scholarly journals The effect of the virgin fibers to the properties of different paper products

2020 ◽  
Author(s):  
Tibor Czene ◽  
◽  
László Koltai ◽  
Keyword(s):  
Raw Materials ◽  
Low Cost ◽  
Point Of View ◽  
Chemical Additives ◽  
Long Distance ◽  
Recycled Paper ◽  
Paper Properties ◽  
Economic Point ◽  
Process Modification ◽  
Recycled Fiber

The products from paper are widely used materials with several benefits. The corrugated paper keeps items protected through long-distance logistic processes and constant shipping and handling. The corrugated boxboards are ideal options for any industry’s shipping, packaging and storage needs. Papers and cardboards are quite low cost and also provide environmental-friendly solutions, using recyclable materials such as used corrugated cartons and old newspapers. Recycling offers a reduction in environmental impact in densely populated regions and a large production of paper and board products. Generally, the use of recycled fiber produces paper with poorer mechanical properties due to the decrease in the interfiber bonding. The recycled pulp must be treated to restore its bonding strength, for which there are six methods possible: mechanical treatment, chemical additives, chemical treatment, fractionation, papermaking process modification and blending with virgin fiber. Although some mills produce 100% recycled paper, the majority augment their used pulp with some virgin fiber. Paper properties can be tailored within some ranges by modifying the properties of fibers, but the influence of fine quality on structure, strength and optical properties of paper can be even greater. The properties of papers are essentially determined by their raw materials. Most of these raw materials are made from 100% recycled fiber, but as the quality of the waste fiber varies, different chemicals must be used to provide the desired or expected properties. From an environmental and economic point of view, the use of primary fibers can be an alternative.

Mechanical Properties of Paper Thermosetting Resin Composites by Various Paper Materials

2014 ◽  
Author(s):  
Takanori Kitamura ◽  
Qianjin Zhang ◽  
Kanta Ito ◽  
Suguru Teramura ◽  
Zhiyuan Zhang ◽  
...  
Keyword(s):  
Raw Materials ◽  
Low Cost ◽  
Rolling Direction ◽  
Thermosetting Resin ◽  
Paper Recycling ◽  
Recycled Paper ◽  
Plastic Composite ◽  
Reinforced Plastic ◽  
Fracture Area ◽  
Wood Consumption

Recycling and reusing is a noticeable method for environment protecting. Recycled paper is one of the most successful cases as it contributes to energy saving, low cost, low wood consumption and environmental protection. During paper recycling process, many different kinds of raw materials can be used. Paperboards made of different raw materials showed different properties. In this study, three kinds of raw materials were selected to fabricate paperboards respectively combining with thermosetting resin, paperboards reinforced plastic composite was laminated by hand layup method. Detailed observation were carried out to analysis the molding stations including the tensile property which was investigated on both unnotched and notched specimens, besides, to investigate the anisotropy, tensile test was conducted on the specimens both in machine rolling direction and transverse direction. SEM was also employed to observe the materials and fracture area respectively.

Development of High Strength Material and Pipe Production Technology for Grade X120 Line Pipe

2004 ◽  
Author(s):  
Hans-Georg Hillenbrand ◽  
Andreas Liessem ◽  
Karin Biermann ◽  
Carl Justus Heckmann ◽  
Volker Schwinn
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Point Of View ◽  
Accelerated Cooling ◽  
Pipe Production ◽  
Production Test ◽  
Low Carbon ◽  
Long Distance ◽  
Line Pipe ◽  
Economic Point

The increasing demand for natural gas will further influence the type of its transportation in the future, both from the strategic and economic point of view. Long-distance pipelines are a safe and economic means to transport the gas from production sites to end users. High-strength steels in grade X80 are nowadays state of the art. Grade X100 was recently developed but not yet utilised. The present-day technical limitations on the production of X120 line pipe namely the steel composition, the pipe forming and the welding are addressed in this paper. Production test results on X120 pipes are presented to describe the materials properties. A low carbon and low PCM steel with VNbTiB microalloying concept is used. In the plate rolling the main attention is turned to the heavy accelerated cooling. The large spring back that occurs during the U-forming step of the UOE process is one of the most complex aspects in forming X120. To handle this aspect FEM calculations were used to modify the forming parameters and to optimise the shape of the U-press tool. For optimising the existing welding procedure with respect to an avoidance of HAZ softening, a low heat input welding technology and new welding consumables were developed.

