A method of producing polyamides with a spray nozzle arrangement for colliding spray jets, comprising the following steps of: a) providing a first fluid spray composition and a second fluid spray composition with the proviso that - the first and/or second fluid spray composition comprises one or more components capable of polyamide formation which are selected from: lactams, aminocarboxylic acids, aminocarboxamides, aminocarbonitriles, diamines, dicarboxylic acids, dicarboxylic acid/diamine salts, dinitriles and mixtures thereof, - in the event of an activated anionic lactam polymerization only one of the two fluid spray compositions comprises at least one activator and only the other comprises at least one catalyst, b) spraying either of the two fluid spray compositions through the first or second spray nozzle (D1, D2) to obtain a first spray jet (S1, S2) and spraying the other fluid spray compositions through the other spray nozzle (D1, D2) to obtain a second spray jet (S1, S2), c) colliding the first spray jet with the second spray jet whereby the two fluid spray compositions combine to form a mixture which is capable of polyamide formation and which reacts to form a polyamide and a collision spray fan which is vertically aligned in the gravitational field forms between the spray nozzle arrangement, d) discharging the polyamide obtained in step c), e) optionally postpurifying the polyamide discharged in step d), f) optionally drying the polyamide discharged in step d) and/or postpurified in step e); wherein the spray nozzle arrangement comprises at least a first spray nozzle forming a first spray jet with a first spray jet cross-sectional area and a first spray jet longitudinal extent axis, wherein the first spray jet longitudinal extent axis is aligned in a gravitational field in a first vertical plane, and a second spray nozzle forming a second spray jet with a second spray jet cross-sectional area and a second spray jet longitudinal extent axis, wherein the second spray jet longitudinal extent axis is aligned in a gravitational field in a second vertical plane, wherein the first spray nozzle and the second spray nozzle have a spray direction facing the gravitational field and are arranged relative to each other such that the resultant spray jets (S1, S2) collide in a collision region in the spray direction facing the gravitational field, wherein the angle (α) between the first spray jet longitudinal extent axis and the second spray jet longitudinal extent axis is in the range from 5° to 170°, and the first spray nozzle and the second spray nozzle are arranged such that the first spray jet cross-sectional area of the first spray jet combines with the second spray jet cross-sectional area of the second spray jet to form an intersection set on collision, and wherein the first and/or second spray nozzle has a nozzle channel diameter in a range of 25 to 500 μm, and the first and/or second spray jet cross-sectional area (Q1, Q2) is in a range of 490 to 197 000 μm 2. a) providing a first fluid spray composition and a second fluid spray composition with the proviso that - the first and/or second fluid spray composition comprises one or more components capable of polyamide formation which are selected from: lactams, aminocarboxylic acids, aminocarboxamides, aminocarbonitriles, diamines, dicarboxylic acids, dicarboxylic acid/diamine salts, dinitriles and mixtures thereof, - in the event of an activated anionic lactam polymerization only one of the two fluid spray compositions comprises at least one activator and only the other comprises at least one catalyst, - the first and/or second fluid spray composition comprises one or more components capable of polyamide formation which are selected from: lactams, aminocarboxylic acids, aminocarboxamides, aminocarbonitriles, diamines, dicarboxylic acids, dicarboxylic acid/diamine salts, dinitriles and mixtures thereof, - in the event of an activated anionic lactam polymerization only one of the two fluid spray compositions comprises at least one activator and only the other comprises at least one catalyst, b) spraying either of the two fluid spray compositions through the first or second spray nozzle (D1, D2) to obtain a first spray jet (S1, S2) and spraying the other fluid spray compositions through the other spray nozzle (D1, D2) to obtain a second spray jet (S1, S2), c) colliding the first spray jet with the second spray jet whereby the two fluid spray compositions combine to form a mixture which is capable of polyamide formation and which reacts to form a polyamide and a collision spray fan which is vertically aligned in the gravitational field forms between the spray nozzle arrangement, d) discharging the polyamide obtained in step c), e) optionally postpurifying the polyamide discharged in step d), f) optionally drying the polyamide discharged in step d) and/or postpurified in step e);