刨花板工艺技术与其进步——刨花施胶

从刨花板生产的刨花施胶技术的发展历程和拌胶机结构改进与控制技术进步,分析了刨花施胶工艺关键要素,阐述了刨花施胶工段的设备配置与调试技术.     

改性山核桃外果皮/竹刨花板制造工艺研究

以漆酶改性处理的山核桃外果皮,代替部分胶黏剂添加到竹刨花中,研究山核桃外果皮粉用量、胶黏剂用量、漆酶用量、防水剂用量,板坯含水率、热压温度、热压压力、热压时间对山核桃外果皮/竹刨花板性能的影响;确定最优化的制板工艺参数:山核桃外果皮添加量10%、漆酶用量60 U/g、施胶量6%、防水剂用量1%,板坯含水率27%、热压温度200℃、热压压力3 MPa、热压时间为16 min。     

欢迎订阅《竹质定向刨花板制造技术研究》

中国林业出版社出版。作者:傅万四,国家林业局北京林业机械研究所副所长,研究员。本书介绍了BOSB概念的提出及其研究背景;论述了用竹材制造BOSB的可行性调查;阐明了竹材切削方式的研究;阐述了竹材刨花形态、热压参数、胶黏剂及施胶量对BOSB性能的影响;并创新性地提出了竹材OSB刨片机     

胶黏剂发明专利

<正>申请号:CN201410207445发明名称:一种降低三聚氰胺改性脲醛树脂木材胶黏剂施胶量的方法公开号:CN103965819A申请人:南京林业大学摘要:本发明属于木材胶黏剂领域,特别涉及一种降低三聚氰胺改性脲醛树脂木材胶黏剂施胶量的方法。包括制胶、调胶、施胶和热压步骤,其特征是通过稀释的方     

豆粕基胶黏剂纤维板压制工艺的研究

研究分析了施胶量、热压时间及板坯含水率对豆粕基胶黏剂纤维板的影响,为相关企业生产豆粕基胶黏剂纤维板提供参考。     

刨花板发明专利

申请号:CN201910992678.5发明名称:一种低密度芦苇刨花板及其制备方法公开号:CN110605772A申请人:盘锦积葭生态板业有限公司摘要:本发明涉及生态板材技术领域,提供了一种低密度芦苇刨花板及其制备方法。本发明提供的制备方法在表层刨花和芯层刨花中加入胶黏剂和增黏剂,通过控制胶黏剂的加入量,提高芦苇刨花表面的胶钉数量(微小胶滴的个数),从而可以在保证芦苇刨花板的物理性能指标的基础上适当地减少芦苇刨花的用量,进而降低芦苇刨花板的密度。     

刨花板生产调拌胶工艺及设备的发展

调拌胶是刨花板生产中的一个关键工序,涉及到刨花与胶黏剂、石蜡乳液的配比,胶黏剂与固化剂的配比,板坯含水率等多项工艺要求,影响到刨花板的质量指标及其稳定性.本文介绍了我国刨花板生产调拌胶的发展过程及高端刨花板生产线配置的几种主要的调拌胶系统流程与使用.     

刨花板生产调拌胶工艺及设备的发展(续)

调拌胶是刨花板生产中的一个关键工序,涉及到刨花与胶黏剂、石蜡乳液的配比,胶黏剂与固化剂的配比,板坯含水率等多项工艺要求,影响到刨花板的质量指标及其稳定性.本文介绍了我国刨花板生产调拌胶的发展过程及高端刨花板生产线配置的几种主要的调拌胶系统流程与使用.     

木质素基豆粕胶黏剂胶合板热压工艺研究

以酶解木质素和豆粕为原料制备了木质素基豆粕胶黏剂,优化了木质素基豆粕胶黏剂应用于杨木胶合板的热压工艺参数,探讨了不同工艺参数对胶合板胶合强度的影响。试验结果表明,木质素基豆粕胶黏剂制备胶合板的优化热压工艺参数为热压温度120℃、热压时间7.5 min(75 s/mm)、热压压力0.9 MPa、单面施胶量180 g/m²;影响胶合板胶合强度的工艺参数主次顺序是热压温度、热压压力、施胶量、热压时间;采用优化热压工艺条件制备3层胶合板,其Ⅱ类胶合强度大于1.0 MPa,符合GB/T 9846-2015《普通胶合板》中Ⅱ类胶合板要求。     

新型刨花拌胶机

传统的刨花施胶设备型式繁多,各有特点,但尚不能满足施胶各项技术指标的要求。七十年代以来,人们不断研制更为理想的施胶设备,特别是近年来,联邦法国,芬兰和苏联等国家研制的高速刨花拌胶机颇具特色,现简介如下 1.K—TT—C型刨花拌胶机 K—TT—C型拌胶机系高速拌胶设备。是联邦德国Drais公司研制的。 K—TT—C型高速拌胶机的典型结构如图1所示。 共拌胶室为圆柱形和圆锥形结合的腔     

