Method for minimizing tension variation in a paper web...

Drying and gas or vapor contact with solids – Process – Gas or vapor contact with treated material

Reexamination Certificate

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C162S198000, C162S204000, C162SDIG006

Reexamination Certificate

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06860033

ABSTRACT:
Tension variations in the paper web on a paper machine are caused by successive draws and moisture fluctuations. Good strength properties require optimization of the draws. In addition, the tension variation induced by moisture must be minimized. The analysis of local modulus and the strain components can be used for determining optimal locations for profiling actuators in order to achieve good tension profile. Longitudinal strain components of the web, i.e. reversible elastic strain, permanent plastic strain and frozen-in strain relievable with water are continuously measured and determined and the variation of said longitudinal components is minimized by correcting the moisture content of the paper web in a dryer section of the paper machine and/or by optimizing the draws between dryer groups in the dryer section.

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