• Fibers and Polymers
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• 제5권3호
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• pp.177-181
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• 2004

Current efforts to establish links between geometrical features and mechanical performance of nonwoven fabrics in general, and of point-bonded (spot-bonded) nonwovens in particular has been made using the measurements of Fiber Orientation Distribution Function (ODF) and tensile modulus which occurs during controlled-deformation experiments. Image analysis technique (using the Fast Fourier Transform) was used to quantify the fiber orientation distribution. The results suggest that, within a typical window of processing conditions, the fiber orientation has a significant influence on the anisotropical behavior of nonwoven. The data also suggest that mechanical anisotropy of thermally point-bonded nonwovens is likely to be governed by different load transfer mechanism according to the applied macroscopic tensile direction.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 1996년도 추계 학술발표회
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• pp.413-416
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• 1996

• Fibers and Polymers
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• 제2권3호
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• pp.164-170
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• 2001

Authors studied on the applicability of image analysis technique using a scanner with a CCD (charged coupled deviced) to the evaluation of evenness of nonwovens because it has distinctive features to considerably save time and labor in the analysis compared with other classical methods. As specimens fur the experiment, two different types that are unpatterned and patterned ones were prepared. For the unpatterned specimen, webs were chemically bonded, while for the patterned specimen, webs being thermally calendered with engraved roller. Several webs having various areal densities were prepared and bonded. Coefficient of variation (CV%) was used as a parameter to evaluate the evenness. Scanning conditions could be suitably set up through comparing the total variance to the between-group variance and to the within-group variance, respectively, on the images scanned at the different conditions. The 2D convolution method with smoothing filter kernel was introduced to further filter the noises on the scanned images. After the filtering process, the increase of web areal densities gave an uniform decrease of the CV%. This showed that the scanned image analysis with proper filtering process could be successfully applicable to the evaluation of evenness in nonwovens.

• 한국지반신소재학회논문집
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• 제6권1호
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• pp.39-43
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• 2007

열융착법을 이용하여 보강과 배수기능을 가진 니들펀치 및 스펀본딩 부직포의 지오컴포지트를 제조하였다. 이 다층 부직포의 물성(인장, 인열 및 파영강도, 투수도 등)은 열융착법을 사용하여 제조될 경우 온도, 압력, 접착시간 등의 공정인자에 좌우된다. 따라서, 열융착법으로 제조된 지오컴포지트의 공정인자와 물성의 최적화는 매우 중요하다. 본 연구에서는 인공신경망(ANN)을 사용하여 지오컴포지트의 제조공정 최적화를 위한 알고리즘이 개발되었다. 지오컴포지트의 공정인자를 변화시켜 부직포 성능변화를 예측하기 위한 신경망 모사가 적용되었으며, 분석결과에 대한 제조방법의 효과를 조사하였다.

• 한국지반공학회지:지반
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• 제8권3호
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• pp.61-74
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• 1992

Geoteztile drain의 설계를 위한 기초자료를 제시하기 위하여 배수용 geotextile을 대상으로 평면투수성능을 실험적으로 분석하였다. 일반적으로 압축응력의 증가에 대한 geotextile의 두께, 평면투수계수 및 전수성은 10KN/m2 정도 이하에서 현자한 감소를 보였으며 Geotextile의 평면투수계수는 장섬유부직포가 단섬유부직포나 복합포 보다 낮게 나타났다. 또한 Geotextile의 압축률은 PES. 계부직포가 PP계 부직포 보다 큰 경향을 보였으며 geotextile의 압축음력 e(KN In)와 압축률 Cr(oA)의 관계식은 Cr=13.37 In+23.28로 표시되었고 2KN In"를 기준 으로 한 압축률 Cr'와 평면 투수계수 감소율 Pr의 관계식은 Pr=1.250r'로 표시되었다.

• 한국염색가공학회지
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• 제23권4호
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• pp.304-311
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• 2011

For sound absorption and sound insulation in automobile industry, the sound absorption materials based on meltblown nonwovens were prepared by SMS (spunbond-meltblown-spunbond) technique. And the sound absorption coefficient (${\alpha}$) of the meltblown nonwoven, produced with isotatic-polypropylene(PP), was examined for the various processing conditions such as die-to-collector distance(DCD), nonwoven weight(GSM), and air suction conditions. The meltblown nonwoven for sound absorption materials was composed of bulky microfiber web, increasing with increases in weight and DCD. The sound absorption coefficient(${\alpha}$) was excellent as a sound absorption materials of PAD type composed of SMS(spunbond-meltblownspunbond) nonwovens.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
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• pp.267-272
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• 2008

The purpose of this study is to improve the environmental applicability of nonwovens by using special composition. Polypropylene spunbonded and needle punched nonwovens which have the lower cost than polyester nonwovens were used as the raw materials to manufacture the natural fiber used nonwoven geotextiles. These geotextiles were made by use of the thermal bonding methods and composed of jute(or flax)/polypropylene staple fiber blends were obtained in consideration of environmental application. Finally, the engineering properties of natural fiber used nonwoven geotextiles were investigated as eco-friendly materials.

• 한국염색가공학회지
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• 제7권3호
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• pp.53-59
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• 1995

In foam dyebath assisted with and without solvent (iso-propylacohol) for polyester and polyester(30%)/nylon(70%) (P3/N7) nonwoven fabrics, adsorption behavior of polyester and P3/N7 nonwovens dyed with C.I. Disperse Red 4 (Red 4), C.I. Acid Violet 54(Violet 54) and Red 4/Violet 54 were investigated by determining the K/S value. The K/S values of polyester and P3/N7 nonwovens in the foam dyeing was greatly enchanced by adding the iso-propylalcohol, but these values were not higher than the carrier dyeing. Dyeabilities of polyester/nylon blended nonwoven fabrics to Red 4, Violet 54 and Red 4/Violet 54 in the foam dyeing were influenced by the affinity of dye to fiber.

• Fibers and Polymers
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• 제5권2호
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• pp.139-144
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• 2004

The orthotropic theory is applied for the nonwoven fabrics that have a preferred orientation direction, the case if the structure is not isotropic. The polynomial regression analysis is employed to allow the attainment of more statistically meaningful information. A functional form based on the transformation rule is developed for the orthotropic approach. The predictions thus obtained are seen to be in excellent agreements with experimental data and the resulting compliances exhibit meaningful relationships for the processing conditions. The compatibility of the compliances from tensile and shear analyses has been explored prior to a practical application of the four compliances defining the in-plane strain-stress field.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 1998년도 가을 학술발표회논문집
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• pp.402-405
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• 1998

Among the production technologies of nonwoven fabrics, a needle punching technique has one of the long history aid holds still important place. At the present time, it is used not only for scrimming with woven or knitted fabrics and other nonwoven fabrics, but also for applying the special fibers blending nonwovens at the web forming process in ender to manufacture economical and high value added-Products such as home furnishing industrial and technical purpose. (omitted)