Importance

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Abstract

A method for cooling a foamed ribbon-shaped extrudate strand (3) is performed in a plant which comprises an extruder (8), a die (1), a vacuum cooling device (2) and a cooling drum. A polymer melt containing a blowing agent is produced in the extruder (8). The extrudate containing the blowing agent is guided to the die (1), whereby the die has an opening (7), through which a ribbon-shaped extrudate strand (3) is produced which foams in or after the die (1) to a foamed ribbon-shaped extrudate strand (13). The ribbon-shaped plastic foamed or foamable extrudate strand (13) is cooled first by a static vacuum cooling device (2, 25, 26), so as to obtain a precooled foamed ribbon-shaped extrudate strand (23) and the precooled foamed ribbon-shaped extrudate strand (23) is guided over a cooling drum (40, 41, 42). The precooled foamed ribbon-shaped extrudate strand (23) is in contact with the cooling drum over a wrap angle of at least 20°, such that the precooled foamed ribbon-shaped extrudate strand (23) is cooled.

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First Claim