| 摘要 |
PROBLEM TO BE SOLVED: To identify even paper cups which are likely to deform and be contaminated so that reliable depositing can be attained to improve a collection ratio for reuse of resources by including, at an appropriate portion of a container, a magnetic information medium which generates vibration waves of specific frequency due to magnetic resonance inherent to an electromagnetic beam. SOLUTION: A material for a paper cup 1 comprises a paper material with polyethylene coated on an internal surface. When a barrel of the cup 1 is to be formed, portions to be glued to each other of a barrel component 1a are hot-welded across amorphous fibers 3, thereby providing the paper cup 1 with the amorphous fibers 3 interposed between the portions. The amorphous fibers 3 to be used may include a Co-based amorphous magnetic wire with a thickness of 1 to 10 μm and length of approximately 20 to 30 mm. The wire should cause inherent magnetic resonance according to the thickness and length of the fibers 3 when the wire passes through an electromagnetic beam, and vibration waves of specific frequency at this time are received to allow identification. |
