• Title/Summary/Keyword: Polyolefin

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Predicting and Extending the Shelf Life of Red Cabbage Sprouts (적양배추싹의 Shelf Life 예측 및 Aqueous ClO2, Fumaric Acid, UV-C 병합처리)

  • Chun, Ho Hyun;Park, Seung Jong;Jung, Seung Hun;Song, Kyung Bin
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.42 no.9
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    • pp.1518-1523
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    • 2013
  • To estimate the shelf life of red cabbage sprouts (stored at 4 and $10^{\circ}C$), the numbers of total aerobic bacteria were determined during storage. Parameters for the Gompertz model were determined and the shelf life was predicted using a modified Gompertz equation. The estimated shelf lives of red cabbage sprouts packed with polyolefin film and polyamide/polyamide/polyethylene (PA/PA/PE) film at $4^{\circ}C$ were 49.4 and 52.3 h, respectively, whereas those of red cabbage sprouts packed with polyolefin film and PA/PA/PE film at $10^{\circ}C$ were 19.7 and 22.6, respectively. The shelf life prediction equation was appropriate, based on the statistical analysis of the accuracy factor, bias factor, and mean square error. On the other hand, for red cabbage sprouts treated with aqueous $ClO_2$/fumaric acid and UV-C then packed with polyolefin film or PA/PA/PE film, the shelf life was predicted to be longer than 168 h. These results suggest that the combined treatment of aqueous $ClO_2$/fumaric acid and UV-C can be useful for improving microbial safety and extending the shelf life of red cabbage sprouts during storage.

Characterization of Polyolefin Bumper Recycled by Chemical Removal Method using Electronic Speckle Pattern Interferometry (화학적 박리방법과 ESPI에 의한 재생된 폴리올레핀 범퍼수지의 물성평가)

  • 김현경;강기수;김경석;홍진후
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.295-298
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    • 1997
  • Recycl ing of PP/EPR based bumper coated with polyester urethane paint has been per formed by chemical decoating method. Electronic Speckle Pattern Interferometry (ESP11 has been applied to characterize the deformation of polyolef in based bumper. In additon, physical properties and processability of recycled materials have been investigated by dynamic mechanical thermal analysis, impact test and melt flower index measurement. The results show that the deformation ratio of recycled material is higher than that of virgin one. The morphological change of EPR, degree of distribution and dispersion during the recycling process seem to be the most important factor for the deformation and the mechanical properties of recycled materials. The experimental results obtained show that ESPI is very powerful technique to study the thermal mechanical property of polyolefin bumper system.

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Flexural Performance and Fire Resistance of Polyolefin Based Structural Synthetic Fiber Reinforced Concrete (폴리올레핀계 구조용 합성섬유보강 콘크리트의 휨성능 및 화재 저항성)

  • Park, Chan-Gi;Won, Jong-Pil
    • Journal of The Korean Society of Agricultural Engineers
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    • v.50 no.1
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    • pp.49-57
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    • 2008
  • This study evaluated the flexural properties and fire resistance of polyolefm based structural synthetic fiber reinforced concrete. The effects of differing fiber length, dimension and fiber volume fraction were studied. Flexural and fire resistance test were conducted in accordance with the JCI SF-4 and RABT time heating temperature curve, respectively. The Flexural test results indicated that the polyolefln based structural fiber reinforcement showed an ability to increase the flexural toughness and good fire resistance significantly(as compared to steel fiber reinforcement).

Synthesis of Super Hydrophobic Orange Dyes Having Maximum Absorption at 450-500nm for Pure Polyolefin Fibers (450-500nm의 최대흡수를 가지는 순수 폴리올레핀 소재용 초소수성 오렌지 염료의 합성)

  • Kim, Taekyeong;Ryu, Myeonghwa
    • Textile Coloration and Finishing
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    • v.26 no.3
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    • pp.165-172
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    • 2014
  • Novel super hydrophobic orange dyes having maximum absorption band at 450-500nm were synthesized to dye polyolefin fibers such as polypropylene and ultra high molecular weight polyethylene fibers, using 4-alkylanilines and ${\beta}$-naphthol. Their absorption spectra at visible range showed almost the same, which meant that the alkyl substituents introduced to chromophore did not affect on color appearance of the dyes. Considering both color strength and wash fastness, the decyl-substituted dye was determined as the optimum one practically. From the dyeing results at various conditions, the optimum dyeing was $130^{\circ}C$ for 1 hour with 5% owf of dyes. The good fastness ratings to washing, rubbing were obtained showing 4-5 for both fibers. Light fastness was also acceptable giving rating 3-4 for polypropylene fibers and rating 3 for ultra high molecular weight polyethylene fibers.