共查询到18条相似文献，搜索用时 234 毫秒
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正2017年11月,中国林产工业协会组织专家,对大自然家居(中国)有限公司研发的新产品——压干法高尺寸稳定性白橡实木地采暖地板,进行了鉴定。鉴定委员会由中国林科院木材工业研究所、国家林业局林产工业规划设计院、北京林业大学、西南林业大学、美国田纳西大学和国家木竹产业技术创新战略联盟的专家组成。压干法高尺寸稳定性白橡实木地采暖地板,是大自然家居从2016年起历时近两年研发的一款新产品,以白橡木为研究对象,采用压板干燥法进行地板坯料干燥处理,使木材细胞中的羟基重组,大大 相似文献
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模似环境下六种地采暖实木地板尺寸变化分析 总被引：1，自引：0，他引：1
本文对6种地采暖用实木地板,在2种模拟室内环境下的尺寸变化过程进行分析,结果表明：亚花梨（Pterocarpus angolensis）、柚木（Tectona grandis）的稳定性优良,膨胀率分别为0.16%,0.19%,收缩率分别为0.60%,0.42%;印茄木（Intsia spp.）、橡木（Quercus spp.）和圆盘豆（Cylicodiscus spp.）的3种地板的尺寸稳定性相差不大,膨胀率为0.25%～0.30%,收缩率为0.55%～0.75%;番龙眼（Pometia spp.）的尺寸稳定性最差,膨胀率最大,为0.49%,收缩率为0.66%。 相似文献
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采用窑式常压过热蒸汽方法对栎木地板坯料进行超高温热处理,研究了相对湿度在40%～90%变化范围内,热处理工艺对栎木地板尺寸稳定性的影响。结果表明：热处理并未显著减小木材干缩系数,但能显著减小使用环境温湿度变化对木材含水率变化的影响,从而提高栎木地板使用时的稳定性。为满足地热采暖使用条件,宜采用190℃热处理温度。 相似文献
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正GB/T 35913-2018《地采暖用实木地板技术要求》、GB/T 18107-2017《红木》等木材标准宣贯培训暨产业发展研讨会,于2018年5月在杭州举行。全国木材标准化技术委员会、中国林科院木材工业研究所主办;全国木标委秘书处、中国林产工业协会实木地板联盟、浙江省林产品质量监测站承办。地采暖用实木地板的工艺要求更加严格,需具 相似文献
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以白橡锯材为研究对象,采用热压机对其进行热压干燥处理,系统研究了热压温度、热压压力和试件宽度等因素对白橡木材干燥特性、颜色、吸湿性和尺寸稳定性的影响规律,获得了优化的热压干燥工艺。研究结果表明:采用热压干燥法可以实现白橡木的快速高效干燥,随着热压温度的升高,木材干燥速度显著加快,颜色逐渐加深,热压压力和试件宽度对干燥速率和颜色的影响不明显;热压干燥可以显著减小白橡木材的平衡含水率(EMC)和湿胀率,提高其尺寸稳定性,且随着热压温度的升高,白橡木材EMC和湿胀率降低,热压压力和试件宽度对木材EMC和湿胀率无明显影响;与对照材相比,热压干燥白橡木材的EMC降低9.97%~33.67%,径向和弦向湿胀率分别降低8.54%~33.96%、11.26%~30.02%;白橡木材的优化热压干燥条件为:热压温度为140~150℃热压压力为0.1 MPa,板材宽度为自然宽。 相似文献
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本文重点介绍了地板锯材或毛料的常规窑干技术，同时详细说明了地板锯材含水率基准的制定和修正。文中推荐了部分常用进口木材实木地板的窑干基准(厚度25mm)及其窑干工艺规程，供相关单位参考。 相似文献
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Plantation-grown progenies of Melia composita Willd.were studied for variability in several physical properties: density,radial and tangential shrinkage,longitudinal permeability of heartwood and sapwood.Furthermore,flat-sawn planks from each of the progeny were subjected to a quick-drying test for determination of kilndrying schedule.The mean density of the species was 0.39 g cm~(-3) and the wood may be categorized as light wood.Mean radial shrinkage(%) for the species was 2.8% with progeny-wise variation in radial shrinkage from 1.56 to 4.11%.Mean tangential shrinkage(%) for the species was 5.54% with progeny-wise variation in tangential shrinkage from 3.69 to 7.71%.The resultant tangentialradial shrinkage ratio was 1.98(less than two),which suggests that the wood is relatively stable with respect to drying behavior.Mean sapwood and heartwood longitudinal permeability of the species were 3.38 and 2.02 Darcy,respectively.Higher longitudinal permeability of sapwood and heartwood indicate better drying and preservative properties of the species.Terazawa quick-drying test method suggests that the species is less susceptible to drying defects.During the test,only moderate checks and cracks were observed.A tentative kiln-drying schedule was recommended based on these results. 相似文献
