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The aim of this study is to improve the lifting process for 25 kg boxes vertically stacked on pallets, with consideration for the inclusion of female workers as per labor regulations. Utilizing the National Institute for Occupational Safety and Health (NIOSH) Composite Lifting Index (CLI) through Digital Human Modeling (DHM), the risk of musculoskeletal disorders (MSDs) from a single worker lifting, who performs 6 lifts per hour and works 8 h a day, was evaluated. The CLI for a single worker was determined to be 3.93, with recommend weight limit of 6.36 kg according to DHM. The study compared three lifting methods: Two-person manual lifting resulted in a CLI of 1.97, indicating a moderate risk of injury. Pre-leveling equipment before single lifting led to a CLI of 2.77, though this approach may extend lifting time. Lastly, spring balancer assistance resulted in a CLI of 0.47, indicating maximum safety but requiring investment in installation. In conclusion, the analysis suggests that process efficiency can be boosted by up to 55 lifts per hour, reducing cycle time and workers. Moreover, the carbon footprint of the facilities was calculated, indicating a reduction of 0.96 tons of CO2 emissions per year compared to other options. This reduction significantly contributes to the establishment of a green manufacturing.

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Enhancing Packing Processes Through an Ergonomic Worker Study Using Digital Human Modeling and Environmental Assessment

  • 会议论文

  • 发表日期：

    2025年

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  • Pratzanee Sungkaratn,
  • Chootrakul Siripaiboon

摘要

The aim of this study is to improve the lifting process for 25 kg boxes vertically stacked on pallets, with consideration for the inclusion of female workers as per labor regulations. Utilizing the National Institute for Occupational Safety and Health (NIOSH) Composite Lifting Index (CLI) through Digital Human Modeling (DHM), the risk of musculoskeletal disorders (MSDs) from a single worker lifting, who performs 6 lifts per hour and works 8 h a day, was evaluated. The CLI for a single worker was determined to be 3.93, with recommend weight limit of 6.36 kg according to DHM. The study compared three lifting methods: Two-person manual lifting resulted in a CLI of 1.97, indicating a moderate risk of injury. Pre-leveling equipment before single lifting led to a CLI of 2.77, though this approach may extend lifting time. Lastly, spring balancer assistance resulted in a CLI of 0.47, indicating maximum safety but requiring investment in installation. In conclusion, the analysis suggests that process efficiency can be boosted by up to 55 lifts per hour, reducing cycle time and workers. Moreover, the carbon footprint of the facilities was calculated, indicating a reduction of 0.96 tons of CO2 emissions per year compared to other options. This reduction significantly contributes to the establishment of a green manufacturing.