• 제목/요약/키워드: polyethylene film

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Improvement of Moisture Resistance of Aqueous Slip-Resistant Adhesive on the Polyethylene Film (폴리에틸렌 필름에서의 수용성 미끄럼 방지 접착제의 내습 특성 개선)

  • Yoon, Young Ki;Cho, Kuk Young;Seol, Wan Ho
    • Korean Chemical Engineering Research
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    • v.48 no.2
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    • pp.193-197
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    • 2010
  • Stretch wrapping processes that are used to the packaging process had a serious problem of high price and treatment of used wraps. On the other hand, slip-resistant adhesive provides the advantage of simple process, low cost, and free from after-use treatment. In this research, adhesion deterioration of aqueous slip-resistant adhesive adhered to polyethylene film under the moisture condition using aqueous slip-resistant adhesive was observed by the Peel Test. Improvement of adhesive property under the moisturizing condition could be obtained by the selection of appropriate additives. As a result, introduction of maltodextrin reduced the deterioration of slip-resistant adhesion owing to the improved moisture resistance and introduction amount of 10 wt% of maltodextrin showed optimal performance.

Effect of Permeability-Controlled Polyethylene Film on Extension of Shelf-life of Brined Baechu Cabbage (투과도 조절 폴리에틸렌 필름의 절임배추 보존기간 연장효과)

  • Kim, Young-Wook;Jeong, Ji-Kang;Lee, Sun-Mi;Kang, Soon-Ah;Lee, Dong-Sun;Kim, So-Hee;Park, Kun-Young
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.38 no.12
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    • pp.1767-1772
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    • 2009
  • Brined Baechu cabbages were packed with different films of high density polyethylene (HDPE), aluminium polyethylene (Al/PE), nylon polyamide (Ny/PE), low density polyethylene (LDPE) and permeability-controlled polyethylene (Mirafresh (MF), US patent No. 5972815), and then stored at 4${^{\circ}C}$ for 4 weeks. Changes in quality characteristics of pH, acidity, total bacteria counts, lactic acid bacteria counts, E. coli counts, texture and $O_2$ concentration were determined during the storage. The pH of brined Baechu cabbage packed with Mirafresh (MF) film was 6.25 after 4 weeks from initial pH of 6.80. The acidity of all brined Baechu cabbages increased, however, the increase of the cabbage in MF was the lowest. The levels of total bacteria, lactic acid bacteria and E. coli in the cabbages packed with MF were also lower than the other films. After 4 weeks, of all brined springiness Baechu cabbages decreased, but MF showed relatively high springiness. The $O_2$ concentrations by its permeation through MF were 0.35%-1.00% at 4-25${^{\circ}C}$ after 1 week. In conclusion, MF was found to be the most effective packaging film for brined Baechu cabbage to extend shelf-life.

FTIR study of gamma and electron irradiated high-density polyethylene for high dose measurements

  • Al-Ghamdi, Hanan;Farah, Khaled;Almuqrin, Aljawharah;Hosni, Faouzi
    • Nuclear Engineering and Technology
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    • v.54 no.1
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    • pp.255-261
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    • 2022
  • A reliable and well-characterized dosimetry system which is traceable to the international measurement system, is the key element to quality assurance in radiation processing with cobalt-60 gamma rays, X-rays, and electron beam. This is specifically the case for health-regulated processes, such as the radiation sterilization of single use medical devices and food irradiation for preservation and disinfestation. Polyethylene is considered to possess a lot of interesting dosimetric characteristics. In this work, a detailed study has been performed to determine the dosimetric characteristics of a commercialized high-density polyethylene (HDPE) film using Fourier transformed infrared spectrometry (FTIR). Correlations have been established between the absorbed dose and radiation induced infrared absorption in polyethylene having a maximum at 965 cm-1 (transvinylene band) and 1716 cm-1 (ketone-carbonyl band). We have found that polyethylene dose-response is linear with dose for both bands up to1000 kGy. For transvinylene band, the dose-response is more sensitive if irradiations are made in helium. While, for ketone-carbonyl band, the dose-response is more sensitive when irradiations are carried out in air. The dose-rate effect has been found to be negligible when polyethylene samples are irradiated with electron beam high dose rates. The irradiated polyethylene is relatively stable for several weeks after irradiation.

