Injection mold design considerations have?

Is the molten plastic injection tooling using pressure into the plastic mould, injection cooling molding get all kinds of plastic parts process. Should be considered in the design of plastic injection moulds, roughly classified into the following several aspects:
1, understand the flow behavior of plastic melt, considering plastic throughout the runner and cavity flow resistance, flow velocity, check the flow of the largest length. According to the flow direction (inside the plastic in the mold The molding order) , considering the plastic in the mold to the fusion and cavity within the original air export problem.
2, considering the cooling process of plastic shrinkage and feeding problems.
3, through the mould design to control the plastic in the mold of crystallization, orientation, and improve the internal stress of plastics products.
4, gate and parting surface selection problem.
5, parts of horizontal parting core-pulling and ejection of the problem.
6, mold cooling or heating problems.
7, mold size and the relationship of injection machine used, including the maximum number of injection and injection machine, clamping force, the size of the mould parts, etc.
8 shape of overall structure, mould and parts to simple and reasonable, plastic injection mould should have appropriate machining precision, surface roughness, strength and stiffness, easy to manufacture and assembly.