An image processing algorithm for detection and analysis of slicing checks

European Journal of Wood and Wood Products - In this paper, a new method of measuring slicing checks for flat-sliced veneers was evaluated. The method is based on image analysis of veneer...     

木材基布的开发与研制

介绍了木皮的种类,木皮复合基布木材基布的开发及研制过程,并在对非织造布木材基布的技术性能进行了测试的基础上提出的木材基布的使用方法。     

精密裁板锯主锯片固有频率的分析研究

:本文采用弹性力学理论中求解薄板的自由振动微分方程的方法 ,推导出主锯片固有频率的计算公式 ,并对影响主锯片固有频率的几个参数进行了分析 ,通过对牡丹江木工机械厂生产的MJC1125型精密裁板锯的实测 ,验证了用该方法所计算的主锯片固有频率的理论计算值和实测值比较接近 ,误差在3 %以内。     

Weathering of chemically modified wood

The weathering characteristics and microscopic structure of unfinished acetylated and untreated radiata pine are reported. Samples were exposed outdoors over 28 weeks in Rotorua, New Zealand. Acetylated veneer had improved checking resistance when compared with untreated veneer, confirming results of a previous study on accelerated weathering of untreated and acetylated veneer. Colour changes of naturally weathered untreated and acetylated veneer were very different to that of artificially weathered veneer. Acetylated veneer was only slightly less grey than untreated veneer after 28 weeks' natural weathering.     

竹木复合地热地板表板开裂的研究

竹木复合地热地板作为一种地面装饰材料,使用中长期受到较高温度的加热。会发生一定的变形。进而造成表板发生开裂。本文对四种结构竹表板的竹木复合地热地板进行促进试验研究。研究结果表明。经碳化处理的竹单板较本色竹单板易发生面层开裂;平压竹单板较侧压竹单板易发生面层开裂。最后形成竹木复合地热地板表板开裂的评价方法。     

杨木单板漂白技术研究

以过氧化氢为主漂剂对杨木单板进行漂白试验,以各组分剂量作为考察因素,常温下对杨木单板进行漂白,后经不同的处理工艺,对其白度变化进行测定与分析.结果表明,过氧化氢浓度对白度影响最大,氢氧化钠处理漂白单板能降低返黄程度,氨水的添加量对试验考察指标影响不大.     

浅谈生产薄木及薄木装饰板的工艺特点

探讨了生产天然薄木、人造薄木、薄木装饰板的工艺过程。     

尾叶桉仿黑胡桃的染色工艺研究

利用简洁的工序,探索尾叶桉仿黑胡桃的染色工艺,结果表明:对0.65mm厚的尾叶桉薄木染色,薄木不经漂白处理,添加所研制的渗透剂WX1,可直接染成黑胡桃色,染透仅需40min,染液总浓度不大于0.3‰,并且可以连续利用3次.处理后,尾叶桉薄木在花纹和颜色方面与黑胡桃相似,可以直接用于仿黑胡桃薄木贴面.     

微薄木贴面装饰工艺

介绍了微薄木的刨切工艺流程、微薄木人造板表面湿贴和微薄木家具仿实木模贴的工艺流程,结合生产实际阐述了微薄木人造板表面湿贴和微薄木家具仿实木模贴工艺的关键环节,分析了微薄木贴面中常见的问题及解决办法。     

高含水率染色、固色桦木单板的胶合性能探讨

高含水率染色、固色单板的胶合质量是制造人造薄木的关键技术之一。试验比较、分析了不同含水率条件下,素板、染色、固色单板的胶合强度。结果表明：随着含水率的升高,素板、染色和固色桦木单板胶合强度均呈下降趋势,并且其湿状胶合强度均明显低于各自的干状胶合强度;素板的干湿状胶合强度均明显大于染色和固色单板。     

马尾松单板脱脂工艺的试验研究

采用碱液对马尾松单板进行脱脂处理,通过正交试验设计以脱脂率和抗拉率作为综合指标得出最佳的脱脂工艺,以期为马尾松单板的后续加工利用提供依据。结果表明:碱液脱脂能够有效降低马尾松单板中的脂含量,同时又不至于使单板强度降低太多;最佳的脱脂工艺为:药剂浓度0.5%,温度80℃,处理时间4 h,浴比为4。     

桉树单板高值化利用最新研究进展

概述我国桉树资源发展状况,从桉树单板化利用的产业化取得的进展和存在问题两方面阐述我国桉树单板化利用的产业化发展现状.结合当前我国人造板面临的形势,从单板化利用单元制备新技术、桉树无醛胶合板、网络状单板单元胶合板、重组硬木和复合胶合板等方面总结了我国桉树单板化的最新研究进展.     

