| Popis: |
段ボール箱の圧縮強度の推定は、Kellicutt 式やMcKee 式を基本にして様々な式が提案されている。しかしながら基本はJIS 0201 形式の強度を推定するもので、異形段ボール箱や仕切り入り段ボール箱の強度計算は個別の式が必要であった。新しい形式の段ボール箱の開発の際は、対応する強度計算式が無いため、実際に圧縮試験を行いながら設計しなければならなかった。そこで本報は個別の推定式を必要とせず、あらゆる形式の箱に対して適応可能な圧縮強度推定方法を提案する。はじめに箱の荷重を支えることのできるパネルに分解して個々の強度を算出し、最後に合算して箱全体の強度を推定する。この計算方法の妥当性を検証するため、圧縮強度の実測値と推定値を比較したところ、実用上充分な推定精度を得られることが確認できた。これにより、段ボール箱の設計・改良の効率化に貢献できると考えられる。Currently, several formulae for calculating compression strength of corrugated boxes have been proposed based on both the Kellicutt and McKee formulae. These formulae are based on regular slotted containers, so they cannot be applied to other varieties of boxes or boxes with partitions. For this reason, it is necessary to perform multiple tests in order to obtain sufficient reliable data related to compression strength. In this study, we propose a practical predicting method based on a novel formula that can be applied to all types of boxes. As stated in this method, first, the boxes are disassembled into panels. Second, the compression strength of each panel is calculated according to the formula. Finally, the compression strength of a box is obtained by adding the compressive strengths of each individual panel. To confirm the validity of our proposed method and formula, the obtained compression strength values are compared with the actual measured values. The results of this validation suggest that our method and formula provide sufficient accuracy to be widely applied to all types of boxes. In conclusion, our proposed method and formula can effectively contribute to the improvement of R&D related to the box design field. |
