A roll of polyester knitted fabric can lie relatively flat while it is still intact.
But once the fabric is cut into garment panels, the edges may suddenly begin to roll or curl.
The sides may turn inward.
The top or bottom edge may roll toward one surface.
A flat rectangular panel can quickly become difficult to handle on the cutting table or sewing line.
This phenomenon is known as edge curling.
Edge curling is especially common in certain knitted structures such as single jersey because the fabric contains an inherent imbalance between the geometry of the face and back loops.
Residual stresses introduced during:
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Knitting.
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Dyeing.
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Heat setting.
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Width stretching.
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Drying.
can further influence how strongly the cut edge curls.
Edge curling is not necessarily a sign that the polyester yarn itself is defective.
It is often a structural property of the knit.
However, excessive curling can create serious garment-production problems.
It can lead to:
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Difficult panel alignment.
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Uneven seam allowances.
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Sewing distortion.
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Slower production.
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Fabric handling problems.
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Incorrect measurements.
This article explains why polyester knitted fabric curls after cutting, why single jersey is particularly susceptible, how residual stress and heat setting affect the defect, and what mills and garment manufacturers can do to reduce it.
1. What Is Edge Curling?
Edge curling is the tendency of a cut knitted fabric edge to roll away from a flat condition.
Depending on the knit structure, curling may occur:
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Along the wale direction.
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Along the course direction.
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Toward the face.
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Toward the back.
The degree of curling can range from slight rolling to severe coiling.
2. Why Does Curling Often Appear Only After Cutting?
Before cutting, the surrounding fabric structure helps restrain the loops.
Once the edge is cut, that restraint disappears.
The edge loops are then free to relax.
If the structure contains unbalanced internal forces, the edge moves until a lower-energy configuration is reached.
That movement appears as curling.
3. Why Is Single Jersey Especially Prone?
Single jersey is structurally asymmetric.
Its technical face and technical back are different.
This creates an imbalance in loop forces.
As soon as the edge is released, the loops tend to rotate or bend.
That is why single jersey commonly curls more than balanced double-knit constructions.
4. Which Direction Does Single Jersey Curl?
The direction depends on which edge is cut.
In general, single jersey has characteristic curling tendencies because of its asymmetric loop geometry.
One pair of edges may curl toward the face while the other pair may curl toward the back.
The exact appearance depends on yarn, finishing and tension.
5. Is Edge Curling the Same as Fabric Spirality?
No.
Spirality refers to angular distortion of knitted courses and wales, often causing garment side seams to twist after washing.
Edge curling is local rolling at a free cut edge.
Both may be influenced by residual stress, but they are different defects.
6. Is Edge Curling the Same as Shrinkage?
No.
Shrinkage is dimensional reduction after relaxation, washing or thermal treatment.
Curling is a shape change at the edge.
A fabric can curl strongly without showing major overall shrinkage.
7. Why Does Knit Structure Matter More Than GSM?
GSM measures fabric mass.
It does not directly describe loop symmetry.
A 180 GSM single jersey may curl more than a 150 GSM interlock.
Therefore, heavier fabric does not automatically mean better edge stability.
8. Why Does Interlock Usually Curl Less?
Interlock is a more balanced double-knit structure.
Its two surfaces are structurally more symmetrical.
Opposing loop forces can partially balance each other.
This generally improves edge stability.
However, finishing conditions can still create some distortion.
9. Can Rib Fabric Curl?
Rib is also more balanced than single jersey.
Because face and back loops alternate, the tendency to curl can be lower.
But rib can still distort depending on:
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Yarn torque.
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Stretch.
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Finishing.
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Cutting direction.
10. Can Piqué Curl After Cutting?
Yes.
Piqué has a more complex texture and loop arrangement.
Its curling tendency depends on:
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Construction.
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Yarn count.
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Stitch density.
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Surface structure.
Some piqué fabrics are relatively stable, while others may roll noticeably.
11. Can Mesh Fabric Curl?
Yes.
Open mesh fabrics can curl, especially if the structure is asymmetric or highly tensioned.
However, large openings may create a different type of edge instability compared with compact jersey.
12. What Is Residual Stress in Knitted Fabric?
Residual stress is internal mechanical tension that remains in the fabric after processing.
It may be introduced during:
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Knitting.
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Dyeing.
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Stentering.
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Heat setting.
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Rolling.
