The present invention relates generally to an artificial grass product and a method for making the same.
In an embodiment, the invention is directed to a face spinneret and/or nylon face fiber having a certain shape and dimension which impart improved characteristics to the fiber, such a softer feel and a reduced sheen. In another embodiment, the invention is directed to a thatch spinneret and/or nylon thatch fiber having a certain shape and dimension which impart improved characteristics to the fiber, such a softer feel and a reduced sheen.
A full and enabling disclosure of the present invention, including the best mode thereof directed to one of ordinary skill in the art, is set forth in the specification, which makes reference to the appended drawings, in which:
Elements illustrated in the figures are not necessarily drawn to scale. Repeat use of reference characters in the present specification and drawings is intended to represent the same or analogous features or elements of the invention.
Reference will now be made in detail to embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment may be used on another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents.
In an embodiment, the artificial grass product of the present invention comprises nylon. Nylon has a high melt temperature and is resilient under deformation (i.e. it tends to retain its deformed shape). However, nylon typically does not inherently have a soft, grass-like feel underfoot and has a sheen that causes it to appear too shiny and unnatural. Accordingly, polypropylene and polyethylene are typically utilized for artificial grass products. Alternatively, currently, nylon may be chemically modified to provide a product with a softer feel and a more natural appearance. Though hard work and ingenuity, however, the present inventor has developed a nylon artificial grass product which has a soft feel and a natural appearance without chemical modification of the nylon itself. In an embodiment, the nylon yarns of the present invention achieve their characteristics and advantages due to their physical form, shape, and dimensions.
In an embodiment, the artificial grass product of the present invention at least partially comprises nylon. In an embodiment, artificial grass product of the present invention comprises 100% nylon. In an embodiment, the nylon has not been chemically modified. In an embodiment, the invention comprises both face fibers and thatch fibers and both the face fibers and the thatch fibers of the invention comprise nylon.
In an embodiment, the fibers of the artificial grass product of the invention are produced via a specific spinneret profile (exemplary embodiments shown in
Referring to the drawings,
Generally speaking, the face spinneret (
In an embodiment shown in
As noted, in an embodiment, the face fiber 10 additionally comprises a plurality of convex body portions 34 which extend arcuately outwardly from the first side 12 of the face fiber and which are disposed along the width 36 of the fiber and are disposed at a ninety-degree angle (or approximately at a ninety-degree angle) from that of the convex end portions 33. In an embodiment, the convex body portions 34 extend outwardly from the first side 12, perpendicular to the longitudinal direction C-C. In an embodiment, the convex body portions 34 extend in the thickness direction, away from the center C-C of the fiber thickness 38.
In an embodiment, the face fiber 10 additionally comprises concave body portions 32 which may have the same or a similar (but opposite) radius of curvature as the convex portions 34 of the face fiber 10. In an embodiment, each concave portion 32 is adjacent a convex portion 34 along the first side 12 of the fiber 10. In an embodiment, each convex portion 34 of the face fiber 10 curves gradually into the adjacent concave portion 32 and vice versa.
As shown in
In an embodiment, the yarn shown in
In an embodiment, the yarn shown in
In an embodiment, the yarn shown in
Generally speaking, a cross-sectional view of the thatch yarn 20 of the invention comprises an elongated shape, though not as elongated as that of the face yarn 10 in an embodiment. In an embodiment, the width of the face yarn 10 may be about one and a half times that of the thatch yarn 20. In an embodiment, the thatch yarn 20 is different from the face yarn 10 in at least one of thickness, width, and shape configuration.
In an embodiment, the thatch yarn 20 comprises a combination of linear or planar surfaces and curved surfaces, when viewed in cross-section. In an embodiment of the thatch spinneret shown in
In an embodiment, one or more second angular protrusions 44 may extend perpendicular to and away from the longitudinal direction G-G. In an embodiment, a second angular protrusion 44 is disposed adjacent each side of the central angular protrusion 42, on a first side 22 of the thatch yarn 20. In an embodiment, the one or more second angular protrusions 44 may comprise triangular shapes or may be flattened triangles, such that the outermost end of the triangle is flattened and is parallel to the longitudinal direction. In an embodiment, the angle of each side of the second angular protrusions 42 is equal. In an embodiment, each of the second angular protrusions 42 has the same size, angles, and dimensions. In an embodiment, one or more second angular protrusions 42 are disposed on the second side 28 of the width of the yarn 20, symmetrically with those of the first side. In an embodiment, the width of the one or more second angular protrusions 44 may be less than the width of the central angular protrusion 42.
Adjacent each second angular protrusions 44, moving toward the end 24 of the fiber 20 in a cross-sectional dimension, the thatch fiber 20 may comprise one or more convex thatch portions 46. The convex thatch portions 46 may be continuously curved or may comprise a series of angles which appears to the naked eye to comprise a curvature. For example, the perimeter of the convex thatch portions 46 may comprise a smooth curve or may comprise three of more linear panels which appear to approximate a curve. The middle panel of the convex thatch portions 46 may be flattened and may be parallel with the longitudinal direction G-G, in an embodiment. For example, in an embodiment, the convex thatch portions 46 may comprise half-hexagonal shapes. In an embodiment, the width of the convex thatch portions 46 may be less than the width of the one or more second angular protrusions 44.
