Mold Best Assurance Company Limited
* Identification Part identification is usually set on the flat internal surface of the product and is convex; choosing a face that may be consistent with mold opening direction to set identification to avoid pulling.
* Core-pulling and slide of injection mold 1. When plastic parts cannot be separated smoothly according to the mold opening direction, core-pulling and slide should be designed. Core-pulling and slide can help mold products with complex structure...
* Rib 1. The rational application of rib can increase product rigidity and reduce deformation. 2. Thickness of rib ≤（0.5～0.7）product stock thickness to avoid pinsink mark on surface. 3. Bosseyed angle of rib＞1.5° to avoid bad ejection.
At the beginning of the mold design, mold opening direction and parting line should be determined in the first place in order to minimize the influence of core-pulling slide and parting line on the appearance.
It is a cyclically fluctuating parameter with each injection cycle and will vary from point-to-point over the entire pair of injection mold surfaces. This is why mold-filling and cooling simulation is such a great tool and does give a fantastically useful insight into what actually happens throughout each cycle.
Two different internal cavities, connected two nozzles, injected respectively with different colors or different plastic materials;
Not only injection mold temperature determines melt temperature as it moves quickly through the mold. The melt temperature itself as it starts its journey through the injection mold (self-evidently) is the reference point. Speed of injection, particularly in thin sections, is of huge influence, as it will determine the degree of shear heating.
Many engineering materials like PBT (Polybutylene terephthalate) have a tendency of out-gassing. The best practices that I have to date are: Add 10mm wide vents spaced 30mm from each other all the way around parting line. Always follow the recommendations of the material company for vent depth.
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