Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Perforation by differential fluid pressure; or smoothing,...
Patent
1996-09-13
1998-08-11
Foelak, Morton
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Perforation by differential fluid pressure; or smoothing,...
264154, 264156, 2642106, 264300, 264570, 264DIG62, 264DIG70, 428131, 4283044, B29D 2700
Patent
active
057924120
ABSTRACT:
This invention relates to a process for forming a single-layer, durably wettable polymeric web having a plurality of apertures. This process comprises melting a mixture of at least one thermoplastic polymer and at least one migratable surfactant and extruding the mixture to form a single-layer, substantially continuous polymeric film. The film is then apertured using high pressure fluid flows. Aperture formation is conducted when the single-layer polymeric film has a contact angle of at least about 30.degree., to minimize wash-off of the surfactant impregnated in the polymer web. The invention also relates to durably-wettable apertured webs.
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Holzwarth Ronald Bernz
Lee Yann-Per
Wu Lanying
Foelak Morton
Linman E. Kelly
Rasser Jacobus C.
Roof Carl J.
The Procter & Gamble & Company
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