Abstract: Proposed is a composite film including a first film layer attached to an upper surface of a steel member, a second film layer positioned on the first film layer, and a mesh film layer positioned on the second film layer and having a mesh structure. A portion of the mesh film layer is embedded into the second film layer during a heat compression process when the composite film is manufactured. The composite film improves the water resistance, chemical resistance, abrasion resistance, and durability of a steel member when the steel member is coated with the composite film.

Abstract: Proposed is a composite film including a first film layer attached to an upper surface of a steel member, a second film layer positioned on the first film layer, and a mesh film layer positioned on the second film layer and having a mesh structure. A portion of the mesh film layer is embedded into the second film layer during a heat compression process when the composite film is manufactured. The composite film improves the water resistance, chemical resistance, abrasion resistance, and durability of a steel member when the steel member is coated with the composite film.

Abstract: A microwave oven including a frozen food defrost mode and a food drying function according to the present invention includes: a body formed with a space therein; a humidity sensor measuring a humidity value of the space; a magnetron emitting microwaves towards the space; a power transformer supplying power for operating a heater of the magnetron; a high voltage transformer providing power for operating a resonator of the magnetron; a power supply unit supplying power to the power transformer and the high voltage transformer; an output adjusting unit for selecting and adjusting so that the magnetron outputs any one of a plurality of set output levels; and a control unit controlling an output of the microwave according to the output level selected in the output adjusting unit, blocking the power supplied to the magnetron when the humidity value input from the humidity sensor remarkably increases in short time.