• 제목/요약/키워드: Corrugated Fiberboard

검색결과 77건 처리시간 0.027초

크리이프에 의한 과실 포장입자의 층적 내구성 분석 (Stacking Durability Analysis of Fruit , Packaging Boxes by Creep)

  • 박종민;권순홍;권순구;김만수
    • Journal of Biosystems Engineering
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    • 제21권2호
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    • pp.191-197
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    • 1996
  • Allowable stacking duration of the corrugated fiberboard boxes being widely used for packaging fruits and vegetables was analyzed by the creep behavior and the cumulative load correction factor for the boxes. The stacking boxes were assumed to be stored at a nearly constant temperature and relative humidity condition. When the stacking duration was short period, the stacking height determined by two methods showed a little difference between them, but almost no difference was shown as the stacking duration was longer. Allowable stacking duration was rapidly decreased with the increase of static load applied on the stacking boxes, and allowable stacking duration of Box A was estimated the longer than that of Box B. A model of allowable stacking duration for the corrugated fiberboard box was developed as a function of the stacking load and the ambient relative humidity.

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상대습도에 따른 농산물 포장용 골판지의 원지의 물리적 특성 변화 및 상자압축강도의 예측 (Physical Properties of Corrugated Fiberboard and Estimation of Box Compression Strength with Changes of Relative Humidity)

  • 조중연;신준섭;김종경
    • 한국포장학회지
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    • 제11권2호
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    • pp.91-96
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    • 2005
  • Determination of safety factor of corrugated fiberboard boxes used for agricultural products is very complicated process due to nature of living products. Moisture content is one of the most critical factors to determine overall physical strength of paper, so its influences on strength properties of corrugated board made from different raw materials must be quantified. The results obtained from the study were summarized as follows; 1. Results show a detrimental effect on bursting strength and compressive strength of liners with increasing relative humidity of environment and moisture content of liners. 2. The relevance of equilibrium moisture content at varying relative humidity levels was proved and its relationship was used as an important factor to estimate box compression strength. 3. Test results was statistically used for establish the relationship between relative humidity and moisture content of liners. Estimated compression strength of boxes at varying moisture content was similar to results of theoretical equations such as Kellicutt's. Further study could be carried out in order to determine a optimum safety factors of various corrugated board boxes for agricultural products.

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참외 포장용 골판지상자의 재질구성에 관한 연구 (Studies on Linerboard Compositions of Corrugated Fiberboard Boxes for Oriental Melons)

  • 하영선;이준호;김수일;박남호
    • 한국식품저장유통학회지
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    • 제7권2호
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    • pp.160-165
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    • 2000
  • The study aimed to review linerboard compositions of corrugated fiberboard boxes for Oriental melons(Cucumis melon L. var makuwa), analyzing relationships among material compositions, price, weight of boxes, theoretical compression and bursting strength of various liner boards. 19 and 22 different liner boards were currently used for the bleached and the unbleached corrugated boards, respectively. The corrugated board containers with the bleached liners were mostly used in the market although the average price was 10 percents higher than the unbleached. The average compression strength of the bleached. We strongly recommend to redesign the boxes because the average compression and bursting strength of the current boxes were much higher than national packaging standards as much as 70 and 82, respectively.

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농산물 포장용 골판지상자의 층적내구성의 분석과 향상에 관한 연구(I) -수분흡습특성과 압축강도열화- (Improvement and Analysis of Stacking Durability of Corrugated Fiberboard Boxes for Agricultural Products -Moisture Absorption Properties and Compressive Strength Reduction-)

