| 摘要 |
<p>The thawing and cooking time of frozen hamburger patties (9) at minus 20 degrees Celsius can be reduced by the combination of ohmic and plate heating. The frozen patties (9) are held between metallic plates (2 and 4) heated to at least 180 degrees Celsius and which also acts as electrical contacts with the patties (9). Each plate is connected to a source of alternating current (50, 20) supplying a peak power consumption of about 13 watts/sq.cm of surface area of each patty (9) to be heated, so that interior of the patties can be heated by an electric current passing through the patty (9) as the patty (9) is also heated by the plates (2 and 4).</p> |
