Conversion result

Using this result

Premature conversion is a typical molding problem and occurs when the material solidifies (cures) in the mold cavity before the curing phase is complete. If the material pre-cures, you will see an acceleration of the melt, followed by strong hesitation, that is, viscosity suddenly decreases because material is too hot, then abruptly increases as material pre-cures.

If pre-cure occurs, increase the specified curing time until conversion throughout the entire part reaches the recommended Ejection conversion value for the material.

TipThis value is provided in the material database. To find the Ejection conversion value, right-click on the selected material in the Study Tasks pane, then select Details... Recommended Processing (tab).

Normalized thickness values range from 0 to 1, where 0 is the center of the part and 1 is the plastic/metal interface (mold wall). The Conversion result shows the degree of cure at the selected normalized part thickness.

Select the normalized thickness by right-clicking on the Conversion result in the Study Tasks pane, select Properties Animation (tab), and select the required thickness in the Normalized Thickness drop-down list.

Things to look for

Pre-cure

Increase cure time or decrease melt and/or mold temperature and re-run. Longer cure times impart more heat resistance and a longer life to the product.

Flow rate

If the flow rate is too high, the material will shear heat and conversion will have progressed too much when material enters the mold. This will cause the material to cure completely too early.