Patent ID: 9290622
Filing Date: 2016-03-22
CPC Classification: B29B,B29C,B29K,C08G

Claim Text:
1. A method of polymerizing lactams in molds for the continuous manufacture of serial parts in corresponding molds, said manufactured parts having a variable size, geometry or composition, the method comprising: (a) continuously feeding into a mixing head a lactam, a catalyst and an initiator; wherein the lactam is at a first predetermined temperature between 70-160° C., the catalyst is at a second predetermined temperature between 20-50° C., and the initiator is at a third predetermined temperature between 20-50° C., wherein the lactam, the catalyst, and the initiator are each independently fed into the mixing head from respective independent reservoirs through respective inlets comprising valves, wherein the lactam, the catalyst and the initiator are each circulated in independent circuits at said respective first, second and third predetermined temperatures; (b) continuously mixing in the mixing head the lactam, the catalyst and the initiator, to obtain a reactive mixture; (c) continuously feeding the reactive mixture obtained in step (b) through a nozzle into a mold, wherein a volume of a casting into said mold is determined by adjusting the opening of the valves of the inlets for a time corresponding to a total volume of a polymerization mixture coming out through said nozzle, said volume of reactive mixture corresponding to a part to be manufactured, said adjustment of the opening of the valves being controlled by an automatic and programmable timer, thus allowing the automatic manufacture of serial parts having a variable size, geometry or composition; (d) allowing the reactive mixture to polymerize in the mold to obtain a molded product; and, (e) demolding the molded product.