Seamless Aluminum Plastic Composite (APC) signboards are a type of signage material that combines the durability of aluminum with the flexibility and ease of printing on plastic. They are commonly used in outdoor advertising due to their weather-resistant properties and attractive appearance. The signboard is made by bonding a thin layer of aluminum to a plastic core, which is then coated with a decorative layer and finished with an adhesive backing. This construction allows for a smooth, seamless look and a wide range of design possibilities.