- Harris designed his offset press around a rotary letterpress machine.It used a metal plate bent around a cylinder at the top of the machine that pressed against ink and water rollers.

• + 在胶印过程中，印刷油墨的渗透性主要取决于连结料自身的性质，同时也与印刷压力、印刷速度及其所用纸张的类型、表面性质等有关。