Production and improvement of high performance particleboards.

研究了酚醛树脂处理刨花板的尺寸稳定性和生物抗性。对于用低分子量PF-树脂的处理，采用一步处理方法。该方法是喷涂低分子量树脂和粘合剂树脂的混合物。浸渍用PF树脂的浓度与热固化后的树脂负载量（RL）之间的关系近似于直线。为获得15%RL，日本雪松使用约8%的树脂溶液。RL对PF树脂处理板材的尺寸稳定性和力学性能有很大影响，并且随着RL的增加，抗溶胀效率（ASE）值增加。在相同的RL下，小分子量的树脂比大分子量的树脂具有更大的ASE值。从加速实验室生物降解试验中获得的结果表明，RL工作良好，以提高腐烂和白蚁的董事会的抵抗力。对于褐腐真菌，重量损失在15%RL下显著降低，而对于白腐真菌，即使在低RL下，攻击也几乎完全被抑制。所采用的张开处理是一步处理，其被认为在纸板生产中节省时间和成本效率是优选的。这些板值得考虑用于商业应用。

Dimensional stabilization and biological resistance of particleboards made from phenol-formaldehyde (PF) resin-treated particles were investigated. For the treatment with a low-molecular-weight PF-resin, an one-step treatment method was employed. The method is to spray a mixture of the low-molecular-weight resin and the adhesive resin. The relationships between concentrations of PF-resin for impregnation and resin loading (RL) after heat curing were approximately on a straight line. To attain a 15% RL,about 8% resin solutions was used for Japanese cedar.Dimensional stability and mechanical properties of the PF-resin treated boards were affected considerably by the RLs, and as the RL increased, the antiswelling efficiency (ASE) value increased. Smaller molecular weights of resins gave larger ASE valus than larger ones at the same RLs. Results obtained from accelerated laboratory tests of biodegradation suggested that RLs worked well to enhance decay and termite resistance of the boards. For a brown-rot fungus, the weight loss was substantially reduced at 15 % RL,whereas attack was suppressed almost entirely even at low RLs for the white-rot fungus. The splaying treatment employed is a one-step treatment that is considered preferable for time saving and cost efficiency in board production. These boards are worthy of consideration for commercial application.