Net hook fasteners

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.

1 . 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. 
   
   
       2 . The method of  claim 1  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. 
   
   
       3 . The method of  claim 1  wherein the film has a thickness of from 25 to 1000 microns. 
   
   
       4 . The method of  claim 3  wherein the film has a thickness of from 50 to 500 microns. 
   
   
       5 . The method of  claim 1  wherein the peaks are formed by discrete ridge structures on opposite faces of a continuous film backing. 
   
   
       6 . The method of  claim 1  wherein the peaks are formed by an oscillating film backing. 
   
   
       7 . The method of  claim 5  wherein at least some of the peak forming ridges have hook shaped structures. 
   
   
       8 . The method of  claim 1  wherein there are at least 2 peaks per linear cm of the film. 
   
   
       9 . The method of  claim 1  wherein there are at least 5 to 50 peaks per linear cm of the film. 
   
   
       10 . The method of  claim 4  wherein at least some of the peak forming ridges have hook shaped structures.