Soft-substrate carpet made from recycled yarns and method for manufacturing same

A method for manufacturing a soft-substrate carpet made from recycled yarns, comprising:

• (1) tufting carpet fibers into a first non-woven scrim to form a carpet fiber layer;
• (2) uniformly mixing aqueous styrene butadiene rubber (SBR) latex, an anti-bacterial agent, calcium carbonate and a foaming agent according to a mass ratio of (62-100):(0-1):(0-35):(0-2) to form an SBR latex mixture, air foaming the SBR latex mixture with a foaming ratio of 1.2-10, uniformly coating the SBR latex mixture on a back surface of the carpet fiber layer with a dry coating weight of 50-800 g/m2, and drying the SBR latex coating to form a latex layer having a latex surface;
• (3) classifying recycled fibers, plying the recycled fibers into 850-4000 denier thick recycled fibers, and tufting the thick recycled fibers into a second non-woven scrim to form a recycled fiber layer having a tufted surface;
• (4) mixing polyolefin (PO) and calcium carbonate according to a mass ratio of (20-45):(55-80) to form a first PO mixture, heating and melting the first PO mixture, uniformly stirring, cooling and granulating the first PO mixture to form first PO-calcium carbonate bonding agent particles;
• feeding the first PO-calcium carbonate bonding agent particles into a carpet coater, heating and melting the first PO-calcium carbonate bonding agent particles at 130-220° C., flatly coating a resulting first PO-calcium carbonate bonding agent on the tufted surface of the recycled fiber layer using an extruder, scraping the applied first PO-calcium carbonate bonding agent to a height of 0.5-1.0 mm using a scraper with an applied amount of the first PO-calcium carbonate bonding agent being 150-2000 g/m2, bonding the tufted recycled fiber layer and a non-woven layer together with the applied first PO-calcium carbonate bonding agent to form a soft substrate laminate, compacting the soft substrate laminate with a roller, and cooling the soft substrate laminate to 5-30° C. to form a soft substrate layer having a back surface;
• and
• (5) mixing PO and calcium carbonate according to a mass ratio of (25-50):(50-75) to form a second PO mixture, heating and melting the second PO mixture, cooling and granulating the second PO mixture to form second PO-calcium carbonate bonding agent particles;
• feeding the second PO-calcium carbonate bonding agent particles into the carpet coater, heating and melting the second PO-calcium carbonate bonding agent particles at 130-220° C., flatly coating a resulting second PO-calcium carbonate bonding agent on the back surface of the soft substrate layer using the extruder, scraping the applied second PO-calcium carbonate bonding agent using the scraper, and bonding the back surface of the soft substrate layer to the latex surface of the carpet fiber layer to form a carpet laminate with an applied amount of the second PO-calcium carbonate bonding agent controlled at 500-2500 g/m2 and a thickness of 0.8-1.5 mm;
• compacting the carpet laminate with a roller to form the soft-substrate carpet, and putting the soft-substrate carpet into a cooling chamber at 5-30° C. to cool the soft-substrate carpet;
• wherein
• in step (2), the drying is performed at a drying temperature of 140-200° C., and for a drying time of 2-8 min.