AZ150 galvalume steel coil/Galvalume Steel Coil

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The principle of vacuum evaporation
Will be plated film base material (tubular) in a vacuum evaporation machine, vacuum pump, vacuum to make the vacuum coating 2 ~ 1.3 x 1.3 x 10-10-3 pa, crucible made of high purity aluminium wire heating at 1200 ℃ ~ 1400 ℃ temperature melting and evaporation into gaseous aluminum. Gaseous aluminum particles in a moving film substrate surface deposition, the reduction which form a layer of continuous cooling and light metal aluminum layer. By controlling the metal aluminum evaporation speed, film base material movement speed and vacuum coating chamber to control the thickness of aluminum plating layer, general aluminized layer thickness in 25 ~ 500 nm, aluminum plating film width of 800 mm to 2000 mm.
(1) direct evaporation method.Is the town of base material directly through vacuum coating machine, the metal aluminum evaporation in the substrate surface to form a aluminum plating film.Direct evaporation method for the requirement of the base material is higher, especially to the formation of a surface brightness of metal film, must demand base material has good surface smoothness.If the paper surface is rough, to adopt direct evaporation method, need before the aluminized coating on the surface.In addition, in the process of evaporation is smaller than the base material of the volatiles.So there is big limitation in direct evaporation method for base material, it is mainly suitable for plastic film evaporation, can also be used for the evaporation of paper, but the quality of the paper demand is high, and the quantitative of the paper has a certain limit.
(2) transfer method.Is with the carrier membrane (vacuum aluminum plating film) will be transferred to the surface of the substrate metal aluminum layer formed by aluminum plating film.Transfer method is developed on the basis of the direct evaporation method of new process, it overcomes the limitations of direct evaporation method to base material requirement, is especially suitable for aluminium coated in all kinds of paper and paperboard, also can be used for plastic film coated with aluminum.Overseas has will transfer method is applied to the cloth, fiber, leather, etc. On the base material of aluminium products.The main transfer method is used to produce aluminium coated paper.
Aluminum plating film production process:
Rolling to vacuum, heating evaporation boat base material to the aluminum wire, evaporation and cooling to thickness, flattening and winding
Plastic film of aluminum plating process generally straight plating method is adopted, the aluminum layer directly plated on the substrate surface.
BOPET, BOPA film base material without surface treatment before plating aluminum, can be directly to evaporation.And nonpolar such as BOPP, CPP, PE plastic film, in front of the evaporation need corona processing on the surface of a thin film or adhesive coating layer, make its surface tension at 38-42 dyne/cm or has good adhesiveness.
Evaporation, will roll film placed in the vacuum chamber, close the vacuum chamber vacuum.
When the vacuum degree reaches a certain mba (4 x 10-4 or above), the evaporation boat up to 1300 ℃ ~ 1400 ℃, and then send the purity of 99.9% aluminium wire continuous to evaporation on the boat.
Regulating rolling speed, winding speed, good wire feed speed and evaporation, open the cooling source, make the aluminium wire on the evaporation boat continuously melt, evaporation, and after the movement of the surface of the film cooling form a layer of polished aluminum layer is the aluminum plating film.

Galvalume Steel Sheets

Grade:SGCH
Zinc Coating:40-180g/m2
Inner Diameter:508/610mm
Spangle:Small/Standard/Big    (regular, zero and minimized)
Hardness:50<=HRB<=90
Usage:Roofing Sheet
Thickness:0.13-3.0mm

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