Western paper; Western-style paper
Refers to paper made in the Western style, as opposed to traditional Japanese paper (和紙). Used in contexts discussing paper types, crafts, or historical comparisons.
This book uses Western paper.
I research the differences between Western paper and Japanese paper.
Compound of 西洋 (Western) and 紙 (paper). The term arose to distinguish Western-style paper from traditional Japanese paper (和紙) after Western papermaking techniques were introduced to Japan.