抗菌防霉浸渍胶膜纸饰面细木工板的制备

针对浸渍胶膜纸饰面细木工板的工艺特点和饰面材料抗菌防霉功能需求,通过试验分析不同配比的抗菌防霉剂纳米银用量和浸渍胶膜纸三聚氰胺胶黏剂的浸胶量对抗菌防霉性能及试板理化性能的影响。结果表明,5%抗菌防霉剂、140 g/cm²浸胶量,可以使浸渍胶膜纸饰面细木工板的抗细菌性能超过99%,防霉菌等级达到最高等级0级,均达到国家要求;采用两次涂施E0级脲醛树脂胶的基材制备工艺,细木工板基材和浸渍胶膜纸饰面细木工板的浸渍剥离、表面胶合强度、横向静曲强度均达到GB/T 5849—2016、GB/T 34722—2017的要求,浸渍胶膜纸饰面细木工板的外观质量(耐划痕、耐磨性能)、甲醛释放量也达到GB/T 34722—2017的要求。     

细木工板生产工艺初探

对细木工板生产中的芯条加工、干燥、胶拼和热压等工艺提出要求,并实施表板整张化,以保证细木工板质量。     

细木工板生产工艺初探

对细木工板生产中的芯条加工、干燥、胶拼和热压等工艺提出要求,并实施表板整张化,以保证细木工板质量。关键词：细木工板;芯条;干燥;表板整张化     

基于秸秆板的板木家具胶合作业研究

本文分析了秸秆板板木家具胶合作业的四种胶合方式:秸秆板拼厚、板木胶拼、表面贴面和板件封边的特点及工艺要求,并在此基础上,以板木胶拼为研究对象,运用工作抽样法,分解胶拼作业,同时进行作业测定,对胶拼作业进行分析并提出改进建议,使优化后的作业能提高33.9%的效率。     

聚酯浸胶线绳市场需求及前景

聚酯浸胶线绳主要用作三角带骨架材料在国外被广泛应用,近年来国内聚酯浸胶线绳三角带产量逐年增长。发展聚酯浸胶线绳具有十分广阔的市场前景。     

德国Zell公司线绳浸胶生产工艺与设备

德国Zell公司从轮胎帘布浸胶机积累的经验应用在线绳浸胶机上,其浸胶专有技术经历近半世纪之久,本文主要介绍Zell公司线绳浸胶生产工艺与设备。     

预打孔卷烟接装纸施胶效果及胶辊设计参数对通风率的影响

为考察预打孔卷烟接装纸施胶效果对通风率的影响,建立了一种接装纸施胶效果评价及无胶区偏移时的优化调整方法,在无胶区处于理想状态下利用正交试验研究了无胶区长度、宽度以及施胶厚度对通风率的影响。结果表明:(1)对预打孔卷烟通风率的影响依次为无胶区长度、宽度和施胶厚度,无胶区长度对通风率的影响达到显著水平。(2)随着无胶区长度的增加,预打孔卷烟通风率均值呈上升趋势,通风率变异系数呈下降趋势。(3)根据试验结果可确定"黄山(B)"牌号卷烟最佳胶辊参数组合为无胶区长度22mm,宽度8mm,施胶厚度0.03mm。该方法为提高预打孔卷烟通风率的稳定性提供了技术支持。     

先进的低面密度纤维喷胶技术

介绍了深圳市腾科系统技术有限公司研发的非织造布的低面密度纤维喷胶技术TechAdhesion TAF。该工艺可满足25~3 600 mm极大复合宽度要求和0.5~150 g/m2加工面密度的需求,满足透气喷胶的高技术要求,其产品强度比采用传统复合方式的产品提高30%~50%。     

氯丁胶胶粘皮鞋脱胶团素一百例

胶粘剂是一种能把两物体表面紧密地连接,起到传递应力,能满足一定物理、化学性能要求之物质。以胶粘剂实现的连接称之为胶接。胶粘皮鞋是通过专用的粘合剂,将天然皮革或各类作为帮面、内底的合成革,人造革与橡胶底(天然拷底革或热塑材料底)互相胶接而成的一种日常生活用品。影响胶粘皮鞋的粘合强度,造成脱胶的因素很多。这里我们将采用粘接型氯丁胶胶粘剂为主的胶粘皮鞋工艺中总     

浅析实木细木工芯板制造中存在的问题及解决措施

1 前言 细木工板是应用很广泛的一种产品,它是在芯板两面覆盖一层或两层单板经胶压而制成的一种特殊胶合板。细木工板常作为结构材料使用,因此不但要求其强度要大,而且尺寸稳定性要好。细木工板的芯板通常是用小木条拼成的,不象整板那样易翘曲变形。在同等厚度的情况下,细木工板比厚胶合板耗胶量少,板的密度小,成本低,可以充分利用小径材和木     

木材胶接时胶合强度的形成过程

简要概述了界面结合力的类型以及木材胶接操作过程中胶合强度的形成过程。     

Modifikation der Holzoberfläche zur Verbesserung der Verleimung

The surface of beech and spruce wood was modified using 10% ammonia solution before gluing with a PVA-c adhesive. Contact surfaces were levelled by sawing or planing and then activated with NH₄OH. The roughness of the modified surfaces has been measured. The wetting behaviour of sawed, planed and modified surfaces was determined as well as the various correlations between wetting, bonding, strength, penetration of adhesive, and spread of the bonding strength.     

水性高分子异氰酸酯胶黏剂胶合制备三层实木复合地板初探

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.     

