• Title/Summary/Keyword: knitted fabric

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Changes of Pulling-out Length and Shrinkage Ratio in Polyester/Spandex Power Net Warp Knitted Fabrics

  • Lee Choon-Gil
    • Fibers and Polymers
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    • v.7 no.1
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    • pp.51-56
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    • 2006
  • Power net fabric is one of the highly extensible two-way fabrics. Power net structure shows special characteristics in the wearing of final functional clothes. This research evaluated effects of treatment temperature on proportional extensibility and shrinkage ratio of spandex at a given wale length. As treatment temperature increased, extensibility increased proportionally to the standard length of the sample and the shrinkage ratio in the direction of course and wale increased. The pulling-out length increased proportionally to the standard length of the sample. However it was affected by the effect of treatment time and temperature due to the thermal properties of spandex filament yarn.

Characterization of Stitched Multiaxial Warp Knit Fabric Composites and Channel Beam Manufacturing (Stitched 다축경편 복합재료의 기계적 특성 및 U 빔 성형)

  • 변준형;이상관;엄문광;김태원;배성우;하동호
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2002.10a
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    • pp.280-283
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    • 2002
  • In the manufacturing of large scale composite structures, the cost-effective processing and the enhancement of structural performance are critical. One of the most effective ways for this purpose is to use stitched multiaxial warp knitted (MWK) perform in the resin transfer molding process. This study reports the effect of stitching on the mechanical properties of MWK composites, and the feasibility processing of the thick U-beam structure utilizing the stitched preforms. Permeability of the preform, viscosity and cure property of the epoxy resin have been measured. The results of resin flow analysis has been used in determining the gate/vent locations of the RTM mold. Cross-sectional observation of the channel beam prototype demonstrated that the resin impregnation was almost complete, except for some surrounding area of stitched yarns.

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Stress Analysis of Mechanically Fastened Joints in MWK Composite Laminate with Different Geometric :Factors and Loading Conditions (다축경편 복합재료 평판의 기계적 체결시 기하학적 형상 및 하중조건에 다른 응력해석)

  • Choi J.-M.;Jo M.-G.;Chun H.-J.;Byun J.-H.
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2004.04a
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    • pp.246-249
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    • 2004
  • When MWK (Multiaxial Warp Knitted Fabric) composites are applied for the structures, the connections of each component using mechanical fastening is needed. The local contact between the bolted joint and the composite laminates may induce high stress concentration or breakdown in the laminates for the mechanical joints. There for, it is strongly required to study the characteristics of mechanically joints of MWK composite laminates. In this study, stress analysis near the hole boundary of MWK composite laminate is conducted with various geometric factors under different loadings. In the case of multi-pin loaded MWK composite laminates, the results show that the types of loadings and geometric factors of mechanical joints have a significant influence on the joint performances.

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Survey of Colorfastness of Korean Silk Fabrics (국내산 견직물의 염색견뢰도조사)

  • G. Freddi
    • Journal of Sericultural and Entomological Science
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    • v.32 no.1
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    • pp.68-72
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    • 1990
  • The color fastness of Korean silk fabrics was measured in this investigation. The sample fabrics under examination were divided into four groups, according to the processing cycle: 1) Plain dyeing(A-C) : 2) Yarn dyeing(D;E=Knitted fabric) ; 3) Direct printing(F-H) ; 4) Discharge Printing(I-P) : The following result can be obtained. Among the samples examined, both the plain-dyed(brilliant colours) and discharge-printed (put-in colours) fabrics show lower values of water, perspiration and ironing color fastness compared with those recommended by International Organization for Standardization(I. S. O.)

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The study on the penetration and washing features of blood on the surface of fabric (천에 혈액이 침투되는 특성 및 침투된 혈액이 세탁되는 특성 연구)

