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EN
Knowing the reflection, transmission, and absorption properties of the yarns from which the woven fabric is made, prediction of a fabric’s UV-protective properties is simple. Using the geometrical properties of monofilament yarns and fabrics, which were determined optically, and following the cover factor theory, we have determined the areas of fabrics covered with no yarns, only one yarn, and two yarns. From a special selected set of high-module polyethylene terephthalate (PET) monofilament materials (e.g., fabrics), we have elaborated a method for determining the reflection, transmission, and absorption of yarns. By first defining the differently covered areas of fabrics, we were able to use them in a mathematical model for calculating and predicting the UV-protective properties of the fabrics. The calculated and measured values of the UV-protective properties of the selected test fabrics were highly correlated, with a correlation coefficient >0.98.
EN
The article presents research results on selected properties of knitted products made of alpaca wool and other raw materials. Special attention was paid to properties defining thermal comfort. The material studied were weft-knitted fabrics made of four different yarns: cotton, PAN, sheep wool and alpaca wool. All knitted fabrics were made with different stitches in five variants on a computer controlled knitting machine – Stoll CHS 530 HP. Warmth retention was evaluated using an Alambeta device. The properties tested were as follows: thermal conductivity, thermal diffusivity, thermal absorption, thermal resistance and air permeability. Results concerning the functional properties of the knitted fabrics made of alpaca wool were compared with those obtained for other materials. Generally knitted fabrics made of alpaca wool were positively evaluated.
PL
W artykule przedstawiono wyniki badań wybranych właściwości użytkowych dzianych wyrobów wykonanych z wełny alpaki i innych surowców. Materiał badań stanowiły dzianiny rządkowe wykonane z czterech przędz: bawełnianej, PAN, wełny owczej i wełny alpaki. Wszystkie dzianiny wykonano o różnych splotach w pięciu wariantach na szydełkarce komputerowej firmy Stoll CHS 530 HP. Ocenę ciepłochronności dzianin przeprowadzono za pomocą aparatu Alambeta. Badano: przewodność cieplną, dyfuzyjność cieplną, absorpcyjność cieplną, opór cieplny oraz przepuszczalność powietrza. Dokonano porównania otrzymanych wyników właściwości użytkowych dzianin z wełny alpaki w odniesieniu do dzianin z trzech innych surowców. W ogólnej ocenie dzianiny wykonane z wełen alpaki wypadły dość korzystnie.
3
EN
This publication is a review of the work directed or inspired by the late Professor Andrzej Włochowicz in comparison to the current state of knowledge, and developed by his colleagues as an expression of memory and recognition of the contribution that he made to research on the strength of linear textile products. The article describes issues related to the fatigue strength of yarns. An analysis of literature related to the development of research on fatigue strength was carried out, and quantities describing load cycles and selected cases of periodically variable states of loads are presented. The article attempts to systematise certain problems related to the fatigue of textile materials. The body of the article presents the state of knowledge as well as the manner and the methods of assessment of the fatigue strength of textile materials.
PL
Prezentowana publikacja jest przeglądem prac kierowanych lub inspirowanych przez nieżyjącego Profesora Andrzeja Włochowicza na tle obecnego stanu wiedzy a opracowana przez jego współpracowników, jako wyraz pamięci i uznania dla wkładu, który wniósł do badań wytrzymałości liniowych wyrobów włókienniczych. W artykule opisano zagadnienia związane z wytrzymałością zmęczeniową przędz. Dokonano analizy literatury przedmiotu związanej z rozwojem badań nad wytrzymałością zmęczeniową, przedstawiono wielkości charakteryzujące cykle obciążeń oraz wybrane przypadki okresowo zmiennych stanów obciążeń. W artykule podjęto próbę naukowego usystematyzowania pewnych problemów związanych ze zmęczeniem materiałów włókienniczych. W głównej części artykułu zaprezentowano stan wiedzy oraz sposób postępowania i metody oceny wytrzymałości zmęczeniowej wyrobów włókienniczych.
