Understanding warpage

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  • čas přidán 4. 04. 2018
  • Warpage are calculated once the part has reached room (ambient) temperature. This calculation begins once the cavity is filled with plastic and is based on the difference between the current pvT (pressure/volume/temp) and reference state.
    As the mass of an element changes (for example, with polymer flow during packing), shrinkage continues to change with each change in the element's pvT state. Once the mass stops changing, the element's current pvT state is fixed in the shrinkage calculation as the reference state. The mass of an element stops changing when the cavity pressure has decayed to zero. After this, the volumetric shrinkage becomes a constant.

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