Method and application device for the application of an aqueous treatment solution to the surface of a moving strip

Patent metadata

Field	Value
Publication number	US-2016288152-A1
Application number	US-201615015255-A
Country	US
Kind code	A1
Filing date	Feb 4, 2016
Priority date	Mar 31, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

A method for the application of an aqueous treatment solution to the surface of a strip which is moving at a preset trip speed, includes the following steps: spraying the aqueous treatment solution onto at least one rotating roll of a roll coater with a rotary sprayer having spray rotors disposed side by side in the longitudinal direction of the roll, to which the aqueous treatment solution is supplied and which are made to rotate by a spray rotor drive so that the treatment solution, driven by the centrifugal force, is sprayed in the form of a spray jet onto the surface of the roll; and applying the aqueous treatment solution to at least one surface of the strip by moving the strip past a rotating application roll of the roll coater, with the application roll transferring the aqueous treatment solution in the form of a wet film onto the surface of the strip. Additionally, related to the method, there are an application device having a roll coater and a rotary sprayer as well as to a system for carrying out the method.

First claim

What is claimed is:

1 . A method for application of an aqueous treatment solution to the surface of a strip moving at a preset strip speed in a travel direction of the strip, comprising the following steps:
spraying the aqueous treatment solution onto at least one rotating roll of a roll coater with a rotary sprayer having a plurality of spray rotors disposed side by side in the longitudinal direction of the roll, to which the aqueous treatment solution is supplied and which are made to rotate by a spray rotor drive so that the treatment solution, driven by the centrifugal force, is sprayed in the form of a spray jet onto the surface of the roll, applying the aqueous treatment solution to at least one surface of the strip by moving the strip at the preset strip speed past a rotating application roll of the roll coater, with the application roll transferring the aqueous treatment solution in the form of a wet film onto the surface of the strip.

2 . The method as in claim 1 , wherein the treatment solution is sprayed with the rotary sprayer onto the application roll.

3 . The method as in claim 1 , wherein the treatment solution is sprayed with the rotary sprayer onto a transfer roll, the axis of which runs parallel to the axis of the application roll and the surface of which is in contact with the surface of the application roll.

4 . The method as in claim 3 , wherein the transfer roll rotates in the opposite direction to the application roll, preferably at the same or at least approximately the same angular speed as the application roll.

5 . The method as in claim 1 , wherein, in a transfer zone, the surface of the application roll is in contact with the surface of the strip, with the direction of the tangential speed of the surface of the rotating application roll in the transfer zone corresponding to the travel direction of the strip.

6 . The method as in claim 1 , wherein, prior to the application of the treatment solution, the steel strip is dried with a gas stream preferably being blown in the form of a laminar hot air stream with an air knife onto the surface of the moving strip.

7 . The method as in claim 1 , wherein homogeneously distributing the wet film of the aqueous treatment solution, which was transferred onto the surface of the strip, with driven smoothing rollers and by subsequently drying the applied wet film of the treatment solution so as to produce a dry film coating of the treatment solution on the surface of the strip.

8 . The method as in claim 1 , wherein the amount of the treatment solution supplied per unit of time to the spray rotors is adjusted to the travel speed of the strip.

9 . The method as in claim 1 , wherein the strip speed is in a range between 200 and 750 m/min and the value of the tangential speed of the application roll corresponds at least approximately to the strip speed.

10 . An application device for the application of an aqueous treatment solution to the surface of a strip moving at a preset strip speed into travel direction of the strip, with
a roll coater comprising at least one first rotating roll for the application of the aqueous treatment solution to at least one surface of the strip and optionally one or more additional rotating rolls, the axes of which run parallel to the axis of the first rotation roll and the surface of which is in contact with the surface of the first roll, a rotary sprayer having a plurality of spray rotors, to which rotary sprayer the aqueous treatment solution is supplied and which is disposed at a distance from one of the rolls of the roll coater, with the spray rotors being disposed side by side along the axis of this roll and being made to rotate by a spray rotor drive so that the treatment solution, driven by the centrifugal force, is sprayed in the form of a spray jet onto the surface of this roll.

11 . The application device as in claim 10 , wherein the roll, onto which the treatment solution is sprayed with the rotary sprayer, is the first roll or a transfer roll, the axis of which runs parallel to the axis of the first roll and the surface of which is in contact with the surface of the first roll.

12 . The application device as in claim 10 , wherein the rotary sprayer serving to supply the aqueous treatment solution is linked to a supply line which comprises a supply line which is connected to the spray rotors of the rotary sprayer, on the one hand, and to a storage tank for the treatment solution, on the other hand.

13 . A system for carrying out the method as in claim 1 , comprising:
a transporting unit for transporting the strip at a preset strip speed in a travel direction of the strip; an application device, with the first roll of the roll coater serving as the application roll which, in a transfer zone, is in contact with a surface of the strip so as to apply the aqueous treatment solution to this surface of the strip with the axis of the first strip running parallel to the surface of the strip and being perpendicular to the travel direction of the strip.

14 . The system as in claim 13 , wherein the first roll of the roll coater which serves as the application roll is linked to an application roll drive which causes the first roll to rotate and/or that the first roll which serves as the application roll is in contact with a transfer roll which is linked to a drive which causes the transfer roll to rotate.

15 . The system as in claim 13 , further comprising
a first drying unit for drying the strip, a pair of driven smoothing rollers which, in the travel direction of the strip, are disposed downstream of the roll coater and which serve to homogeneously the applied wet film of the treatment solution onto the surface of the strip, and a second drying unit for drying the wet film of the treatment solution that had been applied to the surface of the strip.

Assignees

• Thyssenkrupp Rasselstein Gmbh
• Thyssenkrupp Ag

Inventors

• Wild Michael
• Michels Paul

Classifications

• C23C22/73

  characterised by the process · CPC title

• C23C26/00

  Coating not provided for in groups C23C2/00 - C23C24/00 · CPC title

• B05D3/0218

  Pretreatment, e.g. heating the substrate · CPC title

• B05D2401/20

  Aqueous dispersion or solution · CPC title

• B05D3/0413

  Heating with air · CPC title