scholarly journals SIMULATION MODEL OF THE PROCESS OF BIOGAS PRODUCTION FROM MULTICOMPONENT PLANT RAW MATERIALS. ANALYSIS AND PARAMETRIC OPTIMIZATION

2017 ◽  
pp. 171-184 ◽  
Author(s):  
Александр (Aleksandr) Григорьевич (Grigor'evich) Топаж (Topazh) ◽  
Владимир (Vladimir) Александрович (Aleksandrovich) Вигонт (Vigont) ◽  
Любовь (Ljubov') Анатольевна (Anatol'evna) Хворова (Hvorova)
Keyword(s):  
Technological Process ◽  
Complex Analysis ◽  
Biogas Production ◽  
Raw Materials ◽  
Operation Mode ◽  
Point Of View ◽  
Production Cycle ◽  
Economic Point ◽  
Optimal Values ◽  
Vegetable Raw Materials

Article is devoted to the description and the analysis of the system-dynamic model of technological process of biogas production from multicomponent vegetable raw materials. A research objective – optimization of biogas production process from vegetable raw materials by methods of imitating modeling, finding of the optimal regimes of the simulated production cycle – the best ratio from the economic point of view between an exit of biomethane and rates of giving/replacement of the initial substratum depending on the composition of raw materials.In article models with a discrete and continuous cycle of production are considered, the description of the similar realization executed in the environment of multiapproach modeling of AnyLogic for model of technological process of anaerobic digestion of non-uniform multicomponent vegetable biomass is provided.The known stoichiometric model of production of biomethane is taken as a basis, her modification is made for a case of multicomponent raw materials (percentage division into conditional components – sugar, lignin and cellulose). Possibilities of modern software shells and environments of modeling in tasks of the complex analysis and optimization of the studied process are shown.During the conducted researches a row of non-trivial results on a choice of optimum parameters of an operation mode of the model bioreactor is received. For a case of the discrete process of up-dating of contents as parameters of optimization the frequency and a level of up-dating, and for the continuous flowing system – channel speed were selected.It is shown that the optimal values of the parameters from the point of view of the integrated output of the biomethane lie close to the cloud of critical acidification, which leads to the stoppage of the process. If the economic indicators are chosen as an optimization criterion, then we obtain optimal values of the parameters lying within the region of stable functioning of the model bioreactor.

scholarly journals Economic Evaluation and Techno-Economic Sensitivity Analysis of a Mass Integrated Shrimp Biorefinery in North Colombia

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2397
Author(s):  
Antonio Zuorro ◽  
Kariana Andrea Moreno-Sader ◽  
Ángel Darío González-Delgado
Keyword(s):  
Sensitivity Analysis ◽  
Economic Evaluation ◽  
Net Present Value ◽  
Raw Materials ◽  
Integrated Approach ◽  
Economic Feasibility ◽  
Point Of View ◽  
Economic Point ◽  
The North ◽  
Water Pinch

The high freshwater consumption requirements in shrimp biorefinery approaches represents one of the major drawbacks of implementing these technologies within the shrimp processing industry. This also affects the costs associated with the plant operation, and consequently, the overall economic performance of the project. The application of mass integration tools such as water pinch analysis can reduce frewshwater consumption by up to 80%, contributing to shrimp biorefinery sustainability. In this work, the economic evaluation and the techno-economic sensitivity analysis for a mass integrated approach for shrimp biorefinery were performed to determine the economic feasibility of the project when located in the North-Colombia region and to identify the critical techno-economic variables affecting the profitability of the process. The integrated approach designed to process 4113.09 tons of fresh shrimp in Colombia reaches a return on investment (%ROI) at 65.88% and a net present value (NPV) at 10.40 MM USD. The process supports decreases of up to 28% in capacity of production and increases of 12% and 11% in the cost of raw materials and variable operating costs without incurring losses, respectively. These findings suggest that the proposed design of the water recycling network coupled to a shrimp biorefinery approach is attractive from an economic point of view.

