共查询到19条相似文献，搜索用时 296 毫秒
1.
2.
分别用氢氧化钾和亚氯酰钠处理木材原料，以移去木材原料中的一部分半纤维素和木素。些特制浆料压制的无胶纤维板，无论是板的经度性能还是板的耐水性能都比未处理木材原料制造的无胶纤维板的性能有明显的下降。这一结果表明，木材原料中的半纤维素和木素都对纤维间自生胶粘因素的形成具有重要意义。 相似文献
3.
非木材植物纤维原料人造板 总被引：3，自引：1，他引：2
本文阐述了在中国发展非木材纤维原料人造板的意义,介绍了中国林科院木材工业研究所近年来开展的利用竹材、亚麻屑、蔗渣、棉秆、葵花秆、麦秸、谷秸、玉米秸、芦苇、豆秸和烟秆等非木材纤维原料制造刨花板、中密度纤维板和硬质纤维板的研究工作。结果表明,上述非木材植物纤维原料适于制造人造板,这些人造板在很多场合可以替代木材人造板使用,因而,在中国发展非木材植物纤维原料人造板具有广阔前景。 相似文献
4.
5.
木纤维与麦秸刨花制造纤维刨花板的工艺研究 总被引：4，自引：0，他引：4
对以木纤维及麦秸刨花为原料制造纤维刨花板的制造工艺及板材性能进行了研究。结果表明，利用木材及麦秸原料制造纤维刨花板的工艺可行，板板的性能完全可以达到中密度纤维板国家标准的要求。 相似文献
6.
7.
<正> 一、纤维板施加防水剂的机理纤维板是由木材或其它纤维原料经过分离再重新组合成的人造板,虽然在生产过程中木纤维的组织结构已重新排列,物理化学性质发生了某些变化,但木材纤维的亲水性和木纤维细胞壁的化学组成并没有改变,因此纤维板与木材一样具有吸湿和吸水性能. 为了降低纤维板吸湿和吸水作用,提高使用价值,在生产过程中必须施加防水剂,常用的防水方法是在浆料中加入憎水物质,应用最多的是石蜡.其防水机理系石蜡乳化后 相似文献
8.
1概述鞍山刨花板厂于1991年通过对现有湿法纤维板设备的改造，设计出既能生产普通硬质纤维板又能生产湿法中密度纤维板的多功能生产线．由于湿法生产中密度纤维板工艺还在研究和发展阶段，所以本文着重探讨湿法中密度纤维板的设计方案和生产工艺。湿法中密度纤维板（简称MDF）生产工艺是基于利用木材或其它植物纤维原料中的木责成份在高温下塑化融溶将本纤维等组份自身地合，利用纤维素、半维素中所含的羟基形成氢键结合力，利用少量的热固性木材胶粘剂，进一步形成化学结合力，从而牢固地把木纤维胶合成一体。因此，它可以通过湿法成型，… 相似文献
9.
黄锦林 《林业机械与木工设备》1981,(5)
最近,苏联里沃夫林学院为了证明利用锯屑生产木质纤维板的可能性,在一个木材综合企业进行了试验。纤维板的原料是该企业生产中所收集的锯屑。以锯屑的粒度组成和木质纯切削度,衡量原料质量的均匀程度。规定沿纤维方向的木质颗粒长度、纤维构造和破裂程度,为评价木质纤维板原料锯屑的标准。 相似文献
10.
杨柴木材的构造,纤维形态及其化学成分的分析研究 总被引：3，自引：0，他引：3
本文对杨柴木材的显微结构、纤维形态和化学成分进行了测定与分析，研究结果表明，杨柴材木纤维所占比率较多，纤维形态好，综纤维素含量高，是替代针，阔叶乔木树材制造刨花板的纤维板的优良原料。 相似文献
11.
利用微米木纤维定向重组技术形成超高强度纤维板的细胞裂解理论研究 总被引：15，自引：4，他引：15
采用人造板微观力学和木材细胞学理论，提出了一种利用定向重组微米木纤维技术形成超高强度人造板的细胞裂解理论和强度参数预测方法。应用提出的理论，可以根据纤维、木质素、细胞直径和排列的程度，建立理想状态下微米重组高强度定向纤维板木纤维细胞在定向重组微米技术形成超高强度人造板的细胞裂解理论，为人造板力学运用数学手段深入到细胞结构研究的深度提供了一种新的理论和方法。 相似文献
12.
Abdel-Baset A. Adam Houssni El-Saied Mahmoud K. Soliman 《Wood material science & engineering》2014,9(1):49-57
Sesbania fiber is a fast-growing wood species that has been investigated for medium-density fiberboard (MDF) production. To assess the possibility of applying the local industrial defibration parameters of sugar-cane bagasse (SCB) on defibration of sesbania, the chemical constituents of unfibrated and defibrated sesbania, as well as their thermal stability and scanning electron micrographs, were estimated. Different preparation variables of MDF, such as density, level of urea-formaldehyde (UF) resin (with 0.19% free-formaldehyde [HCHO]), and pressing time were studied, in comparison with that produced by using SCB fibers. The results showed that most of the tested sesbania-based MDFs have mechanical properties that fulfill the minimum requirements of MDF ANSI standard. Additionally, applying 12% UF and pressing for 240 sec provided sesbania-based MDF with optimum reduction in thickness swelling (reached ～7%). It is important to note that the sesbania-based MDF produced under these conditions is characterized by a lower TS property, than that obtained from SCB, or that reported in standards. The preliminary feasibility study revealed that using sesbania fibers will be an added economical potential for MDF production. 相似文献
13.
