Loop tape for hook-and-loop fastener
A loop element for a hook-and-loop fastener has a substrate layer of a nonwoven having an outer face, a fleece cover layer on the outer face of the substrate layer, and an adhesive layer on the outer face securing the cover layer to the substrate layer. A multiplicity of loops formed of polymer threads are knitted into only the cover layer and project from an outer face thereof.
1. A loop element for a hook-and-loop fastener, the loop element comprising:
a substrate layer of a nonwoven having an outer face;
indicia on the outer face of the substrate layer;
a fleece cover layer on the outer face of the substrate layer;
an adhesive layer on the outer face securing the cover layer to the substrate layer; and
a multiplicity of loops formed of polymer threads worked into only the fleece cover layer and projecting from an outer face thereof.
2. The loop element defined in claim 1 wherein the fleece of the cover layer is made of uncrimped endless filaments.
3. The loop element defined in claim 1 wherein the nonwoven of the substrate layer is spun-bonded.
4. The loop element defined in claim 1 wherein the nonwoven of the substrate layer has a surface weight of 10 g/m 2 to 30 g/m 2 .
5. The loop element defined in claim 1 further comprising
a coating of thixotropic primer between the outer face and the indicia.
6. The loop element defined in claim 1 , further comprising
a coating between the outer layer and the indicia.
7. The loop element defined in claim 6 wherein the coating forms on the outer face a closed skin of a thickness of at least 5 μm.
8. The loop element defined in claim 1 , further comprising
a coating applied by a slot nozzle to the outer surface of the substrate layer, the indicia being printed on the coating.
9. The loop element defined in claim 1 , further comprising
a fine-pore coating on the outer surface, the indicia being printed on the coating.
10. The loop element defined in claim 1 wherein the outer face of the substrate layer is treated with a corona discharge or plasma process.
11. The loop element defined in claim 1 wherein the substrate layer and cover layer are adhered together by the adhesive layer over their entire contacting surfaces.
12. The loop element defined in claim 1 wherein the adhesive layer extends between the cover and substrate layers as a continuous frame along edges of the cover and substrate layers and as a plurality of spaced adhesive zones within the frame separated by adhesive-free zones.
13. The loop element defined in claim 12 wherein a ratio of area between adhesive zones and the area enclosed by the frame is 10 to 70%.
14. A loop element for a hook-and-loop fastener, the loop element comprising:
a substrate layer of a nonwoven having an outer face and formed of a plurality of strata of nonwoven, the stratum forming an inner face opposite the respective outer face being a spunbond;
a fleece cover layer on the outer face of the substrate layer;
an adhesive layer on the outer face securing the cover layer to the substrate layer; and
a multiplicity of loops formed of polymer threads worked into only the fleece cover layer and projecting from an outer face thereof.
15. A loop element for a hook-and-loop fastener, the loop element comprising:
a substrate layer of a nonwoven having an outer face;
a fleece cover layer on the outer face of the substrate layer;
an adhesive layer extending on the outer face between the cover and substrate layers as a continuous frame along edges of the cover and substrate layer and as a plurality of spaced adhesive strips, points, or dots within the frame separated by adhesive-free zones, the frame and the strips, points or dots securing the cover layer to the substrate layer; and
a multiplicity of loops formed of polymer threads worked into only the fleece cover layer and projecting from an outer face thereof.
16. A loop element for a hook-and-loop fastener, the loop element comprising:
a substrate layer of a nonwoven having an outer face;
a fleece cover layer on the outer face of the substrate layer and formed by two bonded-together fleeces of different filaments or fibers;
an adhesive layer on the outer face securing the cover layer to the substrate layer; and
a multiplicity of loops formed of polymer threads worked into only the fleece cover layer and projecting from an outer face thereof.
17. The loop element defined in claim 16 , further comprising
indicia on the outer face of the substrate layer.
18. A loop element for a hook-and-loop fastener, the loop element comprising:
a substrate layer of a nonwoven having an outer face;
a fleece cover layer on the outer face of the substrate layer;
an adhesive layer extending on the outer face between the cover and substrate layers as a continuous frame along edges of the cover and substrate layer and as a plurality of spaced adhesive zones within the frame separated by adhesive-free zones, the frame and the adhesive zones securing the cover layer to the substrate layer; and
a multiplicity of loops formed of polymer threads worked into only the fleece cover layer and projecting from an outer face thereof, a ratio of area between the adhesive zones and the adhesive-free zones being 40 to 60%.