共查询到19条相似文献,搜索用时 171 毫秒
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2020年11月14日,中国林产工业协会在北京组织专家对圣象集团有限公司、北京林业大学和湖南绿达新材料有限公司联合研制的“木质素胶无醛多层实木复合地板”进行了新产品鉴定。研制单位采用无添加甲醛木质素胶黏剂作为实木复合地板基材和贴面用胶,采用五段式热压工艺和严控施胶量等措施,降低了产品分层和鼓泡等缺陷,提高了产品耐水性。 相似文献
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以红橡表板多层实木复合地板为研究对象,研究高耐磨涂饰工艺及其设备配置。研究表明,采用12道涂布工序可使多层实木复合地板漆膜硬度达5H、表面耐磨小于0.08g/100r。 相似文献
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采用单因素试验,通过热压参数、胶水固体含量(黏度)和涂布量及涂布辊参数等工艺参数的改变,较好地解决了公司薄木贴面多层实木复合地板生产中经常出现的鼓泡问题,使其比例控制在2%以内.大批量的生产证明:胶水合适的固体含量(黏度)可以有效地解决鼓泡问题,涂布辊的纹路细密也可以改善涂布的均匀性,降低鼓泡比例. 相似文献
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采用水性高分子异氰酸酯胶黏剂,以柞木、赛鞋木豆(乌金木)和橡胶木3种木材单板为表板制备杨木芯的三层实木复合地板.结果表明:赛鞋木豆(乌金木)和橡胶木的胶合性能良好,而柞木性能较差,分析认为与柞木木材表面性能以及胶合工艺等有关. 相似文献
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延长热压压贴后大板翻板冷却的时间,可以有效降低板面温度,缩短地板坯料的养生时间,减少养生占地面积,提高生产效率。 相似文献
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延长热压压贴后大板翻板冷却的时间,可以有效降低板面温度,缩短地板坯料的养生时间,减少养生占地面积,提高生产效率。 相似文献
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Effect of grain orientation and surface wetting on vertical density profiles of thermally compressed fir and spruce 总被引:1,自引:0,他引:1
The effects of grain orientation and surface wetting on wood densification by compression in a hot press were evaluated for two commercial Canadian wood species, balsam fir (Abies balsamea) and black spruce Picea mariana. The vertical density profiles (VDP) of wood densified at 180 °C could be engineered to achieve different properties depending on press closing rate, wood permeability and annual ring orientation. The lower permeability of spruce caused it to split frequently during hot pressing. For balsam fir, at a press closing time of 2 min, the compressed wood with an original grain angle of 0° (radial compression) shows widened high density bands due to collapse of low density earlywood adjacent to the dense latewood. All grain orientations show higher density areas close to the wood surfaces similar to those of wood-based composites. However, when wood was preheated without pressure for 5 min followed by a press closing time of 2 min, water migrated to and plasticized the board centre causing it to be densified while the surface density remained low. Wood surface plasticizing with water or urea solution causes some localized surface densification, but the effect was not great. 相似文献
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The composition of the cold and hot water extracts from fresh and dried fir wood was studied and compared with the composition of the wood. The main components identified in the extracts are polysaccharides (polyoses); the percentages of proteins and ash, however, are also comparatively high. 40–50% of the extracted substances were not identified. They are obviously not related to lignin, but they consist of aromatic compounds at least in parts and contain a relatively high amount of oxygen. Differences between cold and hot water extracts as well as between extracts from fresh and dried wood were evaluated. 相似文献
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O. Wittmann 《Holz als Roh- und Werkstoff》1989,47(6):227-233
During the manufacture of films for coating wood based materials some formaldehyde is emitted, which is measured and related to the amount of aminoplast resins applied. It is shown, to which degree the manufacturing method, the conditions of processing and the wood species influence the formaldehyde release. The formaldehyde release during pressing of films is low and well measurable. The formaldehyde release of coated wood based boards is remarkably reduced by the application of foils. 相似文献