APPROXIMATION OF A MATHEMATICAL MODEL OF THE THERMO-MECHANICAL FUSING PROCESS IN THE SEWING INDUSTRY
Authors: Snezhina Angelova Andonova and Silvia Baeva
Abstract: The use of optimization in various fields of the sewing industry is becoming more accessible, due to the rapidly growing IT industry. A frequently used and effective method for optimizing a technological process is the method of approximation. With this method the investigation of various (unknown or extremely complex) numerical characteristics and qualitative properties of the original objects reduces to working with other objects whose characteristics and properties are already known or more convenient to work with. The aim of the present work is to investigate the nature of the function describing the thermo-mechanical fusing (TMF) process and to derive an effective approximation of this function. This will allow the relatively complex mathematical model of the TMF process to be replaced by its simpler approximation in real production.
Keywords: Approximation; thermo-mechanical fusing process.
Pages: 3-7
MORDANT AND FIXATION TEST OF BONE ASH ON NATURAL COLOURS TOWARDS COTTON AND SILK FABRIC
Authors: Nooryan Bahari, Rum Handayani, Ratna Endah Santoso and Nadia Sigi Prameswari
Abstract: The environmental pollution due to synthetic textile dye waste has induced an increase in the use of natural dyes. In general, the fixation process using alum, lime and tunjung. The novelty of this research is to make bone ash as an initial mordant and fixator. The CaO in bone ash and its absorbent potential makes it worth testing as a pre-mordant and fixator for cotton and silk fibers using natural dyes. This study aimed to determine the effect of bone ash as a mordant and fixator on the immersion of natural dyes from chromolaena, mango leaves and garlic skin. The test stages include: preparation, extraction, fixation and pelorodan. The resulting colour tends not to change. However, the endurance level of the fabric towards washing, sweat, light and rubbing has improved (grades 4-5). It has been proven that bone ash, which is chemically composed of several metal oxides, (CaO) is quite similar to lime (CaCO3), having a high pH (alkaline) level. Therefore, it can serve as an alternative fixator with sodium carbonate (Na2CO3) as the final mordant. The results showed that cow bone ash has a high potential of being used as a pre-mordant material and fixator in the colouring processes of cotton and silk fabrics.
Keywords: Bone ash, final mordant, natural dyes fixator, cotton, silk fabric.
Pages: 8-16
THE MECHANICAL VIBRATIONS OF THE SEWING MACHINE’S NEEDLE PART 2: THE FREE LONGITUDINAL VIBRATIONS
Authors: Wael A. Hashima
Abstract: It is well known that the free vibrations of the sewing needle are divided to lateral free vibration and axial (longitudinal) free vibrations. In this study a theoretical approach will be carried out concerning the sewing needle free longitudinal (axial) vibrations. The work will include the sewing needle with constant cross-section with classical and non-classical boundary conditions and needles with variable crosssections - stepped - type. For all the different calculations scheme of the sewing needles, two items will be emphasized: the linear natural fundamental frequencies and the modal sewing needle shape (normal equations) and time - dependent vibratory pattern of the needle. The sewing process technology of the sewn fabrics has several parameters affecting the free longitudinal (axial) vibrations of the sewing needle as: sudden end breaks, the fabric resistance to the needle penetration: is it elastic or rigid or between both of them ... etc. In addition the penetrating needle force in the sewn fabric, how is it type of relationship with time of penetration? In this study we assumed it is as P = P0 sin(wt) i.e sinusoidal. The effect of the needle linear speed on the modal shape of the sewing needle was evaluated. Also, it has been found the frequency equation of needle axial vibration under the effect of sewing thread break.
Keywords: Mechanical vibration, sewing needle, linear speed, axial vibrations, penetration.
