Fabric pick-up links the pretreatment bath to the chemical and water load carried by reactive inkjet fabric. Measure the net liquor gain on a stated initial fabric-mass basis, then estimate component add-on from the bath composition. Keep this application measurement separate from residual moisture at printing. Compare color, edge definition and penetration after the required fixation and wash-off; neither more nor less pick-up is automatically better.<\/p>\n\n\n\n
Fabric pick-up describes how much pretreatment liquor remains on the textile after an application step such as padding.<\/p>\n\n\n\n
For a simple gravimetric check:<\/p>\n\n\n\n
Net wet pick-up (%) = 100 \u00d7 (m\u2081 \u2212 m\u2080) \u00f7 m\u2080.<\/strong> Here m\u2080 is the same specimen’s initial fabric mass on the stated conditioning or dry basis, and m\u2081 is its mass immediately after application. Do not call a conditioned fabric mass an oven-dry mass or compare the two bases without conversion.<\/p>\n\n\n\n This number is important because the pretreatment formula in the tank does not directly tell the mill how much thickener, alkali, urea, salt or other auxiliary is actually carried by the fabric.<\/p>\n\n\n\n The real chemical add-on depends on both:<\/p>\n\n\n\n Estimated component add-on (% on the stated fabric basis) = net wet pick-up (%) \u00d7 component mass fraction in the uniform bath.<\/strong> If component concentration is entered as a percentage instead of a fraction, divide the product of the two percentages by 100.<\/p>\n\n\n\n Two fabric rolls can pass through the same pretreatment bath but receive different chemical add-on if their pick-up differs.<\/p>\n\n\n\n This can happen because of changes in:<\/p>\n\n\n\n For reactive digital printing, pick-up should therefore be recorded as a process parameter rather than treated as an incidental machine setting.<\/p>\n\n\n\n Operators often record padder pressure because it is visible on the machine.<\/p>\n\n\n\n However, the same nominal pressure does not guarantee the same wet pick-up.<\/p>\n\n\n\n Actual pick-up can change when:<\/p>\n\n\n\n This is why a digital printing pretreatment trial should record the measured fabric weight before and immediately after padding.<\/p>\n\n\n\n Pressure is a machine input.<\/p>\n\n\n\n Pick-up is the process result that determines how much pretreatment reaches the fabric.<\/strong><\/p>\n\n\n\n When mills compare two pretreatment products without controlling pick-up, they may incorrectly attribute differences in color or bleeding to the chemistry when the real cause is different chemical add-on.<\/p>\n\n\n\n Consider a pretreatment bath containing a thickener, alkali, moisture-management component and other auxiliaries.<\/p>\n\n\n\n If the fabric retains more liquor, it generally carries more of every dissolved or dispersed component in that bath, assuming the bath remains uniform.<\/p>\n\n\n\n This means changing pick-up can change several variables at the same time:<\/p>\n\n\n\n This is one reason pick-up optimization cannot be reduced to a simple statement such as \u201chigher pick-up gives more color.\u201d<\/p>\n\n\n\n Higher pick-up changes the complete chemical and moisture environment of the fabric.<\/p>\n\n\n\n Published studies on reactive inkjet pretreatment have repeatedly shown that pretreatment composition\u2014including sodium alginate, alkali and urea\u2014can materially influence color yield, dye fixation, penetration and boundary clarity. This reinforces the need to control how much of that formulation is actually applied to the fabric.<\/p>\n\n\n\n For research context, see studies on factors affecting reactive inkjet color yield<\/a> \u0442\u0430 pretreatment effects on reactive ink-drop spreading and color performance<\/a>.<\/p>\n\n\n\n Color yield in reactive inkjet printing depends on more than the amount of ink deposited.<\/p>\n\n\n\n The pretreatment must provide a suitable environment for:<\/p>\n\n\n\n If pick-up is below the useful process window, the fabric may carry insufficient pretreatment chemicals to control the ink and support fixation.<\/p>\n\n\n\n If pick-up is increased into an appropriate range, color yield may improve because the pretreatment environment becomes more effective.<\/p>\n\n\n\n However, increasing pick-up beyond the useful range does not guarantee continued improvement.