{"id":10981,"date":"2026-03-15T08:52:22","date_gmt":"2026-03-15T08:52:22","guid":{"rendered":"https:\/\/fsxchemical.com\/?p=10981"},"modified":"2026-10-09T07:56:26","modified_gmt":"2026-10-09T07:56:26","slug":"cms-vat-discharge-printing-production-approval-tests","status":"publish","type":"post","link":"https:\/\/fsxchemical.com\/bn\/blog\/cms-vat-discharge-printing-production-approval-tests\/","title":{"rendered":"CMS for Vat and Discharge Printing: What Should You Test Before Production Approval?"},"content":{"rendered":"<p class=\"wp-block-wd-paragraph wd-e9c7c8f8\"><em>A product offered within a CMS thickener range should enter a vat or discharge trial only after its exact grade, documented composition and intended application have been confirmed, but production approval should never be based on stock-paste viscosity alone. These routes can expose the thickener to strong alkali, reducing agents, electrolytes, heat, steaming and intensive washing. A CMS grade must therefore maintain useful paste rheology before printing, pass the screen consistently, resist unacceptable viscosity collapse during the realistic holding period, allow the vat or discharge chemistry to develop correctly, and wash away without leaving excessive residue. This guide explains how textile mills should separate vat and discharge trials and what to test before bulk production approval.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-98dabb6b\">Why Vat and Discharge Printing Need a Special CMS Qualification<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-094b6089\">Vat and discharge printing are chemically more demanding than a simple neutral thickener-in-water test.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-02ba8af0\">Depending on the route, the printing paste may contain:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Strong alkali<\/li>\n\n\n\n<li>Reducing agents<\/li>\n\n\n\n<li>\u0987\u09b2\u09c7\u0995\u09cd\u099f\u09cd\u09b0\u09cb\u09b2\u09be\u0987\u099f\u09b8\u09ae\u09c2\u09b9<\/li>\n\n\n\n<li>\u0986\u09b0\u09cd\u09a6\u09cd\u09b0\u09a4\u09be \u09a7\u09b0\u09c7 \u09b0\u09be\u0996\u09c7 \u098f\u09ae\u09a8 \u09aa\u09a6\u09be\u09b0\u09cd\u09a5<\/li>\n\n\n\n<li>Oxidation or post-treatment chemicals<\/li>\n\n\n\n<li>Dyes or pigments for colored discharge<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-14a55bc8\">These ingredients can change CMS viscosity, hydration state and rheology.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a451cab5\">At the same time, the thickener must not prevent the color chemistry from working.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0a71c9c1\">Research on two-phase vat dye printing has shown that thickeners undergo several transformations during spreading, drying and coagulation, so both wet-paste rheology and dried-thickener behavior matter. See <a href=\"https:\/\/doi.org\/10.1021\/ie100416m\">research on thickeners in vat dye textile printing<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-756ee660\">For an FSX product, request current grade-specific documentation before selecting a candidate. A CMS range name or a reference to a modified starch in technical literature does not establish the composition or suitability of every commercial grade.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0137e071\">Review the <a href=\"https:\/\/fsxchemical.com\/bn\/%e0%a6%aa%e0%a6%a3%e0%a7%8d%e0%a6%af\/%e0%a6%95%e0%a6%be%e0%a6%b0%e0%a7%8d%e0%a6%ac%e0%a6%95%e0%a7%8d%e0%a6%b8%e0%a6%bf%e0%a6%ae%e0%a6%bf%e0%a6%a5%e0%a6%be%e0%a6%87%e0%a6%b2-%e0%a6%b8%e0%a7%8d%e0%a6%9f%e0%a6%be%e0%a6%b0%e0%a7%8d%e0%a6%9a\/\">FSX Chemical CMS product range<\/a> and request a current grade recommendation for the intended printing route.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-152794fb\">Vat Printing and Discharge Printing Are Not the Same Test<\/h2>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-ea60d6c9\">Vat Printing<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-87ba9cec\">Vat dyes are normally applied in a form that must be converted into a soluble reduced state under alkaline conditions and then returned to the insoluble colored form through oxidation.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-00a2fa0b\">A simplified process may include:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-593da9f6\"><strong>Printing \u2192 Drying \u2192 Reduction \/ Alkaline Development \u2192 Steaming \u2192 Oxidation \u2192 Rinsing \/ Soaping \u2192 Drying<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-03f42af2\">The exact sequence depends on whether the mill uses a one-phase, two-phase or other vat-printing route.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-50faf467\">Discharge Printing<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3ce6bb2a\">Discharge printing starts with a dyed ground. A discharge paste is printed only where the mill wants to remove or modify the ground color.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2b26a69e\">A simplified process may be:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1dd7efa6\"><strong>Ground-Dyed Fabric \u2192 Discharge Printing \u2192 Drying \u2192 Steaming \/ Heat Development \u2192 Washing \u2192 Finished White or Colored Discharge<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-60ebbe88\">The chemical package depends on the ground dye, fabric and whether the target is white discharge or colored discharge.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-47206a01\">\u0985\u09a4\u098f\u09ac:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-751b0bdd\"><strong>Passing a vat-printing trial does not automatically approve the same CMS grade for discharge printing.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-106d786e\">What Role Does CMS Play in These Systems?