Crepe Paper Research Articles

Sifat Organoleptik Madumongso Tape Ubi Ungu dengan Perbedaan Proporsi Tape Ketan Hitam dan Tape Ketan Putih

Madumongso in this research is a processed product made from purple sweet potato tape, black sticky rice tape, and white sticky rice tape which is processed by mixing supporting ingredients such as sugar, coconut milk and pandan using low heat. Round shape wrapped in plastic and crepe paper. Optimal organoleptic characteristics can increase consumer acceptance and the combination of these ingredients can increase the nutritional content of the product. The aim of this product is 1) to determine the organoleptic properties which include shape, color, taste, texture, 2) to determine the nutritional content of madumongso purple sweet potato tape with the difference in proportions of black sticky rice tape and white sticky rice tape. This type of research is experimental. The data collection technique used was observation through 5 training panelists and 25 semi-practice panelists who were assisted with assessment observation sheets 1-5. The independent variables in this research are purple sweet potato tape, black sticky rice tape and white sticky rice tape, the dependent variables in this research are shape, color, taste and texture, and the control variables in this research are the type of equipment, raw materials and manufacturing techniques. Data analysis in this study used one-way ANOVA. The results of this research show 1) there is no influence on color and texture, 2) there is an influence on shape, taste and level of liking for the purple sweet potato madumongso tape product.

Fabrication of highly stretchable composite organohydrogel for strain sensors with high sensitivity and broad temperature tolerance

Elastically stretchable conductive hydrogels have garnered significant scholarly interest for their potential applications in wearable sensing technologies. Yet, these highly elastic hydrogels often display diminished sensory capacities, particularly under conditions of severe thermal variation. This investigation unveils a highly stretchable composite organohydrogel distinguished by its superior sensory proficiency and resilience to harsh thermal environments. Encapsulating carbonized crepe paper (CCP) within a hydrophobic association-driven organohydrogel-crafted through the micellar copolymerization of hydrophobic stearyl methacrylate with hydrophilic acrylamide, and incorporation of polyvinyl alcohol (PVA) and Al3+ in a binary solvent of glycerol and water-we attained a high stretchability of 3865 %, in conjunction with augmented tensile strength and sensory acuity. Moreover, this composite demonstrates a gauge factor of 263.1 for strains ranging from 400 to 550 %, a detection threshold of 0.1 %, swift response/recovery times (161/152 ms), and sustained durability over 1000 cycles at a 100 % strain. Such attributes facilitate its deployment in the realms of health monitoring, activity sensing, gesture recognition, and wireless motion control, even under extreme thermal conditions, heralding a pioneering strategy for the creation of cost-efficient, high-efficacy electronic conductive hydrogels.

Establishing a Corrugated Carbon Network with a Crack Structure in a Hydrogel for Improving Sensing Performance.

Electronic conductive hydrogels have prompted immense research interest as flexible sensing materials. However, establishing a continuous electronic conductive network within a hydrogel is still highly challenging. Herein, we develop a new strategy to establish a continuous corrugated carbon network within a hydrogel by embedding carbonized crepe paper into the hydrogel with its corrugations perpendicular to the stretching direction using a casting technique. The corrugated carbon network within the as-prepared composite hydrogel serves as a rigid conductive network to simultaneously improve the tensile strength and conductivity of the composite hydrogel. The composite hydrogel also generates a crack structure when it is stretched, enabling the composite hydrogel to show ultrahigh sensitivity (gauge factor = 59.7 and 114 at strain ranges of 0-60 and 60-100%, respectively). The composite hydrogel also shows an ultralow detection limit of 0.1%, an ultrafast response/recovery time of 75/95 ms, and good stability and durability (5000 cycles at 10% strain) when used as a resistive strain sensing material. Moreover, the good stretchability, adhesiveness, and self-healing ability of the hydrogel were also effectively retained after the corrugated carbon network was introduced into the hydrogel. Because of its outstanding sensing performance, the composite hydrogel has potential applications in sensing various human activities, including accurately recording subtle variations in wrist pulse waves and small-/large-scale complex human activities. Our work provides a new approach to develop economical, environmentally friendly, and reliable electronic conductive hydrogels with ultrahigh sensing performance for the future development of electronic skin and wearable devices.

