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3. Production of extruded expanded polystyrene (EPS-E or XPS)
The most common extrusion process for EPS-E is known as direct gazing or physical expansion. It produces sheets from 20 to 200 mm thick, and foils from 0.5 mm thick. Sheet density is very low (≈ 0.07 kg/m 3 ). Figure 18 shows a schematic diagram of the extruder.
Crystal polystyrene granules are melted under pressure in an extruder, then nucleating agent(s) and liquid or gaseous blowing agent(s) are mixed with the molten polymer. The mixture is kept under pressure and pushed through the die. As it exits the die, the expanding agent creates expanding cells. The resulting expanded plate or sheet is then cooled....
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Production of extruded expanded polystyrene (EPS-E or XPS)
Properties of expanded polystyrene
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Syndicat National des Plastiques Alvéolaires – SNPA [email protected]http://www.snpa.fr
...Economic data
The global EPS market totalled 3.75 million tonnes in 2004, of which 46% was used in packaging.
The breakdown of the insulation and packaging markets varies from one continent to another. These are entirely representative of building traditions (whether or not to insulate) and the importance of industries using EPS packaging. In Japan, for example, a leader in the electronics sector and the world's...
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