Lecture+2.+Sanitary+Design

Lecture+2.+Sanitary+Design - UNIVERSITY OF CALIFORNIA...

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Department of Viticulture and Enology VEN 135 WINE TECHNOLOGY AND WINERY SYSTEMS 2. SANITARY DESIGN The idea of “sanitary design” is common in the food and beverage industry, as well as the pharmaceutical and microelectronics industries. While the level and implementation may vary among industries, the general idea remains the same. In sanitary design, equipment and systems are designed to be “cleanable,” so that dirt and potential contaminants will not be harbored or released by the equipment into the intermediate or final product. For the wine industry, the idea of sanitary design is important for two main reasons. First, we want to be able to control what organisms grow in the product during fermentation and after fermentation (for stability). Even in the case of “uninoculated” or “natural” fermentations, we want to be able to control the appearance or accumulation of “undesirable” organisms that may enter the winery environment. Second, we do not want to introduce other contaminants into the process stream that will affect the ease of downstream processing or final product quality. Examples of this type of contaminant to be avoided would be large clumps of dirt or organisms that break away from the equipment after initial entrapment, paint chips, small pieces of rubber, grease, or rust. The two main means of accomplishing sanitary design in a winery setting are by choice of “materials of construction” and by design of fittings, equipment, and piping configuration. These are the topics that we will focus on for this lecture. MATERIALS OF CONSTRUCTION The characteristics of a “good” material for sanitary design are that they are cleanable, corrosion-resistant, and contain no “leachables.” Materials that fit these characteristics include glass and stainless steel, as well as various polymer materials such as EPDM (ethylene propylene diene monomer) and PTFE (i.e. teflon, polytetrafluoroethylene). Other types of materials might also be suitable, but would depend on the application. If materials get irreversibly stained, they may be too porous for sanitary use. Material like oak would most likely not fit into the definition of a sanitary material. This does NOT, however, mean that these materials can not be used for processing. It simply means that special handling or cleaning regimens may have to be incorporated into normal processing, or equipment with these materials may have to be treated as a consumable. Stainless Steel
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Lecture+2.+Sanitary+Design - UNIVERSITY OF CALIFORNIA...

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