Top 10 Quality Control Tests in Textile Dyeing and Printing

 

Top 10 Quality Control Tests in Dyeing and Printing

A successful dyeing or printing order is not judged only by how attractive the fabric looks when it leaves the production machine. Buyers also expect the colour to remain stable, the print to withstand washing and rubbing, and the fabric to maintain its required dimensions and strength.

Textile mills use laboratory and production-floor tests to check these requirements before fabric is approved for delivery. The exact testing plan depends on fibre type, fabric construction, colour, printing method and buyer specification.

Here are ten important tests that help control dyeing and printing quality.

1. Shade Matching and Colour Difference Test

The first question in colour production is simple: does the bulk fabric match the approved lab dip or colour standard?

Shade matching checks whether the production colour is consistent with the buyer-approved reference. A spectrophotometer can measure colour and calculate the difference using values such as CIELAB and ΔE.

Why it matters

• Helps identify shade variation between lab dips and bulk production.
• Supports consistency between batches and fabric rolls.
• Reduces the risk of buyer rejection due to colour mismatch.

Visual assessment under a controlled light source is also important. A shade may look correct under one type of lighting but different under another—a problem known as metamerism.

2. Colour Fastness to Washing Test

This test evaluates how well a dyed or printed fabric retains its colour during washing and whether colour transfers to adjacent fabrics.

A laboratory specimen is washed under specified conditions with suitable adjacent fabric. After testing, the colour change and staining are assessed using grey scales.

Common methods: ISO 105-C06 and AATCC TM61.

Why it matters: Poor wash fastness can cause fading, colour bleeding and staining of other garments during laundering. It is particularly important for everyday clothing, bed linen and washable printed fabrics.

3. Colour Fastness to Rubbing Test

Also known as the crocking test, this evaluates whether colour transfers from the fabric surface when rubbed.

A crockmeter moves a standard rubbing cloth against the specimen under specified conditions. The test is normally performed in both dry and wet states.

Common methods: ISO 105-X12 and AATCC TM8.

Why it matters: Poor rubbing fastness can create visible colour transfer during handling, wearing or use. It is especially important for dark shades, heavily printed fabrics and pigment-printed materials.

4. Colour Fastness to Perspiration Test

Textiles used close to the skin may come into contact with perspiration. This test checks whether sweat affects the fabric colour or causes staining on adjacent materials.

The specimen is exposed to artificial acidic and alkaline perspiration solutions under specified conditions. Colour change and staining are then assessed.

Common methods: ISO 105-E04 and AATCC TM15.

Why it matters: It helps determine whether dyed or printed fabrics can maintain acceptable colour performance during normal use, particularly in clothing.

5. Colour Fastness to Light Test

Sunlight and artificial light can gradually fade textile colours. The light fastness test evaluates a fabric's resistance to this fading.

In a common laboratory method, specimens are exposed to controlled artificial light, such as a xenon-arc source, and compared with reference standards.

Common methods: ISO 105-B02 and AATCC TM16 series.

Why it matters: It is important for curtains, upholstery, outdoor textiles and garments exposed to daylight. A fabric with poor light fastness may lose its original appearance during use.

6. Colour Fastness to Water Test

This test checks whether water causes colour change or staining on adjacent fabric.

A specimen is exposed to water under controlled laboratory conditions. After the specified treatment, the colour change and staining are evaluated.

Common method: ISO 105-E01.

Why it matters: It helps assess colour stability when textiles are exposed to water during use, storage or handling. Special applications may require additional tests for sea water or chlorinated pool water.

7. Fabric pH Test

The pH test measures the acidity or alkalinity of an aqueous extract from the textile material.

Residual processing chemicals from dyeing, washing and finishing can affect the final fabric pH. A laboratory measures the extract using a calibrated pH meter.

Common methods: ISO 3071 and AATCC TM81.

Why it matters

• Helps identify excessive acidic or alkaline residues.
• Supports control of chemical conditions in finished fabric.
• Helps mills meet buyer requirements for products intended for skin contact.

The acceptable pH range must follow the applicable product specification or buyer requirement; one limit should not be assumed for every textile product.

