Common Manufacturing Defects: Identification and Prevention

#Introduction

Zero defects is a myth. Every production run has variations. The goal of Quality Control is not perfection, but controlled imperfection.

Understanding defect types is critical for setting your Acceptable Quality Limit (AQL) and avoiding disputes with suppliers.

#Defect Classifications

Inspectors categorize defects into three severities:

#1. Critical Defects

Definition: Hazardous to the user or violates regulations. Tolerance: 0. Examples: Sharp edges on a toy, mold, live electrical wires.

#2. Major Defects

Definition: Affects functionality or saleability. Customer would return it. Tolerance: Typically 2.5%. Examples: Logo printed crooked, zipper stuck, wrong size.

#3. Minor Defects

Definition: Cosmetic flaw that doesn't affect function. Customer might not notice. Tolerance: Typically 4.0%. Examples: Small scratch, untrimmed thread, slight color deviation.

#Prevention Strategies

You can't inspect quality into a product. You must build it in.

#Common Defects by Industry

#Injection Molding (Plastics)

• Flash: Excess plastic on edges.
• Sink Marks: Depressions in surface.
• Short Shot: Incomplete shape.

#Soft Goods (Textiles)

• Skipped Stitches: Weak seam.
• Color Shading: Variance between dye lots.
• Puckering: Uneven fabric near seams.

#How to Handle Defective Goods

If an inspection fails:

1. Don't Ship: Do not authorize shipment.
2. Ask for Rework: Factory must repair defects.
3. Re-inspect: You pay for re-inspection (put this in contract).
4. Destroy: If Critical defects, destroy goods to protect brand.

#Ready to Reduce Defects?

Defects are expensive. Inspections are cheap.

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Related Resources:

• Defect Classification List
• AQL Calculator