통합 검색 | Korea Science

Experimental Investigation for Flexural Stiffness of Paperboard-stacked Structure

Lee, Myung-Hoon;Park, Jong-Min
- 한국포장학회지
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- 제7권1호
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- pp.9-15
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- 2001
Top-to-bottom compression strength of corrugated fiberboard boxes is partly dependent on the load-carrying ability of the central panel areas. The ability of these central areas to resist bending under load will increase the stacking strength of the box. The difference of box compression strengths, among boxes which are made with identical dimensions and fabricated with same components but different flute sizes, is primarily due to difference of the flexural stiffness of the box panels. Top-to-bottom compression strength of a box is accurately predicted by flexural stiffness measurements and the edge crush test of the combined boards. This study was carried out to analyze the flexural stiffness, maximum bending force and maximum deflection for various corrugated fiberboards by experimental investigation. There were significant differences between the machine direction (MD) and the cross-machine direction (CD) of corrugated fiberboards tested. It was about 50% in SW and DW, and $62%{\sim}74%$ in dual-medium corrugated fiberboards(e.g. DM, DMA and DMB), respectively. There were no significant differences of maximum deflection in machine direction among the tested fiberboards but, in cross direction, DM showed the highest value and followed by SW, DMA, DMB and DW in order. For the corrugated fiberboards tested, flexural stiffness in machine direction is about $29%{\sim}48%$ larger than cross direction, and difference of flexural stiffness between the two direction is the lowest in DMA and DMB.
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통기성 상자 구조물의 강도적 최적화 연구(II)-유한요소해석 (Strength Optimization of Ventilating Container(II)-Finite Element Analysis)

박종민
- 한국포장학회지
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- 제7권2호
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- pp.25-30
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- 2001
Corrugated board is composed of cellulose fibers which are arranged with the same direction as the board manufactured. The direction is classified with machine direction (MD) and cross-machine direction (CD). Therefore, corrugated board is orthotropic material that has totally different strength properties at each direction and especially, at machine direction, the mechanical properties of fiberboard is superior. The compression strength of the corrugated fiberboard boxes is very important information to the manufacturers and the end users. This study was carried out to design the optimum pattern, size, and location of ventilating hole for ventilating container through the finite element analysis. The optimum pattern and location of ventilating and hand hole were vertical oblong, a short distance to the right and left from the center of panel, and center or a short distance to the top of both sides, respectively. We identified the effect on both stress dispersion and stress level from the analysis of redisigned hand hole.
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저급 국산골판지원지의 강도강화방법 연구 (Improvement of Physical Properties of Low Quality Recycled Corrugated Fiberboard Liners)

김종경;류운형;주상명;이환
- 한국포장학회지
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- 제11권1호
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- pp.41-46
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- 2005
For both economic and ecological reasons corrugated box manufacturers are seeking to produce acceptably strong boxes while using more recycled paper. This study was to develop hydrophilic coating agents in order to improve overall physical properties of recycled corrugated fiberboard liners. Two coating agents were developed and applied to 'S' corrugating medium. The results showed that compression strength of new liners, named 'S-A' and 'S-B', were increased significantly both standard humidity and high humidity environment and it was as much as 'SK' liner. New developed liners were also economically advantageous since new liners were estimated about one hundred fifty dollars per ton cheaper than SK liner. The study indicated that further work is needed on the coating technology and machine development.
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상대습도 및 상자구조에 따른 과실포장용 골판지상자의 압축강도 분석 (Effect of Relative Humidity and Box Structure on Box Compression Strength)

조중연;신준섭;김종경;서영범;손기주
- 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.
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