
Pre-Test Coating Technology
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Professional Development
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
Manakah pernyataan yang TIDAK benar tentang fungsi binder?
Merekatkan partikel pigment antar satu sama lain.
Mengatur viskositas coating agar tetap rendah.
Membantu partikel coating melekat ke permukaan base paper.
Membantu mengisi ruang antar partikel dalam coating.
2.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
Faktor apa yang paling memengaruhi proses penetrasi coating ke base paper?
Daya sebar pigmen
Struktur pori base paper
Daya larut binder
Komposisi additives
3.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
Dalam proses dispersing, peran dispersant adalah …
Menjaga stabilitas thermal slurry coating
Menjaga agar partikel pigment terdistribusi merata dan tidak aglomerasi
Mencegah terbentuknya busa selama mixing
Mengurangi gesekan antara coating dan mesin
4.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
Bagaimana cara kerja sensitizer pada kertas thermal?
Meningkatkan reaktivitas binder agar coating tahan air
Menurunkan suhu leleh leuco dye dan developer untuk reaksi lebih cepat
Menjaga agar pewarna leuco tetap stabil pada suhu tinggi
Membentuk mikrokapsul agar pewarna tidak lepas prematur
5.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
Apa alasan teknis penggunaan biocide dalam sistem coating kitchen?
Mencegah pertumbuhan bakteri pada slurry coating yang dapat menurunkan kualitas
Meningkatkan kecepatan dispersi pigment
Mempercepat reaksi cross-linking binder
Menstabilkan nilai pH slurry pada kondisi netral
6.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
Fungsi utama dari thickener (rheology modifier) adalah...
Menstabilkan warna coating
Mengontrol viskositas dan aliran slurry
Mempercepat proses pengeringan
Meningkatkan opasitas secara kimia
7.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
Mekanisme utama terbentuknya warna pada kertas NCR dimulai dengan...
Oksidasi leuco dye oleh udara
Pelelehan developer
Kontak tekanan yang memecah microcapsule
Absorpsi warna oleh base paper
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