Erratum

Abstract

Southern pine and aspen flakes were acetylated with acetic anhydride alone without cosolvent or catalyst by a simple dip procedure. The new procedure greatly shortens reaction time and simplifies chemical recovery. Acetylation weight gains of 15% to 20% can be achieved in 1 to 3 hours with southern pine flakes and in 2 to 4 hours with aspen flakes.

Flakeboards made from acetylated southern pine or aspen flakes absorbed much less water, both in water-soaking tests and when subjected to humid air, and swelled at a lower rate and to a lower extent than did control boards.

Hygroscopicity of the resulting flakeboards decreased with increased level of wood acetylation. The equilibrium moisture content (EMC) for flakeboards made from acetylated flakes was lower at each relative humidity tested than that of control boards.     

刨花施胶效果的定量表征与分析

在回顾国内外刨花施胶效果检测技术研究状况的基础上,建立了全新的量化刨花施胶效果表征参数体系,并采用胶黏剂扫描(GlueScan)系统对刨花施胶效果进行量化分析.结果表明,该法可高效、准确地测定刨花表面的胶黏剂分布状况,通过对各参数的分析,为刨花施胶工艺改进的效果提供依据.     

PROFIBUS-DP总线在刨花板生产线中的应用

基于PROFIBUS-DP总线技术设计了刨花板生产线控制系统,介绍了现场总线技术的特点,对PROFIBUS总线与PLC、变频器等之间的通讯相关技术进行了分析,对系统中预压机机械定位系统进行了重新设计,该系统已应用于刨花板生产实践.     

落叶松生物油/酚醛树脂胶粘剂制备刨花板的工艺研究

以生物油替代45%苯酚(质量分数)制备生物油/酚醛树脂(PF)胶粘剂,并以此作为制备刨花板用胶粘剂。以热压温度、热压时间、刨花含水率以及施胶量为试验因素,静曲强度、内结合强度和甲醛释放量为评价指标,采用正交试验法优选出制备刨花板的最佳工艺参数。结果表明:制备刨花板的最佳工艺参数为热压温度180℃、热压时间8min、含水率12%和施胶量10%;在此工艺条件下制备的刨花板,其强度满足GB/T4897-2003标准要求、甲醛释放量达到GB/T18580-2001标准中E0级要求。     

Adhesive bonding of acetylated aspen flakes Part 3. Adhesion with isocyanates

Flakeboards made from control flakes bonded with an isocyanate resin outperformed phenolic-bonded control boards in thickness swelling tests in both liquid water and water vapour. Less irreversible swelling occurred in isocyanate-bonded control boards as compared to phenolic-bonded control boards. Flakeboards made from acetylated flakes, using either a phenolic or isocyanate resin, swelled in thickness much slower and to a lesser extent in liquid water and water vapour tests compared to control boards. Isocyanate-bonded control and acetylated aspen flakeboards had higher internal bond and modulus of rupture values and approximately equal modulus of elasticity properties when compared to a similar series of boards bonded with a phenolic resin, as reported in Part 1 of this series.     

刨花板施胶施蜡控制系统的设计与实现

根据刨花板施胶施蜡工段的生产工艺,对施胶施蜡控制原理进行了分析,介绍了微机控制系统的软、硬件设计方法,为国产刨花板生产线的自动化改造提供了有益的经验.     

三聚氰胺-乙二醛-甲醛共缩聚树脂合成研究

以三聚氰胺、甲醛和乙二醛为原料,在碱性条件下成功合成了均一透明的三聚氰胺-乙二醛-甲醛共缩聚树脂(MGF),并将MGF胶粘剂用于刨花板的制备。以红外光谱(FT-IR)法、差示扫描量热(DSC)法和核磁共振(13C-NMR)法等为测试手段对MGF的结构和性能进行了表征和测定,并采用正交试验法优选出合成MGF的最佳工艺条件。结果表明:当n(甲醛)∶n(三聚氰胺)∶n(乙二醛)=2.2∶1∶0.4、反应温度为75℃和pH=9.0时,MGF的综合性能相对最好,并且其室温储存期超过30 d。     

三聚氰胺含量对MUF性能的影响

MUF(三聚氰胺-尿素-甲醛共缩聚树脂)兼具UF(脲醛树脂)和MF(三聚氰胺甲醛树脂)的优点,通过调节m(三聚氰胺)/m(尿素)配比,可得到性价比较高的MUF;然后采用MUF胶粘剂制备刨花板,并考察了三聚氰胺含量对刨花板的内结合强度、耐水性和耐沸水性等影响。结果表明:三聚氰胺的引入,虽能有效提高MUF的性能,但并非加量越多越好;当w(三聚氰胺)=11.0%~14.0%时,MUF的性价比相对最高,相应刨花板的内结合强度、耐水性和耐沸水性俱佳。     

浅谈稻秸薄板的生产

介绍稻秸薄板和厚板的工艺区别、稻秸薄板生产工艺.     

浅议桉木水泥刨花板

介绍国内外水泥刨花板的发展概况,水泥刨花板的生产与应用,水泥刨花板生产的原料-桉木,展望水泥刨花板发展前景。