Flower bagging affects seed quality and dormancy period in Na-Oogst tobacco (Nicotiana tabacum L. var H-382)

Seeds of tobacco plants are unable to germinate immediately after harvest because they have a dormancy period. The seed dormancy period may be shortened by bagging methods to affect the hormone content in the seeds. The bagging flower makes the dark conditions in the process of flowering and seed development, affecting the content of the hormone’s auxin and ABA. This study aimed to determine the effects of different bag colors on the dormancy period of tobacco seeds as evidenced by their vigor and viability. The research was conducted from March to August 2022 at PT. Dwi Light Tobacco Green House, Lombok Wetan, Bondowoso, Indonesia. Four crepe colors of paper were used as bagging treatments (black, red, yellow, blue) and control (without bagging) and replicated four times. The results showed that the bagging treatment significantly affected one hundred-seed weight, seed germination, seed growth rate, and seedling height. Black crepe paper resulted in the highest seed germination percentage (98.5%) and seed growth rate (11.68). 
 Keywords: bag color, seed germination, viability, vigor

Characteristics of 3D Printed Biopolymers for Applications in High-Voltage Electrical Insulation.

Three-dimensional printing technology is constantly developing and has a wide range of applications; one application is electrical insulation, where the standard technology uses polymer-based filaments. Thermosetting materials (epoxy resins, liquid silicone rubbers) are broadly used as electrical insulation in high-voltage products. In power transformers, however, the main solid insulation is based on cellulosic materials (pressboard, crepe paper, wood laminates). There are a vast variety of transformer insulation components that are produced using the wet pulp molding process. This is a labor-intensive, multi-stage process that requires long drying times. In this paper, a new material, microcellulose-doped polymer, and manufacturing concept for transformer insulation components are described. Our research focuses on bio-based polymeric materials with 3D printability functionalities. A number of material formulations were tested and benchmark products were printed. Extensive electrical measurements were performed to compare transformer components manufactured using the traditional process and 3D printed samples. The results are promising but indicate that further research is still required to improve printing quality.

An overview of eosinophilic esophagitis in children

Based on the patient's age, eosinophilic esophagitis (EE) has different clinical manifestations. Infants and young children frequently have vague manifestations such difficulty eating, nausea, and discomfort in the abdomen. Despite having symptoms that resemble gastroesophageal reflux, children with EE, do not respond to intensive ant reflux medication. Dysphagia and food impaction became the most common symptoms in adults and adolescents. EE should also be considered when treating adults and children who continue to have heartburn. Pediatric and adult patients frequently have concurrent allergy disorders such asthma, rhinitis, and eczema, in addition to peripheral eosinophilia and increased total blood IgE levels. Mucosal oedema, furrows, exudates, corrugated bands, strictures, and the alleged "crepe paper sign" are some of the endoscopic characteristics of EE. EE is widely seen as a distinct condition from reflux disorder. According to current understanding, the former could be a symptom of eosinophilic gastroenteritis or be induced by cell-mediated food hypersensitivity. Reports back up the effectiveness of steroid treatment or food restriction. To ascertain the cause, enable early clinical identification, and enhance treatment, more research is required.

