The concept of the drying device is based on a combined method of convection and radiation heat transfer. The heat sources are special infrared heaters, which can achieve a high power density over the area available in the machine. The main component of heat transfer is radiation transmission, which brings maximum efficiency and economy, because in this method the heat energy is transmitted directly to the sheets, but mainly to the colour. The ambient air is not heated by the passage of the heat radiation. In addition, hot air is also blown onto the sheets, making drying even more efficient and uniform, and thus also very suitable for drying aqueous dispersion varnishes. The stack temperature should not exceed 40°C to avoid softening of the colours and sticking of the sheets. The temperature of the stack is measured by a contactless optical sensor and, based on its signal, a fast PID controller with automatically adjusted control constants controls the power input of the heater so that the set stack temperature is maintained very precisely automatically.
The design of the equipment leads to substantial energy savings. The delivery includes one heating panel, electric box with control panel, blower, hose and suction filter with silencer. Warm air extraction is available as an option, which minimizes thermal influences of the offset and mold rollers and the inking unit of the printing machine by waste heat, and includes an exhaust fan with a stand, hose and collecting nozzle. The device is designed and manufactured in compliance with regulations and standards of EU countries in terms of construction, operation and safety of operators and it is equipped with CE declaration.
