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November 2020最新文献

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Multifunctional barrier coating systems created by multilayer curtain coating 由多层窗帘涂层创造的多功能屏障涂层系统
Pub Date : 2020-12-01 DOI: 10.32964/tj19.11.561
D. Ventresca, G. Welsch
Functional coatings are applied to paper and paperboard substrates to provide resistance, or a barrier, against media such as oil and grease (OGR), water, water vapor as measured by moisture vapor transmission rate (MVTR), and oxygen, for applications such as food packaging, food service, and other non-food packaging. Typical functional barrier coatings can be created by applying a solid coating or extruded film, a solvent based-coating, or a water-based coating to the paper substrate using various means of coating applicators.This paper focuses on water-based barrier coatings (WBBC) for OGR, water, MVTR, and oxygen barriers. The main goal was to create coated systems that can achieve more than one barrier property using multilayer curtain coating (MLCC). Curtain coating has emerged as the premier low-impact application method for coated paper and paperboard. This paper provides examples using MLCC to create coating structures that provide multiple barrier properties in a single coating step. Barrier polymer systems studied include styrene butadiene, styrene acrylate, vinyl acrylic, and natural materials, as well as proprietary additives where required to give desired performance. The paper also shows how the specific coating layers can be optimized to produce the desired property profile, without concern for blocking, as the addition of a non-blocking top layer can be applied in the MLCC structure as well. Experiments on base sheet types also shows the importance of applying the multilayer structure on a pre-coated surface in order to improve coating thickness consistency and potentially allow for the reduction of more expensive layer components.
功能涂料应用于纸和纸板基材,以提供抵抗介质,如油和油脂(OGR),水,通过湿气透过率(MVTR)测量的水蒸气和氧气,用于食品包装,食品服务和其他非食品包装等应用。典型的功能屏障涂层可以通过使用各种涂层涂布器将固体涂层或挤出膜、溶剂型涂层或水性涂层涂到纸基材上而产生。本文主要研究了用于OGR、水、MVTR和氧屏障的水基阻隔涂料(WBBC)。主要目标是创建涂层系统,使用多层窗帘涂层(MLCC)可以实现多种屏障性能。窗帘涂布已成为铜版纸和纸板的首选低影响涂布方法。本文提供了使用MLCC创建在单个涂层步骤中提供多种阻隔性能的涂层结构的示例。所研究的阻隔聚合物系统包括丁二烯、丙烯酸酯、乙烯基丙烯酸和天然材料,以及需要提供所需性能的专有添加剂。本文还展示了如何优化特定涂层以产生所需的性能轮廓,而无需担心阻塞,因为添加非阻塞顶层也可以应用于MLCC结构。对基板类型的实验也显示了在预涂覆表面上应用多层结构的重要性,以提高涂层厚度的一致性,并有可能减少更昂贵的层组件。
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引用次数: 0
Numerical analysis of slot die coating of nanocellulosic materials 纳米纤维素材料槽模涂层的数值分析
Pub Date : 2020-12-01 DOI: 10.32964/tj19.11.575
Fuaad Panikaveetil, Ahamed Kutty, Rajesh Koppolu, A. Swerin, F. Lundell, M. Toivakka
Nanocellulosic coatings as a food packaging material are of commercial interest due to their nontoxic nature, renewability, and excellent barrier properties. Complex shear-thinning rheology poses challenges in designing and sizing equipment to pump, mix, and process the suspension and actual coating process. This study aims to determine the effectiveness of computational fluid dynamics (CFD) in predicting nanocellulosic suspension flow in light of existing rheological data. We employ and compare three distinct rheological models to characterize the rheology and flow of nanocellulose suspensions through a slot die coater, where the model parameters are established from existing slot rheometry measurements. A volume-of-fluid (VoF) based finite volume method is employed to simulate the flow in a slot die operated in an unconventional metering mode. Results with the Casson model predict the presence of unyielded regions in the flow, which was not captured using the power law model. These stagnation regions will incur coatability issues stemming from flow intermittencies and lead to potential defects in the coating layer, including fracture. The results suggest that a rheological model that includes yield stress should be considered while modeling such flows. A need for better rheological data to model nanocellulosic flows, especially at high consistencies and shear rates, is also highlighted.
