Roofing Sheet Manufacturer Introduction to the Curing Process
|25.4.2019||Posted by juniperqq under Advertising & Marketing|
Today, China PPGI corrugated roofing sheet manufacturer introduces the curing process of color steel coils.
In the production process of color steel coils, the substrate can pass through the baking furnace at a speed of up to 140 m/min. In order to ensure a satisfactory curing time, the length of the baking furnace is generally 30 to 50 m. After the substrate is painted, both sides are wet paint film. In order to suspend the substrate through the furnace cavity, there are generally two furnace types: air floating type and hanging type.
The air-floating type uses the upward airflow in the furnace to support the substrate. The suspension type uses the tension generated by the tension roller before and after the strip to control the orientation of the strip in the furnace. Because of the long interval, the substrate of the hot sale prepainted color galvanized coil will have a certain drape. The furnace cavity needs to be planned as an anti-bow type. The color coating unit generally uses hot air heating, and there is also a method of heating the gas incineration exhaust gas. The furnace temperature is divided into 4 to 5 zones for control so that the temperature profile in the furnace can be changed as required by the coating used.
It is now possible to use a linear and curved heating method to cure the color steel coil. Straight line refers to the curing method in which the furnace temperature of the baking oven is completely the same in 4~5 areas; the curve type refers to the method of curing the coating in 4~5 areas in the furnace. If the furnace length is 50 m, the unit speed is 120 m/min, and the strip with a thickness of 0.5 mm can be heated at a uniform temperature of 310 °C, 310 °C, 310 °C, 310 °C, 310 °C, and can also be used at 210 °C. Heating at 260 ° C, 330 ° C, 350 ° C, and 320 ° C in 5 different sections of the furnace temperature. The best temperature profile requirements for each coating for each unit are determined by practice.