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Kinetic Analysis and Characterization of Epoxy Resins ... - FedOA

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Experimental 63<br />

Figure 2.8: Front view <strong>and</strong> microwave distribution inside the cavity.<br />

The microwave plant has a mode stirrer, ensuring at a distance from the metallic<br />

surfaces, an isotropic statistical distribution <strong>of</strong> electromagnetic field.<br />

Figure 2.9: Side oven view <strong>and</strong> magnetron position.<br />

2.2.2 VPMS<br />

The microwave oven, produced by Microglass s.r.l.<br />

uses a Variable Power<br />

Microwave System (VPMS). While domestic microwave ovens use a time-slicing<br />

control system <strong>of</strong> the applied power.<br />

This last method enables the application<br />

always <strong>of</strong> the greatest power, but for time intervals proportional to the power<br />

selected by the user. For example, if a oven has a maximum power <strong>of</strong> 1000 W, <strong>and</strong><br />

if an operator chooses to use the oven with the 25% <strong>of</strong> the maximum power, the<br />

time-slicing device applies a power <strong>of</strong> 1000 W for the 25% <strong>of</strong> the selected time. A<br />

63

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