November 2023最新文献

Multilayering of conventional latex-based dispersion coatings containing small amounts of silica nanospheres: Runnability on a pilot scale flexographic coater and barrier performance 含有少量二氧化硅纳米球的传统乳胶基分散涂料的多层涂布：中试规模柔版涂布机的运行性能和阻隔性能

November 2023 Pub Date : 2023-12-01 DOI: 10.32964/tj22.11.675

Beko Mesic, James H. Johnston

{"title":"Multilayering of conventional latex-based dispersion coatings containing small amounts of silica nanospheres: Runnability on a pilot scale flexographic coater and barrier performance","authors":"Beko Mesic, James H. Johnston","doi":"10.32964/tj22.11.675","DOIUrl":"https://doi.org/10.32964/tj22.11.675","url":null,"abstract":"The addition of functional coatings to packaging materials is a key requirement for increasing their performance and creating innovative packaging solutions. Flexography, a cost-effective printing method commonly used to print information and graphics directly onto a wide variety of packaging substrates, shows good potential for applying functional coatings. In this study, conventional clay-latex coating formulations containing approximately 1.3 wt% silica nanospheres were applied to a linerboard using a pilot scale flexographic printing web press. The performance of multilayered silica nanosphere-based coatings was compared with conventional coatings containing talc and/or wax dispersion in terms of coating grammage, runnability, and barrier performance. Coating grammage increased with an increased number of coating layers and a significant decrease in both the water vapor transmission rate (WVTR) and the direct water uptake of water (Cobb 120 wettability test) was observed for coatings containing silica nanoparticles. In general, the silica nanosphere-based coatings performed better than talc-based coatings. Talc/wax-based coatings had the highest variation in surface roughness due to an uneven distribution and variations of coating layers.","PeriodicalId":506570,"journal":{"name":"November 2023","volume":"20 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139189766","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

Editorial: Special coating issue contains highlighted works from TAPPICon 2023 社论：涂层特刊包含 TAPPICon 2023 的重点作品

November 2023 Pub Date : 2023-12-01 DOI: 10.32964/tj22.11.663

Steven Ottone, Gregg Reed, Greg Welsch

引用次数: 0

Measurement and control of extensional viscosity in barrier coating dispersions 测量和控制隔离涂料分散体的扩展粘度

November 2023 Pub Date : 2023-12-01 DOI: 10.32964/tj22.11.699

Watti Lehtimäki, Andreas Schröder, Vesa Kukkamo, M. Toivakka

{"title":"Measurement and control of extensional viscosity in barrier coating dispersions","authors":"Watti Lehtimäki, Andreas Schröder, Vesa Kukkamo, M. Toivakka","doi":"10.32964/tj22.11.699","DOIUrl":"https://doi.org/10.32964/tj22.11.699","url":null,"abstract":"This study aimed to understand the effect of various rheological additives on the extensional viscosity of barrier coating dispersions, as well as to understand the role extensional viscosity plays in stabilizing a liquid curtain. The apparent extensional viscosity was measured using two devices that create accelerating flows: a capillary viscometer and an orifice rheometer. Additives tested include several polyvinyl alcohols, a high molecular weight polyethylene oxide, and carboxymethylcellulose. Extensional viscosity plays a significant role in stabilizing a liquid curtain, as it slows down hole expansion and prevents impurities and disturbances from causing holes in the first place. Some of the additives could substantially increase the extensional viscosity of the dispersions without increasing the shear viscosity outside the typical range of processability for a curtain coater. Some of the additives exhibited coil-stretch transition, meaning they start increasing extensional viscosity above a certain extension rate. Polymers with low chain lengths exhibited finite extensibility, which indicates the polymer chain has fully extended and cannot provide further extensional viscosity, even though the extending force is increased. Polymeric additives with stiff or branched chains significantly raised shear viscosity without increasing extensional viscosity. Both methods could reliably measure extensional viscosity in curtain coating barrier dispersions.","PeriodicalId":506570,"journal":{"name":"November 2023","volume":"85 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139195704","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

Impact of different calendering strategies on barrier coating pickup 不同压延策略对阻隔涂层拾取的影响

