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Packaging container for microwave ovenRelated Patent Categories: Food Or Edible Material: Processes, Compositions, And Products, Packaged Or Wrapped Product, Having Specific Electrical Or Wave Energy FeaturePackaging container for microwave oven description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070071855, Packaging container for microwave oven. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a Continuation of Application Ser. No. 10/580,831 which is a 371 of PCT/JP2004/017278, filed Nov. 19, 2004, and which claims benefit of Japanese Application No. 2003-399237 filed Nov. 28, 2003 and Japanese Application No. 2004-290168 filed Oct. 1, 2004; the above-noted applications incorporated herein by reference in their entirety. TECHNICAL FIELD [0002] The present invention relates to a packaging container for a microwave oven such as a packaging pouch, a cup, or a tray filled with contents such as a retort food containing a liquid substance, a solid substance, or a mixture of them. The packaging container of the present invention is capable of automatically releasing water vapor or the like to be generated inside the packaging container, preventing the rupture and deformation of the packaging container, scattering of the content, and allowing one to easily recognize the fact that the packaging container is opened under heating in a microwave oven. BACKGROUND ART [0003] Heating of a packing container such as a packaging pouch, a cup, or a tray hermetically filled with a retort food, a frozen food, or the like in a microwave oven increases the pressure inside the pouch and a container due to water vapor or the like to be generated from contents under heating. The packaging container may tear, and the content may scatter, to thereby make the inside of the microwave oven dirty or harm a human body by burning or the like. [0004] Thus, before heat-cooking such a packaging container in a microwave oven, methods of preventing tearing of the packaging container are employed. That is, the packaging container is partly opened in advance or the packaging container itself is pierced, to thereby discharge out water vapor or the like to be generated inside the packaging container. [0005] However, such methods involve much time and effort for a general consumer. Further, when these methods are applied, the methods have disadvantages in that a flavor of the contents cooked by heating is lost because the water vapor generated by microwave heating is immediately discharged out of the packaging container and a heat steaming effect of the water vapor on the content is reduced. [0006] To overcome such disadvantages, there have been proposed various packaging containers each provided with an automatic opening mechanism with which an increase in the inner pressure of the packaging container under heating in a microwave oven is automatically relieved (see, for example, Patent Documents 1 to 4). [0007] In each of those packaging containers, the opening of the packaging container by heating in a microwave oven can be judged on the basis of the sound of water vapor to be released on and after opening and clouding of the inside of the microwave oven due to the water vapor. However, this method of judging the opening is hard to recognize and may cause one to ignore the opening of a packaging container. [0008] To overcome such disadvantages, there has been proposed a container, a food pouch, and the like, each of which is specifically designed to be heated in a microwave oven and is coupled with a separate alarm whistle (see Patent Document 5). However, each of those containers requires a step of using a high-cost, separate alarm whistle and coupling the alarm whistle. Accordingly, there arises, for example, a problem in that the production process of each of the containers becomes complicated, which results in an increase in cost. [0009] Meanwhile, there has been also proposed an ordinary packaging pouch not heated in a microwave oven, a heat seal part of which is provided with a hidden printing layer so that a letter or symbol appears upon opening of the pouch to prevent, for example, mixing of a toxic substance or the like (see, for example, Patent Document 6). However, in such a packaging pouch, it becomes difficult to recognize a letter or symbol appearing upon opening unless an area of a portion to be provided with the hidden printing layer is equal to or larger than a certain value. Therefore, it has not been possible to apply this technique to a vapor release seal part opening automatically upon heating of a packaging container for a microwave oven such as a packaging pouch, a cup, or a tray. [0010] Patent Document 1: JP 10-59433 A [0011] Patent Document 2: JP 10-95471 A [0012] Patent Document 3: JP 10-101154 A [0013] Patent Document 4: JP 2002-249176 A [0014] Patent Document 5: JP 06-245861 A [0015] Patent Document 6: Japanese Utility. Model Application Laid-open No. 62-90334 A DISCLOSURE OF THE INVENTION [0015] Problems To Be Solved By The Invention [0016] Therefore, an object of the present invention is to provide a packaging container for a microwave oven such as a packaging pouch, a cup, or a tray constituted by a packaging material which itself is processed with no need for a special member or a complicated step so that one can easily recognize that heat-cooking of contents in the packaging container has been completed and the packaging container has automatically opened. Another object of the present invention is to provide a packaging container for a microwave oven capable of avoiding a risk of spilling contents in the packaging container or a risk of contact with an opening to cause a heat injury upon heating in a microwave oven. Means For Solving The Problems [0017] The inventors of the present invention have made extensive studies. As a result, they have found that the above-mentioned problems can be solved by providing, by means of printing processing or the like, a vapor release seal part having a weakened part of each of surface and back pack aging materials constituting a packaging container for a microwave oven such as a packaging pouch, a cup, or a tray with a mark developing means with which exfoliation opening of the vapor release seal part can be recognized by a difference between the surface and back packaging materials. Thus, the inventors have completed the present invention. [0018] That is, the present invention employs the following constitutions 1 to 15. [0019] 1. A packaging container for a microwave oven hermetically sealed by heat-sealing with a plastic film, the packaging container including a vapor release seal part having a weakened part, characterized in that the vapor release seal part is provided with a mark developing means with which exfoliation opening of the vapor release seal part can be recognized by a difference between surface and back packaging materials constituting the vapor release seal part. [0020] 2. A packaging container for a microwave oven according to the above item 1, characterized in that the mark developing means is constituted by providing a vapor release seal part of one plastic film constituting the packaging container with a printing layer having a pattern having a void part and by providing a vapor release seal part of the other plastic film constituting the packaging container with a printing layer having a pattern corresponding to the void part. [0021] 3. A packaging container for a microwave oven according to the above item 1, characterized in that the mark developing means is constituted by coloring a vapor release seal part of one plastic film constituting the packaging container a first color and by coloring a vapor release seal part of the other plastic film constituting the packaging container a second color different from the first color. [0022] 4. A packaging container for a microwave oven according to the above item 1, characterized by the mark developing means comprising a peeling surface of which opacifies or whitens in association with peeling due to cohesion failure of the vapor release seal parts of the plastic films constituting the packaging container. [0023] 5. A packaging container for a microwave oven according to the above item 4, characterized in that the mark developing means is constituted by providing a color printing layer for an upper layer of the vapor release seal part of at least one plastic film constituting the packaging container on a side of an external surface of the container. [0024] 6. A packaging container for a microwave oven according to any one of the above items 1 to 5, characterized in that the vapor release seal part is formed continuously along the peripheral edge seal part of the packing container. Continue reading about Packaging container for microwave oven... Full patent description for Packaging container for microwave oven Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Packaging container for microwave oven patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. 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