木丝杆定向层积材试制与前景展望

提出木丝杆定向层积材概念,研究以木丝杆为单元制造重组木。采用两种不同规格木丝杆单元和不同铺装方法制作木丝杆定向层积材并进行性能测试,结果表明:增加木丝杆长度有助于提高板材抗弯弹性模量;随机定向铺装的板材抗弯强度优于砖墙式定向铺装。     

重组木制造技术的试验研究

重组木制造技术的试验研究金维洙，马岩，蔡立新，杨家武，孟庆军（东北林业大学哈尔滨１５００４０）重组木是利用小径级劣质木材、间伐材和枝丫材经辗搓设备加工成横向不断裂、纵向松散而又交错相连的大木束木材，再经干燥、铺装、施胶和热压或模压制成的，这项技术的出...     

工艺因子对杨木碎单板PSL材性变异性的影响

利用杨木碎单板制造PSL,考察板密度、板厚度、单板条长度以及铺装方式对PSL材性变异性的影响。研究表明,材性变异性均随板密度、板厚度的增大而减小,随单板条长度的增大而增大,铺装方式的影响中平行定向铺装时最小,定向抛洒铺装稍大,≤30°角铺装时最大。各项工艺因子对顺纹抗压强度变异性的影响均较小。对工艺因子影响下的力学强度进行可靠性分析,得出PSL安全系数为:MOE 2.4~5.149;MOR 3.229~8.401;顺纹抗压强度1.131~1.54。     

单板条平行成材(PSL)研究现状及发展趋势

单板条平行成材(PSL)是由窄单板条沿木纤维长度方向定向成型的一种新型木质复合材料。PSL可用生产单板层积材(LVL)或胶合板的剩余窄小单板做原料,单板条涂饰胶粘剂,按轴向排列方式连续送入成型槽进行规格铺装,铺装成型的板坯再持续送入具有微波处理功能的压机,经四面挤压制成大幅面的PSL,最后锯解成要求的规格尺寸。由于单板条的随机铺装,单板条中的天然缺陷如节子、斜纹和幼龄材等分散在板坯中,使PSL的力学性能更加均匀稳定。     

OSB地板的开发与市场前景分析

定向刨花板（oriented steand board）英文缩写为OSB,是用小径原木经长材刨片加工得到的薄长刨花为基本木质单元,施加胶黏剂和其他添加剂后,通过定向铺装、热压制得的一种人造板材。生产该产品,可将小径木、枝桠材、等外材等低质木材原料加工成强度高、刚性大的结构用板材,能充分利用资源,使伐区的枝桠树头、造材截头得到了充分的利用,减少损失和浪费。     

沙柳材重组木——沙生灌木的又一有效利用途径

沙柳材重组木SalixmongoliaScrimber开辟了沙生灌木的又一有效利用途径,它是将内蒙古自治区西部地区的沙柳材经辗压、干燥、施胶、铺装成型、热压及后期处理等工序而获得的一种新型结构材料。本文简单介绍了沙柳材重组木的加工工艺,针对沙柳材的生长特性和沙柳材重组木的加工特点和优良性质,分析探讨了开发研制沙柳材重组木的重要意义及其发展前景。     

家具用新型材料—重组木

重组木(Scrimber)是80年代由澳大利亚首创的一种新型人造实体木材,它是将速生小径材、枝丫材及制材边角料等廉价低质材料经备料、辗搓加工、干燥、施胶、铺装成型、热压及后期处理而获得的一种新型结构材料。本文简单介绍了重组木的加工艺,针对重组木的加工特点和优良性质,分析探讨了重组木在现今家具工业中的应用特性和发展前景。     

单板木束复合板主要物理力学性能的试验研究

通过试验研究了单板木束复合板的主要物理力学性能;分析了单板条的宽度、接头形式对芯板性能的影响。研究结果表明,单板木束复合板具有良好的物理力学性能,是天然木材或胶合板等人造板材的替代品。     

小径木刨切单板纤维化处理设备整机结构设计

为突破传统重组木木束单元偏大、纤维形态不规则、疏解程度不均匀的缺陷,研发了一种能生产较小木束单元的纤维化疏解设备。在对现有疏解设备结构形式及工作原理进行分析的基础上,确定了小径木刨切单板纤维化处理设备的主要技术参数,完成了小径木刨切单板纤维化处理设备的结构组成设计,对机架、疏解机构等进行了合理设计和布局安排,其中包括疏解辊直径、辊齿参数、辊齿配置及微调装置的设计。采用该设备生产的纤维化单板具有纵向纤维不断裂、粗细较均匀的特点,且纤维束的宽度基本分布在1~3 mm,以该纤维化单板为基本单元制成新型重组木,能够得到不同性能指标的产品。小径木刨切单板纤维化处理设备是生产新型重组木的重要设备之一,可为制备新型重组木产品提供优质的原材料。     

新型结构用材—纵向定向木材（PSL）

纵向定向木材(PSL)是将木条经施胶、定向铺装、热压等而制成的高强度结构材。本文介绍了定向木材的生产工艺、产品性质和特点及其应用。     

酚醛树脂制造竹定向刨花板的工艺探讨

竹定向刨花板(BOSB)是将窄长竹刨花经过施胶、定向铺装和热压而成的一种多层结构板材.通过测定竹刨花形态、施胶量、热压工艺等因素对BOSB性能的影响,探索制造BOSB的较佳工艺条件.采用本试验确定的工艺参数试制的样板,主要性能指标可满足林业标准中木质OSB/3类一级品的要求.     

