PACKAGING PAPER BOX FOR USE IN MICROWAVE OVEN AND PACKAGE TO BE HEATED IN MICROWAVE OVEN USING IT AS OUTER PACKAGE

摘要

PROBLEM TO BE SOLVED: To provide a packaging paper box for use in a microwave oven with which contents do not leak out from a steam vent under any heating conditions by the microwave oven.

SOLUTION: The packaging paper box for use in a microwave oven is equipped on an upper face plate 2 with breaking lines (a) shorter than a width of the upper face plate in parallel to a top face plate in the vicinity of the top face plate 3 symmetrically across a tab 123 defined by a cutting line b. Breaking lines c are perforated from the leading and tail ends of the breaking line (a) upwardly from the upper face plate toward corners, and creases d are provided from the leading and tail ends of the breaking line toward both lower corners of the upper face plate. A crease e shorter than the width of a lower face plate is provided on a lower face plate 4 in parallel to the top face plate in the vicinity of the top face plate 3 correspondingly to the breaking line (a) on the upper face plate. Breaking lines f are perforated from the leading and tail ends of the crease e toward both upper corners correspondingly to the breaking lines on the upper face plate. Creases g are provided from the leading and tail ends of the crease e toward both lower corners on the lower face plate correspondingly to the creases d of the upper face plate.

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