Microcellular Properties dialog
This dialog is used to enter specific data about the supercritical fluid you are using in your microcellular injection molding process.
| Widget | Explanation |
|---|---|
| Name of the custom gas (Custom gas only) | If you selected Custom as the Microcellular foaming gas, enter the name of the gas here. |
| Molecular weight of gas (Custom gas only) | If you selected Custom as the Microcellular foaming gas, enter the molecular weight of the gas (in Daltons) here. |
| Surface tension (Guggenheim model) | When the fitted classical bubble nucleation model is selected, the Guggenheim model is used to describe the surface tension. This model takes into account the fact that the surface tension reaches 0 at the critical temperature. SIGM0 is a constant for each material. Enter the value for the material you are using. 1/ Tc, where 1/Tc is the critical temperature. |
| Viscosity coefficients for gas | The dissolution of gas into the polymer melt will impact the viscosity model used for microcellular injection molding. This model is used for both bubble nucleation models. Enter the three data-fitted viscosity coefficients, v1, v2 and v3. |
| Solubility coefficients for gas | The solubility of the gas into the polymer melt can affect both the viscosity of the melt and the bubble size in the finished product. This gas solubility model is used for both bubble nucleation models. Enter the two data-fitted solubility coefficients, k1 and k2. |
| Diffusion coefficient for gas | The gas that was dissolved in the polymer melt in the initial step of the microcellular injection molding process will diffuse out of the melt in the foaming stage, nucleating and growing bubbles in the process. This gas diffusion model is used for both bubble nucleation models. Enter the two data-fitted diffusion coefficients, d1 and d2. |
| Nucleation model | The Fitted Classical Nucleation Model describes the bubble nucleation rate per unit volume and time. Enter the two data-fitted coefficients, F1 and F2. |