Importance

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Abstract

A process and device for increasing the gloss and/or smoothness of a web of material are described, whereby a web of material (5) is passed through a roller gap where it is exposed to pressure. A steam dispensing device (7) is provided upstream of the roller gap relative to the direction of travel (9) of the web of material (5). The increase in gloss and/or smoothness is to be accomplished without consuming much energy. To do so, the steam is condensed on the web of material and the web of material (5) is guided through the roller gap before the increase in moisture content of the surface due to the steam treatment has dropped below a predetermined value. The predetermined moisture content is in the range of 12% to 25%. For this purpose, the steam dispensing device (7) has a steam blasting chamber (13) which is completely surrounded by a free housing wall (14) with a number of steam outlet openings (20) and other chamber walls (15-19) and it has a steam valve (21) for injecting steam into the steam blasting chamber (13), in which case at least one wall of the steam blasting chamber (13), preferably the free housing wall (14), is heated.

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First Claim