ENGINEERED WATERPROOF PLASTIC COMPOSITE FLOORING AND WALL COVERING PLANKS

Abstract

Waterproof engineered floor and wall planks have a veneer layer bonded with a plastic composite core, and an underlayer, preferably an underlayer of cork.

Claims

1-20. (canceled)

21. An engineered waterproof plank comprising: an extruded waterproof core comprising a composite that includes cork and less than 10% of additives selected from the group consisting of anti-oxidation agents, stabilizers, colorants, anti-fungus agents, coupling agents, reinforcing agents, and lubricants; a wear layer adhered to a top surface of the waterproof core; a waterproof adhesive layer bonding the wear layer to the top surface of the waterproof core; and a first edge with a groove extending laterally into the waterproof core and a second opposite edge with a lateral protrusion from the waterproof core, wherein the groove and protrusion have profiles shaped to form a click-lock edge fastening system.

22. The plank of claim 21, wherein the waterproof core comprises a cork dust.

23. The plank of claim 21, further comprising an underlayer selected from the group consisting of cork, rubber, foam, and waterproof balance paper.

24. The plank of claim 21, further comprising a cover layer over the wear layer.

25. The plank of claim 24, wherein the cover layer is selected from the group consisting of melamine resin with aluminum oxide and polyurethane.

26. The plank of claim 21, wherein the waterproof core comprises: (a) at least 55% of cork dust or at least 55% dust comprising cork dust in combination with at least one of wood dust or bamboo dust; and (b) at least 20% of a plastic selected from the group consisting of high-density polyethylene and polyvinyl chloride.

27. The plank of claim 21, wherein the waterproof adhesive layer comprises a hot melt adhesive.

28. The plank of claim 23, further comprising a second waterproof adhesive layer bonding the underlayer to a bottom surface of the waterproof core.

29. The plank of claim 21, wherein the plank is rectangular and wherein the wear layer comprises decorative vinyl and is adhered to the top surface of the waterproof core by a hot melt adhesive, wherein the plank further comprises: (a) a cover layer over the wear layer, the cover layer selected from the group consisting of melamine resin with aluminum oxide and polyurethane; (b) an underlayer selected from the group consisting of cork, rubber, and foam, adhered to a bottom surface of the waterproof core by a hot melt adhesive, and wherein the waterproof core has substantially planar top and bottom surfaces separated by a thickness defining the first edge along a first side and the second edge along an opposite second side, and third and fourth edges along opposite third and fourth sides.

30. The plank of claim 29, wherein the static coefficient of friction of the plank is at least 0.60 as measured according to ASTM C 1029-96.

31. The plank according to claim 21, wherein the plank is rectangular and wherein the wear layer is selected from the group consisting of cork, bamboo, and wood veneer, the wear layer is encapsulated in resin, and the wear layer is adhered to the top surface of the waterproof core by a hot melt adhesive; wherein the plank further comprises an underlayer selected from the group consisting of cork, rubber, and foam, the underlayer adhered to a bottom surface of the waterproof core by a hot melt adhesive, wherein the waterproof core comprises: (a) at least 55% of cork dust or at least 55% dust comprising cork dust in combination with at least one of wood dust or bamboo dust; (b) at least 20% of high-density polyethylene; and (c) calcium carbonate filler, and wherein the waterproof core has substantially planar top and bottom surfaces separated by a thickness defining the first and second edges along respectively opposite first and second sides, and third and fourth edges along respectively opposite third and fourth sides.

32. The plank of claim 31, further comprising a cover layer over the wear layer, wherein the cover layer is selected from the group consisting of melamine resin with aluminum oxide and polyurethane.

33. An engineered waterproof plank comprising: (a) a veneer layer comprising one or more of cork, bamboo, or wood, said veneer layer encapsulated in resin, and said veneer layer adhered to a top surface of a waterproof core; (b) an underlayer comprising one or more of cork, rubber, foam, or paper, said underlayer adhered to a bottom surface of the waterproof core; (c) the waterproof core comprising: (i) at least about 55% of dust selected from the group consisting of wood, bamboo and cork; (ii) at least about 20% of plastic selected from the group consisting of high-density polyethylene and polyvinyl chloride; and (iii) about 10% or less of additives selected from the group consisting of anti-UV agents, anti-oxidation agents, stabilizers, colorants, anti-fungal agents, coupling agents, reinforcing agents, and lubricants; (d) wherein a groove extends laterally along a first edge of the waterproof core and a lateral protrusion extends from an opposite second edge of the waterproof core, the groove and protrusion comprising a click-lock edge fastening system.

