Vortex Spinning System and Vortex Yarn Structure

Studying the yarn formation with the swirling air concept arouse of interest of the researchers for a long time because it appears to be easy to understand as a spinning principle. These kinds of systems are known as the vortex yarn spinning systems. The air-jet spinning methods have been developed since it is possible to eliminate the movable elements as the spindle and the traveler in ring spinning or the centrifuge in rotor spinning. The success of Murata vortex spinning (MVS) system which is the newest system after all studies of air-jet systems has been much acceptable especially for the spinning ability of 100% cotton in high speeds (500 m/min) and the yarn structure resembling ring yarn structure rather than rotor yarns. This study summarizes the historical background of vortex spinning, the spinning principle and the structure of the yarn spun on this system, as well as the factors influencing the yarn quality and finally the developments in vortex spinning technology

KONFEKSİYONDA DİJİTAL NUMUNE İLE FİZİKSEL NUMUNE ÜRETİM SÜREÇLERİNİN VERİMLİLİK VE SÜRDÜRÜLEBİLİRLİK AÇISINDAN KARŞILAŞTIRILMASI

Amaç: Bu çalışma ile hazır giyim işletmelerinde uygulanmakta olan, geleneksel numune üretim yöntemi ile dijital iş akışının kullanıldığı sanal numune üretim yönteminin verimlilik ve sürdürülebilirlik açısından karşılaştırılması amaçlanmıştır. Yöntem: Çalışma hazır giyim sektöründe hem geleneksel hem de dijital numune üretim yöntemlerini kullanan bir tekstil firmasında uygulamalı olarak gerçekleştirilmiştir. Belirlenen dört farklı model geleneksel ve dijital üretim süreçleri kullanılarak eş zamanlı üretilmiş, elde edilen veriler verimlilik ve sürdürülebilirlik açısından karşılaştırılmıştır. Bulgular: Çalışmada seçilen dört model için yapılan karşılaştırmada %80 oranında maliyetlerden tasarruf sağlandığı görülmüştür. Geleneksel numune üretiminde belirgin miktarda pastal kâğıdı, yan ürün ve kumaş sarfiyatı oluşurken; dijital numune üretiminde, kâğıt, yardımcı malzeme kullanılmamış, kumaş ise fiziksel testler için çok az miktarda kullanılmıştır. Özgünlük: Dijital iş akışı ile ilgili daha çok ölçülendirme ve gerçekliğe uygunluk yönünden çalışmalar mevcuttur. Ancak, dijital numune üretim süreci ile geleneksel numune üretim süreçlerinin verimlilik ve sürdürülebilirlik açısından karşılaştırıldığı çalışmalara rastlanmamıştır

Some investigations upon the small diameter circular knitted fabrics and their manufacturing machines

