With China's rapid economic growth, disposable paper cups-convenient for use at home or while traveling-have become essential daily consumer goods for households, restaurants, and offices. They are popular due to their varied shapes, vibrant colors, and durability (resistance to breakage). Currently, most paper cups on the market feature a single-layer design; these often suffer from low structural strength, prone to deformation when holding hot water, as well as poor thermal insulation and a lack of slip resistance. Below, we introduce the features of double-layer paper cups.

Single-layer paper cups-also known as single-sided PE-coated cups-feature a smooth polyethylene (PE) coating on the interior surface. Typically used for drinking water, they are manufactured from food-grade wood pulp paper and food-grade PE film. As the name implies, double-layer paper cups consist of two layers of material. They offer superior quality and greater durability compared to single-layer cups and are suitable for holding hot beverages, such as hot coffee.

To expand the range of applications for paper cups, straight-walled double-layer cups were introduced to the market in 1940; these were not only portable but also capable of holding hot drinks. Subsequently, manufacturers began coating the cups with latex to mask the inherent paper odor and improve leak resistance; latex-coated cups (often wax-finished) became widely used for hot coffee. The double-layer paper cup structure comprises a base and a cup body formed by an inner layer and an outer layer. Each layer features raised reinforcing ribs on its inner or outer surface-creating a textured profile-and the inner and outer cup bodies are sealed tightly against each other.