What is the Producton Process Flow of EPS Pre-expand machine
About EPS Pre-Expander：
A certain amount of foaming agent and water vapor are retained in the beads pre-expanded by EPS pre-expand machine. When they are discharged from the machine, they condense into liquid, and the liquid foaming agent dissolves into polystyrene, so that the pressure in the bubble is quickly reduced, and there is negative pressure (partial vacuum) in the bubble. The beads are very soft and easy to deform. Therefore, during air supply, try not to make the wind pressure too large, the inner wall of the air duct should be as smooth as possible, and the bending radius should be as large as possible (reduce collision resistance). The pipeline should be a good conductor of electricity. The whole line must be grounded to avoid electrostatic ignition, and the transmission speed should not exceed 8m / s to avoid bead damage.
The beads just out of the EPS pre-expand machine are wet. After being discharged from the EPS pre-expand machine, they absorb air and suddenly encounter cold, resulting in the condensation of foaming agent in the honeycomb cell and the formation of negative pressure in the cell. Therefore, the beads must be placed for a period of time after EPS pre-expand machine. On the one hand, they must be dried, and on the other hand, they must penetrate into the air to eliminate the negative pressure, so as to balance the internal pressure and external pressure in the cell, In order to avoid the collapse of the bubble hole and make the beads elastic.
The process of drying, cooling and stable cell pressure of EPS beads just out of EPS pre-expand machine is called ripening. Ripening can improve the further expansion, fusibility between beads and elasticity of beads in the molding process, which is conducive to improving the quality of EPS products.
About great shape molding machine manufacturer:
China Longwell is a professional EPS Machinery Supplier and polystyrene machine manufacturer, We offer kinds of EPS machines, EPS molds, 3D panel machines, sandwich panel machines, assistant facilities and all kinds of EPS machine spare parts.
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