Bu çalışmada öncelikle tekstilde küçük çaplı kumaş formlarının elde edilme yöntemleri ve makineleri hakkında bilgi verilmiştir. Buna göre; halat, saç örgüsü, atkı ve çözgü örmeciliği ile hibrit kumaş oluşturma teknikleri kullanılarak küçük çaplı yuvarlak kumaş formları elde edildiği ve bu yöntemlerle elde edilen kumaşlarla, bu kumaşların takviye olarak kullanıldığı kompozit yapıların gerek günlük hayatta gerekse sanayide kullanım alanlarının son yıllarda giderek arttığı görülmüştür. Patent, literatür araştırması ve konusunda uzman ulusal ve uluslararası örme makinesi üreticileri ile yapılan görüşmelerden çift plakada küçük çapta örgü elde edilemediği bunun da temel nedeninin geleneksel çift plaka yuvarlak örme makinelerinde kapak iğnelerinin yükselmesini sağlayacak kamın mekanik açısının, makine çapının küçültülmesinde engel teşkil ettiği anlaşılmıştır. Bu tezde Kurbak tarafından tasarlanan ve teknik tekstil temel yapı elemanı olarak kullanılabilecek minimum bir, maksimum beş değişik iplik materyali ile küçük çapta ve çift plakada örülebilen üç boyutlu bir kordonu örebilecek bir makinenin tasarımı ve prototipinin imalatı için çalışmalar yapılmıştır. Sonuç olarak ülke sanayisi için katkısı olacağını düşündüğümüz, oldukça geniş kullanım alanı bulabilecek küçük çapta ve çift yatakta örme yapabilen iki sistemli bir makinenin tasarımı ve imalatı gerçekleştirilmiştir. İlgili kordon yapısı ve makine için patent başvuruları yapılmıştır. Using the rope, braiding, weaving and knitting techniques small diameter circular fabric forms are obtained in textile. These kinds of fabric forms and their composites are widely used in dailiy life and in the industry as technical textiles. After making literature survey on this subject we have seen that while very small diameter circular knitting machines which could knit plain knitted fabrics on a cylinder, existed in the literature, there is no such machine for knitting of fabrics in rib forms. For the above reason, in this study, the aim was to design a very small diameter circular knitting machine which can knit fabrics in rib forms. After giving some basic knowledge on knitted fabrics and also on classical knitting machines, a functional rib knitted cord is explained. This cord was originally designed by Kurbak and application for Turkish patent of it was made by Kurbak and Soydan with order number 2011/00438. This cord is our interest here because it can be knit on such a very small diameter circular rib knitting machine. During designing of small diameter rib knitting machine, design parameters were so adjusted that this cord can also be knit on the machine. Finally, a very small diameter circular rib knitting machine which has double cylinder with some circular arc shaped needles are designed. The prototype of this machine is manufactured. The Turkish patent application of this machine is also made by Soydan and Kurbak with the patent order number 2011/00483. As a result, it is thought that by giving a newly designed knitting machine this thesis will contribute to the textile machinery industry with global impact

Geometrical Models for Balanced Rib Knitted Fabrics Part III: 2 x 2, 3 x 3, 4 x 4, and 5 x 5 Rib Fabrics

Since there are no such models in the literature, geometrical models for 2 x 2, 3 x 3, 4 x 4, and 5 x 5 rib fabrics are created in this paper. To obtain these models, the degree of widthwise curling for each fabric is assessed from photographs and the regions between the I X 1 rib parts and the curled plain knit parts of the mentioned structures are modeled in this paper, making yarn curvatures continuous throughout the structure concerned. Models created are drawn to scale by the graphical program 3DS-Max. During the creation of these models, it is emphasized that K, values are almost the same for all the m X m rib fabrics and the second kind of spiralities which are effective on m X m ribs are also considered

Basic studies for modeling complex weft knitted fabric structures part III: A geometrical model for 1 x 1 purl fabrics

In this work, a geometrical model for 1 X 1 purl fabric is created by using Kurbak's (1998) model of plain knitted fabric. Drawings of the structure were created by using the graphics program 3DS-MAX. The loop shape obtained was a similar shape to what has been obtained experimentally in real fabrics

Geometrical model for a newly designed three-dimensional functional rib-knitted cord

A functional rib-knitted cord and the knitting machine for its production were designed having Turkish Patent Institute Applications No: 2011/00438 and No: 2011/00483 respectively. Functions such as mechanical, thermal etc. can be cultivated using the designed cord. Our interest here is to introduce this newly designed cord and to give a geometrical model for this cord. The model is created and drawn to scale by using the 3DS-Max computer graphical program. The model is the general one and can be applied to various applications of the structure of various tightness values; therefore, the direct comparison of the model with any set of experimental findings, depending on the application area of the cord, is left for the future. However, the assumptions about obtaining spirally connected loops of the model are observed to be correct, as the loop shapes are similar when we compare them with the real cord knitted as samples. © 2013, SAGE Publications. All rights reserved

Geometrical model for a newly designed three-dimensional functional rib-knitted cord

A functional rib-knitted cord and the knitting machine for its production were designed having Turkish Patent Institute Applications No: 2011/00438 and No: 2011/00483 respectively. Functions such as mechanical, thermal etc. can be cultivated using the designed cord. Our interest here is to introduce this newly designed cord and to give a geometrical model for this cord. The model is created and drawn to scale by using the 3DS-Max computer graphical program. The model is the general one and can be applied to various applications of the structure of various tightness values; therefore, the direct comparison of the model with any set of experimental findings, depending on the application area of the cord, is left for the future. However, the assumptions about obtaining spirally connected loops of the model are observed to be correct, as the loop shapes are similar when we compare them with the real cord knitted as samples

