Four Point Systems For Knit Fabric Quality Measurement

In knit fabric inspection system; most of the companies follow four point systems for measuring the quality of the knit fabric. There are various methods for measuring quality of the knit fabric but among all of the methods four point systems is preferable to the inspector of the quality.

After knitting; knitted fabrics are gathered in front of the checking table and the quality inspector inspect the quality of the knit fabric and listed the faults found in the knit fabric and mark it in the knit fabric.

Most of the knit fabric manufacturing companies maintain the ISO: 9001:2000 standards in case of quality. Therefore, the four point systems are followed to inspect the body & rib fabric. The defects found and points given against are recorded in the inspection sheet. Following table shows the four point grading system followed by inspection at different knitting mills.

Four (4) – Point system for knitting fault inspection:

During inspection, if the inspector found any knitting faults then he marks it in the fabric and counts it in the sheet. During inspection, following points are considered.

Knitting fault Point
Slub 1
Any hole 4
Needle/Sinker line 4
Needle breakage(up to 10) 4
Press off 4
Thick, Thin, Dirt, Oil spot, Contamination up to 3″ in length 1
Thick, Thin, Dirt, Oil spot, Contamination up to 6″ in length 2
Thick, Thin, Dirt, Oil spot, Contamination up to 9″ in length 3
Thick, Thin, Dirt, Oil spot, Contamination above 9″ in length 4

Quality (points per 100 square meter) = (Total point X GSM)/ (Roll weightX10)

Quality Classification: After calculation of the quality of the knit fabrics, decision is delivered according to the following way.

1 2 3
<20 20 – 30 >30
OK Ask Reject

So, when we will check the quality of the knit fabric, we should follow the four point systems.