sci.paper-freeness-Schopper-Riegler Calculator
Calculates Schopper-Riegler (°SR) freeness from drainage time and converts to Canadian Standard Freeness (CSF) for pulp processing. Higher °SR = slower draining (more refined) pulp — newsprint uses 30–40 °SR; packaging grades 60–70 °SR; tissue 15–20 °SR.
Inputs
- Sr Degrees
- Reference formula or conversion factor shown for context.
- Grammage G M2
- Age in completed years. Many health and fitness formulas adjust for age.
- Web Speed M Min
- Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Results
- Schopper-Riegler freeness (°SR)
- Sample size or count used in the calculation.
- approx Canadian Standard Freeness (mL)
- Sample size or count used in the calculation.
- estimated drainage time factor
- A dimensionless multiplier applied in the calculation.
- machine production rate (t/hr, 1m trim)
- The result of multiplying all input values together.
- °SR scale
- Reference formula or conversion factor shown for context.
- fibre classification
- Category assigned based on where the computed value falls on a defined scale. Check which standard or guideline defines these boundaries.
paper canadian approx riegler freeness