We can see all kinds of paper cups in milk tea coffee shops. Among them, the paper cups of Starbucks coffee shops are refreshing. In addition to these special paper cups, the following paper cups are mainly used in our lives: Single wall paper cup--Single wall paper cup is one of the paper cups. The main material is a wall of paper. The characteristic of the single-wall paper cup is that the wall inside the cup has a smooth PE coating or edible wax.