APPLICATION OF METHODS FOR DETERMINATION OF THE VOLATILE CORROSION INHIBITORS CONTENT IN COMBINED PACKAGING MATERIALS

One of the modern means of corrosion protection of metal products during transportation and storage is packaging materials containing volatile corrosion inhibitors. The efficiency of the metal protection is highly dependent on their content in the packaging materials. Present study considers the peculiarities of practical application of Synchronous Thermal Analysis method and Walki Wisa (Finland) method for determination of the corrosion inhibitor content in packaging combinations. The packaging materials used in the study were the crepe paper laminated with thermoplastic polymer on one side, onto which the water solutions of inhibitors Koring 501, 505 (Cortec, USA) and UNI (a mixture of sodium nitrite and urotropine in relation 1:1, Russia) containing 5 % (mas.) of active substance were applied with a roller. After application of the solution the paper was subjected to drying at 80 °C for 35 min. The residual content of inhibitors was determined by two methods: thermogravimetric analysis using STA 449 F3 Jupiter and the method of washout according to the Walki Wisa method. It was shown that washout method requires preliminary isolation of inhibitor from packing material in the form of its aqueous extract. It was found that the inhibitor content indices obtained by the washout method have higher values compared to the initial samples which is probably caused by the water extraction of other components from combined material together with the inhibitor. The content of the inhibitor in the materials under study and the temperature of the maximum rate of inhibitor volatilization were determined by the thermogravimetric analysis. The sample with UNI inhibitor had the highest inhibitor content (13 %) and a higher maximum volatilization temperature compared to the other samples. This may be due to the overlapping processes of urotropin removal and cellulose fibers decomposition. The method of thermogravimetric analysis can be applied for determination of the inhibitors removing up to 200 °C. It is noted that both considered methods have certain limitations and can be used for approximate determination of the inhibitor content in paper-based composite packaging materials.

Electrifying lasers for the transformer industry

AbstractBR Technologies is enabling a transformer manufacturer to cut its insulation paper in a unique way by using lasers integrated into its machines. The SR 15i CO2 laser sources from Luxinar are cutting crepe paper, which is used as an insulation layer inside the electrical transformers that are sold to power grid suppliers.

Electrifying lasers for the transformer industry

PhotonicsViewsVolume 19, Issue 4 p. 50-51 Laser CuttingFree Access Electrifying lasers for the transformer industry How CO2 laser sources are being used for paper cutting First published: 01 September 2022 https://doi.org/10.1002/phvs.202270414AboutPDF ToolsExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract BR Technologies is enabling a transformer manufacturer to cut its insulation paper in a unique way by using lasers integrated into its machines. The SR 15i CO2 laser sources from Luxinar are cutting crepe paper, which is used as an insulation layer inside the electrical transformers that are sold to power grid suppliers. Volume19, Issue4August/September 2022Pages 50-51 RelatedInformation

Surface modification in the shape of a pattern using crepe paper maskant in EDM

ABSTRACT This article describes a new approach of surface modification in the shape of a pattern employing powder metallurgical (PM) green compact tool and electrical discharge machining (EDM). Patterns on the workpieces of aluminium (Al) 6061 are generated using PM green tools and crepe paper masking technique in EDM. The tool material is made of copper and tungsten powders. The pattern surface is analyzed by evaluating the output performance. The presence of electrode material in the pattern surface is identified, and the characteristics of the surface are significantly altered. The morphology and output properties of the treated material are studied, and the EDM process parameters are optimised. The deposition rate of material is found to be 15.53 mg/min where minimum roughness of 5.63 µm and minimum deviation of the edges of 15.64 µm are observed at compact load of 20 ton, peak current of 3A and pulse on-time of 200 µs.

Impact of the Use of Vegetable Oil on the Mechanical Failure of the Cellulosic Insulation of Continuously Transposed Conductors in Power Transformers

Natural esters have become of interest for the industry in recent years as dielectric liquids for power transformers, and many studies are focused on their dielectric and chemical properties and on their influence in the degradation of the solid insulation due to aging. However, very little is known about their impact on the evolution of the mechanical properties of the paper insulation, which are acknowledged to have a considerable influence in their overall performance and reliability during the operating life of power transformers. This work studies the effects of thermal aging with vegetable oil in some commercial components, which are commonly used in power transformers, such as an insulated continuously transposed conductor (CTC) and samples of thermally upgraded crepe insulation. The changes in the properties of the crepe paper insulation are characterized through the degree of polymerization and tensile testing. Failure initiation and propagation in the insulation of the CTC is analyzed macroscopically. The results are compared with those obtained when using mineral oil, showing that the use of vegetable oil has a protective effect over mechanical properties of the studied types of paper insulation.