34. The plank of claim 33, wherein the waterproof core further comprises a filler.

35. The plank of claim 34, wherein the filler is calcium carbonate.

36. The plank of claim 33, wherein the veneer layer is adhered to the top surface of the waterproof core by a hot melt adhesive.

37. The plank of claim 36, wherein the hot melt adhesive has an application temperature over 200 degrees fahrenheit.

38. The plank of claim 33, wherein the underlayer is adhered to the bottom surface of the waterproof core by a hot melt adhesive.

39. An engineered waterproof plank comprising: (a) a waterproof plastic composite core having a top surface and a bottom surface; (b) a first waterproof bonding layer joining a veneer layer to the top surface of the waterproof core; and (c) a second waterproof bonding layer joining an underlayer to the bottom surface of the waterproof core, (d) wherein a bottom surface of the underlayer is attached to at least one of a subfloor or a wall by an adhesive.

40. The plank of claim 39, wherein the waterproof core comprises a groove extended laterally along a first edge and a lateral protrusion that extends from an opposite second edge of the waterproof core, the groove and protrusion comprising a click-lock edge fastening system.

41. An engineered plank comprising: a rigid inert core that is at least one of waterproof or water-resistant, wherein said rigid inert core comprises a thermoplastic polymer and a filler, and wherein said filler comprises calcium carbonate; a veneer layer disposed on a top surface of the rigid inert core, wherein the veneer layer is selected from a group consisting of wood, cork, bamboo, tile, stone, rubber, decorative plastic, linoleum and decorative vinyl, and wherein the veneer layer is bonded to the top surface of the rigid inert core via a waterproof bonding; a protective cover layer disposed above the veneer layer, wherein the protective cover layer comprises one of a melamine based layer, an aluminum oxide based layer, or a polyurethane based layer; and wherein the engineered plank further comprises a locking mechanism to interlock one engineered plank to another engineered plank.

42. The plank of claim 41, wherein the thermoplastic polymer comprises a high-density polyethylene or a polyvinylchloride.

43. The plank of claim 41, wherein the engineered plank comprises a floor plank or a wall plank.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The particular features and advantages of the invention as well as other objects will become apparent from the following description taken in connection with the accompanying drawings in which:

[0012] FIG. 1 is a perspective view of an exemplary engineered waterproof flooring plank according to the invention.

[0013] FIG. 2 is an exploded sectional view of an exemplary flooring plank according to the invention.

[0014] FIGS. 3a-d depict exemplary prior art click-lock edge configurations that may be advantageously used with various planks made according to the invention.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

[0015] In general, the present invention relates to a waterproof engineered flooring plank or wall panel. The end view of the exemplary flooring plank 10 shown in FIG. 1 shows the three principal structural components of the plank. Specifically, the top surface is a veneer layer, such as wear layer 20, that is waterproof and is selected from a number of possible materials including: tile or stone veneers; rubber; decorative plastic; decorative vinyl; linoleum; and any material (such as cork, bamboo or wood veneer) encapsulated in vinyl or resin to render the layer waterproof and wear resistant. A decorative vinyl wear layer is particularly cost and performance effective. This surface is not only resistant to moisture, but can also be provided with a static coefficient of friction (CoF) of about 0.68 according to ASTM C 1028-96, and a CoF of at least about 0.60 is desirable for most applications.

[0016] The middle section or core 30 of the engineered plank 10 is a composite material formed from raw or unprocessed bamboo dust, wood dust, cork dust or a mixture thereof and high density polyethylene (HDPE) or alternatively, virgin or recycled PVC or a combination of such PVCs, and up to about 10% chemical additives such as anti-UV agents, anti-oxidation agents, stabilizers, colorants, anti-fungus agents, coupling agents, reinforcing agents, and lubricants. Calcium carbonate may also be added as a filler. After blending and melting the dust and HDPE or PVC, and additives and filler, the composite material is extruded to desired dimension. This type of HDPE and dust composite has previously been manufactured primarily for use as outdoor decks, railings and fences, but heretofore has not been used in a fashion that was sufficiently visually appealing or commercially viable for residential or commercial flooring. Instead, these wood-plastic or bamboo-plastic composites have been impregnated with colors according to a limited color pallet suitable and only promoted for exterior use. When used in the present invention, some additives, such as anti-UV agents, anti-fungals, and insecticides, are not needed. Also, heretofore, cork dust has not been a principal ingredient of the plastic composites. Whereas generally the addition of greater amounts of wood or bamboo dust provided greater rigidity to the resulting planks, cork dust retains some resilience even in the plastic mixture. The core 30 can be solid, or can be provided with channels or cavaties if desired, particularly in relatively thick embodiments.

