On the warping behaviour of particleboards coated with melamine formaldehyde resin impregnated papers

Impregnated papers are widely used as decorative, protective and balance sheets in decorative laminates for the furniture, flooring and building industries. One important property of such composites is their warping behaviour. Especially for laminate flooring, warping of the lamellae is undesirable. In the present study the influence of important process parameters in the manufacturing of impregnated papers is quantitatively analyzed based on an industrial experiment carried out at an Austrian impregnation plant. Catalyst concentration, moisture content, resin loading and base paper supplier were varied according to an experimental design. The thermal properties of the impregnated papers and the warping behaviour of the corresponding boards were evaluated using response surface methodology. The resulting models allowed quantifying the relative importance of single factors on composite warp and defining the useful working range. Determination of the thermal properties of impregnated papers using DSC and TMA was not sufficient to predict laminate warp.     

Dynamic mechanical properties of decorative papers impregnated with melamine formaldehyde resin

Papers impregnated with melamine formaldehyde based resins are widely used in decorative surface finishing of engineered wood based panels for indoor and outdoor applications. For cost-effective production of high-quality impregnated papers it is of great importance to understand the complex interplay between manufacturing conditions and technological property profile. In the present study, three raw papers from different suppliers were impregnated with melamine formaldehyde resin in an industrial scale experiment to study the influence of some important manufacturing variables on the processability of impregnated papers. As numerical factors the resin loading, the final moisture content and the amount of curing catalyst were systematically varied according to a statistical central composite design. The model papers were analyzed for their rheological and thermal properties using the dynamic mechanical method developed by Golombek. As target values flow time, cure time, curing rate and flexibility were used to calculate quantitative models for the processability of the impregnated papers using response surface methodology. It is shown that the relevant rheological and thermal paper parameters are significantly influenced by the supplier of the raw paper as well as the manufacturing variables.     

浸渍纸主要性能指标对强化木地板压贴质量的影响

介绍了浸渍纸的浸胶量、挥发物含量、流展、预固化度等主要性能指标的概念及其检测方法;探讨了这些性能指标对强化木地板压贴质量的影响,并提出了适合强化木地板压贴的浸渍纸的主要性能指标范围,以及浸渍纸性能指标相对超范围时的压贴工艺调整方向。     

强化木地板生产工艺概述

介绍强化木地板生产的耐磨纸、装饰纸、平衡纸、高密度纤维板的质量要求和生产工艺控制。分析讨论了强化木地板的甲醛释放量和翘曲变形问题。     

Factors influencing the processing and technological properties of laminates based on phenolic resin impregnated papers

High quality decorative laminate panels typically consist of two major types of components: the surface layers comprising décor and overlay papers that are impregnated with melamine-based resins, and the core which is made of stacks of kraft papers impregnated with phenolic (PF) resin. The PF-impregnated layers impart superior hydrolytic stability, mechanical strength and fire-resistance to the composite. The manufacturing involves the complex interplay between resin, paper and impregnation/drying processes. Changes in the input variables cause significant alterations in the process characteristics and adaptations of the used materials and specific process conditions may, in turn, be required. This review summarizes the main variables influencing both processability and technological properties of phenolic resin impregnated papers and laminates produced therefrom. It is aimed at presenting the main influences from the involved components (resin and paper), how these may be controlled during the respective process steps (resin preparation and paper production), how they influence the impregnation and lamination conditions, how they affect specific aspects of paper and laminate performance, and how they interact with each other (synergies).     

树脂固化度对强化木地板性能的影响

通过对强化木地板(“两纸一板”工艺压贴)浸渍纸树脂固化度的测试,分析热压时间长短对浸渍纸树脂固化度的影响,进而分析浸渍纸树脂固化度对地板耐磨性能和甲醛释放量的影响。     

几种实木地板和单板层积材尺寸稳定性的初步研究

实木地板的尺寸变化经常引起地板的翘曲、开裂、变形等问题.本研究就是通过模拟室内环境条件,把几种实木地板和单板层积材置于温度相同而湿度不同的两种实验环境下,找出其尺寸在长度和厚度方向上的变化规律,以期对今后地板的生产和铺装起到一定的作用.     

纯棉提花色织产品的设计与生产

为了在普通多臂织机上开发花形较大、装饰效果较强的提花织物,进行了织物组织的设计、经纬纱排列方式及穿综和穿筘方法的优选;通过在分条整经、绞纱上浆及提花织造等各工艺流程严格控制经纱张力,合理设计各工序工艺参数、采取相应的技术措施,在经过改造的多臂织机上设计开发出了纯棉提花色织产品;所开发的产品具有较好的装饰效果及实物质量.     

Improving hydrophobic and oleophobic performances of high-pressure laminates

High-pressure laminates are decorative materials that are widely used in furnishing and building industries. One of their major handicaps, especially in the case of high gloss laminates, is the ease of staining by fingerprints. This problem can a priori be minimized by increasing the hydrophobicity and oleophobicity of the surface. To improve hydrophobicity, the chemical composition of the resin used for impregnation of the laminate’s top layer decorative paper was modified. A melamine-benzoguanamine-formaldehyde resin was used as starting point, and caprinoguanamine was added as a comonomer at different stages of the synthesis. Addition at the end of the synthesis process showed to be the most promising approach for achieving a water contact angle of 91.2°, while the contact angle for a commercial laminate, impregnated with a standard melamine–formaldehyde resin, is 58°. Regarding oleophobicity, several commercial additives were tested with the previously formulated resin. A fluorocarbon additive showed the best result, leading to contact angles of 114° for water and 76° for an artificial fingerprint liquid. In addition, it was shown that fingerprints were easier to clean from the modified laminate surface.     

