Absorb ink to prevent pollution. Felt has strong water absorption. When the ink is too heavy or too hard, it will not let the written words penetrate the paper and pollute the whole word or painting, and the ink will dye the table and other places.
Plain. Felt has elasticity, better adhesion to paper, and easy to keep paper flat.
Will the ink on rice paper be printed on the felt?
Under normal circumstances, it won't, because rice paper has strong ink absorption.
Too much ink or too much force will be printed on the felt from the paper, and the felt only plays its due protection role.