Analisa Variasi Cutting Proses Sebelum Multi Step Polishing Terhadap Ketebalan dan Glossiness Hasil Pengecatan Steel Plate Cold Rolled Coiled (SPCC)

Maulana, Filbert Izdhihar (2026) Analisa Variasi Cutting Proses Sebelum Multi Step Polishing Terhadap Ketebalan dan Glossiness Hasil Pengecatan Steel Plate Cold Rolled Coiled (SPCC). Undergraduate thesis, Politeknik Negeri Jember.

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Abstract

Paint surface quality is one of the factors that determines the aesthetic value and overall quality of automotive painting. In the multi-step polishing process, the pre- preparation stage is generally performed by sanding to remove surface defects before polishing. However, this process requires more time and may reduce the thickness of the clear coat. This study aimed to analyze the effect of cutting pre- preparation variations on processing time, glossiness, and paint coating thickness of Steel Plate Cold Rolled Coiled (SPCC). A quantitative experimental method was used by comparing two treatments: sanding with P1000 sandpaper (Panel A) and the use of heavy cut compound red without sanding (Panel B). The results showed that Panel B reduced processing time by 48%, achieved the highest glossiness value of 93.26 GU at a 20° angle, and maintained paint coating thickness better than Panel A. Therefore, heavy cut compound is a more efficient alternative for the pre- preparation stage

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