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  • Investigation of air-jet texturing of technical polyester ...

    Air-jet texturing of technical polyester yarns was performed in order to improve its adhesion to rubber. The air-jet texturing parameters were selected with great care to minimize the mechanical loss.

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  • (PDF) Airjet texturing

    Key words air-jet texturing, yarn wetting, inter- filament friction, loop formation and fixation, spin finish The air-jet texturing …

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  • 32—AN ANALYSIS OF THE AIR-JET YARN-TEXTURING PROCESS PART ...

    An investigation is reported on how variations in overfeed, air-pressure, and texturing speed, wet or dry processing, and the use of an impact element each affect the properties of the yarn textured. The test plan and the test methods are described, prior to a report of the test results.

    Get Price
  • AN ANALYSIS OF THE AIR-JET YARN-TEXTURING PROCESS PART VII ...

    The properties of air-jet-textured yarns are affected by both the supply-yarn properties and the process parameters. The effects of process parameters were first investigated nearly 20 years ago by Wray1, but, in that investigation, pre-twisted supply yarns were used. To-day's texturing technology operates

    Get Price
  • The Mechanism of the Air-Jet Texturing: The Role of ...

    A comprehensive review of the roles played by the airflow, wetting and spin finish on the air-jet texturing process is given. The results of an experimental investigation of the air-jet texturing process using residual spin finish, yarn-to-yarn static and kinetic friction, filament strength, filament diameter, and on-line tension measurements and high-speed cine-photography are reported.

    Get Price
  • The Mechanism of the Air-Jet Texturing: The Role of ...

    The results of an experimental investigation of the air-jet texturing process using residual spin finish, yarn-to-yarn static and kinetic friction, filament strength, filament diameter, and on ...

    Get Price
  • (PDF) Effect of Nozzle Geometry on Air-Jet Texturing ...

    This paper systematically investigates the effect of a number of geometric parameters on the texturing performance of air-jet texturing nozzles.

    Get Price
  • RESEARCH Open Access Investigation of the influence of ...

    Since air-jet texturing process was developed to feed POY yarns, research were carried out by Sengupta et al. (1989) to understand the influence of drawing variables on the properties of air-jet textured yarns made from POYfeeder yarns. Theoretical investigation on nozzle parameters and air –flow on air-jet texturing was

    Get Price
  • E ect of nozzle geometry on air-jet texturing performance

    single air inlet hole located far from the nozzle exit. A curved diverging exit profile is essential for successful texturing. The results of the tests to determine the effect of air inlet angle are inconclusive and require further investigation. The air-jet texturing process is widely known for its ability to produce spun-like

    Get Price
  • (PDF) Supersonic Jet Texturing of Yarns, 76th Thomas ...

    This lecture will. briefly describe the various texturing processes that use. fluid-jets and will then summarize the ongoing air-jet. texturing research undertaken by Dr Acar at Lough-. borough ...

    Get Price
  • NTRS - NASA Technical Reports Server

    Some experimental and theoretical studies have been made of axisymmetric free jets exhausting from sonic and supersonic nozzles into still air and into supersonic streams with a view toward problems associated with propulsive jets and the investigation of these problems. For jets exhausting into still air, consideration is given to the effects of jet Mach number, nozzle divergence angle, and ...

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  • Investigation of the use of High Pressure Water for Spun ...

    texturing jet was further improved by incorporating capillary effect to suck air with water into the texturing zone to improve turbulence in the jet. The results show that water can be used to manufacture spun-like textured yarns. Index Terms— Air-jet texturing, Water/air-jet texturing, spun-like textured yarn. I. INTRODUCTION

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  • 32—AN ANALYSIS OF THE AIR-JET YARN-TEXTURING PROCESS PART ...

    The properties of the supply yarn and the processing parameters together determine the final properties of air-jet-textured yarns. An investigation is reported on how variations in overfeed, air-pressure, and texturing speed, wet or dry processing, and the use of an impact element each affect the properties of the yarn textured.

    Get Price
  • ANANAL YSIS OF THE AIR-JET YARN-TEXTURING PROCESS PART I ...

