Patent ID: 8366977

Claim:
A process for manufacturing a recycled polyamide yarn comprising a high content of polyamide waste and exhibiting good dyeability, comprising the steps of: (i) providing an industrial polyamide waste (IPW) having a concentration of amino-end groups (AEG) of from about 20 meq/kg to about 35 meq/kg; (ii) providing a virgin polyamide rich in amino end-groups (PRA), having a concentration of AEG of from about 75 meq/kg to about 95 meq/kg; (iii) mixing said IPW with said PRA in a gravimetric dosing system, wherein the concentration of amino end groups of said recycled polyamide yarn is assessed and the PRA/IPW ratio in step (iii) is adjusted in real-time; and (iv) melt-spinning the mixture; wherein said high content of polyamide waste comprises at least 80 wt % of said recycled polyamide yarn.