Hangzhou Epsole Machinery Co., Ltd. is one of the most reliable manufacturers and suppliers of eps(expandable polystyrene) in China. We warmly welcome you to buy high quality eps(expandable polystyrene) for sale here from our factory. Good service and reasonable price are available.
Expandable Polystyrene (EPS) is a rigid, closed cell, thermoplastic foam material produced from solid beads of polystyrene, which is polymerised from styrene monomer and contains an expansion gas (pentane) dissolved within the polystyrene bead.
THE MOULDING OF EPS
The production of products made from EPS(Expandable Polystyrene) is done so in 3 stages...
1. Pre-Expansion
- A measured quantity of expanded polystyrene beads are put into a profoamer
- Steam is circulated through these beads as well as a small amount (usually around 5% by weight) of petane which is a blowing agent. The beads are subsequently expanded by around 40 times.
- The expanded polystyrene beads are transferred into a storage hopper...
2. Maturing
- The material cools and the pentane liquifies which creates a partial vacuum inside the bead
- The expanded polystyrene beads are stored for between 12-24 hours to aid the maturing and to allow air to diffuse into the beads
3. Final Forming
- The beads are then reheated using steam and the mould is filled with a pre-measured amount of expanded beads
- Steam is introduced into the mould circulating round the polystyrene beads, expanding them further by 10%.
The steaming process stops and a vacuum is drawn to extract residual condensed water and heat. Additional water channels assist in cooling the mould
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