JP2006143237A - Packaging bag for microwave oven - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag for a microwave oven capable of releasing steam by automatically making an opening at a predetermined position as the internal pressure is increased caused by generation of the steam when the bag is placed in the microwave oven to heat contents thereof so that any opening for releasing the steam does not substantially remain in the unsealed bag after being heated by the microwave oven. <P>SOLUTION: In the packaging bag for the microwave oven, an unsealing notch 10 is formed close to an upper edge of a side edge seal part 5, a projecting seal part 11 projecting inwardly from an inner edge of the side edge seal part 5 is formed corresponding to the position of the notch 10. An inner end of the notch 10 is located close to the projecting seal part 11, at the position brought in contact with the projecting seal part 11 or within the projecting seal part 11. Easily peelable films 4 are respectively held by the side edge seal part 5 around the notch 10 and the projecting seal part 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is, for example, a packaging bag used for sealed packaging of foods, etc., and when the contents are heated without being opened, the contents are heated automatically as the internal pressure increases due to the generation of steam. The present invention relates to a microwave oven packaging bag that can open a predetermined position and release internal pressure (steam).

  Conventionally, as a packaging bag for a microwave oven, an opening notch is provided near the upper edge of the side edge seal part, while the inner edge of the central part of the side edge seal part is bulged inwardly in a trapezoidal shape, and the bulge seal part The outer edge side of the side edge seal portion corresponding to this bulging seal portion is cut out into a semi-cylindrical or semi-elliptical shape, the seal width in the bulging seal portion is narrowed, and the internal pressure increases due to heating. In addition, there is known one that is capable of releasing steam by breaking and opening the seal of the bulging seal portion that is susceptible to peeling force and having a narrow seal width (for example, see Patent Document 1). .

JP-A-10-101154

  However, in the case of the above conventional packaging bag for a microwave oven, in order to easily receive a peeling force as the internal pressure increases, a bulging seal portion that is peeled and opened is provided at the center portion of the side edge seal portion. Since the notch for opening is provided near the upper edge of the side edge seal portion so that the upper edge portion can be torn and opened, an opening for removing the steam remains in the opened bag. For this reason, if the bulging seal part is turned down when the contents are poured out, the contents are liable to leak out from the opening, which may cause burns on the fingers or stain the surroundings. Since this leakage is likely to occur particularly in the case of contents with a large amount of liquid, the contents that can be applied will be limited if an attempt is made to prevent leakage. Further, there is a problem that the swelled seal portion with a narrow seal width is peeled off, so that steam is easily ejected at once, and the amount of discharged steam is difficult to adjust.

  The present invention has been made in view of the above-described conventional problems, and when a content is heated in a microwave oven, a predetermined position is automatically opened as the internal pressure increases due to the generation of steam. The first object of the microwave oven packaging bag capable of releasing steam is to prevent the opening for removing the vapor from the bag opened after heating by the microwave oven. In addition, a second object of the present invention is to make it easy to adjust the amount of emitted steam.

  For the first purpose of the present invention, in the microwave oven packaging bag having a side edge seal portion, the inner end of the present invention is close to the upper edge of the side edge seal portion, and the inner end is stopped in the side edge seal portion. The microwave oven packaging bag is characterized in that a notch is formed, and a side edge seal portion around the notch is an easily peelable seal portion.

  Also, according to the second aspect of the present invention, for the first purpose, in the microwave oven packaging bag having the side edge seal portion, an opening notch is formed near the upper edge of the side edge seal portion. Corresponding to the position of the notch, a projecting seal portion is formed protruding inward from the inner edge of the side edge seal portion, and the inner end of the notch is in the vicinity of the projecting seal portion, a position in contact with the projecting seal portion, or A microwave oven packaging bag is provided that extends into the protruding seal portion, and the side edge seal portion and the protruding seal portion around the notch are each an easily peelable seal portion.

  In the second aspect of the present invention, in order to easily obtain the peelability of the projecting seal portion, it is preferable that the projecting length is equal to or larger than the end width of the projecting seal portion on the side edge seal portion side. In the first and second aspects of the present invention, for the second purpose, the notch has a first cutout region on the outer end side and a second cutout that is continuous with the inside of the first cutout region. And a second cutout region is formed with a constant width, and at least a part of the first cutout region is formed wider than the second cutout region. In addition, and for other purposes, the notch has a triangular third notch region with the inner end as a vertex connected to the inside of the second notch region, and an easily peelable seal portion. , Formed by fusing with an easy-release film It is intended to include as preferred embodiments thereof that are.

  According to the first aspect of the present invention, the side edge seal portion around the notch is an easily peelable seal portion, and the seal width is narrowed by the notch, so when the internal pressure is increased by heating with a microwave oven, Vapor can be released by opening the notch portion by peeling off the easily peelable seal portion. In addition, since the opening is formed in the notch portion, the bag after the opening substantially does not leave an opening for escape of the vapor, even when the content is a large amount of liquid, The contents do not leak from this opening.