Finally, the thatch fiber 20 may comprise a bulbous end portion 48 on each longitudinal end 24 of the fiber. The bulbous end portions 48 may be semi-circular in an embodiment, curving convexly outwardly. In another embodiment, the bulbous end portions 48 may comprise a plurality of angular panels which approximate the appearance of a curvature. For example, the bulbous end portions 48 may be semi-hexagonal or semi-octagonal. In an embodiment, the width of the bulbous end portions 48 may be less than the width of the one or more convex thatch portions 46.
As shown in
Likewise, the convex thatch portions 46 on the first side 22 of the fiber 20 may be disposed opposite (relative to the width 47 of the thatch fiber 20) another convex thatch portions 46 on the second side 28 of the fiber 20. That is, line D-D is taken through the width 47 of the thatch fiber 20 and intersects the center of a convex thatch portion 46 on each side of the width 47. As can be seen, the valleys 45 between each angular protrusion 42, 44, convex thatch portion 46, and/or bulbous end portions 48 are also aligned and are not staggered, in an embodiment.
In this embodiment, the angular protrusions 42, 44 and the convex thatch portions 46 are not staggered but are, instead, aligned along the width 47 (or the longitudinal direction G-G) of the thatch fiber 20. In an embodiment, the cross-section of the thatch fiber 20, including its angular protrusions 42, 44, convex thatch portions 46, and bulbous end portions 48, is symmetrical. In an embodiment, thatch fiber 20 comprises, per longitudinal side, one central angular protrusion 42, two second angular protrusions 44 on either side of the central angular protrusion 42, convex thatch portions 46 on either side of the second angular protrusions 44, and two bulbous end portions 48 on each end 24 of the fiber. The variations in curvature and angularity of the thatch yarn 20 provides a reduction in luster and variance in visual appearance, providing a more natural appearance and feel to the artificial turf product.
In an embodiment, the yarn shown in
In an embodiment, the thickness of the thatch fiber 20 is variable along its width. That is, near the ends 24, the thatch fiber may be less thick then near the center of the fiber. In the central portion of the thatch fiber 20, the fiber may be thicker than the remainder of the fiber. In an embodiment, the thickness of the thatch fiber (or its extensions) increases gradually from the ends 24 to the central portion of the fiber.
In an embodiment, the yarn shown in
In an embodiment, the yarn shown in
In an embodiment, the height of the face fibers is greater than the height of the thatch fibers. The height is determined from the upper surface of the backing to the top of the extended fibers, in a normal state of the turf. In an embodiment, the face and thatch fibers are upright-oriented cut-pile fibers and may be arranged in bundles of synthetic grass fibers. In an embodiment, face yarns and thatch yarns may be tufted together in a given bundle of fibers. In other embodiments, face yarn bundles and thatch yarn bundles may be tufted in adjacent, but alternating locations. In still other embodiments, face yarn bundles and thatch yarn bundles may be tufted in seemingly random locations. In such an embodiment, they are not necessarily present in adjacent, alternating positions.
Advantageously, the invention having the disclosed shapes, configurations, and dimensions provides good flexing and bending characteristics, a soft feel, a natural look, and durability. In an embodiment, the artificial turf invention described herein may be used on sports fields, artificial residential or commercial lawns, or for any other use known in the art.
In an embodiment, the synthetic grass product of the invention comprises at least two yarn ends, the yarn provided on a cone to be tufted through backing as face fabric or thatch fabric tufts. In an embodiment, the synthetic grass product of the invention is a single yarn. In another embodiment, the invention comprises multiple inventive yarns (optionally of varied colors) directed through the same opening of a backing material. Similarly, in an embodiment, the synthetic grass product of the invention comprises a roll or sheet of artificial grass tufted through a backing. In an embodiment, the backed synthetic grass product of the invention comprises face fiber tufts and thatch fiber tufts. In an embodiment, face fiber tufts are disposed adjacent thatch fiber tufts in the backing.
In an embodiment, the face fiber tufts comprise a plurality of filaments or strands. In an embodiment, the face fiber tufts comprise a plurality of filaments or strands which are different colors. In an embodiment, the thatch fiber tufts comprise a plurality of filaments or strands. In an embodiment, the thatch fiber tufts comprise a plurality of filaments or strands which are different colors. In an embodiment, a plurality of yarns (face or thatch) are tufted through the same opening in the backing material. In an embodiment, the melting point of the synthetic grass product of the invention is above 420 degrees Fahrenheit.
In an embodiment, the backed turf product of the invention has a pile height of at least about 0.6 inch. In another embodiment, the backed turf product of the invention has a pile height of at least about 1.0 inch. In an embodiment, the extruded ribbons of the invention may comprise between about 300 and 2500 denier. In another embodiment, the extruded ribbons of the invention may comprise between about 600 and 2000 denier.
Method:
In an embodiment, the method includes, not necessarily in this order, the following steps: extruding a pellet through a spinneret to form an extended ribbon; optionally, combining the extended ribbon with a blend of other extruded ribbons; cutting the extended ribbon(s) to create a yarn that has a specified length; and tufting the yarns into a backing material. In an embodiment, the pellet is a nylon material. In an embodiment pellets of varied colors are used to create ribbons and, thereby, yarns having differing colors. The backing material may include a foam pad and/or a subsurface in some embodiments. A fill material may be added on top of the backing if desired. While the invention is described as being tufted, the inventive yarns may alternatively be used in a woven or knitted artificial grass product.
The accompanying figures are provided for explanatory purposes. The components that are illustrated are not necessarily drawn to scale. Many modifications and other embodiments of the inventions set forth herein will come to mind to one skilled in the art to which these inventions pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the inventions are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.