High gloss disposable pressware
AssigneeGeorgia-Pacific Corporation
InventorsDean P. Swoboda, Jack D. Hultman, Darrell F. Krause
Life of this patent
Estimating the term…
Abstract
A high gloss, disposable pressed paperboard food container includes a glossy bilayer finish. The container is formed in a heated die set from a paperboard substrate provided with a first finish coating layer consisting essentially of a styrene-butadiene resin composition and a second, top coating finish layer consisting essentially of an acrylic resin composition applied to the first finish coating layer. The products of the invention typically exhibit a 60° gloss of greater than about 40 gloss units, as well as reduced moisture pickup and enhanced rigidity.
Claims35
A high gloss, disposable paperboard food container with a glossy bilayer finish formed in a heated die set from a paperboard blank,
- said paperboard blank being prepared from a paperboard substrate provided with a first finish coating layer consisting essentially of a styrene-butadiene resin composition and a second, top coating finish layer consisting essentially of an acrylic resin composition applied to said first finish coating layer, wherein said food container exhibits a surface gloss of at least about 40 gloss units at 60 degrees as measured by test method ASTM D523-89.
A method of making a high gloss paperboard food container comprising the steps of:
- a) preparing a coated paperboard substrate said paperboard substrate being provided with a first finish coating layer consisting essentially of a styrene-butadiene resin composition and a second top finish coating layer consisting essentially of an acrylic resin composition applied to said first layer;
- b) scoring said paperboard substrate in a predetermined pattern suitable for forming said high gloss paperboard food container;
- c) cutting said scored paperboard substrate into a shape appropriate for forming said high gloss paperboard food container;
- d) heat pressing said paperboard blank into said high gloss paperboard food container wherein said container is provided with a plurality of pleats and said food container exhibits a surface gloss of at least about 40 gloss units at 60° as measured by test method ASTM D523-89.
A coated paperboard for making a high gloss paperboard food container with a glossy bilayer finish wherein said container exhibits a surface gloss of at least about 40 gloss units at 60° as measured by test method ASTM D523-89 said coated paperboard comprising:
- a) a paperboard substrate sized with from about 4 pounds of starch per 3,000 square foot ream to about 15 pounds of starch per 3,000 square foot ream and provided with a clay coating;
- b) a first finish coating layer consisting essentially of a styrene-butadiene resin composition applied to said clay coating;
- and
- c) a second finish top coat layer consisting essentially of an acrylic resin composition applied to said first layer.
The coated paperboard according to claim 29, wherein said styrene-butadiene resin composition comprises a carboxylated styrene-butadiene resin.
A method of improving the wet rigidity of a disposable food container prepared from a paperboard blank in a heated die set, said paperboard blank being starch-sized and provided with a clay coating as well as a finish coating applied thereto and said disposable food container being provided with a plurality of pleats about its periphery;
- said method comprising providing said paperboard blank with a first finish coating layer consisting essentially of a styrene-butadiene resin composition applied to said clay coating and a second finish coating layer applied to said first finish coating layer consisting essentially of an acrylic resin composition.
Dependencies are inferred from the claim text.