Image analysis and bending properties of model OSB panels as a function of strand distribution,shape and size

The technique of image analysis has been used to assess the quality of model oriented strand board panels by investigating the relationships between shape and size of strands, the distribution of strands and bending properties. A batch of commercial strands was analysed by image analysis and the distribution of the shape and size of strands was quantified. The strands were categorised into five strand types as a function of size and aspect ratio. In general, strand shapes were observed to be mostly rectangular and there was also a wide variation in strand dimensions in commercial material. Bigger area strands had low aspect ratios and small strands had high aspect ratios. Half of the commercial strands were longer than 100 mm.Model OSB panels were manufactured in the laboratory by hot pressing strand mats formed from each of the five strand types. Strands were laid up by hand into the forming mat and following pressing the orientation and shape of strands was evaluated by image analysis and the panels were tested in a three point bending. Large area (type 3) strands with high aspect ratios produced model panels with optimum strand orientation and mechanical properties.Type 3 panels were also fabricated from strands dropped through a slotted forming device in order to simulate the delivery of strands to the forming line under factory conditions. As the height of strand delivery increased from 0 to 100 to 200 mm the disorientation of strands in the pressed panels progressively increased and as a result mechanical properties in bending were reduced.Image analysis is therefore a powerful tool for evaluating the distribution of commercial strand shapes and the relationship between strand geometry, strand orientation and the mechanical properties of oriented strand board.     

浅谈小坪森林公园经营模式的构想

小坪森林公园是大众化经济度假型旅游区 ,可沿用“一套班子 ,两块牌子”的管理体制 ,并组建小坪森林旅游公司 ,其收入由门票、管理费和景观租赁费构成。应多渠道争取投资 ,以会员制的形式吸引事业性投资 ,出让土地建房和营造纪念林 ;以出租景观的形式吸引经营性投资 ,由开发商投资服务、娱乐、交通等设施 ,并负责经营     

A continuum model of the interaction between manufacturing variables and consolidation of wood composite mats

Wood composites produced using aspen flakes have displayed interaction between manufacturing variables and stress-strain consolidation of these mats. This study brings an original approach to the process of wood composites within the analytical nonlinear continuum mechanics based model, developed to predict the consolidation of wood mats during part of the hot-pressing cycle. Consolidation of wood flake mats occurred principally during the closing of the press when the loose mat underwent uniaxial compression along its perpendicular direction. Forming parameters such as mat thickness, and pressing parameters such as press closing rate, were accounted for in a combined viscoelastic model with creep. The stress-strain consolidation model was applied to different formed mat structures using random and oriented layout of flakes, and although slightly higher values were obtained with the model regarding the viscoelastic behavior of the loose mat, the creep model showed a very good agreement with the experience data. These results within a continuum approach, are significant in the manufacturing of wood composites as they would enable optimization of manufacturing processes by integrating the specific conditions of the forming process of wood mats into the pressing strategy.This project is financially supported by a Natural Sciences and Engineering Research Council of Canada Strategic Grant (STR 0167246).     

杉木萌芽林林冠下营造木荷后土壤肥力状况的研究

通过对杉木萌芽林林冠下营造木荷后形成的混交林土壤肥力变化的测定与分析表明：与杉木纯林相比，混交林凋落物量较多，且易于分解，灰分养分较为丰富，土壤有机质含量较高，土壤结构稳定性好，土体疏松多孔，养分贮量大，供肥能力较强，这表明杉木萌芽林经改造形成稳定的混交林后土壤肥力状况有较大程度的改善。     

基于生态弹性的北京市“二道绿隔”温榆河段郊野公园设计

生态弹性通过研究人与自然系统的关系,为缓解生态危机、建设美丽中国提供了新的视角。文章以北京市"二道绿隔"温榆河段的郊野公园组团为例探讨生态弹性导向下的郊野公园体系设计策略:一是从缓解河道行洪压力、形成区域海绵系统、公园水网循环建设3方面构建弹性水系统;二是通过推进适应性生态演替与设计旱雨两宜生境构建弹性生境系统;三是构建生态游览系统。     

广元市林业生态经济产业发展研究

在现状调查的基础上，分析了广元市林业生态经济产业发展存在的主要问题，提出了林业生态经济产业发展的基本思路、对策与建议。     

果实套袋生产的机制及操作规程

果实套袋是生产绿色果品的关键技术措施之一。机制是套袋影响果实花皮素苷的形成、含量与分布，并就套袋与除袋的时期、方法、套袋前后的树体管理作了详细说明。     

引导孔孔径对塑木构件结构强度影响

塑木复合材料作为一种新型材料,其螺钉连接能否沿用木材或人造板材料的连接方式尚有待于研究.而引导孔孔径是影响木材和人造板材螺钉连接强度的重要因素,本文通过对塑木复合材料的握钉力和L型构件结构强度的测试,得出塑木构件螺钉连接强度的最佳引导孔孔径.     

浅论惠州西湖景观文化内涵及特色

惠州西湖丰富的自然和人文景观积淀了深厚的文化底蕴,形成了独特的景观文化内涵并成为其发展的灵魂,体现着具有中国古典风景园林显著特征的观赏型风景名胜区独特的文化价值。