Coated paperboard and paperboard containers having a...

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 19/82 (2006.01) B65D 81/34 (2006.01) D21H 19/58 (2006.01)

Patent

CA 2233825

An improved, coated microwaveable paperboard or container useful for forming substantially rigid food containers such as plates, bowls, trays and the like and a process from producing the improved, coated paperboard is provided. The microwaveable paperboard and food containers. at a temperature in excess of 430°F evolves less than 0.1 milligrams of benzene per square inch, preferably less than 0.04 milligrams. Said paperboard and food containers are produced from a sized paperboard blank wherein a base coat and top coat comprise a mixture of an inorganic pigment and aliphatic copolymers. A base coat comprising an aliphatic latex and a pigment is applied directly to the paperboard, and a top coat comprising the same or different aliphatic polymer latex and a pigment is applied directly to the base coat to form the coated containers. Microwave susceptor layers are coated on the top coat. These containers are used to microwave and brown food at temperatures in excess of 430°F without evolving more than 0.1 milligrams of benzene per square inch of the container surface. The coated containers are also characterized by improved grease, oil, and cut resistance, improved varnish gloss, enhanced smoothness, and improved printing quality.

Cette invention concerne un carton amélioré pour micro-ondes utile pour la fabrication de récipients alimentaires essentiellement rigides tels que plats, bols, barquettes et autres, et un procédé de fabrication du carton revêtu amélioré. Le carton pour micro-ondes et les contenants alimentaires portés à une température dépassant 430 degrés F libèrent moins de 0,1 milligramme de benzène par pouce carré et, de préférence, moins de 0,04 milligramme. Le carton et les contenants sont réalisés à partir d'ébauches revêtues dont les couches d'enduction primaire et secondaire comprennent un mélange de pigments inorganiques et de copolymères aliphatiques. Une couche primaire composée de latex aliphatique et de pigment est appliquée directement sur le carton, et la couche secondaire de même composition ou de composition différente est appliquée directement sur la couche primaire. Ce revêtement multicouche reçoit alors des couches de matériaux interactifs. Les récipients visés par l'invention servent à cuire et à faire brunir les aliments au four à micro-ondes à des températures dépassant 430 degrés F; ils dégagent moins de 0,1 milligramme de benzène par pouce carré. Ils sont également caractérisés par une résistance améliorée aux graisses, aux huiles et aux coupures, un fini brillant et une douceur améliorés, ainsi qu'une imprimabilité rehaussée.

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