DOI: https://doi.org/10.14710/jpii.2026.32301

Konfigurasi Desain Twin-Screw untuk Meningkatkan Dispersi Pigmen pada Colored-Masterbatch

*Ivan Andrias  -  Program Studi Program Profesi Insinyur Fakultas Teknik, Universitas Diponegoro, Jl. Prof. Sudarto, SH, Tembalang, Semarang, Indonesia 50275, Indonesia
Didi Dwi Anggoro  -  Program Studi Program Profesi Insinyur Fakultas Teknik, Universitas Diponegoro, Jl. Prof. Sudarto, SH, Tembalang, Semarang, Indonesia 50275, Indonesia
Luqman Buchori  -  Program Studi Program Profesi Insinyur Fakultas Teknik, Universitas Diponegoro, Jl. Prof. Sudarto, SH, Tembalang, Semarang, Indonesia 50275, Indonesia
Received: 4 Mar 2026; Revised: 26 Apr 2026; Accepted: 28 Apr 2026; Available online: 30 Apr 2026; Published: 8 Sep 2026.

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Abstract

Masterbatch berperan penting dalam proses pewarnaan plastik, namun pencapaian dispersi pigmen yang merata masih menjadi tantangan, terutama pada formulasi dengan kandungan pigmen tinggi. Aglomerasi pigmen dapat menurunkan kualitas visual serta memengaruhi sifat reologi dan fungsional material. Penelitian ini bertujuan untuk menentukan konfigurasi desain twin-screw extruder yang paling efektif dalam meningkatkan kualitas dispersi pigmen pada masterbatch berbasis HIPS (High-Impact Polystyrene) dengan kadar pigmen sekitar 45,3%. Sebanyak enam variasi konfigurasi screw diuji melalui kombinasi desain elemen ulir dan kecepatan putar yang berbeda. Kualitas dispersi dievaluasi menggunakan pengujian kadar abu, tekanan diferensial (ΔP) pada uji filter, pengamatan visual titik pigmen pada lembaran hasil pengepresan, serta pengujian Melt Flow Rate (MFR). Hasil penelitian menunjukkan bahwa seluruh konfigurasi memenuhi batas kadar abu sesuai formulasi, tetapi kualitas dispersi pigmen berbeda secara signifikan. Konfigurasi screw ke-4 pada kecepatan 250 rpm dan suhu barrel hingga ±265°C memberikan kinerja dispersi terbaik dengan tekanan diferensial rendah, jumlah aglomerat minimal, serta nilai MFR yang masih sesuai spesifikasi proses. Temuan ini menunjukkan bahwa keseimbangan fungsi conveying dan kneading dengan pengaturan kecepatan dan suhu yang tepat berperan penting dalam menghasilkan dispersi pigmen yang homogen.

 

Kata kunci: twin-screw extruder, dispersi pigmen, colored-masterbatch, HIPS (high-impact polystyrene), konfigurasi screw, melt flow rate (MFR)

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