  • Kim, Yeounjeung;Lim, Jaehee;Hong, Sungwook
    • Analytical Science and Technology
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    • v.30 no.5
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    • pp.270-278
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    • 2017
  • The absorption of blood onto the surfaces of white cotton, polyester, rayon, and nylon fabrics was studied. Different categories of fabrics (woven and knitted) with diverse thickness, were manually folded twice to obtain four fabric layers, and $100{\mu}L$ of human blood was dropped onto the surface of the fabrics. The amount of blood that penetrated the fabric layer and the shape of bloodstain observed on the fabrics were influenced by the chemistry, thickness, and texture of the fabric. The blood bearing fabrics were left to dry for 3 days, washed by hand using tap water, and Lumiscene was then sprayed onto the fabrics to enhance the latent bloodstain for comparison of the shape of the bloodstain before and after washing by hand. The features of the bloodstain after washing varied greatly with the recipient fabrics. Additionally, stronger luminescence was observed at the surface where the blood was deposited compared to the background. However, it was confirmed that physical contact during the washing can deform the original shape of the bloodstain. The effect of the drying time on the bloodstain after hand washing was also studied. $100{\mu}L$ of blood was dropped on the surfaces of the fabrics and dried for 0, 1, 12, 24, 72 h, and 7 days, then washed by hand, before the bloodstain was enhanced with Lumiscene. The results of this experiment indicated that the increased drying time induces stronger chemiluminescence of Lumiscene. However, after drying of the bloodstain for 7 days, the luminescence of the bloodstain was decreased at the blood deposited site and increased around the blood deposited site.

Performance Evaluation of Fabric Sensors for Movement-monitoring Smart Clothing: Based on the Experiment on a Dummy (동작 모니터링 스마트 의류를 위한 직물 센서의 성능 평가: 더미 실험을 중심으로)

  • Cho, Hyun-Seung;Park, Sun-Hyeong;Kang, Da-Hye;Lee, Kang-Hwi;Kang, Seung-Jin;Han, Bo-Ram;Oh, Jung-Hoon;Lee, Hae-Dong;Lee, Joo-Hyeon;Lee, Jeong-Whan
    • Science of Emotion and Sensibility
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    • v.18 no.4
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    • pp.25-34
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    • 2015
  • TThis study explored the requirement of fabric sensor that can measure the motion of the joint effectively by measuring and analyzing the variation in electric resistance of a sensor in accordance with bending and stretching motion of the arm by the implementation of a motion sensor utilizing conductive fabric. For this purpose, on both sides of two kinds of knitted fabric, namely 'L' fabric and 'W' fabric Single Wall Carbon Nano-Tube(SWCNT) was coated, fabric sensor was developed by finishing them in a variety of ways, and the sensor was attached to the arm band. The fabric sensor consisted of total 48 cases, namely background fabric for coating, the method of sensor attachment, the number of layer of sensors, the length of sensor, and the width of sensor. The performance of fabric motion sensors in terms of a dummy arm, that is, a Con-Trex MJ with 48 arm bands around it was evaluated. For each arm band, a total of 48, fastened around the dummy arm, it was adjusted to repeat the bending and stretching at the frequency : 0.5Hz, ROM : $20^{\circ}{\sim}120^{\circ}$, the voltage was recorded for each case after conducting three sets of repeat measurement for a total of 48 cases. As a result of the experiment, and as a consequences of the evaluation and analysis of the voltage based on the uniformity of the base line of the peak-to-peak voltage(Vp-p), the uniformity of Vp-p within the same set, and the uniformity of the Vp-p among three sets, the fabric sensors that have been configured in SWCNT coated 'L' fabric / welding / two layers / $50{\times}5mm$, $50{\times}10mm$, $100{\times}10mm$, and SWCNT coated 'W' fabric / welding / two layers / $50{\times}10mm$ exhibited the most uniform and stable signal value within 5% of the total variation rate. Through all these results of the experiment, it was confirmed that SWCNT coated fabric was suitable for a sensor that can measure the human limb operation when it was implemented as a fabric sensor in a variety of forms, and the optimal sensor types were identified.

Development of Three-Dimensional Knit Models through Rib & Purl Structures (리브편 조직과 펄편 조직을 이용한 입체 니트 구조의 개발)

  • Choi, Won-Seok;Lee, Youn-Hee
    • The Research Journal of the Costume Culture
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    • v.18 no.1
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    • pp.109-117
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    • 2010
  • Knit fabrics are created on diverse machines with diverse knit loops and conditions to make different patterns and fabric types. Dimensional modifications of knit fabrics can also be achieved by numerous methods such as different knit-loop structures, different types of yarns, or different finishing processes including heat setting, steaming, chemical treatment et cetera. This research develops and explores sophisticated three-dimensional knit fabrics by combining the several different knit stitches including rib and purl. This study focuses on 3D knit models created on modern electronic weft (flat V-bed) knitting machines which have capability of individual needle selection. Several samples of the 3D knitted fabrics are also examined in this research. This research furthermore suggests new types of knitted fashion garment made by using the interesting physical effects.

