With the development of plastic industry, more and more plastic parts adopt two kinds of material for production. At present, there are two design methods for such kind of mold. The first one is two shot mould, also called as double injection mold. That’s to say, in the same mold, there are two nozzles, one is for injection the relatively hard material and the other is for injection the soft material. This injection technology is also named as two shot molding.
The second one is over mold. This kind of mould needs artificial assistance for operating. Firstly inject the relatively hard material, then take out the molded parts manually, and put it into the other cavity to inject the soft material. Some mold manufacturer make it into two separated molds, however ,such kind of over mould has its disadvantage which is that it requires manual operation. Certainly the mold cost will be Lower than two shot mould. EVE suggest that if you need mass production for molding, you would better choose the double injection mold.