After coating the aluminum foil is subjected to surface treatment on the basis of non-coated aluminum foil formed on, in addition to non-coated aluminum foil provided with the required chemical composition, mechanical properties and geometry and other performance indicators, should also have a good plate and coating performance.

1, the aluminum foil plate:

First, the coating of aluminum foil production process have a good plate of aluminum foil, which is a prerequisite for the production of aluminum foil coating. Indicators to measure plate unit is I. General plate coating production equipment requirements are within 20-40I, if greater than this value, you need to add a set of equipment before coating tension leveling system. Its aluminum coating equipment running routes generally are longer, treatment processes, and guide roller is greater. Therefore, if the system is not equipped with tension leveling, plate appears once in operation is not good since it is easy to break, resulting in inability to produce. Air conditioning production process for aluminum foil plate also have higher requirements. General heat sheet punching production line uses vacuum suction way transfer foil, aluminum foil plate if not good, the surface is not flat, it will lead to a vacuum suction way aluminum foil can not be normal. Therefore, not only is the coating of aluminum foil plate, an important technical indicators are also non-coating of aluminum foil.

2, coating properties:

As mentioned above there are many kinds of heat transfer sheet with aluminum foil coating, foil coating used on the market today are mainly hydrophilic aluminum foil, so here only in respect of the hydrophilic aluminum foil coating performance indicators discussed.

3, coating thickness:

Aluminum foil surface coating thickness no hard requirements, generally in the 3 / 1m or less. Paint because prices are generally more expensive, so the premise of meeting the performance requirements of the more thin film thickness control, lower production costs. Coating thickness directly affects the performance index of the coating, thus requiring the coating to the surface of the aluminum foil thickness uniform.

4, coating adhesion:

Fastness of coating adhesion is bonded to its surface coating of aluminum foil targets. If the coating adhesion is too small, the coating of aluminum foil in the further processing and use, the surface coating film is easy to fall off, which would seriously affect the weight of the coating of the aluminum foil, thus requiring the stronger the better coating adhesion. Coating adhesion generally only qualitatively detect the main detection methods are abrasion test, cut test and cupping method.

5, hydrophilic properties:

Hydrophilic aluminum foil in use for some time, because by leaving the role of various environmental factors affected the hydrophilic properties of the surface. Therefore, hydrophilic properties are generally divided into hydrophilic properties of hydrophilic and after initial resistance to environmental testing. Hydrophilic performance has mainly to measure the size of a corner. General product requirements early hydrophilic a <100, after environmental testing resistance hydrophilic request a <250. Contact angle measurements can choose a specific contact angle meter; can also be a certain amount of volume of the water droplets in the size of the area occupied by the surface of the aluminum foil were calculated.

6, corrosion resistance:

Corrosion resistance is mainly reflected in three aspects: First, alkali resistance, due to the lubricating surface alkaline cleaning agents required to remove the heat sheet after punching, it requires the function of aluminum foil surface coating must have a certain alkali resistance general requirements soaked in a 20% NaOH solution for 3 minutes without blistering; the second is resistant to salt spray corrosion test conditions generally in the 35 oC, 3% salt spray environment requires 500 hours can not have corrosion spots. Salt spray corrosion resistance is directly related to the heat transfer sheet length of life. In coastal areas, due to the high salt content in the air, so the heat transfer sheet has high resistance to salt spray corrosion requirements; Third, heat-resistant properties, that at a certain temperature, humidity must place a long time corrosion sex. The performance is also an important indicator to measure the heat transfer sheet weathering capabilities.