• Title, Summary, Keyword: LDPE film

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Storage Period of Milled Rice by Packaging Materials and Storage Temperature (온도와 포장재에 따른 백미의 저장가능기간)

  • Choi Yoon-Hee;Choung Jin-Il;Cheong Young-Keun;Kim Young-Doo;Ha Ki-Yong;Ko Jae-Kwon;Kim Chung-Kon
    • Korean Journal of Food Preservation
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    • v.12 no.4
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    • pp.310-316
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    • 2005
  • This study was carried out to investigate the quality characteristics by packaging materials and storage temperature to predict safe storage period for milled rice. Mechanical taste value and whiteness of milled rices stored at room temperature were severely decreased than those of the stored at low temperature, but fat acidity and b value of those at room temperature was rapidly increased than those of stored at low temperature. Milled rice packed in LDPE film bag were smelled stale flavor after 4 months storage at room temperature, Hojinbyeo was not produced flour in the rice grain surface but Dongjinbyeo was showed production of flour. pH of milled rice of Dongjinbyeo and Hojinbyeo packed in LDPE film bag were the lowest showing 5.3 and 5.6, respectively after 6 months at mom temperature. Safe storage period of Dongjinbyeo and Hojinbyeo packed in craft paper bag were 1 month at room temperature, those of packed in LDPE film bag were 2 months. At low temperature safe storage period of Dongjinbyeo and Hojinbyeo packed in craft paper bag were 2 months, those of packed in LDPE film bag were 5 and 4 months, respectively.

Surface Characteristics of LDPE Film by Corona Discharge treatment and Its Aging Effect (코로나 방전에 의한 LDPE 필름의 표면특성과 경시효과)

  • 박수진;신준식;김학용;이덕래
    • Textile Science and Engineering
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    • v.39 no.5
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    • pp.568-574
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    • 2002
  • The effect of corona discharge on low-density polyethylene (LDPE) film was studied in terms of surface functionality and surface energetics of the film surface. Acrylic acid grafting on the corona-treated LDPE surfaces was also carried out to improve the stability of surface functional groups. The introduction of polar groups on LDPE film by corona discharge was confirmed by FT-IR and XPS analyses. Contact angle measurements were made to analyze the surface free energy of the LDPE film. The corona treatment of film led to a decrease in contact angles mainly due to increase in its specific (or polar) component, resulting in increased total surface free energy. It was found that acrylic acid grafting on the corona treated film was a suitable method to obtain a film surface with stable polar group, because water contact angle did not significantly increase upon prolonged aging time.

Effect of Carbon Dioxide Adsorption on LDPE/Zeolite 4A Composite Film

  • Jung, Bich Nam;Shim, Jin Kie;Hwang, Sung Wook
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.24 no.3
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    • pp.149-157
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    • 2018
  • Low density polyethylene (LDPE) has been researched in many industrial applications, and LDPE/zeolite 4A composites has been extensively studied for many applications such as microporous, breathable film and so on. LDPE/zeolite composite have a great potential for carbon dioxide adsorption film due to its high adsorption ability. In this study, LDPE/zeolite 4A composites with various contents were prepared by melt mixing process, and co-extrusion process was applied to develop a $CO_2$ adsorption conventional film and foamed film. The thermal, rheological, mechanical, physical and morphological properties of composite films has been characterized, and $CO_2$ adsorption of the composite films evaluated by thermogravimetric analysis (TGA) and the performance was found to be about 18 cc/g at 30.9 wt% of the zeolite content.

Effect of Ozone Treatment on Dyeability of Polyethylene Film (오존 처리가 폴리에틸렌 필름의 염색성에 미치는 영향)

  • 박수진;신준식;김학용;이덕래
    • Polymer Korea
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    • v.27 no.2
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    • pp.98-105
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    • 2003
  • The surface energy and the effect of functional groups on the surface of the ozone-treated low-density polyethylene (LDPE) film were studied. Treatment conditions were treatment time, total amount of transferred ozone, and ozone concentration. The introduction of polar groups on the surface of LDPE film after ozone treatment was confirmed by FTIR-ATR and XPS analyses. Surface fee energy of the LDPE film was examined by a contact angle method. The ozone treated-LDPE film showed a decreased water contact angles about 15$^{\circ}$ mainly due to the increased concentration of oxygen-containing functional groups, which was attributed to the increased surface free energy or $O_{IS}/C_{IS}$Also, the concentrations of the oxygen-containing functional groups on the surface of LDPE film increased with ozone treatment time and concentration, whereas no significant effects were found for the total amount of transferred ozone. From the dyeability test using Kubelka-Munk equation, it was found that the ozone treatment plays an important role in the growth of oxygen-containing functional groups of LDPE film, resulting in the improvement of dyeability for basic dyeing agent.

