| 摘要 |
A package is described comprising a bag with a pair of face D joined by longitudinally extending centrally projecting gussets. The bottom of the bag has a strong permanent seal and the top has a rupturable seal formed from thermoplastic adhesive that allows the top to open during popping to form a vent. The bottom seal includes adhesive seals that extend diagonally from the center of the bag obliquely toward the side edges and is pinched shut to provide a fin seal across the entire lower end of the bag. The top seal has diagonal adhesive seals on each side which are constructed and arranged to provide free-standing, outwardly projecting triangular corner flaps with sealed edges on each side. Their diagonal edges intersect at two spaced apart points near the center of the bag. The points at the intersecting ends of the four flaps define the steam vent area for the bag. The diagonal seals at the top and bottom ends intersect the bag face containing the susceptor at four points A-D to define a rectangular area that remains relatively flat while the corn is popped in the microwave oven. When the bag is in a flat condition, the gussets extend toward one another, almost to the center of the bag. The centermost folds of the gussets are therefore close enough together to the divide the bag into two parallel chambers: a lower chamber between the lower panel of the bag and the gussets, and an upper chamber between the gussets and the upper panel of the bag. The upper chamber is held shut with tack seals while the lower chamber is opened to receive the popcorn and shortening when the package is filled. |