<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8d4b6538\">This guide uses CMS as the product-range label being evaluated. Confirm the chemical identity of the specific grade from current supplier documentation rather than inferring it from that label. A process-matched thickener may be used to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Build paste viscosity<\/li>\n\n\n\n<li>Control paste transfer through the screen<\/li>\n\n\n\n<li>Limit uncontrolled lateral spreading<\/li>\n\n\n\n<li>Hold reactive chemicals in the printed pattern<\/li>\n\n\n\n<li>Support uniform application before steaming or development<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0d514ed0\">The required grade should be process-specific.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1c27bcdf\">A CMS designed for disperse printing should not automatically be moved into vat or discharge printing because the chemical environment can be completely different.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-116c2b16\">A grade reference such as H5 is not, by itself, evidence of vat, discharge or burn-out suitability. These are different application claims and require current documentation plus separate process validation.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-bea70420\">The Main Chemical Stresses: Alkali, Reducing Agents and Electrolytes<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-235828e0\">The thickener may experience several stresses at the same time.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-d5828eca\">\u0995\u09cd\u09b7\u09be\u09b0\u0995<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-76bd2814\">The response to alkali depends on the documented polymer chemistry, grade and complete recipe. Measure the actual paste response instead of assigning one mechanism to the whole product range.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-9d2649b6\">Reducing Agents<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-98ae75bf\">Vat and discharge systems may use different reducing agents according to dye chemistry and process design.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-fc0dc632\">The thickener must remain sufficiently stable for the intended holding period while still allowing the reducing chemistry to function.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-ed319683\">\u0987\u09b2\u09c7\u0995\u09cd\u099f\u09cd\u09b0\u09cb\u09b2\u09be\u0987\u099f\u09b8\u09ae\u09c2\u09b9<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2133f8e1\">Alkali salts, reducing-agent salts and other auxiliaries increase ionic strength.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-44ce2189\">Depending on the identified grade and formulation, the changed ionic environment can affect:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u09aa\u09cd\u09b0\u09a4\u09c0\u09af\u09bc\u09ae\u09be\u09a8 \u09b8\u09be\u09a8\u09cd\u09a6\u09cd\u09b0\u09a4\u09be<\/li>\n\n\n\n<li>Paste body<\/li>\n\n\n\n<li>Flow under shear<\/li>\n\n\n\n<li>\u09b8\u09cd\u09a5\u09bf\u09a4\u09bf\u09b6\u09c0\u09b2\u09a4\u09be \u09ac\u099c\u09be\u09af\u09bc \u09b0\u09be\u0996\u09be<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-062c59ff\">Do not evaluate these variables independently only. After one-factor screening, test the full chemical package.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-33292c9e\">What to Test in a Vat Printing Paste<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b8fd388d\">For vat printing, the CMS qualification should include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u09b8\u09cd\u099f\u0995-\u09aa\u09c7\u09b8\u09cd\u099f \u09aa\u09cd\u09b0\u09b8\u09cd\u09a4\u09c1\u09a4\u09bf<\/li>\n\n\n\n<li>Viscosity after the full vat-printing formula is prepared<\/li>\n\n\n\n<li>Alkali tolerance<\/li>\n\n\n\n<li>Reducing-agent compatibility where present in the selected route<\/li>\n\n\n\n<li>\u09b8\u09cd\u09a5\u09bf\u09a4\u09bf\u09b6\u09c0\u09b2\u09a4\u09be \u09ac\u099c\u09be\u09af\u09bc \u09b0\u09be\u0996\u09be<\/li>\n\n\n\n<li>Screen transfer<\/li>\n\n\n\n<li>Pattern sharpness<\/li>\n\n\n\n<li>Drying behavior<\/li>\n\n\n\n<li>Steaming\/development<\/li>\n\n\n\n<li>Oxidation<\/li>\n\n\n\n<li>Soaping\/wash-off<\/li>\n\n\n\n<li>Final color strength and shade<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c114ff35\">In two-phase vat printing, the printed thickener layer can affect the later penetration and action of reducing and alkaline development chemicals.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ba5e5d00\">This is one reason the dried CMS film should be evaluated together with wet-paste rheology rather than judged from viscosity alone.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-6609ed41\">What to Test in a Discharge Printing Paste<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-faed9406\">For discharge printing, the thickener must hold the discharge chemicals precisely where the effect is required.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8c28d7ad\">\u09ae\u09c2\u09b2\u09cd\u09af\u09be\u09af\u09bc\u09a8 \u0995\u09b0\u09c1\u09a8:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Compatibility with the selected discharge agent<\/li>\n\n\n\n<li>Compatibility with alkali or acid components in that discharge system<\/li>\n\n\n\n<li>Paste stability during the realistic color-kitchen holding time<\/li>\n\n\n\n<li>\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09a8 \u099a\u09b2\u099b\u09c7<\/li>\n\n\n\n<li>Discharge edge sharpness<\/li>\n\n\n\n<li>Degree of ground-color removal<\/li>\n\n\n\n<li>Colored-discharge shade where relevant<\/li>\n\n\n\n<li>Post-steam washing<\/li>\n\n\n\n<li>Residual odor or chemical residue where relevant<\/li>\n\n\n\n<li>Fabric strength and hand<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8c5d8326\">Historic discharge-printing processes have used modified starches and cellulose-based thickeners in reducing\/alkaline pastes, which supports the general principle that the thickener must tolerate the chemical package. See <a href=\"https:\/\/patents.google.com\/patent\/US4631067A\/en\">an example of a discharge print paste using modified starch\/cellulose thickening systems<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f392b898\">However, historic recipe levels should not be copied as modern production specifications. The actual discharge chemistry must be supplied by the mill or dye\/auxiliary supplier.