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Contact-free digital image analysis was performed of the radial shrinkage of fresh, fully saturated small spruce wood beams. An experimental test set-up was developed to ensure constant distance from the charge-coupled device camera to the sample surface as well as constant climate and light conditions during the whole experiment. Dimensional changes were observed immediately after the drying process began. An unexpected distinct effect could be observed which could not be explained by drying surface layers only. After a fast initial radial shrinkage a slowing down of the dimensional changes occurred at high mean moisture contents. A complete interruption of any dimensional changes followed. Finally, a recovery from shrinkage was even observed. It is assumed that strong negative pressure occurred in the fully saturated capillaries owing to dehydration which led to additional dimensional changes. As a consequence, the break of the water column and aeration in these capillaries finally resulted in a recovery period in the shrinkage rate due to the pressure release. After this effect, the dehydration was characterized by a phase of fast and almost linear shrinkage due to drying surface layers. Finally, the shrinkage slowed down to zero when reaching equilibrium moisture content. 相似文献
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鉴于百度试验法时木材干燥特性研究的不全面性,首先利用百度试验法开展了滇产黄毛青冈材干燥特性的初步研究,提出了预报干燥基础,再据此以地板坯料为干燥对象开展干燥工艺的试验研究,以全面归纳分析黄毛青网材的干燥特性。百度法研究表明：黄毛青冈材的初期开裂为4级,内裂为5级,截面变形1—3级,干燥速度为1-2级。地板料干燥工艺研究表明：采用研究提出的预报基准,23mm厚黄毛青冈地板坯料从初含水率52．3％干燥到12．9％,干燥周期为492h,但干燥质量达不到国家标准中对地板料干燥质量的要求,严重变形和过高的含水率偏差是此中主要原因。综合评定后认为,黄毛青冈属难干材,文中还就其干燥工艺的优化提出了建议。 相似文献
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《Wood material science & engineering》2013,8(3-4):151-161
Abstract The aim of this study was to reveal some important physical properties of two lesser used wood species from Mozambique. Density of wood, green moisture content (MC), shrinkage, swelling, sorption–desorption behaviour and quantitative colour analyses were carried out to facilitate the potential use of Icuria dunensis (ncurri) and Pseudolachnostylis maprounaefolia (ntholo). The study found that the average densities at 12% MC were 907.1 kg m?3 for ncurri and 1023.4 kg m?3 for ntholo. The average values of green MC were 31.4% for ncurri and 39.2% for ntholo. Ncurri and ntholo wood showed low coefficients of anisotropy for heartwood, 1.3 and 1.4, respectively. The colour measurements described the patterns of radial and longitudinal variations in wood colour. In conclusion, ntholo and ncurri are characterized by high density and dimensional stability. Ntholo can be used where small dimensional changes are required, e.g. in joinery, flooring and furniture. 相似文献
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Lars Hansson José Couceiro Bengt-Arne Fjellner 《Wood material science & engineering》2017,12(4):251-256
The aim of the present work was to use the displacement information generated from the spatial alignment in order to compute wood shrinkage in the radial and tangential directions in computed tomography (CT) images, and to compare the results with those obtained with computer-aided design software on the same images. To estimate the shrinkage coefficients from tomography images, wood specimens in the green state, equilibrium moisture content 15% and 8% state and oven dry condition were scanned. Specimens were taken from Norway spruce and Scots pine logs. The root-mean-square-error calculations showed acceptable small differences between the two measuring methods, which means that the algorithm is a useful tool for estimating the shrinkage coefficients in radial and tangential direction from CT images. This provides an image processing tool to monitor the dimensional changes during the drying and heat treatment process. 相似文献