Degradation characteristics of insulation near aluminium foil edges inside dry‐type bushing cores under electrothermal compound stress

Insulation breakdown of dry-type valve-side bushing cores under electrothermal compound stress has become a key factor limiting the safe and stable operation of the converter transformer. Based on slices of the real bushing core, it is observed for the first time that fold, peeling off, and fracture defects exist near the aluminium (Al) foil edge, accompanied by many metal spikes with a curvature radius <4 μm. Coupled with a capacitor screen thickness of ∼2 mm, an electrical tree model is designed to simulate insulation defects near aluminium foil edges inside dry-type bushing cores, whose insulation degradation characteristics under electrothermal compound stress are investigated accordingly. The results show that high temperature significantly increases the dielectric loss heat energy density and Joule heat energy density, accelerating the insulation degradation near Al foil edges. The parallel crepe paper interface significantly accelerates the growth of electrical trees under AC-superimposed positive DC voltage, while this effect is not significant under AC voltage. As the crepe paper consists of wooden fibres of 10 μm diameter, the electrical trees tend to grow along interfaces between fibres and epoxy resin to form “feathery” electrical trees in epoxy resin-impregnated paper samples.

Study of operating properties of aanticorrosion packing papers

Metal products are subjected to atmospheric corrosion during transportation and storing. An important way to prevent this negative phenomenon is application of special packing materials, in particular materials, containing volatile inhibitors of corrosion, which protect metal against various corrosion agents. To protect metal effectively it is necessary to provide a definite level of operating characteristics of packing materials. The purpose of the work was the study of operating properties of inhibited crepe, inhibited and laminated polyethylene film, inhibited crepe and reinforced by polypropylene web papers, manufactured by OJSC “PP TechnoKhim”, Magnitogorsk, used for packing of metals. Structural and dimensional, sorption, deformation and strength characteristics, of the studied anticorrosion papers are presented, the characteristics being calculated based on the results of measurements. To determine their physical-mechanical and anticorrosion properties, standard methods and methodologies were used. To evaluate impact of moisture and transportation conditions, indices of water adsorption and wear of the studied papers were determined. Inhibitor content in these materials was determined by thermogravimetric analysis method. Their protective ability was studied on samples of low carbon steel strip. For accelerated corrosion tests the strip samples were degreased by alcohol, dried in air and packed in the studied anticorrosion papers, after that they were exposed under increased temperatures and moisture conditions. It was determined, that among the materials under the study, the inhibited crepe paper, reinforced by polypropylene web, hhas the best complex of physical-mechanical and anticorrosion properties. It provides a higher level of prevention corrosion of metal l and surpasses other materials in a number of deformation and strength characteristics. Recommendations were proposed to improve qquality of produced anticorrosion papers.

En Tokio. El testimonio sobre Japón de un diplomático mexicano en un chirimen-bon del siglo XIX

Artículo que presenta un texto prácticamente inédito de literatura de viaje, En Tokio, escrito en 1899 por el mexicano Ramón G. Pacheco –tercer secretario de la representación mexicana en Japón de 1899 a 1901, además de enviado extraordinario y ministro plenipotenciario de México en ese país de 1907 a 1913–, y contiene sus impresiones personales sobre el Japón de finales del siglo XIX. Este texto tiene doble interés: refleja las percepciones de un diplomático que años después de haber escrito el libro habría de convertirse en elemento clave de las negociaciones comerciales ante Japón, como embajador plenipotenciario de nuestro país; por otro lado, la obra de Pacheco es una rareza bibliográfica impresa en Japón en un tipo de papel crepé y con una encuadernación tradicional que lo hace quizá uno de los primeros textos de su tipo impreso por un mexicano en Japón.

