| 摘要 |
PURPOSE:To exactly join moldings of different resins even when their sizes are large by a method in which the bonding portion of the first color resin molding is made smaller in thickness to form a lip portion, and the bonding end portion is deformed by collision of the resin with the lip portion of the second color resin. CONSTITUTION:When the first color resin in molten state is cast, the bonding end portion 12 of the first molding 10 is tapered with a smaller thickness than the other portions, and a lip portion 13 is formed in the bonding end portion 12. The second color resin in molten state is then cast, whereupon the resin flowing in the mold C2 collides with the lip portion 13, and thereby the bonding end portion 12 of the first molding 10 is deformed in a heaved form. The second color resin flows not only into the outside with the lip portion 13 but also into the inside to cover both the inner and outer faces of the bonding end portion 12 of the first molding 10. Each molding can thus be joined in such a way that the inner and outer faces of the bonding end portion of the first color molding are covered with the second color molding. Therefore, resin molding products having strong bonding strength can be obtained.
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