Pages: 17-25
EFFECT OF STYRENE ACRYLIC AND URETHANE POLYMER COATINGS FILLED WITH TITANIUM DIOXIDE ON THERMOPHYSICAL PROPERTIES OF FABRIC SURFACE
Authors: Ihor Horokhov, Irina Kulish, Tatyana Asaulyuk, Yulia Saribyekova, Sergey Myasnykov, Olga Semeshko, Natalia Skalozubova and Natalia Subbotina
Abstract: The goal of the work is to study the effect of styrene acrylic and urethane polymer films filled with titanium dioxide nanoparticles on the change in the thermophysical properties of the cotton fabric surface. Aqueous dispersions of styrene acrylic polymer Lacrytex 640 and polyurethane Aquapol 14 were selected as film-forming substances. Nanosized titanium dioxide was investigated as a thermophysical additive. The effect of the filler on the structural properties of polymer composites was investigated using the equilibrium swelling method. The mechanical properties of the obtained nanocomposites were evaluated in terms of breaking load and elongation at break. The surface morphology of the nanocomposite coated fabric before and after ignition was investigated using scanning electron microscopy. Based on the results of the study of the dependence of the structural and mechanical properties of polymer films on the nanofiller content, it was found that a high degree of polymer - filler interaction efficiency is observed at titanium dioxide concentrations up to 5 wt.%. It has been proven that the interfacial interaction of titanium dioxide with polyurethane Aquapol 14 is higher than that with styrene acrylic polymer Lacrytex 640. It was found that the introduction of nanosized titanium dioxide increases the tensile strength, but decreases the plasticity of nanocomposites in comparison with unfilled polymer matrices. It is shown that the studied styrene acrylic and polyurethane coatings filled with nano-sized titanium dioxide lead to the formation of coke residue on the fiber surface under the action of a flame, which makes it possible to preserve the fabric structure upon ignition. The obtained research results are of practical importance in the development of fire retardants for finishing textile materials.
Keywords: Styrene acrylic polymer, polyurethane, nanocomposite, titanium dioxide, structural characteristics, mechanical properties, coke forming ability, fire retardant coating.
Pages: 26-31
IMPROVING THE DRIVE BELT CLEANING SYSTEM FOR THE POSITIVE FEED MECHANISM OF CIRCULAR WEFT KNITTING MACHINE: A NOBLE APPROACH
Authors: A.K.M. Mobarok Hossain, Md Imranul Islam and Abu Rayhan Md. Ali
Abstract: The yarn delivery rate required to knit fabric with a given stitch quality in a multi-feeder circular knitting machine is generally based on the drive belt speed of a positive yarn feed system. Even if the diameter of drive wheel (also known as Quality Adjustment Pulley (QAP) or Variable Diameter for Quality (VDQ) Pulley) of such system is well adjusted to maintain the required belt speed through positive drive, the stitch length measured on the fabric may not remain uniform as production continues. A key reason for this variation is the growing lint accumulation inside QAP that causes changing circumference of QAP gradually. Such deposition of lint may also occur on other parts of the yarn delivery system causing fluctuation in yarn tension and yarn delivery rate from different feeders, which ultimately causes fabric defect. To counteract such problem a typical brush associated cleaning system has been incorporated into some knitting machines by the manufacturers, which also possesses some inherent limitations. In this study, a noble approach has been carried out to develop an alternative cleaning tool for lint removal from the QAP system using compressed air. Further investigation through this study showed that the developed device exhibits better cleaning performance and is cost-effective than the traditional brush-shelf type cleaning apparatus.
Keywords: Knitting, stitch length, QAP, lint/fluff, compressed air.
Pages: 32-41
THE EFFECT OF DRAWING TEMPERATURE ON THE MECHANICAL PROPERTIES OF PLA FIBRES
Authors: Marcela Hricova, Erika Obertova and Anna Ujhelyiova
Abstract: Polylactic acid (PLA) is one of the possible usable polymers that have the assumption to replace synthetic materials. Fibres made from PLA still do not achieve the properties of fibres made from synthetic polymers, and therefore the effort is to modify the production process of PLA fibres by additions of various additives. The aim of this work was to prepare the biodegradable fibres from PLA and to evaluate the influence of the preparation conditions on their mechanical properties. The special additives were added to the polymer mass to achieve better processability as well as better mechanical properties (tenacity and elongation at break) of PLA fibres. All prepared fibres were drawn at maximum drawing ratio λmax at the drawing temperature 80; 90; 100 and 105°C. The effect of additives and the drawing temperature on the mechanical properties of the prepared PLA fibres was evaluated and discussed.
