PDF Publication Title:
Text from PDF Page: 012
implementation in the wood industry requires substantial planning, testing and new approaches (Hansen 2005). Lead-time reduction has become a common goal for wood product supply chains. However, the drying process remains elusive to these efforts in the hardwood industry. Water must be removed from the wood prior to its manufacture into goods such as flooring, furniture and other mill work; therefore, it must be dried. Lumber is normally kiln-dried in large batches, which consumes a large percentage of the total manufacturing time. Drying times can vary greatly, for example, 4/4 hardwood lumber can range (From 4 to 30 days) depending on species, initial moisture content and method of drying, When lumber is air-dried first, the total drying time is much longer. For example, air-drying red oak from green to 20 % MC takes 60 to 120 days (Simpson 1991). Air drying is often done to reduce drying costs and increase kiln throughput. Research is needed on alternatives to conventional drying technology that would allow manufacturers to achieve a leaner production system. According to the lean manufacturing philosophy, improvements in product mix (e.g. species, size, and grade) and time flexibility can lead to higher customer satisfaction, reduced costs and increase competitiveness (Quesada and Buehlman 2001). Vacuum drying has the potential of achieving shorter drying times, drying smaller and mixed (two or more species) loads, and achieving at least the same drying quality as conventional drying, while allowing delivery of the product to the customer on time. These potential benefits can help to improve the overall hardwood supply chain in the U.S. and hopefully increase competitiveness. Vacuum drying of hardwood lumber has been proven (particularly in Europe and in the USA) in many applications to be a more economical alternative to drying using conventional methods, with similar or better quality outcomes (Savard et al. 2004). Vacuum drying allows drying at low temperatures, and faster drying with fewer defects. Water in wood at sub-atmospheric pressure can be vaporized and moved at temperatures below 100 oC as rapidly as for high temperature drying at atmospheric pressure. Therefore, vacuum drying has the benefits of high temperature drying without the danger of developing defects in some susceptible species. 2PDF Image | Impact of Vacuum-Drying on Efficiency of Hardwood Products
PDF Search Title:
Impact of Vacuum-Drying on Efficiency of Hardwood ProductsOriginal File Name Searched:
Brenes_Angulo_OM_T_2014.pdfDIY PDF Search: Google It | Yahoo | Bing
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
CONTACT TEL: 608-238-6001 Email: greg@globalmicroturbine.com (Standard Web Page)