The production process of second-hand foam equipment is amazing

The production process of the second-hand foam equipment is amazing. The pre-expanded beads of the second-hand foam equipment retain a certain amount of foaming agent and water vapor. When they are out of the machine, they will condense into a liquid, and the liquid foaming agent will dissolve into the polystyrene. In this way, the pressure in the bubble is quickly reduced, negative pressure (partial vacuum) appears in the bubble, and the beads are very soft and easily deformed. Therefore, when air is sent, try not to make the wind pressure too large, the inner wall of the air pipe should be as smooth as possible, and the bending radius should be as large as possible (to reduce collision resistance). The pipeline should be a good conductor of electricity, and the entire line must be grounded to avoid static electricity. For ignition, the transmission speed should not exceed 8m/s to avoid damage to the beads. A certain amount of foaming agent and water vapor are retained in the pre-expanded beads of the second-hand foam equipment. When they are discharged from the machine, they will condense into a liquid, and the liquid foaming agent will be dissolved into the polystyrene, which will quickly reduce the pressure in the bubbles. , There is negative pressure (partial vacuum) in the bubble, and the beads are very soft and easily deformed. Therefore, when air is sent, try not to make the wind pressure too large, the inner wall of the air pipe should be as smooth as possible, and the bending radius should be as large as possible (to reduce collision resistance). The pipeline should be a good conductor of electricity, and the entire line must be grounded to avoid static electricity. For ignition, the transmission speed should not exceed 8m/s to avoid damage to the beads. The beads of the second-hand foam equipment are wet. After being released from the pre-expander, they absorb air and suddenly encounter cold, which causes the foaming agent in the honeycomb cells to condense and form a negative pressure in the cells, so the beads are pre-expanded. After that, it must be placed for a period of time, on the one hand to dry it, on the other hand to infiltrate the air to eliminate the negative pressure, so as to balance the internal pressure and external pressure in the cells, so as to prevent the cells from collapsing and make the beads elastic. In the curing process of second-hand foam equipment, the beads are cooled by air, and the foaming agent and water vapor in the pores of the cells are condensed into liquid, so that negative pressure is formed in the cells. At this time, the air penetrates into the cell through the cell membrane to balance the pressure in the cell with the external pressure, which will make the pre-expanded beads elastic.