High Temperature Drying of Yellow Birch

Using temperatures just above the boiling point of water and with intermittent steaming, yellow birch was dried from the green condition in 2 days with little degrade. Collapse in the hardwood was the only significant defect. Comparative static bending and toughness tests indicated that no reduction in these strength properties resulted from drying at high temperatures. It is believed that the general practicality of using temperatures above the boiling point of water to dry softwoods has been established. The power used to evaporate one pound of water was significantly lower in the case of high temperature drying. Higher temperature drying produced slightly greater discoloration. High humidity conditions at the start of a run resulted in a very marked delay in development of discoloration. Collapse is perhaps the only obstacle to the successful application of high temperature drying to yellow birch. Selective high-temperature drying or the drying of blanks and dimension might become a worthwhile proposition from the stand point of economy. With high temperature drying, careful and thorough end coating will be imperative and sticker spacing will have to be reduced.

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