scholarly journals Properties of Foamed Lightweight High-Performance Phosphogypsum-Based Ternary System Binder

2020 ◽  
Vol 10 (18) ◽  
pp. 6222 ◽  
Author(s):  
Girts Bumanis ◽  
Jelizaveta Zorica ◽  
Diana Bajare
Keyword(s):  
Ternary System ◽  
High Performance ◽  
Raw Materials ◽  
Low Cost ◽  
Construction Materials ◽  
Mineralogical Composition ◽  
Point Of View ◽  
Raw Material ◽  
Total Energy Consumption ◽  
And Performance

The potential of phosphogypsum (PG) as secondary raw material in construction industry is high if compared to other raw materials from the point of view of availability, total energy consumption, and CO2 emissions created during material processing. This work investigates a green hydraulic ternary system binder based on waste phosphogypsum (PG) for the development of sustainable high-performance construction materials. Moreover, a simple, reproducible, and low-cost manufacture is followed by reaching PG utilization up to 50 wt.% of the binder. Commercial gypsum plaster was used for comparison. High-performance binder was obtained and on a basis of it foamed lightweight material was developed. Low water-binder ratio mixture compositions were prepared. Binder paste, mortar, and foamed binder were used for sample preparation. Chemical, mineralogical composition and performance of the binder were evaluated. Results indicate that the used waste may be successfully employed to produce high-performance binder pastes and even mortars with a compression strength up to 90 MPa. With the use of foaming agent, lightweight (370–700 kg/m3) foam concrete was produced with a thermal conductivity from 0.086 to 0.153 W/mK. Water tightness (softening coefficient) of such foamed material was 0.5–0.64. Proposed approach represents a viable solution to reduce the environmental footprint associated with waste disposal.

УСОВЕРШЕНСТВОВАННАЯ ТЕХНОЛОГИЯ РЕМОНТА ЭЛЕКТРОГИДРАВЛИЧЕСКИХ ФОРСУНОК АВТОТРАКТОРНЫХ ДИЗЕЛЕЙ

2020 ◽  
Vol 4 (141) ◽  
pp. 74-82
Author(s):  
SERGEY TIMOKHIN ◽  
◽  
PAVEL BOGATYREV ◽  
DMITRIY GALIN ◽  
Keyword(s):  
Contact Surface ◽  
Diesel Engines ◽  
Low Cost ◽  
Ball Valve ◽  
Point Of View ◽  
Research Purpose ◽  
Process Time ◽  
Valve Seat ◽  
Economic Point ◽  
Ring Shape

The actual service life of electrohydraulic injectors of automotive diesel engines with a high-pressure battery system of the Common Rail type in operation is significantly lower than the claimed one, and its restoration by repair is relevant from a technical and economic point of view. One of the most wearable elements of electrohydraulic injectors is the contact surface of the ball valve seat. (Research purpose) The research purpose is in developing an improved technology for repairing electro-hydraulic injectors of automotive diesel engines with a vibration-rivet of the contact surface of the ball valve seat. (Materials and methods) The article presents the carried out theoretical substantiation of the process of vibration riveting of the ball valve seat of electrohydraulic injectors and its laboratory and bench studies using serial stands for testing electrohydraulic injectors, checking their elements and restoring the seat geometry by lapping, an electronic digital microscope. (Results and discussion) Authors confirmed the working hypothesis about the possibility of forming the ring contact surface of the ball valve of electrohydraulic injectors reinforced with a vibration riveting by creating certain hydraulic and electrical modes of its operation during the required time. For the model 0445110376 electrohydraulic injectors of the Cummins ISF 2.8 diesel engine, the total area of the hardened surface of the regular ring shape was 0.07 square millimeters, and the depth was about 0.003 millimeters with a process time of 45 minutes. The parameters of the experimental electrohydraulic injectors met the requirements of the test plan, and they are currently successfully undergoing operational tests. (Conclusions) The use of a valve seat vibration rivet will increase the life of repaired injectors at a low cost for its implementation.