Keywords: Polylactic acid, biodegradable fibres, additives, mechanical properties.
Pages: 42-47
FORMATION OF FASHION SYSTEM IN THE XX - THE BEGINNING OF THE XXI CENTURY
Authors:N.V. Chuprina, T.F. Krotova, K.L. Pashkevich, T.V. Kara-Vasylieva and M.V. Kolosnichenko
Abstract: The factors that influence the functioning of the fashion system, as well as the formation and realization of fashion trends as a result of design activities, are identified and characterized. Dependences of formation of fashion system on factors of design activity are revealed. The transformation of fashion standards in costume design from artistic and stylistic standards to fashion products in the context of aesthetic criteria of modern culture is characterized. Ethnic style, retrospectivity, eclecticism and artistic kitsch as the basis of project practices and tendencies of anti-globalization and individualization in the fashion of the XXI century are studied. The interconnections in the structure of fashion as a cyclically closed system of formation, production, distribution and consumption of fashion standards and fashion products have been revealed. The structural interaction of the subjects of the fashion system in the process of their activity on the creation of the range of fashionable clothes and the implementation of fashionable innovations is revealed. The conceptual principles of design activity in the fashion system, which influence the formation of the actual design image in the costume design, are studied. The design activity of the subjects of the fashion system is determined as a factor of realization of fashion innovations and standards in the contemporary art and cultural space. The specifics of formation of fashionable project images in activity of design brands in the context of the general globalization of mass culture are defined.
Keywords: Fashion system, design-activity, design brand, costume design, fashion design, fashion standard, objects and subjects of fashion system, fashion innovations, integrated concept of fashion behavior, fashion trend, design practice, fashion product.
Pages: 48-57
TOPOLOGICAL ANALYSIS AND SYNTHESIS OF MACHINE CHAIN STITCHES
Authors: Oleksandr Manoilenko
Abstract:The topological analysis of chain stitches of classes 100, 400, 500, 600 and 800 is performed in the work; the general regularities of their formation are established by dividing them into typical structural elements. Also provide recommendations for creating new and potentially possible types of stitches with the development of graphs and calculation of thread consumption for stitches. The method was used in the work, which includes the main stages of topological analysis and synthesis, namely: formation of problems, division of objects (stitches) into elements, construction of models (morphological matrices), synthesis of object variants, and selection of the most rational variants, application of the method of graphs. The result is a generalized hierarchy of the structure of chain stitches of different classes, which are formed by structural elements (loops, broaches and applying thread or sketches [1]) and possible combinations of stitch types. A code record of the structure of stitch elements in the form of routes of 3D-graphs that determine the geometric length of each thread (excluding the properties of the material and threads) is also obtained. Matrixes of stitch configurations are obtained, regularities of formation of new types of stitches of different classes are revealed and the graph-generator of new types of stitches is offered. Regularities of formation of structures of chain stitches of different classes on the basis of development of the hierarchical scheme of structural elements of chain stitches of different classes, morphological matrices and graphs of formation of chain stitches are also revealed. The method of structural analysis and synthesis of new types of stitches is offered. The obtained results can be used for the synthesis of new or potentially possible types of stitches, determining the cost of sewing threads in the stitch depending on the technological parameters of the stitch and materials (stitch length, thickness of materials under the presser foot of the sewing machine, width of overlock stitch, etc.) stitch quality forecasting and the use of initial data for the design and adjustment of sewing machine mechanisms.
Keywords: Structures of chain stitches, structural analysis, determination of thread length in stitch, 3D stitch graph, stitch intensity matrix, morphological matrix of stitches, chain stitch, chain stitch generator.
