Process for dyeing poly (trimethylene terephthalate) carpet continuously

A process for continuously dyeing poly(trimethylene) terephthalate bulk continuous filament yarn carpet, said process comprising the steps of:

• a) heat-setting a poly(trimethylene) terephthalate bulk continuous filament yam carpet at 120° C. to 150° C.;
• b) moving a poly(trimethylene) terephthalate bulk continuous filament yarn carpet to provide a continuously moving carpet moving at a speed of from 5 to 10 m/mm;
• c) after said heat-setting, applying an aqueous dyeing solution having a viscosity of from 30 to 300 cps and a temperature of 45° C. to 100° C. to said continuously moving carpet, said aqueous dyeing solution not including an anti-frosting agent;
• d) after said applying of step c), steaming said poly(trimethylene) terephthalate bulk continuous filament yam carpet with saturated steam at 102° C. to 150° C. for 5 to 10 mm;
• and
• e) after said steaming, rinsing and then drying said poly(trimethylene) terephthalate bulk continuous filament yam carpet;
• whereby said poly(trimethylene) terephthalate bulk continuous filament yarn carpet is dyed to a uniform and fast color.