Oliver Mertens Kim C. Krause Matthias Weber Andreas Krause 《Wood material science & engineering》2020,15(2):114-122
ABSTRACTThermomechanical wood fibers, as usually used for medium density fiberboard or cardboard production, feature promising characteristics, like a high aspect ratio, for the utilization in thermoplastic composites. The present study investigates the influence of fiber loading and fiber geometry on the mechanical properties of wood-polypropylene composites in order to confirm the results that were found in a previously published literature review. Composites were compounded at fiber contents from 20 to 60 wt.%, using a co-rotating twin-screw extruder and subsequently injection molded to test specimens. Field emission scanning electron microscopy was carried out to evaluate the fracture morphology of the composites. Fiber length was evaluated using an applying a dynamic image analysis system. Compounding reduced fiber lengths up to 97%. The mechanical properties decreased with increasing fiber content for composites without a coupling agent. Strength properties peaking at a fiber content of 50?wt.% for composites containing MAPP. Tensile strength and flexural strength reached 48.1 and 76.4 MPa, respectively. However, it was found that the processing of these fibers into conventional compounding equipment is still challenging. 相似文献
14.
以中密度纤维板为基材,通过设计穿孔结构及打孔方式,达到拓宽木质穿孔板吸声频带和提高声学性能的目的。利用分层加工工艺制备了带侧孔结构的穿孔纤维板,采用阻抗管传递函数法对穿孔纤维板吸声性能进行了测试。通过正交试验方法,研究了主孔直径、穿孔率、倾斜角度对穿孔纤维板吸声性能的影响,并获得了较优的制备工艺,随后利用控制变量法研究了侧孔深度对穿孔纤维板吸声性能的影响。试验结果表明:影响穿孔纤维板吸声系数峰值的因素主次顺序为倾斜角度>主孔直径>穿孔率;穿孔纤维板获得良好吸声系数峰值的优选工艺参数为主孔直径3 mm、穿孔率3.14%、倾斜角度30°;增加侧孔结构后,穿孔纤维板在中低频、中高频均表现出良好的吸声特性;侧孔深度对穿孔纤维板中高频共振频率和吸声性能影响较大,当侧孔深度为4 mm时,仿生木材结构穿孔纤维板在中高频段共振频率为3632 Hz,吸声系数峰值可达0.67。本研究为穿孔吸声板的结构设计提供参考,解决了复杂孔型加工的技术难题,对多频段吸声木质穿孔板的工业化应用具有重要意义。 相似文献
15.
16.
Yoichi Kojima Ayaka Kawabata Hikaru Kobori Shigehiko Suzuki Hirokazu Ito Rie Makise Masaki Okamoto 《Journal of Wood Science》2016,62(6):518-525
Wood-based materials are fabricated with adhesives composed of various materials derived from fossil fuels. It is difficult to identify replacements for these chemical adhesives. This study explored nanofiber technologies as an alternative to these adhesives. In this study, we focused on reinforcement effects of lingo-cellulose nanofiber (LCNF) on fiberboards made from softwood and hardwood fiber. We discuss the density effects of reinforcement with LCNF because the density of medium-density fiberboard (MDF), which is widely used for construction, is standardized at about 0.60–0.80 g/cm3. Fiberboards were manufactured with three densities (0.60, 0.75, and 1.00 g/cm3). For softwood fiberboards, the bending properties for LCNF-mixed boards were higher than those for the control fiberboards at all densities. In this paper, control fiberboard means fiberboard with fiber only. For hardwood fiberboards, the bending properties for LCNF-mixed fiberboard for 1.00 g/cm3-density board were higher than those for the control fiberboard. For internal bond strength (IB), the IB for LCNF-mixed fiberboard was higher than that for the control fiberboard. The thickness swelling (TS) and weight change (WC) with water absorption for fiberboards containing LCNF were lower than those for control fiberboards. As a conclusion, physical and mechanical properties of the resulting fiberboards were significantly improved with the addition of LCNF, especially for softwood fiberboards, due to close binding between LCNF and wood fibers. 相似文献
17.
18.
19.
杨树是我国重要的速生树种,也是作为造纸等工业原料的重要树种。生长量是杨树的重要性状指标,但除此之外,容积密度和纤维长等在材性上表现较佳的优良品种的培育也越来越受到社会的关注。中国的杨树材质研究过去大多都只一味地注重和研究与材性有关的性状,此次我们利用多个性状求出了选择指数,然后初步选择了生长量较好,且容积密度等材性性状也表现良好的无性系。调查对象为湖北省石首市原种场内栽植的13a生中天1号、中天4号、中潜1号、中监1号等13个无性系。调查项目为胸径及容积密度、纤维长、弹性模量等材性性状.参试株数为每个无性系16株(1个小区4株,重复4次)共208株。采用“日本林木育种中心”开发的方差分析软件Lsab02和Lsab21求出了最小二乘推定值,对无性系进行了评估,并利用胸径、容积密度、纤维长等性状求出了选择指数,初步选择出了生长和材质上均表现较佳的优良无性系。 相似文献