Boorim Textile SolutionsFabric defects are problems that affect appearance, performance, cutting, sewing, conversion, or final product quality. Some defects are visible immediately. Others appear only after washing, stretching, coating, lamination, or use.
Identifying defects correctly helps buyers and suppliers decide whether fabric can be accepted, sorted, repaired, downgraded, or rejected.
Knowledge pill: A fabric defect is not just a mark on the surface. It is any condition that makes the fabric different from the agreed standard or unsuitable for the intended use.
Yarn and fibre defects
Yarn defects often appear as irregular lines, lumps, thin areas, or weak spots.
| Defect | How it appears |
|---|---|
| Slub | Thick lump or uneven yarn section |
| Neps | Small tangled fibre clusters |
| Contamination | Foreign fibre, dark fibre, plastic, hair, or dirt |
| Weak yarn | Breakage, holes, or poor strength during processing |
| Uneven yarn | Streaks, barre, or irregular fabric surface |
Some yarn irregularity may be intentional, such as slub yarn. The issue is whether it matches the approved design.
Woven fabric defects
Woven defects often come from warp, weft, loom setting, tension, or yarn problems.
Common woven defects include:
- Broken warp ends
- Missing or double weft picks
- Reed marks
- Floats
- Tight or slack ends
- Width variation
- Bowing or skew
- Selvedge damage
- Streaks or barriness
These defects may affect appearance, strength, coating uniformity, cutting accuracy, or final product performance.
Knitted fabric defects
Knitted fabric defects often relate to loop formation, needle condition, yarn feed, tension, or finishing.
Common knitted defects include:
- Dropped stitches
- Needle lines
- Holes
- Snags or pulled loops
- Spirality
- Edge curling
- Barre
- Uneven stitch length
- Poor stretch recovery
Some knit defects become more visible after washing or garment sewing.
Dyeing and colour defects
Colour defects can be difficult because they depend on light, standard sample, viewing angle, and lot separation.
| Defect | What to check |
|---|---|
| Shade variation | Roll-to-roll, side-to-side, or within-roll colour difference |
| Streaks | Long colour lines in machine direction |
| Barre | Repeating horizontal or vertical shade bands |
| Uneven dyeing | Cloudy or patchy colour |
| Staining | Unwanted colour transfer or spots |
| Poor colour fastness | Colour loss or transfer during washing, rubbing, light, or water exposure |
Always compare against the approved colour standard under the agreed light source.
Finishing defects
Finishing changes the final fabric touch, stability, surface, and performance. Defects can appear when heat, pressure, chemical, mechanical action, or washing is not controlled.
Common finishing defects include:
- Creases or permanent fold marks
- Uneven brushing or peaching
- Harsh or inconsistent hand feel
- Excessive shrinkage
- Skew or bow
- Pilling or surface fuzz
- Gloss variation
- Yellowing or discoloration
Finishing defects may affect both appearance and usability.
Coating and lamination defects
Coated and laminated fabrics need special inspection because layer bonding and surface uniformity matter.
Check for:
- Bubbles
- Delamination
- Adhesive strike-through
- Coating streaks
- Pinholes
- Uneven coating weight
- Cracking
- Poor peel strength
- Blocking, where layers stick together on the roll
For functional fabrics, a clean surface is not enough. Waterproofness, breathability, peel strength, or barrier performance may also need testing.
Handling and packing defects
Some defects happen after production.
Examples:
- Dirt or oil marks
- Moisture damage
- Roll crushing
- Edge damage
- Poor winding
- Creases from tight packing
- Incorrect labeling
- Mixed lots
Packing defects are especially frustrating because they can damage otherwise good fabric.
How to identify defects during inspection
Use a systematic method:
- Compare fabric against the approved standard.
- Inspect under consistent lighting.
- Mark defect location and size.
- Record roll number and lot number.
- Separate major defects from minor defects.
- Check whether defects repeat.
- Decide whether sorting, repair, replacement, or rejection is needed.
Repeated defects often point to machine, yarn, dyeing, or finishing problems.
Fast recall
Common fabric defects include yarn irregularities, broken yarns, holes, stains, shade variation, streaks, barre, dropped stitches, bowing, skew, shrinkage, pilling, coating defects, lamination defects, and packing damage. Identify defects by comparing them with the approved standard and recording where, how often, and how severely they appear.