Control of Reddish-Brown Coloration in Drying Maple Sapwood.

摘要

Producers of hard maple lumber have difficulty in consistently kiln-drying it to the normal light orange-yellow color or the very whitest color specified for some products. For the white color, they believe winter-cut, air-dried material is required. Research has shown that normal, white, or discolored lumber can be produced from air-dried or green 4/4 or 5/4 hard maple by changing kiln conditions. A low-temperature, low relative humidity kiln schedule produced white stock. A moderate-temperature, moderate-humidity schedule produced the normal-colored maple. Operational malfunctions that cause unwanted high-humidity conditions that produce reddish-browned stock are discussed, and precautions in using the low-temperature schedule are included. (Author)