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TECHNICAL PAPERS

Drying of Dielectric Materials Using a Continuous Microwave Belt Drier (Case Study: Ceramics and Natural Rubber)

[+] Author and Article Information
P. Rattanadecho1

Faculty of Engineering,  Thammasat University (Rangsit Campus), Pathumthani, Thailand 12120ratphadu@engr.tu.ac.th

A. Watanasungsuit

Faculty of Engineering and Industrial Technology,  Sillpakorn University, Rajamakanai Road, Amphoe Muang, Nakorn Pathom, Thailand 73000

A. Duanduen

 National Metal and Materials Technology Center, Pathumthani, Thailand 12120

N. Suwannapum

Faculty of Engineering,  Thammasat University (Rangsit Campus), Pathumthani, Thailand 12120

1

Corresponding author.

J. Manuf. Sci. Eng. 129(1), 157-163 (Aug 24, 2006) (7 pages) doi:10.1115/1.2386166 History: Received November 23, 2005; Revised August 24, 2006

In this study, the drying of dielectric materials by a continuous microwave belt drier has been investigated experimentally. Most importantly, it focuses on the investigation of drying phenomena under microwave environment. In this analysis, the effect of the irradiation time, sample sizes, and microwave power level (number of magnetrons (800W∕1 magnetron)) on overall drying kinetics and mechanical properties are studied. The dielectric materials studied are classified into two types including ceramics (microwave demolding of tableware product) and natural rubber. The results showed that using the continuous microwave applicators technique has several advantages over the conventional method such as shorter processing times, volumetric dissipation of energy throughout a product, and high energy efficiency compared with other process, and it offers improvements in product quality. The results presented here provide a basis for fundamental understanding of microwave-heating of various kinds of dieletric materials. Further quantitative validation of experimental data could be very useful, especially in providing information for processing high performance microwave drying for developing the ceramics and rubber industries in Thailand.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental apparatus: (a) microwave continuous belt drier and (b) location of 14 magnetrons

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Figure 2

Tableware samples cast in four different size and shapes of mold

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Figure 3

Preliminary results of specific energy consumption

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Figure 4

Demolding time for tableware under conventional versus microwave drying

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Figure 5

Weight loss of various types of tableware under conventional versus microwave drying

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Figure 6

Modulus of rupture (MOR) of tableware product

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Figure 7

Drying kinetics versus microwave power level at 20% of weight loss constant

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Figure 8

Temperature profile with respect to elapsed times as a parameter of sample thickness

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Figure 9

Temperature profile with respect to elapsed times as a parameter of microwave power level

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Figure 10

Heating pattern in natural rubber

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Figure 11

Microstructure of natural rubber after drying

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