Pages: 58-69
THE EFFECTS OF DIFFERENT FIBER TYPES ON THE PERFORMANCE PROPERTIES OF THE LINING FABRIC
Authors: Okşan Oral and Esra Dirgar
Abstract: In this study, the effects of different fiber types (regenerated cellulose fibers and synthetic fibers) on the properties of the lining fabric to be produced were investigated. Weight, seam slippage, strength, friction, drape properties of fabrics to be produced from different fibers (PES, PES/Lycra, Acetate, Rayon and Cupro) were examined. In addition to the important strength properties of the linings made of synthetic fibers, there are disadvantages such as draping and seam slippage. The lining made of Cupro fiber used in this research eliminates these disadvantages and offers an important alternative.
Keywords: Lining fabric, tensile strength, tearing strength, fabric drape, friction coefficient, seam slippage.
Pages: 70-74
DEVELOPMENT AND RESEARCH OF EQUIPMENT FOR PROCESSING OF GRANULATED POLYMERIC MATERIALS VIA 3D PRINTING FOR THE NEEDS OF LIGHT INDUSTRY
Authors: Oleh Polishchuk, Petro Zozulia, Andrii Polishchuk, Pavlo Maidan, Mykola Skyba, Nazar Kostyuk, Andrii Kravchuk and Olha Kravchuk
Abstract: Current state of 3D printing in various industries and prospects of its application in light industry have been analyzed. It has been revealed that pressure and productivity at the outlet of the extruder, as well as quality of melt preparation in 3D equipment for processing polymeric materials in the form of granules depends on the geometric dimensions of the extruder and auger’s working tool. Mathematical modeling of heating process of the polymeric material in the extruder has been done, thermal diagrams have been obtained, which allow to predict the temperature distribution in its different sections. A 3D printer with FMD technology for printing with polymer granules as a raw material has been developed. Resistance to destruction by a wedge-shaped blade of sewing materials with polymeric coatings applied to them by the method of 3D-printing has been researched.
Keywords: 3D printer, 3D print, polymeric materials, waste, installation, auger, heating mode, sewing and footwear materials.
Pages: 75-80
SMART MATTRESS TOPPER WITH ENHANCED HYGIENIC PROPERTIES FOR ECG MEASUREMENT AND DETECTION OF POSITION
Authors: Dana Rástočná Illová, Ľudmila Balogová, Katarína Ščasníková, Michal Gála, Branko Babušiak and Štefan Borik
Abstract: The contribution focuses on technical solution and confirmation of functionality of a prototype of a smart mattress topper with enhanced hygienic properties, designed for monitoring of human biomedicinal data in real time. It involves integration of progressive technologies in a form of low-temperature atmospheric-pressure plasma, application of nanotechnologies in a form of an antimicrobial nanosol and integrated sensing system for monitoring electrical activity of the heart (ECG) and position of a lying person. The sensing system consists of a set of active ECG capacitive textile electrodes with incorporated microelectronics, capacitive sensors for detection of presence and position of a lying person, passive DRL electrode, data, control and communication elements integrated into construction of the mattress topper with an own mobile application. Functionality of prototype of the mattress topper will be demonstrated by measurement of ECG and position of a lying person by means of a patient simulator as well as a real person.
Keywords: Smart topper, antimicrobial nanosol, low-temperature plasma, ECG, position detection.