    The air-jet texturing process spans three decades, and in that time it has seen many improvements in the process and many variations in nozzle design. The heart of the air-jet texturing process is the texturing nozzle. This may vary in design and details but remains unchanged in its underlying principles. Fig. 2 shows an

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  • E ect of nozzle geometry on air-jet texturing performance

    single air inlet hole located far from the nozzle exit. A curved diverging exit profile is essential for successful texturing. The results of the tests to determine the effect of air inlet angle are inconclusive and require further investigation. The air-jet texturing process is widely known for its ability to produce spun-like

    Get Price
  • Investigation of the influence of effect-yarn draw and ...

    Loop density of textured yarns. Figure 3 shows that loop density of steam-jet textured yarns increases and air-jet textured yarn decreases when effect-yarn draw ratio is increased. The decrease of loop density in the case of air-jet textured yarns may be due to smaller loops. It suggests that the increase of effect-yarn draw ratio increases the level of texturing and hence make smaller loops.

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  • Investigation of the influence of effect-yarn draw and ...

    Investigation of the influence of effect-yarn draw and effect-yarn overfeed on texturing performance: comparison between air-jet and steam-jet textured yarn Fashion and Textiles , Dec 2014

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  • Low-Speed Wind-Tunnel Investigation to Determine the ...

    An investigation to determine the aerodynamic characteristics of a rectangular wing equipped with a full-span and an inboard half-span jet-augmented flap has been made in the Langley 300 MPH 7- by 10-foot tunnel. The wing had an aspect ratio of 8.3 and a thickness-chord ratio of 0.167. A jet of air was blown backward through a small gap, tangentially to the upper surface of a round trailing ...

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  • Role of Water in Air-Jet Texturing: Part I: Polyester ...

    Polyester multifilament yams with different frictional characteristics have been air textured under both dry and wet texturing conditions. Wet textured yams are more stable and have higher bulk, and the surface structure of these yarns shows higher loop frequency, lower loop height, and a higher percentage of protrudes and closed and crossed loops for feeder yams with similar frictional ...

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  • Laser texturing of AISI 304 stainless steel: experimental ...

    This paper deals with an experimental investigation of roughness influence on contact angle measurements and proposes a genetic algorithm to identify an empirical regression model to combine roughness and contact angles. A ns-pulsed laser was adopted to ablate different patterns on the surfaces of AISI 304 samples. During the tests, number of repetitions, hatch distance, laser scan speed and ...

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  • INVESTIGATION OF AIR-JET TEXTURING OF TECHNICAL POLYESTER ...

    the air-jet texturing effect on the technical polyesters. Overfeed levels are also kept low purposely as the mechanical performance of the technical yarns is crucial for end-uses. The air-jet texturing of the filament yarns were carried out on a SSM Stähle RM3-T machine, with the following parameters: 300 m/min texturing speed, Hemajet A357 ...

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  • A Review of Some Significant Research Trends in Yarn ...

    Air-jet texturing is one of the several processes used to convert synthetic filament yarns to textured yarns and is the most versatile of all known texturing methods. The air-jet texturing process is widely known for its ability to produce continuous filament yarns with spun yarn like appearance. The process converts flat

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  • Commingled CF/PEEK Hybrid Yarns for Use in Textile ...

    Air-Jet Texturing Machine At the ITB a modified air-jet texturing machine (Type RMT-D, Stähle) is used for producing the commingled hybrid yarn. Opening of the reinforcement and matrix filaments takes places essentially aerodynamically in an air-jet nozzle. The machine allows the usage of different types of the air-jet nozzle and is equipped ...

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  • Increase the Performance of Texturing Machine – A Review

    air jet textured yarns is around 40 to 80% of the feeder yarns, depending on the raw material and processing parameters. Despite this, the air jet textured yarns offer few advantages. The production rate for air jet texturing is 300-600 m/min which is much higher than for spun yarn.

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  • Characteristics of multiphase jet machining: A comparison ...

    Conclusions. Multiphase jet machining (MJM) is a recently developed surface texturing method that introduces water into dry abrasive air jet machining. To explore the effects of water added in MJM, we conducted a series of comparative experiments when water was used (wet condition) or not (dry condition).

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  • House panel demands another investigation into F-35 pilot ...

    Air Force Magazine reported that 27 of those incidents have occurred in U.S. Air Force F-35As, including one F-35A crash in May 2020 where the “work of breathing” may have adversely impacted ...

