Statistical Quality Control in Apparel Industry

Last Updated on 03/01/2021

Statistical Quality Control in Apparel Industry

R.S. Balakumar
Associate Professor,
Dept of Fashion Design & Arts,
Hindustan University, Chennai, India


Statistical quality control:
Diagrammatic representation like histogram, circle diagram, pare to chart, scatter diagram, showing the defective status of the garment produced in the mass production section is called statistical quality control (SQC).

Quality controllers must have a thorough knowledge of this SQC.

Managing quality through inspection:
In the begging to obtain an overall picture of where you stand in terms of quality, perform 100%. Final inspection of all style for at least two or three weeks and collects information. The following variation defects to look for:

  1. Broken button
  2. Broken snaps
  3. Broken stitching
  4. Defective snaps
  5. Different shades within the same garment
  6. Dropped stitches
  7. Exposed notches
  8. Exposed raw edges
  9. Fabric defects
  10. Holes
  11. Inoperative zippers
  12. Loose/hanging sewing threads
  13. Misaligned buttons and button holes
  14. Missing buttons
  15. Needle cuts/chews
  16. Open seams
  17. Pulled/loose yarns
  18. Stain
  19. Unfinished button holes
  20. Zipper too short

The preceding list of defects is by number means exhaustive. It is only an example. Like this model format quality controllers must able to prepare the list as shown below.

Final inspection report
Fig: Final inspection of style XYZ

A histogram is a bar chart or a bar graph. It is a graphical depiction of a number of occurrences of an event. Histogram simply shows the distribution of sample data and give some idea about variability or that data. Histogram is a graphic summary of variation in a set of data, and is a simple but most powerful tool for elementary analysis. A histogram can help understand the total variation or a process, and quickly and easily determine the under-laying distribution or a process.

Fig: Histogram

Pareto chart:
A pareto chart is nothing but a histogram where a number of occurrences of an event or arranged in descending order. Thus, pareto chart helps to identify those effects that causes most problem can be solved and improvement be made.

For example, of the 208 defect shown in the pareto chart, 45 or 21.6% are fabric defects so in this instance, it would be most effective to address fabric quality first because any improvement in the fabric quality will significantly improve overall quality of the product the next defect to address should be open seams, and so forth.

Managing Quality in the Apparel Industry -by Pradip. V. Mehta & Satish. K.Bhardwaj

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