Golf mat
A golf mat includes artificial grass fibers attached to and extending upward from a backing material, which may be one or more layers. The artificial grass fibers include groups of at least two different kinds of fiber sewn through a common path in the backing material. One of the kinds of fibers in each group is shaped so as to appear like a blade of grass. The other kind of fiber in each group is pre-stressed/crimped so that the relaxed shape of the fiber is nonlinear, resembling a curlicued or articulated form having lateral excursions. The lateral excursions cause portions of one such pre-stressed fiber to overlap and interfere with another, forming a mesh. The height of the pre-stressed fibers in their relaxed state in the turf is less than the height of the relatively unstressed artificial grass fiber(s). The crimped fibers form a resilient mat with impact characteristics similar to natural turf.
1. A method of manufacture of a golf mat providing initial resistance, followed by secondary resistance resisting bottoming out, to a golf club head impacting the mat, the method comprising:
(a) providing a mat backing suitable for receiving fiber tufts,
(b) tufting into the backing a plurality of groups of fibers, wherein each group includes:
(i) a combination of at least one resilient first fiber pre-stressed so as to have a curlicued shape when not under tension, and
(ii) at least one second fiber shaped to resemble a grass blade, and wherein the tufting comprises sewing each of the first and second fibers of each group using a single needle through a common path through the backing, while applying tension to hold the first fibers during sewing,
(d) cutting the first and second fibers and releasing them from a sewing machine to extend from the backing to a cut end,
(e) permitting the first fibers to retract into their pre-stressed non-linear shape and to overlap to form a mesh of fibers resembling natural grass thatch at a level below that of the second fibers extending above the mesh, wherein the second fibers provide initial resistance to a golf club head impacting the mat, and the first fibers provide secondary resistance to a golf club head reducing shock and resisting bottoming out, and wherein the second fibers extend from the backing a second height, wherein the second height is in the range of ⅞ to 3 inches, and the curlicued fibers extend from the backing a first height, wherein the first height is in the range of ⅝ to 2 inches.
2. A method as recited in claim 1 wherein the groups are spaced apart such that the curlicued first fiber of one group overlaps the curlicued first fiber of an adjacent group thereby providing a mesh of overlapping first fibers.
3. A method as recited in claim 2 wherein the groups of first fibers are in rows separated by distances in the range of 0.350 to 0.375 inch.
4. A method as recited in claim 1 wherein the first fiber is made from nylon.
5. A method as recited in claim 1 wherein the second fiber is made from polyethylene.