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EPS Beads Making Machine Factory
EPS auto batch pre-expander machine
EPS polystyrene foam beeds machine
China EPS Pre Expander Machine Manufacturers
Auto Batch EPS Pre Expander Machine For EPS Foam Beads Making
EPS Batch Pre-Expander With Fluidized Bed Dryer
Automatic expandable polystyrene pre-expander machine
EPS Continuous Pre-expander Machine Factory
EPS Continuous Pre-expander with First and Second Expansion
EPS polystyrene foam beeds machine
EPS continuous pre-expander machine
EPS pre-expander with second expansion
EPS Pre-expander Machine Production Process
After the EPS Pre-expander Machine, the beads retain a certain amount of foaming agent and water vapor. When they are discharged from the machine, they condense into a liquid, and the liquid foaming agent is dissolved in the polystyrene, making the pressure in the bubbles very high Decrease quickly, 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 Pre-Expander EPS Foaming Machine inner wall of the duct 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.
When Pre-Expander EPS Foaming Machine sparking, the transmission speed should not exceed 8m/s to avoid damage to the beads. The beads of the EPS Pre-expander machine are all moist. After being discharged from the EPS Pre-expander machine, 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. The pellets must be placed for a period of time after pre-expansion. On the one hand, they are dried, and on the other hand, they are allowed to infiltrate air to eliminate negative pressure, so that the internal pressure and external pressure in the cells can be balanced, so as to prevent the cells from collapsing and make the beads elastic.
The process of drying, cooling, and stabilizing the cell pressure of the Pre-Expander EPS Foaming Machine that are just out of the EPS Pre-expander machine for a certain period of time is called maturation. Maturation improves the further expansion of the pre-expanded beads during the molding process, the sintering between beads and the elasticity of the beads, which is beneficial to improve the quality of EPS products.
During the curing process, 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.
The maturation can be divided into two methods: natural maturation and pressure maturation. Under cool, dry, and ventilated conditions, allowing natural aeration is called natural maturation. Adding gas (air, nitrogen) to the pre-expanded beads after natural maturation in a sealed container to make them have a certain pressure and inflate it, which is called pressurized maturation.
EPS Pre-expander machine supplier
WANLONG MACHINERY is a leading China EPS Pre Expander Machine Factory that focuses on EPS Pre-expander machine. Innovation is the driving force for us to establish competitive advantage, and is the key to our leading position in the fierce international market competition.