Title:
DEVICE FOR THE CONTROLLED REDUCTION OF THE THICKNESS OF METALLIC COATINGS OBTAINED WITH THE TECHNIQUE OF THE HOT BATH IN MOLTEN METAL
Document Type and Number:
WIPO Patent Application WO/2018/025222
Kind Code:
A8
Abstract:
The present invention discloses a machinery for depositing a metal coating on continuous sheet metal, by the hot bath technique, such as for example in hot-dip galvanizing processes. An important peculiarity of this machinery is the ability to fine- tune the thickness of the coating at intervals as wide as possible to effectively cover the widest range of orders. Indeed, actual industrial logic requires that these machines be used with fast and possibly continuous rhythms; and so it is very important that they can be used to carry out the widest range of machining operations, as the requests from the market are not always foreseeable. The machinery described here is therefore innovative as it uses two thickness adjustment stages that operates alternatively. In addition, the stage used for thinner coatings is particularly innovative as it is not based on technology (known in the art) which employs the so-called "air knives". In fact, the workings required to obtain thin thicknesses are carried out by means of a mechanical removal, which is designed to handle the major criticalities associated with this type of machining where a tool is expected to come into contact with the surface to be refined. This mechanical removal is made possible by the provision of a suitable gasket, replaceable when worn or too dirty, with which to make the spatula wire that physically reduces the thickness of the coating. These gaskets are made by means of an interlacement of different types of fibers joined together to form a cord. This is to provide a good grip and strength traction (to be able to stretch it well on the spatula wire), excellent abrasion resistance (in order tο limit wear and tear) and excellent resistance to temperature (since they must be able to be used in contact with the high temperatures of the molten metal). Furthermore, the cord is designed to have a good elastic deformability in the direction of its section, and adequate properties of repellency to the molten coating material, so as to avoid that it adheres on its surface and to facilitate fluid and continuous detachment without spraying in different directions.
Inventors:
BECHERINI MARCELLO (IT)
BECHERINI MARCO (IT)
DEMOZZI ANDREA (IT)
BECHERINI MARCO (IT)
DEMOZZI ANDREA (IT)
Application Number:
PCT/IB2017/054765
Publication Date:
February 07, 2019
Filing Date:
August 03, 2017
Export Citation:
Assignee:
MEDEA S R L (IT)
International Classes:
C23C2/00; C23C2/20; C23C2/22; C23C2/40
Attorney, Agent or Firm:
BRUNI, Giovanni (IT)
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