Insert molding refers to the molding method in which the mold is filled with pre-prepared foreign material inserts and then injected with resin, and the molten material is joined with the inserts and cured to make an integrated product.

Injection molding on the substrate refers to the method of inserting the molded parts into the metal surface.

The above two molding methods are essentially the same. Their characteristics are as follows:

1. The combination of the ease of molding and bending of resin and the rigidity, strength and heat resistance of metal can make complex and delicate metal-plastic integrated products.

2. In particular, the combination of the insulating properties of resin and the electrical properties of metal enables the molded products to meet the basic functions of electrical products.

3. The prior molding combination of multiple inserts makes the post-engineering of the product unit combination more rational.

4. Insert products are not limited to metal, but also include cloth, paper, wire, plastic, glass, wood, wire coils, electrical parts, etc.

5. For rigid molded products and flexible molded products on rubber gaskets, the complex work of arranging the sealing coils can be eliminated by injection molding on the substrate to make an integrated product, which makes it easier to automate the post-process assembly.

6. Since the molten material is joined to the metal insert, the gap between the metal insert can be designed to be narrower than that of the press-in molding method, and the composite product can be molded with higher reliability.