Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Making hole or aperture in article
Reexamination Certificate
2004-12-17
2010-06-08
Griffin, Steven P (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Making hole or aperture in article
C264S175000, C264S176100, C264S304000, C264S466000, C264SDIG070, C425S290000, C425S336000, C425S471000, C425SDIG037
Reexamination Certificate
active
07731878
ABSTRACT:
A process of forming a microperforated plastic film includes providing a post tool having multiple posts, bringing plastic into contact with the post tool such that the plastic conforms to the shape of the posts, and solidifying the plastic into a solidified plastic film having a plurality of microperforations in the shape of the posts. Another step in the process is displacing any skins formed over the holes after solidifying the plastic. The process may be used to form a film for sound absorption where the posts are shaped and arranged to provide microperforations that provide a particular sound absorption spectrum. In one embodiment, the microperforations each have a narrowest diameter of20mils, a narrowest diameter less than a film thickness, and a widest diameter greater than narrowest diameter. The widest diameter may be about 125% or more of the narrowest diameter in an embodiment.
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3M Innovative Properties Company
Griffin Steven P
Malekzadeh Seyed Masoud
Wood Kenneth B.
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