摘要
研究表明:在满足力学性能指标的前提下,对7mm地板基材密度梯度影响最为显著的因素为热压温度,其次是热压压力、压板闭合速度、热压时间、纤维含水率,并由此得出7mm地板纤维板基材的平坦型密度梯度曲线最佳工艺为热压温度170℃,热压时间182s,热压压力7MPa,纤维含水率8%,压板闭合速度9.67mm/s;随着热压温度的升高,板子表芯层密度比增大,超过165℃,继续升温,表芯层密度比值减小,VDP曲线向平坦型变化;随着压板闭合速度的增加,地板基材表芯层密度比增大,VDP曲线向陡峭性变化;在其他条件一致的条件下,热压压力的增大,会增加地板基材表芯层密度比,芯层密度减小;热压时间越长,板材表心层密度比越小,越易制造出平坦型密度梯度曲线地板基材;板坯初含水率越大,表芯层密度比越高,芯层密度越低,VDP曲线向陡峭型变化。调控实验表明:根据试验结果最佳密度梯度分布的最优方案为热压温度170℃、热压时间182s、热压压力7MPa、纤维初含水率8%、压板闭合速度为4.14mm/s;在最佳密度梯度分布条件下,内结合强度最大的试验条件是热压温度160℃、热压时间238s、热压压力7MPa、纤维初含水率10%、压板闭合速度为9.67mm/s。
This study shows that under the premise of meeting the mechanical performance index, the most significant factor affecting the substrate density gradient of 7 mm floor substrate is the hot pressing temperature, followed by the hot pressing pressure, the closing speed of the pressing plate, the pressing time and the fiber moisture content. The optimum process of the flat density gradient curve of 7 mm floor fiberboard substrate was 170 ℃ for hot pressing, 182 s for hot pressing, 7 MPa for hot pressing, 8% for fiber and 9.67 mm/s for platen closure. With the increase of the hot pressing temperature, the density ratio of the core of the watch increases, over 165 ℃, the temperature continues to rise,the density ratio of the watch core decreases and the VDP curve changes to a flat type. With the increase of the closing speed of the pressure plate, Under the same conditions, the increase of hot pressing pressure will increase the density ratio of the core layer of the floor base material and the density of the core layer will decrease. The hot pressing is longer, the plate surface density ratio is smaller. It is easier to fabricate a flat-typed density gradient floor base material; the initial water content of the slab is the larger, the core-layer density ratio is the higher, the core density is the lower and the steep change in the VDP curve. According to the experimental results, the optimum scheme of optimal density gradient distribution is 170℃ for hot pressing, 182 s for hot pressing, 7 MPa for hot pressing and 8% for fiber and 4.14 mm/s, the platen is under optimum density gradient distribution conditions, the maximum internal bonding strength is 160℃, hot pressing time 238 s, hot pressing pressure 7 MPa, initial moisture content 10% and plate closing speed 9.67 mm/s.
作者
孙维宏
尹铁元
高金贵
李风华
郭旭光
SUN Wei-hong1, YIN Tie-yuan2, GAO Jin-gui3, LI Feng-hua1, GUO Xu-guang2(1.Changbai Mountain Forest Industry Group Hunchtm Forest Hill Wood Co., Ltd.,Hunchun 1333000, China; 2.Jilin Xinyuan Wood Co., Ltd.; 3.BEIHUA University, Jilin 132013, Chin)
出处
《木材加工机械》
2018年第1期18-24,共7页
Wood Processing Machinery
基金
中央财政林业科技推广示范项目:HDF(高密度)实木复合地板加工技术推广示范(吉[2012]05号)
低温热处理三层实木地板技术推广示范([2013]T J Q01号)
易拆装地砖地板推广示范(吉推[2014]04号)
聚酯饰面三层实木复合地板推广示范(JLT[2015]07号)
三层难燃地板科技成果推广示范(JLT[2015]08号)
三层实木复合框架结构地板新型复合结构地板加工技术推广示范(JLT[2016]4号)
吉林省重点科技成果转化项目:三层实木复合框架结构地板新型复合结构地板成果转化项目(20160307025NY)
国家自然科学基金:基于时间序列分析带锯条裂纹和掉齿产生和发展机理与预报的研究(31570556)
关键词
地板基材
纤维含水率
热压参数
密度梯度
floor substrate
fiber moisture content
hot press parameter
density gradient