  • 박종민;권순홍;권순구;김만수
    • Journal of Biosystems Engineering
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    • 제19권4호
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    • pp.358-368
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    • 1994
  • Major factors in reducing the stacking strength of corrugated fiberboard boxes in cold storage or transport conditions are high relative humidity, causing elevated moisture absorption by the boxes. The bottom boxes in a stack will deform to the critical deflection causing agricultural products damage there, and eventually additional deflection will cause box collapse and finally toppling of the stack. The study was conducted to determine the water absorption characteristics and the compressive strength of the corrugated fiberboard boxes being widely used in packaging agricultural products in Korea. The sample boxes for the study were selected from the regular slotted containers (RSC) types, and one was the box used in apple packaging (Box A), another one was the box used in pear packaging (Box B). The corrugated shipping containers were made from a large portion of recycled fibers in Korea, and comparing with Box B, Box A was fabricated from fiberboard which contained more percentage of old corrugated containers (OCC) imported from foreign countries than domestic waste paper. The results obtained from the study were summarized as follows ; 1. Equilibrium moisture content (EMC) of the sample boxes was established after about 20 hours, and the EMC by absorption was lower than that by desorption. The EMC increased with the increasing of relative humidity and with the decreasing of temperature, and the rate of increasing was much higher above the relative humidity of 50%. 2. The maximum compressive strength of Box A was about 100 kgf greater than that of Box B on the same enviromental conditions. The strength of the sample boxes decreased rapidly with the increasing of relative humidity. The effect of relative humidity on the strength was a little higher than that of temperature. 3. As the applied load was progressively increased and a level was reached, the vertical side panels ($L{\times}D$) deflected laterally inwards or outwards. The panels deflected laterally inwards at higher relative humidity. 4. The maximum compressive deflection ratio and the critical deflection ratio of the sample boxes were increased linearly with the increasing of relative hunidity, but trends for its ratios showed inconsistant response to temperature.

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과채류 포장용 골판지 상자의 안전계수 규격화 및 설계 프로그램 구축 (3) - 과실포장용 골판지상자의 안전계수 규격화에 대한 연구 - (Standardization and Computer Programing of Safety Factors of Corrugated Fiberboard Containers for Agricultural Products (III) - Safety factors and Standards on Corrugated Fiberboard Containers for Fruits -)

  • 조중연;신준섭;김종경;서영범;손기주
    • 한국펄프종이공학회:학술대회논문집
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    • 한국펄프종이공학회 2006년도 추계학술발표논문집
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    • pp.71-79
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    • 2006
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유한요소법을 이용한 골판지 포장화물내 배의 진동해석 (Vibration Analysis of Pears in Packaged Freight Using Finite Element Method)

  • 김만수;정현모;김기복
    • Journal of Biosystems Engineering
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    • 제29권6호
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    • pp.501-507
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    • 2004
  • Fruits we subjected to complex dynamic stresses in the transportation environment. During a long journey from 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. The vibration characteristics of the pears in corrugated fiberboard container in transit were analyzed using FEM (finite element method) modeling, and the FEM modeling approach was first validated by comparing the results obtained from simulation and experiment for the pear in the frequency range 3 to 150 Hz and acceleration level of 0.25 G-rms and it was found that between simulated and measured frequencies of the pears have a relatively good agreement. It was observed that the fruit and vegetables in corrugated fiberboard container could be analyzed by finite element method. As the elastic modulus of the cushion materials of corrugated fiberboard pad and tray cup decreased, the first frequencies of upper and lower pears increased and the peak acceleration decreased.

유통 중 진동충격에 의한 배 포장 완충재의 동적 변위 추정 (Estimation for Dynamic Deformation of the Cushioning Materials of Packaging for the Pears by Shock and Vibration During Transportation)

  • 정현모;박인식;김만수
    • 한국포장학회지
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    • 제11권1호
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    • pp.17-24
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    • 2005
  • During handling unitized products, they are subjected to a variety 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 on pallets has been resulted in a reduction in the manual handling of products and with it a reduction in the shock hazards. This has caused and increasing interest in research focused on vibration caused damage. the use of pallets as a base for unitizing loads, aids in the mechanical handling, transportation and storage of products. Besides aiding in the handling, transportation and storage of products, a pallet also acts on and interface between the packaged goods and the distribution environment. The determination of the impact deformation of the cushioning materials such as tray cup (polymeric foam) and corrugated fiberboard pad must be carried out to design 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. In this study, the theoretical analysis of impact deformation for cushioning materials by dynamic vibration. The impact deformations of SW and DW corrugated fiberboard pad in acceleration amplitudes of 0.25 G-rms and 0.5 G-rms that were usually generated in transport vehicles during distribution environments were very small compare with the thickness of corrugated fiberboard pad. The maximum of vibration acceleration level of tray cup by vibration impact was about 3.2 G-rms. The theoretical allowable acceleration (G-factor) of the pear was 0.7102 G-rms, and the maximum dynamic deformation estimated within G-factor was about 1 mm.

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