• Title/Summary/Keyword: oriented polypropylene-film

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Oxygen Permeation Characteristics of Nano-silica Hybrid Thin Films (나노 실리카 하이브리드 박막의 산소 투과 특성)

  • Kim, Seong-Woo
    • Journal of the Korean Applied Science and Technology
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    • v.24 no.2
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    • pp.174-181
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    • 2007
  • In this study, $SiO_2/poly(ethylene-co-vinyl$ alcohol)(EVOH) hybrid coating materials with gas barrier property could be produced using sol-gel method. The biaxially oriented polypropylene (BOPP) substrate with surface pretreatment was coated with the prepared hybrid sols containing various inorganic silicate component by a spin coating method. Crystallization behavior of the hybrids was investigated in terms of analysis of X-ray diffraction and cooling thermogram from DSC experiment. From the morphological observation of the $SiO_2/EVOH$ hybrid gel, it was confirmed that there existed an optimum content of inorganic silicate precursor, Tetraethylorthosilicate (TEOS), to produce hybrid materials with dense microstructure, exhibiting uniformly dispersed silica particles with average size below 100 nm. When TEOS was added at below or above the optimum content, particle clusters with large domain were observed, resulting in phase separation. This morphological result was found to be in good agreement with that of oxygen permeability of the hybrid coated films. In the case of film coated with hybrid prepared from addition of 0.01 - 0.02mol of TEOS, a remarkable improvement in barrier property could be obtained, however, with the addition of TEOS more than 0.04 mol, the barrier property was dramatically reduced because of phase separation and micro-crack formation on the film surface.

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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Study of Pallet Scale Modified Atmosphere Packaging Films for Reducing Water Condensation

  • Kim, Jinse;Park, Jong Woo;Park, Seokho;Choi, Dong Soo;Choi, Seung Ryul;Kim, Yong Hoon;Lee, Soo Jang;Park, Chun Wan;Lee, Jung- Soo;Cho, Byoung-Kwan
    • Journal of Biosystems Engineering
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    • v.41 no.2
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    • pp.98-107
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    • 2016
  • Purpose: The aim of this study was to find an appropriate polymer film, which could reduce the water condensation for pallet-size modified atmosphere packaging (MAP). Methods: Five different types of films were selected from several commercialized films. Prior to the real food storage test, plastic boxes with wetted plastic balls were used to simulate the high humidity conditions of real food storage. The initial MAP condition was 5% oxygen and 95% nitrogen, and the $O_2$ concentration, the relative humidity and water condensation inside the films were checked on a daily basis. The MAP test for tomatoes was conducted by using the most appropriate film from the five films examined in this study. Results: Every film except Mosspack(R) indicated a similar variation in the $O_2$ concentration over the course of time. The relative humidity near the surfaces of all the films except nylon-6 approached saturation conditions over time. For three kinds of films, namely, low-density polyethylene (LDPE) film, anti-fogging oriented polypropylene (AFOPP) film, and Mosspack(R), the inner surfaces of the films were fully covered with dew after a storage period of a day. Conversely, an area of 4.5% was covered with dew in the case of the poly lactic acid (PLA) film, and there was no dew inside the nylon-6 film. The pallet-size MAP test for tomatoes was conducted by using the nylon-6 film and there was no water condensation inside the nylon-6 film over three weeks of storage. Conclusions: During the pallet scale MAP, water condensation could cause severe fungal infection and wetting of the corrugated box. Hence, it was important to minimize water condensation. This study showed that the MAP films with high WVTR such as nylon-6 and PLA could reduce the water condensation inside the pallet scale MAP.

Effect of pretreatment and packaging methods on quality of cold vacuum dried peach (전처리 및 포장방법이 냉풍감압건조 복숭아의 품질에 미치는 영향)

  • Kwon, Gi-Man;Kim, Jae-Won;Youn, Kwang-Sup
    • Food Science and Preservation
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    • v.20 no.3
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    • pp.317-322
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    • 2013
  • This study was conducted to investigate the effects of pretreatment and different packaging methods on the physicochemical properties of cold vacuum-dried peaches. All the dried peach samples were stored such as $N_2$ gas substitution, vacuum and passive packaged with polyethylene (PE) film and oriented polypropylene (OPP)/aluminum (Al)/PE film at $40^{\circ}C$ for 50 days. The weight change, pH, soluble solids content, titratable acidity, soluble solid-acid ratio (SS/TA), delta E, browning degree and phenolic compounds were analyzed. The weight change and pH were lower in the 0.1% vitamin C-treated group and were significantly lowest in the vacuum-treated OPP/AL/PE. The soluble solids content and the SS/TA were higher in the non-treated groups than in the vitamin C-treated groups. According to the packaging methods, the $L^*$ values were higher in the vacuum, $N_2$ gas and passive package, in that order. In addition, the browning degree and the delta E value were lower in the pretreated groups and significantly lowest in the vacuum-treated OPP/AL/PE with 0.1% vitamin C group. The phenolic compounds were high for the pretreated groups, according to the packaging methods (vacuum > $N_2$ gas> passive), and the OPP/AL/PE was significantly higher than the PE. These results suggest that different packaging materials and pretreatment methods affected the quality of the dried peaches, and the vacuum-OPP/AL/PE film packaging group showed a high quality.

