Also, insufficient pasteurization can result in turbidity of the beer or sedimentation. These are undesirable and have been defined as "bready", "biscuity", "burnt-type tastes", "papery" or "cardboardy". If pasteurization causes the temperature of the beer to reach too high a level, certain tastes called "pasteurization tastes" can occur in the beer. These types of tunnel pasteurizers are available in single and double deck configurations. The water running off the packages is collected in reservoirs, heated or cooled, and recycled to the sprays or spray pans. The temperature of the beer in the containers is progressively raised to the desired level before being passed through the cooling zones where it reaches the desired beer out temperature (BOT). In this type pasteurizer, water is sprayed onto the tops of the closely packed packages which are moved through a tunnel which is divided into preheat zones, heating zones, holding zones, and cooling zones. Other patents showing pasteurizer and pasteurization processes pertinent to this invention include Becker U.S. However, high quality can and bottle beer traditionally is pasteurized for long shelf life, and conventional type pasteurizers are shown in Herold U.S. Draft beer generally is not pasteurized because it is kept refrigerated and is usually consumed in a short time. The various organisms in beer are not pathological and dangerous to humans, but affect the taste and appearance of the beer if allowed to grow. inputs and temperatures and times will vary according to the product being treated. Pasteurization is the reduction of microorganisms by heating to a limited temperature and holding at that temperature such that there will be minimum effect on physical stability and flavor and a maximum extension of biological stability, thereby increasing shelf life.Īlthough the present application describes the invention with reference to the pasteurization of beer, the invention also is applicable to all products which are pasteurized in a package, including soda and other soft drinks, fruit juices and drinks, and milk. Pasteurization has been used in the wine and brewing industry for many years having been developed around 1865 by Louis Pasteur. The system of claim 4 including means for storing data representing the measured spray water temperatures and measured times each package remains in each zone and means for recalling and displaying said data at will in the future. The system of claim 1 including means for storing data representing the measured spray water temperatures and measured times each package remains in each zone and means for recalling and displaying said data at will in the future.Ĩ. input can be monitored at said remote location.ħ. The system of claim 1 wherein the means responsive to the measured spray water temperatures and measured times each package remains in each zone is connected to a remote location whereby the P.U. input for packages leaving the pasteurizer tunnel to an operator.Ħ. The system of claim 4 including means for displaying the maximum cold spot temperature, the average product out temperature and the P.U. The system of claim 1 wherein the means responsive to the measured spray water temperatures and measured times each package remains in each zone also empirically calculated the maximum cold spot temperature and the average product out temperature in each package leaving the pasteurizer tunnel.ĥ. The system of claim 1 including means for measuring the product package feed as a percent of the available bed surface.Ĥ. input to said packages leaving the pasteurizer tunnel to an operator.ģ. The system of claim 1 including means for displaying the P.U. input to each package leaving the pasteurizer tunnel.Ģ. Means responsive to the measured spray water temperatures and measured times each package remains in each zone for empirically determining the P.U. Means for continuously measuring the time each package remains in each zone and Means for continuously measuring spray water temperatures in the zones along the length of the pasteurizer, Water spray means for spraying water onto packages passing through the tunnel at a uniform spray density across the width of the tunnel and at progressively different temperatures to form a heating zone, a holding zone and a cooling zone from the one end to the other of the tunnel, A system for continuously and automatically monitoring a tunnel pasteurizer includingĪ tunnel pasteurizer having a finite length divided into a succession of zones and having a finite width and means for passing packages through the tunnel from one end to the other thereof,
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