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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 |
|---|---|---|---|---|
| Filler retention low; ash fluctuates | Charge demand shifted; wrong MW/charge window; inadequate addition strategy | Stabilize charge control; review addition point; tighten dose control | When filler loss becomes a cost and quality driver | PAM improves bridging capture of filler and fines, stabilizing ash retention |
| Strength drops sharply | Excess filler interference; poor bonding; overflocculation affects formation | Optimize filler strategy; avoid excessive floc size; adjust program to maintain formation | When you must balance retention and strength | Correct selection controls floc size and improves retention efficiency without unnecessary overflocculation |
| White water becomes cloudy after filler increase | Insufficient capture; system instability | Review sequence and monitoring; stabilize furnish transitions | When short circulation stability is impacted | PAM improves capture and reduces suspended solids in white water |
Applicability boundary: Applicable when filler retention and stability are primary levers. If strength loss is dominated by fiber quality or refining changes, address furnish/refining first and then optimize retention.
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: Begin with a cationic retention aid baseline, then tune charge density for filler capture while selecting an MW window that preserves formation. Validate with ash retention, tensile/burst KPIs, and white water turbidity.
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.
- Target filler type and loading level: Different fillers behave differently; loading defines the capture challenge.
- Strength KPI (tensile/burst) and formation KPI: Prevents retention optimization from damaging product requirements.
- Wet-end pH and conductivity: Shifts charge control and retention response.
- Additive regime (starch, sizing, fixatives): Affects bonding and retention stability.
- Current ash retention and white water turbidity: Quantifies the problem and trial success.
- Problem repeat probability: Guides robustness needs across grade transitions.
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.
