Method and device for producing or treating a web of fibrous material
AssigneeVoith Patent GmbH
InventorJulia Spengler
Life of this patent
Estimating the term…
Abstract
A process for the production or treatment of a fibrous web, in particular a paper or cardboard web, includes the following steps: a. drying of the fibrous web in a dryer section; b. subsequent cooling of at least one first side of the fibrous web by way of convection cooling, whereby the fibrous web has a temperature of 65° C. or less on at least the first side after cooling, in particular 50° C. and less; c. apply steam to at least the first side of the fibrous web, in particular the temperature on the first side after steam application is at least 70° C., optionally more than 80° C. or 90° C.; and d. treatment of the fibrous web in at least one calendering nip.
Claims20
A method for producing or treating a web of fibrous material, the method comprising the steps of:
- drying the web of fibrous material in a drying section;
- subsequently cooling at least a first side of the web of fibrous material by way of convection cooling, the web of fibrous material after cooling having a temperature of 65° C. or less on at least the first side;
- applying steam onto the at least one first side of the web of fibrous material, the temperature after applying steam being at least 70° C.;
- and
- treating the web of fibrous material in a single calendering nip, the calendering nip including a heated roll and a counter element, and a distance between an end of applying steam and the calendering nip being not greater than 1 m, the web of fibrous material running at a speed of between 600 m/min and 1600 m/min.
A device for producing or treating of a web of fibrous material, the device comprising:
- a drying section configured for drying the web of fibrous material;
- a calender having a single calendering nip configured for treating the web of fibrous material, the calendaring nip including a heated roll and a counter element, the device being configured for treating the web of fibrous material at a speed of between 600 m/min and 1600 m/min;
- a steam blow box positioned—when viewed in a direction of travel of the web of fibrous material—upstream from the calender, the steam blow box being configured for applying steam to a first side of the web of fibrous material;
- and
- a convection cooling device positioned between the drying section and the steam blow box, the convection cooling device being configured for cooling at least the first side of the web of fibrous material by way of convection to a temperature of 65° C. or less.
Dependencies are inferred from the claim text.