A roll of polyester knitted fabric may look perfectly stable when it arrives at a garment factory.
But once the fabric is unrolled, its width, length and surface tension can begin to change.
This happens because knitted fabric may carry tension from:
-
Knitting
-
Dyeing
-
Finishing
-
Rolling
-
Packing
-
Transportation
Before bulk cutting, many knitted fabrics therefore need time to settle into a more stable condition.
This process is known as fabric relaxation.
For garment manufacturers, clothing brands, uniform suppliers and sportswear producers, understanding fabric relaxation can help improve cutting accuracy and finished garment consistency.
What Is Fabric Relaxation?
Fabric relaxation is the process of allowing fabric to rest after it has been removed from the roll or opened from its packed condition.
During this period, mechanical tension stored inside the fabric can gradually reduce.
The fabric may experience small changes in:
-
Width
-
Length
-
Shape
-
Surface flatness
-
GSM
-
Curling
-
Dimensional stability
The objective is to cut the fabric after it has reached a more stable condition rather than while it is still under unnecessary roll or processing tension.
Why Does Knitted Fabric Carry Tension?
Polyester knitted fabric passes through several production stages before reaching a garment factory.
These can include:
Knitting → Dyeing → Finishing → Heat Setting → Rolling → Packing → Transport
During these processes, the fabric may be:
-
Stretched
-
Pulled
-
Compressed
-
Heated
-
Rolled tightly
-
Held under machine tension
Some of this tension can remain inside the fabric.
When the roll is opened, the knitted loops can begin adjusting toward a more natural state.
That is why freshly unrolled fabric may not immediately represent its final usable dimensions.
Simple Example
Suppose a fabric roll is measured immediately after opening.
The width appears to be:
60 inches
After sufficient relaxation, the fabric settles to:
59 inches
A one-inch difference may appear small.
But across hundreds or thousands of garment panels, it can affect:
-
Marker planning
-
Fabric consumption
-
Cutting yield
-
Garment measurements
This is why actual usable width should be confirmed under appropriate production conditions.
Why Polyester Knitted Fabric Needs Attention
Polyester fibre itself generally has good dimensional stability.
However, the behaviour of a finished knitted fabric depends on more than the fibre alone.
It can also depend on:
-
Knit construction
-
Yarn type
-
Loop density
-
Machine tension
-
GSM
-
Finishing
-
Heat setting
-
Elastane content
-
Fabric width
-
Rolling tension
A polyester knit can therefore still change dimensions after being unrolled or processed.
What Happens If Fabric Is Cut Without Relaxation?
Cutting fabric too early can create several production problems.
Incorrect Garment Measurements
If fabric contracts after cutting, garment panels may become smaller than expected.
This can affect:
-
Chest measurement
-
Body length
-
Sleeve length
-
Waist
-
Inseam
-
Finished garment size
Uneven Panels
Different sections of fabric may relax differently.
Panels cut under different tension conditions may not behave identically during sewing or washing.
Fabric Consumption Errors
Marker planning is based on available fabric dimensions.
If actual usable width changes after relaxation, the calculated fabric consumption may no longer be accurate.
Sewing Distortion
Unstable panels may stretch or contract during sewing.
This can contribute to:
-
Seam puckering
-
Panel mismatch
-
Twisting
-
Shape distortion
Fabric Relaxation vs Fabric Shrinkage
These two terms are related but not identical.
Fabric Relaxation
Relaxation describes dimensional changes that occur when stored mechanical tension is released.
Fabric Shrinkage
Shrinkage usually refers to dimensional reduction after processes such as:
-
Washing
-
Drying
-
Heat treatment
-
Finishing
A fabric can therefore relax before cutting and still show additional shrinkage after washing.
For important garments, both properties should be considered.
Does Every Polyester Fabric Need the Same Relaxation Time?
No.
There is no universal relaxation time that is correct for every fabric.
The appropriate procedure depends on factors such as:
-
Fabric construction
-
Roll tension
-
Elastane content
-
GSM
-
Finishing
-
Factory process
-
Storage conditions
-
Supplier recommendations
Some factories use predetermined relaxation periods based on previous testing and production experience.
The correct approach is to establish a procedure for the specific fabric rather than applying one arbitrary time to every material.