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  • An Experimental Investigation of the Origin of Increased ...

    An Experimental Investigation of the Origin of Increased NO x Emissions When Fueling a Heavy-Duty Compression-Ignition Engine with Soy Biodiesel 2009-01-1792 It is generally accepted that emissions of nitrogen oxides (NO x ) increase as the volume fraction of bio diesel increases in blends with conventional diesel fuel.

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  • No sign of EgyptAir plane technical problems before ...

    The EgyptAir jet that disappeared last week did not show technical problems before taking off from Paris, sources within the Egyptian investigation committee said late on Tuesday.

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  • Indonesian investigators examine black box from crashed jet

    Indonesian authorities said they would immediately begin examining a damaged black box retrieved on Thursday from the sunken wreckage of a Lion Air jet that crashed off Jakarta this week, killing ...

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  • Ifluence of Yarn Texturing Technological Parameters and ...

    Yarn samples were made from 33 tex multifilament polypropylene yarns containing 72 filaments each. The same filament yarns were used as core and effect yarns. Polypropylene was chosen due to its high importance for upholstery manufacturing. To produce textured yarn, an SSM RMT-D air texturing machine with a Hemajet-LB04 texturing jet was used [16].

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  • Increase the Performance of Texturing Machine – A Review

    air jet textured yarns is around 40 to 80% of the feeder yarns, depending on the raw material and processing parameters. Despite this, the air jet textured yarns offer few advantages. The production rate for air jet texturing is 300-600 m/min which is much higher than for spun yarn.

    Get Price
  • Effect of Filament Characteristics and Processing ...

    yam guide needle jet was used to air texture the filament in the above mentioned studies. In the present investigation, yarn texturing jet of the type having an elongated housing with a venturi supported in one end having conical opening on both the entrance and exit and a yam guide needle positioned in the other end, was used.

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  • New advances on maskless electrochemical texturing (MECT ...

    Costa and Hutchings [18] proposed a simple method for texturing metallic surfaces by electrochemical machining, termed ‘maskless electrochemical texturing’ (MECT). This technique can be regarded as an adaptation of jet ECM [19], [20] to texture surfaces. However, in jet ECM, the process occurs at a single location, whereas MECT occurs with ...

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  • Emel Kaplan, Investigation of Energy Consumption *Erdem ...

    [12, 13] has made a comparison of the manufacturing costs of textile processes, including spinning, texturing, weaving and knitting in their yearly technical re-port. This report contains costs calculated for specific ring and open-end rotor spun yarn for the countries selected. The cost factors which affect the total

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  • Laser texturing of AISI 304 stainless steel: experimental ...

    This paper deals with an experimental investigation of roughness influence on contact angle measurements and proposes a genetic algorithm to identify an empirical regression model to combine roughness and contact angles. A ns-pulsed laser was adopted to ablate different patterns on the surfaces of AISI 304 samples. During the tests, number of repetitions, hatch distance, laser scan speed and ...

    Get Price
  • Conical coaxial impinging air jets: angle effect on the ...

    Herein, an experimental attempt is conducted to research thermal and flow behaviors of an impinging jet exiting from a coaxial type nozzle with a conical outer and a circular inner outlets. The experiments include four different values of the cone angle (Φ = 0°, 10°, 20° and 30°) and several values of the separation distance between the nozzle outlet and the target surface (0.5 ≤ H D ...

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  • Air France crash 'due to pilot and technical failings ...

    Air France defended its pilots, saying they had responded to confused and conflicting information, including multiple warnings and alarms, aerodynamic noises and vibrations.

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  • Technical Problems Push T-7A ... - Air Force Magazine

    The Air Force is requesting limited funding for its T-7A Red Hawk next-generation trainer because of technical issues uncovered in testing, which have pushed back the full-rate production decision on the aircraft by at least a year. The 2022 budget request calls for 188.9 million in research, development, test, and evaluation funding for the T-7.

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  • International investigation into effects of toxic air on ...

