Biodegradable food trays

Details Biodegradable food trays Biodegradable food trays

1990-09-07

1992-10-13

Bottalow, Edith L.

Stock material or miscellaneous articles

Composite

Of carbohydrate

162146, 162180, 229 25R, B32B 2104

Patent

active

051549824

ABSTRACT:
A biodegradable food tray is thermoformed from one or two sheets composed of a major proportion of virgin wood pulp and minor proportions of polyolefin synthetic pulp, clay and cationic dispersed rosin, the sheets optionally containing a non-toxic coloring dye, the thermoforming of the tray acting to melt the synthetic pulp and rosin, thereby fusing the sheet to form a tray which is imperforate to penetration by grease over an extended period of time. Optionally, the sheets may be thermoset under heat and pressure without deformation to form grease proof sheets for use as such. In its method aspects, the invention contemplates the formulation of the furnish and its formation into sheets and trays.

REFERENCES:
patent: 3795575 (1974-03-01), Gouw
patent: 3802959 (1974-04-01), Francis et al.
patent: 3936347 (1976-02-01), Nomura
patent: 4210487 (1980-07-01), Driscoll
patent: 4274915 (1981-06-01), Munari
patent: 4291781 (1981-09-01), Niguchi et al.
patent: 4496427 (1986-01-01), Davison
patent: 4904520 (1990-02-01), Dumas et al.
patent: 4980337 (1990-12-01), Kawaski
patent: 5001033 (1991-03-01), Takeno et al.

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