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-b786fdd8\">Why Stock Viscosity Is Not Enough<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f434bf4e\">A CMS TDS may list viscosity at a defined concentration and temperature.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6b8eb82c\">That value is useful for incoming QC.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e435baae\">But the vat or discharge paste can contain much higher ionic and chemical loading than the standard water test.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ecdcd131\">The meaningful sequence is:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3a2c137e\"><strong>CMS Stock Paste \u2192 Add Full Chemical Package \u2192 Measure Again \u2192 Hold \u2192 Measure Again \u2192 Print<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b4a20053\">\u09b0\u09c7\u0995\u09b0\u09cd\u09a1:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CMS concentration<\/li>\n\n\n\n<li>Water quality<\/li>\n\n\n\n<li>\u09a4\u09be\u09aa\u09ae\u09be\u09a4\u09cd\u09b0\u09be<\/li>\n\n\n\n<li>Viscometer<\/li>\n\n\n\n<li>Spindle\/rotor<\/li>\n\n\n\n<li>RPM<\/li>\n\n\n\n<li>\u09aa\u09a1\u09bc\u09be\u09b0 \u09b8\u09ae\u09af\u09bc<\/li>\n\n\n\n<li>Holding time<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-84bbb9df\"><strong>Same stock viscosity does not mean the same chemical resistance.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-65883e65\">Paste Holding Stability Before Printing<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-005b4192\">Vat and discharge pastes can change while waiting before printing.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c9cecf60\">Possible changes include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Viscosity loss<\/li>\n\n\n\n<li>\u09b8\u09be\u09a8\u09cd\u09a6\u09cd\u09b0\u09a4\u09be \u09ac\u09c3\u09a6\u09cd\u09a7\u09bf<\/li>\n\n\n\n<li>Gel formation<\/li>\n\n\n\n<li>Phase separation<\/li>\n\n\n\n<li>Foaming<\/li>\n\n\n\n<li>Loss of discharge\/reducing activity<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9f79085d\">A useful holding test uses realistic time points:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Immediately after formula preparation<\/li>\n\n\n\n<li>After the normal waiting period<\/li>\n\n\n\n<li>Near the end of the planned production window<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-af72cb6a\">At each point, record both paste properties and printing effect.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-19e1c05c\">A paste can retain viscosity while the discharge chemistry loses activity, so viscosity stability alone is not enough.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-12bb2869\">Screen Running and Pattern Definition<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4dc0677d\">CMS must provide enough structure at rest while still flowing under printing shear.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d1491b3f\">\u09ae\u09c2\u09b2\u09cd\u09af\u09be\u09af\u09bc\u09a8 \u0995\u09b0\u09c1\u09a8:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Flat vs. rotary screen behavior<\/li>\n\n\n\n<li>\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09a8 \u09aa\u09cd\u09af\u09be\u09b8\u09c7\u099c<\/li>\n\n\n\n<li>Squeegee pressure<\/li>\n\n\n\n<li>\u09ab\u09c7\u09a8\u09be<\/li>\n\n\n\n<li>\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09a8 \u09b6\u09c1\u0995\u09be\u09a8\u09cb<\/li>\n\n\n\n<li>Pattern filling<\/li>\n\n\n\n<li>Edge definition<\/li>\n\n\n\n<li>\u09aa\u09cd\u09b0\u09ac\u09c7\u09b6<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a7e08502\">If the paste is too weak, discharge chemicals or vat dye can spread beyond the intended pattern.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-aa88b26a\">If it is too resistant to flow, screen transfer may become incomplete.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-61b44482\">\u0985\u09a4\u098f\u09ac:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-83e88214\"><strong>Higher viscosity is not automatically better pattern control.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-d5b7fa2c\">Drying, Steaming and Process Temperature<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-fc7a773a\">After printing, the paste usually enters a thermal stage.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-63a9a7da\">The exact process depends on the printing route.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-eb4fa170\">Temperature can change:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Moisture retention<\/li>\n\n\n\n<li>Chemical mobility<\/li>\n\n\n\n<li>Reducing-agent activity<\/li>\n\n\n\n<li>Alkali transport<\/li>\n\n\n\n<li>Thickener-film structure<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4a7cc393\">Do not publish or copy one universal steaming temperature or time for all vat\/discharge systems.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a63cd33c\">Use the actual dye and auxiliary supplier process, then check whether CMS remains compatible with that thermal window.