Device for polymerizing lactams in molds

A device for polymerizing lactams in molds, comprising:

• a reservoir for storing lactam, wherein said reservoir is kept at a temperature which varies in the range of 135-150° C. for melting the lactam and keeping it in melted state;
• lactam feeding means comprising dosing pipes for feeding the lactam from the reservoir,
• first dosing means for feeding an initiator;
• second dosing means for feeding an activator;
• a mixing head configured to receive the lactam, the initiator and the activator from respectively said lactam feeding means, said first dosing means and said second dosing means, the mixing head 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 without mixing each other until the output of the mixing head is reached;
• and
• a mixing pipe located at the output of said mixing head and configured to put the lactam, initiator and activator in contact for the first time, in such a way that they are mixed up;
• wherein said initiator and activator are liquid, and the cited reservoir and lactam feeding means are located within a heater configured to maintain the temperature of the lactam at a substantially constant value until it reaches the mixing head, wherein the lactam feeding means further comprises a pump configured to pump the lactam from the reservoir and to dose it towards the mixing head, the pump being located within the heater,
• the device further comprising an engine for controlling the dosing of the pump, the engine being outside said heater and joined to the pump by means of a shaft passing through a wall of said heater.