Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Reexamination Certificate
2003-03-03
2004-11-09
Lechert, Jr., Sephen J. (Department: 1732)
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
C156S198000, C156S332000, C156S393000
Reexamination Certificate
active
06814826
ABSTRACT:
BACKGROUND OF THE INVENTION
In the conventional manufacture of floor coverings, e.g., carpeting and carpet tiles, hereafter sometimes collectively called carpeting, tufted pile yarns or like facings are held in place by a primary backing, and typically a secondary backing, as well as possibly other layers. At least some of the carpet backings (particularly latex, EVA, PVC, or other polymer-based backings) use filler as an important component thereof. The standard filler that is used is a mineral filler, typically calcium carbonate, alone, or in combination with some other common metal salts.
During the carpet manufacturing process there is waste carpeting produced, which is typically landfilled or burned. When new carpets are installed in place of old carpeting, the used, waste, carpeting (which is post-consumer waste at that point) is ripped up and also typically landfilled or burned. The calcium carbonate, or like mineral fillers, that are used in carpet backings are mined, and therefore have associated therewith the conventional problems associated with the mining of materials.
BRIEF DESCRIPTION OF THE INVENTION
According to the present invention methods of recycling waste carpeting and producing carpeting utilizing recycled materials, are provided which substantially eliminate or significantly reduce the problems discussed above. According to the present invention instead of using calcium carbonate, which is mined, as the filler for a carpet backing, recycled waste carpet (from new carpet production and/or from post-consumer waste) is used as the filler material in a hot melt application process in which the molten material including these waste products are applied to the carpet backing to deliver the desired physical properties such as strength and dimensional stability. This substantially eliminates, or at least significantly reduces, the amount of landfilling or other waste disposal that is necessary for waste carpeting while enabling the manufacture of fresh floor coverings using the waste materials.
The invention is also applicable to the production of other materials containing fillers, including various extruded thermoplastic and thermoset materials that typically use calcium carbonate filler, including, but not limited to, roofing materials, road paving materials, awnings, and tarps.
In a preferred embodiment according to the present invention, there is provided a method of manufacturing floor coverings using waste carpeting as at least part of backing material for the covering, comprising substantially sequentially the steps of (a) collecting waste carpeting, (b) effecting size reduction of the waste carpeting, (c) adding the size-reduced waste carpeting as a filler to at least one other material to form a molten mixture for backcoating a primary backing of the floor covering, (d) applying the molten mixture and a fabric material to a primary backing to form a laminate on the floor side of the primary backing and (e) cooling the laminate on the primary backing to form a floor covering having the backcoating containing the waste carpeting on a floor side of the primary backing.
In the method step a) may be practiced, to collect substantially only post-consumer waste carpeting, substantially only waste carpeting from new carpeting manufacture, or a blend of both. Post-consumer waste carpeting can be cleaned by any conventional cleaning technique before use, if desired or necessary. While the method is typically practiced utilizing all of the face yarn and primary backing, and backcoatings, under some circumstances the method may further comprise, between a) and b), separating the face yarn and primary backing from waste carpeting backcoating to produce a substantially face yarn and primary backing-free waste carpeting backcoating, and using substantially only the waste carpeting backcoating in step b). Also, various carpet backcoatings may be separated from each other so as to use only one particular carpet backcoating, such as the primary or secondary backcoating.
The invention may also further comprise, between steps b) and c), step f) densifying the size reduced carpeting, and effecting a further size-reducing thereof. Also step c) may be practiced so as to provide between approximately 40-100% of the filler of the carpet backcoating as size-reduced waste carpeting. For example in one embodiment of the invention, steps c) and d) are practiced to produce a carpet backcoating with about 5-18% EVA copolymer, about 32-45% resin, about 20-50% size-reduced waste carpeting filler, and about 0-30% calcium carbonate filler. Also in the practice of the method, steps b) and f) may be practiced to produce waste carpet coating have a particle size and range substantially the same as calcium carbonate filler.
The method includes latex carpet backcoatings and is not restricted to thermoplastic resin such as PVC carpet backcoatings, EVA, or other polymer-based backcoatings.
The invention also further typically comprises making new carpeting with the carpet backcoating.
Alternatively according to the present invention, steps c) and d) may be practiced to produce extruded thermoplastic or thermoset products and/or to produce awnings, roofing materials, road paving materials, or tarps, with a particle size of the waste carpeting filling between about 20-100 mesh.
According to another aspect of the present invention there is provided carpeting having a face and primary backing, primary backcoating, and at least one secondary backcoating; and at least one of the primary and secondary backcoatings comprising a polymer and filler, and wherein at least about 40% of the filler is size-reduced waste carpeting, at least one of the primary backcoating or secondary backcoating including a hot melt compound applied as a molten mixture of polymers and fillers. At least one of the backcoatings may comprise about 5-18% EVA copolymer, about 32-45% resin, about 20-50% size-reduced waste carpeting filler, and about 0-30% calcium carbonate filler. The size-reduced waste carpeting may comprise size-reduced post consumer waste carpeting, and the filler may have a particle size and range substantially the same as calcium carbonate filler.
It is the primary object of the present invention to produce new materials including floor coverings utilizing recycle waste carpeting to eliminate disposal problems, while at the same time reducing the mining or other production of filler materials typically used in carpet backing, or other products. These and other objects of the invention will become clear from an inspection of the detailed description of the invention and from the appended claims.
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Lechert, Jr. Sephen J.
Mohawk Brands Inc.
Nixon & Vanderhye
LandOfFree
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