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| Doctor Blade Systems |
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Doctor Blade Recommendations |
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| Machine Section |
Recommended Blades/Remarks |
Angle/Load Pressure |
| Forming Section |
 Fiberglass/Excellent blade life, roll cleaning performance.
Poly/Used on soft rolls, normally good life due to water. |
20°/0.5-0.7 pli |
| Press |
Granite/Synthetic/Ceramic
Fiberglass/Improved wear resistance over metal blades, mild polishing.
Carbon Fiber/Best performance for enhanced blade and roll life.
Stainless/Less commonly used in recent years, but still acceptable for some rolls. |
25°-30°/1.0-2.0 pli |
Soft Rolls
Polyethylene/Over 10-15 P&J rubber and polyurethane rolls, good when lubricated. |
| Dryers |
Fiberglass/Improved blade life, reduced roll scoring over metal blades.
Carbon Fiber/Longest wearing, high flex resistance, excellent cleaning.
Metal/Steel, stainless, bronze. Still used by some mills.
Abrasive/For periodic build-up removal. Only on oscillating doctors. |
30°/1.0-2.0 pli |
| Calenders |
Fiberglass/Excellent cleaning, improved blade and roll life.
Carbon Fiber/Maximum blade life. Recommend oscillation.
Metal/Steel, stainless or bronze. |
30°/1.0-2.0 pli |
| Reels |
Fiberglass/Longer life than metal blades. Reduced roll scoring.
Carbon Fiber/Greatest blade life.
Metal/Steel and bronze commonly used. |
30°/1.0-2.0 pli |
| Other Applications |
Contact PPA to discuss special situations (creping, printing, converting,non-paper related) |
Varies |
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