Reactive, Disperse, Pigment and Digital Textile Printing: How to Choose the Right Thickener Route

Technical Guide Printing Process & Thickener Selection Updated July 2026 Direct Answer

Choose a textile printing thickener or pretreatment route by identifying the fabric, colourant system, printing method and fixation process before comparing viscosity or price. Sodium alginate is commonly used as a benchmark for reactive screen printing on cellulosic fabrics. Disperse printing on polyester requires a route compatible with disperse dyes and heat fixation. Conventional pigment printing normally depends on a synthetic thickener and binder system. Digital textile printing requires a process-specific pretreatment selected for reactive, disperse or pigment inkjet printing.

Colourant System
vs Printing Method

Reactive, disperse and pigment describe different colourant and fixation systems. Digital describes the method used to place ink droplets on the textile. Digital textile printing can therefore use reactive ink, disperse ink or pigment ink. A “digital printing paste” must be selected according to the specific digital ink and fabric route rather than treated as one universal fourth dye system.

Selection Hierarchy

Six Questions to Answer Before Selecting a Thickener

Product selection should follow the production route. Starting with a viscosity number or product price can lead to an unsuitable comparison. QUESTION 01

What Is the Fabric?

Confirm cotton, viscose, lyocell, polyester, silk, wool or a blended fabric before selecting the colourant and paste route. QUESTION 02

Which Colourant?

Identify reactive dye, disperse dye, pigment ink or another dye class. Different colourants require different fixation chemistry. QUESTION 03

Screen or Digital?

Conventional screen paste and digital fabric pretreatment have different preparation, rheology and application requirements. QUESTION 04

How Is It Fixed?

Confirm steaming, thermofixation, sublimation or binder curing, together with the intended temperature and time. QUESTION 05

What Is the Main Problem?

Identify low colour yield, bleeding, poor sharpness, difficult wash-off, unstable paste or unacceptable fabric handle. QUESTION 06

How Will It Be Tested?

Define the laboratory method, application trial and acceptance criteria before comparing candidate products.

Quick Process Matrix

Printing Process and Starting Thickener Route

The table provides an initial selection framework. Final suitability must be confirmed using the intended recipe, fabric and machinery.

Printing Route	Typical Fabric	Starting Thickener or Paste Route	Fixation / Post-Treatment	Main Evaluation Points
Reactive screen printing	Cotton, viscose, lyocell and suitable cellulosic fabrics	Sodium alginate benchmark; selected reactive CMS route may be evaluated	Steaming followed by washing and removal of unfixed dye and thickener	Colour yield, definition, penetration, wash-off and handle
Disperse screen printing	Polyester and suitable polyester blends	Process-specific disperse printing thickener, including selected CMS or synthetic routes	Heat or steam fixation according to the dye and production route	Dispersion, screen running, fixation, sharpness and residue
Pigment screen printing	Cotton, polyester and many blended or mixed-fibre fabrics	Synthetic thickener combined with a compatible pigment binder and auxiliary system	Drying and binder curing	Rubbing fastness, colour strength, sharpness, curing and handle
Reactive digital printing	Cotton, viscose, lyocell, silk and suitable cellulosic routes	Reactive digital pretreatment or paste route such as DP-R	Steaming and wash-off	Ink bleeding, edge definition, colour development and wash-off
Disperse digital printing	Polyester and suitable polyester blends	Disperse digital pretreatment route such as DP-D, depending on direct or transfer printing	Heat fixation or sublimation	Penetration, sharpness, ink spreading, fixation and fastness
Pigment digital printing	Cotton, polyester and suitable blends	Pigment digital pretreatment route such as DP-P, coordinated with the binder-containing ink system	Drying and curing	Rubbing fastness, definition, colour strength and hand feel

Product names and internal model codes are not universal industry standards. Confirm the applicable TDS and trial procedure before use.

Reactive Screen Printing

Choosing a Thickener for Reactive Printing

Reactive dyes form chemical bonds with suitable fibres such as cotton and viscose during fixation. The thickener must control the printing paste without consuming a significant part of the reactive dye or preventing its transfer to the fibre.

