• Journal of Biosystems Engineering
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• 제39권3호
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• pp.194-204
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• 2014

Purpose: The aim of this study was to develop long-term storage technology for Chinese cabbage in order to extend the period of availability of freshly harvested products. The scope of the paper deals with the use of a cooler with a remote monitoring and control interface in conjunction with use of packaging film. Methods: A cooler with a real time monitoring system was designed as a low-temperature storage facility to control temperature and relative humidity (RH). The effects of storage in high-density polyethylene (HDPE) plastic boxes, 3% chitosan dipping solution, polypropylene film (PEF) with perforations, and mesh packaging bags on physiological responses were investigated. The optimal storage temperature and humidity for 120 days were below $0.5^{\circ}C$ and 90%, respectively. Physiological and biochemical features of cabbage quality were also analyzed: weight loss, texture, and sugar salinity, chlorophyll, reducing sugar, and vitamin C contents. Results: The cooler with a remote monitoring and control interface could be operated by an HMI program. A $0.5^{\circ}C$ temperature and 90% humidity could be remotely controlled within the cooler for 120 days. Postharvest freshness of Chinese cabbages could be maintained up to 120 days depending on the packaging method and operation of the remote monitoring system. In particular, wrapping the cabbages in PEF with perforations resulted in a less than a 5% deterioration in quality. This study provides evidence for efficient performance of plastic films in minimizing post-harvest deterioration and maintaining overall quality of cabbages stored under precise low-temperature conditions with remote monitoring and a control interface. Conclusions: Packaging with a modified plastic film and storage in a precisely controlled cooler with a remote monitoring and control interface could slow down the physiological factors that cause adverse quality changes and thereby increase the shelf life of Chinese cabbage.

• 펄프종이기술
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• 제48권2호
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• pp.20-27
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• 2016

Ethylene gas is a natural hormone that directly affects the freshness of agricultural products, so it is very important for the maintenance of freshness to remove ethylene gas from corrugated board boxes. Many methods for the removal of this and other gases have been reported. In this study, the utilization of an absorbent using activated carbon was adopted for the removal of ethylene gas from a corrugated board box. Activated carbon powders were prepared by grinding in a laboratory and were used to treat the surface and to laminate paperboards with a starch solution. The ethylene gas absorption was evaluated by using a gas chromatography to measure the residual ethylene gas concentration. About 60% of the ethylene gas was absorbed by the activated carbon itself. However, the paperboards that were surface-treated and laminated with starch and activated carbon showed lower than 20% ethylene gas absorption. This was because the starch and smaller particles of activated carbon blocked the surface pores of activated carbon particles. Therefore, either the use of the binders must be minimized for the surface treatment of paperboards, or activated carbon packs can be used as absorbents in corrugated boxes.

• 한국포장학회지
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• 제12권2호
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• pp.103-108
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• 2006

In order to determine safety factor of corrugated fiberboard boxes for agricultural products, relationship with effect of relative humidity and structure of box types must be defined. The results obtained from the study were summarized as follows; 1. Results show a detrimental effect on bursting strength of corrugated boards with increasing relative humidity of environment. 2. Compression strength of corrugated boards were decreased rapidly after the relative humidity was over 70 percent. 3. Compression strength of corrugated board boxes were greatly depending on the box types. Folder type showed the best performance at higher humidity environment while bliss type was the worst. 4. Further studies are needed in order to expect box compression strength in real distribution environment.

• 펄프종이기술
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• 제35권2호
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• pp.33-38
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• 2003

In order to design the high strength corrugated fiberboard containers for agricultural products that can be used for the cold chain system, a large number of individual boxes were placed in various humidity environments at two different temperature of 5 and $20^{\circ}C$. The results indicated that temperature changes do not effect on physical strength of corrugated fiberboard containers as much as humidity changes did. The main conclusion from this study was that compression strength of corrugated fiberboard containers dropped significantly at high humidity condition, but the rates varied depending on the number of walls, temperature, and perimeter of containers. The packaging designer must consider the corrugated fiberboard boxes are also greatly affected by dimensional variations such as the length versus width ratio. Based on this study, water-resistant board would not be necessary if the ambient relative humidity does not reach to a critical point, 85 percent in the cold chain system. However, the designer must count for the unexpected fluctuation of rotative humidity resulting in severe loss of the compression strength of corrugated fiberboard container.

• Applied Biological Chemistry
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• 제41권6호
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• pp.442-446
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• 1998

분자량이 다른 3가지 종류의 키토산의 Escherichia coli에 대한 항균효과를 측정하였고 이들을 라이너지 코팅에 적용했을 때의 균성장억제 효과와 지류포장재에 적용했을 때 딸기의 저장기간을 증대시키는지에 대해 연구했다. 키토산은 그 분자량에 따라 항균효과가 다른 것으로 알려지고 있는데 본 연구에서 사용한 3가지 종류의 키토산은 E. coli에 대하여 모두 항균효과를 보였다. 키토산 A에서는 40 ppm 이상에서 항균효과를 보였으며 키토산 B와 C는 10 ppm 이상에서 항균효과를 나타내었다. 라이너지에 3가지 종류의 키토산을 코팅하여 항균효과를 보았는데 라이너지에 코팅된 상태에서도 세 종류의 키토산은 균의 성장을 저해하는 것을 보여주었다. 분자량이 다른 3가지 종류의 키토산에서 가장 큰 항균효과를 보이는 키토산 B를 코팅한 지류포장재로 딸기를 포장하여 저장실험을 행하였다. 딸기의 저장증대 효과는 저온저장이 가장 중요하다는 것을 보여 주었으며 포장방법별 저장증대 효과에서는 키토산을 코팅한 지류포장재가 딸기의 저장기간을 증대시키는 것을 보여주었다.

