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The Role of Impact Force and Inclined Water Jets on the Performance of Hydroentangled Fabrics

ABSTRACTS第6页
ACKNOWLEDGEMENT第7-12页
NOMENCLATURE第12-14页
CHAPTER ONE:INTRODUCTION第14-28页
    1.1 Application of Hydroentanglement第14-16页
        1.1.1 Hydroentangled Non-wovens Properties第14-15页
        1.1.2 Fiber Application in Hydroentanglement第15-16页
    1.2 Bicomponent Fibers.第16-18页
        1.2.1 Splittable Bicomponent Fibers第17页
        1.2.2 Application of Splittable Bicomponent Fiber第17-18页
    1.3 Splitting Methods第18页
    1.4 Hydroentanglement Development第18-21页
        1.4.1 Hydroentanglement Machines Development第20-21页
    1.5 Previous Research Work第21-25页
        1.5.1 Hydroentanglement Water Jets/Nozzle Geometry第21-22页
        1.5.2 Specific Energy and Jet Pressure第22页
        1.5.3 Fiber Types第22-23页
        1.5.4 Forming Wire第23页
        1.5.5 Impact Force第23-25页
    1.6 Shortcomings of Previous Research第25-26页
    1.7 Research Objectives第26-27页
    1.8 Research Outlines第27-28页
CHAPTER TWO:DESIGNING OF EXPERIMENTAL APPARATUS第28-38页
    2.1 Introduction第28页
    2.2 Statement of Operation第28-29页
    2.3 Designing Consideration第29-31页
        2.3.1 Path Distance Consideration第30页
        2.3.2 Velocity Consideration第30-31页
    2.4 Designing of Apparatus Components第31-35页
        2.4.1 Designing of jet plates第31-33页
        2.4.2 Designing of Pressure Water Tank第33-35页
            2.4.2.1 Calculation for Checking Stress of Tank Shell第33-34页
            2.4.2.2 Calculation for Checking Stress of Top Cover and Bottom Cover第34-35页
    2.5 Components Selection第35页
    2.6 Force Sensor and Personal Computer第35页
    2.7 Assembled of Designed Experimental Apparatus第35-36页
    2.8 Advantages and Limitation of the Apparatus第36页
    2.9 Summary and Conclusion第36-38页
CHAPTER THREE:THEORETICAL ANALYSIS OF IMPACT FORCE第38-47页
    3.1 Impact force第38-46页
        3.1.1 Flow characteristics in the nozzle orifice第39-40页
        3.1.2 Calculation of outlet water jet velocity at nozzle orifice第40-41页
        3.1.3 Impact Force Calculation on the Upper Surface of the Web第41-43页
        3.1.4 Impact force calculation on the individual fibers within fiber web during hydroentanglement process第43-46页
    3.2 Conclusion第46-47页
CHAPTER FOUR:NUMERICAL SIMULATION AND IMPACT FORCE EXPERIMENTS第47-67页
    4.1 Introduction第47页
    4.2 CFD-Phoenics Software Package第47-48页
    4.3 Physical Model第48-50页
        4.3.1.Boundary Conditions第49-50页
        4.3.2 Initial Conditions第50页
    4.4 Numerical Simulation and Grid System第50-53页
        4.4.1 Governing Equations第51-53页
    4.5 Numerical Results and Discussion第53-66页
        4.5.1 Velocity Distribution Depending on Standoff Distance第53-56页
        4.5.2 Pressure Distribution Depending on Standoff Distance第56-60页
        4.5.3 Impact Force Measurement第60-63页
            4.5.3.1 Influence of Water Jet Pressure on Impact Force第61页
            4.5.3.2.Influence of Water Jet Inclination Angle on Impact Force.第61-62页
            4.5.3.3 Influence of Standoff Distance(L_1)on Impact Force.第62-63页
        4.5.4.Influence of Basis Web Weight on Impact Force第63-65页
        4.5.5 Prediction Errors第65-66页
    4.6 Conclusion第66-67页
CHAPTER FIVE:MATERIALS AND METHODOLOGY第67-80页
    5.1 Materials第67-71页
        5.1.1 Testing of Fiber Properties第67-71页
            5.1.1.1 Tensile Properties第67页
            5.1.1.2 Fiber Friction Properties第67-68页
            5.1.1.3 Fiber Length第68页
            5.1.1.4 Fiber Diameter第68页
            5.1.1.5 Linear Density第68页
            5.1.1.6 Specific Resistance第68-69页
            5.1.1.7 Number of Crimps第69页
