ practices influence the fabric quality.
• The four-point inspection system is the established method of fabric inspection globally and is based on penalty points given to a defect found when inspecting fabric.
The Four Point Inspection Rules:
• Not more than four penalty points are given for any single defect.
• No more than four penalty points are given to one linear yard regardless of the number of defects found within that one meter.
• For continuous defects such as side to side shading or end to end shading, no penalty points are assigned and the entire roll is rejected.
The Process of Four Point Inspection System:
• Pass the fabric longitudinally through the Inspection machine at a speed not exceeding 15 meters /min
• The light source should be perpendicular to the surface of the fabric and the fabric should run at an angle of 45 – 60 degrees to the vertical
• The inspection area surface illumination level should be a minimum of 1075 lux. The lighting source should be cool white fluorescent (CWF) lamps having a correlated color temperature of 4100 to 4500K with white reflectors
• Inspect the fabric from a distance of one metre.
• Assign defect points based on the length of the defect:
|Defect length (inches)||Points to be assigned|
Up to 3
3 to 6
6 to 9
• Assign four points to each meter of fabric where the usable width is less than the minimum specified.
• No running yard of the fabric shall be penalized more than four points
• Defects not visible on the face of the fabric shall not be counted
• 40 points per 100 square yards (or 47.5 points per 100 sq meter) is considered an acceptable defect rate by fabric industry.
But the garment industry is not usually in agreement.
The width of fabric: 100 cm
Total fabric received: 4500metres
Acceptance Point-count: 40 per 100sq yards (= 47.5 points/100 sq mt)
Total fabric Inspected : 450 metres = 450X100/100sq mt = 450 sq mt
Total penalty points found in the sample inspection: 194 points
Therefore penalty points per 100 sq mt = 194/450X100 = 43.11
which is within the tolerance of 47.5persq mt.points
This shipment is therefore acceptable.