installation reaches a great constructive height because of these dimensions the installations becomes more expensive aside from the fact that the filaments f are also exposed to uncontrolled influences on the cooling path the use of water would certainly shorten the cooling path due to good heat transfer however great disadvantages occur because of the strong friction between water and filaments surprisingly it has now been shown that with foam a similarly strong cooling action can be reached as with water however the damaging friction between filament and foam does not occur as with water the cooling conditions for foam with different shares in volume of liquid are shown in curves b and c in fig3 from this it can be seen that for a foam with a liquid volume share of 5 the cooling path is shortened to approximately 1 1 to 1 2 meters under the same conditions as for curve a with a higher share in volume the cooling path is further shortened because heat transfer also increases considerably as a function of the volume share of liquid in the foam thus curve c for example shows the cooling course for a foam with approximately 10 of liquid volume share here the cooling path sk is shortened to the length of path sc which is less than 1 meter long in order to reach the.