Microwave cooking packages and methods of making thereof

摘要

A package with self-forming insulating walls includes a tray for supporting a food item, a flap joined to the tray along a fold line, and an insulating microwave material overlying at least a portion of the tray and at least a portion of the flap. The insulating microwave material may be joined to the flap. The insulating microwave material may include a microwave energy interactive material supported on a first polymer film layer, a moisture-containing layer joined to the microwave energy interactive material, and a second polymer film layer joined to the moisture-containing layer in a predetermined pattern, thereby defining a plurality of expandable cells between the moisture-containing layer and the second polymer film layer.

主权项

1. A microwave heating tray, comprising:
a first panel and a second panel foldably joined to one another; and an insulating microwave material overlying the first panel and the second panel, wherein the insulating microwave material comprises
microwave energy interactive material supported on a first polymer film layer,a dimensionally stable substrate joined to the microwave energy interactive material, anda second polymer film layer joined to the dimensionally stable substrate in a predetermined pattern so that expandable cells are defined between the dimensionally stable substrate and the second polymer film layer, wherein the insulating microwave material is joined to the second panel so that upon sufficient exposure to microwave energy, the expandable cells expand and the insulating microwave material contracts, wherein the contracting of the insulating microwave material moves the second panel from a first position substantially coplanar with the first panel to a second position oblique to the first panel.