玄武岩长丝表面低温等离子体处理及其浆丝集束性能

针对玄武岩纤维表面光滑、集束性差且呈化学惰性,纤维浸润性差导致其与浆液黏附力不足的缺陷,采用低温等离子体技术改性玄武岩长丝表面,以改善玄武岩长丝浆丝时集束性能。探讨放电功率、放电气压及放电时间对玄武岩长丝表面形态、静摩擦因数、动摩擦因数及力学性能的影响,借助扫描电子显微镜对改性玄武岩长丝的表观形貌进行表征,分析改性玄武岩长丝与纺织浆料黏附性能的关系。结果表明：低温等离子体改性后玄武岩长丝表面粗糙程度提高,比表面积增大,摩擦因数增加,玄武岩长丝与纺织浆料的黏附性增强,集束性明显改善;当放电功率为300 W,放电气压为30 Pa,放电时间为7 min 时,改性玄武岩长丝上浆率高,浆丝集束性好。     

环氧涂层预应力钢绞线性能对比研究

介绍环氧涂层预应力钢绞线的应用,并对单丝涂覆环氧涂层预应力钢绞线和填充型环氧涂层预应力钢绞线在产品标准、力学性能、疲劳性能、防腐性能等方面进行对比研究。结果表明:填充型环氧涂层预应力钢绞线破断拉力比单丝涂覆环氧涂层预应力钢绞线高3%~4%,安全性能更高;填充型环氧涂层预应力钢绞线的钢丝之间填充环氧树脂,在钢丝之间形成减摩层,避免了微动磨损疲劳的产生,抗疲劳性能比单丝涂覆环氧涂层预应力钢绞线优越。对2种环氧涂层预应力钢绞线进行抗化学性能和盐雾试验,验证了填充型环氧涂层预应力钢绞线防腐性能优于单丝涂覆环氧涂层预应力钢绞线。     

复合材料树脂传递模塑注胶工艺调控方法与技术

针对树脂传递模塑成型(RTM)注胶过程中,预型体内部存在局部空气无法完全排除或树脂不能完全浸润有效区域而产生气泡或干斑问题,系统分析了RTM成型过程中气泡缠裹和干斑的形成机制。介绍了注胶工艺过程中预型体渗透率区域分布差异性、预型体纱束空间交织规律差异性、预型体与模腔尺寸差异性和RTM模具进出料口位置数量与所需差异性等非确定性因素对RTM注胶流动质量的影响,并提出RTM树脂流动形态调控的新技术与方法。同时,对T型复合材料结构制件进行RTM树脂流动工艺仿真模拟,为复杂结构复合材料RTM注胶新技术的发展提供理论与方法参考。     

Rapid prediction of surface characteristics of European and Siberian larch wood by FT-NIRS

Application of coatings on larch wood surfaces with high concentrations of arabinogalactan and wood resins and/or low pH-values can pose problems regarding film formation and service life of coatings. In the present feasibility study, FT-NIR spectroscopy as a method for the quantification of the abovementioned wood characteristics on the surface of heartwood of European and Siberian larch (Larix decidua, Larix sibirica) was investigated. Predictions by FT-NIRS were accurate and reliable for the actual arabinogalactan content on the wood surface with R² (CV) of 0.75–0.89 and RMSEP of 18.82–29.14 mg g^?1. Prediction of the pH-value of the larch wood surface was also possible, although less reliable than for the arabinogalactan content (R² CV: 0.60–0.70; RMSE: 0.34–0.37). The prediction of the wood resin content allowed only a rough estimation of the actual resin concentration, which might be due to the uneven distribution of the wood resin across the wood surface. It was concluded that the quantification and finding of extreme values of arabinogalactan content and surface pH-value can be predicted accurately, while the prediction of the wood resin content gives only indicative values.     

马尾松TMP树脂模型物的胶体特性

以脂肪酸、树脂酸、三油酸甘油脂为模型物,模拟了马尾松TMP造纸过程中造成树脂障碍的主要成分。通过对比研究马尾松TMP树脂和混合树脂模型物的胶体粒径分布与Zeta电位特性,对模型物的模拟可行性进行了评价。分析了各组分模型物的胶体粒径,重点探讨了pH值、温度、电解质浓度对各模型物胶体颗粒表面电荷、分散质粒子的存在形式和稳定性的影响。     

环氧树脂改性水性聚氨酯皮革涂饰剂的性能研究

采用机械共混法制备了环氧树脂改性水性聚氨酯涂饰剂,研究了环氧树脂用量对涂饰剂乳液及涂膜性能的影响。结果表明:环氧树脂用量为8%时,涂饰剂的乳液稳定性仍较好;随着环氧树脂的加入量增大,乳液黏度和表面张力增大,乳液的平均粒径变大;涂膜的抗张强度、耐水、耐溶剂、耐酸、耐碱、耐盐性能随着环氧树脂用量的增加而提高,而涂膜断裂伸长率和回弹性随着环氧树脂用量的增加而下降。     