Preparation of Alumina Sol Coated BOPP Composites and Their Gas Permeation Characteristics (Alumina Sol을 코팅한 BOPP 복합체의 제조 및 기체 투과 특성)

  • Hong, Seong-Uk;Oh, Jae-Won;Ko, Young-Deok;Song, Ki-Chang
    • Membrane Journal
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    • v.19 no.1
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    • pp.19-24
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    • 2009
  • Sol-gel process is relatively simple, easy to use, cheap to install, and results in thin coating layers with superior physical and gas barrier properties. Films coated by the sol-gel process can be used as insulating films or packaging films for foods, chemicals, drugs, and beverages, etc. In this study, alumina sol was synthesized from aluminum isopropoxide and silane coupling agent was added to make coating solutions. In addition, biaxially oriented polypropylene (BOPP) was coated using several alumina sol solutions and their oxygen permeabilities were measured. The experimental results indicate that in the best case, the oxygen permeability of coated film was reduced by 85% compared to that of pure BOPP.

Characterization of Silica/EVOH Hybrid Coating Materials Prepared by Sol-Gel Method

  • Kim, Seong-Woo
    • Journal of the Korean Applied Science and Technology
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    • v.26 no.3
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    • pp.288-296
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    • 2009
  • In this study, the silica-based hybrid material with high barrier property was prepared by incorporating ethylene-vinyl alcohol (EVOH) copolymer, which has been utilized as packaging materials due to its superior gas permeation resistance, during sol-gel process. In preparation of this EVOH/$SiO_2$ hybrid coating materials, the (3-glycidoxy-propyl)-trimethoxysilane (GPTMS) as a silane coupling agent was employed to promote interfacial adhesion between organic and inorganic phases. As confirmed from FT-IR analysis, the physical interaction between two phases was improved due to the increased hydrogen bonding, resulting in homogeneous microstructure with dispersion of nano-sized silica particles. However, depending on the range of content of added silane coupling agent (GPTMS), micro-phase separated microstructure in the hybrid could be observed due to insufficient interfacial attraction or possibility of polymerization reaction of epoxide ring in GPTMS. The oxygen barrier property of the mono-layer coated BOPP (biaxially oriented polypropylene) film was examined for the hybrids containing various GPTMS contents. Consequently, it is revealed that GPTMS should be used in an optimum level of content to produce the high barrier EVOH/$SiO_2$ hybrid material with an improved optical transparency and homogeneous phase morphology.

Effect of postharvest CO2 treatment on the quality of the 'Gonji-7ho' oyster mushroom (Pleurotus ostreatus) during oriented polypropylene packaging and storage (수확 후 CO2처리가 느타리버섯 곤지7호의 OPP 포장 저장 중 품질에 미치는 영향)

  • Choi, Ji-Weon;Lee, Ji-Hyun;Kim, Chang-Kug;Shin, Il-Sub;Bae, Yeoung-Seuk
    • Journal of Mushroom
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    • v.18 no.1
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    • pp.115-119
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    • 2020
  • This study was conducted to investigate the effect of post-harvest CO2 treatment on the quality of the 'Gonji-7ho' oyster mushroom. The harvested mushrooms were pre-cooled at 3℃ for 1 day and placed in a gas-tight chamber with 0%, 30%, or 50% of CO2 concentration for 3 hours at 3℃. Next, 400 g of the oyster mushroom sample was packaged into 20-㎛ thick oriented polypropylene (OPP) film bags and stored at 4℃ for 21 days. Treatment with 30% of CO2 treatment maintained the highest stipe firmness of the oyster mushrooms during storage. The stipe lightness (CIE L) was the highest at 14 and 21 days, while the stipe yellowness (CIE b) was the lowest at 2 and 7 days of storage. Therefore, we concluded that the 30% CO2 treatment maintained the overall visual quality of the 'Gonji-7ho' oyster mushroom until 17 days of storage at 3℃. Our results suggest that the shelf life of 'Gonji-7ho' oyster mushroom could be extended by the postharvest application of 30% CO2 for 3 hours during low temperature storage.

