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Preliminary Suggestions
| Typical indicators / objective observations | Likely direct causes | Low-cost actions to try first | When you should introduce / re-select PAM | Why PAM is recommended here |
|---|---|---|---|---|
| Persistently high white water turbidity | Insufficient fines capture; charge imbalance; wrong retention window | Stabilize charge control; review addition point and mixing; check saveall operation | When recovery and short circulation stability are key KPIs | PAM improves aggregation of fines/fillers for better capture and clearer white water |
| Recovery unstable after furnish/grade changes | System charge demand shifts; broke variability; additive interactions | Standardize furnish transitions; review additive sequence | When variability is frequent and costly | Grade matching provides a wider operating window under changing conditions |
| Deposits increase while turbidity remains high | Soft flocs and unstable chemistry; stickies interaction | Review deposit control strategy; avoid overdosing; verify screening efficiency | When both clarity and runnability are impacted | Optimized PAM reduces suspended solids and stabilizes the wet-end environment |
Applicability boundary: Best for systems where suspended solids drive turbidity. If the main issue is dissolved color or chemical foaming rather than solids, address those root causes first and then optimize clarification.
Selection guidance: how to choose the right PAM for this papermaking scenario
Molecular weight (MW): retention strength vs. formation risk
Higher MW can increase bridging and retention of fines/fillers, but excessive floc size may harm formation and sheet uniformity. The best MW window depends on machine shear in approach flow and your target balance (retention vs. formation vs. drainage).
Charge density (cationicity): wet-end is a charge-controlled system
Charge density governs how PAM interacts with negatively charged fibers, fines, and fillers. Too low may underperform; too high or overdosing may create soft flocs, deposit tendency, or drainage swings. A practical program keeps the system in a stable charge window.
Cationic vs anionic vs nonionic: selecting the ionic type
For wet-end retention and drainage improvement, cationic PAM is commonly used as a retention/filter aid. Anionic or nonionic grades may be relevant in specific sub-systems (for example, certain coating or dispersion control tasks) depending on the chemistry regime.
Emulsion vs powder: choosing by control and response speed
Powder grades can be economical for stable operations with disciplined solution preparation. Emulsion grades can be preferred when fast response and more automated dosing are required. Choose based on your make-down capability, staffing, and control needs.
Initial recommendation
Starting point: Start with a cationic retention/clarification approach and verify improvement in two metrics: white water turbidity reduction and fiber/filler recovery increase, without harming formation.
Contact us for a precise grade recommendation
A precise recommendation requires real wet-end data. Please submit the form and include the items below (ranges/estimates are acceptable if exact values are unavailable). We also welcome complex or rare cases.
- White water turbidity range and target: Defines success criteria and helps size the required capture improvement.
- Saveall configuration and performance: Clarification performance depends on the capture device and feed conditions.
- Furnish/broke ratio variability: Explains why clarity changes day-to-day.
- Wet-end pH and conductivity: Shifts charge demand and polymer performance.
- Current additive sequence: Incompatibility often appears as turbidity spikes or deposits.
- Problem repeat probability: Guides robustness requirements for grade selection.
What you will receive: recommended PAM type/form, 2–3 candidate grade windows, an initial dosing range for a controlled trial, and step-by-step guidance for a practical machine-side validation.