Studies on the Rancidity of Pacific Saury, Cololabis saira Kwamaegi on the Storage Temperatures and Durations (저장온도와 저장기간에 따른 꽁치과메기의 산패도)

  • Lee, Ho-Jin;Oh, Seung-Hee;Jeong, Ji-Suk;Choi, Kyoung-Ho
    • The Korean Journal of Food And Nutrition
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    • v.21 no.4
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    • pp.477-484
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    • 2008
  • The Pacific saury, Cololabis saira Kwamaegi, is a traditional local food of the Eastern sea area, centered around Pohang. It is well-recognized as being both tasty and nutritious. Nevertheless, bacterial contamination, excessive dryness, and compositional changes render this fish edible only during the winter months. Thus, to improve its storage capabilities, this study assessed the effects of storage material, type, temperature, and duration on compositional changes in Kwamaegi. The assessed samples were Kwamaegi which had been naturally dried for 15 days. The storage materials included an A-film, a self- developed multi-film made of polyethylene, polyamide, EVOH, and polyethylene, and a B-film made of polyethylene, nylon, polyethylene, nylon, and polyethylene. The B films were utilized after pressing and lamination. The storage types included one whole fish(1G), or 2 divided fish(2G), to increase eating convenience. The 2G type was the muscle portion divided vertically after discarding the jowl, skin, and internal organs. The storage temperatures were 0, -15 and $-30^{\circ}C$, and the storage durations were 2, 4, and 6 months. Among the lipid rancidities, acid value and peroxide value showed the highest level of initial rancidity at a storage temperature of $0^{\circ}C$ for 2 months. We noted no significant differences between storage materials. The lower the storage temperatures, the less acid and peroxide were generated. Between the storage types, 1G evidenced lower less acid values than 2G. The TBA values revealed a dramatic increase at a storage temperature of $0^{\circ}C$ for 2 months, whereas this rapid progress was not observed at storage temperatures of -15 and $-30^{\circ}C$. Along with the acid value and peroxide value, the samples stored at 0, -15 and $-30^{\circ}C$ evidenced significantly lower TBA values. The B-film evidenced a slightly lower TBA value than was observed in the A-film, but no significant differences were observed.

Effect of Mulching and Soil Conditioners on Yield and Flavonoids Content of Mungbean (녹두 수량과 Flavonoids 함량에 대한 멀칭과 토양개량제 효과)

  • Kim, Dong-Kwan;Chon, Sang-Uk;Lee, Kyung-Dong;Son, Dong-Mo;Rim, Yo-Sup;Kim, Kyong-Ho
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.53 no.4
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    • pp.353-358
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    • 2008
  • The purpose of this study was to examine the effects of black polyethylene film mulching and soil conditioners on the growth, yield, and flavonoids biosynthesis of mungbeans. The seedling stand rate, plant height, and pods per plant were 98%, 61 cm, and 15.1, respectively, when the mungbean grown black polyethylene film mulches. They were greater than these results when the without mulches was applied by 13%, 9 cm, and 1.8, respectively. Mungbean grown with black polyethylene film mulches ($243\;kg{\cdot}10a^{-1}$) exhibited 38% more seed yield than without mulches ($176\;kg{\cdot}10a^{-1}$). However, no significant difference in contents of vitexin and isovitexin of mungbeans between with black polyethylene film mulches and without mulches was observed. Among soil conditioners, standard fertilizer+oil cake and standard fertilizer+mineral powders increased number of pods. The standard fertilizer+oil cake showed the highest seed yield (119%) of mungbean when it mixed with standard fertilizers, and followed by mineral powders (115%). The mixed combinations of oil cake or mineral powders also seem to have affected the biosynthesis of vitexin and isovitexin, whose content in mungbeans was significantly more.

Studies on the Oxygen Permeability and It's Proofness of the Various Commercial Polymer Films (상업용 고분자 필름의 산소투과도 및 산소투과 방지도에 관한 연구)

  • Suh, Hwan-Kyu;Kim, Joon-Soo;Lee, Jung-Keun
    • Elastomers and Composites
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    • v.15 no.1
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    • pp.3-9
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    • 1980
  • The oxygen permeability and it's proofness of te various commercial polymer films have been investigated at the constant pressure and temperature. Oxygen proofness, the reciprocals of the oxygen permeability for the various samples, were determined by means of a coulometric oxygen permeability tester. The testing of sample films was performed at constant temperature $(23{\pm}1^{\circ}C)$ under 1 atm. for 24 hours. The order of the relative proofness observed are as follows; oriented Nylon (O. Nylon)> oriented Polyester (O. PET)>nonoriented Nylon (N. Nylon)>nonoriented Polyester (N.PET)> rigid Polyvinyl chloride (Rigid PVC)>semirigid Polyvinyl chloride (Semirigid PVC)> oriented Polypropylene (O. PP)>plasticized Polyvinyl chloride (P. PVC)> casted Polypropylene (C. PP)> low density Polyethylene (LDPE)>high density Polyethylene (HDPE, Inflation)> high density-polyethylene (HDPE, T-die) The oxygen proofness of the films was increased with the polarity cf polymer, the film thickness and mechanical orientation and decreased with the addition of plasticizer in PVC. For the use of wrapping materials, one film with the polar property in the main chain of the polymer molecule and the others with nonpolar property in it are laminated for the protection from oxygen and moisture.

