共查询到20条相似文献，搜索用时 203 毫秒
1.
2.
竹木复合定向刨花板强度性能研究 总被引：1，自引：0，他引：1
本文论述了竹材、意大利杨复合定向刨花板的强度性能,就胶种、刨花厚度、竹材所占比率、板密度、板坯结构、施胶量等诸因子对板材强度性能的影响进行了探讨。结果表明:(1)胶种对竹木复合定向刨花板的强度影响不大;(2)降低刨花厚度或提高板密度均可使板材强度提高;(3)单层结构的复合定向刨花板强度最高;(4)提高板材中竹材的比率可使板子强度明显改善;但竹材比率过高时,板材强重比反而下降,呈开口向下的抛物线型变化;(5)酚醛树脂定向刨花板的强度随原料酸性增大而降低。 相似文献
3.
国外定向刨花板行业状况
根据《LY/T1580-2010定向刨花板》的定义：定向刨花板（Oriented strand board,OSB）是由规定形状和厚度的木质大片刨花施胶后定向铺装,再经热压制成的多层结构板材,其表层刨花沿板材的长度或宽度方向定向排列。 相似文献
4.
浙江良友木业有限公司 《国际木业》2014,44(9):72-74
OSB（Oriented StrandBoard）板又称定向刨花板,国内也叫其为欧松板。在欧美国家,被广泛应用于建筑、室内装修、家具生产等方面。
企业概况
浙江良友木业有限公司成立于2003年,早期主要从事木材板材方面的进出口贸易,对木材特别是人造板方面的发展和应用比较关注。美国HUMBER集团成立于1883年,公司旗下的定向刨花板品牌——＂ADVANTECH＂,是利用北美丰富的黄杨、松木等木材资源,采用环保的MDI异氰酸酯胶粘剂和先进的设备及工艺所生产,产品具有良好的理化性能。 相似文献
5.
6.
木塑复合工艺因子对复合材料性能的影响 总被引：11，自引：1，他引：11
选用2种人工林木材(马尾松与杨木)和3种废弃塑料(聚乙烯、聚丙烯及聚苯乙烯)为原料,采用木材与塑料冷混-热压工艺,通过正交试验研究不同树种、木材组元形态、补强剂、塑料种类、板材密度及不同木塑混合比等复合工艺因子对木塑复合材料性能的影响.结果表明树种、木材组元形态、塑料种类、木塑复合比例、板材密度与补强剂等复合工艺因子对木塑复合材料性能有不同程度的影响;提高塑料在木塑复合材料中的比例也可以达到与添加酚醛补强剂同样或更好的结果;以杨木原料、细长刨花形态、聚丙烯塑料、板材密度为1g*cm-3等为最佳复合工艺因子,制成的复合材料性能达到或超过相关普通刨花板,包括室外结构用刨花板性能指标. 相似文献
7.
介绍了一种单板条双向定向重组装饰木板的制造方法。采用该法制成的重组木板是由多条厚度为0.5~5mm、宽度为10~100mm、长度不限的单板条以宽面倾斜贴合并经施胶固化而成的板材;板材中单板条的长度方向与板材长度方向大致相同,单板条的宽度方向与板材的板面相交成15°~85°的夹角。该重组木板的制备工艺包括:1)单板制备;2)单板条制备;3)单板条端头加工;4)单板条干燥;5)单板条施胶;6)单板条陈化;7)双向定向组坯;8)压固成型;9)毛坯板材加工处理。采用该法制成的重组木板材表面具有类似于天然木材表面的条带状花纹,具有很好的装饰效果,可直接用于地板、家具面板和建筑装饰面材等领域。 相似文献
8.
9.
10.
11.