8. Dimensional Stability and Shrinkage Test

Fabric dimensions can change during washing, drying or other care processes. This test measures changes in length and width after a specified treatment.

The specimen is measured before and after the washing and drying procedure. Dimensional change is then calculated as a percentage.

Common methods: ISO 6330 with ISO 5077 for washing and dimensional-change assessment; AATCC TM135 is also widely used.

Why it matters: Excessive shrinkage can affect garment measurements, fit and production planning. It is particularly important for knitted cotton fabrics and other materials that may relax or shrink during laundering.

9. Fabric Strength Test

Dyeing and printing processes must preserve the fabric's required mechanical performance. Strength testing checks whether the material can withstand forces during manufacturing and use.

Two common approaches are:

• Tensile strength: Measures the force required to break a fabric strip. ISO 13934-1 is a common strip-method standard.
• Bursting strength: Measures the pressure required to rupture a fabric specimen, making it particularly relevant to knitted fabrics. ISO 13938-2 is a common method.

Why it matters: Excessive chemical treatment, unsuitable processing conditions or poor raw-material quality can contribute to strength loss. Testing helps mills identify damage before fabric is released.

10. Print Quality and Print Durability Test

Printed fabric needs more than attractive colours. The design must be clear, correctly positioned and durable enough for its intended use.

Print quality inspection commonly examines:

• Registration: Whether different colours and design elements align correctly.
• Sharpness: Whether outlines and fine details remain clear.
• Coverage: Whether the printed area has uniform colour without unwanted gaps.
• Penetration: Whether colour distribution through the fabric meets the product requirement.
• Surface defects: Whether there are smudges, streaks, pinholes or unwanted marks.

Print durability is then evaluated using relevant fastness tests, especially washing and rubbing. The appropriate method depends on the printing technology, ink or paste system and end-use requirement.

For example, pigment printing relies on a binder system to hold pigment on the fabric surface. Inadequate fixation or unsuitable curing conditions may reduce print durability.

Quick Reference: The 10 Tests at a Glance

No.	Test	Common standard or method
1	Shade matching / colour difference	CIELAB, ΔE; buyer-approved method
2	Washing fastness	ISO 105-C06 / AATCC TM61
3	Rubbing fastness	ISO 105-X12 / AATCC TM8
4	Perspiration fastness	ISO 105-E04 / AATCC TM15
5	Light fastness	ISO 105-B02 / AATCC TM16
6	Water fastness	ISO 105-E01
7	Fabric pH	ISO 3071 / AATCC TM81
8	Dimensional stability	ISO 6330 + ISO 5077 / AATCC TM135
9	Fabric strength	ISO 13934-1 / ISO 13938-2
10	Print quality and durability	Visual inspection + relevant fastness tests

How Textile Mills Can Build a Strong QC System

Having testing equipment is not enough. A reliable quality control system must connect laboratory results with actual production decisions.

1. Test before bulk production. Approve lab dips, print samples and required performance results before starting large orders.

2. Monitor production batches. Take representative samples at suitable stages, including after dyeing, printing, washing and finishing.

3. Use the correct test method. Follow the buyer's specification and the applicable current standard. Different methods can use different conditions, so results should not be compared without checking the method.

4. Record and analyse results. Maintain test reports for shade, fastness, pH, shrinkage and strength. Comparing batch records can reveal recurring process problems.

5. Take corrective action. If a result fails, investigate the cause before releasing the fabric. Possible causes include incorrect chemical dosing, insufficient washing, uneven fixation, unsuitable curing or inconsistent process conditions.

Quality Testing Is a Production Investment

Quality control is not simply the final step before shipment. It is a continuous process that helps textile mills prevent defects, maintain buyer confidence and control production costs.

The ten tests discussed here cover major areas of dyeing and printing performance, from shade accuracy and colour fastness to fabric strength and print durability. Not every order requires all ten tests, and additional tests may be necessary for specialised products.

The best QC system is one that selects the right tests for the product, follows recognised methods and uses the results to improve production—not just to prepare a final inspection report.