November 2023 Pub Date : 2023-12-01 DOI: 10.32964/tj22.11.665

Peter Rättö, K. Junel, Dimitar Valtakari

{"title":"Impact of different calendering strategies on barrier coating pickup","authors":"Peter Rättö, K. Junel, Dimitar Valtakari","doi":"10.32964/tj22.11.665","DOIUrl":"https://doi.org/10.32964/tj22.11.665","url":null,"abstract":"Paper was pre-calendered in a pilot scale configuration with a traditional soft nip calender and a metal belt calender. All calendering strategies reduced surface roughness and permeability of the samples, but different strategies affected the surface roughness and permeability differently. The metal belt calender seemed to have a larger effect on the large-scale variations compared to the soft nip calender. Six test points from the pilot calendered papers were chosen for laboratory coating studies. Uncalendered paper was included as reference samples. The calendered samples and the reference were pre-coated with a regular pigmented coating consisting of a ground calcium carbonate (GCC) pigment and a styrene acrylate (SA) latex. Both uncoated and pre-coated substrates were barrier coated with a polyvinyl alcohol (PVOH) in one and two layers. The coating pickup was determined gravimetrically, and the barrier properties were evaluated with TAPPI Standard Test Method T 454 grease resistance test. All samples needed two PVOH coating layers to form a grease barrier. The uncalendered sheets showed the best results with one coating layer, but this was at the expense of a higher coating pickup compared to the calendered sheets. The barrier coating pickup could be reduced by a combination of high temperature metal belt calendering and pre-coating. The high temperature and long residence time in the nip enabled plasticization of the fibers. This led to an irreversible deformation, even after water application. This meant that the smoothness obtained during calendering would be less affected by water-induced roughening during the coating operation.","PeriodicalId":506570,"journal":{"name":"November 2023","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139187782","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

Multifunctional barrier coating systems created by multilayer curtain coating 通过多层帷幕涂层创建的多功能阻隔涂层系统

November 2023 Pub Date : 2023-12-01 DOI: 10.32964/tj22.11.706

D. Ventresca, Benjamin Benz, David Eisenhauer, G. Welsch, Dustin Burton

{"title":"Multifunctional barrier coating systems created by multilayer curtain coating","authors":"D. Ventresca, Benjamin Benz, David Eisenhauer, G. Welsch, Dustin Burton","doi":"10.32964/tj22.11.706","DOIUrl":"https://doi.org/10.32964/tj22.11.706","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, water, water vapor, and oxygen, for applications such as food packaging, food service, and other non-food packaging. Today, there is increasing interest in developing recyclable and more sustainable approaches for producing these types of packages. This paper focuses on water-based barrier coatings (WBBC) for oil and grease resistance (OGR), water, moisture vapor transmission rate (MVTR), and oxygen barrier performance. The main goal is to create coated systems that can achieve more than one barrier property using multilayer curtain coating (MLCC) in a single application step. One advantage is in optimizing coating material cost with the use of functional chemistry in confined layers where performance is balanced within the coating layered structure. This allows simultaneous application of layers of different polymer types in one step to achieve the appropriate performance needs for a given barrier application. This paper provides working examples of using MLCC to create coating structures with multiple barrier properties in a single application pass. Barrier polymers studied include styrene butadiene, styrene acrylate, starch-containing emulsions, and polyvinyl alcohol. The paper also shows the effect of increasing the pigment volume concentration with platy clay or fine ground calcium carbonate on MVTR and OGR barrier properties.","PeriodicalId":506570,"journal":{"name":"November 2023","volume":"136 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139189672","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

Surface energy considerations for offset printing of coated paper and paperboard 涂布纸和纸板胶版印刷的表面能考虑因素

November 2023 Pub Date : 2023-12-01 DOI: 10.32964/tj22.11.724

J. Preston, Andrew Findlay, Jonathan Keen, Eli Gaskin

{"title":"Surface energy considerations for offset printing of coated paper and paperboard","authors":"J. Preston, Andrew Findlay, Jonathan Keen, Eli Gaskin","doi":"10.32964/tj22.11.724","DOIUrl":"https://doi.org/10.32964/tj22.11.724","url":null,"abstract":"Offset printing of coated paper involves the complex interactions of ink with a surface that is characterized by three major properties: roughness, porosity, and related pore network structure and surface chemistry (related to surface free energy [SFE]). The effects of porosity and roughness are relatively well understood and are documented in the literature, whereas the influence of surface chemistry is much less studied and therefore the focus of this paper. The key results shown include: i) Coating porosity has a negligible effect on SFE determination by contact angle using two fluids. ii) The chemistry of the latex polymer in the coating formulation dominates the influence on SFE compared to pigment, with any surface energy differences present in the pigment being almost completely masked by latex. iii) Wetting agent and corona treatment can impact water absorption rate and surface spreading of water, resulting in small differences in printability. Increasing the concentration of the surfactant on a coated surface indicates switching orientation of the surfactant molecules, giving a “step wise” printing result. When looking to improve offset printability by selection of different pigments, the variation in SFE is less important than variation in either surface roughness or porosity.","PeriodicalId":506570,"journal":{"name":"November 2023","volume":"25 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139191290","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

