Use of waste carpet as filler
View Patent ↗By utilizing specially processed waste carpeting as a filler in the production of carpet backcoating, roofing materials, or other similar products, the amount of waste carpeting that is landfilled or otherwise disposed of is significantly reduced as is the need for mining the mineral fillers. Waste carpeting (post-consumer and/or waste from new carpet manufacture) containing calcium carbonate and a thermoplastic resin is collected and size-reduced to a size corresponding to the size of calcium carbonate typically used as a filler. The size-reduced waste carpeting is added as filler to at least one other material, such as polymers in standard latex, EVA, or PVC carpet backcoatings, to provide a composite used in the manufacture of a useful product (like carpet backcoating), and then the composite material is used to make the useful product (such as carpet backcoating, which is used as a primary or secondary backcoating in the manufacture of new carpeting). The waste carpeting may provide between 0–100% of the filler of carpet backcoating, with any remainder made up by conventional fillers, such as calcium carbonate.
1. A method of using waste products separated from recycled carpeting comprising:
(a) collecting waste calcium carbonate and thermoplastic materials;
(b) reducing the waste calcium carbonate and the thermoplastic materials to a predetermined size in a range of 50–100 to 95–325, wherein the first number represents the percentage of the first material which will pass through a mesh screen having a mesh size corresponding to the second number;
(c) adding the reduced size material of step (b) to a second material to provide a composite material useful in the manufacture of the new carpet; and
(d) making the new carpet containing the composite material;
wherein step (c) is practiced to produce an aqueous-based carpet backcoating and step (d) includes making new carpeting with the aqueous-based carpet backcoating.
2. A method according to claim 1 wherein the aqueous-based backcoating comprises a vinyl acetate emulsion.
3. A method according to claim 1 wherein the aqueous-based backcoating comprises an acrylic emulsion.
4. A method according to claim 1 wherein the aqueous-based backcoating comprises a polyurethane emulsion.
5. A method of using waste products separated from recycled waste carpeting comprising:
(a) collecting waste carpeting containing calcium carbonate and thermoplastic materials;
(b) collecting waste calcium carbonate and the thermoplastic materials and reducing them to a predetermined size in a
range of 50–100 to 95–325, wherein the first number represents the percentage of the first material which will pass through a mesh screen having a mesh size corresponding to the second number;
(c) adding the reduced size material of step (b) to a second material to provide a composite material useful in the manufacture of the new carpet; and
(d) making the new carpet containing the composite material;
wherein step (c) is practiced to produce an aqueous-based carpet backcoating containing about 5–20% water, 20–60% backcoating and a second filler present in an amount of up to 70% calcium carbonate, wherein the second filler comprises a predetermined percentage of the composite material, and step (d) includes making a new carpet containing the composite material.
6. A method according to claim 5 wherein the aqueous-based backcoating comprises a vinyl acetate emulsion.
7. A method according to claim 5 wherein the aqueous-based backcoating comprises an acrylic emulsion.
8. A method according to claim 5 wherein the aqueous-based backcoating comprises a polyurethane emulsion.