US 5,683,509 AGranted

Apparatus for applying a liquid or pasty medium onto a moving material web

AssigneeVoith Sulzer Papiermaschinen GmbH

InventorsHans-Peter Sollinger, Chrisian Schiel

Life of this patent

Estimating the term…

Loading patent…

Abstract

Several embodiments of an apparatus for applying a liquid or pasty medium e.g. a coating medium onto a moving material web of paper or board are disclosed. All embodiments include a first flexible endless loop belt having an inner surface that passes in contact with a sliding surface of a concave pressing shoe and an outer surface which contacts and moves a web through a press nip. In some embodiments, there is an opposing roll rotating along with the endless belt through the nip. Various devices can apply liquid or pasty medium onto the surface of the belt or the surface of the opposing roll. In an alternate apparatus, there are two counter rotating flexible endless belts which form the press nip between them through which the web is guided. The belts are pressed against each other by elongate guiding surfaces of respective pressing shoes inside the loops of the belts. These embodiments provide a longer length nip in the web travel direction to avoid film splitting during coating of the material web.

Claims31

Dependent claims

Apparatus for applying a liquid or pasty medium onto a moving material web including that of paper or board, the apparatus comprising:

a flexible endless loop belt having an inner surface within the loop of the belt and having an opposite outer surface;
means for moving the belt lengthwise;
a pressing shoe within the loop of the belt, the pressing shoe having a sliding surface positioned in contact with the inner surface of the belt;
an opposing roll rotatable in the opposite direction to the endless belt and having a cylindrical outer surface;
the shoe, the belt and the opposing roll being so placed that the outer surface of the roll forms a nip with the outer surface of the endless belt 1n the region of the sliding surface of the pressing shoe, so that the web is guided through the nip between the outer surface of the belt and the outer surface of the roll;
the sliding surface of the shoe being concavely curved in its cross sections extending perpendicular to the axis of the opposing roll with a contour generally adapted to the outer contour of the opposing roll to extend the length of the nip through which the web passes;
the shoe being operable for pressing the sliding surface in the direction toward the opposing roll;
and
a medium applicator for applying liquid or pasty medium onto at least one of the outer surface of the endless belt and the outer surface of the opposing roll at a position thereon for being carried into the nip for being applied to the surface of the web facing the respective one of the endless belt and the opposing roll to which the medium is applied.

6 more elements

Apparatus for applying a liquid or pasty medium onto a moving material web including that of paper or board, the apparatus comprising:

a first flexible endless loop belt having a first inner surface within the loop and an opposite outer surface;
means for moving the first belt lengthwise;
a first pressing shoe within the loop of the first belt, the first pressing shoe having a first sliding surface positioned such that the first inner surface of the first belt passes over the first sliding surface;
a second flexible endless loop belt, means for moving the second belt lengthwise in the opposite direction to movement of the first endless belt;
a second pressing shoe within the loop of the second belt, the second pressing shoe having a second sliding surface positioned such that the second inner surface of the second belt passes over the second sliding surface;
the second sliding surface of the second pressing shoe lying opposite the first sliding surface of the first pressing shoe such that the first and second sliding surfaces may be pressed toward one another by the respective first and second pressing shoes;
the first and second flexible belts and the first and second shoes being so placed that the outer surfaces of both of the first and second endless belts form a nip between them in the region of both sliding surfaces of the pressing shoes, through which nip the web is guided;
the sliding surfaces being adapted to one another in their contours to form an extended length nip between the flexible belts along the direction of movement of the web through the nip;
a medium applicator for applying liquid or pasty medium onto the outer surface of at least one of the endless belts for the endless belt to which the medium is applied to carry the medium into the nip for application to the surface of the web facing the belt to which the medium is applied.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/577,419Filed 22 Dec 1995
Priority: DE 44 46 308.123 Dec 1994
Granted: 4 Nov 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

D21H 23/54
By contacting paper with a device carrying the material: rubbing devices, e.g. brush, pad, felt
B05C 1/0826
Using a roller or other rotating member which contacts the work along a generating line: the work being a web or sheets
B05C 1/12
Using a roller or other rotating member which contacts the work along a generating line: the work being fed round the roller
B05C 1/14
For applying liquid or other fluent material to work of indefinite length: using a travelling band