“…The fiber gaps of cellulose in the base paper were easily absorbed by liquid water or oil via capillary action on the surface of the base paper. Hence, a part of the coating solution was absorbed by the pores( Priyadarshi, Riahi, & Rhim, 2024 ). Therefore, PP paper and PP/TTO paper cross-section fibers were in a bonding state, which indicates the uniform distribution of the coating solution.…”