Assembly for producing a plastic melt for porous films in the form of membrane films having the following features: - having a planetary roller extruder for producing a free-flowing plastic melt from thermoplastics; - the planetary roller extruder has a filling opening and an output side for outputting the plastic melt; further specified by the following features: - a melt pump is provided; - the output side of the planetary roller extruder is connected to a downstream input side of the melt pump for onward transportation of the plastic melt; - the connection is designed: a) as a pressure channel; or b) as a pressure conduit that is shielded in relation to the surrounding atmosphere; - the planetary roller extruder and the melt pump are designed and/or can be driven such that the plastic melt is applied or can be transferred to the melt pump under pressure on the input side; - the pressure under which the plastic melt is applied or can be transferred to the input side of the melt pump is greater than 4 bar, 5 bar, 6 bar, 7 bar, 8 bar, 9 bar, 10 bar, 11 bar, 13 bar, 15 bar, 17 bar or greater than 19 bar; - to increase the pressure under which the plastic melt is applied or can be transferred to the input side of the melt pump, the melt pump is designed to reduce its pump rotational speed, so that the plastic melt builds up from the input side of the melt pump in the direction of the output side of the planetary roller extruder, this build-up working against the continuous material flow of the further plastic melt so that it causes an increase in pressure; the assembly is characterised in that - a region beginning from the filling opening of the planetary roller extruder is free from air openings up to the input side of the melt pump so that air dragged into the plastic melt is pushed out of said plastic melt when the pressure of the plastic melt builds up, and is pushed in the direction of the filling opening and only then degassed from the planetary roller extruder. - having a planetary roller extruder for producing a free-flowing plastic melt from thermoplastics; - the planetary roller extruder has a filling opening and an output side for outputting the plastic melt; - a melt pump is provided; - the output side of the planetary roller extruder is connected to a downstream input side of the melt pump for onward transportation of the plastic melt; - the connection is designed: a) as a pressure channel; or b) as a pressure conduit that is shielded in relation to the surrounding atmosphere; a) as a pressure channel; or b) as a pressure conduit - the planetary roller extruder and the melt pump are designed and/or can be driven such that the plastic melt is applied or can be transferred to the melt pump under pressure on the input side; - the pressure under which the plastic melt is applied or can be transferred to the input side of the melt pump is greater than 4 bar, 5 bar, 6 bar, 7 bar, 8 bar, 9 bar, 10 bar, 11 bar, 13 bar, 15 bar, 17 bar or greater than 19 bar; - to increase the pressure under which the plastic melt is applied or can be transferred to the input side of the melt pump, the melt pump is designed to reduce its pump rotational speed, so that the plastic melt builds up from the input side of the melt pump in the direction of the output side of the planetary roller extruder, this build-up working against the continuous material flow of the further plastic melt so that it causes an increase in pressure; the assembly is characterised in that - a region beginning from the filling opening of the planetary roller extruder is free from air openings up to the input side of the melt pump so that air dragged into the plastic melt is pushed out of said plastic melt when the pressure of the plastic melt builds up, and is pushed in the direction of the filling opening and only then degassed from the planetary roller extruder.