Process for encapsulation of cellulose based substrate using non-electromagnetic heating
AssigneeWeyerhaeuser Company
InventorsBrian C. Horsfield, Gerald Wilhite
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Abstract
A method for encapsulating a cellulose based substrate with polymeric films involves heating the respective films using a non-electrogmagnetic radiation heating source and providing a pressure differential between an environment defined between the films and an environment external to the films so that conformance of the film to the cellulose based substrate is promoted. The cellulose based substrate is entirely encapsulated by the films and the films are sealed around the peripheral edges of the container as well as edges that are defined adjacent slots and cutouts.
Claims14
A method for encapsulating a cellulose based substrate with a polymeric film, the method comprising:
- providing a cellulose based substrate, the cellulose based substrate having a first surface, a second surface opposite the first surface, and a cellulose based substrate periphery;
- providing a first polymeric film adjacent the first surface and extending beyond the cellulose based substrate periphery;
- providing a second polymeric film adjacent the second surface and extending beyond the cellulose based substrate periphery, the first film and second film defining an envelope that substantially encapsulates the cellulose based substrate;
- increasing the temperature of the first polymeric film adjacent the first surface and the second polymeric film adjacent the second surface using a non-electromagnetic radiation heating source such that steam is generated within the envelope;
- providing a pressure differential between an environment within the envelope and an environment outside the envelope;
- and
- bonding the first polymeric film to the second polymeric film adjacent the cellulose based substrate periphery.
Dependencies are inferred from the claim text.