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US 4,226,828 AGranted
Process for producing a reticulated web net
AssigneeHercules Incorporated
InventorJohn N. Hall
Life of this patent
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Abstract
The invention is a process 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.
Claims3
A process for forming a reticulated web net comprising:
- providing a film of thermoplastic polymeric material;
- heating said film to a temperature suitable for thermoforming;
- then placing said film in contact with a perforated surface;
- then subjecting said film to a pressure differential to force portions of the film into the perforations of said perforated surface thus forming pips;
- then cooling said film to harden the film;
- then stripping the film from the perforated surface;
- then skiving off the pips substantially parallel to the surface of said film;
- and
- then biaxially stretching and orienting said film into a reticulated web net.
6 more elements
Dependencies are inferred from the claim text.