            5.1.1.8 Fiber Properties Summary第69-71页
    5.2 Equipment第71-75页
        5.2.1 Fiber Web Formation第71-72页
        5.2.2 Experimental Apparatus第72-73页
        5.2.3 Hydroentanglement Unit第73-74页
        5.2.4 Web Support第74-75页
    5.3 Impact Force第75-77页
        5.3.1 Sensor calibration第75页
        5.3.2 Impact force measurement第75-76页
        5.3.3 Apparatus for Impact Force Measurement第76-77页
    5.4 Testing of Hydroentangled Fabrics第77-78页
        5.4.1 Mechanical Properties第77-78页
            5.4.1.1 Tensile Strength第77页
            5.4.1.2 Tear Strength第77-78页
            5.4.1.3 Bursting Strength第78页
            5.4.1.4 Basis Weight第78页
    5.5 Images第78-80页
        5.5.1 Fabric Images第78-79页
        5.5.2 Water jets images第79-80页
CHAPTER SIX:INFLUENCE OF PROCESSING VARIABLES ON FIBER SPLITTING第80-94页
    6.1 Objective第80页
    6.2 Fiber Splitting Evaluation第80-81页
    6.3 Fiber Splitting Before Hydroentanglement第81-82页
    6.4 Fiber Splitting After Hydroentanglement(Based on Designed Apparatus)第82-87页
        6.4.1 Fiber splitting of PA6/PET第82-85页
        6.4.2 Fiber splitting of PET/COPET第85页
        6.4.3 Fiber splitting of hydroentangled fabrics(PA6/PET,PA6/COPET and PET/COPET)based on 10 bars with different inclination angles第85-87页
    6.5 Fiber Splitting After Hydroentanglement(Hydroentanglement Machine)第87-93页
        6.5.1 Fiber splitting of PA6/PET(Based on Hydroentanglement Machine)第87-88页
        6.5.2 Fiber splitting of PET/COPET(Based on Hydroentanglement Machine)第88-89页
        6.5.3 Fiber splitting of PA6/COPET(Based on Hydroentanglement Machine)第89-93页
    6.6 Conclusion第93-94页
CHARPTER SEVEN:ROLE OF PROCESSING VARIABLES ON MECHANICAL PERFORMANCE OF HYDROENTANGLED FABRICS第94-132页
    7.1 Experimental Approach Based on Preliminary Experiment on Designed Apparatus第94-95页
    7.2 Objectives of Preliminary Experiment on Designed Apparatus第95页
    7.3 Results and Discussions of Preliminary Experiment第95-103页
        7.3.1 Tensile Strength of Hydroentangled Fabrics.第96-100页
        7.3.2 Bursting Strength第100-101页
        7.3.3 Tear Strength第101-103页
    7.4 Conclusion of Preliminary Experiments on designed apparatus第103页
    7.5 Main Experiments on Designed Apparatus and Industrial Machine第103-130页
        7.5.1 Experimental Approach of Main Experiments第103-105页
            7.5.1.1 Materials第103-104页
            7.5.1.2 Processing Parameters Based on Main Experiment第104-105页
        7.5.2 Experimental Results,Data Analysis and Discussion of Main Experiments第105-130页
            7.5.2.1 The Effects of Water Jets Inclination angle,Fiber Types on Tensile Strength第105-115页
            7.5.2.2 The Effects of Water Jets Pressure,Fiber Types on Tensile Strength第115-119页
            7.5.2.3 The Effects of Impact Force,Fiber Types on Tensile Strength第119-122页
            7.5.2.4 The Effects of Impact Force,Fiber Types on Strain at Break第122-126页
            7.5.2.5 The Effects of Water Jets Inclination Angle,Fiber Types on Strain at Break第126-127页
            7.5.2.6 The Effects of Water Jets Pressure,Fiber Types on Elongation at Break第127-130页
        7.5.3 Stress-Strain Curve第130页
    7.6 Conclusion第130-132页
CHAPTER EIGHT:SUMMARY,CONCLUSION AND FUTURE WORK PROSPECTIVE第132-135页
    8.1 Summary and Conclusions第132-134页
        8.1.1 Theoretical Analysis,Numerical Simulation and Impact Force Experiments第132-133页
        8.1.2 Effects of Processing Variables on Mechanical Performance第133-134页
        8.1.3 Influence of Water Jet Pressure,Inclination Angle,and Fiber types on Fiber Splitting第134页
    8.2 Future Work Prospective第134-135页
References第135-143页
Appendix第143-147页

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