Pages: 81-86
DETERMINING TENSION OF YARNS WHEN INTERACTING WITH GUIDES AND OPERATIVE PARTS OF TEXTILE MACHINERY HAVING THE TORUS FORM
Authors: Volodymyr Shcherban’, Oksana Kolysko, Gennadiy Melnyk, Marijna Sholudko, Yuriiy Shcherban’ and Ganna Shchutska
Abstract: The research related to determining of the yarns tension when interacting with guide and operative parts of weaving looms and knitting machines having the form of torus in the area of contact with yarn established the mechanism of yarn tension increase behind the guide having the torus form due to change in geometrical dimensions and friction forces within contact area. It was proved that yarn tension increase behind the guide is effected by ratio of radius of internal circumference of torus to radius of working circumference; contact angle between yarn and working circumference of torus; radial contact angle between the yarn and internal surface of torus; physico-mechanical and structural properties of yarn. For multifilament and spun yarn, the actual contact angle is more than nominal one due to yarn diameter distortion in the contact area with surface of torus. Values of contact angles between yarns and working circumference and values of radial contact angles between yarns and internal torus surface shall be determined according to geometrical dimensions and design of guide and operative parts of weaving looms and knitting machines. The paper includes experimental research of interaction between different by its nature yarns and spun yarn (natural, synthetic, and man-made) and surfaces having the torus form imitating guide and operative parts of weaving looms and knitting machines. Based on experimental research the regression relationships between tension values behind the guide and ratio of radius of internal circumference of torus to working circumference radius, yarn tension prior it goes to guide and nominal value of contact angle were obtained for cotton, woolen, linen spun yarn, and polyamide multifilament. The analysis of the regression relationships made it possible to establish ultimate values of geometrical dimensions for guide having the form of torus when tension has its minimum value. This will enable minimization of the yarn tension during its processing on the weaving looms and knitting machines. This leads to a decrease in yarn breakages, an increase in the production equipment performance by reducing its downtime, improving the quality of the fabric and knitted garments produced. This suggests a practical value of the proposed technology solutions. These latter are related, in particular, to determining optimal geometric dimensions of guides and operative parts of weaving looms and knitting machines having the form of torus in the area of contact with yarn, at which the output tension will have the minimal required degree. Therefore, there is a good reason to claim the possibility of guided management of the process of changing the yarn tension in weaving looms and knitting machines by choosing geometrical dimensions of high-curved guide for specific yarn types.
Keywords: Tension, yarn, guide surface having the torus form, contact angle.
Pages: 87-95
PERFORMANCE OF TEXTILE MATERIALS FOR THE NEEDS OF CHILDREN WITH SKIN PROBLEMS
Authors: Marcela Skodova, Viera Glombikova, Petra Komarkova and Antonin Havelka
Abstract: TThis study focuses on the experimental investigation of the efficiency of knitted fabric for the needs of children with skin problems. The aim of this study was to compare the end-use properties of commonly available cotton knitted fabrics with other knitted fabrics from fibres mixtures such as Tencel, Viloft, Micromodal, Crabyon, polypropylene with Ag+ and linen. The physiological and sensory comfort of knitted fabrics was determined by laboratory measurements. The following parameters were tested on selected knitted fabrics: pilling, total hand value, air permeability, thermal effusivity and water vapour permeability. The results suggest that knitted fabrics made from viscose fibre or linen have been shown to be better or comparable as cotton. In addition, some viscose materials (with chitosan) and linen are antibacterial, antistatic and thermoregulatory. Clothes made of mixtures of viscose fibres or linen can substitute for cotton fabrics for clothing intended for children with skin problems.
Keywords: Physiological and sensory comfort, skin problems, Tencel, Viloft, Micromodal, Crabyon, polypropylene, linen.
Pages: 96-101
ANALYSIS OF FORCE INTERACTION BETWEEN PUNCHEON’S WORKING TOOL AND METAL FITTINGS AT THE STAGE OF DEFORMATION OF PUNCHEON’S LAST CONIC PART
Authors: Mykola Skyba, Oleh Polishchuk, Vitalii Neimak, Taras Romanets, Andrii Polishchuk, Svitlana Lisevych and Maksym Luchynskyi
Abstract: The article deals with force interaction between puncheon working tool and metal fittings at the stage of deformation of puncheon’s last conic part. Eyelet’s deformation stages have been studied, components of eyelet’s stress-strain state have been analyzed, and eyelet’s deformation effort with puncheon’s conic surfaces has been calculated. A series of experiments to prove validity of the obtained mathematical model has been conducted. The obtained dependencies can be used to achieve approximate calculation of maximum efforts of metal eyelet’s deformation with puncheon’s conic surfaces.