纳米纤维素涂料作为一种食品包装材料,由于其无毒、可再生和优异的阻隔性能而具有商业价值。复杂的剪切减薄流变对泵送、混合、处理悬浮液和实际涂层过程的设计和施胶设备提出了挑战。本研究旨在确定计算流体力学(CFD)在预测纳米纤维素悬浮液流动方面的有效性。我们采用并比较了三种不同的流变模型来表征纳米纤维素悬浮液通过槽模涂布机的流变学和流动,其中模型参数是根据现有的槽流变测量建立的。采用基于流体体积(VoF)的有限体积法对非常规计量模式下的槽形模具内部流动进行了数值模拟。卡森模型的结果预测了流动中未屈服区域的存在,而幂律模型没有捕捉到这一点。这些滞止区会产生由流动间歇引起的涂层性问题,并导致涂层出现潜在缺陷,包括破裂。结果表明,在模拟此类流动时应考虑包含屈服应力的流变模型。还强调需要更好的流变学数据来模拟纳米纤维素流动,特别是在高稠度和剪切速率下。
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引用次数: 2
The use of hollow sphere pigments as strength additives in paper and paperboard coatings—Part 2: Optimization in paperboard formulations for opacity and strength 纸和纸板涂料中用作强度添加剂的空心球颜料的使用。第2部分:纸板不透明度和强度配方的优化
Pub Date : 2020-12-01 DOI: 10.32964/tj19.11.597
B. Einsla, Ethan C Glor, J. Roper, Jeff Leitinger, Nick Nicholas, S. Woodfin
This report aims to summarize the efforts in testing the properties of coatings for paperboard utilizing hollow sphere pigments (HSPs). HSPs are known to effectively scatter light and replace titanium dioxide (TiO2) in architectural coating formulations. The effect of the particle size and void fraction was evaluated, along with many coating parameters, including level of addition, binder chemistry, and blends of two HSPs. The small HSPs that have optimized voids for scattering light showed equivalent strength to the TiO2-containing control. The strength data was surprising, particularly the improvement in strength for coatings containing large particle size HSPs. Because of this increase in strength, four parts of binder could be removed, which allowed for higher brightness while not compromising other properties, including hot melt glueability. These trends held true using different binder chemistries (styrene acrylic, vinyl acrylic, and styrene butadiene). Upon refining the formulations further, blends of two HSPs showed further benefit.
本文综述了国内外利用空心球颜料(HSPs)测试纸板涂料性能的研究进展。已知热敏感蛋白可以有效地散射光,并在建筑涂料配方中取代二氧化钛(TiO2)。评估了颗粒大小和空隙率的影响,以及许多涂层参数,包括添加水平、粘合剂化学性质和两种HSPs的混合物。具有优化孔洞的小HSPs散射光的强度与含tio2的对照相当。强度数据令人惊讶,特别是含有大粒径HSPs的涂层强度的提高。由于这种强度的增加,粘合剂的四个部分可以被去除,这允许更高的亮度,同时不影响其他性能,包括热熔胶合性。这些趋势适用于不同的粘合剂化学(苯乙烯丙烯酸,乙烯基丙烯酸和苯乙烯丁二烯)。在进一步精炼配方后,两种HSPs的混合物显示出进一步的益处。
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引用次数: 0
The use of hollow sphere pigments as strength additives in paper and paperboard coatings—Part 1: The predictive nature of packing models on coating properties 中空球体颜料作为强度添加剂在纸和纸板涂料中的应用。第1部分:填料模型对涂料性能的预测性质
Pub Date : 2020-12-01 DOI: 10.32964/tj19.11.585
Ethan C Glor, B. Einsla, J. Roper, Jian Yang, V. Ginzburg
Hollow sphere pigments (HSPs) are widely used at low levels in coated paper to increase coating bulk and to provide gloss to the final sheet. However, HSPs also provide an ideal system through which one can examine the effect of pigment size and particle packing within a coating due to their unimodal and tunable particle sizes. The work presented in Part 1 and Part 2 of this study will discuss the use of blends of traditional inorganic pigments and HSPs in coating formulations across a variety of applications for improved coating strength. Part 1 of this study focuses on the theory of bimodal spherical packing and demonstrates the predictive nature of packing models on the properties of coating systems containing HSPs of two different sizes. This study also examines conditions where the model fails by examining the effect of particle size on coating strength in sytems like thermal paper basecoats where the non-HSP component has a broad particle size distribution, and how these surprising trends can be used to generate better-than-expected thermal printing performance in systems with low HSP/clay ratios. Part 2 of this study focuses on the incorporation of HSPs of different particle sizes into paperboard formulations to affect coating strength and opacity.