Effects of Packing Materials, tight Condition and Storage Temperature on MAP Storage of Chicon (MAP저장시 포장재 종류, 광의 유무, 및 저장온도가 치콘 저장성에 미치는 영향)

  • Bae Jong Hyang;Park Kuen Woo;Kang Ho-Min
    • Protected Horticulture and Plant Factory
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    • v.14 no.2
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    • pp.69-75
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    • 2005
  • The storability of chicon was compared by packing it with PE box, wrap, LDPE (low density polyethylene) film that was 25 and 50um thickness, respectively and storing at 1 and $10^{\circ}C$ under light and dark conditions. The visual quality depending on dehydration was deteriorated at more than $2\%$ weight loss during storage. In packing treatments, chicon packed with PE box lost fresh weight to $3\%\;at\;10^{\circ}C\;and\;2\%\;at\;1^{\circ}C$, while non- penetrated film treatment, wrap, 25 and 50um thickness LDPE film, showed less than $1\%$ weight loss. The carbon dioxide concentration in package was $3\~4\%\;in\;50{\mu}m$ LDPE film at $1^{\circ}C\; and\;25um$ LDPE film at $10^{\circ}C$. The ethylene concentration in 50um LDPE film at $1^{\circ}C\;and\;25{\mu}m$ LDPE film at $10^{\circ}C$ was approximately 0.3 ppm and 0.5 ppm, respectively. Chiton stored in dark condition didn't turn to green, but it fumed green only in 3 days at $10^{\circ}C$ and in 6 days at $1^{\circ}C$ under light condition. The greening of chicon was less, the packing materials was thicker. The chlorophyll content represented the degree of greening showed less at $1^{\circ}C$ then at $10^{\circ}C$. The coefficient of correlation(r) between chlorophyll content and carbon dioxide concentration in package was 0.926 at $1^{\circ}C$ and 0.997 at $10^{\circ}C$. The visual quality except greening of packed chicon was maintained at $1^{\circ}C$ better than $10^{\circ}C$, and it was shown highest grade packed with $50{\mu}m$ LDPE film at $1^{\circ}C$ and packed with 25um LDPE film at $10^{\circ}C$. The vitamin C content in packed chicon was kept higher at $1^{\circ}C$ on storage temperatures, and 25um and 50um LDPE film on packing materials. According to these results, it can be proper condition for storage and marketing of chicon that 50um LDPE film at $1^{\circ}C$ and 25um LDPE film at $10^{\circ}C$. And dark condition is necessary to store chicon because it should turn green under tiny light condition.

Sorption Characteristics of Binary Mixture of Corn Starch- Soy Protein Isolates in Plastic film Packaging (Plastic필름 포장에 따른 옥수수 전분과 분리 대두단백질의 이성분 혼합물의 흡습특성)

  • Kim, Duck-Woong;Woo, Sang-Gyu
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.17 no.3
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    • pp.191-197
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    • 1988
  • Sorption properties of corn starch(CS) and Soy protein isolates(SPI) in plastic films packaging were investigates for binary system. The mixture were sealed in plastic films of low density polyethylene(LDPE), oriented polypropylene(OPP) and LDPE/OPP coated film and packaging effect on the changes of moisture sorption during storage at $40^{\circ}C$ were studied. The following results were obtained. The water vapor permeability of material films was $32.6g/m^2/24hrs(below\;g)$ for 0.02mm LDPE film, 14.01g for 0.04mm LDPE film, 7.30g for 0.02mm OPP film, 3.37g for 0.04mm OPP film and 4.869 for 0.02mm LDPE/0.02 mm OPP confine film at $40^{\cire}C$ 90%RH, therefore the OPP film was more effective than LDPE film on the resistance of relative humidity. And the OPP film packaging sealed mixture of food samples was also more elective then LDPE film, having same thickness for increase of water vapor permeability during storage at $40^{\cire}C$. A general increase in sorption rate was found more in SPI than CS in the packaged mixtures.

