Method for production of expanded polystyrene panels

Abstract From the Canadian patent

Method for production of expanded po1ystyrene panels", A process for manufacturing expanded polystyrene panels includes the following stages:, a) Preparation of pre-expanded panels of polystyrene by extrusion and simultaneous injection if propellent agent into an extruder fitted with an extrusion die of suitable type and in particular fitted with means allowing for good mixing of the molten polymer with the propellent agent and means allowing for uniform cooling to the best value if the temperature of the expandable plastic mass before exit from the die. b) Conditioning of said panels at room temperature or at whatever temperature higher than room temperature, provided it is such to prevent …