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-bcd93556\">Vat Dye Reduction, Development and Oxidation<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-736f0bf5\">The vat route depends on controlled reduction and later oxidation.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-24cb50c3\">CMS should not interfere with the transfer of reducing\/alkaline chemicals or create a dried film that prevents effective development.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8fa25b40\">After printing and development, evaluate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Color strength<\/li>\n\n\n\n<li>\u099b\u09be\u09af\u09bc\u09be<\/li>\n\n\n\n<li>Levelness<\/li>\n\n\n\n<li>\u09b8\u09c2\u0995\u09cd\u09b7\u09cd\u09ae \u09b0\u09c7\u0996\u09be \u09b8\u0982\u099c\u09cd\u099e\u09be<\/li>\n\n\n\n<li>\u09aa\u09cd\u09b0\u09ac\u09c7\u09b6<\/li>\n\n\n\n<li>Oxidation completeness<\/li>\n\n\n\n<li>Soaping cleanliness<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2c300b5e\">Research on vat printing shows that modified starch, alginate and other thickeners can behave differently through drying and chemical development, so the dried thickener morphology is part of the process, not just a passive carrier.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-9058d719\">Discharge Effect: What Should Be Measured?<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3eca185b\">A discharge trial should quantify more than \u201cit looks white.\u201d<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4b077580\">Useful observations include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ground-color removal<\/li>\n\n\n\n<li>Residual ground shade<\/li>\n\n\n\n<li>\u09a7\u09be\u09b0\u09c7\u09b0 \u09a4\u09c0\u0995\u09cd\u09b7\u09cd\u09a3\u09a4\u09be<\/li>\n\n\n\n<li>Haloing<\/li>\n\n\n\n<li>Fabric penetration<\/li>\n\n\n\n<li>Colored-discharge shade where used<\/li>\n\n\n\n<li>Uniformity across large areas<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-766cacdc\">Compare the same ground-dyed fabric and the same discharge chemistry when evaluating two CMS candidates.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ab569ec8\">If the CMS grade changes and the discharge depth changes, investigate both:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Chemical compatibility<\/li>\n\n\n\n<li>Paste deposit \/ penetration<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a031338c\">A stronger discharge effect is not useful if the pattern edge becomes unacceptable or the fabric is damaged.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-7b150c8d\">Wash-Off, Soaping and Residue Removal<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-280273a9\">Vat and discharge printing normally require substantial post-treatment.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-de458499\">The thickener should wash away sufficiently after the chemical process.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ab282374\">\u09ae\u09c2\u09b2\u09cd\u09af\u09be\u09af\u09bc\u09a8 \u0995\u09b0\u09c1\u09a8:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Residual paste<\/li>\n\n\n\n<li>Surface harshness<\/li>\n\n\n\n<li>\u09aa\u099f\u09ad\u09c2\u09ae\u09bf \u09b0\u0999\u09be\u09af\u09bc\u09a8<\/li>\n\n\n\n<li>Color redeposition<\/li>\n\n\n\n<li>\u0998\u09b0\u09cd\u09b7\u09a3 \u09b8\u09cd\u09a5\u09be\u09af\u09bc\u09bf\u09a4\u09cd\u09ac<\/li>\n\n\n\n<li>\u0995\u09be\u09aa\u09a1\u09bc\u09c7\u09b0 \u09b9\u09be\u09a4<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ba5af854\">A CMS grade that gives excellent screen behavior but requires excessive washing can increase:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Water use<\/li>\n\n\n\n<li>Energy<\/li>\n\n\n\n<li>Processing time<\/li>\n\n\n\n<li>Total cost<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-36dd44d4\">Final approval should therefore be made after the full washing sequence.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-a632a6f0\">Fabric and Ground-Dye Variables<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f15ac103\">Vat printing is used mainly on suitable cellulosic materials, while discharge printing can involve several fabric and ground-color systems.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-fa4335a2\">\u0997\u09c1\u09b0\u09c1\u09a4\u09cd\u09ac\u09aa\u09c2\u09b0\u09cd\u09a3 \u09ad\u09c7\u09b0\u09bf\u09af\u09bc\u09c7\u09ac\u09b2\u0997\u09c1\u09b2\u09bf\u09b0 \u09ae\u09a7\u09cd\u09af\u09c7 \u09b0\u09af\u09bc\u09c7\u099b\u09c7:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cotton vs. viscose<\/li>\n\n\n\n<li>Woven vs. knitted structure<\/li>\n\n\n\n<li>\u0995\u09be\u09aa\u09a1\u09bc\u09c7\u09b0 \u0993\u099c\u09a8<\/li>\n\n\n\n<li>Absorbency<\/li>\n\n\n\n<li>Ground-dye class<\/li>\n\n\n\n<li>Ground-dye depth<\/li>\n\n\n\n<li>Finishing history<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d8f8f719\">Not every ground dye is equally dischargeable.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d22ccc82\">If a discharge test is weak, do not blame CMS before confirming that the ground dye and discharge agent are chemically compatible.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-ba0de9fb\">Water Quality and Formula Variation<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a44728eb\">CMS behavior can change with water hardness, conductivity and dissolved multivalent ions.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e6c254f0\">Vat\/discharge formulas already contain significant ionic loading, so plant water can become an additional variable.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-15ef275f\">If laboratory results do not match production, compare:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reference water<\/li>\n\n\n\n<li>\u0997\u09be\u099b\u0995\u09c7 \u099c\u09b2 \u09a6\u09be\u0993<\/li>\n\n\n\n<li>Hardness<\/li>\n\n\n\n<li>\u09aa\u09b0\u09bf\u09ac\u09be\u09b9\u0995\u09a4\u09be<\/li>\n\n\n\n<li>\u09aa\u09bf\u098f\u0987\u099a<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d3124d3f\">Also confirm that production follows the same chemical addition order as the laboratory.