November 2020最新文献

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

November 2020 Pub Date : 2020-12-01 DOI: 10.32964/tj19.11.561

D. Ventresca, G. Welsch

{"title":"Multifunctional barrier coating systems created by multilayer curtain coating","authors":"D. Ventresca, G. Welsch","doi":"10.32964/tj19.11.561","DOIUrl":"https://doi.org/10.32964/tj19.11.561","url":null,"abstract":"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.\u0000This 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. \u0000This 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.","PeriodicalId":277149,"journal":{"name":"November 2020","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114244201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

November 2020 Pub Date : 2020-12-01 DOI: 10.32964/tj19.11.575

Fuaad Panikaveetil, Ahamed Kutty, Rajesh Koppolu, A. Swerin, F. Lundell, M. Toivakka

{"title":"Numerical analysis of slot die coating of nanocellulosic materials","authors":"Fuaad Panikaveetil, Ahamed Kutty, Rajesh Koppolu, A. Swerin, F. Lundell, M. Toivakka","doi":"10.32964/tj19.11.575","DOIUrl":"https://doi.org/10.32964/tj19.11.575","url":null,"abstract":"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. \u0000This 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.","PeriodicalId":277149,"journal":{"name":"November 2020","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126869708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

November 2020 Pub Date : 2020-12-01 DOI: 10.32964/tj19.11.597

B. Einsla, Ethan C Glor, J. Roper, Jeff Leitinger, Nick Nicholas, S. Woodfin

{"title":"The use of hollow sphere pigments as strength additives in paper and paperboard coatings—Part 2: Optimization in paperboard formulations for opacity and strength","authors":"B. Einsla, Ethan C Glor, J. Roper, Jeff Leitinger, Nick Nicholas, S. Woodfin","doi":"10.32964/tj19.11.597","DOIUrl":"https://doi.org/10.32964/tj19.11.597","url":null,"abstract":"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 \u0000coating parameters, including level of addition, binder chemistry, and blends of two HSPs. \u0000The 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.","PeriodicalId":277149,"journal":{"name":"November 2020","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133082577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

November 2020 Pub Date : 2020-12-01 DOI: 10.32964/tj19.11.585

Ethan C Glor, B. Einsla, J. Roper, Jian Yang, V. Ginzburg

{"title":"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","authors":"Ethan C Glor, B. Einsla, J. Roper, Jian Yang, V. Ginzburg","doi":"10.32964/tj19.11.585","DOIUrl":"https://doi.org/10.32964/tj19.11.585","url":null,"abstract":"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. \u0000The 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. \u0000This 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. \u0000Part 2 of this study focuses on the incorporation of HSPs of different particle sizes into paperboard formulations to affect coating strength and opacity.","PeriodicalId":277149,"journal":{"name":"November 2020","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115534393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pigmented aqueous barrier coatings 颜料性水性阻隔涂料

November 2020 Pub Date : 2020-12-01 DOI: 10.32964/tj19.11.551

A. Lyons, G. Reed

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

November 2020 Pub Date : 2020-11-30 DOI: 10.46501/ijmtst061131

A. HemaSandDr.Kangaiammal

{"title":"A Secure Method for Managing Data in Cloud\u0000Storage using Deduplication and Enhanced Fuzzy\u0000Based Intrusion Detection Framework","authors":"A. HemaSandDr.Kangaiammal","doi":"10.46501/ijmtst061131","DOIUrl":"https://doi.org/10.46501/ijmtst061131","url":null,"abstract":"Cloud services increase data availability so as to offer flawless service to the client. Because of increasing\u0000data availability, more redundancies and more memory space are required to store such data. Cloud\u0000computing requires essential storage and efficient protection for all types of data. With the amount of data\u0000produced seeing an exponential increase with time, storing the replicated data contents is inevitable. Hence,\u0000using storage optimization approaches becomes an important pre-requisite for enormous storage domains\u0000like cloud storage. Data deduplication is the technique which compresses the data by eliminating the\u0000replicated copies of similar data and it is widely utilized in cloud storage to conserve bandwidth and\u0000minimize the storage space. Despite the data deduplication eliminates data redundancy and data\u0000replication; it likewise presents significant data privacy and security problems for the end-user. Considering\u0000this, in this work, a novel security-based deduplication model is proposed to reduce a hash value of a given\u0000file size and provide additional security for cloud storage. In proposed method the hash value of a given file is\u0000reduced employing Distributed Storage Hash Algorithm (DSHA) and to provide security the file is encrypted\u0000by using an Improved Blowfish Encryption Algorithm (IBEA). This framework also proposes the enhanced\u0000fuzzy based intrusion detection system (EFIDS) by defining rules for the major attacks, thereby alert the\u0000system automatically. Finally the combination of data exclusion and security encryption technique allows\u0000cloud users to effectively manage their cloud storage by avoiding repeated data encroachment. It also saves\u0000bandwidth and alerts the system from attackers. The results of experiments reveal that the discussed\u0000algorithm yields improved throughput and bytes saved per second in comparison with other chunking\u0000algorithms.","PeriodicalId":277149,"journal":{"name":"November 2020","volume":"85 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116510940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

November 2020 Pub Date : 2020-11-23 DOI: 10.46501/ijmtst061106

S. Aiswarya

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

November 2020 Pub Date : 2020-11-23 DOI: 10.46501/jmtst061106

S. Aiswarya

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

November 2020 Pub Date : 2020-11-23 DOI: 10.46501/ijmtst061122

Dr.A.Mekala