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Treatment of paperboard with polar organic compounds to provide microwave interactive stock
| Details |
Inventors: Quick, James R.; Mitchell, James W.;
Assignee: International Paper Company (Purchase, NY)
Primary Examiner: Reynolds; Bruce A.
Assistant Examiner: To; Tuan Vinh
Attorney, Agent or Firm: Ostrager, Chong & Flaherty
A microwave susceptor material which comprises a substrate such as paper or paperboard treated with a polar organic compound having microwave interactive characteristics. A salt, which is soluble in the polar organic compound, can be added to alter the microwave heating performance of the material. The invention provides susceptor materials useful for cooking food items in a microwave oven with enhancement of the quality of the cooked food, such as the browning and crisping of the food surface. The susceptor materials are formed by treatment of the substrates with the polar organic compounds under conditions that cause the polar organic compounds to penetrate the substrate. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In accordance with the invention, microwave susceptor materials are provided by treating a substrate with polar organic compounds having microwave interactive characteristics, which may be modified by the addition of salts to provide improved microwave heating characteristics.
The substrate material comprises paper, paperboard or polyester coated paperboard.
A microwave susceptor composite may be formed by the single step process of contacting the substrate with the polar organic compound in liquid form, either with or without added salt, and allowing the liquid composition to penetrate the substrate.
FIG.
1 is a schematic view of an apparatus 10, employed for preparation of the microwave susceptor materials of the invention process.
In general, the substrate is passed through a tank, 20 containing a liquid composition 42.
The substrate is removed from tank 20, and passed through additional rollers 30 and 32 to remove excess liquid to form the microwave susceptor material.
As shown in this illustration, the untreated substrate is wound on roll 12.
The untreated substrate is passed along from roll 12 and immersed in the liquid composition 42 moving through rollers 14 16 and 18.
The temperature of the liquid composition in tank 20 is maintained within the range of 145.
degree.
F.
to 500.
degree.
F.
, by an electric heater 22, which is controlled by a heater control unit 26.
A temperature sensor 24 is contained within the liquid composition 42 to monitor the temperature.
The higher the temperature the greater the degree of penetration of the liquid composition into the substrate.
Under preferred conditions, as illustrated in FIG.
1, the substrate is immersed in the liquid composition 42 between 15 and 60 seconds for optimum penetration of the liquid into the substrate.
Under these conditions the substrate becomes impregnated with the liquid composition throughout the entire substrate.
Preferred add-on levels to the substrate of the liquid composition are between 0
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