<\/p>\n\n\n\n<h2>Test Paste Stability and Chemical Activity Separately<\/h2><p>The following is a proposed qualification design. Confirm the candidate grade and the dye or auxiliary supplier&#8217;s process before testing; it does not establish that any named FSX grade has already passed.<\/p><table><thead><tr><th>Control or trial<\/th><th>\u09aa\u09cd\u09b0\u09b8\u09cd\u09a4\u09c1\u09a4\u09bf<\/th><th>Purpose<\/th><\/tr><\/thead><tbody><tr><td>Candidate stock paste<\/td><td>Defined concentration, water, hydration and measurement method<\/td><td>Reference physical behavior before process chemicals<\/td><\/tr><tr><td>Candidate complete paste<\/td><td>Actual supported chemical package, final mass and addition sequence<\/td><td>Combined physical and chemical response<\/td><\/tr><tr><td>Approved production thickener<\/td><td>Matched chemical levels, fabric and process, with its documented recipe<\/td><td>Practical performance reference<\/td><\/tr><tr><td>Chemical-package control where the assay permits<\/td><td>Same chemical concentrations and aging conditions without thickener<\/td><td>Help investigate loss of chemical activity independently of paste flow<\/td><\/tr><\/tbody><\/table><h3>Keep aging and sampling comparable<\/h3><p>Record vessel, exposure conditions, temperature and elapsed time from preparation. Check fresh paste, the normal waiting period and the intended end of use. Measure viscosity, pH and physical defects separately from the chemical activity assessment. Apply a chemical assay only if it is appropriate for the reducing or discharge agent and the matrix; a viscosity result cannot establish retained reducing-agent concentration.<\/p><p>If oxidation-reduction potential is monitored, record the electrode system, temperature and measurement procedure. Treat it as a method-dependent process indicator, not a universal assay of reducer concentration or proof of discharge performance.<\/p><h3>Verify the actual color process<\/h3><p>For vat printing, complete the specified development, oxidation and washing route. For discharge, use a known, documented ground-dyed fabric and distinguish white from colored discharge. Compare ground-color removal, any retained colorant, edge definition and fabric condition after the full finishing sequence. A weak result on an unsuitable ground dye cannot establish that the thickener failed.<\/p><p>Approve only the tested grade\u2013recipe\u2013fabric\u2013process combination. Retaining viscosity while losing chemical activity is a failure of the complete process; retaining chemical activity while losing printable rheology is also insufficient.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-7c9fbe46\">How to Run a Controlled Printing Trial<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2c197f24\">Use one fabric lot and keep the dye\/chemical system constant.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-89276e6c\">Print a diagnostic pattern containing:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fine lines<\/li>\n\n\n\n<li>Small text<\/li>\n\n\n\n<li>Solid blocks<\/li>\n\n\n\n<li>Half-tone or gradient areas where relevant<\/li>\n\n\n\n<li>Large discharge areas<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2df6b387\">Then use identical:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u09b6\u09c1\u0995\u09be\u09a8\u09cb<\/li>\n\n\n\n<li>Steaming\/development<\/li>\n\n\n\n<li>Oxidation where relevant<\/li>\n\n\n\n<li>\u09a7\u09cb\u09af\u09bc\u09be<\/li>\n\n\n\n<li>Soaping<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6c801356\">\u09ae\u09c2\u09b2\u09cd\u09af\u09be\u09af\u09bc\u09a8 \u0995\u09b0\u09c1\u09a8:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u09a8\u0995\u09b6\u09be\u09b0 \u09b8\u0982\u099c\u09cd\u099e\u09be<\/li>\n\n\n\n<li>Vat color yield or discharge depth<\/li>\n\n\n\n<li>\u099b\u09be\u09af\u09bc\u09be<\/li>\n\n\n\n<li>\u09aa\u09cd\u09b0\u09ac\u09c7\u09b6<\/li>\n\n\n\n<li>\u09a6\u09c3\u09a2\u09bc\u09a4\u09be<\/li>\n\n\n\n<li>Residue<\/li>\n\n\n\n<li>\u09b9\u09be\u09a4<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-924023a0\">Production Approval Checklist<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-04003677\">Before bulk approval, verify:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Large-batch CMS hydration<\/li>\n\n\n\n<li>Full formula viscosity<\/li>\n\n\n\n<li>Holding-time stability<\/li>\n\n\n\n<li>Screen running over realistic production length<\/li>\n\n\n\n<li>Left-center-right pattern consistency<\/li>\n\n\n\n<li>Thermal process repeatability<\/li>\n\n\n\n<li>Vat development or discharge depth<\/li>\n\n\n\n<li>Post-treatment cleanliness<\/li>\n\n\n\n<li>Fabric strength and hand<\/li>\n\n\n\n<li>Repeat-batch CMS consistency<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2128bdfb\">Retain the final approved:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CMS batch<\/li>\n\n\n\n<li>Printing formula version<\/li>\n\n\n\n<li>Fabric lot<\/li>\n\n\n\n<li>Ground-dye information for discharge<\/li>\n\n\n\n<li>Machine settings<\/li>\n\n\n\n<li>Steaming\/development record<\/li>\n\n\n\n<li>Finished fabric reference<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b81f626b\">This creates a practical production standard rather than relying on memory.