• 한국식품저장유통학회지
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• 제5권4호
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• pp.331-334
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• 1998

기능성 MA필름을 생산하여 이를 골판지 상자의 내부에 첨합시킨 FC상자의 활용가능성을 조사하고자 골판지 상자와 기능성 MA필름대를 골판지 상자 내부에 첨합시킨 FC포장구와 LDPE 및 기능성필름과 대조구로 골판지 상자만으로 포도를 포장하여 25 C에 저장하여 품질변화를 조사한 결과, FC 상자와 LDPE와 CE포장구는 대조구 보다는 중량감소율이 현저히 낮았으며 비타민C의 함량도 33% 높게 유지되고 있었다. 산도와 환원당 함량은 포장구들간에는 큰차이가 없었다. 외관 및 부패를 조사한 결과 대조구에 비해 개발포장구에서 품질이 더 높게 유지되고 있어 FC 포장재를 포도 포장용 상자로 활용가능성이 확인되었다.

• Food Science and Biotechnology
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• 제15권1호
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• pp.5-12
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• 2006

Degradation performance of environmentally friendly plastics that can be disintegrated by combination of sunlight, microbes in soil, and heat produced in landfills was evaluated for use in industries. Two multi-degradable master batches (MCC-101 and MCC-102 were manufactured, separately mixed with polyethylene using film molding machine to produce 0.025 mm thick films, and exposed to sunlight, microbes, and heat. Low- and high-density polyethylene (LDPE and HDPE) films containing MCC-101 and MCC-102 became unfunctional by increasing severe cleavage at the surface and showed high reduction in elongation after 40 days of exposure to ultraviolet light. LDPE and HDPE films showed significant physical degradation after 100 and 120 days, respectively, of incubation at $68{\pm}2^{\circ}C$. SEM images of films cultured in mixed mold spore suspension at $30^{\circ}C$ and 85% humidity for 30 days revealed accelerated biodegradation on film surfaces by the action of microbes. LDPE films containing MCC-l01 showed absorption of carbonyls, photo-sensitive sites, at $1710\;cm${-1}$ when exposed to light for 40 days, whereas those not exposed to ultraviolet light showed no absorption at the same frequency. MCC-101-based LDPE films showed much lower $M_w$ distribution after exposure to UV than its counterpart, due to agents accelerating photo-degradation contained in MCC-101.

• 한국식품저장유통학회지
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• 제1권2호
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• pp.93-98
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• 1994

Fresh ginseng was packed by using available commercial plastic films of polyvinyl chloride (PVC), cast polypropylene (CPP) and low density polyethylene (LDPE). PVC was used as a wrapping on polystyrene tray, and CPP and LDPE were applied as pouch packages. Gas composition of the package and keeping quality of ginseng in the packages were evaluated for 20 day storage at 5$^{\circ}C$. LDPE (27$\mu\textrm{m}$ thick) Package modified the Package atmosphere to 11.7% O2 and 2.1% CO2, gave low microbial growth and good sensory score after 20 day storage.

• 한국식품과학회지
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• 제25권3호
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• pp.270-276
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• 1993

잎상치를 $20{\mu}m$ LDPE(perforated), $20{\mu}m$ LDPE, $30{\mu}m$ HDPE, $40{\mu}m$ LDPE 필름으로 포장하여 $4^{\circ}C,\;10^{\circ}C$ 및 $20^{\circ}C$에서 저장 중 품질변화를 관찰하였다. 상치의 저장수명에 가장 크게 영향을 미치는 인자는 온도로서 저장온도 $4^{\circ}C$에서 상치 품질이 가장 양호하게 보존되었으며, 무포장구와 비교하여 필름 포장구의 저장수명이 $10{\sim}15$배 가량 더 연장되었다. 포장재질별로는 $20{\mu}m$ LDPE(perforated)와 $20{\mu}m$ LDPE 포장구에서 부패 및 변색이 발생하여 상치의 상품적 가치가 비교적 단기간에 저하되었다. 이에 반해 $30{\mu}m$ HDPE와 $40{\mu}m$ LDPE 포장구에서는 중량감소, 변색, 고형분 함량, 조직감, 부패 등 모든 상치의 품질면에서 우수한 결과를 나타내었으며, 특히 $40{\mu}m$ LDPE 포장구에서 더 우수한 결과를 나타내었다.

• 한국재료학회지
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• 제29권10호
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• pp.603-608
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• 2019

Plastic waste is becoming a problem in various countries because of the difficulty of natural decomposition. One type is PET plastic(Polyethylene Terephthalate), which is often used as a bottle for soft drink packaging, and LDPE(Low Density Polyethylene), which is also widely used as a food or beverage packaging material. The use of these two types of plastic continuously, without good recycling, will have a negative impact on the environment. Building material waste is also becoming a serious environmental problem. This study aims to provide a solution to the problem of the above plastic waste and building material waste by making them into a mixture to be used as bricks. Research is carried out by mixing both materials, namely plastic heated at a temperature of $180-220^{\circ}C$ and building material waste that had been crushed and sized to 30-40 mesh with homogeneous stirring. The ratios of PET and LDPE plastic to building material waste are 9 : 1, 8 : 2, 7 : 3, 6 : 4 and 5 : 5. After heating and printing, density, water absorption and compressive strength tests are carried out. Addition of PET and LDPE plastic can increase compressive strength, and reduce water absorption, porosity and density. A maximum compressive strength of 10.5 MPa is obtained at the ratio of 6 : 4.

• Food Science and Biotechnology
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• 제16권2호
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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.

