Defects in Woven Fabrics: Identification, Causes and Prevention Methods

Woven fabrics are widely used in garments and textiles, but they are prone to some defects during production. These defects may be due to fault of machine, quality of yarn or wrong handling. To improve the quality of the fabric and reduce the rejection rate, it is necessary to know the causes, effects, and preventive measures. Below are detailed explanations of some of the common defects found in woven fabric.

Major Woven Fabric Defects

Bad Selvage

The edge of the fabric is known as the selvage and when it is defective it can cause serious difficulties in the manufacture of garments. A bad selvage can look frayed, curled, or uneven, and sometimes the edge yarns are either too loose or too tight.

This is mostly due to incorrect selvage motion, wrong weft tension or problems with the tuck-in device. The problem can also be caused by broken or weak edge warp yarns.

The consequences are serious – cutting is difficult, edges may tear when spreading, and garment panels may be rejected outright.

To avoid this manufacturers must ensure correct selvage setting, correct weft insertion control and regular inspection of tuck in mechanisms.
Bad selvage appears as:

• Frayed edges
• Loose or tight edge yarns
• Wavy, curled or torn edges

Causes

• Incorrect selvage motion
• Improper weft tension
• Faulty tuck‑in device
• Broken or weak edge warp yarns

Effects

• Cutting difficulties
• Edge tearing during spreading
• Garment panel rejection

Prevention

• Correct selvage setting
• Proper weft insertion control
• Regular inspection of tuck‑in mechanisms

Broken Warp or Weft

A broken warp or weft shows as a thin line across the fabric and is caused by missing or broken yarns. This defect is more pronounced, usually visible after dyeing.

The main reasons are bad yarn quality, tension, sharp parts of the loom and weak yarn strength.

The adverse effects are loss of strength of the fabric, visible lines after finishing and increased tearing propensity during wear of the garment.

Prevention is to use yarns of sufficient tensile strength, to set the right tension and to timely replace the damaged parts of the loom.

Causes

• Weak yarn strength
• Excessive tension
• Sharp loom parts
• Poor yarn quality

Effects

• Reduced fabric strength
• Visible lines after dyeing
• Risk of fabric tearing

Prevention

• Use yarn with adequate tensile strength
• Optimize warp and weft tension
• Replace damaged loom components

Loose Warp (Slack Warp)

Loose warp yarns appear wavy or buckled with respect to the neighboring yarns, leading to a distorted appearance of the fabric.

This defect is often caused by uneven warp tension, improper let-off mechanisms or defects in the warp beam.

The result is obvious: fabric distortion, color change after dyeing, bad look of the garment.

To prevent this manufacturers must maintain consistent warp tension, regularly align beams and properly adjust let-off mechanisms.

Causes

• Unequal warp tension
• Incorrect let‑off mechanism
• Warp beam defects

Effects

• Fabric distortion
• Shade variation after dyeing
• Poor garment appearance

Prevention

• Uniform warp tension
• Regular beam alignment
• Proper let‑off adjustment

Hole

One of the most critical defects is a hole. A hole is an open space in the fabric due to missing or broken yarns.

It can be caused by broken warp or weft yarns that are not repaired, mechanical damage or weak yarn breakage.

Unfortunately, holes are often a reason for fabric rejection as they are not repairable in most cases.

Prevention is immediate stoppage of loom when yarn breaks, effective warp stop motions and strict inspection routines.

Causes

• Broken warp and weft not repaired
• Mechanical damage
• Weak yarn or slub breakage

Effects

• Fabric rejection
• Not repairable in most cases
• Severe quality fault

Prevention

• Immediate loom stop on yarn break
• Effective warp stop motion
• Strict fabric inspection

Miss Pick

A miss pick occurs when one or more weft yarns are not inserted in the fabric. This leaves thin horizontal gaps that are very visible, especially when you've finished or dyed your hair. These gaps are even more noticeable in solid-dyed fabrics, and the defect is unacceptable to most buyers.

The root causes are often weft breakage, malfunction of shuttle, rapier or air‑jet systems and improper pick detection. If the loom does not stop immediately after a missed insertion, the defect continues along the fabric length.

The consequences are serious: the material is structurally less stable and the defect is visible to the naked eye. Clothes made of such fabric may tear easily or be rejected at inspection.