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-fd79a4b1\">\u09a4\u09cd\u09b0\u09c1\u099f\u09bf \u09b8\u09ae\u09be\u09a7\u09be\u09a8 \u09b8\u09be\u09b0\u09a3\u09bf<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u09aa\u09b0\u09cd\u09af\u09ac\u09c7\u0995\u09cd\u09b7\u09bf\u09a4 \u09b8\u09ae\u09b8\u09cd\u09af\u09be<\/th><th>\u09aa\u09cd\u09b0\u09a5\u09ae\u09c7 \u09af\u09be\u099a\u09be\u0987 \u0995\u09b0\u09be\u09b0 \u09ad\u09c7\u09b0\u09bf\u09af\u09bc\u09c7\u09ac\u09b2\u09b8\u09ae\u09c2\u09b9<\/th><th>\u0985\u09a8\u09c1\u09ae\u09be\u09a8 \u0995\u09b0\u09ac\u09c7\u09a8 \u09a8\u09be<\/th><\/tr><\/thead><tbody><tr><td>Viscosity collapses after alkali\/reducer addition<\/td><td>CMS grade, chemical concentration, ionic load, addition order<\/td><td>Stock viscosity predicts chemical resistance<\/td><\/tr><tr><td>Paste viscosity is stable but discharge is weak<\/td><td>Discharge agent activity, ground dye, steaming, penetration<\/td><td>CMS is automatically the cause<\/td><\/tr><tr><td>Discharge is strong but edges spread<\/td><td>Paste rheology, deposit, screen settings<\/td><td>More discharge agent is the solution<\/td><\/tr><tr><td>Vat shade is weak after development<\/td><td>Reduction, alkali, steaming, thickener-film effect<\/td><td>More dye alone will solve it<\/td><\/tr><tr><td>Paste works fresh but fails after waiting<\/td><td>Holding stability, reducer life, pH, temperature<\/td><td>Viscosity is the only aging variable<\/td><\/tr><tr><td>Residue remains after washing<\/td><td>CMS dosage, post-treatment, film formation, process temperature<\/td><td>Good printing automatically means good wash-off<\/td><\/tr><tr><td>Lab result passes but production fails<\/td><td>Batch scale, water, machine shear, steam uniformity, chemical addition<\/td><td>The laboratory sample proves production approval<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-d08abd1a\">\u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0\u09c7 \u09ae\u09cb\u099f \u0996\u09b0\u099a<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-5615cf50\">A vat\/discharge thickener should not be selected from price per kilogram alone.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ede4f20d\">\u09a4\u09c1\u09b2\u09a8\u09be \u0995\u09b0\u09c1\u09a8:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CMS dosage<\/li>\n\n\n\n<li>Paste preparation time<\/li>\n\n\n\n<li>Chemical stability<\/li>\n\n\n\n<li>Screen interruptions<\/li>\n\n\n\n<li>Discharge\/vat effect<\/li>\n\n\n\n<li>Steam\/development efficiency<\/li>\n\n\n\n<li>Washing and soaping load<\/li>\n\n\n\n<li>\u09aa\u09c1\u09a8\u09b0\u09cd\u09a8\u09bf\u09b0\u09cd\u09ae\u09be\u09a3<\/li>\n\n\n\n<li>\u09ac\u09be\u09a4\u09bf\u09b2 \u0995\u09b0\u09be \u0995\u09be\u09aa\u09a1\u09bc<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-821d5a7b\">\u098f\u0995\u099f\u09bf \u0989\u09aa\u0995\u09be\u09b0\u09c0 \u0995\u09be\u09a0\u09be\u09ae\u09cb \u09b9\u09b2\u09cb:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-995ef2bf\"><strong>Total cost per accepted metre = attributable material, preparation, machine-time, finishing and quality-loss costs divided by accepted metres<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a7048f21\">A grade with higher powder cost may still be commercially better if it uses a lower dosage and maintains stability through the full production window.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-714c787b\">What Information Should You Send to a CMS Supplier?<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3c0285ea\">For vat or discharge CMS matching, send:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Printing route: vat or discharge<\/li>\n\n\n\n<li>\u09ac\u09b8\u09cd\u09a4\u09cd\u09b0\u09c7\u09b0 \u0997\u09a0\u09a8 \u0993 \u09a8\u09bf\u09b0\u09cd\u09ae\u09be\u09a3<\/li>\n\n\n\n<li>Ground-dye class and shade depth for discharge<\/li>\n\n\n\n<li>Current thickener sample\/TDS<\/li>\n\n\n\n<li>\u09ac\u09b0\u09cd\u09a4\u09ae\u09be\u09a8 \u0998\u09a8\u0995\u09be\u09b0\u09c0 \u09a1\u09cb\u099c<\/li>\n\n\n\n<li>Target viscosity and full test method<\/li>\n\n\n\n<li>\u0995\u09cd\u09b7\u09be\u09b0\u09c0\u09af\u09bc \u09a7\u09b0\u09a8 \u098f\u09ac\u0982 \u09ae\u09be\u09a4\u09cd\u09b0\u09be<\/li>\n\n\n\n<li>Reducing\/discharge agent type and dosage<\/li>\n\n\n\n<li>\u09b8\u09ae\u09cd\u09aa\u09c2\u09b0\u09cd\u09a3 \u09ac\u09be \u09b8\u09b0\u09b2\u09c0\u0995\u09c3\u09a4 \u09b8\u09c2\u09a4\u09cd\u09b0<\/li>\n\n\n\n<li>Paste holding time<\/li>\n\n\n\n<li>\u09b8\u09ae\u09a4\u09b2 \u09ac\u09be \u0998\u09c2\u09b0\u09cd\u09a3\u09be\u09af\u09bc\u09ae\u09be\u09a8 \u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09a8<\/li>\n\n\n\n<li>Drying and steaming\/development conditions<\/li>\n\n\n\n<li>Oxidation\/soaping\/washing route<\/li>\n\n\n\n<li>Current stability, pattern, discharge, color or residue problem<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b8ac402a\">FSX \u0995\u09c7\u09ae\u09bf\u0995\u09cd\u09af\u09be\u09b2 \u098f\u0987 \u09a4\u09a5\u09cd\u09af\u099f\u09bf \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09a4\u09c7 \u09aa\u09be\u09b0\u09c7 \u09ae\u09be\u09a7\u09cd\u09af\u09ae\u09c7 <a href=\"https:\/\/fsxchemical.com\/bn\/%e0%a6%b8%e0%a7%87%e0%a6%ac%e0%a6%be\/%e0%a6%ae%e0%a6%bf%e0%a6%b2%e0%a6%bf%e0%a6%a4-%e0%a6%a8%e0%a6%ae%e0%a7%81%e0%a6%a8%e0%a6%be\/\">\u09a8\u09ae\u09c1\u09a8\u09be \u0993 \u09ae\u09bf\u09b2\u093e\u0928<\/a> to review a documented candidate grade for a controlled trial. A trial recommendation is not production approval.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-a850665c\">How Should CMS Be Approved for Vat and Discharge Printing?<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-376f8e74\">A practical qualification chain is:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-50057aa4\"><strong>CMS Stock Paste \u2192 Full Chemical Formula \u2192 Holding Stability \u2192 Screen Printing \u2192 Drying \u2192 Vat\/Discharge Development \u2192 Washing\/Soaping \u2192 Finished Fabric \u2192 Production Repeatability<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7355ff78\">\u09ae\u09c2\u09b2 \u09a8\u09c0\u09a4\u09bf\u0997\u09c1\u09b2\u09bf \u09b9\u09b2:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Vat and discharge printing require separate qualification.