| 摘要 |
The present invention discloses a novel monolithic construction food container which can be heated in a microwave oven without distortion of its shape, without interfering with or overloading the microwave energy beam or the microwave radiant energy generation unit and without leakage even when the contained food reaches a boiling point. The food container comprises an impermeable cavity defined by a continuous seamless wall with a periphery, having no folded gussets and preferably polygonal in shape and a set of at least two flaps which are joined, preferably integrally and seamlessly, to the top peripheral portion of the cavity. The container is made of a thermoplastic polymeric material having a glass transition temperature of at least -(negative) 20 degrees Celsius and/or a Heat Distortion Temperature. , measured under a stress of 264 psi, in accordance with ASTM Standard Method No. D648, of at least 48 degrees Celsius.
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