Process and apparatus for regulating the degree of roasting, especially of coffee

Abstract From the Canadian patent

The degree of roasting of materials roasted by application of microwaves is regulated by a system free from any energy source which receives material from a microwave roaster and retains it for a time for completing roasting and varying and regulating the final degree of roasting of the material by regulating the feed of the roasted material from the system to a quenching zone. The microwave roaster includes a horizontal rotatable tube which has baffles for transporting the material to be roasted through the tube such that it reaches a roasting temperature at the outlet of the tube for receipt by the system for achieving the desired degree of final roasting.