PENGARUH SUHU DAN KONSENTRASI DEVELOPER TERHADAP KUALITAS PLATE PADA PROSES CTP MENGGUNAKAN SPECTRODENSITOMETER DI PT XYZ

ABSTRACT
The developing stage in the Computer-to-Plate (CTP) process is a critical step in offset printing prepress, where image and non-image areas are formed on the plate through chemical reactions. Developer temperature and concentration are the two primary parameters governing this process. Unstable temperatures or incorrect concentrations can lead to under-developing or over-developing, resulting in inconsistent plate quality. This final project aims to analyze the influence of developer temperature and concentration on plate quality during the CTP process. A descriptive method involving direct observation was employed, utilizing developer temperature variations of 13–33°C and concentration settings of 80–91 mS, with a processor speed of 20 seconds. The results indicate that optimal plate quality was achieved at a temperature of 23°C and a concentration of 86 mS, yielding sharp images and clean non-image areas without signs of under developing or over-developing. These parameters are recommended as standards
to ensure plate quality and the stability of the developing process.
Keywords: Computer to Plate (CTP), developing process, developer temperature, developer concentration, plate quality.

ABSTRAK
Tahap developing dalam proses Computer to Plate (CTP) merupakan langkah kritis pada prepress cetak offset yang membentuk area image dan non-image pada plate melalui reaksi kimia. Suhu dan konsentrasi developer merupakan dua parameter utama yang mengendalikan proses ini. Suhu yang tidak stabil atau konsentrasi yang tidak tepat dapat menyebabkan under-developing maupun over-developing
sehingga kualitas plate menjadi tidak konsisten. Tugas akhir ini bertujuan menganalisis pengaruh suhu dan konsentrasi developer terhadap kualitas plate pada proses CTP. Metode yang digunakan adalah deskriptif melalui pengamatan
langsung dengan variasi suhu developer 13–33°C dan konsentrasi 80–91 mS pada kecepatan processor 20 detik. Hasil menunjukkan kualitas plate terbaik diperoleh
pada suhu 23°C dan konsentrasi 86 mS yang menghasilkan image tajam, area nonimage bersih, serta tanpa gejala under-developing maupun over-developing. Parameter tersebut direkomendasikan sebagai standar untuk menjaga kualitas plate dan kestabilan proses developing.
Kata Kunci: Computer to Plate (CTP), proses developing, suhu developer, konsentrasi developer, kualitas plate.