Method of manufacturing hot dip coated metal strip
US6242048A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 2000 |
| Grant date | Jun 5, 2001 |
| Priority date | — |
| Expiry date | Jun 20, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A molten metal is deposited on the surfaces of a metal strip by continuously dipping the metal strip in a coating bath. The metal strip is lifted at a constant speed while supported with a pair of upper and lower support rolls in the coating bath. The coating weights of the molten metal deposited on the surfaces of the metal strip are adjusted by wiping the molten metal with gases from gas wiping nozzles disposed above the surface of the coating bath. The metal strip is advanced while supported with a pair of upper and lower touch rolls, wherein the metal strip is advanced by setting the distance L between the upper support roll disposed in the coating bath and the lower touch roll disposed outside the coating bath within the range determined by a formula L.ltoreq.80.times.T.times.W.sup.2 /V, where L: distance between the upper support roll in the coating bath and the lower touch roll outside the coating bath (mm), V: line speed of the metal strip (m/min), T: tension imposed on the metal strip (kgf/mm.sup.2), and W: target coating weight per one side of the metal strip (g/m.sup.2). The stable quality of the metal strip can be obtained by reducing the variation of the coating weight…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.