Molded touch fasteners and methods of manufacture
View Patent ↗Touch fastener, molded articles having touch fasteners and methods of making such touch fasteners and articles are provided. The touch fasteners include a sheet form base having an upper face and a lower face; a plurality of male fastener elements, each fastener element having a stem molded integrally with and extending from the upper face of the sheet form base; and a foam or fibrous non-woven material adjacent to the upper face of the sheet form base, wherein at least a portion of the foam or fibrous non-woven material is disposed between at least a portion of the fastening elements.
1. A method of making a touch fastener having a sheet form base and a plurality of fastener elements extending from the base, the method comprising:
continuously introducing molten resin to a gap formed along a peripheral surface of a rotating mold roll, such that the resin forms at least a part of the sheet-form base at the peripheral mold roll surface and fills an array of fixed cavities defined in the rotating mold roll to form the fastener elements or portions thereof; while
continuously introducing a foam into the gap between the mold roll and the molten resin,
causing the foam to become physically bonded to the resin of the sheet form base and become part of the sheet form base of the product;
solidifying the resin; and
removing the solidified resin from the peripheral surface of the mold roll by pulling the fastener elements or portions thereof from their respective cavities.
2. The method of claim 1 , wherein the foam is lengthwise continuous and introduced as a running length.
3. The method of claim 1 , wherein the gap is defined between the mold roll and a counter-rotating pressure roll.
4. The method of claim 1 , wherein the gap is defined between the mold roll and an injection die.
5. The method of claim 1 , further comprising burning at least a portion of the foam.
6. The method of claim 1 wherein the cavities form preformed stems and the method further comprising flat-topping the stems to form fastener elements.
7. The method of claim 1 wherein the foam extends longitudinally beyond the sheet-form base.
8. The method of claim 1 wherein the touch fastener further comprises metal particles.
9. The method of claim 1 wherein the foam covers substantially the entire upper face of the sheet form base.
10. The method of claim 6 wherein the height of the foam is greater than the height of the fastener elements.