• 펄프종이기술
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• 제47권1호
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• pp.1-9
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• 2015

Wood fibers for medium density fiberboard (MDF) was used in the filler layer of the white duplex board for increasing thickness and bulk of the board. The MDF fibers were treated with ozone (3% based on dry weight of the fibers), and mixed together with OCC (old corrugated container) to form paper. Ozone-treated MDF fibers gave high bulk, high tensile strength, high internal bond and fast drainage to the furnish mixed with OCC. It was shown that there were possibilities to reduced basis weight of the filler layer without loss of thickness, stiffness, and tensile strength. Furthermore, it showed the possibility to develop a new kind of board product that has high stiffness as well as high strength properties with light basis weight by application of the ozone-treated MDF fibers.

• Journal of Biosystems Engineering
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• 제27권5호
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• pp.391-398
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• 2002

During handling unitized products, they are subjected to a variety of environmental hazards. Shock and vibration hazards are generally considered the most damaging of the environmental hazards on a product and it may encounter while passing through the distribution environment. A major cause of shock damage to products is drops during manual handling. The increasing use of unitization of pallets has been resulted in a reduction of the shock hazards. This has caused an increasing interest in research focused on vibration caused dam age. Damage to the product by the vibration most often occurs when a product or a product component has a natural frequency that falls within the range of the forcing frequencies of the particular mode of transportation being used. Transportation vibration is also a major cause of fruit and vegetable quality loss due to mechanical damage. This study was conducted to determine the vibration characteristics of the corrugated fiberboard bones for packages of pears, and to investigate the degree of vibration injury of the pears in the boxes during the simulated transportation environment. The vibration tests were performed on an electrohydraulic vibration exciter. The input acceleration to exciter was fixed at 0.25 G for a single container resonance test and 0.5 G for the vertical stacked container over the frequency range from 3 to 100 Hz. Function generator (HP-33120A) was connected by wire to the vibration exciter for controlling the input acceleration at a continuous logarithmic sweep rate of 1.0 octave per min. The peak frequency and acceleration on the single box test were 22.02 Hz, 1.5425 G respectively, and these values on the vertical stacked boxes were observed from the bottom box 19.02, 18.14, 16.62 and 15.40 Hz and 2.2987, 3.7654. 5.6087, and 7.9582 G, respectively. The pear in the bottom box had a slightly higher damage level than the fruit packed in the other stacked boxes. It is desirable that the package and transportation system has to be so designed that 15∼20 Hz frequency will not occur during the transportation environment.

• 한국식품저장유통학회지
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• 제5권2호
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• pp.150-153
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• 1998

As strait As a result of the quality research of liner boards used for the national-made corrugated boxes for apples, basis weight of each sample passed its tolerance within 4%. We found that KA, WLK, and SC liner boards showed better in relative bursting strength. SC, WLK, KA, and SK performed better in relative compression strength. WLK201 and KA210 were good for the outside liner, and K2200 was adequate for medium and inside liner. we classified WLK and KA liner boards as A grade and others as C grade.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2003년도 동계 학술대회 논문집
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• pp.321-328
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• 2003

Fruits are subjected to complex dynamic stresses in the transportation environment. During a long journey form the production area to markets, there is always some degree of vibration present. Vibration inputs are transmitted from the vehicle through the packaging to the fruit. Inside, these cause sustained bouncing of fruits against each other and container wall. These steady state vibration input may cause serious fruit injury, and this damage is particularly severe whenever the fruit inside the package is free to bounce, and is vibrated at its resonant frequency. The determination of the resonant frequencies of the fruit may help the packaging designer to determine the proper packaging system providing adequate protection for the fruit, and to understand the complex interaction between the components of fruit when they relate to expected transportation vibration inputs. (omitted)

• 한국포장학회지
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• 제11권1호
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• pp.11-16
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• 2005

Fruits are subjected to complex dynamic stresses in the transportation environment. During a long journey form the production area to markets, there is always some degree of vibration present. Vibration inputs are transmitted from the vehicle through the packaging to the fruit. Inside, these cause sustained bouncing of fruits against each other and container wall. These steady state vibration input may cause serious fruit injury, and this damage is particularly severe whenever the fruit inside the package is free to bounce, and is vibrated at its resonance frequency. The determination of the resonant frequencies of the fruit may help the packaging designer to determine the proper packaging system providing adequate protection for the fruit, and to understand the complex interaction between the components of fruit when they relate to expected transportation vibration inputs. The first frequency of the pear in packaged freight be stacked in resonance frequency band of the pear packaged freight was increased from the bottom to the top of the stack but the second frequency of that in resonance frequency band of the pear was decreased. This indicated that the high damage score of the pear in bottom tier in vibration test was due to higher acceleration level in resonance frequency band of the pear.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2003년도 하계 학술대회 논문집
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• pp.347-352
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• 2003

