COMMERCIAL RFV KILN DRYING

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COMMERCIAL RFV KILN DRYING ( commercial-rfv-kiln-drying )

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One RFV kiln used for redry applications can process in the order of 2 million board feet of wets every month. This is considerably more than what a sawmill generates but what if there is now an economical solution to re-dry wet wood, what if one could generate more wets? Enough to keep a RFV kiln on a monthly basis? For a 150 MMfbm/yr (354,000 m 3/yr) sawmill, one RFV kiln can be kept at full capacity by intentionally generating roughly 20% wet lumber through the conventional kilns. This also reduces drying times in the conventional kiln by 20%, thereby increasing the effective conventional kiln capacity at the sawmill as well! As discussed by and experienced in commercial trials at Castlegar, grade recovery substantially increases. FIGURE 3. Q-Sift operating strategy. • Higher grade rem ■ Improved target size Paybacks for a $2 million Q-Sift installation for a hemfir mill producing to the Japanese market are in the order 8 months (primarily because the price for "wet" lumber is so heavily discounted). For an ALS producer to the North American lumber market, paybacks are in the order of 12 months. There is now a solution to the hemlock-drying problem as it relates to wet wood, grade recovery and drying times! Western Dry Kiln Association 43 May, 2000

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COMMERCIAL RFV KILN DRYING

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