Sizing

Sow Box Squeeze Roll Nip Pressure to Wet Pick-Up Calculator

The size box wets the warp; the squeeze rolls decide how much stays. Pick-up is a pressure setting, not a recipe line.

Squeeze Rolls Pneumatics
bar
mm
no.
mm
Calibration From mill trials
%
N/mm

Fitted to your own squeeze roll and warp; not universal.

%

Wet Pick-Up

— %

Liquor retained on the warp after the nip

Nip Mechanics

Nip Line Load
— N/mm
Total Nip Force
— N
Force per Cylinder
— N
Cylinder Piston Area
— mm²
Size Add-on
— %

The exponent and reference point must be fitted on your own machine — squeeze roll hardness, warp sett and liquor temperature all move the curve, and an unfitted exponent will be wrong by more than the pressure adjustment you are trying to make. Rising pressure lowers pick-up but also drives size onto the surface rather than into the yarn; check penetration as well as add-on.

Sow Box Squeeze Roll Nip Pressure to Wet Pick-Up Calculator — free, with the formula and a worked example, at Textile School.