Developments in vacuum drying and press drying of
Developments in vacuum drying and press drying of
Developments in vacuum drying and press drying of
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Center for<br />
Forest Products<br />
Pr<strong>of</strong>. Dr. Ressel<br />
Introduction<br />
Fundamentals<br />
Plant Facilities<br />
Innovations<br />
Process<br />
Technology<br />
Plant Examples<br />
Brunner<br />
IWT<br />
Mühlböck<br />
Kronseder<br />
Eberl<br />
Opel<br />
HeatWave<br />
Press Dry<strong>in</strong>g<br />
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Superheated Steam / Vacuum Dry<strong>in</strong>g<br />
Cont<strong>in</strong>uous <strong>vacuum</strong> dry<strong>in</strong>g <strong>in</strong> superheated steam atmosphere<br />
70<br />
60<br />
50<br />
40<br />
30<br />
20<br />
10<br />
0<br />
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Heat<strong>in</strong>g<br />
up<br />
1 st Dry<strong>in</strong>g<br />
phase<br />
Superheated vapour temperature h Vap<br />
Evaporation temperature at<br />
<strong>press</strong>ure level <strong>in</strong> the kiln h S<br />
Pressure development<br />
<strong>in</strong> the kiln p Vap<br />
2 nd Dry<strong>in</strong>g<br />
phase<br />
3 rd Dry<strong>in</strong>g<br />
phase<br />
Condition<strong>in</strong>g<br />
Wood surface temp.<br />
W ood core temp.<br />
200<br />
Avg. moisture content u m<br />
0 1 2 3 4 5 6 7 8 9<br />
R elative dry<strong>in</strong>g tim e t [...]<br />
150<br />
100<br />
50