Spin Draw 방사 조건에 의한 폴리프로필렌의 물리적 특성에 관한 연구

신현세 단국대학교 1998 論文集 Vol.32 No.-

This study was carried out to determine the effects of mass flow rate and take-up velocity on the physical properties of polypropylene multifilament. Samples were prepared with different values of mass flow rate (30∼60g/min) and take-up velocity (undrawn: 125∼200, drawn; 500∼800 m/min). Spin-draw filaments designates drawn filaments which have gone through all spin-draw process and undrawn filaments designates filaments taken up prior to the drawing process. Taking the values of density, crystallinity, crystalline orientation of the drawn filaments to be 100%, the respective properties of undrawn filaments were 99, 86, 97% respectively. These values are increased rapidly by the drawing process. The ratio of birefringence of drawn filament to that of drawn filament is low 20∼36%, and 64∼80% of the birefringence develops in the drawing process. So, the drawn filaments orientation is three times higher than that of undrawn filaments. With the increase in the mass flow rate and take-up velocity, the effects of undrawn and drawn process on the characteristics of PP multifilaments increase rapidly with take-up velocity.

기능성 PET filament의 물성 변화에 관한 연구

申鉉世 단국대학교 1993 論文集 Vol.27 No.-

Its superior properties make PET fibers one of the most widely used textile material. However, its high refractive index coupled with the smooth surface characteristic of synthetic fibers result in substantial specular reflection of light at the surface making it difficult to produce deep shades. Another property which can be improved is its drapeability. In this study production of deep shades and enhanced drapeability were attempted by the incorporation of inorganic fillers and subsequent removal of the particles on the surface by alkaline hydrolysis. To minimize the amount of alkaline effluents and to make the process more economical, the hydrolysis was affected by a "dry" process in which dry heat was applied to the fiber coated with an alkaline solution. The effect of different inorganic fillers, SiO_2 and TiO_2 and their content on the melt viscosity and effect of removal of the inorganic fillers by alkaline hydrolysis on the production of deep shades were studied. The melt viscosity of PET chips compounded with SiO_2 decreased significantly with the content of the inorganic filler, but the melt viscosity of the chips compounded with TiO_2 showed only slight changes. The amount of specular reflection of the PET filaments decreased with the amount of SiO_2 in the filament in the as-spun filaments and decreased further on alkaline hydrolysis. The effect was more pronounced when the wavelengths of the incident light were shorter. The amount of SiO_2 particles protruding from the fiber surface icreases with the amount of SiO_2 compounded, and the removal of these particles by alkaline hydrolysis resulted in the formation of micro-crater structure. The micro-crater structure is expected to allow production of deep shades and echanced drapeability.

不織布의 熱的 特性과 保溫性에 관한 硏究 : 두께와 充塡密度 變化에 대하여

申鉉世 단국대학교 1988 論文集 Vol.22 No.-

The study was computed to investigate the thermal and the warmth retaining properties of non-woven fabrics by comparing the changing factors of thickness and air layer of specimen. The results are summarized as follows. 1) The heat conducting coefficients are not affected with the thickness changing factors of non-woven fabric, that is it decreasesrapidly so far as 9mm. of sample air layer and the uniform state maintains hereafter. 2) The warmth retaining property of non-woven fabric increases proportionally as the thickness increases. 3) And in the case of setting the air space, the thicker non-woven fabricis, the less the influence of air space on the warmth retaining is.

부직포의 열적 특성에 관한 연구

신현세 단국대학교 1991 論文集 Vol.25 No.2

부직포의 열적 특성과 보온성에 관한 연구(I) -충전밀도 변화-

신현세,김영석 한국섬유공학회 1987 한국섬유공학회지 Vol.24 No.6

This study was performed to investigate the thermal and the warmth retaining properties of non-woven fabrics by comparing it with changing factor of packing density. The results are summarized as follows. 1. There is a great deal a difference between the temperature of heat plate and that of high temperature surface of non-woven fabric. And then, it is more desirable to apply the temperature of high-temperature surface of non-woven fabric than that of heat plate to compute the thermal conductivity. 2. The thermal conductivity of non-woven fabric diminish little by little as packing density increases, but after the limit packing density, pc=0.02g/㎤, the thermal conductivity is almost definitely maintained. 3. The warmth retaining property of non-woven fabric increases as packing density increases, but after the limit packing density, the thermal resistance is almost definitely maintained.

