Analisis Kapabilitas Proses Produksi Plastik di PT. XYZ Menggunakan Multivariate Exponentially Weighted Moving Average

Pratama, Daffa Putra (2026) Analisis Kapabilitas Proses Produksi Plastik di PT. XYZ Menggunakan Multivariate Exponentially Weighted Moving Average. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Cast Polypropylene (CPP) digunakan secara luas sebagai bahan kemasan fleksibel makanan dan farmasi karena memiliki sifat barrier yang baik terhadap uap air dan oksigen. PT. XYZ sebagai produsen CPP memiliki tanggung jawab untuk menjaga kualitas produk, khususnya pada produk unggulan Plastik CPP jenis A. Dua karakteristik kualitas utama yang menjadi perhatian adalah Water Vapor Transmission Rate (WVTR) dan Oxygen Transmission Rate (O₂TR). Berdasarkan data laboratorium Quality Control tahun 2024, sebesar 21% dari total output CPP jenis A dinyatakan tidak sesuai spesifikasi sehingga harus dilakukan pengolahan ulang. Penelitian ini bertujuan untuk menganalisis kapabilitas proses produksi plastik CPP jenis A menggunakan pendekatan multivariat. Pengujian dilakukan terhadap karakteristik kualitas WVTR dan O₂TR menggunakan peta kendali Multivariate Exponentially Weighted Moving Average (MEWMA) untuk memantau kestabilan proses, kemudian dilanjutkan dengan perhitungan indeks kapabilitas proses multivariat menggunakan MPCncv, serta analisis diagram sebab-akibat untuk mengidentifikasi faktor penyebab ketidaksesuaian produk. Hasil penelitian menunjukkan bahwa nilai komponen MPCncv pada fase I sebesar 1,058 dan 2,3027 serta meningkat pada fase II menjadi 1,137 dan 4,5654 dengan komponen menggambarkan presisi dan komponen 2 akurasi, hal tersebut mengindikasikan bahwa proses produksi telah kapabel secara multivariat. Meskipun demikian, masih ditemukan beberapa kendala produksi yang dipengaruhi oleh faktor mesin, manusia, dan pengukuran yang berpotensi memengaruhi stabilitas proses dan kualitas produk.
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Cast Polypropylene (CPP) is widely used as a flexible packaging material for food and pharmaceutical products because it has good barrier properties against water vapor and oxygen. PT. XYZ, as a CPP producer, is responsible for maintaining product quality, especially for its flagship product, CPP Plastic Type A. Two main quality characteristics that receive special attention are the Water Vapor Transmission Rate (WVTR) and the Oxygen Transmission Rate (O₂TR). Based on laboratory data from the Quality Control department in 2024, about 21% of the total output of CPP Type A did not meet the specifications and therefore had to be reprocessed. This study aims to analyze the capability of the CPP Type A production process using a multivariate approach. Testing was conducted on the WVTR and O₂TR quality characteristics using the Multivariate Exponentially Weighted Moving Average (MEWMA) control chart to monitor process stability. This was followed by the calculation of the multivariate process capability index using MPCncv, and a cause-and-effect diagram analysis to identify the factors causing product nonconformity. The results show that the MPCncv component values in Phase I were 1.058 and 2.3027, and they increased in Phase II to 1.137 and 4.5654. Component 1 represents precision, while Component 2 represents accuracy. These results indicate that the production process is multivariately capable. However, several production constraints were still identified, mainly related to machine, human, and measurement factors, which may influence process stability and product quality.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Process Capability, Water Vapor Transmission Rate (WVTR), Oxygen Transmission Rate (O2TR), MEWMA, Fishbone. Kapabilitas Proses, Water Vapor Transmission Rate (WVTR), Oxygen Transmission Rate (O2TR), MEWMA, Fishbone.
Subjects:	T Technology > TS Manufactures > TS156 Quality Control. QFD. Taguchi methods (Quality control)
Divisions:	Faculty of Vocational > 49501-Business Statistics
Depositing User:	Daffa Putra Pratama
Date Deposited:	16 Mar 2026 03:30
Last Modified:	16 Mar 2026 03:30
URI:	http://repository.its.ac.id/id/eprint/132720

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