US Patent No. 10,335,973

HYDRO-FORMED FILM WITH THREE-DIMENSIONAL MICRO-APERTURES


Patent No. 10,335,973
Issue Date July 02, 2019
Title Hydro-formed Film With Three-dimensional Micro-apertures
Inventorship Paul Eugene Thomas, Terre Haute, IN (US)
Assignee TREDEGAR FILM PRODUCTS CORPORATION, Richmond, VA (US)

Claim of US Patent No. 10,335,973

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.