Investigation of Urea-Melamine-Formaldehyde (UMF) resin penetration in Medium-Density Fiberboard (MDF) by High Resolution Confocal Laser Scanning Microscopy

A confocal laser scanning microscope (CLSM) was used to investigate the distribution and penetration of urea-melamine-formaldehyde (UMF) resin in the fiber when injected through blowline blending in a medium density fiberboard (MDF) pilot plant. Samples were prepared with respect to industrial parameters and were collected at the dryer’s end. The samples were later dyed in a Dye Star-Brilliant Red solution (0.01%) and rinsed with distilled water to remove excess. The samples were scanned with the CLSM to build three-dimensional reconstructions of MDF fiber cross-sections. With proper lenses and optimized CLSM settings, it was possible to obtain fiber reconstructions with a resolution greater than the laser wave length (514 nm). The Zeiss CLSM built-in software image analyzer enabled to rebuild them in rotation on any of the three axes with up to 64 images per rotation. The resin penetration sites were identified using this software option. The penetration sites were numerous and well dispersed. The largest openings (lumen, pits and cracks) were responsible for most of the resin lost by over-penetration. The presence of resin in the cell walls (detected with the CLSM) proves their porosity without giving much information about the resin concentration. Finally, the atomic force microscope (AFM) enabled to recreate the finest surface details for these fibers samples. It was found that the fibrils aggregates orientation and size can influence the resin penetration and distribution. It was concluded that the porous structure of wood fibers and their affinity to water enable the resin to penetrate through capillary force. This phenomenon is stimulated by the high pressure, saturated steam, turbulent flow and heat. When injected in the pilot plant blowline, UMF resin was uniformly distributed over the fiber surface (22.5% coverage). The resin penetration was however important and also occurred in nanometric defaults of the wood fibers. Thus, industrial panels made out of very porous, damaged or small fibers will need more resin to fill the gaps in order to make a strong board.     

玻纤/环氧树脂复合材料VARTM成型工艺仿真及实验

针对真空辅助树脂传递模塑(vacuum assisted resin transfer molding,VARTM)工艺成型玻纤/环氧树脂复合材料存在气泡、聚胶等问题,采用PAM-RTM软件对该复合材料的VARTM成型工艺进行模拟仿真。通过改变流道的设计方案,控制树脂黏度,观测充模过程中树脂的压力分布及充模时间,优化实验工艺,进而对模拟结果进行实验验证。结果表明:最佳注射方案是平行于Y轴一侧线性注入,另一侧线性排出。多线性注射虽然可以提高效率但是同时会出现交汇、聚胶等现象。充模时间随树脂黏度的增加而增加,随着充模过程的进行,黏度过高的树脂会发生部分固化,影响纤维的浸润。因此,树脂黏度控制在0.5 Pa·s左右较为合适。根据模拟优化结果,采用VARTM工艺分别制备2种典型的玻纤/环氧树脂复合材料。发现最佳注射方案,制备的复合材料表面光滑,无明显气泡、聚胶等缺陷,注射方案较好。     

Three-dimensional model for size and location of resin pockets in stems of Norway spruce

Resin pockets, being an important natural characteristic for wood quality and tree physiology, were observed on the surfaces of boards sawn from four large Norway spruce (Picea abies (L.) Karst.) trees and analysed for size and distribution. Axial length varied between trees and increased from pith to surface and from butt to top; however, three quarters of the variation were random and normally distributed. Also resin pocket frequency varied between trees. Within the stem, the resin pockets remained independent and randomly distributed following the exponential distribution in all three directions: radial, angular and axial, corresponding to a constant probability during the lifespan of the tree. No association between size and frequency was identified. The initiation and the expansion of a resin pocket appear to be controlled by two different physiological processes. The findings should add to the understanding of resin pocket formation in spruce and should be applicable to wood quality     

基于激光扫描堆积表面重构的烟丝布料调控技术及应用

为提高贮丝柜烟丝布料均匀性,采用激光扫描表面重构技术建立了烟丝布料控制系统。利用激光扫描仪测量贮丝柜烟丝堆积表面高度,当波峰与波谷之间的高度差H>阈值H0且烟丝堆积截面的波谷面积M≥λS（λ为面积比例系数,S为铺料截面积增量）时,调整分配车的步进距离,通过降低高度差调控烟丝堆积表面状态。利用该系统对烟丝布料状态进行调控,结果表明：(1)调控后烟丝堆积高度差从139 mm降低到67 mm,标准偏差由79 mm降低到50 mm,变异系数降低5百分点;(2)调控后烟丝含水率、填充值、整丝率和碎丝率变化量分别为0.08百分点、0.1 cm3/g、2百分点和0.3百分点,均优于调控前水平;(3)烟丝含水率、整丝率、碎丝率标准偏差分别降低0.07、0.49、0.10百分点。该技术可为提高制丝过程稳定性和烟丝工艺质量提供支持。