Radio-frequency dielectric drying of short lengths of northern red oak

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U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory , [Madison, Wis.]
Drying apparatus., Hardwoods -- United States -- Drying., Red oak -- Dr
Statementby William T. Simpson.
SeriesResearch paper FPL -- 377.
ContributionsForest Products Laboratory (U.S.)
The Physical Object
Pagination8 p. :
ID Numbers
Open LibraryOL18022031M

Drying. One approach could use radio-frequency drying. In this investigation short lengths of northern red oak were dried rapidly, but energy con-sumption and honeycomb were ex-cessive in drying to low moisture levels.

However, rapid radio-frequency dielectric drying to 25 to 30 percent moisture content followed by more conventional finish. Get this from a library.

Radio-frequency dielectric drying of short lengths of northern red oak. [William Turner Simpson; Forest Products Laboratory (U.S.)] -- Northern red oak boards, 1 inch thick by 4 inches wide by 24 inches long, were dried from an initial moisture content of approximately 80 percent of various final moisture contents by radiofrequency.

Get this from a library. Radio-frequency dielectric drying of short lengths of northern red oak. [William Turner Simpson; Forest Products Laboratory (U.S.),] -- Northern red oak boards, 1 inch thick by 4 inches wide by 24 inches long, were dried from an initial moisture content of approximately 80 percent of various final moisture contents by radiofrequency.

Radio-frequency dielectric drying of short lengths of northern red oak William Turner Simpson William Turner Simpson Not In Library. Oak-cottonwood plywood Ronald W. Jokerst Not In Library. The air seasoning and kiln drying of wood Hiram Leroy Henderson Not In Library.

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H., 1 book Aurelian Dăscălescu, 1 book Gordon. Radio-frequency dielectric drying of short lengths of northern red oak Simpson, William T. Research Papers. Relationship between longitudinal stress wave transit time and moisture content of lumber during kiln-drying Simpson, William T.; Wang, Xiping.

Journal Articles. Radio Frequency drying can offer benefits over conventional drying, including faster line speeds, consistent moisture levels, lower drying temperatures, smaller equipment. PSC Radio Frequency dryers can result in drying times reduced from 24 hours to 90 minutes and.

alternating electric field in the radio frequency spectrum, a natural application for dielectric drying. Moreover, levelling out of uneven moisture content distribution in the lumber has also been credited to the RF/V drying method (1,7).

The fundamental principle of RF heating (1 to MHz), is to physically. Radio-frequency (RF) dielectric heating or microwave dielectric heating, induces molecular friction in mater molecules to produce heat, is determined in part by the moisture content of food [4, 5, 10, 12].

The basic arrangement for a dielectric heating system is that Author: Babu Sena Paul, Dan V Nicolae. The dielectric or radio frequency heating equipment available today for wood gluing purposes is a highly engineered apparatus that contains all possible safeguards to make the operation a safe and easy one.

The actual operation of the equipment is usually very simple and the operator has a minimum of instruments to watch during the curing cycle. Radio frequency (RF) heating is a promising technology for food applications because of the associated rapid and uniform heat distribution, large penetration depth and lower energy consumption.

A small fraction () of water molecules is always dissociated into H+ and ions lead to a residual conductivity of 4 x S/m even for very clean water. Therefore water is inadequate. The electric susceptibility χ e of a dielectric materials is a measure of how easily it polarizes in response to an electric field.

This, in turn, determines the electric permittivity of the material and thus influences many other phenomena in that medium, from the capacitance of capacitors to the speed of light.

It is defined as the constant of proportionality (which may be a tensor. Drying speed that is up to 10 times faster than conventional lumber kilns. Superior quality: effective temperature control and hydraulic shaping prevents cracking and deformation.

Suitable for short drying times, while still being flexible. The high radio frequency kills insects and bacteria in the wood. Finally, the electrodes used in RF dielectric bonding are much simpler than the shaped coils used for inductive bonding, References 1 Hill, N., Vaughan, W., Price, A.

and Davis, M. "Dielectric Properties and Molecular Process" (van Nostrand, London, ) 2 McCrum, N.G., Read, B.E. and Williams, G. "Anelastic and Dielectric Effects in Polymeric Cited by: Radio Frequency Transistors: Principles and Practical Applications is a complete tool kit for successful RF circuit design.

As cellular and satellite communications fields continue to expand, the need for RF circuit design grows. Radio Frequency Transistors contains a wealth of practical design information based on years of experience from authors who have worked with the leading manufacturers. Since Radio Frequency-convection is a common system, our lab has a combination dryer to evaluate the effectiveness of Radio Frequency and convection.

Pilot units may also be available for short term leasing to conduct larger scale testing in your plant. Contact a PSC application engineer to discuss your application and arrange a feasibility study. Press forming and surface processing. As LG Nb has a larger crystal size than that of FG, it has a stronger anisotropy, especially at the edges of the Nb sheet where smaller crystals are gathered, as shown in Fig.

e of this strong anisotropy, the cell edges become unleveled and the thickness varies widely after press forming, as shown in Fig. by: 1. : APPLICATION OF RADIO-FREQUENCY HEATING TO UTILITY POLES. PART 1. RADIO-FREQUENCY/VACUUM DRYING OF ROUNDWOOD.(Statistical Data Included): An article from: Forest Products Journal: e-Books & Docs.

Pimenov, P. Lunkenheimer, M. Dressel, G. Knebel, and A. Loidl, "Radio-frequency investigations of high-temperature superconductors", in Studies of High-Temperature Superconductors, Vol Microwave Studies of High Temperature Superconductors, PartFile Size: KB.

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Features, Specifications, Alternative Product, Product Training Modules, and Datasheets are all available. relative dielectric permittivity of the medium concerned 0: −dielectric permittivity of free space = 10 12 (F/m).

Thus the velocity of propagation in a medium of relative permittivity can be written: c v (8) where c is the velocity of light in free space (=).

In other words, is the refractive index of the dielectric Size: 1MB. uses a wireless medium - such as radio frequency transmissions - to connect computers and mobile devices, printers, and other devices. coaxial cable consists of a single copper wire surrounded by insulating material, woven or braided material, and a plastic outer covering.

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On dielectric properties of dry and wet snow On dielectric properties of dry and wet snow Hardy, Janet; Albert, Mary; Marsh, Philip The different sets of experimental data on dielectric permittivity of dry and wet snow at high frequencies have been approximated by various functions.

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