单板拼接设备

单板饰面家具占木家具的半壁江山．单板拼接是木家具生产中的基本工艺操作．薄木单板经拼接使表面经典．图案更精美。单板拼接的质量涉及到最终产品表面质量。单板拼接设备是单板饰面工艺中的重要设备，其设备的性能和效率影响到整个工艺。     

喷气式网带单板干燥机的设计计算

一、前言喷气式网带单板干燥机是连续地干燥单板的一种主要设备,它是胶合板生产的三大主机之一,其工作原理是利用蒸汽散热器把空气加热到150℃以上,借助于通风机和喷嘴,使热空气多次横向循环并以15m/s的速度垂直地喷向单板表面,破坏湿单板表面的临界饱和水蒸汽层,从而使单板得到干燥。很     

氧冷等离子体处理条件对杨木单板表面润湿性的影响

用氧冷等离子体对杨木单板进行改性处理,研究不同处理功率和处理时间下杨木单板表面润湿性和自由能的变化,结果表明:氧冷等离子体处理能显著改善杨木单板的表面润湿性.经不同条件氧冷等离子体处理后,杨木单板表面接触角下降率达70%～80%,表面自由能增加率达200%～400%.较优的处理条件为:处理功率200w,处理时间3min.     

刨切单板加压干燥机的设计和运行

为改进单板质量,西德Babcock—BSH公司对干燥单板整平技术已进行了35年研究。 如果使物体变形的外力消失后,物体在内应力的作用下能恢复原状,则物体发生弹性变形。如物体不能恢复原状,则发生了塑性变形。因此,必须消除干燥单板的内应力,尤其是不平整的表层单板。 干燥时,应使单板处于平整状态充分热压并尽可能保持其原膨胀度,使单板经过热压干燥发生塑性变形。热压干燥后即应冷却单板,并使其膨胀度保持不变。 影响单板塑性变形即影响内应力大小的因素有:干燥温度,干燥时间,膨胀度(单板含水率),膨胀度的变化情况和木材树种的应力范围。     

Dornier公司的新型绞边装置DoSelvedge■

Dornier公司最近推出的Disc－O－Leno型圆盘绞边装置经过在喷气及剑杆织机上对各种类型织物及应用试验表明，它对生产出的布边质量有显著改善，引起业内人士广泛兴趣，纷纷要求在现有织机上加装这种装置。下面就介绍这种DoSelvedge绞边装置在各个领域的应用情况。精纺及羊绒织物由于在成衣业内日益广泛采用自动折叠和剪裁设备，人们对织物的布边提出越来越高的要求，以满足自动剪裁设备的需要。回折的布边在码起来剪裁时往往造成布料移动，而在自动剪裁的生成中这将导致出现次品衣片。因此，剪裁和缝制部门喜欢带绞边的料子。然而传统绞…     

新型单板干燥设备

在木材加工企业中,单板的干燥一般都采用热空气循环干燥机。胶合板生产厂及机械设备制造厂一方面继续致力于改进现有的干燥设备,另一方面也在研究其它原理的干燥设备。其中之一是单板热板干燥机,它是利用可控热板(开槽垫板或镀锌铁丝网)直接对单板加热加压,使其达到工艺要求的一种新型干燥设备。     

环氧改性聚酰胺树脂/纳米氧化铝浸渍实木单板改善导热和抗冲击性能

合成侧链含有氯丙醇基的环氧改性聚酰胺多胺树脂浸渍材料,并将其与纳米氧化铝分散液复配,通过真空加压浸渍的方法浸入木材单板中,再经高温干燥,可得到一种环氧改进聚酰胺树脂/纳米氧化铝改性单板,经过这种处理之后的单板导热系数、抗冲击强度均有明显提升,不同材种单板的抗冲击性能可提升7.87%～23.65%。经自制环氧氯丙烷改性聚酰胺多胺/纳米氧化铝浸渍液改性的杨木、黑胡桃、枫木、橡木单板,能够有效提高其单板的导热性能和抗冲击性能。     

胶合板车间空气压缩机站及其管路设计

目前用压缩空气作动力源的设备不断增加。特别是近年来由国外引进的胶合板设备,压缩空气的应用更加广泛。例如:由芬兰、日本进口的旋切机的防弯装置、单板卷大卷装置、单板气动切断机、横向拼缝机和宽带砂光机等很多设备都用压缩空气作部分动力源或全部动力源。随着木材加工企业生产自动化水平的不断提高,生产车间内现有的多台小型空压机、即存在浪费电力和人力、不安全、噪声大和不便管理等缺点,又很难保证设备的供气量和供气压力。在木材加工企业中,采用大型空气压缩机站统一向各用气设备供应充足的气体和足够的压力是保     

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。     

单板旋切过程中与质量相关变量研究的新发展

旋切工作在80年代初期只是强调增加产量.这种强调产量的后果使单板质量下降.在80年代后期,机器制造厂提出了质量问题.由于改进了旋切设备和质量控制程序的结果,现在可生产质量好产量高的单板,对重要的强度要求高的地方,如层积胶合板,强调单板质量将会给生产者以补尝.为了获得更加优质的单板,生产厂可能想要改进他们旋切机和精密刀具,在旋切过程中自动调节机床参数,或者考虑安装5/8英寸(15.9毫米)直径压辊.     

