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US 7,691,232 B2Granted
Method and device for treating a paper or cardboard web
AssigneeVoith Paper Patent GmbH
InventorsRuediger Kurtz, Joerg Rheims
Life of this patent
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Abstract
A method and a device for treating a web, wherein the web is coated by a coating device. The coated web is calendered, and a steam application device applies steam to the coated web before the coated web is calendered. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.
Claims20
A process for treating a web, comprising:
- applying a coating to a web;
- applying steam to the coating while the coating on the web is uncalendered;
- calendering the uncalendered coating and web in a shoe calender, wherein the coated web is calendered in a wide nip of the shoe calender, and wherein the steam is applied 10 ms to 100 ms before the web enters into the wide nip;
- and
- producing a pressure gradient of a maximum of 2 MPa/mm in intake and discharge areas of the wide nip.
2 more elements
A device for treating a web comprising:
- a coating device;
- a shoe calender having a wide nip with an intake area and a discharge area and being structured and arranged to produce a pressure gradient of a maximum of 2 MPa/mm in the intake and the discharge areas of the wide nip;
- and
- a steam application device positioned between said coating device and said shoe calender to apply steam to an uncalendered coating on the web 10 ms to 100 ms before the web enters the wide nip,
- wherein the coated web is calendered in the wide nip of the shoe calender.
2 more elements
A device for treating a web comprising:
- a coating device;
- a shoe calender;
- a steam application device positioned between said coating device and said shoe calender to apply steam to an uncalendered coating on the web;
- a second coating device structured to coat an uncoated side of the web;
- a second shoe calender;
- and
- a second steam application device positioned between said second coating device and said second calender.
4 more elements
Dependencies are inferred from the claim text.