Keywords: Eyelet, fitting, deformation effort, puncheon.
Pages: 102-105
DEVELOPMENT OF THE PRODUCTION MODEL OF SCALING UNIFORMITY OF THE ASSORTMENT COMPLEX CLOTHING FAMILY LOOK
Authors: A. Slavinska, О. Syrotenko, V. Mytsa and O. Dombrovska
Abstract: The problem of combining the image system with the image types of social order for a new line of fashion trends has been investigated. A methodology for generating a productive model of systematic database selection using numerical methods for solving scaling problems has been developed. The mechanism of typing of similarity on the basis of compositional homogeneity of models in patterns of consumer demand has been investigated. An algorithm for determining the coefficients of proportionality of the constructions of the range of complexes has been developed, taking into account the gender, age and style features. It has been established that the production model of scale of control measurements provides technical conditions of quality control of design documentation.
Keywords: Image, product range, production model, scale, similarity types, homogeneity, proportionality factor, control measurements, design documentation.
Pages: 106-117
TEMPORAL EVALUATION OF CUSTOMIZED CLOTHING PATTERNS AND PATTERN DESIGNS
Authors: Gökçe Tabaklı, Zümrüt Bahadır Ünal and Eda Acar
Abstract: With the development of garment manufacturing, huge amounts of garment production in short time has been possible; which led to an increase in the profitability of companies and meeting customer expectations. But in due course, with the increase of household income, customers started to ask for dressing different than other individuals instead of wearing same clothes with everyone. Therefore, in order to maintain the variety of styles in manufacturing, the production quantities have decreased and the production methods have been evolved in this direction. Accordingly, due to meet these new expectations, customized clothing production concept has been born. The main fact which differentiates this production method from the old style tailoring is that; the design is also personally customized. The fabric, color, design, pattern details of the cloths can be customized according to customer choice. All of above points naturally increase the cost of the product. However in this method, the main importance is the customers who aspire their dream cloth instead of the product price. With this research, the systems which is needed to meet the new high level customer expectations have been analyzed; the production lead time and the effect of this method on the labour has been investigated in a facility which is making customized production.
Keywords: Customized clothing design, production time, pattern placement.
Pages: 118-121
STUDY ON VARIOUS DISPERSANTS IN PP MASTERBATCHES AND FIBRES MODIFIED BY PROTECTIVE PHOTOLUMINESCENT PIGMENT
Authors: Zita Tomčíková, Štefan Krivoš and Jana Ileninová
Abstract: Polypropylene (PP) doesn't contain functional groups; therefore dyeing in the mass by pigments is used in the dyeing of PP fibres. Dispersants are used to improve dispergation, increasing the homogeneity of the masterbatches. In this work, the influence of three types of dispersants on the processability and processing properties of protective photoluminescent pigment of PP masterbatches as well as the effect of dispersants on the resulting structural and mechanical properties of modified PP fibres were studied. Dispersants D1 and D2 (polyethylene waxes) weren't significantly demonstrated in the preparation of masterbatches, while dispersant D3 (N, N-bis-stearyl ethylenediamine) affected the melt flow index of the resulting masterbatches. The modified PP fibres with the protective photoluminescent pigment were prepared from masterbatches and PP by the discontinuous process of the spinning and drawing associated with the false-twist texturing of the fibres. The influence of dispersants on the resulting properties of the fibres didn't manifest itself significantly.
Keywords: Modified PP fibres, masterbatches, properties, photoluminescent pigment, dispersants.
