A system and method for affecting the crossbow in a metal sheet in continuous coating process. The system comprises strip distance sensors for determining distances to the metal sheet. A controller is configured to adjust the position of the correcting roll, based on the strip distances, to affect the crossbow in the sheet to help control the thickness of the coating on the sheet. The system may comprise a crossbow model to help determine the new correcting roll position. The distances determined by the strip distance sensors may be also be used to adjust the position of the air knives.

The invention relates to a method for coating a metal strip with the aid of a coating device. Within the coating device, the strip first runs through a coating container with a liquid coating agent and then a stripping nozzle device for stripping off excess coating agent from the surface of the strip. After the stripping nozzle device, the strip typically runs through a strip stabilizing device with a plurality of magnets on both broad sides of the strip. A form control deviation is determined as the difference between a determined actual form of the strip and a specified desired form of the strip and this form control deviation is used for activating the magnets of the strip stabilizing device in order to transform the actual form of the strip into the desired form. As an alternative possibility for producing a moment, in particular a bending moment, in the strip, on the basis of the form control deviation the magnets of the strip stabilizing device 130 are moved in the widthwise direction R of the strip 200 into a traversing position in relation to the magnets on the respectively opposite broad side of the strip.

Provided is an apparatus for cooling a hot-dip plated steel sheet, the apparatus being capable of reducing comb-pattern surface defects occurring on the edge portion of the hot-dip plated steel sheet. The apparatus includes: a gas knife for spraying wiping gas to a steel sheet that has passed through a plating bath, thereby adjusting the plating thickness thereof; a defect prevention portion installed downstream of the gas knife so as to spray cooling gas to the steel sheet, thereby cooling same; and a moving portion for driving the defect prevention portion such that same moves.

An apparatus for the continuous hot dip coating of a metal strip is provided. The apparatus includes a vessel intended to contain a liquid metal bath, a bottom roller and a displacement casing for the metal strip. The casing includes an upper portion and a lower portion. The lower portion includes a pouring box delimiting at least two liquid metal pouring compartments. Each pouring compartment is inwardly delimited by an inner wall including an upper rim. The casing is provided with the pouring box, is rotatable relative to the metal strip around a first rotation axis and the pouring box is rotatable relative to the upper portion of the casing around a second rotation axis. A method for coating the metal sheet is also provided.

A continuous coating line includes a roll assembly exposed to molten metal. The roll assembly includes a roll rotatable relative to a bearing block. The roll includes a roll portion and a journal protruding from each end of the roll portion. The roll is made from a refractory ceramic material that is resistant to wear, abrasion, and corrosion when the roll is exposed to the molten metal.

A continuous coating line includes a roll assembly exposed to molten metal. The roll assembly includes a roll rotatable relative to a bearing block. The roll includes a roll portion and a journal protruding from each end of the roll portion. The roll is made from a refractory ceramic material that is resistant to wear, abrasion, and corrosion when the roll is exposed to the molten metal.

Provided is a method of producing a hot-dip metal coated steel strip with which a hot-dip metal coated steel strip of high quality can be produced by sufficiently suppressing edge overcoating. The method comprises spraying gas from a pair of gas wiping nozzles 20A and 20B onto a steel strip S while being pulled up from a molten metal bath 14, to adjust a coating weight of molten metal on both sides of the steel strip S, wherein a pair of baffle plates 40 and 42 are respectively placed outside of both transverse edges of the steel strip, and a height B of a lower end of each of the pair of baffle plates 40 and 42 with respect to a bath surface of the molten metal bath is set to +50 mm or less, where an upper side in a vertical direction is positive.

Disclosed is a method of producing a hot-dip metal coated steel strip capable of sufficiently suppressing generation of bath wrinkles and producing high-quality hot-dip metal coated steel strip at low cost. The disclosed method of producing a hot-dip metal coated steel strip includes: blowing a gas from a pair of gas wiping nozzles 20A and 20B to a steel strip S while being pulled up from a molten metal bath 14 so as to adjust a coating weight of molten metal on both sides of the steel strip S, in which each of the gas wiping nozzles 20A and 20B includes an injection port portion that is installed downward with respect to a horizontal plane such that an angle formed by the injection port portion and the horizontal plane is 10° or more and 75° or less, and has a header pressure below 30 kPa.

A hot dip metal plating bath roll preventing flaws in a steel sheet due to a bath roll, realizing stable running at a high speed, and improving the productivity of a plated steel sheet, which hot dip metal plating bath roll having vertical grooves each formed on an outer circumferential surface of the roll and including two first curved parts projecting to the outside of the roll and at least one second curved part arranged between the two first curved part and projecting to the inside of the roll and horizontal grooves each formed on an outer circumferential surface of the roll along a barrel length direction of the roll, a pitch P.sub.1 (mm) and depth d.sub.1 (mm) of the vertical grooves satisfying 1.0≤P.sub.1≤10, 0.2≤d.sub.1≤5, and d.sub.1≤P.sub.1/2, a depth d.sub.2 (mm) being 60% to 150% of the depth d.sub.1 of the vertical grooves, and a width w.sub.2 (mm) of the horizontal grooves being 2 times or more of the depth d.sub.2 or 2 times or more of a radius of curvature (mm) of curved surfaces forming bottom parts of the horizontal grooves and 0.7 times or less of a pitch P.sub.2 (mm), the pitch P.sub.2 (mm) of the horizontal grooves being 1.0≤P.sub.2≤10.

An apparatus for treating a metal strip after it has exited from a coating container with a liquid coating material, for example zinc is provided. The apparatus includes a blow-off device arranged above the coating container having an air outlet gap for blowing off excess parts of the still liquid coating material from the surface of the metal strip after the passing of the metal strip through the coating container. An electromagnetic stabilizer is arranged above the blow-off device and has a plurality of individual magnets for stabilizing the metal strip after leaving the coating container and the blow-off device. In order to further increase the efficiency of the apparatus, at least some of the magnets of the stabilizer are formed as pot magnets with pot coils.