<\/p>\n\n\n\n Excessive chemical and water add-on can alter:<\/p>\n\n\n\n Therefore, the relationship between pick-up and color yield is better treated as an optimization curve rather than a straight line.<\/p>\n\n\n\n More pick-up is not automatically more color.<\/strong><\/p>\n\n\n\n Bleeding occurs when ink spreads laterally beyond the intended printed boundary.<\/p>\n\n\n\n Pretreatment helps control this by changing the way the fabric surface absorbs and retains the ink droplets.<\/p>\n\n\n\n Pick-up influences bleeding because it changes:<\/p>\n\n\n\n At insufficient pick-up, there may not be enough polymer or functional chemistry to control ink movement.<\/p>\n\n\n\n At excessive pick-up, the fabric may contain too much moisture or an overly heavy surface layer, which can create a different diffusion environment.<\/p>\n\n\n\n The correct result depends on the balance between:<\/p>\n\n\n\n Surface Retention \u2194 Lateral Spreading \u2194 Through-Fabric Penetration<\/strong><\/p>\n\n\n\n Published research has identified pretreatment as a major factor controlling reactive ink-droplet spreading and final color performance on cotton fabrics.<\/p>\n\n\n\n This supports using edge sharpness together with color yield when optimizing pick-up.<\/p>\n\n\n\n Possible symptoms of insufficient pick-up include:<\/p>\n\n\n\n However, a low color result should not automatically be corrected by increasing pick-up.<\/p>\n\n\n\n First verify:<\/p>\n\n\n\n If these variables are not controlled, increasing pick-up can hide the real problem rather than solve it.<\/p>\n\n\n\n Excessive pick-up can create its own production problems.<\/p>\n\n\n\n Potential effects include:<\/p>\n\n\n\n If the fabric is printed in a wet or partially wet state, excessive pick-up can also increase the risk of uncontrolled ink diffusion.<\/p>\n\n\n\n The best pick-up is therefore the lowest level that reliably supports the required print and fixation performance within a stable production window.<\/p>\n\n\n\n That level must be established experimentally for the specific process.<\/p>\n\n\n\n Woven cotton often provides relatively stable open-width handling, but pick-up can still change with fabric weight, weave density and pretreatment history.<\/p>\n\n\n\n Viscose can absorb water rapidly and may show stronger response to changes in wet pick-up.<\/p>\n\n\n\n Monitor:<\/p>\n\n\n\n Knitted fabrics can change width and weight under tension and moisture.<\/p>\n\n\n\n Measured pick-up may therefore be affected by:<\/p>\n\n\n\n A target developed on woven cotton should not automatically be transferred to knit fabric.<\/p>\n\n\n\n The viscosity of the pretreatment liquor can influence how it wets, penetrates and remains on the fabric during application.<\/p>\n\n\n\n However:<\/p>\n\n\n\n Same viscosity does not mean the same pick-up or printing performance.<\/strong><\/p>\n\n\n\n Two pretreatment polymers can have similar measured viscosity but different:<\/p>\n\n\n\n The measurement method should therefore be defined, including concentration, temperature, instrument and rotational speed.<\/p>\n\n\n\n For production, evaluate both the bath properties and the actual treated fabric.<\/p>\n\n\n\n Higher pick-up means the fabric enters the dryer carrying more water.<\/p>\n\n\n\n This can influence:<\/p>\n\n\n\n During drying, water movement can redistribute dissolved chemicals.<\/p>\n\n\n\n If drying is too rapid or uneven, the final distribution of alkali, urea and polymer may differ across the fabric or through its thickness.<\/p>\n\n\n\n Therefore, when pick-up is changed, the mill should also review the drying conditions.<\/p>\n\n\n\n Changing pick-up while keeping an unsuitable dryer setting constant can create a misleading trial.<\/p>\n\n\n\n Pick-up becomes even more critical in wet-on-wet or controlled wet-state printing because part of the pretreatment water remains on the fabric when inkjet printing begins.<\/p>\n\n\n\n In this route, pick-up influences both:<\/p>\n\n\n\n This means the same pick-up can behave differently depending on the delay between pretreatment and printing.<\/p>\n\n\n\n A wet-on-wet trial should therefore record:<\/p>\n\n\n\n The correct target is not \u201cmaximum wetness.\u201d<\/p>\n\n\n\n It is a reproducible wet-state window that maintains ink control and machine stability.<\/p>\n\n\n\n Use the same representative specimen before and after application. Record its initial mass, conditioning or drying method, area and handling procedure. Keep the selected reference basis consistent across candidates and production checks.