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Register a new userDefinition of Fiber, Bundle and Yarn Strength And Studying Relationship Between them, and Estimation of yarn Density
تحديد قوة شد الليف و الحزمة و الخيط و دراسة العلاقة فيما بينها و تقدير متانة الخيط
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هدف البحث إلى إيجاد العلاقات بين قوة شد الليف و الحزمة الليفية و الخيط. و إيجاد أسلوب بسيط نسبياً يساعد على تقدير متانة الخيوط، تكون فيه قيم معامل الاختلاف (CV) لمواصفات الخيط معطاة ضمن الحدود المتفق عليها. إِذ تجنب تكاليف الأساليب التجريبية، و في هذا البحث أخذ بالحسبان تأثير بعض العوامل المهمة مثل طول الليف و نعومته و برم الخيط و نمرته. و تم التأكد من صحة النتائج بواسطة البيانات التجريبية المنجزة في قسم هندسة ميكانيك الصناعات النسيجية و تقاناتها في كلية الهندسة الميكانيكية و الكهربائية بجامعة دمشق، و كذلك في الشركة الخماسية بدمشق. كما يقدم البحث توصيات و مقترحات إذا عمل بها تساعد على تقدير متانة الخيط مباشرة دون إجراء الاختبارات اللازمة لذلك.
research The aim of this is to find an explicit relationship between the strength of fibers, bundle and yarns. The CV values of the strength are given as well. This provides a relatively simple method for estimation of staple yarn strength, while avoiding some difficulties of an empirical method. The effects of important factors such as fiber length and thickness, twist and count of yarn are considered. The results are verified by published data in Mechanical Engineering of Textile Industries and Their Technologies, Faculty of Mechanical and Electrical Engineering, Damascus University. and also in Al-Kumasiah company in Damascus city. This research provides suggestions if we apply it it will help in estimating directly the yarn strength without manufacturing and suitable testing of the yarn.
References used
Bury, K. V., in “Statistical Models in Applied Science,” John Wiley and Sons, NY, 1975
Chou, T. W., “Microstructural Design of Fiber Composites,” Cambridge University Press, Cambridge, U.K., 1992
(Colman, B. D., On the Strength of Classical Fibers and Fiber Bundles, J. Mech. Phys. Solids 7, 60 (1958
(Daniels, H. E., The Statistical Theory of the Strength of Bundles of Threads, Proc. R. SOC. A183,405 (1945
(Hamburger, W. J., The Industrial Application of the Stress-Strain Relationship, J. Textile Inst. 40, 700 (1949
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In the past four decades, the woven fabrics has been subject to inordinate
competition which has primarily come from the fashion (short runs),
knitting, and nonwoven segments. The weaving machinery manufacturers answered
the pressure of competitio
n by concentrating on the design of looms that offered relatively
very high speeds. Obviously, to meet the demands of the higher productivity on the loom,
the material characteristics and the quality and efficiency of the preceding processes also
needed to be improved. And this improvement is doing by encapsulate the yarn with size
film before weaving, by the sizing process which considered as the heart of weaving.
this research is aimed to studying the affective factors of sizing, and define the ideal
values of it. This research reffered to the effect of sizing machine speed on yarn size
witting time and then on its coating percent, other side the rollers squeezing pressure of
sizing machine and sizing solution viscosity affect on yarn size coating percent too which
affecting on its resistance toward weaving operation and usage later, because , the success
of sizing process leads to success the following stages like, weaving, finishing, and then,
success in fabric usage.
The aim of this study is to determine strength of adhesive single-lap joints of
Aluminum alloys which are widely used in geometric applications. It was investigated to
define the influence of overlap length and surface roughness value on shear stre
ngth of
achieved adhesive joints. It was used Epoxy and Acrylic adhesives to prepare adhesive
joints and all the specimens were subjected to axial tensile tests and the results are
presented as a comparison.
Results of those tests showed that shear strength increased with increasing each of
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Ring, Rotor(O.E) and Air vortex spinning systems provide yarns with different structures and
properties. Each system has its limitations and advantages in terms of technical feasibility and economic
viabilit y Ne 30, 100%cotton yarns were produced
from the above systems and knitted in single jersey
machine .The Rotor Spun yarns found with frequent breakage during knitting.
Yarn quality produced is essential to the economic success of
spinning plants. International competition and market requirements
dictate the necessity to produce quality yarns at an acceptable price.
The purpose of this study was to evaluate the shear and tensile bond strengths of orthodontic
brackets bonded with self etching primer and resin-reinforced glass ionomer cement in comparison with
light cured resin adhesive.
The tested self-etching
primer and adhesive systems produced bond strength values higher than that of the light cured resin
adhesive whereas the resin-reinforced glass ionomer cement showed a significantly reduced bond strength
. Clinically, the use of self-etching primer and adhesive systems is suitable for orthodontic bracket
bonding.
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