An industrial roofing manufacturer will use a large conveyor oven rated for a maximum operating temperature of 350°F (177°C) to dry the water off a coated scrim at 200°F (93°C). The finished product is used for various roofing applications.
Designed and manufactured by Lewco Inc., the oven has a single, direct-fired, natural gas heater box with a capacity of 400,000 BTU/hr. It is equipped with two 8,000-cfm circulation fans and a 1,000-cfm exhaust fan. Variable-frequency drives are included on both circulation fans, allowing the user to adjust the convection flow depending on the product they are running. The circulation fans and integral plenums deliver uniform dual vertical airflow throughout the workspace.
Controls include a Eurotherm Nanodac temperature controller and redundant high limit controller. A PLC is interfaced with a remotely mounted touchscreen HMI, allowing the user to control all oven and conveyor operations from one interface.