فهرست مطالب

صنعت لاستیک ایران - پیاپی 66 (تابستان 1391)

نشریه صنعت لاستیک ایران
پیاپی 66 (تابستان 1391)

  • بهای روی جلد: 40,000ريال
  • تاریخ انتشار: 1391/07/11
  • تعداد عناوین: 8
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  • A. Samadi, M. Razaghi, Kashani Page 5
    Tire rolling resistance plays an important role in fuel consumption of automobiles. The main source of tire rolling resistance is viscoelastic loss of rubber compounds. Tire tread compound is the main source of viscoelastic loss among others. The change in rolling resistance of a tire with a new tread compound can be measured after manufacturing of new tire, which is time and money consuming. To reduce cost and time, prediction of energy dissipation of tire tread vulcanizates in rolling conditions has been considered. There are many methods for calculation of tire rolling resistance and/or measurement of energy dissipation in the tread compound under rolling condition in the laboratory. This article explains different methods for prediction of tire rolling resistance and illustrates the strengths and weaknesses of those methods.
    Keywords: Rolling Resistance, Energy Dissipation, Tire Tread, Prediction
  • Page 14
    In this research, we have investigated the effects of addition of different percentages of nanoclay to the ethylene propylene diene monomer (EPDM) and nitrile butadiene rubber (NBR) on the characteristics of these rubbers as seal material. Properties such as tensile strength, modulus at different extensions, elongation at break, compression set, hardness, permeability and abrasion resistance are tested to assess the effect of addition of the nanoclay. Results indicate that addition of nanoclay at certain compositions could slightly reduce the strength of the rubber, however more stable modulus at different strains are provided, the hardness of the rubber is preserved and slightly enhanced, the permeability is reduced in both rubbers, especially considerable decrease in EPDM is observed, which is desirable in diminishing the effect of explosive decompression. At the same time, the compression test shows that the nanoclay improves the performance of the rubbers under compression, which is essential in seal application. The X-ray diffraction tests clarify that the dispersion of the nanoclay in the NBR samples is of high quality. In the EPDM samples, the dispersion is in need of improvement.
    Keywords: permeability, compression, Seal, Nanoclay, NBR, EPDM
  • Sh. Ezzoddin, A. Abbasian Page 31
    Highly aromatic petroleum oils which have been used widely as process oils in tire industry, contain high concentrations of Polycyclic Aromatic Hydrocarbons (PAHs). These compounds (PAHs) are proved to be carcinogenic and threaten the environment. Thus, the use of highly aromatic process oil in tire rubber compounds has been banned in Europe since 2010 and will be gradually globalized. Therefore, replacing these process oils with low aromatic ones has become a global challenge today. This study, has reviewed process oils as a whole, carcinogenicity of highly aromatic process oils used in tire industry and methods to determine the carcinogenicity of process oils. Also, different alternatives for highly aromatic process oils have been introduced taking a look at some published studies in this regard.
    Keywords: Rubber Process Oil, Highly Aromatic Oil, Low Aromatic Oil, Polycyclic Aromatic Hydrocarbon (PAH)
  • F. Motiee, F. Tadayon, Z. Karvandi, Mojarad Page 48
    In this study four relevant factors, temperature, time, humidity and storage atmosphere were selected and the effect of each factor on aging of unvulcanized NR compound were studied at three different levels, based on measuring the ozone resistant and fatigue life time of rubber blends to monitor the extent of degradation. The optimal combination of mentioned factors was determined based on Taguchi protocol, and maximum fatigue life was obtained. Taguchi experimental design reduces cost and improves quality. The result of this work can be useful for rubber industries who storage their final compounds more than one day in the production lines.
    Keywords: Natural rubber, Taguchi method, Aging, Fatigue life
  • A. Ebrahimi Page 55
    Increasingly, supply chain management is being recognized as the management of key business process across the network of organization that comprises the supply chain. While many have recognized the benefits of a process approach to managing the business and the supply chain, most are vague about what process are to be considered, what subprocess and activities are contained in each process, and how the process interacts with each other and with the traditional functional silos. In this paper, we provide strategic and operational description of each of the eight supply chain processes identified by members of the Global Supply Chain Forum. Our aim is to provide managers with material useful in structuring a supply chain management course, and researchers with a set of opportunities for further development of the field.
    Keywords: Supply chain, Process, Strategic, Operational
  • K. Shahanghi, M.R. Hamidi, E. Jahani Page 78
    5S system is a prerequisite concept for successful implementation for many improving techniques. Therefore it has an important role in organizational improvement. However, in theory, 5S system seems simple, but in practice, it is time consuming and complicated, because cooperation of all individuals in an organization is needed. In this paper, we try to introduce a model based on autonomous concept which synchronize employees and elements of an organization and converts the lack of cooperation threat to the oppurtunity of full cooperation.
    Keywords: 5S, Autonomous, Organizational culture, Organizational Trainings
  • Page 87
    Around the world, people are suffering the continuous increase in hydrocarbon fuel prices and are astonishingly following the fuel crisis. Due to this matter, there are initiatives to replace diesel fuel and gasoline with new alternatives which their resources are renewable and environmentally friendly. Daily increase in fuel consumption and the adoption of stringent emission norms, are motivated some researchers to find new alternative fuels for internal combustion engine. Many substituted fuels like Alcohol, Biodiesel, LPG, CNG have been already commercialized in the transport sector. Recently, the oil from pyrolysis of scrap tires has been interested to some engineers as fuel oil. With respect to production of 1.5 billions of scrap tires worldwide, and the fact that 50- percent of them are not possible to be properly recycled, and are inevitably accumulated in the environment have been forced researches to find alternative fuels from scrap tires. Following the inventions of tire pyrolysis processes under vacuum and also flow of nitrogen gas and production of tire pyrolysis oil (TPO), some initiatives for its utilization as fuel for diesel engine has been commenced. First, a researcher in 2008 used TPO as fuel in an internal combustion engine. He tried to compare the motor performance and its exhaust gases with those a common diesel engine. Then, another researcher in 2011 was blended TPO with different percentage of diesel fuel and used the mixtures as fuel for a diesel motor. He also investigated the motor performance and its exhaust emissions in the way as previous researcher. As the amount of polluting emissions for the mixtures of TPO and different percentage of diesel fuel are higher than those for pure diesel fuel, so we have endeavored to investigate the effect of adding ethanol to the mixture of TPO plus diesel fuel. Therefore, 10%, 15% and 20% of TPO were blended with diesel fuel and the mixtures were used as fuel in a single cylinder diesel motor. At the same time, the performance of motor and its exhaust emissions were analyzed. Then, with addition of 5%, 10% and 15% ethanol to the above fuel mixtures of TPO and diesel fuel, the same investigation and analysis have been carried out on motor and its emissions. The results show addition of ethanol to the blended mixture of TPO and diesel fuel lead to better burning of the mixture reducing its carbon monoxide (CO) and unburnt hydrocarbons (HC).
    Keywords: Scrap tire, Tire pyrolysis, Tire pyrolysis oil, Waste recycling, Renewable engine fuel