| 摘要 |
PROBLEM TO BE SOLVED: To subject the adhesive surface between a resin molding and rubber of a product obtained by vulcanizing rubber and bonding the vulcanized rubber to the resin molding to a surface treatment into the most suitable surface roughness without damaging the resin molding. SOLUTION: A melamine-based resin having a color different from that of the resin molding 11 to be treated is processed into a sharp polygonal granular state having about 100-5,000 μm size to give a projection material 21, which is thrown into a projection material feeder 22 of a blasting apparatus 20. The projection material 21 is sprayed on and hit to an inner wall 11S of the resin molding 11 to be the adhesive surface by a blast nozzle 23 to blast the inner wall 11S. |
