From Production floor to solution
Solving Uneven Dye Uptake
In Real
textile Mills
A practical case and 3 proven approaches that make a difference
Case Story
A Blended Fabric Mill Facing Lengthwise
Uneven Dyeing
Customer Profile:
Specializes in knitwear exhaust dyeing
Works with PC (Polyester/Cotton) and CVC blends
Also processes double-face fabrics and Polyester/Viscose blends
Generally stable production in standard PC and CVC systems
Key Process Note:
Uses exhaust dyeing process
Applies same wetting agent for polyester and cotton fibers
Technical Challenge
Occasional uneven dyeing on polyester component
Observed mainly in double-face and blended fabric structures
Oil washing pretreatment tried, but issue still exists
The Challenge
Persistent streaks and shadevariation along fabric length, even through dye recipes and machine parameters were kept consistent
What We Found
* Different wetting behavior C/P
* Uneven liquor pick-up during padding
* Sensitivity to small variations in surface energy
The Results After
* More uniform dye upstake
* Reduced rework
* Better batch to batch consistency
* More stable production process
How does this work?
3 Different DIrections. 1 Common Goal - Consistent Dyeing
1 Wetting & Surface Absorptise Control
Process Additives Level
Non-uniform wetting and liquor pick-up during padding or dyeing
- Improves wetting uniformity
- Controls absorbency across
- Reduces streaks and shade variation
More uniform liquor distribution, less re-dyeing and better repeatablibity
2 Functional Masterbatch
Fiber consistency Level
Incosistent additive dispersion and fiber surface behavior in polyester-rich blends
- Enhances dispersion stability
- Tunes surface energy and hydrophilicity
- Improves dye affinity balance between polyester and cotton
More consistent shade development and reduced batch-to batch variation
3 Modified Polyester
Polymer Design Level
Polymer behavior that affects fiber formation, process stability, and long-term uniformity
- Improves melt stability
- optimizes crystallization behavior
- Enables more stable processing window
Better structure uniformity, and long-term consistency
our Polymer-Specific Solution
ECDP
- Enables atmospheric dyeing → energy saving & lower processing cost
- Ideal for differential dyeing → high value-added effects (two-tone / mélange / cross-dyeing)
- Compatible with boil dyeing using disperse dyes
- Suitable for fashion, home textiles, and decorative fabrics
CDP
- Compatible with 130°C high-temperature dyeing processes (aligned with regular polyester systems)
- Ensures better dyeing uniformity and process stability
- Suitable for complex fabric structures and large-scale industrial production
- Widely used in blended fabrics (PC, PV) and double-face construction
HCDP
- Can be blended with acrylic and wool for cationic one-bath dyeing
- Suitable for melt blending with recycled PET chips → supports sustainable fiber production
- Applicable for staple fiber production and downstream spinning applications
- Enhances process flexibility and material compatibility
ECCDP
- Excellent overall performance in BCF & FDY filament applications
- Performance comparable to nylon in selected applications
- Offers superior elasticity, meeting part of PBT-based application requirements
- Suitable for carpets, industrial yarns, and elastic textile applications
Key Takeway
Dyeing inconsistency is not just a dyeing issue.
Its a materials + process ineraction.
Identify the real root cause –
Wetting, Fiber Consistency or Polymer Behavior –
and the solution becomes much more predictable,
Have you faced similar challenges in your mill?
I’d be interested to hear your experience and approach
© HanLink Polyester 2026
