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2021

How is the nonstick coating applied?

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Chuangzhi Coating

In the process of using non-stick pans, I believe many people do not know how the coating of non-stick pans is sprayed on. As a manufacturer of non-stick pan spraying production line, I will introduce the specific production process to you today.
There are two types of non-stick coatings that can be seen on the market. The first type is polytetrafluoroethylene coating, commonly known as Teflon; the second type is ceramic coating. Although the coating is different, the process flow is similar. Next, I want to introduce the PTFE coating that is very common in our daily life.

The blanks of non-stick pans are almost all aluminum alloy materials. One of the reasons is that the thermal expansion and contraction of aluminum alloy materials and the thermal expansion and contraction of Teflon coating are more synchronized. If you use an iron pan to make a non-stick pan, the staggered thermal expansion and cold contraction will make the coating more likely to crack and fall off.
In order to better allow the coating to adhere to the pot, we must first use physical or chemical means to pre-spray the pot. The purpose is to remove the residual grease and dirt on the surface, and to make the inner surface of the pot body rough. The most commonly used in this step is the sandblasting process. Sandblasting is a very widely used surface treatment process in industrial production. It is a process of cleaning and roughening the surface of an object using the impact of high-speed sand flow.

After the pre-spraying treatment, we get a clean and rough inner surface of the pot, and then the coating can be sprayed. Under normal circumstances, non-stick pans will be sprayed with two coats, the first coat is the primer and the second coat is the top coat. Primer can be understood as glue. It helps non-stick materials that hardly stick to the inner surface of the pot. After the primer is sprayed, it is heated and baked to dry and solidify, and then use the machine after cooling. Spray the top coat. Then the sintered topcoat is cured at high temperature, and finally, the temperature is controlled to cool. The non-stick coating is sprayed on.
The specific production process of non-stick pan is as follows:
1. Pre-treatment process: upper part-hot water washing-alkaline washing-water washing-water washing-neutralization-water washing-water washing-lower part;
2. Sand blasting process: upper part-sand blasting-water washing and sand removal-cleaning-drying-lower part;
3. Inner paint line process: upper part—dust removal—preheating—primer spray—drying—cooling—preheating—medium spray—top paint—to high temperature furnace—low temperature Volatilization-high temperature sintering-cooling-lower parts;
4. Outer paint line process: upper part—dust removal—preheating—primer spray—drying—cooling—preheating—spraying paint—transfer to high-temperature furnace—high-temperature sintering—cooling— -The next piece.

The above is the common process in the production of non-stick pans. Of course, the specific process should be adjusted according to actual needs, such as how many times to spray paint and how much temperature. In the above non-stick pan coating spraying process, conveying equipment, electric control equipment, etc. are needed to assist in conveying and controlling. If you want to know more about the production process of non-stick pans, please visit the Attractivechina website.

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