How Is Fabric Relaxed?
A typical process may involve:
Step 1: Receive the Fabric
Check:
-
Fabric name
-
Quantity
-
GSM
-
DIA or width
-
Colour
-
Lot number
-
Roll number
Keep each roll traceable.
Step 2: Open the Roll
Remove excessive packing pressure and allow the fabric to move without unnecessary tension.
Step 3: Spread or Store Appropriately
Depending on the fabric and factory process, the fabric may be opened or placed in a condition that allows tension to reduce.
Avoid pulling or stretching the material unnecessarily.
Step 4: Allow the Fabric to Settle
Allow sufficient time according to the established production procedure.
Step 5: Recheck the Fabric
After relaxation, check:
-
Width
-
Surface appearance
-
Curling
-
Fabric shape
-
GSM where necessary
Step 6: Begin Marker Planning and Cutting
Use the actual relaxed fabric condition for production planning.
Why Width Should Be Checked After Relaxation
Width is one of the most important measurements in cutting.
Suppose a buyer orders:
Polyester Interlock
180 GSM
60 DIA
The nominal specification may indicate the expected fabric size.
However, the cutting department should work with the actual usable width of the received fabric.
After relaxation, measure the material again.
This helps determine how efficiently garment patterns can be arranged.
Relaxation and Fabric Consumption
Fabric consumption is one of the biggest cost factors in garment manufacturing.
If width becomes lower than expected:
Fewer garment panels may fit across the fabric.
This can increase the amount of fabric needed per garment.
For a small order, the difference may be minor.
For 10,000 garments, even a small consumption change can become financially significant.
That is why bulk costing should be based on realistic production conditions.
Relaxation and GSM
Fabric relaxation can also influence measured GSM.
Why?
GSM measures fabric weight within a given area.
If fabric dimensions change while the amount of material remains the same, the apparent weight per square metre can also change.
Therefore, GSM testing should follow a consistent conditioning and testing procedure.
Do not compare one fabric measured immediately under tension with another measured after relaxation and assume the results are directly equivalent.
What About Polyester-Lycra Fabric?
Relaxation becomes particularly important for fabrics containing elastane.
Examples include:
-
Polyester Lycra
-
2-Way Stretch
-
4-Way Stretch
-
Activewear fabrics
-
Legging fabrics
-
Stretch track-pant fabrics
Elastane fabrics can be sensitive to tension.
If stretched fabric is cut before reaching a stable condition, the panels may recover afterward and become smaller.
This can affect garment measurements significantly.
Fabric Relaxation for Sportswear
Sportswear frequently uses knitted polyester because it offers:
-
Lightweight performance
-
Stretch
-
Moisture management
-
Fast drying
-
Sublimation compatibility
Common sportswear constructions include:
-
Micro Honeycomb
-
Bird Eye
-
Interlock
-
Jacquard
-
Mesh
-
Dot Knit
-
Polyester Lycra
Before bulk cutting, manufacturers should evaluate the dimensional behaviour of the selected fabric.
This is especially important for fitted garments.
Fabric Relaxation for T-Shirts
T-shirt panels require consistent:
-
Body length
-
Chest width
-
Sleeve dimensions
-
Shoulder measurements
If fabric is unstable during cutting, finished garments may show measurement differences.
A controlled cutting process therefore starts with stable fabric.
Fabric Relaxation for Uniform Production
Uniform orders often contain hundreds or thousands of garments in repeated sizes.
Small dimensional differences can become noticeable when garments are issued together.
Examples include:
-
School uniforms
-
Corporate uniforms
-
Factory uniforms
-
Sports uniforms
-
Team jerseys
Consistent fabric preparation helps improve size consistency across the production batch.
Relaxation Before Sampling
Fabric relaxation should not only be considered during bulk production.
Sampling should represent the conditions that will be used for bulk manufacturing.
If a sample is cut from properly relaxed fabric but bulk production is cut immediately from tight rolls—or vice versa—the garments may behave differently.
For reliable development:
Sampling process ≈ Bulk production process
as closely as practical.
What Is Fabric Conditioning?
Fabric conditioning is related to relaxation but can have a broader meaning.