Polypropylene/nylon 6블렌드 필라멘트의 물리적 특성에 관한연구

신현세,한승산,이태균 한국섬유공학회 2002 한국섬유공학회지 Vol.39 No.2

Polypropylene(PP) and nylon 6 were extruded on a single screw extruder. Nylon 6 could disperse in an ellipsoidal form in the PP matrix. When the blends were compression-molded at a temperature between the melting temperature of PP and that of nylon 6, these ellipsoids were ma ntained in the matrix. While the elastic recovery was improved by the existence of nylon 6 ellipsoids, the tensile strength of the blend decreased. Differential scanning calorimetry(DSC) analysis showed that nylon 6 ellipsoids could affect the crystallization behavior of PP slightly. To see if the above results could also be obtained in PP/nylon 6 blend filaments, the mechanical properties, the morphology, and the melting and crystallization of the blend filaments were investigated in this study.

직연신 방사과정에서의 폴리프로필렌 구조해석 : 분자량 및 권취속도에 따른 영향 Effect of Molecular Weight and Take-up Velocity

신현세,이태균 단국대학교 1998 論文集 Vol.33 No.-

Abstrack : The development of the structure of polypropylene fibers during the direct drawing melt spinning process was analyzed by comparing fibers which have gone through the whole direct drawing melt spinning process and fibers in which the drawing step was omitted. The relative contribution of the drawing step was evaluated so that the information on the stages of development of the structure can be utilized as the foundation for future research on functional or high performance fibers. Four different molecular weights and take­up speeds were utilized to study the effect of these variables on the development of the structure. The samples taken up omitting the drawing step were designated as undrawn fibers and the fibers in which the drawing was carried out as drawn fibers. When the properties of the drawn fibers were taken as reference and the degree of structure formation in the undrawn fibers described by the percentage therof, 99, 85 and 95% of the density crystallinity and crystalline orientation had already developed prior to the drawing step. In the other hand the overall orientation was found to be more dependent on the drawing process, with about 64-73% of the orientation being developed in the drawing step and 26.8-36.1% being developed prior to the drawing step. The amorphous orientation of the undrawn fibers exhibited a negative value suggesting that the rotation of lamella to the final structure occurs in the drawing step. The highest tenacity obtained in this experiment was 4.5g/den and the highest modulus 25.4g/den when PP of Mn=230,000 was spun at 800m/min.

폴리프로필렌 멀티 필라멘트의 연신공정에 따른 구조해석

신현세 檀國大學校 出版部 1999 論文集 Vol.34 No.3

落線紡積에서 Tensor Gauer가 系의 品質에 미치는 影響

申鉉世 慶北工業專門大學 1978 論文集 Vol.15 No.-

In order to investigate the effect of the tensor gauge of the spining frame on the quality of spun yarn, the types of yarn are utilized waste cotton yarn and polyester strips (cotton) Hended yarn. The results are as follows. 1) The tensor gauge was effected strongly to the irregularity of spun yarn with all goods and this increased u% as that increasing. 2) The tensor gauge has to maintain beyond 4m/m at Least and the increasing u% was bad for 'its' property strongly in case of beyond 6.5m/m. 3) The IPI value was increased as tensor gauge sameness the Irregularity. 4) The single yarn strength according to the tensor gauge was not seen the increasing and decreasing.

하여不織布의 熱的 特性에 관한 硏究 : 風速, 두께 및 密度變化에 대

申鉉世 檀國大學校 出版部 1991 論文集 Vol.25 No.2