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3. Performance Test ResultsThe first part of performance tests is performed in an 18A, 50 Hz, 8,6L volume, 5,8kWelectrical furnace. At a stable temperature, beech and pinewood sawdust are dried in thefurnace and weight losses are calculated at different time periods. The drying furnacestemperature has set at 85C and time periods are 0,5 h and 1 h determined. It is known thatdrying time could be shorter in circulation furnaces than being in static furnaces. Certainly,an effective drying is inevasible as the moisture is harmful to the product surface quality.

At 85C the 500 g and 800 -1200 m mesh beech sawdust has dried for 0,5 h in the electricalfurnace at 5 repeated tests the calculated average moisture loss is 5,4% determined. Different5 repeated tests for 1 h drying the moisture loss result is 7,3% calculated (Tab. 1). The same

processes are performed for 500 g 800-1200 m mesh pinewood sawdust. For 5 times 0,5 hdrying tests are performed and the average moisture loss result is 2,8% determined. Different5 repeated tests for 1 h drying the average moisture loss result is 5,6% calculated (Tab. 1).

The second part of this section is about the performance tests results of the FBDS. Firstly, thecalibration tests of the machine are performed. According to the results, charged woodsawdust to the machine back funnel is evacuated from evacuation flange with 1% losses. The

possible reasons of these losses are back blow of charged sawdust to the back funnel andsawdust missing in delivery pipe.

While infrared heat set at 85C the 500 g and 800 -1200 m mesh beech sawdust has chargedto the back funnel of the machine. After the end of the 5 min. process the evacuated sawdustis weighted and the lost moisture content is evaluated. End of the 5 repeated tests 9,8%

moisture loss is calculated for beech sawdust. Same processes are performed for pinewoodsawdust at the same conditions. Finally, at the end of 5 repeated tests 5,3% moisture loss iscalculated for pinewood sawdust at the constructed FBDS. Charged wood sawdust to themachine back funnel is evacuated from evacuation flange in 5 min. at any process (Tab. 1).

Table 1. Experimental results of moisture losses (wt.%) of beech and pinewood sawdust.

Experiment 1 2 3 4 5 Average Std. Dev.

F B D S Pine Wood (5 min.) 4,9 6,2 5,3 4,8 5,1 5,3 0,5595

Beech Wood (5 min.) 10,2 9,1 9,9 10,3 9,3 9,8 0,5367

E l e c

t r i c a

l F u r n a c e Pine Wood (1h) 5,5 5,7 6,1 5,6 4,9 5,6 0,4336

Beech Wood (1h) 7,5 7,2 7,8 6,9 7,3 7,3 0,3362

Pine Wood (0,5 h) 2,7 2,8 3,0 2,9 2,6 2,8 0,1291

Beech Wood (0,5 h) 5,3 5,1 5,4 5,5 5,8 5,4 0,2588


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The wood sawdust taken from nature which has been used for the production of WPCmaterial contains too much moisture. In order to be used in manufacturing process its

moisture content must be reduced in probable levels. Every manufacturer might determinethat level according to individual manufacturing parameters and being used lignocellulosicmaterial properties.

100,000

100,250

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Figure 3. Beech wood sawdust weight rise according to time.

100,000

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Figure 4. Pine wood sawdust weight rise according to time.


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In this work, in FBDS dried pine and beech wood sawdust materials are left 36 h at standardroom conditions (30% RH, 23C ) and re -moistening amount is determined. At the end of 36

h time period beech wood sawdust has re-moisturized at 2,27% as weight rise. Pine woodsawdust weight rise has determined as 1,25% (Fig.3 and Fig.4).

Over moisture in lignocellulosic materials affects the composite materials production processin a negative way. Considering this truth, the moisture keeping and re-moistening propertiesof additive materials in left room conditions should be determined so that available time

period of manufacturing for dried material must be stated.

4. ConclusionIn this work, the construction of a FBDS which works as desiccators to dry appropriate grainsized lignosellulosic materials is presented and the machines performance test results arerepresented.

Performance tests results of the designed dryer show that it has higher and homogenyhumidifying capability than traditional furnaces. The vital advantage of this design issupplying the continuity of the composite production process. The material can be charged tothe back funnel and be evacuated from evacuation flange continuously than be charged to

production process. The represented high performance dryer system makes ready to use ofthe wood-based materials continuously for the continuous production of composite materials

by saving time and labor.

For a homogeny drying traditional methods need too much time and require labor force. Onthe contrary FBDS can be performed in minutes-time and doesnt need additional laborexcept feeding the material to the back funnel.

Acknowledgement: This work is supported by Industrial Ministry of Turkish Republicnumbered 00215.STZ.2007-2SANTEZ project.

References

Additive development aid growth in wood plastic composites, Plastics additives &Compounding, 2002.

Gosselin, R., Rodrigue, D. (2006). Injection Molding of Postconsumer WoodPlasticComposites I: Morphology. Journal Of Thermoplastic Composite Materials, Vol. 19, 639-657.

Gosselin, R., Rodrigue, D. (2006). Injection Molding of Postconsumer WoodPlasticComposites II: Morphology. Journal Of Thermoplastic Composite Materials, Vol. 19, 659-669.


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Kck, M., Demirbas, A. (1999). Kinetic study on hydrolysis of biomass (Ailanthus altissima

chips) by using Alkaline-glycerol solution. Energy Conservation&Management, vol. 40,1397-1403.

Akhtar, M., Scott, G., Swaney, R., Shipley, D. (2000). Biomechanical pulping: a mill-scaleevaluation. Resource Conservation and Recycling, vol. 28, 241-252.

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