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In most cases injection mold shop will end up making "acceptable" parts by "shrink fixing" it. There goes all profit and residual stress is introduced.
Product design and mold flow analysis In the process of product design, mold flow analysis software is used to work out best point of the flow. At the same time, to minimize cooling effect, cycle time, warping problems of the product, thus avoiding deformation, welding mark, shrinkage problem. Every important assembling part will be...
As we known, the auto business develop very quickly in past ten year, more and more newest go to the market, lots of automotive components are made from plastic, that means it need large amount of molds made.
Crystalline material needs time as more as possible to process its micro-structural crystallization. For injection molding part with crystalline material, the skin layer is at the status more like amorphous because material wherein is directly contact injection mold and cooled by injection mold temperature so fast that time is not enough...
We all know that the skin layer in a molded part with PP is less crystalline than the core in a PP injection molded component. Could you please explain the mechanism behind why it happens?
So you need to take care also of the weather humidity and try to simulate first, and have a good test, maybe later you can share us which test or procedure was better to improve your shrinkage.
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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