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1, The principle of (expandable polystyrene)
What is EPS?
EPS is Expandable polystyrene
EPS is manufactured from sytrene monomer, derivative of ethylene and benzene by using a polymerization process.
EPS is light weight cellular s material consisting of small spherical shaped particle containing about 98% air.
This micro cellular closed cell construction provides EPS with excellent insulating and shock absorbing characteristics.
Where it is used …..?
EPS is widely used in mainly everyday situations, where its light weight. Strengh, thermal insulation and shock absorption and very low vater absorption, dimensionally stable, durability, inert, organic material, does not deteriorate with age those characteristics provide economic high performance products.
The almost exclusive use of EPS as the insulation material for cool stores, freezers and the most demanding of all insulation in the building.( Roof, Wall and Floor insulation).
EPS will last the life of most buildings in which it is used.
Safety
EPS is environment friendly, containing on CFCs or HCFCs, it is inert and safe for building products where if fire resistance is requird or desirable, EPS can be supplied containing a flame retardant which is normally used to prevents ignition of the EPS if exposed to a flame.
（ This flame retardant product will be supplied depend on customer request）
EPS is resistant to almost all aqueous media including dilute acids and alkalis, methanol. Ethanol and silicone oils.
It has limited resistance to paraffin oils, diesel fuel and vaseline.
2, The complete EPS process
There are 5 manufacturing stages:
1) Pre-expansion:
Polystyrene granules are expanded by free exposure to steam to form larger beads, each consisting of a series of non-interconnecting cells.
2) Conditioning:
After expansion, the beads still contain small quantities of both condensed steam and pentane gas. As they cool in the silos, air gradually diffuses into the pores, replacing, in part, the other components.
3) Moulding:
The beads are moulded to form boards, blocks or customised products. The mould serves to shape and retain the pre-foam, and steam is again used to promote expansion. During moulding, the steam causes fusion of each bead to its nei***ours, thus forming a homogeneous product.
4) Shaping:
Following a short cooling period, the moulded block is removed from the machine, and after further conditioning, may be cut or shaped as required using hot wire elements or other appropriate techniques.
5) Post-production processing:
The finished products which have a huge a application in package and construction,such as vegetable and fish box,electronic parts package,wall and roof insulation,concrete foam,house decoration and so on.