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.     

Feasibility of glued laminated timber beams with tropical hardwoods

A feasibility study of glulam was carried out in French Guiana using local wood species. The aim was to determine gluing parameters affording satisfactory behaviour to manufactured glulam in a tropical climate. Three abundant wood species, with special properties, were selected for the study and resorcinol–phenol–formaldehyde resin was used for bonding. Three industrial parameters were considered: adhesive spread rate, closed assembly time and gluing pressure. Delamination and shearing tests were carried out in accordance with European Standards. The tests revealed the influence of wood properties and manufacturing parameters on joint resistance. In fact, the results showed that specific gravity and the shrinkage coefficient greatly influenced the gluing step. Indeed, wood with a medium specific gravity needed more adhesive and more pressure than wood with a high specific gravity. In addition, planing and lamella thickness were found to affect glue joint resistance.     

Influence of processing parameters and wood properties on the edge gluing of green <Emphasis Type="Italic">Eucalyptus grandis</Emphasis> with a one-component PUR adhesive

The predominant plantation hardwood species in South Africa Eucalyptus grandis is, despite relatively good strength and stiffness properties, seldom used for lumber production due to low dimensional stability, splitting, and cracking of the wood. As critical defects often develop or aggravate during the drying process, the edge gluing of Eucalyptus grandis lumber in its wet state, before kiln-drying, was considered a potential inhibiting factor for this behaviour. The objective of this study was to determine how certain material and processing variables influence the bond quality of unseasoned, edge-glued, Eucalyptus grandis, using a moisture-curing one-component polyurethane adhesive. The study considered the effect of four parameters, namely wood density, moisture content, adhesive spread rate and pressure, on the shear strength of bondlines. Micro computed tomography scanning was used to observe adhesive penetration behaviour. Overall, the bonding quality was satisfactory proving the feasibility of edge gluing of this wood in the wet state. Multiple ANOVA showed that generally better results were obtained for samples with a higher moisture content of roughly 60% compared to specimens with lower moisture content around fibre saturation point. Results indicated that the lower spread rate tested (150 g m^?2) should be preferred to the higher one (250 g m^?2), since it will likely give more stable shear strength results and it would be preferable from an economic point of view. Increasing pressure did not increase the shear strength significantly.     

乳化剂十二烷基硫酸钠(SDS)对淀粉基木材胶特性的影响

研究了乳化剂十二烷基硫酸钠(SDS)对淀粉胶胶接强度和低温储藏稳定性的影响。对比没有加入SDS的淀粉胶,加入SDS后胶的粘结强度均有所提高,最佳添加量为淀粉用量的1%,此时干强度提高了60.1%,湿强度提高了211.5%。此外,SDS可以有效地提高反应的接枝参数,接枝率提高了93.7%,接枝百分率提高了83.8%。耐低温稳定性实验证明,加入乳化剂可以增加淀粉胶通过冷藏-解冻循环的次数。动态时间扫描实验和TEM的结果证明,加入SDS有利于削弱淀粉分子之间的氢键作用力,促进淀粉与单体之间发生接枝反应,从而改善了淀粉胶乳液的粘结性能及稳定性。     

Verklebung von Buchenholz für tragende Holzbauteile

The load bearing capacity of glulam could be enhanced by using lamella of European beech (Fagus sylvatica??L.). Essential requirements for the production of those beams are adhesives which allow for a durable und reliable bonding of lamella. The paper shows to what extent commercially available MUF and PU adhesives and adapted bonding parameters ensure gluing of European beech timber for load-bearing timber structures. Both beech wood containing heartwood and beech wood without heartwood were included in the study. With regard to technical approval, the chosen test methods were resistance to delamination according to EN??302-2 (2002) and shear test of glue line according to EN??392 (1995). From the two tested MUF systems it was evident, that delamination decreased by increasing the closed assembly time. The requirements of EN??301 (2006) were fulfilled for adhesive type??I and??II. Without any limitations beech wood containing heartwood could be glued using MUF-1. On the other hand, the results of the PU adhesive were insufficient. Light-optical micrograph examinations show that long assembly times secure the formation of a glue line. It was assumed that the curing process is retarded by beech wood. No relationship was found between the results of the shear strength test and the delamination test. For quality control of glulam the delamination test is recommended. Based on the positive results an application for technical approval of glulam consisting of beech was made. For this reason beech-glulam can be generally utilized in service class??1.     

Bonding performance of heat treated wood with structural adhesives

Bonding of untreated, intermediate (hydro-thermolysed) and heat treated wood with melamine-urea-formaldehyde (MUF), phenol-resorcinol-formaldehyde (PRF) and polyurethane (PUR) adhesives was studied. An industrial heat treatment process (Plato ^®) was used, which included two separate heat treatment stages and a drying stage in-between. Laminated beams having four lamellas were prepared from untreated and treated timber for mechanical testing of the bond lines. The results of the tests showed that heat treatment affected the shear strength and the delamination of the laminated wood depending on the adhesive system used for bonding. The PUR and MUF adhesives performed in a rather similar way, and better than the PRF adhesive. The shear strength of laminated wood bonded with the waterborne MUF and PRF adhesives decreased for the specimens made of hydro-thermolysed timber and decreased further for the specimens made of fully heat treated timber. The difference in adhesive bond shear strength between untreated, intermediate and fully treated wood was less obvious in the case of the PUR adhesive. Delamination of the PRF bond line decreased drastically for all the specimens made of heat treated timber.