<\/p>\n\n\n\n Use the defined padder, coating or pretreatment method.<\/p>\n\n\n\n Avoid unnecessary delay because evaporation changes the result.<\/p>\n\n\n\n Net wet pick-up (%) = 100 \u00d7 (mass immediately after application \u2212 initial specimen mass) \u00f7 initial specimen mass.<\/strong> Report the initial fabric-mass basis with the result.<\/p>\n\n\n\n Where practical, sample:<\/p>\n\n\n\n This can reveal uneven nip pressure or fabric absorption.<\/p>\n\n\n\n A single measurement at startup may not represent the full batch.<\/p>\n\n\n\n The component calculation assumes the measured net gain represents retained, well-mixed liquor. It is an estimate, not a component assay. Initial fabric moisture exchange, extractable material, selective retention, drainage or evaporation between weighings can affect that assumption.<\/p>\n For a solids-related change, use the pretreatment solids and dry-add-on guide<\/a>. Keep the approved ink and equipment conditions when establishing the actual process window.<\/p>\n\n\n\n Rather than adopting a universal target, build a working curve for the actual fabric and formula.<\/p>\n\n\n\n Choose a controlled range that the machine can reproduce safely.<\/p>\n\n\n\n This allows the effect of pick-up to be isolated.<\/p>\n\n\n\n Use the same fabric lot, ink lot and printer settings.<\/p>\n\n\n\n If testing a dry route, record the final moisture condition.<\/p>\n\n\n\n Include:<\/p>\n\n\n\n Finished reactive print performance must be compared after fixation and wash-off.<\/p>\n\n\n\n Record each pick-up level against:<\/p>\n\n\n\n The useful operating window is the range that balances these properties rather than maximizing only one response.<\/p>\n\n\n\n Once the working window is defined, production control should focus on repeatability.<\/p>\n\n\n\n Monitor:<\/p>\n\n\n\n If the target print result begins to drift, compare actual pick-up before changing the chemical formula.<\/p>\n\n\n\n This is especially important after:<\/p>\n\n\n\n Check whether chemical add-on is below the validated process window.<\/p>\n\n\n\n Also verify steaming and pretreatment chemistry before increasing pick-up.<\/p>\n\n\n\n Check:<\/p>\n\n\n\n Compare left-center-right pick-up.<\/p>\n\n\n\n Also review:<\/p>\n\n\n\n Then investigate:<\/p>\n\n\n\n Pick-up is important, but it is not the only variable affecting reactive inkjet color yield.<\/p>\n\n\n\n \u041f\u043e\u0440\u0456\u0432\u043d\u044f\u0439\u0442\u0435:<\/p>\n\n\n\n Pick-up is also a commercial variable because it changes the amount of chemistry and water carried by the fabric.<\/p>\n\n\n\n Higher pick-up can increase:<\/p>\n\n\n\n Insufficient or unstable pick-up can increase:<\/p>\n\n\n\n A useful evaluation is:<\/p>\n\n\n\n Cost per accepted m\u00b2 = total non-overlapping in-scope run cost \u00f7 accepted finished-fabric area.<\/strong> Convert chemical consumption, drying, printing, fixation, washing and additional rework or disposal expenses into one currency. Pick-up and yield affect those costs and the accepted-output denominator; they are not monetary amounts to add separately. Count material used in rejects and rework once.<\/p>\n\n\n\n The most economical pick-up is therefore not automatically the lowest possible value.<\/p>\n\n\n\n It is the lowest stable value that delivers the required finished textile quality within a controllable production window.<\/p>\n\n\n\n For a useful reactive digital pretreatment recommendation, provide:<\/p>\n\n\n\n FSX Chemical can use this information through its \u0417\u0440\u0430\u0437\u043a\u0438 \u0442\u0430 \u043f\u0456\u0434\u0431\u0456\u0440<\/a> process to select a relevant reactive digital printing paste candidate for controlled evaluation.<\/p>\n\n\n\n The most reliable sequence is:<\/p>\n\n\n\n Current Formula \u2192 Measured Pick-Up \u2192 Same-Fabric Trial Range \u2192 Digital Printing \u2192 Steaming \u2192 Washing \u2192 Color and Bleeding Evaluation \u2192 Production Verification<\/strong><\/p>\n\n\n\n \u041e\u0441\u043d\u043e\u0432\u043d\u0438\u043c\u0438 \u043f\u0440\u0438\u043d\u0446\u0438\u043f\u0430\u043c\u0438 \u0454:<\/p>\n\n\n\n This approach turns fabric pick-up from an operator setting into a controlled reactive digital printing parameter.