Enter any three values (nip line load, nip width ratio, material thickness, and average/adjusted nip pressure) into the calculator below to compute the missing value.
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Nip Load (Line Load) Formula
The following example problem outlines the steps and information needed to calculate the nip load (more precisely, the nip line load: force per unit roll length).
NL = P \cdot NW \cdot t
Variables:
- NL is the nip line load (force per unit roll length), e.g., N/mm (equivalently kN/m)
- P is the average/adjusted nip pressure, e.g., N/mm² (or Pa, bar, psi)
- NW is the nip width ratio (dimensionless), commonly defined as (nip/contact width) ÷ (material thickness)
- t is the material thickness (a length), e.g., mm, cm, m, in
To calculate the nip line load, multiply the average/adjusted nip pressure by the nip width, where nip width = (nip width ratio) × (material thickness).
How to Calculate Nip Load?
The following steps outline how to calculate the nip load (line load).
- Determine the nip width ratio (NW).
- Measure the material thickness (t) and determine/estimate the average/adjusted nip pressure (P).
- Use the formula NL = P · NW · t.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
nip width ratio (NW) = 2
material thickness (t) = 0.5 mm
average/adjusted nip pressure (P) = 1 N/mm²
NL = P · NW · t = 1 · 2 · 0.5 = 1 N/mm