Pages: 122-127
THE DRAGON IMAGE AS AN INSPIRATION IN THE DESIGN OF COSTUMES WITH CONSIDERING TECHNICAL ASPECTS
Authors: Olena Yakymchuk, Mariia Artemenko, Olena Chepelyuk, Anna Polietaieva, Nadiia Myrhorodska, Larisa Shpak, Sergii Gakhovych, Inna Yakovets, Oleksandr Luhovskyi and Mykola Blyzniuk
Abstract: The purpose of the study is determining the main characteristics of Dragon in a prototype and a shielded image for the formation of an inspirational perspective basis used in designing a suit. Analysis was performed on the following parameters: nature, outward, the division and graphics lines, colour gamma. A classification of application spheres of snakeskin imitation in a suit and basic technologies for imitation of snakeskin in a suit was created. A three models of a men’s and women’s suits were created, which provide a visual representation of the proposed solutions. The recommendations for designing a modern costume with a dragon inspiration have been developed. The series of a men’s and women’s costume have been developed. The research results will allow to develop a visual image’s, that can be used in the design of clothing and the development of a game personages, movie personages, thematic costumes, etc. An image of the Dragon in a movies and cartoons was analysed, and their main characteristics have been identified. As a result, the new costumes that reflect a modern vision of such transformation where created.
Keywords: Textile materials, image, dragon, costume design, inspiration.
Pages: 128-137
EXPERIMENTAL INVESTIGATION OF MULTILAYER THERMAL INSULATION MATERIAL PERFORMANCE WITH USING OF DISCRETE HEAT TRANSFER MODEL
Authors: Alexander Zasornov, Iryna Zasornova and Inna Marynchenko
Abstract: This paper describes the results of multilayer thermal insulation material performance investigation with using of discrete heat transfer model. The material presented can be used in special clothing for high temperature protection. The thermal insulation efficiency is estimated by the analysis of temperature dependencies at the outer and inner surfaces of the presented material. The analysis is performed with using the technique on the base of heat transfer equations discretization. The proposed technique is realized with numerical differentiation error estimation procedure which allows a significant decrease of thermal insulation behavior prediction error.
Keywords: Thermal protective clothing, multilayer material, heat transfer, discrete model, numerical differentiation error.
Pages: 138-144
RESEARCH OF THE INFLUENCE OF THE TREATMENT PROCESS OF THREE-CONE PACKING ON CRITICAL SPEEDS OF BOBBIN HOLDER OF THE WINDING MACHINE
Authors: B.S. Zavertannyi, О.О. Akymov, О.P. Manoilenko, M.A. Zenkin, Y.A. Kovalev and S.A. Pleshko
Abstract: The algorithm of critical speeds calculation of the winding mechanism with the account of threecone packing was presented in the work. Computer simulation of the bobbin holder critical speeds of the winding mechanism in the process of packing is carried out. Dependences of change of critical speeds on the thickness of the packing and the angles of the generators inclination were obtained. Recommendations for designing new designs of winding mechanisms are given. The practical importance of the work is to determine the working speed of the equipment for rewinding threads, improving productivity, product quality. The use of the results obtained in the design and dynamic study accelerate the design process of rewinding equipment. The results are aimed at intensifying the rewinding and winding processes in the light industry.
Keywords: Bobbin, critical winding speeds, bobbin holder, resonance, winding mechanism.
Pages: 145-149
PARAMETRIZATION OF THE HIERARCHICAL STRUCTURE OF THE TREE OF PILLS EMERGENCE DURING PILLING FORMATION ON TEXTILE MATERIALS
Authors: Tetyana Zhylenko, Oksana Zakharkevich, Julia Koshevko and Svitlana Kuleshova
Abstract: The article deals with the development of a mathematical description of the distribution of pills on the surface of textile material, which will predict the change in aesthetic performance of the product during wearing by visualizing its appearance taking into account the surface characteristics of the fabric used. This, in turn, will facilitate the process of confection of materials in the manufacture of products that will not lose their appearance for a long time, and will encourage consumers to comply with the requirements of conscious fashion. The research has been conducted on the fabrics of the coat group, the raw materials of which are: lavsan, kapron; lavsan, nitron; wool, lavsan, nitron. In the process of research, it has been found out that under the action of wear factors for a short time the most probable is the formation of a cluster structure of the hierarchical tree of pills, which have a high branching. With the increasing time of the influence of factors formation of a weakly branched structure a pills’ tree is again likely to occur.
Keywords: Fabric, hierarchical structure, pilling, pills.
Pages: 150-156
