While the hydrophilic aluminum foil is used as a warmness exchanger, there are high requirements for the coating residences along with adhesion, corrosion resistance and hydrophilicity. Which will make sure the coating overall performance of the hydrophilic aluminum foil, the pre-treatment earlier than coating is especially essential.
Degreasing
The currently used degreasing agent is an alkaline answer containing Na+, and the ideal operating temperature is 20-40 °C. While the degreasing temperature is just too low, the interest of the degreasing agent is low, and the reaction with the oil at the floor of the aluminum foil is slow, which influences the cleaning effect of the aluminum foil surface.
When the temperature of the degreasing liquid is better than 40 °C, the hobby of the degreasing agent is better, and it can react violently with the oil at the surface of the aluminum foil, and the cleaning effect is better.
But, if the concentration of the degreasing solution is too excessive or the degreasing time is too lengthy, it will reason corrosion spots on the surface of the aluminum foil, so that you can have an effect on the coating production.
Washing
So one can prevent the residual alkaline degreasing solution from affecting the surface of the aluminum foil, the aluminum foil desires to be wiped clean twice. Due to the fact the pastime of the degreasing liquid is more potent whilst the temperature is above 40 °C, a good way to efficaciously easy the degreasing liquid at the floor of the aluminum foil and the oily combination after the reaction, the temperature of the recent water cleansing tank is controlled at 40-60 °C.
On the identical time, after the recent water rinsing tank, it is going to be washed with the aid of the normal temperature water to make certain that the degreasing liquid on the floor of the aluminum foil and the response combination between the degreasing liquid and the oil stain are thoroughly cleaned.
Drying
After the cleaning and pretreatment of the aluminum foil, it must be dried before coating manufacturing to make certain that the floor of the aluminum foil is easy and dry during the coating production, for you to save you the color difference and missing coating defects due to the wet surface of the aluminum foil in the course of the coating production, if you want to affect the coating fine.
The temperature of the drying furnace gas is managed at 300~400 ℃ to ensure that the floor of the aluminum foil is dry and could no longer be deformed or wrinkled because of excessive temperature, so that you can ensure the first-class of coating production.
Via pretreatment, the the adhesion of its coating film is robust, the corrosion resistance is ideal, and the non-stop hydrophilicity is right, that may meet the manufacturing needs of different clients for hydrophilic aluminum foil.
As an air conditioner aluminum foil manufacturer, Huawei Aluminum can deliver undeniable aluminum foil and extraordinary types of hydraulic aluminum foils like gold or blue hydrophilic aluminium foil. Welcome to depart message underneath to inquire what you want.
In order to keep the temperature and concentration of every cleaning tank, squeeze rollers are hooked up at the retailers of the degreasing liquid cleaning tank, hot water cleaning tank and ordinary temperature water cleaning tank.
