Dimensional stability of OSB made from acetylated Fir strands

Picea abies ) ring-cut strands were acetylated by reaction with acetic anhydride at 120 °C for periods of 30 and 60 minutes. The results indicated a weight gain of 11.2% and 20.4% respectively. Treated and untreated strands were used to form laboratory boards, which were tested in accordance with EN standards. Boards made from these acetylated strands exhibited significantly lower thickness swelling and water absorption when compared with the control. The internal bond strength (IBS) of test boards was significantly lowere (−19%), but still within International standards, than the control boards, and failure was due to resin bond failure. This would suggest that lower resin dosing could partially offset acetylation costs in industrially produced boards. Finally, we observed that boards made with acetylated strands were less compressible than the control boards.

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谈谈定向结构板的专用主机设计

本文介绍了生产定向结构板的专用主机（包括刨片机、干燥机、分选机、拌胶机和定向铺装机）的设计指导思想与注意事项。对照安装在福建建瓯木材厂的全国第一条国产化定向结构板生产线，给出了各个专用主机的主要技术参数     

定向结构刨花板在建筑中应用的预测分析

本文讨论定向结构刨花板的性能特点及其在房屋内隔墙建筑模板、壁橱和门等方面的应用     

A constitutive model for OSB and its application in finite element analysis

Experiments were conducted to determine some of the material properties of OSB. Tests covered three in-plane board directions and the through thickness direction. Results showed that OSB is an orthotropic material with better material properties in the direction of strand orientation. OSB in tension behaves almost linearly up to failure, whilst in compression it exhibits plasticity. This plasticity needs to be taken into account in nonlinear finite element analysis in order to simulate the structural behaviour of OSB appropriately. An elasto-plastic constitutive model for OSB in compression was established, based on the statistics of test results. The model was used in the FE simulation of a load test on a compression specimen and a nonlinear buckling analysis of an OSB webbed timber I-beam. The close prediction of behaviour of both specimens was considered to act as validation of the proposed constitutive model.

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Ein grundlegendes Modell für OSB und seine Anwendung in der FE-Analyse

Zusammenfassung Versuche zur Bestimmung einiger Materialeigenschaften von OSB wurden durchgeführt. Die Versuche umfassten Prüfungen in drei Richtungen der Plattenebene, sowie eine Prüfung quer zur Plattenebene. Die Ergebnisse zeigten, dass OSB ein orthotropes Material mit besseren Materialeigenschaften in Richtung der Spanorientierung ist, während es sich bei Zugbeanspruchung hingegen plastisch verformt. Dieses plastische Verhalten muss bei nicht-linearen Berechnungen berücksichtigt werden, um das Festigkeitsverhalten von OSB richtig zu simulieren. Auf Grundlage der statistischen Versuchsergebnisse wurde ein elasto-plastisches Modell für OSB unter Druckbeanspruchung entwickelt. Das Modell wurde für die FE-Simulation eines Druckversuches und eine nicht-lineare Knickberechnung eines I-Balkens mit OSB-Steg verwendet. Die gute Übereinstimmung der Ergebnisse in beiden Fällen bestätigte die Eignung des Modells.

     

定向刨花板半机械化生产设备的研究与设计

定向刨花板是一种性能良好的结构板材。为了利用胶合板生产的废单板生产定向钊花板,我们研制了半机械化生产定向刨花板的设备。     

家具用新型饰面定向刨花板性能研究

就饰面用特制定向刨花板的生产工艺、性能特点等进行了详细介绍,并就该产品在家具设计与制造、室内装修领域进行探讨,以增加室内和家具设计师、消费者等对饰面定向刨花板的认识了解。     

定制的暗香涌动

北京、深圳、沈阳、香港,定制的暗香涌动。不约而同地,首饰定制成为了很多企业正在开展的业务。没有明显的征兆,没有标志性的事件,一些传统的首饰加工企业、零售店,增设了定制业务。例如以珠宝加工为主营业务的TTF、在沈阳经营首饰零售业的鑫奉珠宝等。各地市场和经营者大多流露出两个共同点:首先,市场中的定制需求存在,一些企业适时推出了这项业务;其次,怀有原创梦想的业者,向定制业务投入了更多精力。     