<\/p>\n\n\n\n It is the net mass gain after applying pretreatment relative to a stated initial fabric-mass basis. Together with a known, uniform bath composition, it supports an estimate of chemical add-on; it is not a direct measurement of water remaining at printing.<\/p>\n\n\n\n Subtract the initial mass of the same fabric specimen from its mass immediately after application, divide by the initial mass and multiply by 100. State whether that initial mass was conditioned or determined by a validated dry-basis procedure.<\/p>\n\n\n\n It can improve color within some process ranges because more pretreatment chemistry is applied, but higher pick-up does not guarantee higher color indefinitely. Excessive add-on can change spreading, drying and wash-off.<\/p>\n\n\n\n It can contribute, especially when excessive moisture or unsuitable pretreatment rheology increases lateral ink diffusion. Ink loading and fabric absorbency must also be checked.<\/p>\n\n\n\n Yes, if the fabric receives insufficient thickener, alkali or other required pretreatment components. However, steaming and formulation should also be checked.<\/p>\n\n\n\n No. Pressure influences pick-up, but actual retained liquor also depends on fabric, rollers, speed, bath properties and tension. Pick-up should be measured.<\/p>\n\n\n\n There is no universal percentage. The correct range depends on fabric weight and absorbency, pretreatment formula, application equipment, drying or wet-state route, ink and fixation conditions.<\/p>\n\n\n\n Not necessarily. Viscose can have different absorbency and swelling behavior, so the working window should be validated separately.<\/p>\n\n\n\n Different viscosity, rheology, wetting and fiber interaction can change liquor retention even when the padder settings remain the same.<\/p>\n\n\n\n It should be checked often enough to confirm the process remains within the validated window, especially after startup, fabric-lot changes, speed changes or machine adjustments.<\/p>\n\n\n\n It becomes particularly important because it influences both chemical add-on and the fabric moisture state at printing.<\/p>\n\n\n\n Send the fabric type, pretreatment formula, viscosity method, measured pick-up, dry or wet printing route, ink system, printer settings, steaming and washing conditions, plus photos or samples where available.<\/p>\n\n\n\n If your reactive inkjet production shows unstable color yield, bleeding or inconsistent pretreatment performance, FSX Chemical can help evaluate whether the problem is related to pretreatment chemistry, pick-up, fabric or process conditions.<\/p>\n\n\n\n For a more relevant comparison, send:<\/p>\n\n\n\n \u041f\u043e\u0447\u043d\u0456\u0442\u044c \u0437 \u0417\u0440\u0430\u0437\u043a\u0438 \u0442\u0430 \u043f\u0456\u0434\u0431\u0456\u0440<\/a> to establish a controlled candidate and process comparison.<\/p>\n\n\n\n You can also review the FSX Chemical Digital Printing Paste<\/a> route or \u0417\u0430\u043c\u043e\u0432\u0438\u0442\u0438 \u043f\u0440\u043e\u043f\u043e\u0437\u0438\u0446\u0456\u044e \u0431\u0435\u0437\u043f\u043e\u0441\u0435\u0440\u0435\u0434\u043d\u044c\u043e \u0432\u0456\u0434 \u0432\u0438\u0440\u043e\u0431\u043d\u0438\u043a\u0430<\/a> once the technically suitable direction is clear.<\/p>\n\n\n\n For technical discussion, \u0417\u0432\u2019\u044f\u0436\u0456\u0442\u044c\u0441\u044f \u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0456\u0454\u044e FSX Chemical<\/a> with your current TDS, fabric information and pretreatment data\ud83d\udce7\u00a0\u0415\u043b\u0435\u043a\u0442\u0440\u043e\u043d\u043d\u0430 \u043f\u043e\u0448\u0442\u0430: Service@fsxchemical.com<\/a><\/strong><\/p>\n\n\n\n Fabric pick-up should not be treated as a hidden machine setting. It is the link between the pretreatment formula in the tank and the actual chemical environment seen by every reactive ink droplet on the fabric.<\/strong><\/p>","protected":false},"excerpt":{"rendered":" Fabric pick-up determines how much pretreatment chemistry and water actually remain on the fabric after application. Too little or excessive pick-up can change color yield, bleeding, penetration, drying and fixation. This guide explains how to measure and optimize a stable working window for reactive inkjet printing.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_titles_title":"Reactive Inkjet Fabric Pick-Up: Add-On and Bleeding Control","_seopress_titles_desc":"Define reactive inkjet fabric pick-up, component add-on and moisture separately. 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Why Pick-Up Matters More Than Padder Pressure Alone<\/h2>\n\n\n\n
