The common air conditioner foils are1100, 3003, 8011, etc. What are its main technical parameters?
Flatness
The production process of coated aluminum foil requires that the aluminum foil has a good shape, which is a prerequisite for the production of coated aluminum foil. The unit for measuring the shape index is I. The general coating production equipment's requirements for the plate shape are within 20-40I. If it is greater than this value, a tension straightening system needs to be added before the coating equipment.
Coating thickness
The coating thickness on the surface of the aluminum foil is not strictly specified. Because the price of coatings is generally more expensive, the coating thickness needs to be thinner under the premise of meeting the performance requirements, thus reducing the production cost. The thickness of the coating directly affects the performance indicators of the coating, so the coating thickness on the surface of the aluminum foil is required to be uniform.
Coating adhesion
Coating adhesion is an indicator of the adhesion fastness of aluminum foil to its surface coating. If the coating adhesion is too small, the surface coating of the coated aluminum foil will easily fall off during further processing and use, which will seriously affect the weight of the coated aluminum foil. Therefore, the stronger the coating adhesion, the better.
Coating adhesion can generally only be tested qualitatively. The main testing methods include abrasion resistance test, cross-cut test and cupping method.
Hydrophilic properties
After the hydrophlic aluminum foil is used for a period of time, the hydrophilic properties of the surface will be affected by various environmental factors. Therefore, the hydrophilic performance is generally divided into the initial hydrophilicity and the hydrophilicity after the environmental resistance test.
The hydrophilic performance is determined by the angle formed by the water sticking to the surface of the aluminum foil. The initial hydrophilicity requirements of general products are a<100, and the hydrophilicity requirements after the environmental resistance test are a<250.
1. Alkali resistance test
Since the lubricating oil on the surface of the heat exchange fin after punching needs to be removed with an alkaline cleaning agent, it is required that the aircon aluminum foil must have a certain alkali resistance. The experimental conditions are generally immersed in 20% NaOH solution for 3 minutes, and then take out the experimental aluminum foil to see if the aluminum foil foams.
2. Test of heat and humidity resistance
This experiment is to test the degree of corrosion after a long time at a certain temperature and a certain humidity, so as to judge its corrosion resistance. This performance is also an important indicator to measure the weatherability of the heat exchanger fins.