Technical Report

 

Sticker stain in one-inch red alder lumber Pubblico Deposited

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https://ir.library.oregonstate.edu/concern/technical_reports/td96k2606

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  • The Oregon Forest Products Laboratory was asked in July 1953 by the Oregon Alder and Maple Company, Willamina, to work on the problem of dark stain which developed at sticker crossings in air-drying red alder (Alnus rubra, Bong.) during the summer months. Previous experience at the Oregon Alder and Maple Company had dermonstrated that the uniform light-brown shade preferred by furniture manufacturers could be obtained by kiln-drying the lumber immediately after sawing, using a high initial humidity and an initial dry-bulb temperature from 130 to 150 degrees F. It was observed that the color of the lumber when kiln-dried green could be varied from nearly white to chocolate brown by manipulation of the relative humidity and dry-bulb temperature during the first hours (approximately 48) in the kiln. Lumber handled in this manner did not develop sticker stain. This suggested the possibility of fixing the color of the lumber by a steaming treatment before air-drying. With the elimination of sticker stain and poor color, favorable air-drying weather could be used to full advantage, with the possibility of saving from 2 to 4 days kiln time. Four charges of freshly sawed one-inch alder lumber were first steamed under various conditions, then air-dried. A fifth charge was air-dried without previous steaming, as a control.
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  • Master files scanned at 600 ppi (256 Grayscale, 24-bit Color) using Capture Perfect 3.0 on a Canon DR-9080C in TIF format. PDF derivative scanned at 300 ppi (256 B&W, 256 Grayscale, 24-bit Color), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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