Selectively microwave-permeable membrane susceptor systems
First Claim
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1. A microwave susceptor for use in food packaging, the susceptor comprising:
- (a) at least one substrate that is substantially transparent to microwave energy, the substrate having opposed surfaces;
(b) at least one microwave-absorptive coating disposed as a pattern upon a portion of one surface of the substrate, said at least one microwave-absorptive coating comprising a plurality of separate, electrically conductive regions; and
(c) at least one microwave-reflective coating disposed as a pattern overlapping said at least one microwave-absorptive coating to thereby modify the amount of microwave energy that reaches the microwave-absorptive coating when the susceptor is exposed to a microwave energy field, said microwave-reflective coating comprising a plurality of separate, electrically conductive regions.
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Abstract
A selectively permeable membrane microwave susceptor for use in food packaging is disclosed. The susceptor comprises a substrate having at least one absorbing coating and at least one reflecting coating deposited thereon. Either one or both of the absorbing coating or the reflecting coating can be varied to control the amount of microwave energy reaching the absorbing coating, thereby controlling the overall amount of susceptor heating.
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Citations
24 Claims
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1. A microwave susceptor for use in food packaging, the susceptor comprising:
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(a) at least one substrate that is substantially transparent to microwave energy, the substrate having opposed surfaces; (b) at least one microwave-absorptive coating disposed as a pattern upon a portion of one surface of the substrate, said at least one microwave-absorptive coating comprising a plurality of separate, electrically conductive regions; and (c) at least one microwave-reflective coating disposed as a pattern overlapping said at least one microwave-absorptive coating to thereby modify the amount of microwave energy that reaches the microwave-absorptive coating when the susceptor is exposed to a microwave energy field, said microwave-reflective coating comprising a plurality of separate, electrically conductive regions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A microwave susceptor for use in food packaging, the susceptor comprising:
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a substrate that is substantially transparent to microwave energy; at least two microwave-absorptive coating regions deposited as a pattern on at least one surface of the substrate, said microwave-absorptive coating regions capable of producing heat when exposed to microwaves and having a resistivity of about 75 ohms per square; and at least two microwave-reflective coating regions having a resistivity of about 10 ohms per square, said microwave reflective coating regions deposited as a pattern overlapping said microwave-absorptive coating regions.
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22. A microwave susceptor for use in food packaging, the susceptor comprising:
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(a) a substrate that is electrically non-conductive; (b) at least one microwave-absorptive, electrically conductive electrode disposed upon at least a portion of a surface of the substrate; and (c) a plurality of microwave-reflective, electrically conductive electrodes disposed overlapping said microwave-absorptive electrode as a plurality of electrically conductive regions. - View Dependent Claims (23, 24)
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Specification