| 摘要 |
PURPOSE:To make components of a wrist watch thin by ensuring a sufficient water proofing effect simply with a light compression on a film formed on the surface of a packing body from a fatty acid based polyamide resin having an ether bonding. CONSTITUTION:A resin film 2 is formed on the surface of a packing body 1. The resin film is produced as follows: The packing body 1 is emmersed into a solution of a fatty acid-based polyamide resin having an ether bonding. Then, it is withdrawn from the solution and dried. |