面向客户定制需求的塑料平托盘模块化设计

分析塑料托盘客户需求特点、设计中存在问题及模块化设计技术的应用现状,提出面向客户定制需求的塑料平托盘模块化设计方法的必要性。通过塑料平托盘结构分析及依据模块化等相关理论,对塑料平托盘结构进行模块划分;由塑料平托盘客户需求确定其客户定制需求以及塑料托盘客户定制需求结构模型。最后提出面向客户定制需求的塑料平托盘模块化设计方法及制定相应设计流程。图5参10     

室内装修用特制定向刨花板

本文介绍了一种加拿大产特制定向刨花板,该板材是为室内装修和家具制造而特制的,通过对其生产原材料、生产工艺特点、产品性能的分析,并就该产品在室内装修领域进行了探讨,期望室内设计师、家具设计师和用户对该特制定向刨花板有全新的认识。     

特种绳纤维材料的发展和应用

绳是一种特种纺织品。随着科技的发展,特种绳性能不断提高并发挥着越来越重要的作用。通过伞绳、渔业用绳和船用缆绳的材料从采用植物纤维到以高性能纤维取代的历程,介绍了特种绳纤维材料的发展和应用。     

鸡精专用酵母抽提物的研制与应用

酵母抽提物(又称酵母味素、酵母精,英文名称为Yeast extract)是以蛋白质含量丰富的食用酵母为原料,采用生物技术,将酵母细胞内的蛋白质、核酸等进行降解后精制而成的天然调味料.     

鸡精专用酵母抽提物的研制与应用

介绍一种针对鸡精产品的专用型酵母抽提物的研制过程,并对其在鸡精产品中的应用效果进行研究,结果表明:鸡精专用酵母抽提物能有效提高产品中其它氮的含量,提升产品的风味,是一种理想的鸡精原料。     

低聚木糖在特殊医学用途配方食品中的应用

随着我国糖尿病、高血压、高血脂等慢性病人群不断增加,特殊医学用途食品因其在解决以上慢性病方面具有特殊重要的作用而逐渐引起广泛关注。开发和深入研究特殊医学用途配方食品是未来食品发展的新方向,而发掘用于特殊医学用途配方食品的原料和成分是其研究内容之一。低聚木糖作为一种可溶性膳食纤维,具有很好的生理特性,可以调节肠道菌群,预防癌症,降低血压、血脂和血糖等生理学功效,是一种提高免疫力、促进身体健康的理想益生元。本文首先简单介绍了特殊医学用途医学用途食品的定义和发展现状,然后介绍了低聚木糖的理化性质、生理功能、安全性及其在特殊医学用途配方食品中的潜在应用价值,为低聚木糖在特殊医学用途配方食品中的进一步研究和应用提供参考。     

Comparison of a small and a large environmental test chamber for measuring VOC emissions from OSB made of Scots pine (Pinus sylvestris L.)

An investigation was undertaken to compare small environmental test chambers (23.5 L) with large ones (1 m³) for measuring the release of volatile organic compounds (VOC) from OSB made of Scots pine (Pinus sylvestris L.). Two samples were cut from one industrially manufactured OSB and were tested over a period of 45 days. Emissions are mainly composed of monoterpenes and aldehydes. Only small differences are obvious in the results acquired in both chambers. The maximum deviation of ±10% must be rather subscribed to stochastic and systematic errors of the method than to differences between both chambers. Thus, small environmental test chambers are generally suitable for measuring organic emissions from wood and wood-based products.     

Mechanical and physical properties of cement-bonded OSB

The objective of this paper was to evaluate the mechanical and physical properties of oriented strand board (OSB) using cement as binder. It was found that an increase of cement-wood ratio resulted in an increase of all, but MOR values. A lower cement-wood ratio than for particleboards is required in order to manufacture acceptable OSB and this may be due to the strands geometry.     

Mechanical and physical properties of cement-bonded OSB

The objective of this paper was to evaluate the mechanical and physical properties of oriented strand board (OSB) using cement as binder. It was found that an increase of cement-wood ratio resulted in an increase of all, but MOR values. A lower cement-wood ratio than for particleboards is required in order to manufacture acceptable OSB and this may be due to the strands geometry.     

利用青海地产小麦开发饼干专用粉的研究

针对青海春小麦品质较差,面筋含量较低,筋力较弱的特性,研发生产成酥性饼干专用粉。     

定向结构刨花板表面粗糙问题的研究

本文对定向结构刨花板表面粗糙问题从工艺和设备上进行深入的研究 ,通过气流铺装施加表面细化材料以提高板面平整度。研究表明 ,采用细化材料的方法是可行的 ,产品质量达到加拿大国家标准二级板的要求。