To avoid miss picks weft stop motions should be properly fitted, insertion systems need to be checked regularly and calibration checks should be done to ensure smooth operation of the looms.

Causes

• Weft breakage
• Shuttle/rapier/air‑jet malfunction
• Improper pick detection

Effects

• Fabric weakness
• Visual defect after finishing
• Rejection in solid‑dyed fabrics

Prevention

• Proper weft stop motion
• Maintain weft insertion systems
• Regular loom calibration

Loose Weft (Slough‑off)

Loose weft yarns appear slack, causing loops or waviness across the fabric. It breaks the uniform surface of the fabric and can cause problems in cutting and sewing.

The main causes are: low weft tension, wrong beat-up force, or faulty take-up motion. If the weft yarn is not held firmly in place it will not integrate properly with the warp yarns and will result in unevenness.

The effects are visible: inconsistent dyeing, uneven fabric surfaces and a loss of professional finish in garments. The loops can get caught when handling the extreme cases, causing further damage.

Prevention involves adjusting the weft tension properly, optimizing the beat-up force, and inspecting the take-up mechanism regularly to make sure that fabric winding is smooth.

Causes

• Low weft tension
• Improper beat‑up force
• Faulty take‑up motion

Effects

• Uneven fabric surface
• Poor dyeing uniformity
• Cutting and sewing problems

Prevention

• Correct weft tension setting
• Optimize beat‑up force
• Regular take‑up checks

Ball (Knot / Lint Ball)

Lint balls or knots are small accumulations of fibers caught in the fabric structure. They may look like nothing at first but once dyed they are visible spots that spoil the look of the fabric.

These defects are often caused by yarn knots, lint contamination in the weaving area or poor yarn clearing during preparation. This problem is more common in factories with bad house keeping.

The consequences are poor aesthetic appeal, customer complaints and rejection of fabric lots . Buyers can see lint balls as a sign of bad quality control.

To avoid this yarn clearers should be used, housekeeping has to be improved to reduce lint contamination and knot frequency has to be minimized during yarn preparation.

Causes

• Yarn knots
• Fly and lint contamination
• Poor yarn clearing

Effects

• Visible spots after dyeing
• Poor aesthetic appearance
• Buyer complaints

Prevention

• Use yarn clearers
• Improve housekeeping
• Reduce knot frequency

Reed Mark

Reed marks are vertical streaks or lines that repeat at regular intervals, corresponding to the reed's dent. They are among the most common appearance flaws encountered in woven fabrics.

Causes include damaged or dirty reeds, uneven spacing of warp yarns, or selection of the wrong reed count. The reed does not beat the warp yarns evenly, leaving the yarns unevenly spaced, and thus the streaks are visible.

The effects are considerable. After dyeing, barre or streaks develop and the overall appearance of the fabric is impaired. Once they happen, these defects are hard to fix, so prevention is key.

Regular reed cleaning, proper reed selection, and uniform warp drawing‑in are necessary to avoid reed marks.

Causes

• Damaged or dirty reed
• Unequal spacing of warp yarns
• Incorrect reed count

Effects

• Barre or streaks after dyeing
• Fabric appearance defects
• Difficult to correct later

Prevention

• Regular reed cleaning
• Correct reed selection
• Uniform warp drawing‑in

Float

A float is when a yarn passes over a number of yarns without being properly interlaced. This results in loose sections that snag and wear easily.

Floats are caused by an incorrect weave design, broken yarns that miss interlacing, or loom timing faults. Floats can run across large portions of fabric if not corrected immediately.

reduced abrasion resistance, visible defects in finished garments, and snagging during use. Fabrics with floats are often rejected because of durability problems.

To avoid this proper programming of the weave, immediate repair of broken ends and proper control of the timing of the loom is necessary to ensure that the yarns interlace correctly.

Causes

• Incorrect weave design
• Missing interlacing due to broken yarn
• Loom timing faults

Effects

• Snagging during use
• Reduced abrasion resistance
• Visible defects in finished garments

Prevention

• Correct weave programming
• Immediate repair of broken ends
• Proper loom timing control

Slub (Unwanted)

Slubs are thick areas of yarn that appear as bumps or lines in the fabric. Although intentional slubs are sometimes used for fashion effects, unwanted slubs are defects.