利用单板划痕技术改善波萝格实木复合地板的质量

文章分析了波萝格复合地板涂饰表面裂纹及地板翘曲变形的原因;创新性地提出了改变地板结构及部分单板划刀痕的工艺方案。在实测的基础上,对波萝格地板涂饰表面裂纹情况进行了分析,验证了此工艺方案的可行性。     

Moderne Messerfurnierherstellung

The increasing use of face vencers for furniture and interior furnishing induced a remarkable impact to veneer factories to improve their production technology. It had to be considered on the one hand to achieve the utmost yield from the very expensive veneer logs by rationalizing and on the other hand to reduce production costs especially by improving the capacity of the machinery. Transportation systems and feeding devices of plants have been mechanized and partially automated. Besides the fully mechanized log band saw also circular saws are used for breaking down the logs for slicing. New heavy-duty slicers cutting during the upstroke have been developed. At the same time the Staylog-procedure using heavy-duty veneer lathes is increasingly being applied. With the automated slicer-lines also veneer drying has been technically developed. Cutting of veneer bundles is performed within clipper lines mostly combined with an electronically operated planimetric scanner.     

单板刨切技术的现状与发展

介绍了单板刨切技术的概况,分析了影响单板刨切质量的主要因素和存在的问题,提出了单板刨切技术的发展方向。     

杨木单板强化改性技术的研究

研究采用二种乙烯类单体混合的树脂液浸渍杨木单板,在引发剂和促聚剂的条件下,低温加热,使不饱和混合树脂单体或低分子预聚单体聚合成高分子固体.不饱和混合树脂单体在素材的细胞腔、细胞壁以及细胞间隙中产生聚合,甚至与木材组分发生反应,从而使杨木单板在材性方面取得较大的变化和改善.     

Ultrasound evaluation of lathe check depth in birch veneer

In this study, the lathe checks in birch veneer were examined with contact ultrasound and a preliminary study for the measurement with air-coupled ultrasound from green birch veneer (moisture content 60–75%) was carried out. The contact measurements were conducted from dry veneer and then from moistened veneer. Several ultrasound parameters measured from dry veneers were related with lathe check depth, e.g. correlation between ultrasound transit time and lathe check depth was 0.63 (p<0.001, N=30) when measuring perpendicular to grain from unchecked face of the veneer. The same correlation for moistened veneers was 0.74 (p <0.01, N=12). Furthermore, air-coupled reflection and through-transmission measurements were carried out with green veneer samples. In air-coupled through-transmission measurements, it seemed that moisture content dominated the measurement when measuring parallel to checks. There was also positive correlation between energy-related parameters in through-transmission and reflection measurement, which could be utilised to measure the properties of veneer with transducers on one side.     

Reduction of glue consumption in the plywood production by using previously compressed veneer

Zusammenfassung The production of plywood from previously compressed veneer allows to save up to 25% of glue, to halve the roughness of veneer and plywood and to press the plywood at a 22% lower pressure. However, the thickness of plywood reduces from 8.3 mm for uncompressed veneer to 6.4–8.0 mm for compressed veneer, and the density increases from 793 kg/m³ to 807–1005 kg/m³ accordingly.     

杨木单板高温高湿干燥工艺研究

通过对苏北意杨单板进行的高温高湿干燥实验,研究了意杨单板在高温高湿环境中的水分非稳态扩散系数,对干燥后的单板质量进行了检测,并与常规单板干燥进行了能耗比较,从而为实际生产提供了理论依据。