KARAKTERISASI KUALITAS CETAK TINTA OFFSET MAGENTA BERBASIS MINYAK KELAPA SAWIT PADA MATERIAL KEMASAN

This study analyzes the print quality characteristics (viscosity and color density), physical resistance (rub resistance and tape resistance), and chemical stability of palm oil-based magenta ink on paperboard and synthetic matte paper substrates using a quantitative experimental method with an IGT offset printing machine, with results showing an average ink viscosity of 1.036 Poise that remained consistent, a color density on paperboard (1.534) higher than on synthetic matte paper (1.330) due to its more porous surface, a density loss in the rub test of 6.23% for paperboard and 12.78% for synthetic matte paper, very strong adhesion in the tape test on paperboard resulting in fiber tear while synthetic matte paper only experienced ink peeling, as well as NaOH and HCl as the most destructive chemical agents on both substrates while detergent had the mildest impact with synthetic matte paper showing better stability against it, so that overall paperboard proved most optimal in terms of print quality, physical resistance, and color reproduction, while synthetic matte paper excelled in detergent resistance and substrate integrity under acid exposure, and these findings are expected to serve as a reference for the packaging printing industry in selecting optimal and sustainable combinations of vegetable-based ink and substrates.
Keywords: magenta ink, palm oil, paperboard, synthetic matte paper, print quality, physical resistance, chemical stability

Penelitian ini menganalisis karakteristik kualitas cetak (viskositas dan densitas warna), ketahanan fisik (rub resistance dan tape resistance), serta stabilitas kimia tinta magenta berbasis minyak kelapa sawit pada substrat paper board dan synthetic matte paper menggunakan metode kuantitatif eksperimental dengan mesin cetak offset IGT, dengan hasil menunjukkan viskositas tinta rata-rata 1,036 Poise yang konsisten, densitas warna paper board (1,534) lebih tinggi dibanding synthetic matte paper (1,330) akibat permukaannya yang lebih porous, kehilangan densitas pada rub test sebesar 6,23% untuk paper board dan 12,78% untuk synthetic matte paper, daya rekat tape test yang sangat kuat pada paper board hingga menyebabkan fiber tear sementara synthetic matte paper hanya mengalami pengelupasan tinta, serta NaOH dan HCl sebagai agen kimia paling destruktif pada kedua substrat sedangkan detergen berdampak paling ringan dengan synthetic matte paper menunjukkan stabilitas lebih baik terhadapnya, sehingga secara keseluruhan paper board terbukti paling optimal dari sisi kualitas cetak, ketahanan fisik, dan reproduksi warna, sedangkan synthetic matte paper unggul dalam ketahanan detergen dan keutuhan substrat saat terpapar asam, dan temuan ini diharapkan menjadi referensi bagi industri percetakan kemasan dalam memilih kombinasi tinta nabati dan substrat yang optimal serta berkelanjutan.
Kata kunci: tinta magenta, minyak kelapa sawit, paper board, synthetic matte paper, kualitas cetak, ketahanan fisik, stabilitas kimia