Device for polymerizing lactams in molds

A device (10) for polymerizing lactams in molds, comprising: a reservoir (20) for storing lactam, wherein said reservoir (20) is kept at a temperature which varies in the range of 135-150ºC for melting the lactam and keeping it in melted state; lactam feeding means comprising dosing pipes for feeding the lactam from the reservoir (20), first dosing means (30) for feeding an initiator; second dosing means (40) for feeding an activator; a mixing head (50) configured to receive the lactam, the initiator and the activator from respectively said lactam feeding means, said first dosing means (30) and said second dosing means (40), the mixing head (50) having three independent inlets for independently receiving the lactam, the initiator and the activator, to allow said lactam, initiator and activator respectively flow within the mixing head (50) without mixing each other until the output of the mixing head (50) is reached; and a mixing pipe (51) located at the output of said mixing head (50) and configured to put the lactam, initiator and activator in contact for the first time, in such a way that they are mixed up.The initiator and activator are liquid, and the cited reservoir (20) and lactam feeding means are located within a heater (21) configured to maintain the temperature of the lactam at a substantially constant value until it reaches the mixing head (50).