APPLICATION 01
Carboxymethyl Starch for Discharge Printing
Discharge printing puts the thickener paste under additional stress the paste must stay stable through the discharge and steaming stage hold the print outline and wash out cleanly afterwards When evaluating carboxymethyl starch for this process share the fabric discharge system recipe required powder or flake form and target viscosity KARN will use this information to arrange sample and TDS confirmation no grade is pre assigned on this page
How to evaluate carboxymethyl starch for discharge printing
For discharge printing evaluate CMS against three paste requirements stability through the discharge and steaming stage sharp print outlines and clean wash off afterwards Prepare a trial with the actual fabric and recipe record whether powder or flake is required and the target viscosity or test method then compare candidate grades on the same print run Grades K5 K6 or K9 differ in raw material DS level and confirmed viscosity range the final grade and form require a representative sample and the current TDS
Process suitability
- Record the discharge agent and steaming conditions
- Check paste stability and outline sharpness on the trial print
- Confirm wash off behaviour before production
CMS grades available for confirmation
Listing does not confirm suitability for this process Validate the grade with a sample and the current TDS
Continue the CMS procurement evaluation
Discharge evaluation information to send
- Candidate K6 K5 K9 grade or grade not yet selected
- Raw material DS and sample or batch reference
- Powder or flake form
- Representative fabric and fibre composition
- Ground shade dye class and whether the dye is dischargeable
- Anti reduction pre treatment state
- White discharge or coloured discharge intent and the illuminating colour if used
- Relevant discharge paste recipe context for reducing agent alkali humectant and CMS loading including actual amounts where disclosure is possible
- Target paste viscosity and the measured CMS result with its method
- Paste preparation water mixing hydration and measurement conditions
- Actual printing drying and steaming conditions including temperature time air exclusion and steam quality
- Oxidation washing hot wash and finishing conditions
- Current observations for outline halo paste stability colour yield and wash off
- Acceptance criteria and the procurement decision the trial must support
Independent discharge printing process context
This Cotton Incorporated technical bulletin explains vat dye chemistry and vat discharge printing on cotton It is background context and does not test KARN grades or prove suitability for a specific production recipe
- Print Chemistry of Vat Dyes and Vat DischargeCotton Incorporated Technical Bulletin ISP 1016 Copyright 2006Read the Cotton Incorporated PDF
The bulletin connects a dischargeable ground shade and anti reduction preparation with halos and outline sharpness It describes a discharge paste containing a reducing system alkali humectant and thickener then fixation in air free steam followed by oxidation and washing These are process context points and not a universal KARN CMS recipe
What the source does not establish
The bulletin covers vat discharge examples on cotton and does not test KARN CMS It does not establish that K5 K6 or K9 suits a specific discharge process or production recipe Keep the actual buyer fabric dye recipe and machine conditions on the trial record instead of treating a literature example as a KARN protocol