On the performance of a melamine–urea–formaldehyde resin for decorative paper coatings

The decorative laminates industry is a highly competitive industrial sector. To be profitable, manufacturers of impregnated papers for surface laminated MDF and particleboards need to significantly reduce their production costs. Melamine formaldehyde resin (MF) formulations are commonly used for impregnation and coating of such papers, melamine being an important, but costly raw material used in high quantities. While MF is substituted by cheaper urea formaldehyde resins (UF) in the core impregnation, for paper surface films pure MF is used. Therefore, a further reduction in cost could be achieved if a portion of the melamine in the surface film was replaced by urea. In the present contribution, recent results of technological tests on paper laminates using a novel melamine–urea–formaldehyde resin (MUF) formulation are reported and their performance is compared to traditional surfaces made from MF.     

经编超弹麻花起绒面料的设计与生产

采用涤纶+阳离子涤纶复合丝与氨纶纤维,在卡尔.迈耶HKS2-3型特里科经编机上开发经编超弹麻花起绒面料,介绍了其织造工艺、整经与织造技术要点、染整工艺与技术要点,如氨纶丝两伸两缩处理,整经工艺控制,以及坯布松弛处理,织物碳刷与起绒等,并对面料的延伸性进行了测试。结果表明:该面料具有良好的弹性和延伸性、柔软舒适、毛感丰富,是制作休闲运动装、保暖内衣、健身服等的理想面料。     

强化木地板的VOCs散发试验研究

采用大环境舱模拟实际室内空气环境，研究室内装修用强化木地板甲醛的散发规律，并研究环境因素对处于稳定散发期的木地板甲醛散发的影响，同时对VOCs化学成分进行检测。研究结果有助于人们对强化木地板的正确认识和正确使用。     

胶黏剂种类对人造板内结合强度检测结果的影响

使用聚乙酸乙烯酯乳液（PVAc）、单组份聚氨酯（PUR）和热熔胶（EVA）3种胶黏剂粘结金属卡头与试件,检测并分析它们对强化木地板和地板基材用纤维板内结合强度检测结果的影响。结果表明：使用PUR粘结时检测的内结合强度值比使用PVAc、EVA高,其中强化木地板内结合强度高出0.47MPa,地板基材用纤维板内结合强度高出约0.40MPa。     

样品整经机的工作原理及技术特点

样品整经机是一种全新的整经设备,即最少只用1只筒子经过整经即可形成织轴,是用于织造包袱样、米样和小批量产品进行整经的专用设备.这种整经方式可大大减少整经筒子量,简化工艺流程,降低生产成本,减少出样时间,尤其适用于小批量织物生产.并且经后整理加工后得到的小样织物在风格、性能上接近批量生产的产品.文章结合国产GA 193样品整经机的特点,讨论了样品整经的基本原理,分析了样品整经机的主要机构,并对样品整经机与分条整经设备进行了技术经济分析比较.     

胶黏剂种类对人造板内结合强度检测结果的影响

使用聚乙酸乙烯酯乳液(PVAc)、单组份聚氨酯(PUR)和热熔胶(EVA)3种胶黏剂粘结金属卡头与试件,检测并分析它们对强化木地板和地板基材用纤维板内结合强度检测结果的影响。结果表明:使用PUR粘结时检测的内结合强度值比使用PVAc、EVA高,其中强化木地板内结合强度高出0.47MPa,地板基材用纤维板内结合强度高出约0.40MPa。     

金属丝整经装备及发展现状

整经是重要的织前工艺,决定了织物的质量。与金属丝整经相关研究较少,本文特别针对金属丝整经装备及其发展现状,首先介绍了金属丝整经的工艺要求和整经设备的两个组成部分,具体分析了矩形金属丝整经筒子架和V形金属丝整经筒子架特点,并阐述了金属丝整经机架构成原理及片纱张力控制原理。然后总结了金属丝整经装备的国内外发展现状和发展趋势。     

低温地板辐射采暖系统特点及木地板在其中的应用

介绍了低温地板辐射采暖系统,并针对该系统的特点,对其中的木地板进行了导热性、尺寸稳定性、耐久性、环保性等主要性能的分析。     

短纤纱经编织物生产关键技术研究进展

针对短纤纱经编生产强力低、毛羽多、延伸小、捻度大以及成本高等问题,总结了短纤纱经编生产中的整经技术、高速生产技术、清洁生产技术、智能生产技术和全成形经编生产技术的发展及生产应用。通过梳理经编用短纤纱成纱质量要求,包括纱线断裂强度、表面毛羽和延伸性能等,进一步分析了短纤纱经编整经技术、短纤纱经编织造技术存在的问题和解决方法。通过介绍短纤纱经编产品在衬衫面料、内衣面料、裤料、蕾丝面料领域的应用现状以及生产情况,对短纤纱经编技术未来发展方向进行展望,指出了短纤纱经编生产技术将持续向特色化、高档化和功能化方向发展。     

北京奥丽安特装饰材料有限公司

奥丽特地板——出口北美，澳大利亚的中国品牌     

强化木地板生产工艺概述

介绍强化木地板生产的耐磨纸、装饰纸、平衡纸、高密度纤维板的质量要求和生产工艺控制。分析讨论了强化木地板的甲醛释放量和翘曲变形问题。