Conditioning may involve allowing the material to reach equilibrium with the surrounding environment before testing or production.
Environmental factors can include:
-
Temperature
-
Humidity
-
Storage conditions
In textile testing, controlled conditioning is particularly important when precise measurements are required.
Don't Stretch Fabric During Spreading
Relaxation can be wasted if fabric is stretched again during spreading.
When preparing fabric for cutting:
-
Avoid excessive pulling
-
Avoid unnecessary tension
-
Keep spreading conditions consistent
-
Watch for edge curling
-
Avoid distorting the grain or knit structure
The objective is to place the fabric naturally rather than forcing it into position.
Check Edge Curling
Some knitted fabrics may curl after being opened or cut.
This depends strongly on the knit structure.
Excessive curling can interfere with:
-
Layer alignment
-
Pattern placement
-
Cutting
-
Sewing
Fabric relaxation can reveal this behaviour before large quantities are cut.
Keep Dye Lots Separate
Fabric relaxation should not eliminate normal lot-control procedures.
If an order contains multiple dye lots, keep the rolls identified during:
Receiving → Inspection → Relaxation → Cutting
Avoid mixing rolls randomly.
This helps maintain shade consistency and traceability.
Relaxation Does Not Fix Defective Fabric
Relaxation is a preparation process.
It cannot automatically correct problems such as:
-
Incorrect GSM
-
Major shade variation
-
Holes
-
Knitting defects
-
Oil marks
-
Incorrect construction
-
Poor colour fastness
-
Excessive shrinkage
Fabric should still undergo normal incoming inspection.
What Should Buyers Ask Their Garment Factory?
If you are outsourcing garment manufacturing, useful questions include:
Do you relax knitted fabric before cutting?
How do you determine the relaxation requirement?
Do you recheck usable width before marker planning?
How do you handle stretch fabrics?
Are different fabric lots kept separately?
These questions are especially useful for large production orders.
Practical Fabric Relaxation Checklist
Before cutting:
-
Confirm fabric name
-
Confirm GSM
-
Confirm DIA or width
-
Confirm colour
-
Record dye lot
-
Record roll number
-
Inspect the fabric
-
Open the fabric appropriately
-
Allow required relaxation
-
Avoid stretching during spreading
-
Recheck usable width
-
Check surface condition
-
Check curling
-
Recheck dimensional stability where required
-
Approve before cutting
Example Production Workflow
A practical knitted-fabric workflow can look like:
Fabric Received
↓
Roll Identification
↓
Fabric Inspection
↓
Shade Checking
↓
Fabric Relaxation
↓
Width / GSM Verification
↓
Marker Planning
↓
Spreading
↓
Cutting
↓
Sewing
↓
Garment Inspection
This approach allows potential fabric problems to be found before expensive garment production begins.
Why Buyers Should Care About Fabric Relaxation
A fabric buyer may think relaxation is only the garment factory's responsibility.
But it can also affect the buyer's:
-
Garment costing
-
Fabric requirement
-
Finished measurements
-
Delivery consistency
-
Rejection rate
-
Repeat orders
For this reason, brands sourcing both fabric and garments should understand how their manufacturing partner handles fabric before cutting.
Final Thoughts
Fabric relaxation is a simple step that can have a significant effect on knitted garment production.
Polyester knitted fabrics may contain tension from manufacturing, finishing, rolling and transportation.
Allowing the fabric to reach a more stable condition before cutting can help manufacturers work with more realistic:
Width → GSM → Dimensions → Fabric Consumption → Garment Measurements
The key lesson is:
Do not assume that fabric straight from a tightly packed roll is already in its final production condition.
Inspect it, allow appropriate relaxation, verify its dimensions and then proceed with bulk cutting.
Looking for Polyester Fabric for Garment Production?
Walrus – Yes India Can supplies polyester fabrics for:
-
T-shirts
-
Sportswear
-
Jerseys
-
Polo T-shirts
-
Uniforms
-
Track pants
-
Activewear
-
Garment manufacturing
Send your requirement with:
Fabric Name + GSM + DIA + Colour + Quantity + Delivery Location
WhatsApp / Call:
+91 90472 77722
+91 90420 77722
Website: yesindiacan.in