Development of Functional Maternity Wear for Working Women (직장 여성을 위한 기능적인 임부복 개발)

  • Suh, Chu-Yeon;Park, Soon-Jee;Lee, Hee-Jung
    • Journal of the Korean Home Economics Association
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    • v.45 no.9
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    • pp.37-52
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    • 2007
  • This research developed maternity wear designed with a focus on the essential functions necessary for working women and adaptable to their body changes during pregnancy. Through Martin's anthropometry for 201 pregnant women, the size specifications for maternity wear was determined and a dress form was proposed, in order to provide the manufacturer with reference data and a prototype to verify their products' fit and suitability. From a monthly analysis on the body measurements of pregnant women, significant monthly differences and after pregnancy were found in weight, chest girth, bust girth, under bust girth, waist girth, and hip girth. Dress form was designed based on the average body measurements of women in their 6th to 10th month of pregnancy. The standard dimensions in the 8th month were 90cm (chest), 94cm (bust), 86cm (under bust), 97cm(waist: most protruding part on the side), and 99cm (hip). Compared with Japan's MAT-9 (for nine months), chest girth was the same, while the Korean waist girth and hip girth were larger by 2cm and 3cm, respectively. The woven fabric blouse was evaluated as having the best appearance, while the knitted fabric one was judged as being more comfortable it terms of functionality. For the pants, the design details of the lowered waist and curved waist belt were more functional. The tailored jacket was the best design for working women in terms of both looks and functionality. To summarize, maternity wear for working women, unlike general maternity clothes, should be designed with consideration for the wearer's somatotype and activity. Elastic materials were appropriate for functionality and dealing with physical changes. With the increasing of working pregnant women, such trials are expected to continue in this research area in order to develop functional maternity wear with multi-purposes such as breast-feeding, wearability after delivery and shielding from microwave.

A Study on Tricot Textile Design Process using Tricot CAD Program (CAD 프로그램을 활용한 트리코트 텍스타일 디자인 개발 프로세스 연구)

  • Choi, Kyoungme;Kim, Jongjun
    • Journal of Fashion Business
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    • v.19 no.5
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    • pp.1-16
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    • 2015
  • The appearances and geometry structures of knitted fabrics have important effects on their functions as textile fabrics. Structural design of the woven fabric, prior to the manufacturing processes in the weaving mill, often leads to a similar predictable appearance in the final outcome with the corresponding weave design. The increase of the employment of elastic textile yarns in knitting fabrics for comfort stretch or outdoor sports wear knit products has, however, resulted in difficulties in predicting the final appearance of the knit structure design. Due to the stretchability and exceptional recovery behavior of the elastic yarns such as polyurethane elastomeric yarns, the appearance of the final product often differs from the initial knit design. At textile CAD program for preparing tricot knit designs has been employed in this study to predict the two dimensional appearance of the design. The similarities between the designs and corresponding knit products seem to be acceptable for the two-dimensional textile CAD program in this study. However, when elastomeric yarns are partially employed in the polyester filament tricot product, a considerable amount of departure from the design is apparent due to the constriction and/or deformation of property differences in the elastomeric yarns and polyester filament yarns. Therefore, another purpose of this study is to measure the departure of the final tricot product from the initial tricot design, especially in the case employing elastomeric yarns in the knit structure together with regular polyester filament yarns. For measuring the three-dimensional departure, a 3D scanning system has been used for the mesh reconstruction of the fabric specimen. Hopefully, the result from this study will be used as a guide to modify and improve the current textile CAD program proposed for the two-dimensional simulation of the tricot.

A Survey on the Actual Wearing Condition of Clean Room Wears (Clean Room Wear의 착용실태에 관한연구)

  • 김경화
    • Journal of the Korean Society of Costume
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    • v.48
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    • pp.117-132
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    • 1999
  • This study is focused on the questionaries regarding the physiological comfort and body fitness and freedom of movement for clean room smock and intended to present the basic information in designing more comfortable clean room wear through seizing the discomfort of wearet. The study is designed to survey and analyze the actual wearing condition and its problem applied to 400 workers assigned with two semiconductors manufacturing plants. The result of survey are as follows. 1. Clean room workers bras panties running shirts and 내찬 the as basic underwear since they absorb sweat protect their bodies and make them feel safe and comfortable throughtout the whole year. 2. With regard to body fitness most of the subject assessed it to be suitable but the girth of neck waist and hood is founded to be tight in many cases. 3. Most important selecting criteria of clean room smocks are adaptability of movement body fitness and carrying-ability. Most of repondents prefer side zipper and rib-knitted fabric as the fastening system. 4. As for freedom of movement it is disclosed that the subjects showed more or less of their complaints against its wearing easiness for parts of waist neck armpit and slacks adaptability and adaptability of movement.

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