    International investigation into effects of toxic air on planes demanded by health association ... exposure to jet oil mist during ... inquiry into the possible technical …

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  • Effect of Filament Characteristics and Processing ...

    yam guide needle jet was used to air texture the filament in the above mentioned studies. In the present investigation, yarn texturing jet of the type having an elongated housing with a venturi supported in one end having conical opening on both the entrance and exit and a yam guide needle positioned in the other end, was used.

    Get Price
  • The potential of UHP and waterjets for additive manufacturing

    Texturing While the surfaces of AM parts may be textured due to the printing process, the surface morphology may not be suitable for coating. Waterjets have been used for texturing of surfaces, Taylor (1995) to prepare them for coatings especially in the automotive industry. Waterjets are also being introduced into the jet engine industry.

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  • Tribological performance of surface texturing in ...

    The use of discontinuous textures on cutting tools still needs further investigation. Textured cutting tools can be beneficial in both wet and dry cutting conditions. The optimization of patterns/grooves depends on cutting conditions and workpiece/tool material. Surface texturing can be successfully used combined with coatings and solid lubricants.

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  • (PDF) Techno-Economical Evaluation of Textured Viscose ...

    They had resisted straightening of curls under the applied heavy load. Denier Air jet textured yarn linear density was higher than its parent yarn. This was as per expectation due to over feed mode of air jet texturising [Rao (1979), Berkeley (1966), Hearle (2001), Goswami (1976) and Usenko (1975)].

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  • State of the art of tool texturing in machining ...

    Mishra et al. (2018a) developed a model for the chip serration and contact length for plain and textured tools based on a linear regression model, which can be used for 2D machining simulations. The simulation results are shown in Fig. 1 and the chips are seen embedded in the textures at greater feed rates. In the case of vc =200 m min and vc =250 m min, the chips completely incorporate ...

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  • American Journal of Engineering Research (AJER) 2013

    In this experimental study the assumption were made in present analysis condition and simplifying equation F(x)= 0.219*x^3-0.947*x^2+1.399*x^1-0.6417 The analysis of MRR v/s PFR of first derivation, second derivation, and first integration are obtained with 95%

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  • Vortex evolution in a round jet

    Cometta, C. 1957 An investigation of the unsteady flow patterns in the wake of cylinders and spheres using a hot-wire probe. Technical Note no. AFOSR-TN-57-760.Document, no. AD 136749: U.S. Air Force Office of Scientific Research.

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  • The AirAsia Crash That Killed 162 Was 'Utterly Preventable'

    The crash of Air Asia Flight 8501 killed 162 people on December 28, 2014. According to sources we talked to, …

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  • Study on the mixing characteristics of circular transverse ...

    A non-streamline bluff-body is generally used as the flame holder of the conventional gas turbine engine afterburner , , , and the simplest example is the V-gutter bluff-body flame holder as shown in Fig. 1.Based on the V-gutter flame holder, the inhale type flame holder, the double V type flame holder and the vapor type flame holder have been developed .

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  • UNITED STATES AIR FORCE AIRCRAFT ACCIDENT INVESTIGATION ...

    united states air force aircraft accident investigation board report f-35a, t/n 12-005053 58th fighter squadron 33rd fighter wing eglin afb, florida location: eglin air force base, florida date of accident: 19 may 2020 board president: colonel bryan t. callahan conducted iaw air force instruction 51-307

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  • Pawel Pawlus - infona.pl

    Advances in Science and Technology. Research Journal > 2020 > Vol. 14, no 3 > 135--140. The paper shows the construction and control of a climatic chamber used for the credibility evaluation of the profilometic measurements. The paper presents a control model using a PID controller and a solution for air circulation. The data regarding the ...

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  • Low Weber number droplet impact on heated hydrophobic ...

    This study investigates low Weber number droplet impact on heated hydrophobic surfaces. Using synchronized high-speed optical and infrared (IR) imaging, we correlate the droplet dynamics to the ...

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  • Pre-/during-/post-laser processes to enhance the adhesion ...

    water/water-air jet (Ref 8), dry ice blasting (Ref 9), or laser (Ref 10) has been studied over the last decade. Among all options, laser is the only treatment which can be integrated with the thermal spray process allowing for a one-step coating process (combining surface preparation and coating deposition). Lasers also offer a better envi-

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  • (PDF) Techno-Economical Evaluation of Textured Viscose ...

