10. A disposable microwave food heating package adapted to contain a food product comprising an outer
container body formed from paperboard, a lossy microwave absorptive heating element comprising a compos
ite sheet mounted within the container, said composite sheet comprising an upper layer of a metal foil and a
lower paint-like layer comprising a microwave absorptive substance in particulate form and a binder bonding
the particles together and maintaining the absorptive layer in contact with the metal sheet, said paint-like
layer being at least about 0.016" thick and being substantially within the range wherein the layer thickness
and the temperature response during microwave heating are positively correlated, said container body having a top wall and a microwave opaque shield member comprising an electrically conductive metal sheet
bonded to the top wall, said shield at least partially surrounding when the food is placed within the package
to provide a predetermined controlled amount of direct microwave energy transmission into the food in an
amount less than that which would be received by the food without the shield, whereby the food is simultaneously heated by the dual effect of controlled microwave radiation heating and by conduction from the composite sheet.