Dryer section
AssigneeVoith Paper Patent GmbH
InventorsRoland Mayer, Markus Oechsle, Antje Stein, Frank Wegehaupt
Life of this patent
Estimating the term…
Abstract
Dryer section for drying a fibrous web supported by at least one drying fabric. The dryer section includes a plurality of heated drying cylinders, a plurality of guide rolls, and a plurality of dampening devices arranged at different locations relative to the fibrous web. Each dampening device applies a quantity of liquid to the fibrous web. In at least in one of the plurality of dampening devices, the quantity of the liquid is adjustable separately in zones transversely with respect to a web running direction. This Abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way.
Claims37
A dryer section for drying a fibrous web supported by at least one drying fabric, the dryer section comprising:
- a plurality of heated drying cylinders;
- a plurality of guide rolls;
- a plurality of dampening devices arranged at different locations relative to the fibrous web;
- at least one of the guide rolls being an evacuated guide roll;
- one of the dampening devices being arranged in a region of the evacuated guide roll;
- and
- each dampening device applying a quantity of liquid to the fibrous web,
- wherein, in at least in one of the plurality of dampening devices, the quantity of the liquid is adjustable separately in zones transversely with respect to a web running direction, and
- wherein a first one of the plurality of dampening devices has more zones than a second one of the plurality of dampening devices.
A method treating a fibrous web using a dryer section for drying a fibrous web supported by at least one drying fabric and comprising a plurality of heated drying cylinders, a plurality of guide rolls, a plurality of dampening devices arranged at different locations relative to the fibrous web, at least one of the guide rolls being an evacuated guide roll, one of the dampening devices being arranged in a region of the evacuated guide roll, and each dampening device applying a quantity of substances to the fibrous web wherein, in at least in one of the plurality of dampening devices, the quantity of the substances is adjustable separately in zones transversely with respect to a web running direction, the method comprising:
- applying the substances to one side of the fibrous web in order to influence surface properties of the fibrous web,
- wherein a first one of the plurality of dampening devices has more zones than a second one of the plurality of dampening devices.
A dryer section for drying a fibrous web supported by at least one drying fabric, the dryer section comprising:
- a plurality of drying groups each comprising a plurality of heated drying cylinders and a plurality of guide rolls;
- the plurality of guide rolls comprising first and second evacuated guide rolls;
- a first dampening device applying a quantity of liquid to the fibrous web in a region of the first evacuated guide roll;
- and
- a second dampening device applying a quantity of liquid to the fibrous web in a region of the second evacuated guide roll,
- wherein, in at least in one of the first and second dampening devices, the quantity of the liquid is adjustable separately in zones transversely with respect to a web running direction, and
- wherein the first dampening device has more zones than the second dampening device.
A dryer section for drying a fibrous web supported by at least one drying fabric, the dryer section comprising:
- a plurality of heated drying cylinders;
- a plurality of guide rolls;
- a plurality of dampening devices arranged at different locations relative to the fibrous web;
- at least one of the guide rolls being an evacuated guide roll;
- one of the dampening devices being arranged in a wrap region of the evacuated guide roll;
- and
- each dampening device applying a quantity of liquid to the fibrous web,
- wherein, in at least in one of the plurality of dampening devices, the quantity of the liquid is adjustable separately in zones transversely with respect to a web running direction,
- wherein a last one of the plurality of dampening devices is at least one of:
- configured to substantially correct a tendency of the fibrous web to curl;
- adjusted to substantially correct a tendency of the fibrous web to curl;
- configured to exclusively correct a tendency of the fibrous web to curl;
- and
- adjusted to exclusively correct a tendency of the fibrous web to curl, and
- wherein a first of the dampening devices is arranged in an area of the dryer section wherein the web has a dryness of at least 60%.
A dryer section for drying a fibrous web supported by at least one drying fabric, the dryer section comprising:
- a plurality of heated drying cylinders;
- a plurality of guide rolls;
- a plurality of dampening devices arranged at different locations relative to the fibrous web;
- at least one of the guide rolls being an evacuated guide roll;
- one of the dampening devices being arranged in a wrap region of the evacuated guide roll;
- and
- each dampening device applying a quantity of liquid to the fibrous web,
- wherein, in at least in one of the plurality of dampening devices, the quantity of the liquid is adjustable separately in zones transversely with respect to a web running direction, and
- wherein a last one of the plurality of dampening devices is at least one of:
- configured to substantially correct a tendency of the fibrous web to curl;
- adjusted to substantially correct a tendency of the fibrous web to curl;
- configured to exclusively correct a tendency of the fibrous web to curl;
- and
- adjusted to exclusively correct a tendency of the fibrous web to curl,
- wherein a first one of the plurality of dampening devices has more zones than a last one of the plurality of dampening devices.
Dependencies are inferred from the claim text.