• Title/Summary/Keyword: Tensile energy

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Characterization of Tensile Energy Aborption in Paper

  • Park, Jong-Moon;James L. Thorpe
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.31 no.5
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    • pp.47-56
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    • 1999
  • Tensile energy absorption in paper has long been measured as the area under the load-elongation curve. Little effort has been made to define where and how that energy is used within the paper itself. Characterization of tensile energy absorption in paper is discussed. Multiple small elements within newsprint and kraft sack have been defined and the energy absorbed in those elements are discussed. The tensile profiles of the weak paper, newsprint, and the tough paper, kraft sack, are presented as separate strain profiles, stress profiles, and strain energy density profiles. This allows a complete analysis of the energy absorption of both papers for comparison or contrast.

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The Modification of Stress-Strain Properties of KOCC by the Mechanical Means

  • Won, Jong-Myoung;Kim, Si-Young
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.39 no.3
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    • pp.24-29
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    • 2007
  • The stress and strain properties of KOCC were modified to improve the performance of KOCC as a packaging raw material. The refining consistency, refining degree, blending conditions and the grammage of handsheet were varied. The stress-strain properties, tensile energy absorption were measured. The refining improved significantly the stress and strain properties of paper, especially at lower refining consistency. The increase of grammage also contributed to the improvement in the stress and strain of paper. It was also found that the refining, blending and grammage contributed to the increase of tensile energy absorption. However, it is strongly recommended to apply the combination of refining consistency, refining degree and mechanical treatment(blending).

Studies on the Relationship between Structural Parameters of Yarns and Fabrics and Fabric Hand (원사 및 직물의 구성특성치와 직물 태 변화에 관한 연구)

  • 전병익;오애경
    • Textile Science and Engineering
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    • v.30 no.2
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    • pp.125-139
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    • 1993
  • A Study has been carried out on the hand properties of PET filament fabrics with highly twisted filling yarns in connection with such fabric construction parameters as fineness, twist level. fabric density and weave structure. From this study the following conclusions are made: 1. Bending rigidity is a major factor affecting the stiffness(Koshi). The anti-drape(Hari) and the flexibility with soft feeling(Shinayakasa) on the fabric. Bending rigidity also increases along with the fabric density. 2. Tensile energy is a major factor reducing Kishimi. The increase of the fabric density as well as the yarn twist level increases the tensile energy. 3. compressional energy is a major factor reducing Fukurami. Which is an important hand characteristics of New Synthetic Fabrics(Shingosen). The compression energy increases as the yarn twist level 4. Surface characteristic is a major factor for Shari. Geometrical roughness decreases as the fabric density increases and the yam twist level decreases.

A Study of the Tensile Properties for Poly(trimethylene terephthalate, PTT) 1×1 Rib Knitted fabrics (Poly(trimethylene terephthalate, PTT) 1×1리브 편성물의 신장특성에 관한 연구)

  • Choi, Jae-Woo;Jang, Boung-Sik
    • Journal of the Korean Society of Industry Convergence
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    • v.9 no.4
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    • pp.337-341
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    • 2006
  • The tensile properties of Poly(trimethylene terephthalate, PTT) $1{\times}1Rib$ knitted fabrics were experimentally studies, and the specimens has $1{\times}1$ rib stitched structure which are weft knitted fabrics with various lengths of loop. The $1{\times}1$ rib weft knitted fabric showed larger tensile linearity, tensile energy and tensile resilience in the direction of courses. The tensile properties increased with increasing the loop density in all directions, and perfectly increased with the course directions than the wale directions.

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A Study on the Tensile Properties of Polyester Warp Knitted Fabrics (폴리에스테르 경편포의 신장특성에 관한 연구)

  • 김석근;최재우;남은우
    • Textile Coloration and Finishing
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    • v.12 no.1
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    • pp.17-24
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    • 2000
  • The tensile properties of polyester warp knitted fabrics of satin and reverse satin structure with various lengths of underlap were studied. In the range of low tension, the satin warp knitted fabric showed larger tensile energy and elongation in the direction of $0^\circ$ and larger tensile linearity, tensile resilience and initial modulus in $90^\circ$. Meanwhile, reverse satin one showed larger initial moduli in 0$^{\circ}$ and larger the others in $90^\circ$. In the range of high tension, the tendencies of both fabrics in $0^\circ$ direction were almost the same as those in all direction. As the under laps were shorter for both fabrics, tensile linearity, tensile energy and elongation increased, but tensile resilience decreased in all directions. However initial moduli were changed little.

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Modification of Stress-Strain Properties of OCC

  • Won, Jong-Myoung;Kim, Si-Young
    • Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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    • pp.445-450
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    • 2006
  • The stress and strain properties of KOCC were modified to improve the performance of KOCC as a packaging raw material. The refining consistency, refining degree and the grammage of handsheet were varied. The stress strain properties, tensile energy absorption were measured for prepared handsheets. The refining improved significantly the stress and strain properties of paper, especially at lower refining consistency. The increase of grammage also had contributed to improve the stress and strain of paper. It was also found that both refining and grammage contributed to the improvement of tensile energy absorption. However, it is strongly recommended to introduce the combination of refining consistency, refining degree and mechanical treatment.

