Specific Edge Load (SEL) Calculator

SEL is the refining intensity that decides whether a disc refiner develops fiber or cuts it. This calculator applies the standard definition SEL = P_net / CEL, where CEL = (rotor bars + stator bars) × effective bar length × rpm.

Net (effective) refining power P_net — kW
(motor load minus no-load)

Rotor bar count
(per full circle)

Stator bar count
(per full circle)

Effective bar length — m

Rotor speed — rpm

Furnish
(for intensity-band check)

Cutting Edge Length (CEL): km/s

Specific Edge Load (SEL): Ws/m

Reference intensity bands (net SEL, Ws/m)

Furnish	Recommended SEL
Softwood kraft	1.0–3.0
Hardwood / eucalyptus	0.1–0.6
Recycled / OCC	0.2–0.8
TMP / groundwood	0.2–0.5

Bands converge across UBC fibrelab, NC State BioResources and AFT FineBar guidance. Running above the band is where fiber cutting dominates. For an exact plate-pattern recommendation on your furnish, request a quotation from Henan Zejiang Paper Machinery.

Specific Edge Load (SEL) Calculator