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

By M W Lorence, P S Pesheck

Improvement of Packaging and items to be used in Microwave Ovens presents a targeted and finished evaluation for builders within the meals and packaging industries. the 1st part discusses the foundations of microwave heating and ovens. The textual content emphasizes the influence of meals 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 disguise inflexible packaging, susceptors, and protective. additionally mentioned are product improvement, oven protection, and computing device modeling of microwave items.

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By M W Lorence, P S Pesheck

Improvement of Packaging and items to be used in Microwave Ovens presents a targeted and finished evaluation for builders within the meals and packaging industries. the 1st part discusses the foundations of microwave heating and ovens. The textual content emphasizes the influence of meals 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 disguise inflexible packaging, susceptors, and protective. additionally mentioned are product improvement, oven protection, and computing device modeling of microwave items.

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In composition. 44 Packaging and products for use in microwave ovens materials are heated side by side, temperature differences will result from the combined differences in dielectric and thermal properties, when uniform microwave field strength is anticipated. 2 Concentration effects A slab with sharp corners and edges which is microwave heated will show field and energy concentrations there, which cause selective heating, especially at the corners. Briefly described, a sharp edge or corner will act as an antenna and attract more energy than surrounding areas.

To satisfy the boundary condition that the tangential electric field intensity at the metal wall is zero, the reflected wave is 180ë out of phase with the incident wave at the reflection surface. The reflected wave and the incident wave, traveling with equal amplitude but in opposite directions, form a field pattern that appears to be stationary (referred to as a standing wave) with fixed locations of zero intensity, where the two waves are 180ë out of phase, and maximum intensity, where the two waves are in phase.

The first and second waves interfere and form a standing wave pattern with node (minimum amplitude) and anti-node (maximum amplitude) at fixed locations. The standing waves in microwave cavities create cold and hot spots, which is one of the main reasons for uneven heating. 1 Voltage standing wave ratio In a general case where a reflective surface is not a highly conductive material, only a portion of the incident wave is reflected. 40). 8 Voltage standing wave ratio: (a) incident wave in phase with partially reflected wave; (b) incident wave 180ë out of phase with partially reflected wave; (c) incident wave in phase with completely reflected wave; (d) incident wave 180ë out of phase with completely reflected wave.

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