    They had resisted straightening of curls under the applied heavy load. Denier Air jet textured yarn linear density was higher than its parent yarn. This was as per expectation due to over feed mode of air jet texturising [Rao (1979), Berkeley (1966), Hearle (2001), Goswami (1976) and Usenko (1975)].

    Get Price
  • UNIfloc A 12 – The Automatic Bale Opener from Rieter

    Product details. With a line production of up to 2 400 kg/h, the UNIfloc A 12 is extremely economical. The …

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  • Experimental Investigations and Statistical Modeling of ...

    This article presents an experimental study of a recently developed process, namely, ultrasonic assisted jet electrochemical micro-drilling (UAJet-ECMD) using pulsed DC voltage power supply. The go...

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  • AIST - Digital Library

    Effect of Time and Coke Amount in Briquette Made of EAF Dust and Coke. Effects of Industry 4.0 in BOF Steel Plants. Efficient and Clean – Big River Steel’s New PL-TCM Sets a World Record in Exhaust Air Purity. Energy Efficiency in Secondary Cooling – New Generation of Air-Mist Nozzles With Reduced Air Consumption and High Cooling Efficiency

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  • Selected Methods and Applications of Anti-Friction and ...

    3.2. The Effect of Surface Texturing by Abrasive Jet Machining on Friction Reduction. Samples prepared for abrasive jet machining using the device presented in Figure 2 were made of 42CrMo4 steel tempered to achieve a hardness of 40 ± 1 HRC. Discs of diameter 52.4 mm and of 8 mm thickness were samples.

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  • (PDF) APPLICATION OF EXISTING YARN ... - Academia.edu

    Air-jet texturing process and/or conventional spinning method will be given priority to make the banana fibre yarn since that technology available and could be modified. Air-jet texturing method will be conducted at Stretchline Covered elastomeric yarn plant and the conventional ring spinning will be conducted at SLITA.

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  • MASTER OF TECHNOLOGY (M.TECH) (TT/TC) DEGREE COURSE

    MASTER OF TECHNOLOGY (M.TECH) (TT/TC) DEGREE COURSE M.TECH (F IRST SEMESTER) Index No. Title of Papers Hours per week TT 501 Developments in Fibre Production 4 TT 503 Structure and Properties of Fibres 4 MA 505 Advanced Mathematics & Computer Programming 4 Any one group of the Electives : Group A TT 507 Theory and Design of Spinning Machinery 4

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  • Journal of Nonde- and Chemical Fibres

    core-and-effect and normal air-jet tex-tured yarns. Textile Research Journal 2004; 74, 3: 259-264. 24. Demir A and Behery HM. Synthetic fila-ment yarn: texturing technology. Pren-tice Hall, Upper Saddle River, USA, 1997; p. 128-134. 25. Foster PW, Aggarwal RJ, Lu BI, Gu-nasekera USW and Cork CR. A new concept in cooler design for false-twist

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  • Investigation and recent developments in aerodynamic ...

    Investigation on new methods of drag reduction and thermal protection for hypersonic velocities are proposed based on the new technologies for shock reconstruction. In principle, a blunt vehicle flying at high speeds generates a strong bow shock wave ahead of its nose, which is responsible for the high drag and aero heating levels. There have been a number of efforts devoted towards reducing ...

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  • The Effect of Surface Texturing on Dry Gross Fretting

    Texturing was performed using abrasive jet machining with the use of laser-cut masks made of two-layer engraving foil. Masks were cut with the use of a 45 W CO2 laser. The abrasive used for texturing was aluminum oxide (Al2O3) with 99.9% purity with grain size between 75 and 106 m.

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  • Investigation of ventilation demand variation in unsteady ...

    Similar to the setup from , the gust generator is installed at the upstream of the test section ().Unsteady flows are generated by the continuously flapping NACA0020 hydrofoils (detailed in ) with various range of AoA and f g imposing a vertical perturbation in the flow that propagates downstream. During the experiments, supercavitation is generated by ventilating air behind the cavitator.

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  • UNITED STATES AIR FORCE AIRCRAFT ACCIDENT INVESTIGATION ...