scholarly journals TECHNOLOGICAL ASPECTS OF PRODUCTION AND RESEARCH OF POLYMERS COMPOSITE MATERIALS WITH INCREASED STRENGTH

2017 ◽  
Vol 60 (10) ◽  
pp. 82
Author(s):  
Rena E. Mustafaeva
Keyword(s):  
Composite Materials ◽  
Elevated Temperatures ◽  
Raw Materials ◽  
Low Cost ◽  
Point Of View ◽  
Atactic Polypropylene ◽  
Rubber Compounds ◽  
Increased Strength ◽  
Tearing Resistance ◽  
Constant Deformation

The work is devoted to the search for new effective modifying additives that allow to purposefully regulate the technological properties of rubber compounds and physical-mechanical properties of rubbers based on combinations of non-polar rubbers and at the same time being cheaper and more affordable than traditional products, in particular, with resorcinol-urotropin complex (modifier RU -1). It was proposed to use as a modifier of frame rubbers based on a combination of isoprene (SKI-3) and butadiene-styrene (SCS-30ARKM-15) rubbers, chlorinated atactic polypropylene (CHAPP). It is shown that when the RU-1 modifier is replaced with this compound, the conditional stresses and tensile strength, tearing resistance, rebound elasticity, fatigue resistance in the regime of constant deformation amplitude, heat resistance, resistance to thermal aging of rubbers, as well as the strength of rubber bonding with rubber Textile cord, including at elevated temperatures are observed. Comparison of the CHAPP for the effectiveness of the action in the carcass gum with the previously proposed oligoefirmetacrylate epichlorhydrine, from the point of view of the provided complex of properties, showed the advantage of chlorinated atactic polypropylene for a number of priority indicators. From the comparative analysis of the modifying activity of chlorinated atactic polypropylene and oligoether methacrylate epichlorohydrin, it follows that the vulcanizates of rubber compounds containing instead of RU-1 chlorinated atactic polypropylene CHAPP are characterized by more improved parameters of hardness in TM-2, elasticity by rebound, the strength of the rubber-cord connection. It is also revealed that the main advantage of the proposed modifier is the low cost of the modifier used, as well as the use of secondary raw materials for its production.Forcitation:Mustafayeva R.E. Technological aspects of production and research of polymers composite materials with increased strength. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 10. P. 82-86

scholarly journals Resíduos de equipamentos eletroeletrônicos: riscos e oportunidades

2020 ◽  
Vol 13 (2) ◽  
pp. 296-312
Author(s):  
Jaqueline Terezinha Martins Corrêa Rodrigues ◽  
Liane Werner ◽  
Márcia Dutra de Barcellos
Keyword(s):  
Reverse Logistics ◽  
Raw Materials ◽  
Point Of View ◽  
Planned Obsolescence ◽  
Public And Private ◽  
Economic Point ◽  
Renewable Raw Materials ◽  
Use Of Technology ◽  
The Social ◽  
Points Of View

It is estimated that the amount of waste electrical and electronic equipment (WEEE) increases annually due to planned obsolescence, technological changes and changes in people's lifestyles. The aim of the present study is to identify risks and opportunities related to WEEE from an environmental, social and economic point of view, considering the intensified use of technology, the generation and the need to treat this waste. The study consisted of a bibliographic research followed by three case studies with waste disposal companies. Therefore, a table was drawn up outlining the risks and opportunities of WEEE, considering different points of view. From the environmental point of view, there is a risk of increasing the consumption of this equipment to increase the illegal and incorrect disposal, but the extraction of non-renewable raw materials can be reduced by implementing reverse logistics. From the economic perspective, the costs involved in the reverse logistics of WEEE are not clearly known; however, there is an expanding market for WEEE management. From the social point of view, the risk is the increase of informal and insecure work, which can be minimized through investments from public and private powers, thus generating formal jobs.

