Longitudinally pleated products
A method of forming a continuous sheet of pleated, hook-form, fastener product includes training a substrate about a pressure roll having an outer surface defining circumferential grooves. As the substrate approaches a nip between the pressure roll and a mold roll calendered with the pressure roll, a portion of the substrate is disposed within a corresponding one of the grooves between the pressure roll and a stationary horn extending into the groove whereby a longitudinally-extending pleat is formed in the substrate. The pleated substrate is then passed through the nip where resin regions are laminated to a side of the substrate opposed to the pleat.
1. A spooled, flexible, sheet-form product of finite width between longitudinal edges, the product having two regions of relatively greater thickness, separated by a longitudinally continuous region of relatively lesser thickness,
wherein the product is spooled in a pleated state in which, within each course, the region of relatively lesser thickness forms a longitudinal pleat overlying the product completely within the region of relatively lesser thickness.
2. The product of claim 1 , wherein in adjacent courses of the spooled product the regions of relatively greater thicknesses overlie one another.
3. The product of claim 1 , wherein the sheet-form product comprises a fabric substrate extending across its finite width through both the regions of relatively greater thickness and the regions of relatively lesser thickness.
4. The product of claim 3 , wherein the regions of relatively greater thickness comprise regions in which a base layer of resin is laminated to the fabric substrate.
5. The product of claim 4 , wherein the base layer of resin in each region of relatively greater thickness carries male touch fastener elements extending from the base layer.
6. The product of claim 5 , wherein the male touch fastener elements have discrete, spaced-apart resin stems extending from the base layer of resin.
7. The product of claim 5 , wherein the male touch fastener elements have heads that overhang the sides of their stems for engagement of fibers.
8. The product of claim 5 , wherein the male touch fastener elements are arranged with a density of 70 to 300 fastener elements per square cm.
9. The product of claim 5 , wherein the male touch fastener elements have a height, as measured from the base layer of resin from which they extend, of 0.2 to 0.6 mm.
10. The product of claim 4 , wherein the base layer of resin has a thickness of 0.1 mm or less, as measured from the fabric substrate.
11. The product of claim 1 , wherein the regions of lesser thickness comprise a flexible fabric with an exposed surface comprising hook-engageable fibers.
12. The product of claim 11 , wherein the hook-engageable fibers are on a surface of the flexible fabric, opposite a surface carrying male fastener elements.
13. The product of claim 11 , wherein the hook-engageable fibers are fibers of a nonwoven loop material.
14. The product of claim 1 , wherein the sheet-form product is pleated such that the longitudinal pleat extends essentially to edges of the regions of relatively greater thickness.
15. The product of claim 1 , wherein the longitudinal pleat is formed such that a spooled course thickness of the product at the longitudinal pleat is substantially equal to a spooled course thickness of the product in the regions of relatively greater thickness.
16. The product of claim 1 , wherein the longitudinal pleat is folded over unto itself, to produce at least three fabric substrate layers.
17. The product of claim 1 , wherein the sheet-form product comprises more than two of the regions of relatively greater thickness, with adjacent ones of the region of relatively greater thickness separated by a respective region of relatively lesser thickness.