Microcellular plastics refer to foams with a cell diameter of 0.1~10 pum and a cell density of 109~1012pieces/cm3, which have excellent comprehensive properties. The foaming process of microcellular plastics generally goes through three stages, namely the nucleation of bubbles, the growth of bubbles, and the solidification and shaping of the foam body. Among them, a large pressure and pressure drop rate are required during the nucleation process of bubbles, so a melt gear pump can be used as the nucleation device.
The melt pump is used as a nucleation device, mainly to increase the pressure of the melt by utilizing the boosting effect of the melt pump for plastic extrusion. In this type of microcellular plastic extrusion equipment, a hot melt pump is installed at the rear end of the barrel, and then the extrusion foam machine head is connected. After the gas/polymer system enters the inlet of the melt pump, a closed space is formed between the gear and the inner wall of the pump body. As the gear rotates, the closed space becomes smaller and smaller, causing an increase in the pressure of the polymer melt, thereby increasing the pressure of the melt. After the system flows out of the melt pump, it quickly releases pressure, forming a large number of bubble nuclei, which are then solidified and shaped to obtain microporous plastics.
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