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Immobilization of ${\alpha}-amylase$ on Polyethylene Glycol Grafted Polyurethane Film (폴리에틸렌글리콜이 그라프트된 폴리우레탄 막에 ${\alpha}$-아밀라제의 고정화)

  • Kim, Sung-Ho;Ha, Chung-Hun
    • Journal of Pharmaceutical Investigation
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    • v.21 no.3
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    • pp.143-147
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    • 1991
  • ${\alpha}-amylase$ was immobilized on the surface of polyethylene glycol(M.W. 2000) grafted polyurethane film using diisocyanate in an attemp to develop enzyme immobilized polymeric materials. The surface morphology of the modified polyurethane film was examined by SEM. Effects of pH and temperature on the activity of the immobilized ${\alpha}-amylase$ were investigated. The optimal pH range of the activity was $7.0{\sim}7.5.$ The immobilized ${\alpha}-amylase$ demonstrated high thermal stability and maintained consistent activity during long-term storage.

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Studies on the Isolation and Identification of PEG-Degradable Strains and Physical Chracteristics of PEG-Films (PEG 분해균주의 분리, 동정 및 PEG Film 상용성에 관한 연구)

  • 이제혁;이준열;전억한
    • Microbiology and Biotechnology Letters
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    • v.22 no.3
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    • pp.316-321
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    • 1994
  • Several strains capable of degrading PEGs(Polyethylene Glycols) were isolated and investigated for their biodegradation ability of PEGs. Microorganisms screened for the biodegrada- tion studies were those grown on the PEG used as a sole carbon and energy source. It was known that the number of microorganisms decreased when grown on the high molecular weight of PEG. A biodegradation of PEG was investigated with such microorganisms in the reactor and resulted in the decrease in PEG concentration meaning that PEG was degraded in the reactor. This microorganism was identified as Flavobacterium sp. The biodegradability was found to be about 18.8% for PEG-8000 and 25.4% for PEG-10,000, respectively. For the manufacture of biodeg- radable PEG film, EMAA/PEG and EAA/PEG blending ability was investigated with IR spectrum and showed that it was possible to produce blending film.

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Effects of crystal structure on the dielectric breakdown of polyethylene thin film (PE 박막의 절연파괴특성에 미치는 결정구조의 영향)

  • 김종석;신동국;한상옥;박강식
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1996.05a
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    • pp.256-259
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    • 1996
  • In this paper, We studied polyethylene thin film to evaluate the effects of crystal structure on breakdown properties and the dielectric strength on the condition of impurity free. Bielectric strength of the finn obtained with self healing method that is able to test repeatedly on the same sample is about 3.58 MV/cm at 0.73 $\mu\textrm{m}$. The film shows outstanding crystal domain an\ulcorner crystal structure. The size of spherulites obtained reach 150-200 $\mu\textrm{m}$ in diameter.

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Effect of Biodegradable Mulch Film on Soil Microbial Community

  • Moon, Jin-Young;Song, Jae-Ki;Shin, Jung-Ho;Cho, Yong-Cho;Bae, Jin-Woo;Heo, Jae-Young;Kang, Hang-Won;Lee, Young-Han
    • Korean Journal of Soil Science and Fertilizer
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    • v.49 no.2
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    • pp.125-131
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    • 2016
  • The biodegradable film application can escape from plastic environmental pollution. This experiments studied the effect of biodegradable mulch film on the soil microbial community using fatty acid methyl ester method in soybean production field. The soil $NO_3$-N content in polyethylene mulch film (PE) soil was significantly higher than biodegradable mulch film soil (p < 0.05). The soil microbial community of Gram negative bacteria showed significantly higher in biodegradable mulch film soil than PE mulch film soil (p < 0.05). In addition, biodegradable mulch film soil had significantly low ratio of cy17:0 to $16:1{\omega}7c$ and cy19:0 to $18:1{\omega}7c$ compared with those of PE mulch film soil (p < 0.05), indicating that microbial stress decreased. The ratio of cy17:0 to $16:1{\omega}7c$ and cy19:0 to $18:1{\omega}7c$ should be considered as a potential responsible factor for the obvious differentiation that was observed between the biodegradable mulch film soil and PE mulch film soil in a upland field. The results of this experimentation show the potential of using biodegradable mulch film in place of PE.