This article explored the effect of natural light and ultraviolet lamp radiation on the discoloration of the green part of the 4-year bamboo by using the color analyzer and Fourier transform infrared spectrometer. The results showed that both light treatment could make the discoloration of the bamboos green part obviously, and the lightness increased, the color hue (a*) changed a little, however, the color hue (b*) had a great change, and the aberration (△E*) increased with the increasing duration. FTIR results showed that the chemical structure of the bamboos green part had a change, and the components of the lignin decreased because of the degradation, but the hydroxyl increased.
Laminated veneer lumber (LVL) was manufactured from Chinese fir, which had been impregnated with laboratory prepared low-molecular-weight water-soluble phenol formaldehyde (PF) resin. The effects on the mechanical and physical properties of the LVL were investigated which made from veneer that had been subjected to various levels of the resin treatment. The results showed that either under conditions of normal temperature and pressure, or at increased pressure, the weight gain would increase with the impregnating time. Under the same impregnation technology, along with the increase of resin concentration, dry weigh gain increased, wet weight gain first increased and then decreased. Density of LVL increased, TS reduced, MOR and MOE first increased and then decreased as the weight gain increased.
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