Paper cup sleeve manufacturer 2025: Double-layer hollow paper cups make every cup of hot drink warm but not hot! Our double wall paper cups adopt a unique hollow insulation design, which not only has excellent insulation effect, but also brings a more comfortable grip. Hot drinks are not hot and cold drinks are water-proof, which perfectly improves the user experience. Selected high-quality food-grade paper materials, the inner wall leak-proof coating and the delicate texture of the outer wall are cleverly combined. It is both practical and beautiful. It can easily…