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 />
����������� � �� ����<br />
Press Dry<strong>in</strong>g - Process Technology<br />
1. Pre-<br />
Dry<strong>in</strong>g<br />
105 °C<br />
95 °C<br />
3 MPa<br />
2. Ma<strong>in</strong><br />
Dry<strong>in</strong>g<br />
3. F<strong>in</strong>al<br />
Dry<strong>in</strong>g<br />
130 ... 200 °C<br />
4. Cool<br />
Down<br />
4...10 h 3...16 h 2...4 h 2...8 h<br />
12 MPa<br />
80 °C<br />
Total process duration ~ 12 ... 24 h<br />
Time [h]<br />
Process phases <strong>and</strong> temperatures<br />
(Arboreo Technologies Ltd. - Com<strong>press</strong>ion<br />
dryers /FIN)<br />
a r b o r e o<br />
technologies<br />
TECHNICAL DATA<br />
- cell size length 6200 mm<br />
- cell size width 2200 mm<br />
- timber thickness 15 … 55 mm<br />
- kiln capacity 10 … 25 m³<br />
- <strong>in</strong>itial mc � predried … green<br />
- f<strong>in</strong>al mc � 6 … 8 %<br />
- dry<strong>in</strong>g time 6…24 hours, depend<strong>in</strong>g<br />
on the treatment <strong>in</strong>tention<br />
- energy consumption approx.<br />
250 … 300 kWh / m³
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