. The butter industry, prepared for the use of creameries, dairy students and pure food departments. Butter. 196 Paste;urization with objectionable flavors and odors, such as may be derived from weeds, wild onions, etc., or from undesirable fermentations of the cream prior to pasteurization. On the other hand, there are some serious objections to the use of surface coolers. There is a tendency to recontaminate the cream. This is especially the case in an ill-ventilated factory where the air is teeming with undesirable germ life and odors. Again the exposure of the hot cream to air and light, w
. The butter industry, prepared for the use of creameries, dairy students and pure food departments. Butter. 196 Paste;urization with objectionable flavors and odors, such as may be derived from weeds, wild onions, etc., or from undesirable fermentations of the cream prior to pasteurization. On the other hand, there are some serious objections to the use of surface coolers. There is a tendency to recontaminate the cream. This is especially the case in an ill-ventilated factory where the air is teeming with undesirable germ life and odors. Again the exposure of the hot cream to air and light, while run- ning over the copper surface cooler, invites oxidation of some of the components of the cream which may lead to serious butter defects, such as tallowy, metallic or fishy flavor, etc. For this reason this type of cooler cannot be recommended; coolers which do not expose the hot cream excessively to air and light are preferable. VAT PASTEURIZATION Vat Pasteurizers.—The vat pasteurizers on the market are of two general types, namely jacketed vats with plain agitators and non-jacketed vats with hollow disc or coil agitators. In the jacketed vats and tanks, with plain agitators the inside wall of the jacket surrounding the vat furnishes the heating surface. The jacket is charged with a continuous flow of the heating or cooling- medium, or the heating or cooling medium is sprayed against the outside of the heating surface. The cream. Fig-. 31. Frogrress vat pasteurizer Courtesy Davis-W^atkins Dairymen's Mfg. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hunziker, Otto Frederick, b. 1873. La Grange, Ill. , The author
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbutter, bookyear1920
