ANALISIS KETAHANAN MEKANIK DAN TERMAL HASIL CETAK TINTA SURFACE PADA BIODEGRADABLE FILM BERBASIS PATI SINGKONG

Cassava starch-based biodegradable film is an environmentally friendly packaging alternative that requires print quality evaluation due to its different surface characteristics compared to polyethylene (PE). This study aimed to analyze the effect of substrate type on the print durability of surface printing ink on PE film and cassava starch-based biodegradable film after thermal treatment. An experimental method was employed using toluene-based and non-toluene-based inks, followed by rubbing, thermal dimension, blocking, and adhesion tests based on ASTM
standards. The results showed that the biodegradable film exhibited greater dimensional shrinkage than PE film but remained within the tolerance specified by ASTM D1204. A temperature of 60°C had the greatest effect on increasing blocking and ink transfer. The adhesion test indicated a 0B rating for the biodegradable film, while the PE film achieved ratings of 4B–5B. Therefore, cassava starch-based biodegradable film has the potential to be used as an environmentally friendly flexible packaging material; however, optimization of ink formulation and surface
treatment is still required to improve its print quality.
Keywords: biodegradable film, cassava starch, print durability, surface printing ink, flexible packaging.
Biodegradable film berbasis pati singkong merupakan alternatif kemasan ramah lingkungan yang memerlukan evaluasi kualitas hasil cetak karena memiliki karakteristik permukaan yang berbeda dengan polyethylene (PE). Penelitian ini bertujuan menganalisis pengaruh jenis substrat terhadap ketahanan hasil cetak tinta surface pada film PE dan biodegradable film berbasis pati singkong setelah perlakuan suhu. Metode penelitian menggunakan pendekatan eksperimen dengan pencetakan manual menggunakan tinta toluene dan non-toluene, kemudian dilakukan pengujian rubbing test, thermal dimension test, blocking test dan adhesion test berdasarkan standar ASTM. Hasil penelitian menunjukkan bahwa biodegradable film mengalami penyusutan dimensi lebih besar dibandingkan PE, namun masih berada dalam batas toleransi ASTM D1204. Suhu 60°C menjadi kondisi yang paling memengaruhi peningkatan blocking dan perpindahan tinta. Pengujian adhesi menunjukkan biodegradable film memperoleh nilai 0B, sedangkan PE mencapai 4B–5B. Dengan demikian, biodegradable film berbasis pati singkong berpotensi digunakan sebagai kemasan fleksibel ramah lingkungan, namun masih memerlukan optimasi formulasi tinta dan perlakuan permukaan untuk meningkatkan kualitas hasil cetaknya.
Kata kunci: biodegradable film, pati singkong, hasil cetak, tinta surface, kemasan fleksibel.