空心球颜料(HSPs)在涂布纸中广泛应用于低水平,以增加涂层体积并为最终纸张提供光泽。然而,HSPs也提供了一个理想的系统,通过该系统,人们可以检查涂料中颜料大小和颗粒填充的影响,因为它们的单峰和可调的颗粒大小。在本研究的第1部分和第2部分中介绍的工作将讨论在各种应用中使用传统无机颜料和热敏感蛋白的混合物来提高涂层强度。本研究的第一部分侧重于双峰球形填充理论,并展示了填充模型对包含两种不同尺寸的热敏聚合物的涂层系统性能的预测性质。本研究还检查了模型失败的情况,通过检查非热sp成分具有广泛粒径分布的热敏纸底漆等系统中粒径对涂层强度的影响,以及如何使用这些令人惊讶的趋势在低热sp /粘土比的系统中产生优于预期的热敏印刷性能。本研究的第2部分侧重于将不同粒径的热敏感蛋白加入纸板配方中,以影响涂层强度和不透明度。
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引用次数: 0
Pigmented aqueous barrier coatings 颜料性水性阻隔涂料
Pub Date : 2020-12-01 DOI: 10.32964/tj19.11.551
A. Lyons, G. Reed
The desire for more sustainable packaging has led to the development of new packaging materials that are fiber based. Aqueous coatings are a pathway to improve the recyclability of these materials. Pigments used in these coatings can improve the performance of the coating and reduce cost while further improving the recyclability. Mineral pigments are also considered to be compost neutral. In this paper, we provide the reader a better fundamental understanding of the mechanisms by which pigments work in barrier coatings. A pigment’s mineralogy and physical characteristics are important to how it will perform, and there have been recent pigment developments that improve coating performance. This paper shows that some pigments are better than others in particular barrier applications. Also, pigmented base or pre-coats can be used to prepare the surface for more highly functional coatings that go on top, improving the barrier function of packaging material and reducing overall cost. Finally, the converting operation is of major importance in driving formulation choices for barrier applications.
