| 摘要: |
| 【目的】根据高密度聚乙烯塑料薄膜(HDPE)熔融后黏度大的特点，确定生产轧孔尾巨桉单板/HDPE复合无醛胶合板（简称WPCP）的可行性和热压工艺参数。【方法】利用数字显微镜揭示WPCP界面的微观形态特征，通过单因素试验分析WPCP的热压工艺条件(热压温度、热压压力、热压时间)对其胶合强度、静曲强度（MOR）和弹性模量(MOE)的影响，确定WPCP的热压工艺条件。【结果】 单板表面的轧孔处理可以提高塑料薄膜的渗透性，在各单板层之间形成“树枝状胶钉”薄膜结构；在热压温度170～180 ℃、热压压力1.0～1.2 MPa、热压时间 8～10 min的条件下，WPCP胶合强度、静曲强度（MOR）和弹性模量(MOE)分别为1.21～1.32 MPa，42.76～65.81 MPa 和6 678.43～8 348.93 MPa，其MOR和MOE的值均达到普通胶合板的性能要求，可以生产出符合国家 Ⅰ 类胶合板胶合强度要求的无醛木塑胶合板。【结论】综合考虑生产成本和复合板性能指标，确定优化工艺因子为热压温度170 ℃，热压压力1.0 MPa，热压时间10 min，WPCP的MOR、MOE分别为64.13和8 167.57 MPa，相当于中等硬材水平。 |
| 关键词: 轧孔单板 塑料薄膜 无醛胶合板 木塑复合胶合板 热压工艺 |
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| 基金项目:福建省科技厅引导性项目（K53150001A）；福建省科技厅重大区域专项（2012N31010102）；国家林业局“948”项目(2011-4-22)；国家自然科学基金项目(30771681) |
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| Hot-pressing technology of formaldehyde-free plywood made by veneers with rolling holes and high-density polyethylene film |
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YE Cui-xian,YANG Wen-bin,XU Jian-ying,et al
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| Abstract: |
| 【Objective】Base on the characteristics of high viscosity of HDPF after melting,the feasibility and hot-pressing technology of formaldehyde-free plywood made by Europhylla×Egrandis veneers with rolling holes and high-density polyethylene film (HDPF) were determined.【Method】The microstructure of WPCP interface was revealed using microscope.The effects of hot pressing conditions (hot-pressing temperature,pressure,and time) of WPCP on the bonding strength,modulus of rupture (MOR) and modulus of elasticity (MOE) were investigated through single factor analysis to determine hot pressing conditions of WPCP.【Result】Rolling hole treatment of veneer surface improved the permeability of plastic film and formed film structure of “branch-like glue nails” among veneer layers.Under the conditions of hot-pressing temperature of 170-180 ℃,hot pressing pressure of 1.0-1.2 MPa and hot-pressing time of 8-10 min,the numerical ranges of bonding strength,MOR and MOE of WPCP were 1.21-1.32 MPa,42.76-65.81 MPa,and 6 678.43-8 348.93 MPa,respectively.MOR and MOE met the performance requirements of ordinary plywood to generate formaldehyde free plywood in line with the National standard of Ⅰ type plywood.【Conclusion】Based on the consideration of both cost and performance of WPCP,the optimized conditions were:hot-pressing temperature 170 ℃,hot-pressing pressure 1.0 MPa,and hot-pressing time 10 min.The resulted MOR and MOE of WPCP were 64.13 MPa and 8 167.57 MPa,which were equivalent to the properties of medium hard wood. |
| Key words: veneer with rolling holes HDPF film formaldehyde-free plywood wood-plastic composite plywood hot-pressing technology |
