Hydrophilic Coating Aluminium Foil ▼

Hydrophilic Coating Aluminium Foil
Air conditioner fin aluminum foil
Blue hydrophilic aluminium foil finned evaporator

Hydrophilic coating aluminium foil is formed by the hydrophilic treatment of the surface of bare foil . Blue hydrophilic aluminium foil is the most commonly used material for hydrophilic aluminium fins. The second is the golden hydrophilic aluminium foil.In addition to the chemical composition , mechanical properties and geometric dimensions required by hydrophilic coating aluminium foil , it should also have good plate shape and coating performance .

1 . The production process of hydrophilic aluminium foil requires that the aluminium foil has a good plate shape , which is a prerequisite for the production of coating aluminium foil , because only a good version is the basis of the coating , so that the hydrophilic coating aluminium foil manufactured later Causes uneven coating . The unit for measuring the shape index is I . The requirements of general coating production equipment on the plate type are within 20-40I . If it is greater than this value , a tension straightening system needs to be added in front of the coating equipment .

Generally , the aluminium belt of the coating equipment has a longer running route and more processing procedures . Therefore , if it is not equipped with a tension straightening system , it is easy to fold during operation once the plate shape is not good , resulting in production failure . The production process of air conditioning fins also has high requirements for the shape of aluminium foil . The general heat exchange sheet punching production line uses vacuum suction cups to transfer aluminium foil . If the aluminium foil has a bad plate shape and an uneven surface , it will cause the vacuum suction of aluminium foil to not work properly .

2 . Coating performance . As mentioned earlier , there are many types of coating aluminium foils for heat exchange fins . The coating aluminium foils used in the previous market are mainly hydrophilic aluminium foils . Therefore , only the coating performance indicators of hydrophilic aluminium foils will be discussed here .

3 . Coating thickness . The thickness of the coating film on the surface of the aluminium foil is not hardly specified , and is generally below 3 / 1m . Since the price of paint is generally more expensive , the thinner the thickness of the coating film is , the lower the production cost are under the premise of meeting the performance requirements . The thickness of the coating directly affects the performance indicators of the coating , so the thickness of the coating on the surface of the aluminium foil must be uniform .

4 . Coating adhesion . Coating adhesion is an indicator of the adhesion fastness of aluminium foil to its surface coating . If the coating adhesion is too small , the surface coating film will easily fall off during further processing and use of the coating aluminium foil , which will seriously affect the weight of the coating aluminium foil . Therefore , the stronger the coating adhesion , the better . Coating adhesion can only be tested qualitatively . The main testing methods include abrasion resistance tests , cross-cut test and cupping method .

5 . Hydrophilic property . After being used for a period of time , the hydrophilic aluminium foil will be affected by various environmental factors , which will affect the hydrophilic properties of the surface . 

Therefore , the hydrophilic property is generally divided into the initial hydrophilic property and the hydrophilic property after the environmental resistance test . The quality of the hydrophilic property is mainly measured by the size of angling a . The initial hydrophilicity of general products requires a <100 , and the hydrophilicity after environmental resistance tests requires a <250 . The measurement of the contact angles a can use a special contact angle measuring instrument ; it can also be calculated by the size of the area occupied by a certain volume of watering droplet’s on the aluminium foil surface .

6 . Corrosion resistance . The corrosion resistance is mainly reflected on three aspects : one is alkali resistance , because the lubricating oil on the surface of the heat exchanged plate after punching needs to be removed from an alkaline cleaning agent , so the functional coating on the surface of the aluminium foil must have a certain alkali resistance It is generally required to be immersed in 20% NaOH solution for 3 minutes without foaming ; second , it is resistant to salt spray corrosion .

Generally , it is required to have no corrosion spots on 500 hours of a test condition of 35 oCs and 3% salt water spray environment . The corrosion resistance of salt spray is directly related to the service life of the heat exchange fins . In coastal areas , due to the high salt content in the air , there is a high requirement for the salt spray corrosion resistance of the heat exchange fins ; the third is the heat and humidity resistance , that is , the corrosion resistance for a long time at a certain temperature and certain humidity Sex .

This performance is also an important indicator to measure the heat resistance of the heat exchange fins . Most of the hydrophilic coating aluminium foils we export are blue . You can also use gold , black , green , red and other colors to paint according to your requirements . The unique hydrophilicity of this product can effectively increase the heat exchange rate by 10-15% . It has anti-corrosion and anti-mildew function and no odor . This product is widely used in household air conditioners and water tanks . For detailed product specifications , please refer to the product list or contact us .

 

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