DOBBY SHEDDING MECHANISM ON WEAVING MACHINES : PART 1- ANALYSIS

The project "High Speed Dobby Design for Weaving Machines" with the number of MİSAG-139, which wascarried out the Textile Department of Engineering Faculty at Pamukkale University between the dates 10.08.1999 – 01.08.2001, was successfully completed and approved by TÜBİTAK (The Scientific and Technical Research Council of Turkey). The first part of the paper includes a classification and analysis of dobby machines; besides the information obtained from patent application is included

Yeni tasarlanmış bir rotatif armür konstrüksiyonunda tahrik mekanizmasının sentezi

In this paper synthesis works of a dobby driving mechanism had been explained. Dobby experimental set has been constructed sum of three main parts; driving mechanism, program reading and locking unit; and mechanism for elevating motion to the frames. Sythesis work of driving mechanism is completed using analytical and mathematical approaches. Studied dobby construction is a unique fourteen framed rotary dobby mechanism, design works and experimental set building processes are carried out as part of a research project in a collaborative work of Suleyman Demirel University and Pamukkale University. The most important innovation is in the motion transmission mechanism on the main shaft of the rotational dobby. Main shaft is driven by oscilational motion with dwell period. Constructional analysis and synthesis works carried out during the mechanical designing period of the dobby driving mechanism is given in detail. Proposed dobby design can be considered to be manufactured and advised to be used on most of the standart weaving machines.Bu çalışmada armür tahrik mekanizmasının sentez çalışmaları matematiksel ve analitik yaklaşımlarla açıklanmaktadır. Armür mekanizması tahrik mekanizması, program okuma ve kilit ünitesi ve çerçeve kaldırma mekanizmasından oluşmaktadır. Bu mekanizma tasarım ve deneysel model üretimi Süleyman Demirel ve Pamukkale Üniversitelerinin ortak çalışmaları sonucunda gerçekleştirilmiş olan 14 çerçeveli bir rotatif armür mekanizmasıdır. Bu mekanizmada en önemli yenilik rotatif armür ana miline hareket iletiminin yapıldığı mekanizmadadır. Ana mil beklemeli salınım hareketi ile tahrik edilmektedir. Tahrik mekanizmasının mekanik tasarımı sırasında yapılan konstrüktif analiz ve sentez çalışmaları bu yazıda detaylı olarak verilmektedir. Geliştirilmiş olan armür mekanizmasının üretimi ve standart dokuma makinalarında kullanımı mümkün olabilecektir.Türkiye Cumhuriyeti Kalkınma BakanlığıSüleyman Demirel ÜniversitesiPamukkale Üniversites

Comparison of fabric properties knitted by pin spacer compact and conventional compact yarns

This study examined the influence of pin spacer apparatus attachment on compact yarn quality parameters and physical properties of knitted fabrics manufactured using those 100% cotton compact yarns. Two groups of compact yarns were spun on regular compact yarn spinning frame with and without addition of pin spacer apparatus which is placed at the end of the drawing unit of regular compact yarn spinning frame. Totally eight yarns were spun at four different yarn number levels (Ne 24/1, Ne 30/1, Ne 36/1 and Ne 40/1) and two different spinning conditions (with and without pin spacer apparatus). Spun yarn types were then knitted on the industrial sized plain knitting machine. Knitted fabrics were used in the greige and dyed form to evaluate their bursting strength (kPa), dimensional change, abrasion related mass loss (%), pilling resistance, air permeability (mm/s) and colour difference. Test results were then statistically evaluated and influence of pin spacer attachment on yarn quality parameters and fabric properties was determined. In the frame of this experimental work, attachment of pin spacer apparatus improved compact yarn characteristics especially at yarn evenness, imperfection and hairiness values. In case of knitted fabric properties, it was found that pin spacer apparatus attached compact yarn utilization significantly improved air permeability properties of knitted fabrics. © 2019, © 2019 The Textile Institute