Drying section and method for drying a material web in such a drying section
AssigneeVoith Sulzer Papiertechnik Patent GmbH
InventorsGerhard Kotitschke, Markus Oechsle
Life of this patent
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Abstract
Drying section of a machine for producing a material web, such as a paper or cardboard web, comprises at least one drying group having at least one drying cylinder and at least one web guidance device around which the material web is guided in a meandering manner. The shrinkage gradient that occurs in the material web transversely with respect to the direction in which the web travels is set or controlled by providing at least one, and preferably several, areas in which an at least mostly free, unhindered shrinkage of the material web is possible.
Claims39
A method of drying a material web in a drying section of a machine for producing a material web, the drying section comprising at least one drying group having at least one drying cylinder and at least one web guidance device around which the material web is guided in a meandering manner;
- the method comprising providing at least one area in which the material web is allowed substantially free unhindered shrinkage such that the shrinkage gradient that occurs in the material web transversely with respect to the direction in which the web travels is controlled.
The method of claim I, wherein an essentially flat shrinkage gradient occurs when viewed transversely with respect to the direction in which the web travels.
A drying section of a machine for producing a material web, having at least one drying group that comprises at least one drying cylinder and at least one web guidance device, around which the material web is guided in a meandering manner, and at least one area in which an at least mostly free, unhindered shrinkage of the material web is possible, so as to control the shrinkage gradient that occurs in the material web in the direction transverse with respect to the direction in which the web travels,
- wherein the material web is guided without contact around at least one web guidance device to provide an area in which an at least mainly free, unhindered shrinkage of the material web is possible.
A method of drying a material web in a drying section of a machine for producing a material web, said drying section comprising at least one drying group having at least one drying cylinder and at least one web guidance device, the method comprising:
- introducing said material web to be dried into the drying section and passing said web around said web guidance device;
- and
- introducing said material web into an area downstream from said web guidance device, and allowing said material web to undergo drying in said area downstream from said web guidance device, under conditions wherein contact between said web and said web guidance device is reduced.
A drying section of a machine for producing a material web, having at least one drying group comprising at least one drying cylinder and at least one web guidance device around which the material web is guided in a meandering manner;
- an area downstream from said web guidance device in which said web is subjected to drying without substantial contact with a roll or guidance device, so as to control a shrinkage gradient that occurs in the material web in the direction transverse with respect to the direction in which the material web travels,
- wherein the material web is guided without contact around at least one web guidance device to provide an area in which an at least mainly free, unhindered shrinkage of the material web is possible.
Dependencies are inferred from the claim text.