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

N. Suwannapum

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

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


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.

Copyright © 2007 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 1

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

Grahic Jump Location
Figure 2

Tableware samples cast in four different size and shapes of mold

Grahic Jump Location
Figure 3

Preliminary results of specific energy consumption

Grahic Jump Location
Figure 4

Demolding time for tableware under conventional versus microwave drying

Grahic Jump Location
Figure 7

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

Grahic Jump Location
Figure 8

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

Grahic Jump Location
Figure 9

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

Grahic Jump Location
Figure 10

Heating pattern in natural rubber

Grahic Jump Location
Figure 11

Microstructure of natural rubber after drying

Grahic Jump Location
Figure 5

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

Grahic Jump Location
Figure 6

Modulus of rupture (MOR) of tableware product



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In