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US 5,096,650 AGranted
Method of forming paperboard containers
AssigneeNetwork Graphics, Inc.
InventorDouglas J. Renna
Life of this patent
Estimating the term…
Abstract
A paperboard, containing a major portion of cellulose and a minor portion of an uncured biodegradable latex polymer, is molded into a shaped packaging form.
Claims4
A process for preparing a formed paperboard body comprising the steps of providing a paperboard sheet having a major portion of cellulose fibers and a minor portion of an uncured latex polymer;
- heating said sheet to approximately the glass transition point of the polymer, but below that temperature at which the polymer coverts to a non-soluble state;
- introducing said sheet into a mold having the shape of the desired body and subjecting said heated sheet within said mold to pressure for a period of time sufficient to form said body and set said latex into fixed form;
- removing said body from said mold;
- and cooling said body.
1 more element
Dependencies are inferred from the claim text.