轧孔单板-塑料复合无醛胶合板的热压工艺研究  

Hot-pressing technology of formaldehyde-free plywood made by veneers with rolling holes and high-density polyethylene film

作　　者：叶翠仙[1] 杨文斌[2] 徐剑莹[3] 陈祖建[1] 廖瑞[3] 钟柱[3] 

机构地区：[1]福建农林大学艺术学院,湖南长沙412004 [2]福建农林大学材料工程学院,福建福州350002 [3]中南林业科技大学材料与工程学院,湖南长沙412004

出　　处：《西北农林科技大学学报（自然科学版）》2015年第12期76-82,共7页Journal of Northwest A&F University(Natural Science Edition)

基　　金：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)

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8-10min的条件下,WPCP胶合强度、静曲强度（MOR）和弹性模量（MOE）分别为1.21-1.32MPa,42.76-65.81MPa和6 678.43-8 348.93MPa,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1.0MPa,热压时间10min,WPCP的MOR、MOE分别为64.13和8167.57MPa,相当于中等硬材水平。【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 hotpressing temperature of 170-180 ℃,hot-pressing pressure of 1.0-1.2MPa 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 ofⅠtype plywood.【Conclusion】Based on the consideration of both cost and performance of WPCP,the optimized conditions were：hot-pressing temperature 170 ℃,hot-pressing pressure 1.0MPa,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.

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 

分 类 号：TS653.3[轻工技术与工程]