They are caused by yarn count variation, poor carding or combing in spinning or roller slippage. When the thickness of the yarn varies, the fabric surface is uneven.

The effects are uneven appearance, dyeing spots and reduced strength of the fabric. Slubs can make garments look cheap or poorly made, leading to dissatisfaction among buyers.

Prevention means rigorous yarn evenness control, use of autolevellers in spinning and optimization of yarn clearers to identify and clear thick places before weaving.

Causes

• Yarn count variation
• Poor carding/combing
• Roller slippage in spinning

Effects

• Uneven appearance
• Dyeing spots
• Reduced fabric strength

Prevention

• Yarn evenness control
• Autoleveller use
• Yarn clearer optimization

Double Pick

A double pick means that two weft yarns are inserted at the same time instead of one. This creates a heavy horizontal line on the cloth, which is especially visible after dyeing. The defect is very noticeable in solid-dyed fabrics and often results in rejection.

The double picks are generally due to faulty weft insertion systems, timing problems in rapier or air-jet looms or incorrect control of weft. If the loom timing is wrong or the insertion mechanism is not working correctly, two yarns may lie side by side instead of one.

And the effects aren’t just visual. Double picks can lead to shade variation after dyeing, uneven fabric thickness and problems in garment cutting. Many buyers consider this defect as major because it affects the performance and also the look.

The prevention depends on the careful maintenance of weft insertion systems, regular checking of loom timing and effective pick detection mechanisms. Manufacturers can cut down on the occurrence of double picks by making sure that each insertion is promptly checked and corrected.

Causes

• Faulty weft insertion
• Timing issues in rapier or air‑jet looms
• Improper weft control

Effects

• Thick horizontal line
• Shade variation after dyeing
• Fabric rejection in solid shades

Prevention

• Maintain weft insertion system
• Check loom timing
• Effective pick detection

Snag

A snag is a defect, which occurs when yarn loops are pulled out of the fabric structure. This happens generally as a result of mechanical pulling, abrasion or rough handling during production and transit. Snags are easy to see because they break the smooth surface of the fabric with visible loops or pulled threads.

Sharp edges of machines, improper fabric transport or careless handling during storage can cause it. Small abrasions can cause weak areas in the fabric, which then become snags.

The consequences are serious, as clothes made of snagged fabric are not only unattractive, but also have weak points that reduce durability and often lead to customer dissatisfaction. Sometimes snags are considered minor defects, but if they are frequent or large, they can result in fabric rejection.

Prevention includes handling material smoothly, polishing machine surfaces to remove sharp edges and storing and transporting fabrics carefully. A clean and safe production environment helps manufacturers to reduce snagging and protect the quality of fabric.

Causes

• Rough handling
• Sharp edges on machines
• Improper fabric transport

Effects

• Poor appearance
• Weak points in fabric
• Customer dissatisfaction

Prevention

• Smooth material handling
• Machine surface polishing
• Careful fabric storage and transport

Severity Classification (Typical)

(Severity depends on buyer standard and defect size/frequency.)

Impact of Woven Fabric Defects on Garments

Cutting Wastage Increases:

Sewing interruptions

Visible garment defects

Higher rejection and claims

Reduced brand value

Final thought

Woven fabric defects are not only technical problems on the loom, but problems that cascade through all stages of garment production. Each defect has a cost that goes much further than the fabric itself, from cutting losses and sewing interruptions to visible flaws and damage to brand reputation. A slight irregularity in the yarn tension or loom timing can begin as a little problem but ultimately decide whether a garment will meet the buyer’s expectations or be rejected.

This is why textile manufacturing has quality control and inspection at its back bone. By looking at grey fabric early, monitoring looms in real time, using standardized systems such as the 4-Point method, and auditing fabric before cutting, manufacturers put a safety net in place that protects both their operation and their clients. They are not just practices — they are investments in trust, efficiency and long-term brand value.

In the final analysis, woven fabric defects can never be eliminated entirely, but their effect can be minimized through vigilance, precautions and disciplined inspection. A factory that considers quality control as a culture instead of a checklist will not only reduce rejections but also improve its reputation in the global market. After all, quality is the silent ambassador of every garment.