Coater for selectively coating a running web either on one side or on both sides
AssigneeValmet Paper Machinery Inc.
InventorsDan Eklund, Markku Grasten
Life of this patent
Estimating the term…
Abstract
In a device for alternatively one- or double-sided coating of a running paper web the final evening-out of the coating is made in a smoothing nip including a first roll and a counter member. The device includes means for leading the web from below upwards into the smoothing nip. At a considerable distance before the smoothing nip, there is a coating substance applicator including an applicator chamber, where the coating substance is brought into a substantially non-pressurized contact with the running web for adhering thereto and travelling therewith upwards to the smoothing nip. The web moves linearly from the applicator to the smoothing nip.
Claims14
A device for coating at least one side of a running paper web, comprising:
- a roll having a central axis,
- means supporting the roll for rotation about its central axis,
- a counter piece which cooperates with the roll to define a smoothing nip,
- a coating substance applicator disposed below the smoothing nip and spaced therefrom along a linear path of movement of the web, said applicator comprising
- means defining an applicator chamber at one side of said path of movement, and means for feeding coating substance to the applicator chamber to form therein a body of coating substance in substantially non-pressurized contact over a contact distance of at least 5 cm with one side of a web passing upwardly along said path to the smoothing nip, said means defining the applicator chamber being spaced from the path of movement of the web, allowing the coating substance to contact the web in substantially non-pressurized manner and also allowing the web to run through the applicator substantially without any mechanical contact with the applicator, and
- means defining a collecting space below said applicator and said smoothing nip for collecting excess coating substance and leading it to a recycling system.
A device according to claim 20, wherein said space is between 0.2 and 1 mm.
Dependencies are inferred from the claim text.