Paper cores are typically used as a support structure for materials such as plastic films, papers, fabrics, and tapes. They provide stability and protection to these materials during transport and storage. Paper cores are also used in the manufacturing of rolls of paper, plastic film, and other similar products. 

Paper spools, on the other hand, are used for winding and unwinding materials such as wires, strings, threads, and yarns.

They are commonly used in the textile industry for storing and transporting thread and yarn. They are also used in the manufacturing of electronic components and various other products. Both paper cores and paper spools come in various sizes, lengths, and diameters to accommodate different materials and applications.