The characteristics of extension of jets of polymer solutions in secondary high-speed spinnability zones were investigated. The functional dependences were found for determining the hyperelastic ...modulus in different conditions of deformation of polymer jets with different specific viscosity.PUBLICATION ABSTRACT
The mechanism of strengthening of fibre materials fabricated by self-adhesive bonding during aerodynamic spinning was investigated. The effect of the structural indexes on the breaking strength of ...copolyamide, polypropylene, and polyamide fibre materials was assessed. A mixed mechanism of their failure was established. A correlation was found between the structural indexes and the technological parameters of aerodynamic spinning.PUBLICATION ABSTRACT
The characteristics of high-speed, uniaxial extension of short polymer jets obtained from solutions of polyacrylonitrile in dimethylformamide of different concentration were investigated. An ...analytical solution was obtained for the equation describing extension of a viscoelastic jet, the quantitative values of the elastic coefficients were found, and the dependence of the jet profile on this coefficient was demonstrated.PUBLICATION ABSTRACT
The prospects for development of polypropylene nonwoven materials manufactured by the spunbond method in the USA and Western Europe are analyzed. The basic areas of application of nonwovens ...fabricated by melt spinning are given, the features of development of production of these materials on the Russian market are examined, the fundamental characteristics of the materials are indicated, and the polypropylene spunbond capacities introduced by Russian companies are listed.PUBLICATION ABSTRACT
In recent studies, it has been shown that information about scatterer spacing can be obtained from analyzing the phase of the ultrasound echo from various media. Such information proves to be useful ...when examining the ultrasonic backscatter from well-organized tissue, such as the liver. By quantifying the deviations in scatterer spacing and/or varying degrees of regularity, conclusions may be drawn about the underlying pathology of the tissue. This paper examines the physical basis of how the scatterer locations affect the phase of the data. Computer simulations were performed that mimic various scattering conditions and that display the effects of differing degrees of regularity, as well as increases in a diffuse random background scattering component. Results of studies on a phantom are also included to investigate and display the phase response under well-controlled scattering conditions. Finally, in vivo data taken from liver scans were analyzed. In this work, it was shown that the phase of the backscattered signal holds valuable information regarding the pathological state of liver tissue. It is suggested that this simple examination of the phase can be refined into a technique to be used as a method to consistently detect the onset of pathological change.
The characteristics of aerodynamic spinning of fibre materials from ultrathin fibres were investigated. The temperature, fibre velocity, and distribution of forces were found by numerical solution of ...a system of equations with defined initial conditions. The effect of the temperature at the time of lap formation and the stress in stretching on the change in the properties of spun polypropylene and polycaproamide fibres and fibre materials based on them was evaluated.PUBLICATION ABSTRACT
In this review, features of the polyester (PETP) market are studied, the structure of PETP consumption worldwide is given, and the distribution of food-packaging PETP and polymer fibre production ...between the main regions of the world is reported. The preferential development of polyester bottle production in countries of Europe and North America is substantiated, and also the leading place taken by Asia in the production of polyester fibres and threads. A list is given of the main companies and the capacities of existing units producing polyester fibres and threads and food packaging in the United States, Europe, and Asia. The prospects for the development of the recycled PETP market are analysed, and the expediency of expanding its production is shown. The main areas of application are given. Features of the market for PETP and PETP-based products in countries of the CIS and in Russia are investigated. The geography of Russian imports and exports of PETP is given, and also a list of newly commissioned enterprises. PUBLICATION ABSTRACT
Genis et al investigate the structural, physicomechanical, and service properties of fibrous materials from polymer melts. Results confirmed the expediency of their practical use as filtering ...elements for existing and newly developed types of device for individual protection of the respiratory organs.
