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US 6,280,576 B1Granted
After-dryer in a paper machine
AssigneeValmet Corporation
InventorsAntti Kuhasalo, Pasi Ahonen
Life of this patent
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AssigneeValmet Corporation
InventorsAntti Kuhasalo, Pasi Ahonen
Estimating the term…
A method and arrangement for drying a paper to be surface-treated, in particular fine paper, in an after-dryer in a paper machine. The paper web is first dried in a forward dryer section of the paper machine by one or more groups with single-wire draw that are open downward on support of a drying wire, the paper web is then finished in a finishing section, e.g., surface-sized or coated, and thereafter, the paper web is dried by an upwardly open inverted group with single-wire draw. In the inverted group with single-wire draw, the tendency of curling formed in the paper web in the forward dryer section can be substantially eliminated and/or compensated for. In the alternative, to eliminate or compensate for the tendency of curling formed in the paper web in the forward dryer section, hot moist air may be fed into certain locations into connection with the dryer groups in an after-dryer in order to restrain the evaporation, or hot dry air may be fed in order to promote the evaporation from the side of the web that is desirable in view of the control of curling.
A paper machine comprising a plurality of drying cylinders for drying a web, said plurality of drying cylinders being arranged before a finishing section and each and every one of said drying cylinders being arranged along only one side of the web, a finishing section arranged immediately after the plurality of drying cylinders in a running direction of the web and in which the web is surface-sized or coated, the web having a tendency of curling as a result of the arrangement of said drying cylinders along only one side of the web prior to said finishing section, and an after-dryer for drying the web after the web passes through the finishing section comprising
A paper machine comprising a plurality of drying cylinders for drying a web, said plurality of drying cylinders being arranged before a finishing section and each and every one of said drying cylinders being arranged along only one side of the web, a finishing section arranged immediately after the plurality of drying cylinders in a running direction of the web and in which the web is surface-sized or coated, the web having a tendency of curling as a result the arrangement of said drying cylinders along only one side of the web prior to said finishing section, and an after-dryer for drying the web after the web passes through the finishing section comprising
A paper machine comprising a plurality of drying cylinders for drying a web, said plurality of drying cylinders being arranged before a finishing section and each and every one of said drying cylinders being arranged along only one side of the web, a finishing section arranged immediately after the forward dryer section in a running direction of the web and in which the web is surface-sized or coated, the web having a tendency of curling as a result of the arrangement of said drying cylinders along only one side of the web prior to said finishing section, and an after-dryer for drying the web after the web passes through the finishing section comprising
Dependencies are inferred from the claim text.