US 5,609,920 AGranted

Method of and apparatus for coating at least one liquid medium onto a moving material web, in particular of paper or cardboard

AssigneeVoith Sulzer Papiermaschinen GmbH

InventorBernd Riepenhausen

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Abstract

A method of coating at least one liquid medium onto a moving material web, in particular of paper or cardboard, in which method the material web is led either in a first mode of operation along a first treatment path or, in a second mode of operation, along a second treatment path, the material web being led along the first treatment path through a roll gap formed by a primary roll and a secondary roll for indirect coating of the liquid medium via the shell surface of the primary roll, or along the second treatment path over a region of the shell surface of the primary roll remote from the roll gap for directly coating the liquid medium onto the material web in the mentioned region of the shell surface of the primary roll, wherein the primary roll is driven in the one rotational direction in the first mode of operation and in the other rotational direction in the second mode of operation, and the respective general run-in and run-out direction for the material webs is substantially the same in the region of the primary and the secondary rolls along both treatment paths.

Claims16

Dependent claims

Method of coating at least one liquid medium onto a moving material web, in which method the material web is either led in a first mode of operation along a first treatment path or, in a second mode of operation, along a second treatment path, the material web being led

a) along the first treatment path through a roll gap formed by a primary roll and a secondary roll to coat the liquid medium, or
b) along the second treatment path over a region of a shell surface of the primary roll remote from the roll gap for directly coating the liquid medium onto the material web in this region of the shell surface of the primary roll, and wherein
c) the primary roll is driven in one rotational direction in the first mode of operation and in an opposite rotational direction in the second mode of operation,
characterized in that
in both the first mode of operation and the second mode of operation coating of the liquid medium is performed by means of a nozzle coating mechanism;
in the first mode of operation along the first treatment path the liquid medium is coated via the nozzle coating mechanism onto the shell surface of the primary roll which in turn coats the liquid medium onto the material web in the roll gap formed between the primary roll and the secondary roll;
and
upon changing the mode of operation from the first mode of operation to the second mode of operation and vice versa, the nozzle coating mechanism is disassembled, changed in direction by moving the nozzle coating mechanism about 180.degree. and subsequently reassembled.

5 more elements

a) along the first treatment path through a roll gap formed by a primary roll and a secondary roll to coat the liquid medium, or
b) along the second treatment path over a region of a shell surface of the primary roll remote from the roll gap for directly coating the liquid medium onto the material web in this region of the shell surface of the primary roll, and wherein
c) the primary roll is driven in one rotational direction in the first mode of operation and in an opposite rotational direction in the second mode of operation,
characterized in that
in both the first mode of operation and the second mode of operation coating of the liquid medium is performed by means of a nozzle coating mechanism, the nozzle coating mechanism, the primary roll and the secondary roll forming a first coating station;
in the first mode of operation along the first treatment path the liquid medium is coated via the nozzle coating mechanism onto the shell surface of the primary roll which in turn coats the liquid medium onto the material web in the roll gap formed between the primary roll and the secondary roll;
and
upon changing the mode of operation from the first mode of operation to the second mode of operation and vice versa, the nozzle coating mechanism of the first coating station is disassembled and transferred to a second coating station for assembly therein, while a nozzle coating mechanism of the second coating station is disassembled and transferred to the first coating station and then assembled therein.

5 more elements

Dependencies are inferred from the claim text.