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견의 황변억제에 관한 연구 : 메탄올 및 희박염산처리에 의한 견피브로인의 내부구조전이가 황변억제에 미치는 영향
장정대 한국의류산업학회 2002 한국의류산업학회지 Vol.4 No.2
Degummed silk from Bombyx mori was dissolved in 9.3M lithium bromide solution. The regenerated silk fibroin films were completely a-randomcoil type as shown by x-ray diffraction and infrared spectroscopy. The structural changes in silk fibroin induced by immersion into methanol and dilute hydrochloric acid and its photo-yellowing effect was studied. The changes of crystallinity were measured by infrared spectrometer. Yellowness index caused by ultraviolet irradiation were observed as a function of the structural change on silk fibroin. On treatment with methanol, α-randomcoil silk film is converted to the β-form structure. After the treatment of hydrochloric acid on β-form structure in silk induced by immersion into methanol, β-form in silk fibroin is partially decreased. Crystallization owing to β-form transition reduced the initial yellowness index by ultrviolet irradiation. A little β-form structure in silk fibroin increased the initial yellowness in comparision with more β-form structure.
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저온 및 고온에서 Poly(ethylene Terephthalate)섬유의 연신이 미세구조에 미치는 영향(Ⅰ)
張貞戴 부산여자대학 1989 釜山女子專門大學 論文集 Vol.11 No.-
In this study, polyester filaments were drawn at 50 and 2000C at four different draw ratios(2.5, 3.0, 4.0, 5.0) Cristallinity, crystallite size, degree of Orientation were investigated using X - ray diffraction, Intrared spectroscopy, birefringence. the densities were determined using the floatation technique. the f10wing results were obtained ; (1) As the draw ratio increases, the crystallinity, density and degree of orientation also increase. Because drawing induces alignment of chain segments in the Crystalline region and crystalliza-‘ - m (2) crystallinity and degree of orientation are higher for the drawn fiber at high drawing temperature, having the same draw ratio thermomechanical process at high drawing temperature induces crystallization by rotation and alignment of chain along the direction of the fiber axis. (3) the crystallite size increases according to higher drawing temperature and draw ratio, Though the mode of structural deformation at low and high temperature is different.
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張貞戴 부산여자대학 1991 釜山女子專門大學 論文集 Vol.13 No.-
Mechenical properties of sewing thread by high speed sewing machine with many kinds of fabric and sewing thread were investigated. Transition of tensile properties on sewing thread were discussed. Tensile strength of sewing thread by high speed sewing procss were decreased. spun sewing thread is more great than filament on rate of strength decrease. More elongation of sewing thread have less loss of tensile strength, poor elongation of sewing thread have more loss of tensile strength. Seam puckering is due to elongation of sewing thread. Sewability of core spun thread is excellent. The more weight of fabric has on the same kind of fabric, the more loss of strenght mcrease.
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天然染料에 관한 硏究(6)-치자색소에 의한 셀룰로오즈섬유의 염색
趙慶來,張貞戴 新羅大學校 1993 論文集 Vol.36 No.1
Optical behaviors and dyeing properties of color solution extracted from Cape Jasmin were investigated. The wavelength of maximum absorption of color solution differed with solvent. The amount of colors extracted was increased with extracting time. but does not concerned extracting temperature. Dye content of fibers was related to concentration of the dye in solution and dyeing time. The value of apparent diffusion coefficients(Da) increased and the value of standard affinities of dyeing(-△u°)decreased with increasing dyeing temperature. respectively. The standard heats of dyeing (△H°), variation of entropy(△S°)and activation energy(Eact) were calculated to be -3.698kcal/mol. -9.0225cal/mol·deg and 1.781kcal/mol, respectively.
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복합섬유의 고속방사에 있어서 섬유구조형성(Ⅱ) : LLDPE/PET 복합의 효과 Effects of LLDPE/PET Bicomponent System
김경효,조현혹,장정대 釜山大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.53 No.-
sheath-core형 복합섬유를 고속용융방사하여 방사속도에 따른 섬유구조의 변화를 검토하였다. 복합섬유는 폴리에틸렌테레프탈레이트(PET) 및 2종류의 선상 저밀도폴리에틸렌(LLDPE), 즉 융체유동속도(MFR)가 45, 50인 것을 사용하여 LLDPE를 sheath에 PET를 core에 배치하였다 고속방사된 복합섬유중의 각 성분의 구조형성을 복굴절, 광각X선회절 및 열분석 등으로 검토한 결과, PET성분을 단독으로 고속방사한 경우에 비해 LLDPE의 MFR에 상관없이 LLDPE/PET 복합섬유중의 PET성분은 약 1km/min 낮은 방사속도에서 배향결정화가 일어나 PET성분의 섬유구조형성은 촉진되었으며, LLDPE성분의 섬유구조형성은 LLDPE 단독으로 방사한 경우에 비해 억제됨을 확인하였다. High-speed melt spinning of sheath-core type bicomponent fibers was performed and the change of fiber structure with increasing take-up velocity was investigated. Three kinds of polymers, poly(ethylene terephthalate) (PET), linear low-density polyethylene(MFR=45) (LLDPE(45)) and linear low-density polyethylene(MFR=50) (LLDPE(50)), were selected and two sets sheath/core combinations, LLDPE(45)/PET and LLDPE(50)/PET(i.e. sheath/core), were studied. The structure of each component in high-speed spun bicomponent fibers was analyzed through the birefringence, wide-angle X-ray diffraction measurements and DSC thermogram measurements. The development of molecular orientation and the initiating of the orientation-induced crystallization of PET in LLDPE/PET bicomponent fibers occurred at lower take-up velocities regardless of the type of LLDPE as compared to those in the single component spinning. The fiber structure formation of LLDPE component in LLDPE/PET bicomponent fibers was suppressed as compared to that in the single component spinning.
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폴리에스테르 필라멘트 재봉사의 왁스 부착량이 가봉성에 미치는 영향
장정대,최석철 한국섬유공학회 1997 한국섬유공학회지 Vol.34 No.12
Polyester filament sewing thread was treated with wax. The sewability was evaluated from the maximum speed of the sewing machine, with which the T/C woven fabric could be sewn over four meters long without thread breakage. The frictional coefficient measured by Capstan method. The frictional coefficient depended on the wax content, the frictional speed, and the temperature of frictional body. It decreased abruptly in the 0~0.3% range of the wax content, and kept the increasing according to the wax content increment. The sewability was improved very much in the 0~0.3% range, and kept the highest level at 1.3% of the wax content. It was suppressed with the excessive wax content.
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장정대 부산여자대학 1986 釜山女子專門大學 論文集 Vol.8 No.-
Inorder to understand the relation between skill index and productivity in garment manufacturing. Number of production, number of feed back, number of defective goods in sewing process were investigated for 10 days in two lines with different skill index, and the amount of production, and added value were Calculated. The Conclusion obtained from this study was as follow. An added value per worker in more skillful line has 4190won ofter reduction of his pay in a day. According to this result, It is more profitable that manager empoly the skilled worker
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