Use of kaolin clay in aqueous barrier coating applications 在水性阻隔涂料中使用高岭土

November 2023 Pub Date : 2023-12-01 DOI: 10.32964/tj22.11.685

Siva Devisetti, Gus Lempsink, Prakash B. Malla

{"title":"Use of kaolin clay in aqueous barrier coating applications","authors":"Siva Devisetti, Gus Lempsink, Prakash B. Malla","doi":"10.32964/tj22.11.685","DOIUrl":"https://doi.org/10.32964/tj22.11.685","url":null,"abstract":"Paper-based packaging with barrier effect, as opposed to single use plastics, is gaining more prominence for sustainability reasons. At the same time, latex- or biopolymer-based aqueous barrier coating dispersions are increasingly being adopted as a better alternative to the traditional barrier coating materials, such as wax, surface active chemicals, and polyethylene. In this work, studies were performed to determine the influence of different kaolin clays in latex binder-based aqueous coatings on barrier properties, namely, oil and grease, water resistance, and water vapor transmission rate, by applying coatings to solid bleached sulfate (SBS) paperboard substrate in the laboratory. The aim was to explore potential benefits of using kaolin clay to replace some of the latex binder in coating and improve or maintain various types of barrier performance and blocking without negatively influencing the other performance attributes, including heat seal. The delaminated clay with the highest shape factor provided improved barrier properties over the clays of low shape factor. The ultrafine and non-delaminated clays required significantly higher coat weights to reach satisfactory barrier properties. Coatings with different latex levels indicated that a considerably high proportion of coarse delaminated clay can be incorporated to replace latex binder, while still achieving exceptional barrier properties. Furthermore, a change in binder system was found to significantly alter the barrier properties and the role that a mineral pigment can play. The results indicate that a proper selection of binder systems for each barrier property would be required while considering the clay/latex coating systems.","PeriodicalId":506570,"journal":{"name":"November 2023","volume":"57 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139195726","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

Effectiveness of Self-directed Virtual Learning on Retention of Cardiopulmonary Resuscitation Knowledge and Skills among Hospital Nurses in North-western Nigeria: Protocol Paper 自主虚拟学习对尼日利亚西北部医院护士保留心肺复苏知识和技能的效果：协议文件

November 2023 Pub Date : 2023-11-13 DOI: 10.47836/mjmhs.19.6.42

A. Saidu, Khuan Lee, Iskasymar Ismail, A. Oyedunni, Poh Ying Lim

{"title":"Effectiveness of Self-directed Virtual Learning on Retention of Cardiopulmonary Resuscitation Knowledge and Skills among Hospital Nurses in North-western Nigeria: Protocol Paper","authors":"A. Saidu, Khuan Lee, Iskasymar Ismail, A. Oyedunni, Poh Ying Lim","doi":"10.47836/mjmhs.19.6.42","DOIUrl":"https://doi.org/10.47836/mjmhs.19.6.42","url":null,"abstract":"Introduction: The instructor-led CPR training method has been used for over 4 decades. However, nurses’ knowledge and skills are still low. Instructor-led CPR training is an extremely capital-intensive programme that requires more time, workforce, and space, thus serving as an impediment to effective learning among the prospective nurses’ trainees. Self-directed training method is suggested to improve the knowledge and skills of CPR among healthcare practitioners due to the low cost and flexibility. This study aims to evaluate the effectiveness of self-directed method in improving nurses’ knowledge and skill retention from baseline to post-test, one, three-, and six months. Method: A two-arm double-blinded randomised controlled trial will be conducted in two referral hospitals. The control group training consists of a one-day session taught by AHA-certified instructors, whereas the intervention group training entails participants learning on computers in a simulation lab for seven days. A generalised estimated equation model will be used for statistical analysis. Discussion: Through the self-directed training method, participants will have significantly better knowledge and skills of CPR compared to the conversational training method across the time points. Self-directed training method is a simple, cost-effective and flexible method, which can facilitate the training of more nurses in the acquisition and retention of knowledge and skills, especially for those who prefer to learn at their own pace. Trial Registration: Registration Code: UDUTH/NHREC/30/012/2019 and NHREC/28/01/2020/AKTH/EC/2934","PeriodicalId":506570,"journal":{"name":"November 2023","volume":"14 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139278048","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