An innovative approach for resin infusion and impregnation processes of a commercial resin-impregnated paper bushing

In the present analysis, a new experimental pilot plant system for exploring resin-impregnated paper (RIP) bushing technology was conducted. Experimental and numerical studies were carried out on the resin infusion and impregnation processes in the paper condenser core of a RIP bushing. An innovative approach for the molding process (named molding method B) of a commercial RIP bushing was implemented. For this method, the homogeneity of the paper winding process was controlled precisely. The filling process was conducted by gravity due to the difference of heights between two vacuumed chambers and from bottom to top in the mold. The flow front position and infusion time were measured experimentally and used to obtain the axial permeability of the paper condenser core analytically and numerically. The results indicate that the molding methods have a significant effect on the RIP bushing quality, homogeneous filling, and impregnating process time. Also, it was found that homogeneity of the paper winding process and, consequently, uniform axial velocity of resin flow in the radial direction is the most effective factor to eject the air. Finally, it was recognized that the determination of axial permeability in the case of transient flow is novel in comparison with conventional procedures such as Darcy relation of steady flows. By decreasing the paper thickness from 0.3 to 0.2 mm, the permeability decreased from 8.84 × 10−10 to 4.52 × 10−10 m2. The microstructure of the core illustrates that the axial permeability of the crepe paper condenser core is considerably affected by the variation of the paper thickness.

Comparative Analysis of Glass Fiber Sheet and Crepe Paper for a Wick Type Floating Solar Still

Water is a prerequisite for the existence of life on earth. Rapid growth in the global population and industrialization have created a dearth of freshwater resources. Escalating water scarcity suggests that the use of passive solar stills is the most suitable and viable option in the arid and semi-arid areas around the world. In this study, the yield of wick type floating solar still is experimentally investigated for different wick materials. Capillary rise and absorbency of two different absorbers are considered as performance parameters for analysis of the research. Based on results, crepe paper with absorbency (1.8s) and capillary rise (112mm/h) proved a better absorber for higher productivity of the still. The efficiency of still with crepe paper was observed to be 16.68% higher than that of glass fiber sheet when applied in still during the investigation. The maximum internal temperature and the productivity of still were 9.1°C and 0.8 L/day respectively higher when crepe paper was used instead of a glass fiber sheet as a wicking material.

Dielectric response and space charge in epoxy impregnated paper composite laminates

As the main material of the converter transformer dry-type bushing, the dielectric properties of epoxy/crepe paper at different temperatures and frequencies are related to the electric field and thermal field distribution of the bushing, which directly affects the safe and stable operation of the bushing. Here we report the dielectric response of samples of dry-type bushing insulation measured at a range of temperatures appropriate to operation and down to frequencies below those usually used. A significant loss peak observed below power frequency is interpreted as originating from the charging of internal epoxy resin interfaces by the transport of charge carriers on structured paths in the epoxy-impregnated crepe paper layers. A simulation model is proposed that allows estimation of the space charge and field distribution at any given frequency.

Space charge dynamics in epoxy resin impregnated crepe paper multilayer under voltage polarity reversal

In this paper, the temporal space charge dynamics under both temperature and voltage polarity reversal of an epoxy resin impregnated crepe paper are characterized by pulsed electroacoustic method. It is found that the space charge injection and the interfacial traps located between the epoxy and paper plays an important role in determining the space charge dynamics. The results reveal that below 353 K, the calculated interfacial charge density is consistent with the Maxwell-Wagner (MW) model, while above 353 K, it is smaller than the measured value. The time constant during charging is much smaller than that predicted by the MW model and the space charge injection showed polarity effect, which leads to the interfacial charge densities under polarity poling voltage not being equal. It is proposed that the interfacial traps and space charge injection should be responsible for the observed space charge dynamics.

