Tunnel type powder coating ovens
Tunnel-Type Powder Coating Curing Ovens
Tunnel-type ovens are convection ovens used in powder coating plants that enable the curing of electrostatically powder-coated workpieces to around 180-200°C, usually within 10 minutes. They are designed with a length suitable for the conveyor speed to ensure the polymerization and curing of the workpieces passing through the oven. However, the geometric shapes and weight of the workpieces are taken into consideration in the oven dimensions design.
These ovens are conveyor-driven, and the product inlet and outlet are designed according to the largest workpiece dimensions. The ovens can be designed in tunnel, U, S, or M shapes according to the largest workpiece dimensions and workshop dimensions. Electricity, liquid, or gas fuel is used for heating the ovens.
OVEN STRUCTURE
The tunnel-type powder coating oven consists of an oven body made of sandwich panels filled with 150 mm thick rock wool, an oven heating system, a circulation fan, and a heat exchanger unit with a burner for gas/diesel fuel ovens or an electric resistance heat exchanger for electrically heated ovens. Air curtains placed at the oven inlet and outlet prevent hot air loss from the oven to the environment.
The temperature controller is digital and easily adjustable, and a safety thermostat is included for safety purposes.
OPERATING PRINCIPLE
The oven heating system is designed as a forced convection system. It is based on the principle of increasing the oven temperature by passing the air volume inside the oven through a thermoblock unit with a circulation fan and pumping it into the oven, and thus increasing the oven temperature through the heat transfer provided by the air passing through the heating unit.
The walls of the oven and heating unit are made of modular sheet metal and high-density insulated panels. Adjustable vane air distribution channels inside the oven ensure that the oven temperature is homogeneous at every point.
The heating unit is located on the side or top of the furnace and consists of an insulated heating chamber, a heat exchanger made of stainless steel sheet metal, a circulation fan capable of operating at 250ºC, and a maintenance hatch.
The furnaces are CE certified and manufactured in accordance with European standards.
