친환경 무라벨 사각 PET 용기의 경량 및 강성 균형 설계
A Study on the design of lightweight and stiffness trade-offs for eco-friendly unlabeled square PET bottle
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As global plastic consumption increases and environmental concerns grow, lightweighting and recyclability of PET containers has become a key priority for the packaging industry. Lightweighting reduces material use, energy consumption, carbon emissions, and costs, but excessive thickness reduction can compromise structural integrity, leading to durability issues. This study proposes a design strategy to achieve both weight reduction and structural stability of an eco-friendly labelling-free rectangular PET container by optimising the rib structure while considering non-uniform thickness distribution. The measured thickness variations were incorporated into FEM-based structural and buckling analyses. The rib orientation, number and placement were varied to evaluate the buckling loads and deformations under axial and transverse loading. The results showed that the vertical rib model (E) improved the buckling load by 284%, while the central rib placement in the horizontal model reduced the axial and transverse deformation by 35% and 4%, respectively. The hybrid rib design (H) mitigated structural weaknesses, improving performance by 324% without increasing weight. This study provides practical guidelines for the design of lightweight PET containers by highlighting the interaction between thickness distribution and rib structure. Future studies incorporating DOE-based optimisation can further enhance lightweighting strategies for different container shapes and molding processes.
Abstract
As global plastic consumption increases and environmental concerns grow, lightweighting and recyclability of PET containers has become a key priority for the packaging industry. Lightweighting reduces material use, energy consumption, carbon emissions, and costs, but excessive thickness reduction can compromise structural integrity, leading to durability issues. This study proposes a design strategy to achieve both weight reduction and structural stability of an eco-friendly labelling-free rectangular PET container by optimising the rib structure while considering non-uniform thickness distribution. The measured thickness variations were incorporated into FEM-based structural and buckling analyses. The rib orientation, number and placement were varied to evaluate the buckling loads and deformations under axial and transverse loading. The results showed that the vertical rib model (E) improved the buckling load by 284%, while the central rib placement in the horizontal model reduced the axial and transverse deformation by 35% and 4%, respectively. The hybrid rib design (H) mitigated structural weaknesses, improving performance by 324% without increasing weight. This study provides practical guidelines for the design of lightweight PET containers by highlighting the interaction between thickness distribution and rib structure. Future studies incorporating DOE-based optimisation can further enhance lightweighting strategies for different container shapes and molding processes.
참고문헌 (11)
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