Soft plastics are much more flexible than hard plastics. Therefore, the ability of soft plastics to compress and store pressure is much stronger than hard plastics. The reason for the shrinkage problem of injection molded parts is that the space left when the melt condenses and shrinks cannot be replenished by the melt. Since the soft plastic can continue to compress after the cavity is shot, that is to say, higher pressure and more melt can be stored in the cavity, so the cavity does not allow the melt from the gate direction Replenishment, the stored pressure and melt are also sufficient for self-replenishment, so the shrinkage problem of soft plastic parts is easier to solve, only need to give enough pressure and time for injection.
Sometimes you will see such a situation. When the pressure is too high, the PVC soft plastic parts will not only shrink, but even expand.
The ability of hard plastics in this respect is much worse. When the gate is condensed and sealed, the pressure and melt stored in the cavity are not enough to fill the space left after the melt condenses and shrinks. The replenishment of the gate direction has become an important source of rigid plastic parts shrinkage.
It can be seen that the shrinkage problem of hard plastic parts is easier to produce than soft plastics, and the thicker the injection molded parts, the harder the problem is solved, and the soft plastic parts need not worry about this problem.
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