The effect of pressurized and fast stabilization on one step batch foaming process for the investigation of cell structure formation

Control of cell structure during pressure drop is essential for the investigation of cell formation mechanism. In this work, a one step batch foaming setup was totally redesigned to stabilize foam structure at initial stages of cell forming during and after depressurization as a novel idea. The saturation pressure, duration of pressure drop and foaming temperatures were 18.5 MPa, 100 ms and 70, 90, 110 °C, respectively. The shortest stabilized foaming time was 5 ms and the longest was 5000 ms. For comparison purposes non-stabilized samples were also produced. It was concluded that the effect of stabilization on foam morphology is dependent on the foaming temperature. Foam structure at foaming temperatures of 70°C did not change with change of foaming time significantly. Foam structure at foaming temperatures of 110°C for the shortest and the longest foaming times changed from 90 μm to 170 μm and 7E + 06 cell/cm³ to 8E + 06 cell/cm³.