NET HOOK FASTENERS

• US 20080009821A1
• Filed: 07/10/2006
• Published: 01/10/2008
• Est. Priority Date: 07/10/2006
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Seth, Jayshree, Venne, Janet A.
• Granted Patent: US 7,622,180 B2
• Time in Patent Office: Days
• US Class Current: 604/391
• CPC Class Codes: A44B 18/0046 Fasteners made integrally of plastics
• CPC Class Codes: A44B 18/0061 Male or hook elements A44B18/0053 takes precedence
• CPC Class Codes: A61F 13/15699 Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs
• CPC Class Codes: A61F 13/15707 Mechanical treatment, e.g. notching, twisting, compressing, shaping
• CPC Class Codes: A61F 13/625 characterised by the hook
• CPC Class Codes: Y10T 24/27 including readily dissociable fastener having numerous, protruding, unitary filaments randomly interlocking with, and simultaneously moving towards, mating structure [e.g., hook-loop type fastener]
• CPC Class Codes: Y10T 428/24017 Hook or barb
• CPC Class Codes: Y10T 442/102 Woven scrim
• CPC Class Codes: Y10T 442/183 Synthetic polymeric fiber

Abstract

The present invention concerns a polymeric film hook netting comprising a continuous film backing having a net section formed of plurality of a first set of thermoplastic strands extending in a first direction and a second set of integral strands extending in a second direction at least one of which strands has upstanding hook elements and a second integral non-net film section.

Claims

1. A polymeric film hook netting comprising a continuous polymeric film backing having a net section and a second integral non-net film section, where the net section is formed of a first set of a plurality of thermoplastic strands extending in a first direction and a second set of a plurality of integral strands extending in a second direction at least one of which sets of strands has upstanding hook elements.

2. The polymeric film hook netting of claim 1 wherein the percent open area of the net section is at least 50 percent.

3. The polymeric film hook netting of claim 1 wherein the percent open area of the net section is at least 60 percent.

4. The polymeric film hook netting of claim 1 wherein the first set of strands extend in the transverse direction and are nonplanar and the second set of strands extend in the longitudinal direction and are nonrectilinear.

5. The polymeric film hook netting of claim 1 wherein at least one of said sets of strands are oriented strands.

6. The polymeric film hook netting of claim 5 wherein the other set of strands are not oriented and have a substantially rectilinear cross-section.

7. The polymeric film hook netting of claim 1 wherein at least one of said sets of strands are linear.

8. The polymeric film hook netting of claim 1 wherein both sets of strands are nonlinear.

9. The polymeric film hook netting of claim 1 wherein said hook elements extend in the direction of one of the sets of strands.

10. The polymeric film hook netting of claim 1 wherein said hook elements extend in two or more directions.

11. A fastening tab for an article comprising a polymeric film hook netting having a continuous film backing having a net section formed of plurality of a first set of thermoplastic strands extending in a first direction and a second set of integral strands extending in a second direction at least one of which strands has upstanding hook elements and a second integral non net film section for attachment to the article.

12. The fastening tab of claim 11 wherein the non net section is coated with a pressure sensitive adhesive

13. The fastening tab of claim 11 wherein the percent open area of the net section is at least 50 percent.

14. The fastening tab of claim 11 wherein the percent open area of the netting is at least 60 percent.

15. The fastening tab of claim 11 wherein the first set of strands extend in the transverse direction and are nonplanar and the second set of strands extend in the longitudinal direction and are nonrectilinear.

16. The fastening tab of claim 11 wherein at least one of said sets of strands are oriented strands.

17. The fastening tab of claim 16 wherein the other set of strands are not oriented and have a substantially rectilinear cross-section.

18. The polymeric film hook netting of claim 17 wherein said hook elements extend in the direction of one of the sets of strands.

19. A method for forming a thermoplastic polymeric netting comprising extruding a film comprising a first three dimensional polymer film section having a series of ridges extending as peaks and valleys from a top surface to a bottom surface, which peaks and valleys extend in a first direction forming continuous ridges, and simultaneously extruding a second substantially continuous planar backing section having a substantially planar backing, cutting said three dimensional film section on at least one face in a second direction at an angle to said first direction at multiple cut lines substantially through the film so as to form a plurality of cut portions without cutting through the backing of the second substantially planar backing section, orienting said cut film in said first direction so as to separate said cut portions forming a net section with a set of separated strands connected by uncut portions and a non net section formed by the uncut backing of the planar backing section.

20. The method of claim 19 wherein the three dimensional film section has at least one ridge formed into a hook shaped profile that is cut by the multiple cut lines forming a net hook section.

21. The method of claim 19 wherein the film has a thickness of from 25 to 1000 microns.

22. The method of claim 21 wherein the film has a thickness of from 50 to 500 microns.

23. The method of claim 19 wherein the peaks are formed by discrete ridge structures on opposite faces of a continuous film backing.

24. The method of claim 19 wherein the peaks are formed by an oscillating film backing.

25. The method of claim 23 wherein at least some of the peak forming ridges have hook shaped structures.

26. The method of claim 19 wherein there are at least 2 peaks per linear cm of the film.

27. The method of claim 19 wherein there are at least 5 to 50 peaks per linear cm of the film.

28. The method of claim 22 wherein at least some of the peak forming ridges have hook shaped structures.