<\/strong><\/li>\n\n\n\n<li><strong>Stock-paste viscosity does not prove alkali or reducing-agent tolerance.<\/strong><\/li>\n\n\n\n<li><strong>Paste holding stability and chemical activity must both be monitored.<\/strong><\/li>\n\n\n\n<li><strong>Screen performance must be judged together with pattern development.<\/strong><\/li>\n\n\n\n<li><strong>Final approval should be made after steaming\/development and full washing.<\/strong><\/li>\n\n\n\n<li><strong>The complete formula, fabric and process\u2014not the CMS name alone\u2014determine suitability.<\/strong><\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-de4d604c\">\u09aa\u09cd\u09b0\u09be\u09af\u09bc\u09b6\u0987 \u099c\u09bf\u099c\u09cd\u099e\u09be\u09b8\u09bf\u09a4 \u09aa\u09cd\u09b0\u09b6\u09cd\u09a8\u09be\u09ac\u09b2\u09c0<\/h2>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-ff9bf4a3\">1. Can CMS be used for vat dye printing?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0bd6377d\">Selected CMS grades can be evaluated for vat printing when they maintain useful rheology under the actual alkaline\/reducing process and do not interfere with development, oxidation and wash-off.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-9d9c0144\">2. Can CMS be used for discharge printing?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3c68c70b\">Selected CMS or modified-starch grades can be evaluated for discharge printing, but compatibility with the actual discharge agent, ground dye, fabric and steaming process must be confirmed.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-dcd5c49b\">3. Is the same CMS grade suitable for both vat and discharge printing?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e96e9abc\">Not automatically. The chemical systems and quality targets differ, so each route should be approved separately.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-208195db\">4. What is the most important CMS test for vat printing?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-92dfad1b\">There is no single test. Evaluate full-formula viscosity, holding stability, screen running, vat development, oxidation, wash-off and final color.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-aac30708\">5. What is the most important CMS test for discharge printing?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ff5bd403\">Evaluate chemical compatibility, holding stability, screen definition, degree of discharge, edge sharpness and final washing result.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-b6f92a2b\">6. Does high CMS viscosity mean good alkali resistance?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0748fd72\">No. Stock viscosity and chemical resistance are different properties. Test the full alkaline formula.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-7efb5e04\">7. Can a CMS paste remain viscous but still fail in discharge printing?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-bce6c6a8\">Yes. The discharge agent may lose activity or fail to penetrate\/develop correctly even if viscosity remains stable.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-aefb3a91\">8. Why does discharge paste lose viscosity after preparation?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0e1c571f\">Possible causes include electrolyte loading, pH, reducing-agent chemistry, addition order, temperature or unsuitable CMS grade.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-bbb726a4\">9. Why is the discharge effect good but the pattern edge poor?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ba8a7a1f\">The chemistry may be active while paste rheology or screen-transfer conditions allow excessive spreading.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-abc5f2d0\">10. Should production approval be based on a laboratory viscosity target?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2908a45b\">No. The CMS should be approved through the complete vat\/discharge process and finished-fabric result.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-b6c87e28\">11. Is H5 automatically suitable for every vat\/discharge mill?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-514cf6a5\">No. Confirm the current H5 technical documentation and recommended application first. Any candidate still needs separate validation with the actual fabric, chemicals, machine and post-treatment.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-f7181cf9\">12. What should I send FSX Chemical for vat\/discharge matching?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-87dff97b\">Send the current thickener, formula, fabric, ground dye where relevant, alkali\/reducing agent, viscosity method, screen route, steaming\/development and washing conditions.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-0838b888\">Evaluate CMS for Vat and Discharge Printing with FSX Chemical<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-81b61933\">If your current vat or discharge thickener loses viscosity after chemical addition, runs poorly through the screen, gives weak discharge, reduces vat color development or leaves difficult residue, FSX Chemical can help structure a controlled comparison.