EN
The modern systems of the assessment of the quality of cotton fiber assembles were introduced. The article brings more closer the most important achievements from the field of the audit of the quality of fibers, the semi-manufactured articles of the spinning and yarns. The first part is devoted on the assessment of the physical proprieties of fibers, in part II were presented the methods of the assessment of cotton fiber assembles, in the form of slivers rovings and yams, whereas in part III were presented the ways of the assessment of the strength properties of yams and issue of clearing cotton yams.
EN
The modern systems of the assessment of the quality of cotton fiber assembles were introduced. The article brings more closer the most important achievements from the field of the audit of the quality of fibers, the semimanufactured articles of the spinning and yarns. The first part is devoted on the assessment of the physical proprieties of fibers, in part II were presented the methods of the assessment of cotton fiber assembles, in the form of slivers rovings and yarns, whereas in part III were presented the ways of the assessment of the strength properties of yarns and issue of clearing cotton yarns.
EN
The modern systems of the assessment of the quality of cotton fiber assembles were introduced. The article brings more closer the most important achievements from the field of the audit of the quality of fibers, the semimanufactured articles of the spinning and yarns. The first part is devoted on the assessment of the physical proprieties of fibers, in part II were presented the methods of the assessment of cotton fiber assembles, in the form of slivers ravings and yarns, whereas in part III were presented the ways of the assessment of the strength properties of yarns and issue of clearing cotton yarns.
EN
The article presents test results on possibility of applying different joining techniques in the formation of pneumatic interlaced component yarns that contain metallized yam components. It discusses the classical technique of forming yarns with metallized elements and examines the possibility of forming pneumatic component yarn by texturing and interlacing technique. Microscopic examination of yarn was also performed.
EN
The present study reveals a comparison of the physical properties of three sets of bamboo/cotton blended yarns of linear density 19.68, 14.76 and 11.81tex with those of 100% cotton yarn. Each set consisted of three yarns of fibre blend ratios 67:33, 50:50, and 33:67. The test results showed that for all the three sets of yarn, the properties of the 50:50 blended yarns were comparable with those of the 100% cotton yarn. In the case of the 19.68-tex yarn set, the 67:33 blended yarn showed properties similar to those of the 50:50 blended yarn. It was also observed that increasing the bamboo content led to a reduction in properties. Thus the quality characteristics of the blended yarn depend upon the bamboo content in the blend.
PL
Przeprowadzono analizę porównawczą właściwości fizycznych trzech zestawów przędz mieszankowych bambus/bawełna o różnej masie liniowej (19.7, 14.8 and 11.8 tex) i różnym stosunku włókien bambusowych do bawełnianych (67:33, 50:50, 33:67) i przędz bawełnianych. Stwierdzono, że właściwości mieszanki 50:50 były porównywalne z właściwościami czystych przędz bawełnianych. W przypadku przędz o masie liniowej 19.68 tex mieszanka 67:33 wykazywała właściwości podobne do mieszanki 50:50. Stwierdzono również, ze zwiększenie ilości włókien bambusowych powoduje pogorszenie właściwości przędzy.
9
Content available remote Comparitive studies on ring rotor and vortex yarn knitted fabrics
EN
Ring, Rotor and Air vortex spinning systems provide yarn with different structures and properties. Each system has its limitations and advantages in terms of technical feasibility and economic viability. 30's Ne, 100%cotton yarns were produced from the above systems and knitted in single jersey machine. The Rotor Spun yarns found with frequent breakage during knitting. Comparatively good knitting performances have shown by the Ring and Air vortex yarns. Tensile, evenness and hairiness of the yarns and bursting strength, abrasion resistance, pilling, drapability and color matching of the knitted fabrics were studied. The Ring spun yarns have high strength, low imperfection, and good bursting strength. It has high 'S3' value. Abrasion resistance of Rotor and Vortex yarns made fabrics were found higher than the ring spun yarns. Ring yarn knitted fabric has high bursting strength, Air-vortex yarn knitted fabric has poor drape due to stiffer yarn structure and the MVS yarn fabric has poor pilling resistance. Rotor, MVS yarns made fabrics have good abrasion resistance. Drapability of Vortex yarn knitted fabrics was poor than ring and Rotor yarn knitted fabrics. Good and equal depth of dye shade was found with Ring and Air vortex yarn made knitted fabrics. Ring yarn knitted fabric has shown smooth feeling than the other two fabrics.
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