US 10,335,973 B2
Hydro-formed film with three-dimensional micro-apertures
Paul Eugene Thomas, Terre Haute, IN (US)
Assigned to TREDEGAR FILM PRODUCTS CORPORATION, Richmond, VA (US)
Filed by Tredegar Film Products Corporation, Richmond, VA (US)
Filed on Dec. 9, 2016, as Appl. No. 15/374,567.
Claims priority of provisional application 62/266,256, filed on Dec. 11, 2015.
Prior Publication US 2017/0165880 A1, Jun. 15, 2017
Int. Cl. B26F 1/26 (2006.01); A61F 13/511 (2006.01); A61F 13/512 (2006.01); A61F 13/513 (2006.01); B29C 41/26 (2006.01); B29C 41/28 (2006.01); B29C 41/38 (2006.01); B29C 41/50 (2006.01); A61F 13/15 (2006.01); B29L 31/48 (2006.01); B29K 101/12 (2006.01); B29L 7/00 (2006.01); B29C 51/10 (2006.01); B29D 28/00 (2006.01)
CPC B26F 1/26 (2013.01) [A61F 13/15731 (2013.01); A61F 13/512 (2013.01); A61F 13/5121 (2013.01); A61F 13/5126 (2013.01); A61F 13/51104 (2013.01); B29C 41/26 (2013.01); B29C 41/28 (2013.01); B29C 41/38 (2013.01); B29C 41/50 (2013.01); A61F 13/5122 (2013.01); A61F 2013/15284 (2013.01); A61F 2013/15829 (2013.01); A61F 2013/5127 (2013.01); A61F 2013/51147 (2013.01); A61F 2013/51338 (2013.01); B29C 51/10 (2013.01); B29C 2791/006 (2013.01); B29C 2791/007 (2013.01); B29C 2793/0045 (2013.01); B29D 28/00 (2013.01); B29K 2101/12 (2013.01); B29L 2007/00 (2013.01); B29L 2031/4878 (2013.01); Y10T 428/24182 (2015.01); Y10T 428/24281 (2015.01)] 12 Claims
OG exemplary drawing
 
1. A film comprising:
a polymeric web having first and second opposing, substantially planar web surfaces; and
a plurality of three dimensional perforations through the polymeric web, each three dimensional perforation comprising a hollow protrusion extending from the first planar web surface, each protrusion having an apex, an opening at the apex having a circumference defined, at least in part, by a plurality of irregularly shaped petals, and an elliptical cross-section parallel to the planar surface of the web, the elliptical cross-section having a protrusion axis ratio in a range of 0.65 to 1.35,
wherein the plurality of three dimensional perforations were formed using a hydroforming process, and
wherein the localized protrusions are formed in the web in a two-dimensional pattern having a mesh count in a range of about 40 to about 75.