对更可持续包装的渴望导致了以纤维为基础的新包装材料的发展。水性涂料是提高这些材料可回收性的一种途径。这些涂料中使用的颜料可以提高涂料的性能,降低成本,同时进一步提高可回收性。矿物颜料也被认为是堆肥中性的。在本文中,我们为读者提供了一个更好的基本理解的机制,颜料的工作在屏障涂料。颜料的矿物学和物理特性对它的性能很重要,最近颜料的发展改善了涂层的性能。本文表明,在特定的屏障应用中,一些颜料比其他颜料更好。此外,色素基底或预涂层可用于在表面制备功能更强的涂层,从而提高包装材料的阻隔功能并降低总体成本。最后,转换操作对驱动屏障应用的配方选择非常重要。
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引用次数: 1
A Secure Method for Managing Data in CloudStorage using Deduplication and Enhanced FuzzyBased Intrusion Detection Framework 基于重复数据删除和增强模糊入侵检测框架的云存储数据安全管理方法
Pub Date : 2020-11-30 DOI: 10.46501/ijmtst061131
A. HemaSandDr.Kangaiammal
Cloud services increase data availability so as to offer flawless service to the client. Because of increasingdata availability, more redundancies and more memory space are required to store such data. Cloudcomputing requires essential storage and efficient protection for all types of data. With the amount of dataproduced seeing an exponential increase with time, storing the replicated data contents is inevitable. Hence,using storage optimization approaches becomes an important pre-requisite for enormous storage domainslike cloud storage. Data deduplication is the technique which compresses the data by eliminating thereplicated copies of similar data and it is widely utilized in cloud storage to conserve bandwidth andminimize the storage space. Despite the data deduplication eliminates data redundancy and datareplication; it likewise presents significant data privacy and security problems for the end-user. Consideringthis, in this work, a novel security-based deduplication model is proposed to reduce a hash value of a givenfile size and provide additional security for cloud storage. In proposed method the hash value of a given file isreduced employing Distributed Storage Hash Algorithm (DSHA) and to provide security the file is encryptedby using an Improved Blowfish Encryption Algorithm (IBEA). This framework also proposes the enhancedfuzzy based intrusion detection system (EFIDS) by defining rules for the major attacks, thereby alert thesystem automatically. Finally the combination of data exclusion and security encryption technique allowscloud users to effectively manage their cloud storage by avoiding repeated data encroachment. It also savesbandwidth and alerts the system from attackers. The results of experiments reveal that the discussedalgorithm yields improved throughput and bytes saved per second in comparison with other chunkingalgorithms.
云服务增加了数据的可用性,从而为客户提供完美的服务。由于数据可用性的增加,需要更多的冗余和更多的内存空间来存储这些数据。云计算需要对所有类型的数据进行必要的存储和有效的保护。随着产生的数据量随着时间呈指数级增长,存储复制的数据内容是不可避免的。因此,使用存储优化方法成为巨大存储域(如云存储)的重要先决条件。重复数据删除是一种通过消除相似数据的重复副本来压缩数据的技术,它广泛应用于云存储中,以节省带宽和最小化存储空间。尽管重复数据删除消除了数据冗余和数据应用;它同样给最终用户带来了严重的数据隐私和安全问题。考虑到这一点,在这项工作中,提出了一种新的基于安全的重复数据删除模型,以减少给定文件大小的哈希值,并为云存储提供额外的安全性。该方法采用分布式存储哈希算法(DSHA)减少给定文件的哈希值,并使用改进的河豚加密算法(IBEA)对文件进行加密以提供安全性。该框架还提出了一种增强的基于模糊的入侵检测系统(EFIDS),通过对主要攻击定义规则,从而自动报警系统。最后,将数据排除技术与安全加密技术相结合,使云用户能够有效地管理其云存储,避免数据的重复入侵。它还可以节省带宽并提醒系统免受攻击者的攻击。实验结果表明,与其他分块算法相比,所讨论的算法产生了更高的吞吐量和每秒节省的字节数。
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引用次数: 1
Hall and Ion Slip Influence on Mixed ConvectiveMagnetohydrodynamic Oscillatory Flow through aPermeable Medium in Presence of ThermalDiffusion 热扩散条件下霍尔和离子滑移对可渗透介质混合对流磁流体振荡流动的影响
Pub Date : 2020-11-23 DOI: 10.46501/ijmtst061106
S. Aiswarya
The aim of this study is to analyze the effect of Hall and ion slip on viscous incompressible electricallyconducting fluid bounded by a vertical porous plate in the presence of chemical reaction and thermalradiation subject to oscillatory suction. The resulting coupled non-linear partial differential equations aresolved analytically by applying perturbation technique. The influences of various non-dimensionalparameters on velocity, temperature and concentration profiles were discussed numerically.
