Construction underlayment
Rigid foam-core construction underlayment is formed to have one broad side covered by a flexible substrate that carries a series of spaced-apart, discrete regions (such as islands or spaced lanes) of resin, each resin region carrying a respective field of male touch fastener elements extending away from the substrate and exposed for engagement, such as by fibers on an inner surface of exterior construction material, such as a roofing membrane.
1. A fastening product comprising:
a substrate having a side surface; and
parallel resin lanes secured to the side surface, each resin lane comprising a resin base layer from which touch fastener elements integrally extend;
wherein each resin base defines multiple bend points spaced apart along its length, the bend points comprising grooves extending laterally along a width of the resin base, such that at each bend point the resin base is of lesser thickness than a nominal thickness of the resin base between adjacent bend points.
2. The fastening product of claim 1 , wherein the bend points of neighboring resin bases are lengthwise staggered.
3. The fastening product of claim 1 , wherein the bend points of neighboring resin bases are lengthwise aligned.
4. The fastening product of claim 1 , wherein the grooves comprise V-grooves.
5. The fastening product of claim 1 , wherein the grooves are defined by molded lane surfaces.
6. The fastening product of claim 1 , wherein the side surface of the substrate is exposed between adjacent resin lanes.
7. The fastening product of claim 1 , wherein the lanes extend along an entire length of the substrate.
8. The fastening product of claim 1 , wherein each resin lane is bounded by adjacent exposed regions of substrate surface that are narrower than the lane.
9. The fastening product of claim 1 , wherein the touch fastener elements of each resin lane have individual resin stems extending integrally from a surface of the resin base layer.
10. The fastening product of claim 1 , wherein the substrate comprises a sheet of paper underlying all of the resin lanes.
11. The fastening product of claim 1 , wherein the substrate is porous.
12. The fastening product of claim 1 , wherein the substrate comprises a non-woven fabric.
13. The fastening product of claim 1 , wherein the touch fastener elements are arranged in arrays of rows and columns on each resin base layer.
14. The fastening product of claim 13 , wherein the arrays of touch fastener elements on the resin lanes together cover between 85 and 95 percent of a total area of the substrate.
15. The fastening product of claim 1 , wherein each resin base layer is mechanically secured to the substrate by resin of the base layer encapsulating surface features of the substrate.
16. The fastening product of claim 1 , wherein each resin base layer is bonded to the substrate by an adhesive.
17. The fastening product of claim 1 , wherein the substrate comprises a facing of a foam board.