PRODUCT HAVING TRACEABILITY DISPLAYED THEREON AND METHOD FOR DISPLAYING TRACEABILITY OF PRODUCT

摘要

After the main body 11 is manufactured by PBN, the traceability indication 12 is provided as a sintered graphite on any portion of the surface of the main body. The surface of the main body including the traceability mark is covered with the PG film 13 , The PG coat product 14 is produced. When the thickness of the PG film is 100 m or less, preferably 80 m or less, it is very suitable as a traceability display technique because transparency sufficient to read the product serial number displayed on the surface of the main body can be obtained. Since graphite does not adversely affect the physical properties of PBN or PG, the inherent function and durability of the product are not impaired even when the traceability mark formed by using the graphite intervenes between the PBN surface of the main body and the PG film. Similarly, the PBN overcoat article 24 may be produced by coating a PBN film 23 having a film thickness of 700 m or less, preferably 500 m or less, on the surface of the main body 21 provided with the traceability mark 22 as the refined graphite This is a very suitable traceability indication technique.