• 한국식품저장유통학회지
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• 제7권1호
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• pp.33-37
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• 2000

Effects on keeping quality according to the different package environment in cabbage and brccoli were studied. Opened 2 mil LDPE (low density polyethylene) sealed 4 mil LDPE and BA(barrier polyethylene) were used as package films. Weight loss was markedly in opened 2 mil LDPE in cabbage and broccoli as 6 and 28%, respectively. Carbon dioxide was higher in seal-packaging cabbage and broccoli with BA held at 4 $^{\circ}C$ was above 15 and 31% within 15 days, respectively, while oxygen content was depleted to 2% or less after 10 days. The main difference between volatile sulfur-containing compounds produced from cabbage and broccoli were the relative quantities and rates of production of hydrogen sulfide, carbonyl sulfide, methanethiol and dimethyl disulfide in opened 2 mil LDPE , sealed 4 mil LDPE and barrier bags during storage.

• 한국식품영양과학회지
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• 제29권2호
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• pp.248-251
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• 2000

To investigate the effects of packaging films (functional MA films/FC30, FC50, MA film/0.03 mm LDPE, corrugated paperboard box/control) weight loss, firmness, total ascorbic acid, chlorophill and overall appearence were evaluated. Weight loss of cucumbers packed with FC30 and FC50 at 2$0^{\circ}C$ after 7 days were 1.0 and 0.6%, that of the control was 2.9%, those of LDPE was 0.5%. The firmness of FC30 and FC50 at 2 $0^{\circ}C$ after 7 days were 1.0 and 0.6%, that of the control was 2.9%, those of LDPE was 0.5%. The firmness of FC30-, FC50 and LD was higher than that of the control. Total ascorbic acid contents (TAA) of cucumbers packed with control, LD, FC30 and FC50 box were 9.96, 10.86, 11.37 and 11.29 mg% after 7 days. TAA of FC box was 10% higher than that of the control. Chlorophill content of FC boxes wase 16% higher than of the control. Overall appearence of cucumber packed with FC boxes was better than that of the control.

• 한국식품저장유통학회지
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• 제14권5호
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• pp.457-461
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• 2007

영주산 '후지' 사과의 전처리 및 포장방법별 저장기간 동안 품질변호를 알아보기 위하여 사과를 5% $CaCl_2$ 용액에 15분 동안 침지한 후 완전히 건조시켜 $25\;{\mu}m$ 두께의 LDPE 필름으로 박스단위로 포장하여 $0^{\circ}C$의 농협 현지저온저장고에서 21주간 중량감소율, 경도, 적정산도, 가용성 고형분함량, 비타민 C함량, 부패율 조사하였다. 중량감모율, 경도변화, Vitamin C 변화, 부패율 등에서 칼슘처리과 필름포장을 병행한 처리구(Ca-MA)가 다른 처리구에 비해 저장 중 품질변화가 가정 적은 것으로 나타나 영주산 '후지' 사과 저장시 선도유지에 효과적인 것으로 사료된다.

• 한국식품저장유통학회지
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• 제9권3호
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• pp.267-270
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• 2002

땅콩의 새로운 소비형태인 풋땅콩의 적정 저장방법을 구명하고자 생협실 및 증자협 실을 상온 및 4$^{\circ}C$에서 저장 중 품질변화를 조사한 결과를 요약하면 다음과 같다. 수분함량은 상온 및 4$^{\circ}C$에서 저장기간이 경과할수록 감소되는 경향이었으며 생협실과 증자협실 모두 상온저장이 4$^{\circ}C$저장보다 감소율이 높았으며, Ny/LDPE film 진공포장이 LDPE film 포 장보다 감소율이 낮았고 증자협실이 생협실보다 감소율이 높았다. 상온 및 4$^{\circ}C$저장 증자땅콩의 협 색상은 저장당시와 유사하게 갈변되지 않았으나, 생협은 상온 및 4$^{\circ}C$의 진공포장에서 개봉후 심한 갈변현상을 나타냈다. 상온저장은 생협과 증자협 모두 저장 후 2일째, 4$^{\circ}C$저장은 저장 후 21일째 변질되기 시작하였으며, 생협을 망에 넣어 4$^{\circ}C$에 저장한 경우 30일 후에도 변질되지 않았으나 21일 저장후 43%의 수분감소로 딱딱해졌다. 저장기간 중 생협의 L값은 Ny/LDPE film 진공포장시 변화가 적었고 4$^{\circ}C$ LDPE film 포장에서는 생협과 생종실 모두 L값이 감소한 반면 b값은 증가하였으며, 생협의 a값은 4$^{\circ}C$ 진공포장시 저장초기에 비하여 증가하였고, 4$^{\circ}C$ 저장에서 증자종실의 경도는 포장방법에 관계없이 변화가 없었으나 생종실은 저장기간이 경과함에 따라 감소하는 경향을 나타냈다. 이상에서와 같이 풋땅콩의 생협 실저장은 4$^{\circ}C$에서 LDPE 포장으로 7일, Ny/LDPE 진공포장으로 14일간 저장이 가능하고 증자협실은 LDPE 포장 및 Ny/LDPE 진공포장으로 14 일간 저장 가능한데 증자협실의 저장기간 연장을 위해서는 저장온도를 낮추 거나 전처리 방법에 대한 검토가 이루어져야 하며 생협실은 4$^{\circ}C$에서 양파망을 이용할 경우 30일 이상 저장 가능하나 딱딱해지는 문제점이 있으므로 이에 대한 추후 검토가 이루어져야 할 것이다.