Pengendalian Kualitas Proses Produksi Kertas Grade A Menggunakan Diagram Kendali MEWMV-SSRM dan FMEA

Sahirah, Fathina (2026) Pengendalian Kualitas Proses Produksi Kertas Grade A Menggunakan Diagram Kendali MEWMV-SSRM dan FMEA. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Industri kertas di Indonesia masih memiliki peran strategis, khususnya untuk produk kertas Grade A yang menuntut kestabilan dan konsistensi kualitas yang tinggi. PT XYZ sebagai salah satu produsen kertas menghadapi permasalahan berupa variasi kualitas antar paper machine yang berpotensi menyebabkan ketidakstabilan proses produksi, terutama pada karakteristik Brightness serta warna Color L, Color a, dan Color b yang saling berkorelasi. Penelitian ini bertujuan untuk mengevaluasi kestabilan dan kapabilitas proses produksi kertas Grade A menggunakan pendekatan pengendalian kualitas statistik multivariat yang mampu memonitor variabilitas dan pergeseran rata-rata proses secara simultan. Data yang digunakan merupakan data historis kualitas kertas Grade A dari lima paper machine pada periode Juli hingga September 2025. Monitoring variabilitas proses dilakukan menggunakan diagram kendali Multivariate Exponentially Weighted Moving Variance (MEWMV), sedangkan deteksi pergeseran rata-rata proses dilakukan menggunakan diagram kendali Spatial Signed Rank Multivariate Exponentially Weighted Moving Average (SSRM) yang bersifat robust terhadap penyimpangan asumsi distribusi. Hasil analisis menunjukkan bahwa pada beberapa paper machine masih terdapat pengamatan yang berada di luar batas kendali, yang mengindikasikan ketidakstabilan proses baik dari sisi variabilitas maupun rata-rata. Selain itu, hasil analisis kapabilitas proses memperlihatkan bahwa meskipun sebagian karakteristik kualitas telah menunjukkan tingkat presisi dan akurasi yang baik, secara keseluruhan proses belum sepenuhnya kapabel dalam memenuhi batas spesifikasi yang ditetapkan. Hasil analisis Fishbone dan Failure Mode and Effects Analysis (FMEA), diperoleh bahwa penyebab utama ketidakterkendalian mutu warna kertas Grade A berasal dari faktor mesin dan manusia, dengan prioritas perbaikan tertinggi pada aspek tidak adanya sistem early warning dari Quality Control dan lambatnya respons operator terhadap perubahan proses.
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Paper industries in Indonesia still play a strategic role, especially for Grade A paper products that require high stability and consistency in quality. PT XYZ, as one of the paper manufacturers, faces problems in the form of quality variations between paper machines that have the potential to cause instability in the production process, especially in the characteristics of Brightness and Color L, Color a, and Color b, which are correlated. This study aims to evaluate the stability and capability of Grade A paper production processes using a multivariate statistical quality control approach that can simultaneously monitor process variability and mean shifts. The data used is historical data on Grade A paper quality from five paper machines for the period July to September 2025. Process variability is monitored using the Multivariate Exponentially Weighted Moving Variance (MEWMV) control chart, while process mean shifts are detected using the Spatial Signed Rank Multivariate Exponentially Weighted Moving Average (SSRM) control chart, which is robust against distribution assumption. The results show that in several paper machines there are still observations that are outside the control limits, indicating process instability in terms of both variability and average. In addition, the process capability analysis results show that although some quality characteristics have demonstrated good precision and accuracy, overall the process is not yet fully capable of meeting the specified limits. Based on the Fishbone analysis and Failure Mode and Effects Analysis (FMEA), the main causes of color quality instability in Grade A paper are attributed to machine and human factors, with the highest improvement priority related to the absence of an early warning system from Quality Control and the slow operator response to process changes.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	FMEA, Kapabilitas Proses, Kualitas Kertas, MEWMV, SSRM FMEA, MEWMV, Paper Quality, Process Capabilities, SSRM
Subjects:	T Technology > TS Manufactures T Technology > TS Manufactures > TS156 Quality Control. QFD. Taguchi methods (Quality control)
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Statistics > 49201-(S1) Undergraduate Thesis
Depositing User:	Fathina Sahirah
Date Deposited:	29 Jan 2026 07:33
Last Modified:	29 Jan 2026 07:33
URI:	http://repository.its.ac.id/id/eprint/131009

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