When the fabric is later cut, washed or relaxed, these stored stresses can be released.
13. How Does Knitting Tension Affect Curling?
High or uneven yarn tension can alter loop geometry.
If loops are formed under excessive tension, they may try to relax after cutting.
This can increase edge movement.
Consistent knitting tension is therefore important.
14. Can Yarn Torque Increase Curling?
Yes.
Textured or twisted yarn may contain residual torque.
If that torque is not sufficiently balanced, the yarn may try to rotate after relaxation.
This can amplify curling and fabric distortion.
15. Does DTY Affect Edge Curling?
DTY contains crimp and textured structure.
Its residual torque, crimp development and relaxation behaviour can influence edge stability.
However, DTY itself is not automatically the cause.
The effect depends on the complete fabric construction.
16. Can FDY Fabric Curl Too?
Yes.
Even smooth filament yarn can produce curling if knitted into an asymmetric structure such as single jersey.
Yarn type influences the severity, but the knit structure remains the main factor.
17. Does Filament Count Matter?
Indirectly.
Filament count affects:
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Yarn flexibility.
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Surface friction.
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Loop movement.
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Fabric hand.
A very soft high-filament yarn may allow greater loop mobility.
However, filament count alone cannot predict edge curling.
18. How Does Loop Length Affect Curling?
Longer loops generally create a more open and flexible structure.
This may allow the edge to move more freely.
Shorter loops create a more compact structure.
However, excessively tight loops can store more stress.
Therefore, the relationship is not simply “shorter loop = less curling.”
19. Can Stitch Density Affect Curling?
Yes.
Stitch density influences:
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Fabric compactness.
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Loop mobility.
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Residual stress distribution.
Two fabrics with the same GSM but different stitch density can behave very differently after cutting.
20. How Does Heat Setting Affect Edge Curling?
Heat setting is one of the most important finishing processes for polyester.
Under controlled heat and tension, polyester loops can be stabilized.
Proper heat setting can reduce:
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Residual stress.
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Dimensional instability.
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Excessive curling.
But heat setting does not completely remove the inherent structural imbalance of single jersey.
21. Can Poor Heat Setting Make Curling Worse?
Yes.
If the fabric is not stabilized adequately, more residual stress remains.
After cutting, the edge may relax more aggressively.
Possible signs include:
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Strong rolling.
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Width distortion.
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Uneven panel shape.
22. Can Over-Stretching During Stentering Increase Curling?
Yes.
If fabric is stretched too wide during finishing, loop geometry can become distorted.
When the fabric is later cut, the edge may try to recover toward a more relaxed state.
This can increase curling.
23. Does Overfeed Matter?
Yes.
Overfeed influences longitudinal relaxation during finishing.
Incorrect overfeed can leave fabric under residual tension.
This may affect both:
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Shrinkage.
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Edge behaviour.
The correct setting depends on the fabric construction.
24. Can Heat Setting Remove Curling Completely?
Usually not for strongly asymmetric structures.
It can reduce the severity by stabilizing loops and residual stress.
But the underlying loop imbalance still exists.
Therefore, some single jersey fabrics naturally retain a tendency to curl.
25. Can Chemical Finishing Reduce Curling?
Certain finishes may change:
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Surface friction.
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Stiffness.
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Loop mobility.
A slightly firmer finish may temporarily improve edge handling.
However, chemical finishing should not be used as the only solution for a fundamentally unstable construction.
26. Can Silicone Softener Increase Curling?
Potentially.
A very lubricating finish may increase yarn mobility.
This can allow loops to relax more freely after cutting.
However, the effect varies by fabric and softener type.
27. Can Resin Finishing Reduce Curling?
Some resin or stabilizing treatments may increase fabric stiffness and temporarily reduce edge rolling.
But excessive resin can negatively affect:
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Hand feel.
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Stretch.
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Breathability.
The trade-off should be evaluated.
28. Why Does Edge Curling Cause Cutting Problems?
Curled edges make it difficult to:
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Align panels.
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Measure accurately.
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Maintain seam allowance.
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Stack layers.
This can slow down cutting and reduce precision.
29. Why Does It Cause Sewing Problems?
During sewing, a curled edge may roll under the presser foot.
This can cause:
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Uneven seams.
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Double-folded edges.
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Skipped stitches.
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Poor alignment.
Operators may need to flatten the fabric manually, reducing productivity.
30. Can Curling Affect Automated Cutting?
Yes.