Sodium alginate is widely used as the reference thickener for conventional reactive printing because its structure generally has limited reaction with reactive dyes and it can provide useful screenability, colour yield and wash-off performance when the complete process is controlled.^[1] 01

Sodium Alginate Route

Use sodium alginate as the initial benchmark when evaluating reactive screen printing on cotton, viscose or other suitable cellulosic fibres.

• Compare HV, MV and LV under the same test method
• Confirm stock-paste concentration
• Evaluate screen release and edge definition
• Review colour yield, wash-off and fabric handle

Review sodium alginate grades 02

Reactive CMS Route

A suitable high-substitution CMS grade or controlled blend may be evaluated when the mill is considering a different rheology or cost-performance route.

• Confirm grade suitability for reactive printing
• Compare colour yield and outline sharpness
• Check background cleanliness and wash-off
• Do not assume universal one-to-one replacement

Review CMS printing grades

CMC is not automatically a direct alginate replacement.

Selected CMC grades may be useful in specialty printing and other industrial systems, but conventional reactive printing suitability depends on degree of substitution, purity, dye interaction and the complete recipe. It must be proven through controlled trials.

Disperse Screen Printing

Choosing a Thickener for Polyester Disperse Printing

Disperse dyes are designed for hydrophobic fibres, particularly polyester. The printing paste must maintain a stable dye dispersion, transfer cleanly through the screen and release the dye during the selected heat-fixation process.

A reactive printing thickener should not be transferred directly to disperse printing simply because it gives a similar laboratory viscosity. The dye, auxiliary, acidity, heat treatment and residue requirements are different.

FS-05 CMS Route

FSX Chemical positions FS-05 as a starting CMS route for selected disperse screen-printing trials.

• Confirm powder dispersion and hydration
• Review screen running and paste stability
• Evaluate definition after fixation
• Check residue, washing and fabric handle

Synthetic Thickener Route

A process-specific synthetic thickener may also be used when the formulation requires low dosage, salt tolerance or a particular rheological profile.

• Confirm compatibility with dispersing agents
• Check the valid pH and electrolyte range
• Evaluate heat stability
• Review removal or residual-film behaviour

Direct printing and transfer printing are different routes.

Direct disperse printing places the colourant on the fabric before fixation. Sublimation transfer printing first prints transfer paper and then transfers the dye to polyester under heat. Their paste, coating and ink requirements should not be treated as identical.

Pigment Screen Printing

Why Pigment Printing Requires a Binder System

Pigments do not have the same fibre affinity or chemical fixation route as reactive and disperse dyes. In conventional pigment printing, the pigment is normally fixed to the fabric through a polymeric binder film.

The printing paste therefore commonly includes a pigment dispersion, synthetic thickener, binder and other auxiliaries. Research on textile pigment printing evaluates both colour properties and dry or wet rubbing fastness because binder formation and curing affect the final result.^[2]

Thickener Responsibilities

• Control screen-printing rheology
• Limit unwanted spreading
• Support even pigment distribution
• Remain compatible with the binder and auxiliaries

Binder Responsibilities

• Attach pigment particles to the fabric
• Develop rubbing and washing resistance
• Form correctly during curing
• Balance fastness with fabric softness

Do not select pigment paste by viscosity alone.

Binder compatibility, curing temperature, curing time, pigment loading, rubbing fastness and fabric handle may be more important than matching one initial viscosity value.

Digital Textile Printing

Why Digital Printing Uses a Separate Pretreatment Decision

In conventional screen printing, the dye, thickener and most auxiliaries are combined in the colour paste before application. In textile inkjet printing, many functional chemicals are instead applied to the fabric through pretreatment, while the printer jets a low-viscosity ink through fine nozzles.^[3]

The pretreatment helps control droplet spreading, penetration, edge definition, colour development and fixation. It must be selected according to the ink chemistry and textile substrate. DP-R

Reactive Digital Printing

DP-R is the FSX Chemical starting route for reactive inkjet pretreatment evaluation on suitable cellulosic and related fibres.

