| 摘要 |
<p>A tunnel freezer having a tunnel (4) has a product inlet (11) and a product outlet (10). Nitrogen can be inhibited from leaving the product outlet (10) by inclining spray bar (12) towards the product inlet (11). Similarly, excess air can be inhibited from entering the tunnel (4) through the product outlet (10) by inclining the spray bar (12) towards the product outlet (10). The inclination of the spray bar (12) is varied in response to the concentration of oxygen measured by a sensor (13) disposed inside the tunnel (4) adjacent the product outlet (10). <IMAGE></p> |