Characteristics of Paediatric Death Cases at a Malaysian University Hospital 马来西亚大学医院儿科死亡病例的特征

November 2023 Pub Date : 2023-11-13 DOI: 10.47836/mjmhs.19.6.27

Nur Amirah Saulius, Nor Rosidah Ibrahim, M. I. Ilias, Fahisham Taib

{"title":"Characteristics of Paediatric Death Cases at a Malaysian University Hospital","authors":"Nur Amirah Saulius, Nor Rosidah Ibrahim, M. I. Ilias, Fahisham Taib","doi":"10.47836/mjmhs.19.6.27","DOIUrl":"https://doi.org/10.47836/mjmhs.19.6.27","url":null,"abstract":"Introduction: Auditing of paediatric deaths has rarely been evaluated in hospitals especially in low and middle-income countries. The aim of the study is to describe the characteristics of paediatric death in hospitalised children and determine the predictors of death location in Hospital Universiti Sains Malaysia (USM). Method: Paediatric mortality cases for children aged between 29 days and 18 years old at the time of death were analyzed. These were documented cases between the year 2013 and 2020 at Hospital USM. Case notes were reviewed, and data were captured retrospectively. Multiple Logistic Regression was used to assess predictors of the location of death especially in the ward setting.Results: Out of 841 paediatric deaths identified during the period of the study, 544 cases were enrolled. The male gender has a higher proportion (1.4:1). The median age was 56 months, with infancy being the predominant age group. The median length of hospital stay was 10.5 days. More than half of the cases (58.3%) had underlying life-limiting illnesses. The majority of the patients had “Do Not Resuscitate” orders. A longer length of stay (prevalence odds ratio (POR 0.99, 95% CI 0.98, 0.99), being on ventilator (POR 3.42,95% CI 1.95, 6.01), being terminally ill (POR 0.40,95% CI 0.23, 0.70) and having underlying life limiting illness (POR 0.50, 95% CI 0.33, 0.75) were the significant predictors for the ward death. Conclusion: Understanding the characteristics of child death and the factors associated with death location is critical for improving paediatric care and treatment.","PeriodicalId":506570,"journal":{"name":"November 2023","volume":"31 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139278182","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

Oral Health Beliefs, Perceptions and Utilisation of Oral Health Care Services among the Indigenous People (Orang Asli) in Pahang, Malaysia: A Qualitative Study 马来西亚彭亨州原住民（Orang Asli）的口腔健康信念、观念和口腔保健服务利用情况：定性研究

November 2023 Pub Date : 2023-11-13 DOI: 10.47836/mjmhs.19.6.4

Izzati Mohd Khairunjauhari, Nor Faezah Md Bohari, Nawwal Alwani Mohd Radzi, Ilham Wan Mokhtar

{"title":"Oral Health Beliefs, Perceptions and Utilisation of Oral Health Care Services among the Indigenous People (Orang Asli) in Pahang, Malaysia: A Qualitative Study","authors":"Izzati Mohd Khairunjauhari, Nor Faezah Md Bohari, Nawwal Alwani Mohd Radzi, Ilham Wan Mokhtar","doi":"10.47836/mjmhs.19.6.4","DOIUrl":"https://doi.org/10.47836/mjmhs.19.6.4","url":null,"abstract":"Introduction: Orang Asli refers to the indigenous people of Peninsular Malaysia, representing 0.6% of the Malaysian population. Vast inequality was observed regarding oral health beliefs, behaviour, and utilisation of oral health services between the Orang Asli and non-Orang Asli. The aim of the study was to explore the oral health beliefs, perceptions, and oral health service utilization behaviour among Orang Asli in the district of Bera, Pahang, Malaysia. Methods: Orang Asli’s oral health beliefs and perceptions of oral healthcare service were ascertained through four FGDs. Nineteen participants from Bera’s semi-urban and rural Orang Asli communities were convened. Emerging themes from the qualitative data were analyzed using thematic analysis. Results: Orang Asli believed that oral health is essential for an individual’s function and aesthetics. They are also aware that inadequate oral hygiene care will result in tooth decay and gum disease. Most of the Orang Asli that chewed betel nuts believed that limestone paste could cause oral cancer. The main barriers to Orang Asli accessing oral healthcare services were time constraints and distance to the nearby clinic. Conclusion: The Orang Asli believed oral health care is essential in ensuring a healthy oral condition. Despite their generational belief towards traditional healers and medication, Orang Asli in Bera had a perceived positive acceptance towards oral healthcare services.","PeriodicalId":506570,"journal":{"name":"November 2023","volume":"73 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139278198","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