Paper Strength Peaks at 40‑60°C Drying, Hornification Down
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- The study shows hornification is more complex than previously thought, with temperature, humidity, and fiber type all influencing the permanent loss of water‑absorption in paper.
- Drying at 40‑60°C creates a “dip zone” where structural changes are minimal and paper strength peaks, a pattern confirmed across multiple pulp types.
- Water removal—not heat alone—drives hornification; experiments separating high temperature from drying demonstrated heat has almost no effect on fiber structure.
- Hardwood pulp experiences stronger hornification than softwood pulp because its fibers swell more before drying, leading to greater collapse.
- Researchers identified a linear relationship between the degree of hornification and the loss of material strength, linking microscopic changes directly to paper strength.
- Paper industry can use these insights to optimize drying processes, reducing quality losses during production and recycling.
Why it matters: Paper manufacturers and recyclers can cut strength losses by targeting the 40‑60°C drying window, where water removal—not heat—minimizes hornification, especially for hardwood pulp. By fine‑tuning temperature and humidity, they can produce stronger, more durable paper and reduce waste in recycling streams.
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