    UNITED STATES AIR FORCE AIRCRAFT ACCIDENT INVESTIGATION F-15C, T/N 86-0176 ROYAL AIR FORCE LAKENHEATH, UNITED KINGDOM 15 JUNE 2020 At 0827 zulu time (Z) (0927 local time (L)) on 15 June 2020, an F-15C, tail number (T/N) 86-0176, from the 493rd Fighter Squadron (493 FS), Royal Air Force (RAF) Lakenheath, United

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  • Air France crash 'due to pilot and technical failings ...

    Air France defended its pilots, saying they had responded to confused and conflicting information, including multiple warnings and alarms, aerodynamic noises and vibrations.

    Get Price
  • Experimental Investigation on the Flow Resistance of a ...

    Experimental Investigation on the Flow Resistance of a Staged Fuel Injector with Thermal Protection. Jingyu Zhang,1 Xinyi Wang,1 Yu Wu,1 and Xiaomin He1. 1College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China. Academic Editor: Jun-Wei Li.

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  • Lion Air crash: Pilot on previous flight made distress ...

    Lion Air crash: Pilot on previous flight made distress call before continuing to fly. THE pilot on the ill-fated Lion Air jet’s previous flight made a distress call just minutes after takeoff ...

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  • Investigation of air-jet texturing of technical polyester ...

    Air-jet texturing of technical polyester yarns was performed in order to improve its adhesion to rubber. The air-jet texturing parameters were selected with great care to minimize the mechanical loss.

    Get Price
  • (PDF) Airjet texturing

    Key words air-jet texturing, yarn wetting, inter- filament friction, loop formation and fixation, spin finish The air-jet texturing process produces spun-like yarns by this entrained water, usually adhered to the surface of the modifying the uniform arrangement of the synthetic con- filaments and trapped between them, meets the incoming tinuous ...

    Get Price
  • 32—AN ANALYSIS OF THE AIR-JET YARN-TEXTURING PROCESS PART ...

    An investigation is reported on how variations in overfeed, air-pressure, and texturing speed, wet or dry processing, and the use of an impact element each affect the properties of the yarn textured. The test plan and the test methods are described, prior to a report of the test results.

    Get Price
  • AN ANALYSIS OF THE AIR-JET YARN-TEXTURING PROCESS PART VII ...

    The properties of air-jet-textured yarns are affected by both the supply-yarn properties and the process parameters. The effects of process parameters were first investigated nearly 20 years ago by Wray1, but, in that investigation, pre-twisted supply yarns were used. To-day's texturing technology operates

    Get Price
  • The Mechanism of the Air-Jet Texturing: The Role of ...

    A comprehensive review of the roles played by the airflow, wetting and spin finish on the air-jet texturing process is given. The results of an experimental investigation of the air-jet texturing process using residual spin finish, yarn-to-yarn static and kinetic friction, filament strength, filament diameter, and on-line tension measurements and high-speed cine-photography are reported.

    Get Price
  • The Mechanism of the Air-Jet Texturing: The Role of ...

    The results of an experimental investigation of the air-jet texturing process using residual spin finish, yarn-to-yarn static and kinetic friction, filament strength, filament diameter, and on ...

    Get Price
  • (PDF) Effect of Nozzle Geometry on Air-Jet Texturing ...

    This paper systematically investigates the effect of a number of geometric parameters on the texturing performance of air-jet texturing nozzles.

    Get Price
  • RESEARCH Open Access Investigation of the influence of ...

    Since air-jet texturing process was developed to feed POY yarns, research were carried out by Sengupta et al. (1989) to understand the influence of drawing variables on the properties of air-jet textured yarns made from POYfeeder yarns. Theoretical investigation on nozzle parameters and air –flow on air-jet texturing was

    Get Price
  • E ect of nozzle geometry on air-jet texturing performance

    single air inlet hole located far from the nozzle exit. A curved diverging exit profile is essential for successful texturing. The results of the tests to determine the effect of air inlet angle are inconclusive and require further investigation. The air-jet texturing process is widely known for its ability to produce spun-like

    Get Price
  • (PDF) Supersonic Jet Texturing of Yarns, 76th Thomas ...

    This lecture will. briefly describe the various texturing processes that use. fluid-jets and will then summarize the ongoing air-jet. texturing research undertaken by Dr Acar at Lough-. borough ...

    Get Price