농산물 포장화물의 경우 농산물의 손상은 겉포장 상자의 파손에 의한 압상이 주요 원인이다. 따라서 농산물 상자의 경우 압축강도를 특히 중요시 여기고 있으며, 한국산업규격을 비롯해 각종 농산물 관련 규정에서는 압축강도에 의한 상자의 품질관리를 규정화 하고 있다. 골판지 상자의 압축강도는 원단인 골판지의 구성 원지들(라이너, 골심지)의 품질과 이들의 구성 형태 및 상자의 외형 치수 비율에 따라 결정되므로, 원지의 링크라쉬(ring crush), 원단의 수직압축강도(edgewise compression strength)를 통해 상자의 압출강도를 관리하는 것이 보통이다. 또한 골판지 상자는 제작 후 유통 과정을 거치면서, 여러 요인에 의해 압축강도가 현격하게 저하되는데, 이중 수분 흡습에 의한 강도저하와 장기 누적하중, 진동 및 충격 등의 피로로 인한 강도 저하가 가장 크다. 여러 산업 분야에서 골판지 상자의 견고성 문제는 물품의 내수 및 수출시 제품에 대한 신뢰성 확보와 기업의 이미지 제고와 직결되는 중요한 사항이다. 특히, 세계 각 국의 농산물 시장이 개방됨에 따라 우리나라 농산물의 수출도 확대될 전망이고 또한 마땅한 대체재가 개발되지 않는 한 골판지 상자의 이용은 날로 증가될 것으로 전망된다. 따라서 골판지 상자의 압축강도와 내구성 향상에 대한 다각적인 연구가 절실하다. (중략)

• 한국포장학회지
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• 제15권3호
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• pp.83-91
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• 2009

미국과의 FTA 체결이 가시화되면서 우리 농산물에 대한 경쟁력과 농가의 소득증대를 위해 멜론수출사업이 시작되는 단계에서 장거리 운송에 상품성을 유지할 수 있는 수출 포장기술의 개발과 포장표준화에 의한 물류비 절감이 필요하다. 본 연구는 수출포장의 1단계라고 할 수 있는 적정포장 설계 부분, 즉 포장강도 및 치수규격 그리고 포장원가 관리 부분에 목적이 있다. 수출대상국인 미국과 일본의 국가표준 파렛트는 각각 T12형($1,200{\times}1,000$ mm)과 T11형($1,100{\times}1,100$ mm)이다. 기존 멜론상자 치수는 $366{\times}275{\times}160$ mm으로 T11형에는 정합하지만, T12형에는 효율성이 떨어지므로 포장모듈치수에 의거하여 멜론상자를 재설계하여, $366{\times}275{\times}165$ mm와 $333{\times}300{\times}200$ mm의 두 가지 규격으로 개선 멜론상자를 설계하였다. $366{\times}275{\times}165$ mm로 개선된 상자는 T11형 파렛트에 적재효율 92.7%, 공간효율 99.8%를 나타내며 일본수출용 멜론상자로 사용할 수 있었고, $333{\times}300{\times}200$ mm로 개선된 상자는 T12형 파렛트에 적재효율 91.7%, 공간효율 95.9%를 나타내며 미국수출용 멜론상자로 사용할 수 있었다. 기존 멜론상자의 포장재질은 SC240/B150/K180/B150/WK180이며, 압축강도 는 559 kgf, 관리강도는 475 kgf이었지만, 개선 멜론상자의 포장재질은 SC240/K180/K180/K180/WK180로써, 압축강도는 597 kgf, 관리강도는 5.7 kgf으로 증가하도록 강도를 높였다. 멜론상자의 1개당 단가는 기존 438원이었으나, 실제로 1,000에 거래하여 개선하도록 요구하였다. $366{\times}275{\times}165$ mm와 $333{\times}300{\times}200$ mm의 치수규격의 개선 멜론상자의 1개당 단가는 각각 484원과 470원으로 나타났다. 기존 포장재의 진동시험 결과 기존 멜론상자는 멜론의 상품화가 되지 않을 정도의 멜론 파손정도가 심했지만, 개선 멜론 상자는 처음 포장형태 그대로 멜론의 상태가 유지되어 상품화에 문제가 없었다.