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2534b4ee\">\u098f\u0995\u099f\u09bf \u0995\u09be\u09b0\u09cd\u09af\u0995\u09b0 \u09aa\u09cd\u09b0\u09af\u09c1\u0995\u09cd\u09a4\u09bf\u0997\u09a4 \u09aa\u09b0\u09cd\u09af\u09be\u09b2\u09cb\u099a\u09a8\u09be\u09b0 \u099c\u09a8\u09cd\u09af \u09aa\u09be\u09a0\u09be\u09a8:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Your current thickener sample, TDS or COA<\/li>\n\n\n\n<li>Vat or discharge printing route<\/li>\n\n\n\n<li>\u09ac\u09b8\u09cd\u09a4\u09cd\u09b0\u09c7\u09b0 \u0997\u09a0\u09a8 \u0993 \u09a8\u09bf\u09b0\u09cd\u09ae\u09be\u09a3<\/li>\n\n\n\n<li>Ground dye and shade depth for discharge<\/li>\n\n\n\n<li>\u09ac\u09b0\u09cd\u09a4\u09ae\u09be\u09a8 \u0998\u09a8\u0995\u09be\u09b0\u09c0 \u09a1\u09cb\u099c<\/li>\n\n\n\n<li>\u09b8\u09be\u09a8\u09cd\u09a6\u09cd\u09b0\u09a4\u09be \u098f\u09ac\u0982 \u09b8\u09ae\u09cd\u09aa\u09c2\u09b0\u09cd\u09a3 \u09aa\u09b0\u09c0\u0995\u09cd\u09b7\u09a3 \u09aa\u09a6\u09cd\u09a7\u09a4\u09bf<\/li>\n\n\n\n<li>Alkali and reducing\/discharge agents<\/li>\n\n\n\n<li>Complete or simplified printing formula<\/li>\n\n\n\n<li>Paste holding time<\/li>\n\n\n\n<li>Flat\/rotary screen information<\/li>\n\n\n\n<li>Drying and steaming\/development conditions<\/li>\n\n\n\n<li>Oxidation and washing\/soaping route<\/li>\n\n\n\n<li>Current viscosity, pattern, discharge, color or residue target<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1c1c1d5e\">\u09a6\u09bf\u09af\u09bc\u09c7 \u09b6\u09c1\u09b0\u09c1 \u0995\u09b0\u09c1\u09a8 <a href=\"https:\/\/fsxchemical.com\/bn\/%e0%a6%b8%e0%a7%87%e0%a6%ac%e0%a6%be\/%e0%a6%ae%e0%a6%bf%e0%a6%b2%e0%a6%bf%e0%a6%a4-%e0%a6%a8%e0%a6%ae%e0%a7%81%e0%a6%a8%e0%a6%be\/\">\u09a8\u09ae\u09c1\u09a8\u09be \u0993 \u09ae\u09bf\u09b2\u093e\u0928<\/a> for a controlled comparison.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6b8df283\">\u09aa\u09b0\u09cd\u09af\u09be\u09b2\u09cb\u099a\u09a8\u09be <a href=\"https:\/\/fsxchemical.com\/bn\/%e0%a6%aa%e0%a6%a3%e0%a7%8d%e0%a6%af\/%e0%a6%95%e0%a6%be%e0%a6%b0%e0%a7%8d%e0%a6%ac%e0%a6%95%e0%a7%8d%e0%a6%b8%e0%a6%bf%e0%a6%ae%e0%a6%bf%e0%a6%a5%e0%a6%be%e0%a6%87%e0%a6%b2-%e0%a6%b8%e0%a7%8d%e0%a6%9f%e0%a6%be%e0%a6%b0%e0%a7%8d%e0%a6%9a\/\">FSX Chemical CMS product range<\/a> and request current grade-specific application documentation.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b17f14dd\">\u0986\u09aa\u09a8\u09bf\u0993 \u0995\u09b0\u09a4\u09c7 \u09aa\u09be\u09b0\u09c7\u09a8 <a href=\"https:\/\/fsxchemical.com\/bn\/%e0%a6%b8%e0%a7%87%e0%a6%ac%e0%a6%be\/%e0%a6%ae%e0%a7%82%e0%a6%b2%e0%a7%8d%e0%a6%af-%e0%a6%9c%e0%a6%be%e0%a6%a8%e0%a6%a4%e0%a7%87-%e0%a6%85%e0%a6%a8%e0%a7%81%e0%a6%b0%e0%a7%8b%e0%a6%a7-%e0%a6%95%e0%a6%b0%e0%a7%81%e0%a6%a8\/\">\u0995\u09be\u09b0\u0996\u09be\u09a8\u09be-\u09b8\u09b0\u09be\u09b8\u09b0\u09bf \u09ae\u09c2\u09b2\u09cd\u09af \u0989\u09a6\u09cd\u09a7\u09c3\u09a4\u09bf \u0985\u09a8\u09c1\u09b0\u09cb\u09a7 \u0995\u09b0\u09c1\u09a8<\/a> after the suitable process route is confirmed or <a href=\"https:\/\/fsxchemical.com\/bn\/%e0%a6%86%e0%a6%ae%e0%a6%be%e0%a6%a6%e0%a7%87%e0%a6%b0-%e0%a6%b8%e0%a6%be%e0%a6%a5%e0%a7%87-%e0%a6%af%e0%a7%8b%e0%a6%97%e0%a6%be%e0%a6%af%e0%a7%8b%e0%a6%97-%e0%a6%95%e0%a6%b0%e0%a7%81%e0%a6%a8\/\">\u098f\u09ab\u098f\u09b8\u098f\u0995\u09cd\u09b8 \u0995\u09c7\u09ae\u09bf\u0995\u09cd\u09af\u09be\u09b2\u09c7\u09b0 \u09b8\u09be\u09a5\u09c7 \u09af\u09cb\u0997\u09be\u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8<\/a> \u09aa\u09cd\u09b0\u09af\u09c1\u0995\u09cd\u09a4\u09bf\u0997\u09a4 \u0986\u09b2\u09cb\u099a\u09a8\u09be \u099c\u09a8\u09cd\u09af\ud83d\udce7\u00a0<strong>\u0987\u09ae\u09c7\u0987\u09b2<a href=\"https:\/\/fsxchemical.com\/bn\/%e0%a6%86%e0%a6%ae%e0%a6%be%e0%a6%a6%e0%a7%87%e0%a6%b0-%e0%a6%b8%e0%a6%be%e0%a6%a5%e0%a7%87-%e0%a6%af%e0%a7%8b%e0%a6%97%e0%a6%be%e0%a6%af%e0%a7%8b%e0%a6%97-%e0%a6%95%e0%a6%b0%e0%a7%81%e0%a6%a8\/\">: Service@fsxchemical.com<\/a><\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8a2ab8c6\"><strong>For vat and discharge printing, production approval should answer two separate questions: does the CMS keep the paste printable under aggressive chemistry, and does the complete chemical process still deliver the required color or discharge effect after steaming and washing?<\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>CMS for vat and discharge printing should be approved through the complete chemical process\u2014not from stock viscosity alone. Alkali, reducing agents, electrolytes, holding time, screen running, development and washing must all be validated.<\/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":"CMS for Vat and Discharge Printing: Qualification Tests","_seopress_titles_desc":"Qualify a documented CMS grade with separate paste-stability, chemical-activity and finished-print tests for vat and discharge production.","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","footnotes":""},"categories":[1],"tags":[1489,1208,1207,1491,1492,1126,1369,1490],"class_list":["post-10981","post","type-post","status-publish","format-standard","hentry","category-technical-guides","tag-alkali-stability","tag-carboxymethyl-starch","tag-cms","tag-discharge-printing","tag-reducing-agent","tag-screen-printing","tag-textile-thickener","tag-vat-printing"],"acf":[],"_links":{"self":[{"href":"https:\/\/fsxchemical.com\/bn\/wp-json\/wp\/v2\/posts\/10981","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fsxchemical.com\/bn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fsxchemical.com\/bn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fsxchemical.com\/bn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fsxchemical.com\/bn\/wp-json\/wp\/v2\/comments?post=10981"}],"version-history":[{"count":4,"href":"https:\/\/fsxchemical.com\/bn\/wp-json\/wp\/v2\/posts\/10981\/revisions"}],"predecessor-version":[{"id":11791,"href":"https:\/\/fsxchemical.com\/bn\/wp-json\/wp\/v2\/posts\/10981\/revisions\/11791"}],"wp:attachment":[{"href":"https:\/\/fsxchemical.com\/bn\/wp-json\/wp\/v2\/media?parent=10981"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fsxchemical.com\/bn\/wp-json\/wp\/v2\/categories?post=10981"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fsxchemical.com\/bn\/wp-json\/wp\/v2\/tags?post=10981"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}