An Uncommon Cause of Dysphagia

Dysphagia is a common indication for a referral to a gastroenterologist and is evaluated in 10 million Americans yearly. Etiologies of dysphagia include gastroesophageal reflux disease, eosinophilic esophagitis (EoE) and structural causes such as stricture, web, or tumor. In most cases, proton pump inhibitor (PPI) resolve dysphagia but immune mediated causes may require other therapies. We present an unusual cause of dysphagia that was not responsive to PPI therapy. A 37-year-old woman with a history of Sjogren's disease and autoimmune hepatitis presented for evaluation of dysphagia to solid food for several years. Prior upper endoscopy (EGD) showed LA grade A esophagitis for which she was treated with PPI. She remained on this therapy for two years, however, her dysphagia persisted. She ultimately sought care in our clinic for PPI refractory dysphagia. Because of persistence of symptoms despite maximal dosing of PPI, an EGD was repeated. This showed circumferential esophagitis in the distal one third of the esophagus as well as an esophageal narrowing at 27cm from the incisors. The esophagus was friable and bled with contact of the endoscope. Because of crepe paper appearance of esophagus, there was high suspicion for EoE. However, the biopsies revealed squamous mucosa with prominent intraepithelial lymphocytes; no eosinophils were present. These findings were consistent with lymphocytic esophagitis (LE). LE is a rare entity detected in only 1/1000 esophageal biopsies yet has been more frequently diagnosed over the last decade. LE is characterized by an increase in the number of intraepithelial lymphocytes, but the exact count needed for the diagnosis remains unclear. LE presents usually with dysphagia, chest/abdominal pain, and pyrosis. LE occurs more frequently in women with immune-mediated disorders. Effective treatment for LE remains unknown but reported treatment options include those used for EoE including PPI, steroids, and esophageal dilation. We chose to treat this patient with topical fluticasone 440mcg twice daily. Initial trial was complicated by episode of candida esophagitis, but patient has resumed fluticasone while continuing PPI. We will plan repeat EGD to evaluate for endoscopic and histologic improvement with this therapy. In conclusion, LE should be considered as a potential cause of dysphagia and esophageal inflammation, especially in patients with underlying autoimmune disease. More data is needed to determine optimal treatment.1757_A Figure 1. Narrowing at 27 cm1757_B Figure 2. Esophagitis with exudates1757_C Figure 3. Esophagitis characterized by edema and friability STANDARD STUDY

Flexible and Highly Sensitive Resistive Pressure Sensor Based on Carbonized Crepe Paper with Corrugated Structure.

Recently, cellulose paper based materials have emerged for applications in wearable "green" electronics due to their earth abundance, low cost, light weight, flexibility, and sustainability. Herein, for the first time, we develop an almost all cellulose paper based pressure sensor through a facile, cost-effective, scalable, and environment-friendly approach. The screen-printed interdigital electrodes on the flat printing paper and the carbonized crepe paper (CCP) with good conductivity are integrated into a flexible pressure sensor as substrates and active materials, respectively. The porous and corrugated structure of the CCP endows the pressure sensor with high sensitivity (2.56-5.67 kPa-1 in the range of 0-2.53 kPa), wide workable pressure range (0-20 kPa), fast response time (<30 ms), low detection limit (∼0.9 Pa), and good durability (>3000 cycles). Additionally, we demonstrate the practical applications of the CCP pressure sensor in detection of finger touching, wrist pulse, respiration, phonation, acoustic vibration, etc., and real-time monitoring of spatial pressure distribution. The proposed CCP pressure sensor has great potentials in various applications as wearable electronics. Moreover, the subtle fabrication of the desired materials based on commercially available products provides new insights into the development of green electronics.