Rundmessern mit konstantem Radius

Circular slicing with constant radius (Tranchage Circulaire à Rayon Constant, TCRC) is a novel cutting method. The aim of saving wood gave impetus to the development of this method. The principle of the novel method is closely connected with the slicing and peeling of logs as commonly applied in veneer production. The thickness obtainable range from a few tenths of a millimeter up to 10 mm and more. The product obtained is smooth, it shows uniform thickness and an even surface. The method ist particularly suitable for processing small diameter logs, because the products obtained are produced with high yield. A prototype of the TCRC-machine is under trial. The slats produced by this method may find application in the wood-working industry (furniture, parquetry and packaging industry, laminated wood) and in craftmenship (joinery, interior furnishing, mouldings).     

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。     

The influence of certain factors on thickness loss after the hot gluing of cut lamellas into solid wood layered boards

An experimental laboratory investigation has been carried out into the hot gluing of solid wood layered boards made out of 5.3 mm thick solid-wood lamellas, the latter being produced by the lengthwise veneer cutting technique, the object of the research being to determine some of the reasons (humidity of wood before heating, temperature of wood before cutting into lamellas, and temperature and pressure during the gluing of boards) for the permanent thickness loss which occurs during gluing. Spruce wood (Picea abies (L.) Karst.) was used in the experimental tests. Before cutting into lamellas, this wood was classified into two humidity groups, and heated to three different temperatures. The dried lamellas were used, after suitable preparation, for the two outer layers, which were glued, together with a middle layer of sawn lamellas, by the hot gluing process. A total of 162 laboratory boards, of length 500 mm, width 475 mm and thickness from 24 to 25 mm, were hot glued, using melamin-urea-formaldehyde glue, at three different gluing temperatures and three different gluing pressures. Regression analysis of the measured results of thickness loss showed that the influence of the studied factors on thickness loss was linear, and that thickness loss depends the most on gluing pressure, followed by gluing temperature. It was also found that a higher wood humidity results in a slightly greater thickness loss than the wood’s temperature before cutting into lamellas.     

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。     

Peripheral milling properties of compressed wood manufactured from planted China-fir

Softwood exhibits different physical and mechanical properties in early wood and late wood, which often becomes the cause of some cutting defects during processing. These problems, however, can be partially solved by conversion into compressed wood. It can be expected that density and strength of the compressed wood increase with the increase in compression, thus affecting cutting resistance. The study on the machinability of compressed wood in order to justify its application is needed. In the test, green China-fir wood (Cunninghamia lanceolata) grown in plantations was compressed in radial direction using various compression sets, followed by peripheral milling parallel to the grain. The results showed that the horizontal cutting force increased with an increase in compression and depth of cut, but decreased with rake angle increase. The vertical cutting forces increased with an increase in cutting depth. No apparent relationship between vertical cutting force and compression was found. No significant difference existed in horizontal cutting forces beween up cutting and down cutting.     

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。     

Up-milling and down-milling wood with different grain orientations – the cutting forces behaviour

Peripheral milling of wood with up milling and down milling techniques is very well known from a geometrical point of view. However, in processing anisotropic materials such as wood, these geometrical aspects imply relevant differences when machining. In fact, milling of anisotropic material leads to different cutting geometries when up- or down-milling and when increasing or decreasing the depth of cut resulting in different grain orientations depending on the adopted process. In this paper, tests performed when processing Douglas Fir with different depths of cut and grain orientations are described. The cutting forces were measured, and the dependence of the cutting forces with respect on the cutting geometry are analysed and discussed.     

Fracture energy during cleaving of Pinus radiata

Cleaving or riving of wood is an efficient method of cutting, but is usually restricted to veneer cutting or low-quality products such as fence-palings, due to the poor surface finish that occurs on thicker offcuts. If the release of strain energy during fracture could be controlled then the surface finish and dimensional tolerance of cleaved wood products would be improved. A series of experiments were carried out on Pinus radiata to split it in the r.l. direction by mode 1 (crack opening) using both single cantilever beam bending and cleaving by a wedge. The offcut thickness, and the blade thickness and grinding angle were varied and the fracture, plastic and friction energies measured. When the offcut was 15 mm or greater the fracture surface energy from both types of cutting were similar and the friction and plastic energies were much larger; all energies were unaffected by blade dimensions? The mode of fracture of the 5 mm offcut was not simple crack opening and consequently the surface energy was a more significant proportion of the total energy, which is why smaller thickness offcuts may be cleaved in a controlled manner.     

Physikalische,insbesondere mechanische Eigenschaften von Kunstharz-Preßholz

In a first phase of a moresectional research work mechanical properties of compressed impregnated wood were investigated. Wood-based materials promising good suitability with respect to load-carrying joints in timber structures were selected from several products of the domestic market. Special regard was given to the relationship between the mechanical properties and the veneer profile, the veneer thickness and the overall thickness of resin-impregnated compressed wood products.     

Furnierverarbeitung in der Türen-, Paneel- und Möbelindustrie

True wood vencers are nowadays gaining increasing importance in varous fields of wood industry. The processing of veneers with suitable machinery is of special interest for the manufacture of doors and panels, as well as for furniture. This paper describes the preparation of veneers by smoothing (“ironing”) by means of special hot presses and trimming by vencer seissors. Further attention is given to three veneer jointing procedures at present in use: the respective equipment, its functions and capacities, are described. With respect to costs the three systems are compared and, finally, evaluated.