A study on the properties of TSC in oriented polypropylene film irradiated by laser (레이저로 조사된 이축연신 폴리프로필렌 필름의 열자격 전류특성에 관한 연구)

  • 노영배;홍진웅;김재환;이준웅
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1990.10a
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    • pp.98-101
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    • 1990
  • In order to investigate the laser effects resulted from the behaviors of carriers for BOPP film, experiment of TSC were carried out on the specimen with 15[$\mu\textrm{m}$] thick irradiated by He-Ne laser. The TSC spectras were observed in the temperature range of -100[$^{\circ}C$] to 130[$^{\circ}C$] with the electric field of 20∼60[MV/m], had show four of the distinguished peak such as ${\alpha}$$_1$, ${\alpha}$$_2$, ${\beta}$ and ${\gamma}$, which appeared at 115, 80, 17 and -30[$^{\circ}C$] respectively. Specially, ${\alpha}$$_1$ was observed and anomalous TSC flowing in the same direction as the charging current on the high-electric field such as 50∼60[MV/m]. In according on the consequences obtained from the studies, the origin of ${\alpha}$$_1$peak was attributed to the detrapping process form trap with 2.88[eV] deep of injected space charge from the chathode in the crystaline regions. The origin of ${\alpha}$$_2$ peak was regarded as the detrapping process of ions trapped with 0.9[eV] deep originated from impurity-ion remained in the specimen during production process of the material, in the crystalline regions. The origin of ${\beta}$ peak was concluded to be due to the depolarization process of "C=0"dipole with the activation energy of 0.75[eV] in the amorphous regions. The origin of ${\gamma}$ peak was responsible to the process combined with the depolarization of "CH$_3$", chain segment, with the activation energy of carriers from the shallow trap with 0.4[eV], in he amorphous regions.

Effect of Packaging Methods on Postharvest Quality of $Tah$ $Tasai$ Chinese Cabbage ($Brassica$ $campestris$ var. $narinosa$) Baby Leaf Vegetable (어린잎 채소 다채의 포장방법이 품질에 미치는 영향)

  • Lee, Jung-Soo;Lee, Youn-Suk
    • Food Science and Preservation
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    • v.19 no.1
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    • pp.1-6
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    • 2012
  • The effect of the packing methods for enhancing the shelf life and improving the postharvest quality of the $tah$ $tasai$ Chinese cabbage baby leaf vegetable was studied during storage. Fresh baby leaf vegetables were packed in four commercial packaging types: (1) a non-perforated bag with a 0.03-mm oriented polypropylene (OPP) film; (2) a perforated bag with 1.0-mm-diameter holes on an OPP film; (3) a 0.40-mm polyethylene terephthalate (PET) container with a hinged lid; and (4) an expanded polystyrene (EPS) tray wrapped with a 0.02-mm polyvinyl chloride (PVC) film. The quality parameters, such as the weight loss, moisture content change, color difference, and appearance of the baby leaf vegetables were investigated. The baby leaf vegetables in the PET container and in the non-perforated OPP film bag showed relatively low weight loss, high moisture content, and good external appearance compared to those in the EPS tray and in the perforated OPP film bag during limited storage periods, at $16^{\circ}C$. The PET container also protected the baby leaf vegetables from physical damage. The study results will enable the selection of a better packaging system for extending the freshness and increasing the market ability of baby leaf vegetables.

Effect of Washing Methods and Surface Sterilization on Quality of Fresh-cut Chicory (Clchorium intybus L. var. foliosum) (세정 및 표면살균에 따른 신선편이 치커리 제품의 품질 특성 변화)

  • Kwon, Ju-Yeon;Kim, Byeong-Sam;Kim, Gun-Hee
    • Korean Journal of Food Science and Technology
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    • v.38 no.1
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    • pp.28-34
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    • 2006
  • Effects of various surface sterilization and washing methods on sterilization of fresh chicory surface were evaluated. Fresh-cut chicory was washed with tap water for 1 min, 100 ppm chlorinated water, and 3 ppm ozonated water using mechanical washing machine for 3 min, packed with bi-axially oriented polypropylene (OPP 0.04 mm) film, and stored for 3 weeks at 4 and $10^{\circ}C$. Tap water washing resulted in approximately 1 log CFU/g reduction of microbial load, and ozonated water and chlorinated water treatments resulted in additional 2 log CFU/g reduction.