نشریه صنعت لاستیک ایران
پیاپی 89 (بهار 1397)

In this paper we discuss the effect of silica filler content on zinc oxide in curing process and the amount of Zn absorbed in the presence of silica gel in atomic absorption spectroscopy instrument. For this purpose the compounds have been made up of the mixture of stearin-butadiene, butadiene rubbers and other components with different contents of silica. Considering the results from rehometer test and the amount of zinc oxide absorbed in atomic absorption spectroscopy instrument for different amounts of silica, 4 new compounds have been introduced containing different amounts of zinc oxide. After doing some tests like mechanical tests (tensile strength, elongation, stiffness and Abrasion) the new compounds have been added to the solvent mixture for atomic absorption analysis. The results show that the maximum zinc absorption happens with the minimum silica content because a stable complex formed between zinc and silica gel results in preventing zinc oxide from taking part in curing process. Besides that adding the fluoric acid solvent for solving the silica gel will result in considerable increase in Zn absorption. The results of different analysis like mooney, Tension of rubber, hardness, abrasion resistance and Reometer tests show that increasing the silica content causes the curing process be slower and less cross links will be formed because of the increase in the amount of zinc oxide absorbed. In what follows studying the amount of zinc absorbed in atomic absorption spectroscopy instrument will confirm the absorption of zinc oxide by silica and forming a stable complex.

Given that in the modern world in all industries seeking to make maximum use of the equipment are high reliability, condition based maintenance is one of the cases to achieve high reliability that In a variety of vibration analysis, temperature analysis, oil analysis, etc. are applicable. Now in the Barez rubber factory temperature analysis, vibration analysis, oil analysis, thermography testing, inspection and flow measurements using the five senses in terms of condition based maintenance are intended and running.

Because of high PCA content of aromatic processing oil, its usage has been banned in EU countries since 2010. In this study the effect of three low PCA processing oils and elastomers were investigated by tests including rheometer, tensile, heat buildup, compression set and abrasion. According to test results, properties of sample containing TDAE from Repsol Company showed best match with those of original tread.

Tire uniformity is an indication of excellent tire performance in terms of force, dimensions and balance. If these criteria are not maintained at an acceptable level, they can have a negative effect on vehicle riding and sound creation. Improving the design of the vehicle and driving more quickly requires a more uniform tire. With the development of materials, improved mixing, precision building and curing, more uniformity is achieved. In this paper, design and construction factors that are effective on tire uniformity are investigated. Uniformity depends on the precise and continuous control of all manufacturing processes and the constant evaluation of tire materials and components. Controlling the cord angle in all various stages of production and precision assembly of components during tire building is among these effective factors. Increasing the use of uniformity grading machines accelerates the assessment of tire uniformity in production, and provides a tool for analyzing the irregularities that builds up in design or construction.

This work aimed at investigating the effects of blend ratio between styrene butadiene rubber (SBR) and butadiene rubber (BR) and SBR type (E-SBR and S-SBR) on properties of SBR/BR tire tread compounds. Influences of these parameters on properties of the tread compounds reinforced by 80 parts per hundred rubber (phr) of carbon black (CB) and silica were also compared. Results reveal that hardness, strengths, and wet grip efficiency were impaired whereas rolling resistance was improved with increasing BR proportion. Surprisingly, the presence of BR imparted poorer abrasion resistance in most systems, except for the CB-filled E-SBR system in which an enhanced abrasion resistance was observed. Obviously, S-SBR gave superior properties (tire performance) compared to E-SBR, particularly obvious in the silicafilled system. Compared with CB, silica gave comparable strengths, better wet grip efficiency, and lower rolling resistance. Carbon black, however, offered greater abrasion resistance than silica.

The purpose of this study was to examine the role of life style components in quality of work life. The research method in this study is based on the objective, applied and based on the nature, survey. The statistical population is the endowment and charity affairs organization in Kashmar. To select the sample, 50 people were selected through random sampling and according to the Morgan table. Data collection tools consist of "lifestyle" and "quality of work life" questionnaires. Inferential statistics and SPSS software were used to analyze information and test hypotheses. Findings indicate that there is a direct and meaningful relationship between the components of lifestyle and quality of work life.

One of the principle factors in the economic development of developing countries, as well as the dynamic economy in the world is "privatization". Escrow process of privatization and market- oriented mechanism to achieve their priorities, and will include a wide range from the complete privatization of the state-owned enterprise is restructuring, This requires reform of the economic system Sakhtarmaly and administrative staffing and use moderation formidable force, eliminate, or cope with laws and government red tape and ... That is the major economic constraints to eliminate or mitigate And ultimately increase economic efficiency and production. This requires efficient management. However, to convey the general policies of Article 44 by the Supreme Leader and his emphasis on strengthening the private sector and the private sector capable Drthqq unique Islamic model-Iranian progressv (According to the guidelines of the Supreme Leader), in this paper has explained the basic principles and objectives for a successful privatization process, and the factors that modify or control measures (management) of successful implementation of this process The system provides an economical and productive, is described.