What is the manufacturing process of solar water heater insulation barrel?

The process of making a solar water heater water tank is as follows: Firstly, the inner tank of the water tank should be prepared and the water should be tested by squeezing it. Once you are successful, you can move on to the next step. Attach the inner tank and the outer skin of the water tank and use a foaming machine to foam the sandwich between the inner tank and the outer skin. The foaming material is polyurethane, which is the same as the insulation used in refrigerators. Solar energy has a thicker insulating layer. The thermal insulation effect is better. After mossing, if the water temperature is low in winter, it should be placed in the greenhouse for at least 24 hours. Otherwise, the insulating layer is not yet finalized and will deform due to low temperature. Production is now complete.