共查询到19条相似文献，搜索用时 265 毫秒
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现在有不少楼房在冬季采用地热采暖,而市场上地板种类很多,有实木地板、复合地板等,一般来说,复合地板较适合用作地热地板。实木地板一般厚度在2cm左右,安装时要打龙骨,如用其作地热地板,地板与地面之间有空气,空气和木材的热传导系数都非常低,这样热量就不易传导到地表,导致热量的浪费,若地表温度不均匀,温差感觉就明显。复合地板是经过高温压制的,内部水分含量非常少,所以地板不会因为水分的散失而产生变形。多层实木复合地板每层间横竖交错,互相牵制,背面还有密集的抗变形沟槽,分解了受热面产生的应力,因此变形量很小。实木地板含水量高,… 相似文献
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1 引言 实木复合地板分为两层、三层和多层.两层实木复合地板的表板是4mm厚的独幅薄板(优质木材),基材足木条拼板(木条通过筋条横向等间隔连接)或多层胶合板(加工等间隔槽),主要用于地热地板.三层实木复合地板的表板厚为2～4mm,为优质木材,木条芯板厚为8.5～10.5mm,背板是2.5mm厚的单板,芯板和背板基本上是速生材.多层实木复合地板的表板厚度是0.6～2.0mm厚的独幅薄板(优质木材),基材是多层胶合板.实木复合地板在表板、芯板及企口等加工环节需要使用切削刀具.下面从表板、芯板及企口等加工环节,介绍各类切削刀具. 相似文献
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三层或多层实木复合地板由于面板多用柞木、水曲柳、色木等贵重树种,而背板多用杨木等廉价树种,且面板和背板的厚度也不相同,再加上含水率的差异致使三层或多层实木复合地板在热压合成时容易造成弓弯和翘曲。当弓弯或翘曲超出一定限度时,就变成残次品或废品,给经营者带来损失。 相似文献
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通过对4种树种的面板和3种不同结构的实木复合地板的导热性能进行温升变化测试分析,测量地板的温度变化,探讨不同的装饰面板及地板结构对不同实木复合地板导热性的影响,旨为改善地热地板导热性能提供技术支持。研究结果表明:装饰面板的种类对实木复合地板的导热性能有明显影响,以黑胡桃作为装饰面板的实木复合导热性能最好,桦木次之,槭木导热性能最差,这主要是由于密度越大的装饰面板,导热性能越好,传热越快,热量损失也越少;地板结构对导热性能也有影响,面板为锯切薄板的三层实木复合地板的导热性能较好,多层实木复合地板的导热性能较差。因此,作为地热地板使用的实木复合地板,其装饰面板应该选择较大密度材种,且为锯切薄板为佳。 相似文献
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The relationship between the moisture content (MC) of wood blocks and the feeding activities of two Japanese subterranean termites, Coptotermes formosanus Shiraki and Reticulitermes speratus (Kolbe), was investigated with two choice tests. When three wood blocks with low MC (6%–12%), middle MC (79%–103%), and high MC (140%–182%) were exposed to workers of C. formosanus and R. speratus in a choice test, the feeding preferences were found in the middle MC blocks for C. formosanus, and the middle and high MC blocks for R. speratus, although wood blocks of low MC were also attacked. In a second choice test, wood blocks consisting of five pieces with water-impregnated (MC: 133%–191%) top, middle, or bottom piece were exposed to workers of both species. Higher consumptions were generally obtained in water-impregnated wood pieces and bottom pieces. 相似文献
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Scots pine sapwood (Pinus sylvestris L.) and Douglas fir heartwood (Pseudotsuga menziesii Franco) specimens were exposed in double layer field trials at 23 different European test sites under different exposure
conditions (in total 27 test sets). The material climate in terms of wood moisture content (MC) and wood temperature was automatically
monitored over a period of up to 7 years and compared with the progress of decay. The overall aim of this study was to establish
dose–response relationships between climate factors and decay as a basis for the service life prediction of wood. The “Scheffer
Climate Index” based on weather data collected at official meteorological stations at the different test sites poorly correlated
with the corresponding decay progress and was therefore not a suitable tool for estimating site-specific decay potential.
In contrast, the use of the combined material climatic parameters MC and wood temperature led to a feasible dose–response
function and turned out to be a useful basis for service life prediction of wood. 相似文献
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三聚氰胺脲醛树脂改性酚醛树脂胶粘剂的研究 总被引：2，自引：0，他引：2
采用常规合成的脲醛(UF)或酚醛(PF)树脂胶对多层胶合板贴面时，很容易出现开胶或透胶现象。本研究采用三聚氰胺脲醛(MUF)树脂对PF树脂进行改性，生产浅色改性PF胶粘剂，探讨了MUF与PF树脂摩尔比、混合比、热压条件等对胶液的粘度、缩合度、稳定性、胶层颜色及胶合质量的影响。结果表明，改性后的浅色酚醛树脂胶粘剂筘存性好、固化后胶层近似木材本色、高强耐水、耐候，用来压制的多层实木复合地板可达到GB9846．1～12-88Ⅰ类胶合板要求。 相似文献
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In the present study, durability of untreated and thermally modified sapwood and heartwood of Scots pine and Norway spruce was examined using a modified double layer test. Base layer samples were partly on contact with ground where exposure conditions were harder than that in a double layer test above the ground. The base layer on ground contact gave results already after one year of exposure in Finnish climate, but the top layer of a double layer test element simulated more the situation of decking exposure.Significant differences in durability and moisture content (MC) between the wood materials were detected after six years of exposure in the field. Thermally modified pine heartwood performed very well in all layers of the test element and only minor signs of decay were found in some of the base samples. Both sapwood and heartwood of thermally modified spruce were suffering only slight amounts of decay while thermally modified pine sapwood was slightly or moderately decayed. Untreated sapwood samples of pine and spruce were severely decayed or reached failure rating after six years in the field. Untreated heartwood samples performed clearly better. The highest MCs were measured from untreated and thermally modified pine samples. Thermal modification increased significantly the durability and decreased the MC values of all wood materials. 相似文献