Blue coated hydrophilic aluminum foil for air conditioner have become an important variety of air conditioning aluminum foil due to the excellent corrosion resistance and hydrophilic properties, and have a tendency to further replace non coated bare aluminum foil for air conditioner. In recent years, hydrophilic coated aluminum foil have grown from scratch, from small to large. At present, the proportion of hydrophilic coating aluminum foil in the total air-conditioning foils has reached about 50% of air-conditioning foils. According to the current development trend, the amount of hydrophilic coated aluminum foil will reach more than 70%. Some varieties of air conditioners are now all produced with hydrophilic aluminum foil.
The surface of the blue coated hydrophilic aluminum foil for air conditioner has strong hydrophilicity. When used in air conditioners, it can optimize the ventilation effect of the heat exchanger, thereby increasing the heat exchange rate by 5%. In addition, the blue hydrophilic coated aluminum foil for sir conditioner also has other advantages such as anti-corrosion, anti-mold, no peculiar smell, etc. It is mainly used for medium and high-end and export air conditioners.
The specification of blue coated hydrophilic aluminum foil for air conditioner are:
Temper: O, H22, H24, H26
Coil ID: 75, 150, 505mm
Blue coated hydrophilic aluminum foil for air conditioner have been produced for over 20 years. Generally speaking, the production methods of hydrophilic coated aluminum foil mainly include chemical immersion method and mechanical roll coating method. The mechanical roller coating method is divided into single-layer coating film, double-layer coating film and multi-layer coating film. In terms of production methods, chemical immersion is relatively simple, while roll coating is more complicated. In terms of product performance, the roller coating is better than the soaking method, and the product performance of the multi-layer coating is better than that of the single-layer coating. From the perspective of hydrophilic coated aluminium foil production, there are currently two types of single-layer roll coating and double-layer roll coating. Here we only introduce the production methods of single-layer and double-layer roll coating.
The production process of single-layer roll hydrophilic coated aluminum foil is as follows:
Unwinding → pretreatment → surface roller coating → drying → coiling
The production process of double-layer roll hydrophilic coated aluminum foil is as follows:
Unwinding → pretreatment → first roll coating → first drying → second roll coating → second drying → coiling
It can be seen from the above process flow that there is no difference between pretreatment, unwinding, and coiling in the production process of single-layer and double-layer hydrophilic coated foil for air conditioner, but there are only one and two differences between roll coating and drying. The function of pretreatment is mainly to enhance the bonding force between the coating and the aluminum foil, and the coating plays the role of increasing the hydrophilicity and corrosion resistance of the product. For products with higher performance requirements, if the primary coating fails to meet the due indicators, a secondary coating is required. Generally speaking, a single-coat hydrophilic aluminum foil product has both a hydrophilic function and a corrosion-resistant function in one coating. For double coated hydrophilic aluminium foil products, the first coating plays a role in corrosion resistance, and the second coating plays a hydrophilic role.