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    Author(s): Hongmei Gu; Siqun Wang; Trairat Neimsuwan; Sunguo Wang
    Date: 2005
    Source: Forest products journal. Vol. 55, no. 12 (Dec. 2005): pages 239-245
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (219 KB)


    The multiple layer structure of oriented strandboard (OSB) has a significant influence on its performance, including thickness swell (TS). TS is recognized as an important performance property for OSB products. Optimization of TS through layer property ma- nipulation to achieve the lowest total TS while maintaining acceptable mechanical properties is attainable if the influence of OSB panel parameters on layer TS is known. In this study, the effect of wood species, resin type, and vertical density profile (VDP) on the total and layer TS were examined. Results from a small sample of commercial OSB panels indicated that aspen OSB exhibited the lowest total TS among the three commonly used materials for OSB panels (southern yellow pine, aspen, and yellow-poplar) in North America. Comparison of the product’s VDP indicated the panel characterized with a flat density in the face and core regions and an abrupt drop in density from face to core forming a “u-shaped” profile may provide good dimensional stability (layer TS) due to the structural uniformity in each region. The high-density surface layers placed a significant effect on the panel’s total TS. Seventy-three, 70, 65, and 55 percent ofthe total TS occurred in the top and bottom face regions, which accounted for less than 50 percent ofthe panel thickness, at 2-, 8-, 24-, and 96-hour water exposure times. With the increase of water exposure time, face dominating TS decreased. Statistically significant linear relationships were found between the edge TS and TS at 1 inch inside from the edge, which is the standard TS for panel products in ASTM D 1037 at each water exposure time. The difference between the two TSs decreased with the time of water exposure. The trends demonstrated by this research, while not inclusive of all commercial OSB, may be useful for assessing manufacturing process changes to improve TS performance.

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    Gu, Hongmei; Wang, Siqun; Neimsuwan, Trairat; Wang, Sunguo. 2005. Comparison study of thickness swell performance of commercial oriented strandboard flooring products. Forest products journal. Vol. 55, no. 12 (Dec. 2005): pages 239-245


    Floors, aspen, gums, resins, particle board, moisture, verticle density profile, yellow-poplar, southern yellow pine, swelling, oriented strandboard, OSB

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