• Confirm fabric absorbency and preparation
• Review thickener, alkali and humectant requirements
• Evaluate bleeding, definition and colour development
• Confirm steaming and wash-off conditions

DP-D

Disperse Digital Printing

DP-D is the starting route for disperse inkjet evaluation on polyester and suitable polyester blends.

• Confirm direct or transfer printing
• Review coating or pretreatment dosage
• Evaluate droplet spreading and penetration
• Confirm heat fixation or sublimation

DP-P

Pigment Digital Printing

DP-P is the starting route for pigment inkjet pretreatment evaluation on suitable natural and synthetic fabrics.

• Confirm pigment ink and binder system
• Evaluate surface ink control and edge sharpness
• Review curing and rubbing fastness
• Balance colour strength with fabric handle

TEST

Digital Trial Boundary

Digital pretreatment must be tested with the actual printer, ink, waveform, resolution, fabric, drying and fixation process.

• Do not rely only on laboratory viscosity
• Check filtration and coating uniformity
• Review nozzle and machine compatibility
• Confirm production-side repeatability

Review digital printing paste routes

Fixation and Post-Treatment

Why Fixation Determines Product Selection

Route	Typical Fixation Direction	Post-Treatment Focus	Selection Risk
Reactive dye	Steaming or another validated reactive fixation process	Removal of unfixed dye, alkali, auxiliaries and thickener	Poor wash-off may reduce cleanliness and handle
Disperse dye	Heat fixation, high-temperature steaming or sublimation, depending on the route	Removal of surface dye or residual paste where required	Incorrect heat response may reduce colour or definition
Pigment	Binder drying and curing	Usually no dye wash-off route equivalent to reactive printing	Under-curing can reduce fastness; over-curing may affect handle
Digital inkjet	Depends on reactive, disperse or pigment ink chemistry	Must follow the corresponding ink and fibre route	“Digital” alone does not define the required fixation process

Performance Evaluation

What to Check During a Printing Trial

The same acceptance criteria should not be applied blindly to every process, but the following indicators provide a useful evaluation framework.

• Paste preparation and hydration
• Viscosity stability during use
• Screen release or pretreatment uniformity
• Edge definition and fine-line sharpness
• Colour yield or colour strength
• Ink or paste penetration
• Background cleanliness
• Bleeding or uncontrolled spreading
• Fixation efficiency
• Wash-off or residue removal
• Dry and wet rubbing fastness
• Final fabric handle

Rheology affects print application and definition.

Thickeners are used to control paste movement and reduce unwanted dye migration. The useful rheological profile depends on the application method rather than one universally ideal viscosity. ^[5]

Common Selection Errors

Six Mistakes to Avoid

Choosing by viscosity alone

Similar viscosity values do not prove equivalent dye compatibility, rheology, wash-off, fixation or fabric handle.

Ignoring fabric composition

Cotton, viscose and polyester require different colourant and fixation routes. A product proven on one fibre may fail on another.

Mixing screen and digital logic

Screen-printing colour paste and digital pretreatment perform different functions and should not be compared only by dosage or viscosity.

Ignoring fixation

A thickener or pretreatment must remain compatible with steaming, heat fixation, sublimation or binder curing.

Comparing price per kilogram only

Dosage, dye or ink consumption, washing, rejected fabric and batch adjustment may change the real production cost.

Skipping the production trial

Laboratory testing is useful for screening, but final approval requires the buyer’s actual machinery, recipe and process.

Buyer Information

What to Send for Process-Based Grade Matching

• Fabric composition and construction
• Reactive, disperse or pigment colourant
• Screen or digital printing method
• Direct or transfer digital route
• Current product name and specification
• Current recipe and dosage
• Target viscosity and test method
• Steaming, heating or curing conditions
• Current production problem
• Required fastness and fabric handle
• Monthly consumption
• Required TDS, SDS and batch COA

For viscosity comparisons, review how to compare textile printing thickener viscosity test methods .

