NUGROHO, SURYO ADHI (2026) RANCANG BANGUN AUTOMATIC BLOWDOWN SYSTEM PADA PANEL MESIN CURING SEYEN DI PT XYZ UNTUK MENURUNKAN SCRAP SIDE BARE. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Each company has indicators to guarantee product quality, which are calculated based on the number of defects. At PT XYZ which produces motorcycle tires there are always defects or product defects, one of the highest scrap defects is side bare, which is a defect in the sidewall of the motorcycle tire. This side bare scrap defect is highest in tire size X. It is known that the side bare defect occurs due to two things, namely from the material and the machine. From the machine factors taken from the curing machine, this side bare scrap defect is caused by a less than optimal shaping process due to the presence of water content in the air during the curing process. In addition, the water content also causes damage to the solenoid and regulator on the curing machine panel. As a solution, an automatic blowdown system is needed to remove water in the air automatically. This study aims to design a PLC and HMI-based control system to remove water content in the air pipe that causes damage to the solenoid valve and regulator. The test results show that the system was successfully designed and implemented, and has an influence in reducing the scrap side bare defect on size X in the ITC 07.09 curing machine. Where in the previous 3 months the average scrap side bare defect was 73 pcs, and after installing the automatic blowdown system the average scrap side bare 3 months later was 8 pcs. From these results, the automatic blowdown system has a very big influence on the scrap side bare defect on motorcycle tires, where this system can maintain the performance of the solenoid valve and regulator so that it can reduce the scrap side bare defect. Keywords: Automatic Blowdown System, Curing, Defect Side Bare. Setiap perusahaan memiliki indikator untuk menjamin kualitas produk, yang dihitung berdasarkan jumlah defect. Di PT XYZ yang memproduksi ban sepeda motor selalu ada hasil defect atau cacat produk, salah satu defect scrap tertinggi adalah side bare, yang merupakan cacat pada ban motor bagian sidewall. Defect scrap side bare ini tertinggi pada pada size ban X Diketahui bahwa defect side bare terjadi akibat dua hal yaitu dari material dan mesin. Dari faktor mesin yang diambil pada mesin curing, defect scrap side bare ini disebabkan oleh proses shaping yang tidak maksimal karena adanya kandungan air dalam angin pada proses curing. Selain itu, kandungan air juga menimbulkan kerusakan pada solenoid valve dan regulator di panel mesin curing. Sebagai solusi, diperlukan automatic blowdown system untuk membuang air dalam angin secara otomatis. Penelitian ini bertujuan untuk merancang bangun sistem kontrol berbasis PLC dan HMI untuk membuang kandungan air yang ada di dalam pipa angin yang menyebabkan kerusakan selenoid valve dan regulator. Hasil pengujian menunjukkan sistem berhasil dirancang dan diterapkan, dan memiliki pengaruh dalam menurunkan defect scrap side bare pada size X di mesin curing ITC 07.09. Dimana pada 3 bulan sebelumnya rata rata defect scrap side bare yaitu 73 pcs , dan setelah di pasang alat automatic blowdown system rata rata scrap side bare 3 bulan setelahnya yaitu 8 pcs. Dari hasil ini automatic blowdown system ini sangat berpengaruh pada defect scrap side bare pada ban sepeda motor, dimana sistem ini dapat menjaga kinerja dari selenoid valve dan regulator sehingga dapat mengurangi defect scrap side bare. Kata Kunci : Automatic Blowdown System, Curing, Side Bare.
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