{"id":4409,"date":"2026-07-31T16:49:45","date_gmt":"2026-07-31T16:49:45","guid":{"rendered":"https:\/\/fsxchemical.com\/?p=4409"},"modified":"2026-10-25T04:32:30","modified_gmt":"2026-10-25T04:32:30","slug":"guide-de-selection-et-dapplication-du-cmc-pour-les-encres-dimprimerie","status":"publish","type":"post","link":"https:\/\/fsxchemical.com\/fr\/blog\/cmc-for-printing-ink-grade-selection-and-application-guide\/","title":{"rendered":"CMC for Water-Based Printing Inks: Grade Selection and Compatibility Testing"},"content":{"rendered":"

Direct answer:<\/strong> CMC<\/a> can be evaluated as a rheology modifier or stabilizer in selected water-based flexographic and gravure formulations and in some substrate or textile pretreatments. It should not be assumed suitable for every resin, pigment or electrolyte system, and it should not be added to a printhead ink unless the ink formulator has validated purity, molecular weight, viscosity, filtration and nozzle reliability.<\/p>\n\n\n\n

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R\u00f4le du CMC dans les formulations d'encres d'imprimerie<\/a><\/h2>\n\n\n\n

Son r\u00f4le en tant qu'\u00e9paississant et modificateur de rh\u00e9ologie<\/h3>\n\n\n\n

In a suitable water-based formulation, CMC can modify viscosity and transfer. R\u00e9duction de la viscosit\u00e9 sous cisaillement<\/a> means lower apparent viscosity at a higher shear rate; it does not demonstrate time-dependent recovery after printing. Measure the flow response and, where relevant, recovery after a defined shear step using the same rest time, temperature and measurement sequence. Confirm transfer and film quality on the actual press.<\/p>\n\n\n\n

A change in low-shear viscosity can affect settling behavior, but adding CMC does not by itself prove pigment dispersion stability. Compare the complete ink for sedimentation, flocculation, viscosity drift, filter residue and redispersibility over the intended storage conditions.<\/p>\n\n\n\n

Compatibilit\u00e9 avec les syst\u00e8mes d'encre \u00e0 base d'eau<\/a><\/h3>\n\n\n\n

CMC may be compatible with selected water-based acrylic, styrene-acrylic or water-soluble resin systems, but compatibility is formulation-specific. Resin charge, surfactants, pigments, salts, pH, biocide and shear history can change viscosity, stability and film performance, so the complete ink or coating must be tested.<\/p>\n\n\n\n

Il n'est g\u00e9n\u00e9ralement pas utilis\u00e9 dans les syst\u00e8mes d'encre \u00e0 base de solvant ou \u00e0 s\u00e9chage UV, qui n\u00e9cessitent d'autres modificateurs de rh\u00e9ologie. Si votre production fait appel \u00e0 plusieurs types d'encre, v\u00e9rifiez la compatibilit\u00e9 du CMC avec chaque syst\u00e8me avant d'opter pour une seule qualit\u00e9.<\/p>\n\n\n\n

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CMC Application Route and Qualification Risk<\/h2>\n\n\n\n
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Application route<\/th>CMC starting position<\/th>Critical qualification checks<\/th><\/tr><\/thead>
Water-based flexographic ink<\/td>Possible formulation-specific rheology modifier<\/td>Binder and pigment compatibility, anilox transfer, foam, drying and final film<\/td><\/tr>\n
Water-based gravure ink<\/td>Only low-residue grades that maintain the required low viscosity<\/td>Filtration, cell release, transfer stability, drying and print definition<\/td><\/tr>\n
Textile or paper inkjet pretreatment<\/td>Possible component in the substrate coating or padding bath<\/td>Application pickup, drying, ink holdout, color, hand feel and storage stability<\/td><\/tr>\n
Direct printhead ink<\/td>Do not add without ink-formulator validation<\/td>Purity, molecular weight, viscosity, microfiltration, jetting and long-run nozzle reliability<\/td><\/tr>\n
Solvent-based or UV-curable ink<\/td>Generally not the preferred starting route<\/td>Use a rheology modifier designed for the actual solvent or radiation-curing chemistry<\/td><\/tr>\n
Textile screen or rotary printing paste<\/td>Separate application with different grade requirements<\/td>Dye or pigment compatibility, rheology, screen passage, fixation and wash-off<\/td><\/tr>\n<\/tbody><\/table><\/figure>\n\n\n\n