For a material-route comparison, review the CMC, CMS, sodium alginate and digital printing paste selection guide .

FSX Chemical Routes

Product Routes Available for Initial Evaluation

Product Family	FSX Routes	Initial Application Direction	Required Confirmation
Sodium Alginate	HV / MV / LV	Reactive textile printing	Stock-paste concentration, print method, colour and wash-off
CMS	CN-R / FS-05 / H5	Reactive, disperse and selected specialty routes	Dye system, fabric, preparation, fixation and trial result
CMC	HD / MD / LD	Selected printing, specialty and industrial formulations	DS, viscosity method, purity and full recipe compatibility
Digital Printing Paste	DP-R / DP-D / DP-P	Reactive, disperse and pigment inkjet printing	Ink, fabric, product form, dosage, printer and fixation route

Buyer FAQ

Frequently Asked Questions

Which thickener is normally considered first for reactive printing?

Sodium alginate is commonly used as the initial benchmark for conventional reactive printing on cotton, viscose and suitable cellulosic fabrics. Selected CMS alternatives may also be tested, but they require controlled recipe and printing trials. Can the same thickener be used for reactive and disperse printing?

It should not be assumed. Reactive and disperse dye systems use different fabrics, auxiliaries, fixation conditions and post-treatment. A grade must be validated for the intended printing process. Is sodium alginate the default thickener for pigment printing?

No. Conventional pigment printing normally relies on a compatible synthetic thickener and binder system. Pigment fixation, curing, rubbing fastness and fabric handle must be evaluated together. Is digital printing paste mixed directly into the printer ink?

Not usually in the same way as conventional screen-printing colour paste. Many digital textile systems apply functional chemicals through fabric pretreatment, while the printer uses a separately formulated low-viscosity ink. Can one digital pretreatment be used for reactive, disperse and pigment inks?

It should not be assumed. Reactive, disperse and pigment inks have different fibre interactions, fixation processes and auxiliary requirements. Use a route developed and tested for the specific ink system. Is the lowest-priced thickener the lowest-cost option?

Not necessarily. Buyers should also consider dosage, colour yield, ink or dye consumption, washing, curing, rejected fabric, machine cleaning and batch consistency. What is required before approving a product for bulk supply?

Confirm the product grade, laboratory method, application trial, fixation route, final print result, batch specification, packing, documents and commercial conditions.

About This Technical Guide

Prepared by the FSX Chemical Technical Content Team for textile printing mills, dye and paste formulators, chemical distributors and procurement teams comparing process-specific thickener and digital pretreatment routes.

FSX Chemical
Foshan Fushixin Polymer Fiber Co., Ltd.
Updated July 2026

Technical References

Supporting Process and Printing Research

These sources provide technical context. Commercial product selection must still be confirmed using the applicable TDS, batch information and customer production trial.

1. Schneider, R. and Šostar-Turk, S. Research discussing sodium alginate and alternative thickeners in reactive dye printing. View research record
2. Neral, B., Šostar-Turk, S. and Vončina, B. “Properties of UV-cured pigment prints on textile fabric.” The study evaluates a pigment printing paste containing synthetic thickener, binder and pigment dispersion. View research record
3. “Recent developments in the preparatory processes for the digital printing of textiles.” Technical discussion of fabric pretreatment and digital textile printing workflow. View publication record
4. Research on disperse dye inkjet printing of polyester and the relationship between ink formulation, spreading, printability and heat fixation. View research record
5. “Rheological study of interactions between non-ionic surfactants and polysaccharide thickeners used in textile printing.” Technical discussion of rheology, shear behaviour and print definition. View research record

Start with the Printing Process, Not Only the Product Name

Send your fabric, dye or ink system, printing method, current product, viscosity method, fixation process and target result. FSX Chemical can review an initial sodium alginate, CMS, CMC or digital printing paste route for controlled sample evaluation.

Request Sample Matching Request a Quote