Analisis Kapabilitas Proses Produksi Kertas Di Pt. Adiprima Suraprinta

Aziz, Diva Tsabita Shabrina (2025) Analisis Kapabilitas Proses Produksi Kertas Di Pt. Adiprima Suraprinta. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Industri pulp dan kertas di Indonesia memiliki peran strategis dalam mendukung perekonomian nasional. PT Adiprima Suraprinta merupakan salah satu perusahaan di sektor ini yang memproduksi berbagai jenis kertas, salah satunya newsprint paper 44 gr/m² yang menjadi produk dengan volume produksi tertinggi. Meskipun perusahaan telah lama beroperasi, pengendalian kualitas yang dilakukan masih bersifat sederhana, yakni hanya membandingkan hasil produksi dengan batas spesifikasi tanpa mengetahui kapabilitas proses secara statistik. Penelitian ini bertujuan untuk menganalisis kapabilitas proses produksi menggunakan pendekatan multivariat terhadap karakteristik kualitas basis weight, brightness, dan opacity. Analisis dilakukan dalam dua fase, yaitu fase I (Mei) dan fase II (Juni), menggunakan peta kendali Generalized Variance dan T² Hotelling, serta perhitungan indeks kapabilitas multivariat (MCpk). Hasil analisis menunjukkan bahwa proses pada fase I berada dalam kondisi terkendali secara statistik namun belum kapabel (MCpk = 0,99). Evaluasi menggunakan diagram Ishikawa mengidentifikasi bahwa penyebab utama ketidaksesuaian kualitas berasal dari pengaturan setup dan set point mesin yang kurang tepat. Setelah dilakukan penyesuaian parameter mesin, fase II menunjukkan peningkatan nilai MCpk menjadi 1,06, yang menandakan bahwa proses telah mencapai kapabilitas serta menunjukkan presisi dan akurasi yang lebih baik terhadap spesifikasi kualitas. Penelitian ini memberikan gambaran penting bagi perusahaan dalam menerapkan pendekatan statistik untuk meningkatkan efektivitas pengendalian kualitas dan pengambilan keputusan berbasis data.
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The pulp and paper industry in Indonesia plays a strategic role in supporting the national economy. PT Adiprima Suraprinta is one of the companies in this sector that produces various types of paper, with newsprint paper 44 g/m² being one of its most frequently manufactured products. Although the company has been operating for years, its quality control practices remain basic—limited to comparing production results with specification limits—without evaluating statistical process capability. This study aims to analyze the production process capability using a multivariate approach focusing on the quality characteristics of basis weight, brightness, and opacity. The analysis was conducted in two phases, namely Phase I (May) and Phase II (June), using Generalized Variance and Hotelling’s T² control charts, along with the calculation of the multivariate capability index (MCpk). The results show that in Phase I, the process was statistically in control but not yet capable (MCpk = 0.99). An Ishikawa diagram evaluation identified improper machine setup and set point configurations as the main causes of quality deviations. After adjustments to the machine parameters were made, Phase II demonstrated improvement with the MCpk value increasing to 1.06, indicating that the process had achieved capability and showed better precision and accuracy toward quality specifications. This research highlights the importance of applying statistical methods in quality control to enhance decision-making and continuous improvement within the production process.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Ishikawa, Kapabilitas proses, Kertas koran, Peta Kendali GV, Peta Kendali T2 Hotelling
Subjects:	T Technology > TS Manufactures > TS156 Quality Control. QFD. Taguchi methods (Quality control)
Divisions:	Faculty of Vocational > 49501-Business Statistics
Depositing User:	Diva Tsabita Shabrina Aziz
Date Deposited:	23 Jul 2025 02:41
Last Modified:	23 Jul 2025 02:41
URI:	http://repository.its.ac.id/id/eprint/120675

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