Automated cutting systems depend on flat material.
Severe edge curling can interfere with:
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Vacuum hold-down.
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Pattern accuracy.
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Layer alignment.
This makes edge stability especially important in automated garment factories.
31. Can Relaxing the Fabric Before Cutting Help?
Yes.
Allowing fabric to relax can reduce residual tension before cutting.
The exact relaxation period depends on:
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Fabric type.
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Roll tension.
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Storage condition.
Relaxation helps the fabric reach a more stable state before garment panels are cut.
32. Can Spreading Method Affect Curling?
Yes.
If the fabric is stretched during spreading, it may recover after cutting.
Good spreading practice should avoid excessive tension.
The objective is to lay the fabric flat without pulling it.
33. Can Using Weights or Vacuum Help?
Yes.
During cutting, temporary restraints such as:
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Weights.
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Vacuum tables.
can keep curled edges flat.
These methods help production but do not change the underlying fabric structure.
34. Can Edge Adhesive or Temporary Stabilizer Help?
In some garment operations, temporary stabilizing methods may be used.
However, any chemical or adhesive must be compatible with:
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Sewing.
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Washing.
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Final garment appearance.
This is a production workaround rather than a fabric-level solution.
35. What Should Mills Do to Reduce Curling?
Key controls include:
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Consistent knitting tension.
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Appropriate loop length.
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Balanced yarn selection.
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Controlled relaxation.
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Proper heat setting.
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Avoid excessive width stretching.
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Consistent finishing.
36. What Should Garment Factories Do?
Before bulk cutting:
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Relax the fabric.
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Check curl direction.
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Test representative panels.
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Avoid excessive spreading tension.
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Use suitable cutting restraints.
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Adjust sewing handling.
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Confirm seam allowance.
37. Common Misconceptions About Edge Curling
Misconception 1: Edge Curling Means the Fabric Is Defective
False.
Some knit structures naturally curl.
Misconception 2: Higher GSM Always Prevents Curling
False.
Structure matters more than weight alone.
Misconception 3: Heat Setting Eliminates Curling Completely
False.
It can reduce but not always remove the structural tendency.
Misconception 4: Only Cotton Jersey Curls
False.
Polyester single jersey can also curl.
Misconception 5: Curling Is the Same as Spirality
False.
They are different structural behaviours.
Misconception 6: Softener Always Improves Edge Stability
False.
Highly lubricating finishes may sometimes increase yarn mobility.
38. Frequently Asked Questions
Why does polyester single jersey curl after cutting?
Because its face and back loop structures are asymmetric, creating unbalanced internal forces.
Can heat setting reduce curling?
Yes.
Does GSM control edge curling?
No.
Why does interlock curl less?
Because its structure is more balanced.
Can yarn torque make curling worse?
Yes.
Can over-stentering increase curling?
Yes, by storing residual tension.
Should fabric be relaxed before cutting?
Yes.
Is edge curling always a quality defect?
No. The acceptable level depends on construction and end use.
39. Why Should Bulk Buyers Care?
A fabric can meet:
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GSM.
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DIA.
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Shade.
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Strength.
and still be difficult to cut and sew because of excessive edge curling.
This affects garment-production efficiency.
Therefore, fabric suitability should be evaluated not only as a finished roll but also after:
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Relaxation.
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Cutting.
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Sewing.
40. Final Takeaway
Polyester fabric edge curling is primarily a structural and stress-relaxation phenomenon.
It occurs when cut edges are freed from the restraint of the surrounding fabric.
In asymmetric knit structures—especially single jersey—the loops naturally try to rebalance themselves.
Residual stress from:
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Knitting.
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Width stretching.
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Heat setting.
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Rolling.
can make the effect stronger.
For textile mills, the most effective controls are stable knitting and careful finishing.
For garment factories, fabric relaxation and low-tension spreading can reduce production problems.
For bulk buyers, the key lesson is:
A fabric can look perfectly flat on the roll and still become difficult to handle the moment it is cut.
Edge stability should therefore be considered when selecting polyester fabric for high-volume garment production.
At Walrus – Yes India Can, we supply polyester knitted fabrics for sportswear, T-shirts, polos, uniforms, activewear and garment manufacturing.
Explore our polyester fabric collections and contact our team for bulk sourcing requirements.
Website: https://www.yesindiacan.in/
Contact: +91 90420 77722
