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US 4,289,464 AGranted
Reticulated web making apparatus
AssigneeHercules Incorporated
InventorJohn N. Hall
Life of this patent
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Abstract
The invention is a process and apparatus for forming a reticulated web net oriented from a perforated film wherein the perforated film is produced by thermoforming projections or pips on an endless perforated surface and subsequently skiving the pips off flush with the film, said thermoforming, skiving and orientation all taking place in a continuous fashion.
Claims4
Apparatus for forming a reticulated web net comprising:
- film supply means providing a thermoplastic polymeric film in a thermoformable condition;
- perforated continuous surface means adjacent said film supply means, said film contacting the surface of said perforated continuous surface means;
- pressure differential means adjacent said perforated continuous surface means to force portions of said film into the perforations of said surface thus forming pips, wherein the thickness of said continuous surface means is greater than the length of said pips;
- cooling means positioned adjacent said pressure differential means and said perforated continuous surface means to harden said film;
- stripping means adjacent said cooling means to strip the film from said perforated continuous surface means;
- skiving means adjacent said stripping means to cut off said pips at the surface of the film thereby creating the perforated film;
- and
- orienting means adjacent said skiving means to biaxially orient the film into a reticulated web net.
5 more elements
Dependencies are inferred from the claim text.