In doing a job manually such as moving, lifting a certain material needs to be evaluated to minimize the risk of work accidents. The research that will be conducted is the evaluation of manual material handling on the removal and removal of thiners. The purpose of this study was to determine the application of work biomechanics in minimizing the risk of spinal cord injury and providing improvement in work activities. The methods used in this research are Nordic Body Map, NIOSH, Rapid Entire Body Assessment, L5 / S1 (Fc) Force and Energy Consumptions. The results of this study were found that several parts of the workers' body muscles were injured, such as the neck, left and right shoulders, arms and wrists, back and waist. The RWL and Li values after repairs where is RWL exceeded the Load Constant value of 20 kg, and the Li value <1 (no risk). Then the work category level which was originally light-moderate work changed to light work. Furthermore, the original REBA score got a score of 5 to 3 (level 1). And the results of the compressive force against L5 / S1 have values of Fc <AL and Fc < MPL.
Permasalahan yang sedang terjadi mengenai manual material handling, sebagai berikut: penanganan, pemindahan, pengepakan, penyimpanan dan pengawasan terhadap suatu objek. Hal ini dapat memengaruhi proses produksi perusahaan. Tujuan dari penelitian ini untuk melakukan pemberian usulan sistem kerja saat aktivitas manual material handling. Berupa pengangkatan dan pemindahan thiner di departement warehouse PT. XYZ. Metode dalam penelitian ini biomekanika kerja dengan menggunakan formulasi NIOSH untuk mengetahui nilai RWL serta Li. Selain itu dapat dijadikan sebagai indikator aktivitas yang memiliki resiko. Hal ini dilanjutkan dengan penambahan alat bantu seperti hand pallet dan melakukan analisis pada kondisi fisik pekerja. Hal tersebut berdasarkan konsumsi energi saat aktivitas manual material handling. Hasil evaluasi dapat diketahui bahwa nilai lifting index masing-masing pekerja adalah: Responden 1 (0,913), Responden 2 (0,958), Responden 3 (0,913), Responden 4 (0,913) dan Responden 5 (0,958). Masing-masing mengalami penurunan jika dibandingkan nilai lifting index sebelumnya. Kemudian nilai yang dikeluarkan setelah adanya perbaikan mengalami penurunan. Sehingga nilai KE adalah: Responden 1 (0,182511 kkal), Responden 2 (0,808563 kkal), Responden 3 (0,642091 kkal), Responden 4 (0,855948 kkal) dan Responden 5 (0,931425 kkal).
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