Method for the Manufacture of Foams of Low Density

A method for manufacturing low density foams in which a polymeric material is melted in a first extruder (201) to a polymer melt, the polymer melt is fed to a second extruder (211) a blowing agent is added to the polymer melt, such that a melt containing the blowing agent is obtained, thereafter the melt containing the blowing agent is cooled in the second extruder (211), thereafter the melt is directed through a static mixer after leaving the second extruder (211), whereby the static mixer is disposed with a mixer insert (3), whereby the mixer insert (3) has insert elements, which engage with the melt, such that the temperature of the melt is homogenized over the entire cross-section of the mixer insert, whereby the static mixer can be cooled and/or heated to obtain a temperature stabilized cooled melt, whereby the temperature stabilized cooled melt is discharged subsequently through a die element (240, 250).