Dasteck ChemicalsYantai Dasteck Chemicals Co., Ltd.
Direct answer
Without a proper record, a substitution trial cannot say clearly whether it worked. A usable trial report only has to answer four things: what the starting recipe was, which levels were tried, how each one performed, and whether it can be scaled up. The framework below can be used directly.
1. Conditions to fix before starting
| Item | Requirement |
|---|---|
| Machine and liquor ratio | Record the machine and liquor ratio; do not mix machines in one trial |
| Fabric | Same greige lot, with article number and weight recorded |
| Water | Record hardness or conductivity; use softened water if needed |
| Temperature and time | Keep constant across levels; change only the variable under test |
| Alkali | Fixed by the trial plan; never cut in proportion to the reducer |
2. Suggested trial levels
Use the hydrosulfite recipe as the control and set three or four substitution levels, for example:
For each level record the dose in both g/L and g/kg on fabric, plus pH, temperature, time and ORP where available.
3. Results to measure at every level
| Category | Figures |
|---|---|
| Effect | Whiteness, or colour yield as K/S, plus a* and b* |
| Quality | Wash and rub fastness, strength, hand (add elastic recovery where elastane is present) |
| Process | Actual dose, alkali consumption, heating time, total time |
| Cost | Chemical cost per tonne of fabric or per oven-dry tonne of pulp |
4. How to write the conclusion
1. Whether substitution is possible: which level met the target and which did not
2. Scale-up risk: what to watch if machine, liquor ratio or water changes
3. Next step: whether a pilot is needed and which conditions it must fix
4. Retention and attachments: sample photographs, COA and test data attached
5. Three commonly missed records
Sources
The framework follows standard laboratory and pilot-plant practice. Specific test methods must follow your own or the customer standard.