• 무역상무연구
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• 제67권
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• pp.187-208
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• 2015

The Korea China FTA was signed on June 1 2015. It includes some concessions regarding major export items in the manufacturing sector for the protection of primary industries and preferential tariffs for a number of products produced in the Kaesong Industrial Complex. Primary industries are what the Korean government paid the greatest attention to. Rice was excluded from the negotiations from the get go, and was joined by 548 other food items including pork, apples, pears, beef, chili, garlic etc. These foodstuffs account for about one-third of the agricultural and livestock products that Korea produces, and are not going to be subject to tariff elimination. The results of the study are as follows: Korean government policy is to maintain of agri-food export support system, eliminate of agri-food non-tariff barriers, foster of agri-food export SMEs and expand of investment of foreign agri-food company. Korean firms strategy is to establish of regional marketing strategy, ensure of high quality agri-food and develop of food packaging technologies, establish of agri-food export logistics center and take advantage of the FTA preferential tariff.

• 한국식품저장유통학회지
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• 제4권2호
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• pp.197-213
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• 1997

The actual status of production, management and export of 96 traditional food processing companies which supported by the government in Kyungpook province were investigated. Governmental support contributed to the increase of farmhouse income, employment and depreciation of agricultural products a bit, but it was supported mostly to unexperienced party. Technologies for food processing developed in institute and college were little. 42 percent of packaging design was developed by service commission, but the agency was very limited. Total export price in 1996 was 2.3 billion Won, but it was decreased in 1997. The responce to the prospect of traditional food processing work, 37.5 percent replied that this work can bring up as exportable product, but ambiguious response was a little. To settle a weakness of farming food processing work, the establishment of special marketing comapny was required and this company should accomplish marketing advertizing and exporting business.

• 한국식품저장유통학회:학술대회논문집
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• 한국식품저장유통학회 2003년도 제23차 추계총회 및 국제학술심포지움
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• pp.187-187
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• 2003

To examine the effect of packaging method on strawberry, tomato, and plum quality, the rate of weight loss, Hunter a value, decay rate, anthocyanin contents, and microbial (total bacterial counts, mold and yeast, and pseudomonas) changes were determined during storage. Strawberry was packaged with low density polyethylene (LDPE). Tomato and plum were packaged with high density polyethylene film (HDPE). Strawberries, tomatoes, and plums were then stored at 4$^{\circ}C$ and 20$^{\circ}C$, respectively. LDPE package was the most effective on the decrease of decay rate of strawberry and the rate of weight loss for packaged strawberry was lower than that of the non-packaged. HDPE package was the most effective on the rate of weight loss during storage of tomatoes and plums regardless of storage temperature. Hunter a value increased during storage. Anthocyanin contents of plums increased overall with increasing storage time, and plums stored without package were changed more than those with package. Microbial changes of strawberry, tomato, and plum stored at 4$^{\circ}C$ and 20$^{\circ}C$ were monitored during storage. Packaging method did not affect the microbial change, yet temperature did affect the microbial change significantly. These results indicate that storage of these commodities at 4$^{\circ}C$ should be recommended in terms ,of microbial safety as well as quality and shelf-life.

• 농업과학연구
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• 제32권1호
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• pp.29-42
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• 2005

본 연구에서는 청과물 포장설계 시 중요한 자료가 되는 참외의 공진 주파수 및 정점가속도 등과 같은 진동특성을 분석하기 위하여 실험 장치를 구성하고 진동시험장치의 제어 및 계측을 위한 컴퓨터 프로그램을 개발하였다. 이를 이용하여 참외의 진동 특성을 측정하였으며 이들과 참외의 기본적인 물성 값인 질량, 체적 및 장 단축과의 관계를 구명하였던 주요 연구결과를 요약하면 다음과 같다. 1. 참외의 진동특성을 분석할 수 있는 실험 장치를 구성하였으며, 장치의 제어와 계측을 위한 컴퓨터 프로그램을 개발하였다. 2. 공시 참외의 공진 진동수는 약물결 50.8~72.6 Hz 범위로 나타났으며, 점점 가속도는 약1.24~1.92G-rms범위로 나타났다. 3. 참외의 공진 주파수 및 정점 가속도는 참외의 질량, 체적 및 장 단축이 증가함에 따라 감소 하였으며 참외의 질량과 공진 주파수 및 정점 가속도와의 상관관계가 가장 높게 나타났다. 4. 참외의 공진주파수 및 정점가속도를 추정할수 있는 회귀모형을 참외의 질량 및 장 단축을 독립변수로 하여 개발하였으며 회귀모형을 평가한 결과 참외의 질량과 장 단축을 측정하면 참외의 공진 주파수와 정점 가속도를 추정할 수 있을 것으로 판단되었다.

• 펄프종이기술
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• 제45권3호
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• pp.45-51
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• 2013

We developed a new antibacterial material, a non-woven fabric, a sulfur solution, and a new adhesive system to manufacture a new type of functional hybrid corrugated board in previous studies. Based on experimental data, the prototypes of functional hybrid corrugated boards were manufactured and their physical properties and functionalities, including antibacterial property and the freshness maintenance of sweet persimmon, were measured in this study. The functional hybrid corrugated board could be manufactured in the actual process with linerboards, non-woven fabrics, and other materials without any troubles, and was strong enough to be used as a packaging box for agricultural products. The antibacterial property of the hybrid corrugated board showed a value high enough to eliminate bacteria, which could deteriorate the sweet persimmons. Based on appearance observations, weight loss and firmness measurements, the freshness of sweet persimmons in the functional hybrid corrugated board was maintained better than it was in the conventional corrugated board.