Dry section

Gentle and effective drying

When the paper is pressed, a dry content of approx. 55 % can be achieved. The remaining moisture is removed by a steam-heated cylinder in the dry section of the paper machine. Heat transfer to the paper is carried out through direct contact with the outer wall of the cylinder. The drying process uses thermal energy from the steam, which causes a condensate film to form on the inside wall of the cylinder. This water film affects the heat transfer to the paper and it must therefore be continuously removed via a syphon system.

Pressure measurement with VEGABAR 52

The right amount of heat transfer from the drying cylinder to the paper is monitored via pressure measurement with VEGABAR 52 respectively at the inlet and at the outlet. This separated measurement is a particularly economic solution because it saves the installation of differential pressure pipes. VEGABAR 52 delivers exact individual pressure values to the control system and ensures the required operational reliability through the highly overload resistant CERTEC® measuring cell, even when pressure surges occur in the pipeline. An alternative is the classic differential pressure measurement with VEGADIF 65 via differential pressure pipes and valve manifolds.

» VEGABAR 52

Measuring cell	CERTEC

Measuring range	-1 … +72 bar

Permanent product temperature	-40 … +150 °C

Deviation in characteristics	0.2 %, 0.1 %, 0.075%

SIL qualification	up to SIL2

» VEGADIF 65

Measuring ranges	from -10 … +10 mbar up to -40 … +40 bar

Process fittings	¼-18 NPT, RC ¼

Process temperature	-40 … +120 °C