[0017] The underlayment layer 40 is attached to the extruded dust and plastic core 30 and is also made of waterproof or water resistant material such as cork, rubber, foam or waterproof balancing paper.

[0018] The plank 10 also has a grooved end 50 with profile 51 and channel 52 that matches with protruding end 60 having profile 61 and protrusion 62. The particular profiles are made according to a preferred design to allow the panels to be quickly locked together, typically without the use of adhesive. However, if desired, an adhesive may be applied to the profiles therefore joining planks together to create a more permanent bonding of adjacent planks. The matching profiles may be of the click-lock variety depicted in FIGS. 3a-d or a more traditional tongue and groove construction that generally requires the use of an adhesive.

[0019] FIG. 2 is an exploded view of the various layers that may be included in a plank or wall panel of the invention. The top layer 21 is an optional protective overlay or cover layer that is most desirable when the wear layer 20 is not particularly durable. Preferred top layer characteristics include transparency, hardness and scratch resistance. Exemplary materials for a top layer 21 include melamine resin with aluminum oxide and polyurethane. Wear layer 20 is less likely to benefit from a top layer 21 when comprised of a durable material such as tile or stone, or when the wear layer 20 already includes a protective hardener such as is the case with resin or vinyl encapsulated bamboo, wood or cork.

[0020] A bonding layer 22 joins the wear layer 20 to the core 30 and is typically, though not exclusively, a water resistant adhesive. A preferred adhesive type is a hot melt adhesive that can be applied during the manufacture of the engineered flooring or wall covering, at temperatures over 200 F., and more commonly over 250 F., and is therefore not suitable for convenient use at a residence or commercial establishment when flooring is being installed. The hot melt adhesive should be water resistant or nearly impervious to significant and prolonged exposure to moisture.

[0021] Another bonding layer 41 joins the underlayment layer 40 to the core 30. As with the first bonding layer 22, this second bonding layer 41 is also preferably a hot melt adhesive that is nearly impervious to moisture. The underlayment layer 40 is selected from a variety of possible materials depending upon the price point and functionality of the flooring or wall covering planks.

[0022] Planks according to the present invention are advantageously provided with click-lock edge systems, such as the protrusion 62 that co-operates with channel 52 and edge profiles 51, 61. Pervan, U.S. Pat. No. 6,023,907 and Morian, U.S. Pat. No. 6,006,486 disclose two of the leading edge fastening systems. FIGS. 3a-d show a variety of other click-lock edges. The system in FIG. 3a can be angled and snapped, FIG. 3b shows a snap joint, FIG. 3c can be angled and snapped but generally has less joining strength than the system of FIG. 3a. FIG. 3d also shows lock and fold panels with the first panel having a channel on the right edge being installed and the second panel being angled so that its protrusion enters the channel and the top edges of the two panels contact, and then rotating the second panel downward until the profiles are locked. When using click-lock edges, it is relatively straightforward to install floating flooring without adhesives. The particular edge system that is preferred for a particular plank may vary depending upon the dimensions and rigidity of the plank. It will also be understood that planks and panels according to the present invention can be installed using adhesives, and the adhesives can be applied to join the edges of the planks or to attach the planks to the subfloor or wall, or both.

[0023] The planks and panels according to the invention are generally rectangular having a thickness of up to about one inch (about 25.4 mm) and a width of between about 2 and 12 inches (about 50 mm to about 305 mm). In general, flooring planks will have a greater thickness than wall covering planks or panels. The use of recycled wood, cork or bamboo dust contributes to sustainability through the responsible management of resources, and provided bamboo, cork or sustainably harvested wood is used, results in an environmentally friendly building material.

[0024] The planks and panels manufactured according to the invention are nearly impervious to swelling and have great dimensional stability. These planks and panels exhibit variations due to moisture of less than 0.01%. The products can also be manufactured to tolerances of less than 0.25 mm of length, width and straightness, and many suitable wear layers provide colorfast and cleanable surfaces.

[0025] Numerous alterations of the structure herein disclosed will suggest themselves to those skilled in the art. However, it is to be understood that the present disclosure relates to the preferred embodiment of the invention which is for purposes of illustration only and not to be construed as a limitation of the invention. All such modifications which do not depart from the spirit of the invention are intended to be included within the scope of the appended claims.