Three-layered composite oriented strand boards were manufactured using very thin hinoki (Japanese cypress, Chamaecyparis obtusa Endl.) strands oriented in the faces and mixtures of sugi (Japanese cedar, Cryptomeria japonica D. Don.) and hinoki particles in the core. The boards were composed of two density levels, with 1:8:1, 0.5: 9 : 0.5, and 0: 10 : 0 face: core: face ratios. Polymeric and emulsion type isocyanate resins were used. The resin contents for the strands in the face and particles in the core were 10% and 5%, respectively. The steam-injection press was applied at 0.62MPa (160°C), and the steam-injection time was 2min. The mechanical and physical properties of the boards were evaluated based on the Japanese Industrial Standard. The parallel moduli of rupture and elasticity along the strand orientation direction and the wood screw retaining force increased with increasing face/core ratios. Incorporation of 10%–20% of thin strands in the face of the boards improved the parallel moduli of rupture and elasticity by 47%–124% and 30%–65%, respectively. In addition, the thickness swelling after water-soaking at 20°C for 24h, and the parallel linear expansion after boiling for 2h and water-soaking at 20°C for 1 h, of the three-layered composite boards were below 8% and 0.15%, respectively, despite a short steam-injection press time. The thickness swelling of the boards decreased with increasing face/core ratios. In contrast, the presence of face strands seems to have a minimal effect on the moduli of rupture and elasticity along the perpendicular direction of the three-layered composite boards. A similar trend was observed for the internal bond strength, hardness, and linear expansion along the perpendicular direction.This paper was presented at the 47th annual meeting of the Japan Wood Research Society, Kochi, April 1997 相似文献
12.
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
13.
Development of high-performance strand boards: engineering design and experimental investigations 总被引：1，自引：0，他引：1
Reinhard Stürzenbecher Karin Hofstetter Thomas Bogensperger Gerhard Schickhofer Josef Eberhardsteiner 《Wood Science and Technology》2010,44(1):13-29
Strand-based engineered wood products such as oriented strand boards enjoy great popularity in structural engineering and
are widely used for a variety of applications. To strengthen their competitiveness and to enlarge their range of utilization
particularly in the load-bearing sector, the mechanical properties of these products need to be improved. This motivated the
research efforts to use large-area, slender veneer strands for the production of strand boards with increased stiffness and
strength. Target-oriented development of these products requires comprehending the effects of the relevant (micro-)characteristics,
such as wood quality, strand geometry, and strand orientation and compaction during the production process, as well as layer
assembly and density profile, on the mechanical properties of the finished strand boards. Comprehensive test series, in which
these effects on tension, bending and shear properties of the boards have been studied individually, are presented in this
paper. The obtained results provided insight into the microstructural load-carrying mechanisms and, thus, yielded valuable
knowledge for product optimization and further improvement of custom-designed strand-based engineered wood products. 相似文献
14.
Randomly oriented strand boards with both uniform and conventional vertical density profiles (VDP) were manufactured, and their properties were evaluated and compared. The bending modulus of elasticity (MOE) of conventional strand boards was predicted using the laminated beam theory and the MOE-density regression equation from the uniform strand boards. The results showed that the predicted MOE of conventional strand boards was close to the measured MOE with a difference of less than 10%. The internal bond strength values of uniform strand boards were found to be higher than conventional strand boards while no significant difference was found in water-related properties. Compared with uniform strand boards, MOE values of conventional strand boards were improved only at higher density level. About 10% of improvement in MOE can be obtained for the strand boards investigated by manipulating the VDP. Steeper VDPs were predicted to be required for thinner boards than for thick boards in order to achieve the same improvement in MOE. 相似文献
15.
Fauzi Febrianto Sahroni Wahyu Hidayat Edi Suhaimi Bakar Gu-Joong Kwon Jin-Heon Kwon Soon-Il Hong Nam-Hun Kim 《Wood Science and Technology》2012,46(1-3):53-62
Bamboo has gained increasing attention as an alternative raw material for use in the manufacture of composite boards. Three-layer OSBs were made using Betung bamboo (Dendrocalamus asper (Schultes.f) Backer ex Heyne) strands to evaluate the effects of strand length and pre-treatment techniques on the physical, mechanical, and durability properties. Three different strand lengths, namely 50, 60, and 70?mm, were prepared. Prior to the manufacture into OSB, the strands were immersed in cold water for 24?h and in 6% acetic anhydrides solution for 48?h. The OSBs were fabricated using 5% MDI resin based on the strand dry weight. The results indicated that MOR and MOE values in perpendicular to the grain direction were much influenced by strand length. The dimensional stability of OSB was slightly improved by immersing the strands in acetic anhydride solution. Immersing strands in cold water and acetic anhydride solution improved the resistance of OSB against subterranean termite (Macrotermes gylvus) attack under the adopted experimental condition. All OSB parameters manufactured in this experiment were better than the minimum requirement of CSA 0437.0 (Grade O–2) standard. 相似文献
16.