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How Pick-Up Changes the Actual Chemical Add-On<\/h2>\n\n\n\n
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How Pick-Up Can Affect Color Yield<\/h2>\n\n\n\n
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How Pick-Up Can Affect Bleeding and Edge Sharpness<\/h2>\n\n\n\n
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What Happens When Pick-Up Is Too Low?<\/h2>\n\n\n\n
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What Happens When Pick-Up Is Too High?<\/h2>\n\n\n\n
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Cotton, Viscose, Woven and Knitted Fabrics Do Not Behave the Same<\/h2>\n\n\n\n
Woven Cotton<\/h3>\n\n\n\n
\u0412\u0456\u0441\u043a\u043e\u0437\u0430<\/h3>\n\n\n\n
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Knitted Cellulosic Fabrics<\/h3>\n\n\n\n
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Pretreatment Rheology, Absorbency and Pick-Up Uniformity<\/h2>\n\n\n\n
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Pick-Up, Drying and Chemical Migration<\/h2>\n\n\n\n
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Pick-Up in Wet-on-Wet Reactive Inkjet Printing<\/h2>\n\n\n\n
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How to Measure Fabric Pick-Up Correctly<\/h2>\n\n\n\n
Step 1: Define and Weigh the Fabric Reference<\/h3>\n\n\n\n
Step 2: Apply the Pretreatment<\/h3>\n\n\n\n
Step 3: Weigh Immediately After Application<\/h3>\n\n\n\n
Step 4: Calculate Wet Pick-Up<\/h3>\n\n\n\n
Step 5: Repeat Across the Fabric<\/h3>\n\n\n\n
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Step 6: Repeat During the Production Run<\/h3>\n\n\n\n
Check the Retained-Liquor Estimate Before Using It as a Chemical Specification<\/h3>\n
How to Build a Pick-Up Working Curve<\/h2>\n\n\n\n
Step 1: Select Several Practical Pick-Up Levels<\/h3>\n\n\n\n
Step 2: Keep the Pretreatment Formula Constant<\/h3>\n\n\n\n
Step 3: Keep Fabric and Ink Constant<\/h3>\n\n\n\n
Step 4: Dry or Condition Each Sample Consistently<\/h3>\n\n\n\n
Step 5: Print a Diagnostic Pattern<\/h3>\n\n\n\n
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Step 6: Steam and Wash Identically<\/h3>\n\n\n\n
Step 7: Plot the Result<\/h3>\n\n\n\n
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How to Control Pick-Up in Production<\/h2>\n\n\n\n
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Troubleshooting Color Yield and Bleeding Problems<\/h2>\n\n\n\n
Problem: Low Color Yield and Low Pick-Up<\/h3>\n\n\n\n
Problem: Strong Color but Excessive Bleeding<\/h3>\n\n\n\n
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Problem: Uneven Color Across the Width<\/h3>\n\n\n\n
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Problem: Pick-Up Is Stable but Color Still Changes<\/h3>\n\n\n\n
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Problem: Lab Pick-Up Works but Production Fails<\/h3>\n\n\n\n
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How Pick-Up Affects Total Cost in Use<\/h2>\n\n\n\n
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What Information Should You Send to a Pretreatment Supplier?<\/h2>\n\n\n\n
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How Should a Mill Optimize Fabric Pick-Up?<\/h2>\n\n\n\n
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\u041f\u043e\u0448\u0438\u0440\u0435\u043d\u0456 \u0437\u0430\u043f\u0438\u0442\u0430\u043d\u043d\u044f<\/h2>\n\n\n\n
1. What is fabric pick-up in reactive digital printing?<\/h3>\n\n\n\n
2. How do you calculate wet pick-up?<\/h3>\n\n\n\n
3. Does higher pick-up increase color yield?<\/h3>\n\n\n\n
4. Can high pick-up cause bleeding?<\/h3>\n\n\n\n
5. Can low pick-up cause weak color?<\/h3>\n\n\n\n
6. Is padder pressure the same as pick-up?<\/h3>\n\n\n\n
7. What is the best pick-up percentage for cotton reactive inkjet printing?<\/h3>\n\n\n\n
8. Does viscose need the same pick-up as cotton?<\/h3>\n\n\n\n
9. Why does pick-up change after changing the pretreatment paste?<\/h3>\n\n\n\n
10. How often should pick-up be checked in production?<\/h3>\n\n\n\n
11. Is pick-up more important in wet-on-wet printing?<\/h3>\n\n\n\n
12. What data should I send FSX Chemical if I have a bleeding problem?<\/h3>\n\n\n\n
Optimize Reactive Digital Pretreatment Pick-Up with FSX Chemical<\/h2>\n\n\n\n
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