scholarly journals The Case of Ryanair - EU State Aid Policy on the Wrong Runway

ORDO ◽  
2004 ◽  
Vol 55 (1) ◽  
Author(s):  
Friedrich Gröteke ◽  
Wolfgang Kerber
Keyword(s):  
Low Cost ◽  
Public Funding ◽  
State Aid ◽  
Point Of View ◽  
Economic Point ◽  
The Public ◽  
Effective Competition ◽  
Price Differentiation ◽  
Regional Airports ◽  
Aid Policy

SummaryFor the European Commission the case of Ryanair is a precedence decision about the application of state aid policy to agreements between regional airports and airlines. In a long-term contract with the regional airport of Charleroi (near by Brussels), the Irish low-cost airline Ryanair received better conditions than other airlines. In return, it committed itself to transport a certain number of passengers to this airport for a period of fifteen years. This alleviates considerably the entry of the so far non-established Charleroi Airport into the market for international airports. The Commission interprets these better conditions as a discrimination, which distorts competition among airlines. Contrary to that, a thorough economic analysis shows that these conditions must be regarded as a normal form of price differentiation in effective competition. Any airlines would have received similar conditions, if they have offered similar advantages to the airport. Consequently, the decision of the Commission in the Ryanair case is wrong. Additionally, the principles of the Commission, which entail the danger of an allencompassing regulation of prices for airport services, are misleading from an economic point of view, because they tend to impede effective competition in the aviation sector. The real state aid problem is, however, whether and under what conditions the public funding of airports leads to a distortion of competition among airports. This problem remains unsolved. This is also true for the problem of the slot-allocation on airports.

Extension of Current Defect Assessment Methods for Gouge and Corrosion Defects in X80 Grade Pipeline

2012 ◽  
Author(s):  
Giuliano Malatesta ◽  
Andrea Meleddu ◽  
Robert Owen ◽  
Mures Zarea
Keyword(s):  
High Strength ◽  
Experimental Tests ◽  
Point Of View ◽  
Long Distance ◽  
Economic Point ◽  
Steel Pipes ◽  
Defect Assessment ◽  
Sound Theory ◽  
Need To Evaluate ◽  
Increasing Demand

The increasing demand for natural gas affects the type of transportation, both from the strategic and the economic point of view. Long-distance pipelines are a safe and economic way to transport the gas from production sites to end users. Hence, pipes producers need to supply the market executing projects where high strength material is involved, to reduce the steel use. Among high strength steel grade pipes (X80 - X100 - X120), the X80 grade is already in use for a number of gas pipelines in the world since many years. There is a need to evaluate the suitability of extending the current Fitness For Purpose methods to X80 grade steel linepipe, since the existing guidance was developed and validated mainly on test data coming from steel pipes of grade lower than X80. Hence they could not be directly applied to X80 grade pipes, but should be experimentally verified, otherwise their straightforward extrapolation would be questionable. EPRG recognized the need to cover this gap and launched a specific project, aimed at verifying the applicability of the presently available criteria to X80 grade, with particular focus on corrosion and gouge types of defects, longitudinally oriented. The project includes the collection and review of available tests data and FFP criteria, and the identification of the most promising among those collected. Four hydraulic full scale burst tests on X80 representative pipes (helically and longitudinally welded) containing simulated corrosion and gouge defects have been carried out to experimentally verify the applicability of the criteria to the X80 grade pipes. The selected criteria for the corrosion (DNV RP-F101) and for the gouge (Battelle NG-18) defects revealed to be suitable for X80 grade pipes too, as demonstrated by the accuracy in predicting the failure pressure of the experimental tests and of the literature database. The criteria showed to be even more accurate for X80 grade than they were for lower grades. Finally, it is worth mentioning that the selected criteria did not need any correction factor for obtaining the best prediction. Such a result is a demonstration of the sound theory behind the criteria.

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