Tech Table: Vacuum bagging supplies

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Wood Sci Technol 37 (2003) 3–9 DOI 10.1007/s00226-002-0159-z Original Climate control in vacuum dryers for convective heat transfer Part 2: Actual climates in industrial kilns and suggestions to improve kiln design Bjo ̈rn A. Ka ̈llander 3 Abstract The first part of this contribution determined the demands on climate control in vacuum drying kilns that are necessary to achieve the final moisture content variation stipulated in the European Drying Group (EDG) proposal on wood drying quality standards. In this second part of the contribution, these demands are compared with measurements of actual climates and the resulting final moisture content in vacuum kilns during industrial production. The mea- surements show that none of the studied industrial vacuum kilns are capable of controlling climate with acceptable accuracy. The variations in drying climate lead to large variations in final moisture content and reduced production capacities. Drying quality and drying capacity would be greatly increased with improved kiln design and improved climate control systems. Critical factors in kiln design and climate control system design necessary to maintain a controlled drying climate are listed. Demands on temperature and pressure control In the previous part of this contribution (Ka ̈llander 2002) it was shown that the crucial factor in climate control is maintaining the set temperature. With a pressure control system capable of maintaining the pressure within ±0.1% of the set pressure, the temperature has to be maintained within ±0.8°C of the set temperature throughout the kiln to achieve the top drying class known as ‘‘Exclusive’’. The demands on temperature control to reach different drying classes are shown in Table 1. Received: 20 April 2000 Published online: 11 April 2003 Ó Springer-Verlag 2003 B.A. Ka ̈llander (&) Stora Corporate Research AB, 791 80 Falun, Sweden E-mail: bjorn.kallander@sp.se B.A. Ka ̈llander Building Material, Royal Institute of Technology, 100 44 Stockholm, Sweden Present Address: B.A. Ka ̈llander SP Swedish National Testing and Research Institute, Box 857, 501 15 Bora ̊s, Sweden

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5,000 BF Shipping Container Lumber Dry Kiln For Quality Lumber The 5,000 BF container kiln consists of one 40 foot high-cube aluminum shipping container... More Info

Shipping Container Lumber Dry Kilns by Global Energy Global Energy designed and developed the container kiln back in 1991. The purpose is to give access to portable sawmill owners, furniture makers, and small business the value added profit of dry kiln lumber and quality hardwoods... More Info

Vacuum Kiln Conversion Kit for Lumber and Wood Dry Kilns Convert your existing conventional dry kiln into a fast drying vacuum kiln. Similar to vacuum bagging in the boat building and aircraft industry, we have come up with a proprietary process which allows you to build a very simple vacuum kiln at a fraction of the price, and without the intensive conventional metal chamber structure... More Info

Vacuum Pump Cart System for Bagging Clamping Wood Drying and more Vacuum Cart with 2HP Pump and Dual Pistons with multiple multiplex vacuum ports and liquid reservoir... More Info

Vacuum Bagging Basics Vacuum bagging is a method of clamping, which has traditionally been used in the composites industry, but can also be used for vacuum drying materials, including wood products... More Info

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