Download Development of Products and Packaging for Use in Microwave by M W Lorence, P S Pesheck PDF

By M W Lorence, P S Pesheck

Improvement of Packaging and items to be used in Microwave Ovens presents a concentrated and entire overview for builders within the meals and packaging industries. the 1st part discusses the rules of microwave heating and ovens. The textual content emphasizes the influence of foodstuff dielectric homes and geometry on heating uniformity, style optimization, and hues of microwave meals. the second one half discusses microwave packaging fabrics and layout with chapters that hide inflexible packaging, susceptors, and protecting. additionally mentioned are product improvement, oven security, and machine modeling of microwave items.

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The edge overheating effect is investigated for high-permittivity dielectrics in the work by Sundberg (1998a). Furthermore, resonances between food items in the near vicinity of each other are illustrated in Plate V. e. foods with convex surfaces, refraction and reflection phenomena will result in concentration of the Influence of food geometry and dielectric properties 47 microwave power distribution to the geometrical centre for certain diameters (Ohlsson and Risman, 1978). This phenomenon is called centre overheating.

Fc11 < fmn), both TE and TM modes may coexist. This is called a multimode operation. The field pattern and behavior of the wave is easier to characterize for a single mode compared to multimode. Most rectangular waveguide are designed to carry TEz10 mode. 45 GHz, a WR340 waveguide which has dimensions of a ˆ 86 mm and b ˆ 43 mm is commonly used (Guru and Hiziroglu, 2004). 45 GHz operating frequency is within the range and would propagate in the TEz10 mode. 9 Field patterns in single-mode and multimode cavities During microwave heating, materials are enclosed in spaces surrounded by metal walls.

J. Food Science 37: 199±204. , 2006. Elements of Electromagnetism, Oxford University Press, Oxford. , M. Riegel, 2005. The Microwave Processing of Foods, CRC Press, Woodhead Publishing Limited, Cambridge. R. Heldman, 2001. Introduction to Food Engineering, 3rd edn, Academic Press, New York. , 1983. Speed of light from direct frequency and wavelength measurements. Bibliographic note from 17th Conference Generale des Poids et Mesures. , 2005. Dielectric properties of foods. In Microwave Processing of Foods.

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