PARTIALLY SHIELDED MICROWAVE HEATING TRAY

摘要

A partially-shielded paperboard tray for heating food in a microwave oven is mad e from a unitary blank having two sections hingedly joined at a common edge. One sectio n, which forms the bottom stratum of the tray, has a layer of aluminum foil for shi elding food along the peripheral wall of the tray from microwave radiation, but the sec tion also has a large aperture to allow the radiation to heat the center of food placed ov er the aperture. The other section of the blank, which forms the top stratum of the tra y, is transparent to microwave radiation and provides an imperforate food-contact surf ace for retaining food in the tray.