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Effects of Pre-treatments on the Oil Palm EFB Fibers (오일팜 EFB 섬유의 전처리 영향 평가)

  • Kim, Dong-Seop;Sung, Yong Joo;Kim, Chul-Hwan;Kim, Se-Bin
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.44 no.6
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    • pp.36-42
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    • 2012
  • The empty fruit bunch fibers(EFB) of oil palm were examined for optimal utilization of the EFB fibers. The EFB fibers were obtained by shredding EFB, followe by removal of fines. The surface properties of the fibers were modified with various pre-treatments, such as hot water extraction, the soaking treatments with NaOH, $ClO_2$ and n-hexane. The changes in the fiber surface were examined with FT-IR method, which showed the changes in chemical compositions such as pectin, lignin, and etc. according to the pre-treatment methods. And the z-directional tensile testing of the fiber mold made of the treated EFB fibers showed the changes in the bonding strength by the pre-treatments. The fiber mold made of EFB fibers treated with $ClO_2$ showed the greater increase in the tensile energy absorption although the NaOH treatment resulted in the severer impact on the EFB fibers.

Mechanical Properties of Woven Fabrics Made from Thick & Thin Yarn (태세사(Thick & Thin Yarn)로 제작된 직물의 역학적 특성)

  • Shin Hyun-Sae;Kim Young-Sang;Son Jun-Sik
    • Textile Coloration and Finishing
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    • v.18 no.2
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    • pp.39-45
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    • 2006
  • The aim of this work is to develop sense-differentiated textiles using Thick-Thin polyester yarn(T-T yarn) with finer than 1 denier mono filament. The ITY(Interlace Textured Yarn) using T-T yarn with various over feed ratios of PET filament was manufactured with different shrinking percentage of core yarn and then the fabrics were woven on the same weaving 100m using ITY produced. The mechanical properties and the handles of the fabrics were examined with KES-FB system suggested by Kawabata. The shrinkage of ITY was increased with decreasing over feed ratio and increased with increasing heat treatment temperature of T-T yarn. The initial elasticity modulus of ITY was decreased with increasing over feed ratio and heat treatment temperature of T-T yarn. The tensile energy of fabrics was decreased with increasing of over feed ratio, but bending rigidity and shear rigidity of fabrics were increased with increasing of over feed ratio of PET filament. The results indicate that the fabric using T-T yarn with finer than I denier mono filament can be used for the purpose of sense-differentiated textile.

On the Change of Fabric Mechanical properties in Ultrasonic Fabric Washing System (호부직물의 초음파 수세에 의한 역학적 특성의 변화)

  • Lee, Choon-Gil;Park, Sung-Diuk;Oh, Bong-Hyo
    • Textile Coloration and Finishing
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    • v.9 no.4
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    • pp.28-38
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    • 1997
  • Peach skin fabrics were washed by the general and ultrasonic washing systems using different conditions. The physical properties of the washed fabrics were estimated. The following results were obtained through experimental data and their analysis. The tensile properties were changed due to fabric running speed and washing methods. The lower the running speed, the higher the extensibility and resilience and the lower the linearity and tensile energy. In the general washing method, the extensibility and resilience had lower values than those of the ultrasonic washing method and the linearity and tensile energy had the higher values than those of the ultrasonic washing system. The bending properties, bending moment and histeresis, were estimated. These values were generally lower in the ultrasonic washing system than those of the general washing system. The faster the washing speed, the higher the value of hysterisis. The shear properties were affected by the fabric running speed and washing methods. Shear stiffness and hysteresis of shear forces increased according to the increase of the fabric running speed. The values were higher in the general washing system than those of the ultrasonic washing system. The compressional energy was affected by the fabric running speed. The higher the fabric speed the higher the compressional energy. The ultrasonic washing system had lower compressional energy than the general washing system. The higher the running speed, the lower the coefficient of friction and geometrical roughness. The values of geometrical roughness were infienced by the removal of the sizing agent. The higher the remaining sizing agent, the higher the fabric weight and the thicker the thickness of fabric.

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An Approach to Improve Thermal Insulation Properties and Fabric Hand of Wool and Wool-like Fabrics under High Molecular Polyethylene Glycol Treatment (고분자량 Polyethylene Glycol 처리에 따른 모직물과 유사모직물의 보온성과 태의 향상 방안 모색)

  • 조길수;이은주
    • Journal of the Korean Society of Clothing and Textiles
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    • v.21 no.6
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    • pp.1041-1050
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    • 1997
  • This study was carried out to improve the thermal insulation properties of wool and wool- like fabrics by treating the fabrics with polyethylene glycol, to evaluate the fabric hand of PEG treated wool and wool-like fabrics and to grade up the fabric hand of the treated fabrics by treating with softening agents. Wool and wool-like fabrics were treated with high molecular PEG-8,000 by PDC. The thermal release/storage properties were measured on a DSC. Hand of specimens were evaluated by KES-FB system. The results were as follows; 1. PEG-treated fabrics showed thermal storage and thermal release properties by DSC and the heat contents were generally proportional to the add-ons. 2. PEG-treated fabrics showed higher Koshi and lower Numeri and Sofutosa values due to lower tensile energy and recovery and higher bending rigidity and shear stiffness as the add- ons increased. 3. PEG-treated fabrics showed much lower bending rigidity after softening agents treatment.

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