17.
Reinhard Stürzenbecher Karin Hofstetter Gerhard Schickhofer Josef Eberhardsteiner 《Wood Science and Technology》2010,44(2):205-223
The interrelationships between microstructural characteristics and anisotropic elastic properties of strand-based engineered
wood products are highly relevant in order to produce custom-designed strand products with tailored properties. A model providing
a link between these characteristics and the resulting elastic behavior of the strand products is a very valuable tool to
study these relationships. Here, the development, the experimental validation, and several applications of a multiscale model
for strand products are presented. In a first homogenization step, the elastic properties of homogeneous strand boards are
estimated by means of continuum micromechanics from strand shape, strand orientation, elastic properties of the used raw material,
and mean board density. In a second homogenization step, the effective stiffness of multi-layer strand boards is determined
by means of lamination theory, where the vertical density profile and different layer assemblies are taken into account. On
the whole, this model enables to predict the macroscopic mechanical performance of strand-based panels from microscopic mechanical
and morphological characteristics and, thus, constitutes a valuable tool for product development and optimization. 相似文献
18.
Effects of strand length and layer structure on some properties of strandboard made from bamboo 总被引：1，自引：0，他引：1
Strandboard panels were experimentally produced from moso bamboo (Phyllostachys pubescens) using various strand lengths and layer structures to evaluate the effects of manufacturing parameters on panel properties.
The strandboard was fabricated in a laboratory using diphenylmethane diisocyanate (MDI) resin and laboratory-made strands
of four lengths and four different structures. Strand alignment distributions and concentration parameter (k) values were greatly affected by strand length. A linear correlation was found between the value of k and the modulus of rupture (MOR), with correlation coefficients of 0.81 and 0.93 for unidirectional boards and three-layer
boards, respectively. This correlation may be used to predict the strength properties of boards. Bending properties were significantly
affected by both the strand length and the layer structure of the bamboo strandboard tested. Elasticity data from unidirectional
boards and random boards can be used to predict the elastic properties of three-layer boards. The linear expansion (LE) of
the random boards increased with decreasing strand length. The difficulty in mat forming and resin distribution for longer
strands could cause deviation in modulus of elasticity (MOE) and LE, especially in strand lengths around 80 mm. 相似文献
19.
采用成熟的竹木复合集装箱底板制造工艺,根据不同的组坯方式,用竹帘及杨木单板压制成竹木复合板和竹木复合层积材。该工艺的创新点在于只将杨木单板浸胶,而竹帘直接干燥铺装,以减少人工操作对竹帘的破坏。通过研究两种板的抗弯性能,发现其顺向抗弯性能非常好,可将其分别作为集装箱底板和建筑结构用材。此外,针对竹木复合板性能不稳定的问题提出了改进方案。 相似文献
20.
This study investigated the effects of mild steam treatment (0.1 MPa for 2 h) of natural bio-based fibers and orientation
(0° and 90°) of those fibers in various fiberboards. Ramie bast, pineapple leaf, and sansevieria fiber bundles were used as
materials. The composite fiberboards were prepared using phenol-formaldehyde (PF) resin. To investigate the effect of mild
steam treatment on wettability, contact angles of PF resin to the fiber were measured. The mechanical properties of the boards
were examined as well as their dimensional stability. The contact angle data showed that mild steam treatment was effective
in improving the wettability of fibers. Unioriented steam-treated boards showed better performance of internal bond (IB),
moduli of rupture (MOR) and elasticity (MOE), thickness swelling (TS), and water absorption (WA) than other boards. Unioriented
steam-treated sansevieria board with longitudinal fiber direction showed higher average values of MOR (403 MPa), MOE (39.2
GPa), and IB (1.33 MPa) and lower values of TS (5.15%) and WA (8.68%) than other boards. The differences in the mechanical
properties and dimensional stability of boards were found mainly due to the differences in the ratios of fiber fraction of
the boards to the density of the fiber bundles. 相似文献