本研究的目的是分析霍尔滑移和离子滑移对以垂直多孔板为界的粘性不可压缩导电流体在振荡吸力作用下的化学反应和热辐射的影响。应用微扰技术对得到的非线性耦合偏微分方程进行了解析求解。数值分析了各种非量纲参数对速度、温度和浓度分布的影响。
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引用次数: 0
Hall and Ion Slip Influence on Mixed ConvectiveMagnetohydrodynamic Oscillatory Flow through aPermeable Medium in Presence of ThermalDiffusion 热扩散条件下霍尔和离子滑移对可渗透介质混合对流磁流体振荡流动的影响
Pub Date : 2020-11-23 DOI: 10.46501/jmtst061106
S. Aiswarya
The aim of this study is to analyze the effect of Hall and ion slip on viscous incompressible electricallyconducting fluid bounded by a vertical porous plate in the presence of chemical reaction and thermalradiation subject to oscillatory suction. The resulting coupled non-linear partial differential equations aresolved analytically by applying perturbation technique. The influences of various non-dimensionalparameters on velocity, temperature and concentration profiles were discussed numerically.
本研究的目的是分析霍尔滑移和离子滑移对以垂直多孔板为界的粘性不可压缩导电流体在振荡吸力作用下的化学反应和热辐射的影响。应用微扰技术对得到的非线性耦合偏微分方程进行了解析求解。数值分析了各种非量纲参数对速度、温度和浓度分布的影响。
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引用次数: 0
A Semantic Text Summarization Method usingontology based Knowledge 基于本体知识的语义文本摘要方法
Pub Date : 2020-11-23 DOI: 10.46501/ijmtst061122
Dr.A.Mekala
Data mining is a method which finds useful patterns from large amount of data. As vast amounts ofinformation are created quickly, effective information access becomes an important matter. Particularly forimportant domains, such as health check and monetary areas, well-organized recovery of succinct andrelated information is highly desired. In this paper we propose a new user query based text summarizationtechnique that makes use of WordNet, a common information source from Princeton University. Oursummarization structure is expressly tuned to recapitulate health care documents.
数据挖掘是一种从大量数据中发现有用模式的方法。随着大量信息的快速产生,有效的信息访问成为一件重要的事情。特别是对于重要的领域,如健康检查和货币领域,非常需要对简洁和相关的信息进行有组织的恢复。本文提出了一种新的基于用户查询的文本摘要技术,该技术利用了来自普林斯顿大学的常用信息源WordNet。我们的摘要结构被明确地调整为概括医疗保健文件。
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引用次数: 0
Traffic Signs Detection Using Machine LearningAlgorithms 使用机器学习算法的交通标志检测
Pub Date : 2020-11-23 DOI: 10.46501/ijmtst061119
Yugam Bajaj and Shallu Bashambu
With the rapid advancement and developments in the Automobile industry, that day is not far when eachof us would be owning their own Autonomous Vehicle. Although manufacturing of a full proof AutonomousVehicle has its own fair share of challenges. The main challenge that lies in front of us, is imbibing the latesttechnologies and advancements into the conventional vehicles we already have. This paper discusses onesuch technology that we can incorporate in our vehicle, to direct the Conventional Vehicle into becoming anAutonomous Vehicle in future. The user would be able to classify Traffic Signs on Road, which would helphim/her to understand what that sign signifies, i.e. what rules the driver must follow while driving on thatparticular road.We use Machine Learning Classification Algorithms like k-Nearest Neighbors, Random Forest and SupportVector Machine on our dataset, to compute the best accuracies in the process as well.
随着汽车工业的快速发展和发展,我们每个人都拥有自己的自动驾驶汽车的那一天已经不远了。尽管制造一辆完全验证的自动驾驶汽车也面临着相当大的挑战。摆在我们面前的主要挑战是,如何将最新的技术和进步融入到我们现有的传统交通工具中。本文讨论了一种我们可以将这种技术整合到我们的车辆中,以指导传统车辆在未来成为自动驾驶车辆。用户将能够对道路上的交通标志进行分类,这将帮助他/她理解该标志的含义,即驾驶员在该特定道路上驾驶时必须遵守的规则。我们在数据集上使用机器学习分类算法,如k近邻,随机森林和支持向量机,来计算过程中的最佳精度。
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引用次数: 2
期刊
November 2020
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