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Even though you’re changing the kiln conditions slowly, the lumber is drying the whole time. After a day or so your wettest sample board might be down to 20% - maybe. You’re going to have to check it to find out. (Weigh all of your sample boards to make sure you’ve got a good handle on what your highest MC is among your sample boards. Remember: Don’t use a moisture meter, rely on actual weights.) When your wettest sample board gets to 20% MC the schedule says that you can go up to 140°F dry bulb and 3.4% EMC. Keep changing the kiln settings according to the schedule as the sample boards and the lumber dry; the wood gets stronger as it dries so you can increase the severity of the conditions safely. It won’t hurt to go slowly if that’s your preference, but keep an eye on that driest sample board, because that’s the one that’s going to tell you when to wrap up the drying phase and move onto moisture equalization and drying stress relief (conditioning). GREEN LUMBER 1. Start the kiln according to the moisture content of the sample boards. If it’s green lumber, you probably will be initiating the kiln conditions at the beginning of the schedule. Most of the procedures are going to be the same as for air-dried lumber, but for green lumber it is much more important that the sample boards are located in places where the air flow is similar to that of the stickered lumber. 102PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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