Fiber Furnish Calculator

Design a paper fiber blend from softwood kraft, hardwood kraft, mechanical, and recycled pulp. Predict strength, formation, opacity, freeness, and fiber cost.

Inputs

Softwood kraft (%)

Hardwood kraft (%)

Mechanical pulp (%)

Recycled fiber (%)

Target paper GSM

Tab to move between fields

Results

Tensile index (0-100)

Tear index (0-100)64

Burst index (0-100)67.6

Formation (0-100)69

Opacity index (0-100)53.5

Freeness (CSF ml)500

Fiber cost ($/ton)$610

Total input (%)100

Dry Fiber Per (sq m)0.08

How to Use This Calculator

Enter the percentage of each fiber type — softwood kraft, hardwood kraft, mechanical, and recycled (values are auto-normalized to 100%).
Input your target paper weight in GSM.
Review predicted strength indices: Tensile Index, Tear Index, Burst Index.
Check Formation Index and Opacity Index to assess printability.
Use Freeness (CSF ml) and Fiber Cost per Ton to optimize drainage and economics.

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