Method of drying a cardboard or a paper web and drying device for applying this method
AssigneeOy Tampella AB
InventorJukka A. Lehtinen
Life of this patent
Estimating the term…
Abstract
A method of drying a cardboard or a paper web by passing the wet web supported by a drying band between two moving, nonpermeable surface elements having good heat conducting properties. The surface element contacting the web is subjected to heating and the surface element contacting the drying band is subjected to cooling. Due to the heating of the web the water contained therein is caused to evaporate and the evaporated water is caused to condense into the drying band due to the cooling of the drying band. The water is removed from the drying band after the web and the drying band have left the surface elements and have been separated from each other.
Claims15
A method of drying a moving wet web of cardboard of paper comprising aupporting said web on a moving, drying band, contacting said web with a moving, heated drying surface in order to evaporate water from said web and into said drying band, and simultaneously contacting said drying band with a moving, cooling surface to condensed water received and contained by said drying band, removing the condensed water from said drying band and separating a dried web of cardboard or paper from the drying band.
An apparatus for drying a moving wet web of cardboard or paper comprising at least one pair of surfaces formed by first and second endless, nonpermeable, movable bands capable of conducting heat, means for passing said bands in parallel over at least part of their path of movement and in the same direction on opposite sides of said web to be dried, a drying band supporting said web, said first band contacting said wet web, said second band contacting said drying band, and means for heating said first band and means for cooling said second band during parallel movement of said web and all of said bands in a forward direction.
Dependencies are inferred from the claim text.