• Title, Summary, Keyword: modified polyethylene terephthalate(PET)

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Measurement of Nanofilament-fabric Optical Properties (나노필라멘트 직물의 광학특성 측정에 관한 연구)

  • Lee, Nu Ri;Min, Mun Hong;Kim, Han Seong
    • Textile Science and Engineering
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    • v.52 no.5
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    • pp.325-330
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    • 2015
  • This study examined the optical properties of nanofilament fabrics prepared from polyethylene terephthalate (PET)/modified-PET sea-island bicomponent fibers using an alkali treatment. The luster and anti-transparency properties of the fabrics before and after the alkali treatment were compared. The illuminance of the alkali-treated fabric relative to the position of an illuminometer was higher than that of untreated fabric, except for an illumination angle of approximately $270^{\circ}$, where much of the light was transmitted through the pores created by the removal of the sea materials. In addition, the alkali-treated fabric exhibited superior anti-transparency properties compared to the untreated fabric. Therefore, the outstanding optical performance of nanofilament fabrics was confirmed.

Weight-reduction and Dyeing Properties of Split-type Polyethylene Terephthalate Flocking Microfibers (플록 가공용 분할형 PET 극세 플록 섬유의 감량 및 염색 특성)

  • Nam, Chang Woo;Lee, Jung Jin
    • Textile Science and Engineering
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    • v.56 no.1
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    • pp.1-7
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    • 2019
  • In conventional manufacturing of flocking fabric, filament fibers are weigh-treduced, dyed, and cut to staple fibers of a certain length. Subsequently, these short flocking fibers, or piles, are flocked on a substrate. However, many weight-reduced and dyed flocking fibers are discarded because of inaccurate length during the cutting process. To overcome this inefficiency problem, a modified flocking process was proposed, in which the filament fibers are cut before the flocking fibers are weight-reduced, dyed, and flocked. In this study, the weight-reduction behavior and dyeing properties of split-type PET flocking microfibers produced by the modified flocking process were investigated. It was found that the weight-reduction ratio of the flocking fibers depends on temperature, time, and the concentration of sodium hydroxide solution used in the alkali treatment. The optimum treatment conditions (whereby the weight-reduction ratio reached a theoretically defined value) could be chosen, and the split flocking microfibers could be monitored by scanning electron microscopy (SEM) analysis. When the flocking microfibers were dyed with seven disperse dyes, the adsorption or dyeing rates of the low- and medium-energy-type disperse dyes were faster than those of the high-energy-type disperse dyes. The high-energy-type disperse dyes exhibited good color yield, which suggested that their build-up properties were good. The wash fastness was moderate to good, and the light fastness was fair to moderate; however, the rubbing fastness was very poor.

Optimization of polymer substrate's surface treatment for improvement of transparent conducting oxide thin film (투명전도막의 특성향상을 위한 기판 표면처리법의 최적화)

  • Choi, Woo-Jin;Kim, Ji-Hoon;Jung, Ki-Young;Darma, Jessie;Choo, Young-Bae;Sung, Youl-Moon;Kwak, Dong-Joo
    • Proceedings of the KIEE Conference
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    • pp.1425_1426
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    • 2009
  • In this study, commercially available polyethylene terephthalate(PET), which is widely used as a substrate of flexible electronic devices, was modified by dielectric barrier discharge(DBD) method in an air condition at atmospheric pressure, and aluminium - doped zinc oxide (ZnO:Al) transparent conducting film was deposited on PET substrate by r. f. magnetron sputtering method. Surface analysis and characterization of the plasma-treated PET substrate was carried out using contact angle measurements, X-ray Photoelectron Spectroscopy(XPS) and Atomic Force Microscopy (AFM). Especially the effect of surface state of PET substrate on some important properties of ZnO:Al transparent conducting film such as electrical and morphological properties and deposition rate of the film, was studied experimentally. The results showed that the contact angle of water on PET film was reduced significantly from $62^{\circ}$ to $43^{\circ}$ by DBD surface treatment at 20 min. of treatment time. The plasma treatment also improved the deposition rate and electrical properties. The deposition rate was increased almost linearly with surface treatment time. The lowest electrical resistivity as low as $4.97{\times}10^{-3}[\Omega-cm]$ and the highest deposition rate of 234[${\AA}m$/min] were obtained in ZnO:Al film with surface treatment time of 5min. and 20min., respectively.

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Comparative Quality Evaluation of King Oyster Mushroom as Affected by Unit Packaging Method during Simulated Export Shipment (큰느타리버섯의 모의 수출운송과정에서 소포장 적용에 따른 품질변화 비교)

  • Woo, Seong-Min;Park, Youn-Moon;Park, Se Won
    • Horticultural Science & Technology
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    • v.31 no.2
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    • pp.186-193
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    • 2013
  • Potential of consumer unit packaging was investigated for quality maintenance during export simulation in king oyster mushrooms (Pleurotus eryngii). Mushrooms were harvested in late May, precooled to $4^{\circ}C$ within 6 hours, and then packaged for shipping in two ways: 2 kg bulk packaging in a polyethylene (PE) bag or three types of unit packaging methods such as 400 g in polypropylene film bag (PPB), 200 g on styrofoam tray + PE shrinkage film wrapping (STW), and 200 g in polyethylene terephthalate (PET) containers (PETC). For local distribution of bulk-packaged commodity, mushrooms were sorted again and packaged into 3 consumer units in the same way as for the initial shipping packages. Simulation of refrigerated container shipping was performed in a walk-in type pilot storage at $0.5^{\circ}C$ for 5 weeks, while local marketing simulation was carried out on the shelf at $7^{\circ}C$ for 7 days. During the shipment simulation, creation of modified atmosphere (MA) was substantial in 2 kg bulk packages with low $O_2$ below 2% and high $CO_2$ over 15% whereas, in PPB and PETC unit packages, relatively higher $O_2$ concentrations were observed. On the shelf at $7^{\circ}C$, $CO_2$ concentrations rapidly increased in PPB and PETC packages despite the short marketing period. Overall marketability evaluated by off-flavor, browning, and texture rating was maintained at excellent level when 2 kg bulk packaging in PE or unit packaging in PPB and PETC were used for shipment. In contrast, establishment of MA was very slight in STW packages during shipment and local distribution resulting in poor quality after export simulation. The results suggested that shipment using adequate consumer unit packaging is more practical and economically beneficial than using bulk packaging in the export program consisting of 5-week shipment and 7-day local distribution.