The design requirements:
1.must understand the product structure, color combinations and special requirements, in order to determine molding injection molding machine selection and design of the die structure.
2.in order to make two kinds of plastic stick more tightly, in addition to considering whether to use the same material, can also add a trench in the first product to increase the bonding strength.
3.select the molding equipment to check the injection system of injection volume, rotating disk channel configuration and stroke, bearing weight.
4.mold design, can put the gate design a product into the next two product coverage, and at the same time, because of a die usually only from the channel and does not take the best products, and no ejection process products, so a common point gate or gate runner and gate, which can automatically fall off without top the product. In the design of the second times of injection molding cavity, in order to avoid scratching the first has good molding products, can design some avoid empty part, at the same time to avoid the second times of injection molding material flow impact first has molded product to shift deformation. Because the core side must be rotated 180 degrees, so the core position must be cross symmetrical arrangement, also check and ensure that rotary clamping must agree. The cooling water channel two cavity and the core is set to full, balanced, consistent.
5.in general, double color molding is the first injection molding products, hard plastic parts, and then soft plastic injection molding products, part. But also consider the material temperature has two injection molding, to avoid the second material temperature is too high, the damage first molding products.