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Rheological Properties and Film Fabrication of LLDPE/LDPE Blends (LLDPE/LDPE 혼합물의 유변 물성과 필름 제조)

  • 오장훈
    • The Korean Journal of Rheology
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    • v.7 no.3
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    • pp.173-180
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    • 1995
  • LLDPE/LDPE 혼합물의 유변 물성과 필름가공특성 필름 물성 및 LLDPE의 extrudate 표면상태를 살펴보았다. LLDPE에 LDPE를 혼합함으로써 용융 강도가 크게 향상 되는 것을 볼수 있었으며 혼합비에 따라 필름의 기계적 물성이 변화하는 것을 볼수 있었다. 즉 최고의 물성을 나타내는 적절한 혼합비율이 존재하였다. 본논문에 사용된 LLDPE/LDPE 혼합물에 있어서는 LDPE의 함량이 15∼30wt%일 때 가장 우수한 기계적 물성을 얻을수 있 었다. LLDPE 필름의 표면 불량 문제를 보기위하여 capillary를 이용하여 LLDPE extrudate 의 표면 튀틀림(distortion)의 진행순서를 살펴본 결과, 전단 응력이 0.23MPa 일때 sharkskin이 발현함을 볼수 있었다.

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Effect of Surface Oxyfluorination on the Adhesive Properties of Low Density Polyethylene Film (불소 혼합가스로 처리된 LDPE 필름의 접착특성에 관한 연구)

  • 박수진;신준식;김학용;이덕래
    • Textile Science and Engineering
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    • v.40 no.2
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    • pp.189-195
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    • 2003
  • The effect of surface oxyfluorination on low-density polyethylene (LDPE) film was studied in terms of surface functionality and surface energetics of the film surface, to which improvements in adhesion can be attributed. The formation of functional groups and surface free energy were confirmed by FTIR-ATR, XPS, and contact angle method. Adhesion strength of the oxyfluorinated LDPE film was investigated by the T-peel test. The total surface free energy increased with oxyfluorination time, with a progressive increase in the polar component together with a small decrease in the dispersive component of surface free energy. Consequently, oxyfluorinated LDPE film led to increased total surface free energy mainly due to the increase in the polar component, resulting in increased adhesion to copper foil. It was revealed that the oxyfluorinated LDPE film played an important role in improving the adhesion. A direct linear relationship is shown between surface free energy and the adhesion strength in this work.

Wetting Properties of Biopolyester Films Prepared by Thermo-Compression Method

  • Rhim, Jong-Whan;Hong, Seok-In
    • Food Science and Biotechnology
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    • v.16 no.2
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    • pp.234-237
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    • 2007
  • Water resistance of three biopolyester films, such as poly-L-lactate (PLA), poly-hydroxybutyrate-co-valerate (PHBV), and Ecoflex, and low density polyethylene (LDPE) film was investigated by measuring contact angle of various probe liquids on the films. The properties measured were initial contact angle of water, dynamic change of the water contact angle with time, and the critical surface energy of the films. Water contact angle of the biopolyester films ($57.62-68.76^{\circ}$) was lower than that of LDPE film ($85.19^{\circ}$) indicating biopolyester films are less hydrophobic. The result of dynamic change of water contact angle also showed that the biopolyester films are less water resistant than LDPE film, but much more water resistant than cellulose-based packaging materials. Apparent critical surface energy for the biopolyester films (35.15-38.55 mN/m) was higher than that of LDPE film (28.59 mN/m) indicating LDPE film is more hydrophobic.

Characteristics of LDPE resin film depending on RP contents (적인 함유량에 따른 LDPE 수지 film의 특성연구)

  • JO, Dong-Soo;Noh, Young-Tai;Park, Byung-Sun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.10
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    • pp.6655-6665
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    • 2015
  • Due to tightened environmental regulations on halogen type flame retardants, the portions of those based on phosphorous compounds that are non-halogen type is rising. When producing functional film, the physical and thermal properties become distinctly different depending on the amount of Red-phosphorus(RP) addition which causes flame resistance. The physical properties of resin fall in big scale when too much flame retardants are added, and it is hard to be applied to functional films such as shrink or anticorrosive film. The purpose of this research is to study the effects on mechanical, physical, and other properties of RP-LDPE films by changing the RP-MB contents. The LDPE film used for this study was produced through blow-type injection molding. The flame resistance was VTM-0, and the tear resistance showed inverse trends of MD and TD. Contraction percentage showed no relationship with the amount of RP content, but the anti-corrosive property showed 0.05 % better result than the national anti-corrosion shrink film reliability standard.