Applications du CMC par proc\u00e9d\u00e9 d'impression<\/a><\/h2>\n\n\n\n

Water-Based Flexographic Ink and Related Systems<\/a><\/h3>\n\n\n\n

In selected water-based flexographic formulations, CMC may be evaluated to adjust low-shear body and support transfer stability on paper, board or suitable films. Suitability depends on the binder, pigment dispersion, anilox volume, drying conditions and target press viscosity.<\/p>\n\n\n\n

Do not select a grade or dosage from a generic viscosity label. Begin with the ink formulator’s target viscosity and solids balance, then screen low-residue candidate grades at controlled additions while monitoring flow, foam, filtration, transfer, drying and film properties.<\/p>\n\n\n\n

Impression h\u00e9liographique : exigences en mati\u00e8re de stabilit\u00e9 de la viscosit\u00e9<\/a><\/h3>\n\n\n\n

In water-based gravure printing, control ink viscosity and solids as the formulation circulates and transfers from engraved cells. Record ink temperature and any approved water or ingredient replenishment. Evaporation and process additions can change the composition, so a viscosity change should not automatically be attributed to the CMC grade.<\/p>\n\n\n\n

Le CMC peut contribuer \u00e0 la stabilit\u00e9 de la viscosit\u00e9 dans les formulations d'encres d'h\u00e9liogravure \u00e0 base d'eau. Cependant, il convient de choisir soigneusement la qualit\u00e9 du produit : un CMC \u00e0 haute viscosit\u00e9, m\u00eame \u00e0 de faibles concentrations, peut rendre l'encre d'h\u00e9liogravure trop \u00e9paisse pour permettre le d\u00e9moulage des cellules. Des qualit\u00e9s \u00e0 viscosit\u00e9 faible \u00e0 moyenne, utilis\u00e9es \u00e0 des concentrations contr\u00f4l\u00e9es avec pr\u00e9cision, sont plus adapt\u00e9es \u00e0 cette application.<\/p>\n\n\n\n

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Inkjet Pretreatment: Match Grade to Application Method<\/a><\/h3>\n\n\n\n

Dans l'impression num\u00e9rique \u00e0 jet d'encre sur textiles ou papier, le CMC est utilis\u00e9 dans le rev\u00eatement de pr\u00e9traitement appliqu\u00e9 sur le support avant l'impression, et non dans l'encre elle-m\u00eame. Le pr\u00e9traitement permet d'am\u00e9liorer l'adh\u00e9rence de l'encre, de r\u00e9duire l'\u00e9talement et d'optimiser la d\u00e9finition des couleurs \u00e0 la surface du support.<\/p>\n\n\n\n

For a substrate pretreatment, choose the CMC grade and working concentration against the actual padding, spray or coating equipment and target deposit. Test hydration, filtration, application uniformity, drying and finished-print quality. There is no universal low-viscosity grade or dosage that qualifies every pretreatment route.<\/p>\n\n\n\n

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Param\u00e8tres cl\u00e9s de la note \u00e0 pr\u00e9ciser<\/h2>\n\n\n\n

Degr\u00e9 de substitution (DS)<\/a><\/h3>\n\n\n\n

DS is the average number of carboxymethyl groups per anhydroglucose unit in CMC. Request the grade-specific value or range and the test method. Select the grade through complete-formulation testing rather than applying one generic DS range to all printing inks.<\/p>\n\n\n\n

DS alone does not establish hydration, filtration or ink compatibility. Preparation conditions and the particular commercial grade also matter. Compare dissolution and retained material under a documented water, concentration, feeding, mixing and hydration procedure; do not infer pass or failure from a single DS cutoff.<\/p>\n\n\n\n

Plage de viscosit\u00e9<\/h3>\n\n\n\n

La viscosit\u00e9 doit \u00eatre adapt\u00e9e au type d'encre et au proc\u00e9d\u00e9 d'impression. \u00c0 titre indicatif :<\/a><\/p>\n\n\n\n