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Feasibility of using two exotic larch species as raw material for medium density fiberboard panel manufacturing


, : Feasibility of using two exotic larch species as raw material for medium density fiberboard panel manufacturing. Forest products journal 56(5): 48-52

The feasibility of using two exotic larch species Larix gmelinii and Larix sibirica as raw material for medium density fiberboard (MDF) panel manufacturing was studied. Laboratory MDF panels were fabricated from fibers of these two individual larch species mixed at an approximate ratio of 4:1, and the properties of MDF panels made from fibers of spruce, pine, and fir (SPF) were studied as a control. A 10 percent urea-formaldehyde (UF) resin and 0.5 percent wax were blended with the fibers that were generated from larch or SPF. The schedule and temperature used for panel hot-pressing were kept constant when making the two types of panels. According to American National Standard ANSI A 208.2-2002 for evaluation of MDF panels for interior application, the modulus of rupture (MOR) of panels made from larch or SPF both met the requirement of Grade 120. The modulus of elasticity (MOE) of panels made from larch did not meet the ANSI minimum requirement, while the MOE of panels made from SPF met the requirement of Grade 120. Larch panels produced favorable internal bond (IB) strength compared to panels made from SPF. The IB of larch panels was 0.78 MPa, and met the requirement of ANSI grade 140. The MOR and MOE of panels made from larch were lower than those of panels made from SPF. This difference can be compensated for through optimizing hot-pressing parameters so as to acquire a desirable panel density profile. Additionally, properties of MDF panels made from larch can be improved by properly manipulating refining parameters to reduce fine fiber content in the pulp. It was also found that linear expansion of panels made from larch was significantly higher than that of panels fabricated from SPF. According to ANSI/AHA A 135.4-1995 standard for basic hardboard, thickness swell and water absorption of the two types of panels were below the maximum specified values. It can be concluded that it is feasible to use the two exotic larch species as raw material for MDF panel manufacturing, although they are still inferior to SPF.

US$29.90


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