Preserve the current state
Record grade, furnish, speed, chemistry, feeder outputs, white water, retention, drainage and paper defects.
Avoid changing several additives before a baseline is captured.
Verify product and batch
Check product code, lot, packaging condition and receiving record against the approved identity.
Confirm that no unqualified substitution occurred.
Inspect solution preparation
Review dilution water, concentration, feeder calibration, wetting, aging, deposits, tank turnover and solution age.
Incomplete hydration can look like low product activity.
Check dosing hardware
Confirm pump output, pulsation, blocked lines, calibration, dilution flow and injection quill condition.
Use a measured drawdown or flow verification when possible.
Review furnish and charge
Compare fines, filler, broke, conductivity, pH, cationic demand and contaminant sources with the accepted baseline.
Process change may be the real cause.
Trace addition and shear
Confirm injection point, mixing, contact time and approach-flow equipment status.
A screen, pump or flow change can alter floc survival.
Run a controlled check
Repeat blank, incumbent or retained reference tests with representative stock and active addition.
Change one cause at a time.
Close the corrective record
Document root cause, verified correction, restored metrics and any new control limit.
Retain the record for future lot and process comparisons.
Machine-trial interpretation and release record
A useful paper-machine decision record connects the product question to a defined furnish and grade. Record fiber mix, fines, filler, broke, pH, conductivity, temperature, charge demand and the complete wet-end additive sequence. Identify the current limitation and the measurement that will decide the trial. This context prevents a visually attractive laboratory result from being mistaken for a production-ready recommendation.
Compare a blank, the current program and coded candidates at equal active addition. Keep stock consistency, dilution water, polymer aging, addition order, mixing energy and elapsed time consistent. Measure the relevant combination of total and ash retention, drainage, white-water solids, formation and sheet properties. Repetition matters when furnish variability is large, and an apparent improvement should remain visible against the reference before scale-up.
The machine review should trace polymer from make-down to the headbox or selected sheet-strength addition point. Note feeder calibration, stock concentration, aging, dilution, injection hardware, contact time, fan-pump and screen shear. A chemistry that works only under gentle beaker mixing may not survive the approach-flow path. Conversely, poor wetting or a blocked dosing line can make a suitable grade appear ineffective.
Approve an operating window, not a universal dose. State the furnish, paper grade, test methods and acceptable balance among retention, drainage, formation, runnability and finished-paper quality. Link the approved sample code to its quotation, COA, SDS, packaging and receiving checks. Revalidate after meaningful changes in furnish, filler, wet-end chemistry, addition point, machine speed or supplied product identity.
Plan the machine trial before the sample arrives. Define baseline duration, sampling points, laboratory methods, operator observations, stabilization time and stop conditions. Hold other additives steady when practical, and document every unavoidable process change. Review white water, press behavior, deposits, broke and finished-paper tests beside the primary metric. A trial succeeds only when the total process and quality balance remains acceptable, not when one retention or drainage reading briefly reaches a peak.
Close the work with a release sheet that production, quality and purchasing can all use. Include the accepted product code, active addition range, preparation recipe, addition point, monitored signals and corrective actions. Add the representative furnish window and approval date. This lets later lots be checked against the same evidence and prevents a result from being separated from the conditions that created it.