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    Wyświetlanie 1-4 z 4
    Tytuł:
    Compact Roving for Improved Quality of Ring Spunyarn
    Kompaktowy niedoprzęd dla poprawy jakości przędz rotorowych
    Autorzy:
    Subbiah, K.
    Dhurai, B.
    Subramaniam, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/232777.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    compact roving
    suction pressure
    pneumatic compact
    slot size
    profile tube
    double compacting
    ring spun yarn
    system kompaktowy
    kompaktowa przędza bawełniana
    niedoprzęd kompaktowy
    jakość przędzy
    Opis:
    This article is concerned with the development of a compact system suitable for producing compact roving. The objective is to reduce twist and improve the performance of roving in the subsequent processes. Combed compact cotton yarn with a linear density of 9.84tex was spun from compact and conventional roving. In order to conclude that compactness had been formed in roving, two special tests, namely the minimum twist of cohesion and roving cohesion strength were determined. Yarns produced from conventional and compact roving were compared for their strength, evenness and hairiness. The results show that there was an improvement in the strength and hairiness of the compact yarns produced from compact roving when compared to conventional yarns.
    Artykuł dotyczy opracowania kompaktowego systemu, który umożliwiłby wytworzenie kompaktowego niedoprzędu. Celem jest zmniejszenie skrętu i poprawienie przerabialności niedoprzędu w kolejnych etapach procesu. Kompaktowa przędza bawełniana czesankowa o masie liniowej 9,84 tex była przędziona z wykorzystaniem niedoprzędu kompaktowego i klasycznego. Uzyskane przędze badano określając ich wytrzymałość na rozciąganie, równomierność i włochatość. Wyniki wskazały na zwiększenie wytrzymałości na rozciąganie i polepszenie włochatości przędz wytworzonych z niedoprzędu kompaktowego.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2017, 1 (121); 24-31
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Rolling Tool Development in Order to Improve the Geometry of a Tube Profile and to Reduce the Wear of Mill Rolls
    Autorzy:
    Knapiński, Marcin
    Bobarikin, Yuri L.
    Radkin, Yaroslav I.
    Powiązania:
    https://bibliotekanauki.pl/articles/27315827.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    seamless pipes
    continuous elongating process
    calibers of mill rolls
    accuracy of a tube profile
    rury bezszwowe
    proces wydłużania
    kalibrowanie walców
    Opis:
    Increasing the accuracy of the geometrical parameters of tube profiles is one of the priority areas of modern tube industry. The profile of the calibers of rolls of the reeling mill exerts a significant influence over the distribution of stresses that appear in metal during the deformation process and the process of formation of the correct geometry of the obtained rough tube. The method for determining the optimal geometry of a mill roll profile has been developed. In accordance with this method the geometry of the calibers of the continuous three roll reeling mill was calculated. The research of the influence of geometrical parameters of the calibers of mill rolls on the accuracy of the obtained tube profile, the load of the rolling tool and the wear rate of the contact surface of mill rolls and a mandrel was carried out. The numerical simulation method was chosen as a research method. This method allows to carry out rather accurate analysis and to obtain reliable results on the stress-strain and thermal states of a billet during the material processing, gives the possibility to obtain numerical values of stresses, deformations, load parameters of the process, as well as allows to visualize the results that is essential for assessing the accuracy of the tube profile geometry. Numerical experiments of the elongating process of a rough tube on the three roll continuous reeling mill with different grooving of mill rolls were carried out. It was determined that using of the developed grooving will allow to get a rough tube of a higher accuracy with the minimal deviation from the shape of the profile. The use of the developed method of calculating the geometric parameters of the calibers of the continuous reeling mill will allow to obtain calibers with a high degree of resistance to wear due to the reduction of the resistance of the flow of metal and a uniform filling of the calibers in the deformation zone. The use of this grooving of mill rolls will reduce the load acting on the rolling tool during the production of hot-deformed seamless tubes.
    Źródło:
    New Trends in Production Engineering; 2019, 2, 2; 321-330
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of disturbed flow after an elbow on metrological properties of a Flow Averaging Tube
    Autorzy:
    Kabaciński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/114498.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    velocity profile measurement system
    averaging Pitot tube
    Flow Averaging Tube K-factor
    elbow flow
    automated test stand
    Opis:
    Experimental results of air velocity profiles and Flow Averaging Tubes (FAT®) K-factor measured behind an elbow are presented in this paper. The pipeline diameter was D=150 mm, while the range of mean velocities w=9…30 m/s. Velocity profiles were determined both in the vertical and horizontal plane in the respective distances L/D of a pipeline from 3 to 18. In the places of the measured velocity profiles, three cross-sections of flow averaging tubes (circular, streamlined and two-profile) were placed to determine the characteristics of K-factor. Moreover, a fully automated test stand is presented in this paper. The completed experiment allows shortening the distance between an elbow and a flowmeter installation place and informing about the value of a correction factor, which can be used to minimize the measurement uncertainty of the air flow rate. It was stated that the horizontal plane is better to install a probe because of the velocity profile and better results of repeatability.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 1; 7-16
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flow behavior in weakly permeable micro-tube with varying viscosity near the wall
    Autorzy:
    Gupta, R. R.
    Kumar, V.
    Chand, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/779656.pdf
    Data publikacji:
    2017
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    hollow-fiber
    micro-tube
    permeation
    algorithm
    variable viscosity
    velocity profile
    equation of motion
    navier-stokes equation
    Opis:
    Weakly permeable micro-tubes are employed in many applications involving heat and/or mass transfer. During these processes, either solute concentration builds up (mass transfer) or steep change in temperature (heat transfer) takes place near the permeable wall causing a change in the viscosity of the fluid. Results of the present work suggest that such change in viscosity leads to a considerable alteration in the flow behavior, and the commonly assumed parabolic velocity profile no longer exists. To solve the problem numerically, the equation of motion was simplified to represent permeation of incompressible, Newtonian fluid with changing viscosity through a micro-tube. Even after considerable simplification, the accuracy of the results was the same as that obtained by previously reported results for some specific cases using rigorous formulation. The algorithm developed in the present work is found to be numerically robust and simple so that it can be easily integrated with other simulations.
    Źródło:
    Polish Journal of Chemical Technology; 2017, 19, 4; 16-21
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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