  According to the second aspect of the present invention, the projecting seal portion, which is an easily peelable seal portion, is provided at a position projecting inward that is susceptible to peeling force due to an increase in internal pressure, and this projecting seal portion is used as a starting point. The notch portion can be opened by peeling. For this reason, the notch portion can be reliably opened when the internal pressure increases. Similarly to the first invention, the opened bag does not substantially have an opening for allowing vapor to escape, and even when the content is high in liquid content, The contents do not leak from the opening.

  In the second aspect of the present invention, if the protruding seal portion is formed so that the protruding length is equal to or larger than the end width on the side edge seal portion side, the protruding seal portion can be easily peeled off when the internal pressure increases. Become.

  In the first and second aspects of the present invention, if the notch has a first cutout region that is at least partially wider than the second cutout region, and a second cutout region having a constant width, the peeling is the first. Until it spreads beyond the two notch regions, it can be suppressed to a predetermined amount of vapor ejection from the second notch region 2 having a constant width, and when the internal pressure increases excessively and the peeling proceeds to the first notch region, The wide first cutout region increases the opening and allows excess steam to escape. Further, if the notch is connected to the inside of the second notch region and has a triangular third notch region having the inner end as a vertex, the notch is opened as the protruding seal portion is peeled off. It becomes easy. Furthermore, when the easily peelable seal portion is formed by sandwiching an easily peelable film, manufacture of the packaging bag for microwave oven and adjustment of peelability are facilitated.

  In the present specification, the width of the notch portion refers to an interval in a direction perpendicular to the notch depth direction.

  A microwave packaging bag according to an example of the present invention will be described with reference to FIGS.

  FIG. 1 is an exploded perspective view before sealing the edge of a microwave packaging bag according to an example of the present invention, FIG. 2 is a state in which the edge is sealed from the disassembled state shown in FIG. 3 is an enlarged plan view of the vicinity of the notch and the protruding seal portion before peeling due to internal pressure, FIG. 4 is an enlarged plan view of the vicinity of the notch and the protruding seal portion at the beginning of peeling due to internal pressure, and FIG. FIG. 6 is an enlarged plan view of the vicinity of the notch and the projecting seal portion in a state where the notch is advanced to the inner end of the third notch region of the notch, and FIG. 6 is a notch and a projecting seal portion in which peeling due to the internal pressure has proceeded to the second notch region of the notch FIG. 7 is an enlarged plan view of the vicinity of the notch and the protruding seal portion in a state where the peeling due to the internal pressure has proceeded to the first notch region of the notch.

  The packaging bag for microwave ovens (hereinafter referred to as “packaging bag”) of this example is composed of a front surface portion 1, a back surface portion 2, a bottom surface portion 3, and an easily peelable film 4, as shown in FIG. . The front surface portion 1 and the back surface portion 2 are each composed of a synthetic resin film in which a heat fusion layer is laminated on one surface of the base material layer, and are laminated with the heat fusion layer side facing each other. The bottom surface portion 3 is also made of the same synthetic resin film as the front surface portion 1 and the back surface portion 2, and is folded into a V shape with the heat-fusible layer on the outside, and the top surface portion 1 with the vertex of the V shape facing inward. And is sandwiched between the lower edges of the back surface 2.

  The synthetic resin film constituting the front surface portion 1, the back surface portion 2 and the bottom surface portion 3 is not particularly limited as long as it has a heat fusion layer on one or both surfaces of the base material layer. Polyester, polypropylene, polyamide, and the like can be used. As the heat-fusible layer, for example, polyethylene, polypropylene, ionomer resin, ethylene-vinyl acetate copolymer, and the like can be used. The base material layer may be a single layer film or a laminated film, and can be selected according to the properties of the contents.

  Near the upper edge between the front surface portion 1 and the back surface portion 2, a tape-like easily peelable film 4 is sandwiched across the width direction. Although the easily peelable film 4 in this example is heat-sealed to the back surface portion 2 side in advance, it may be heat-sealed to the front surface portion 1 side in advance.

  As shown in FIG. 2, the front surface portion 1 and the back surface portion 2 are band-shaped with side edge seal portions 5 and 6 with the bottom surface portion 3 and the easily peelable film 4 sandwiched therebetween. It is heat-sealed. Further, the bottom surface portion 3 folded into a V shape is heat-sealed by a bottom edge seal portion 7 whose upper free end side edge portion is curved downwardly concavely with respect to the lower edge portion of the surface portion 1. In addition, the lower edge of the free end is heat-sealed with the bottom edge seal portion 8 whose upper side is curved downwardly concavely with respect to the lower edge portion of the back surface portion 2, and can spread the bottom surface portion 3. A free-standing bag is formed. In addition, 9 is an upper edge seal part formed after filling the contents.

  In FIG. 2, a notch 10 serving as a tear starting point at the time of opening is cut from the outer edge side of a portion of the left side edge seal portion 5 near the upper edge, where the easily peelable film 4 is sandwiched. Further, the side edge seal portion 5 around the notch 10 (hereinafter referred to as “notch periphery seal portion 5 ′”) where the peelable film 4 is interposed is connected to the other surface portion 1 where the easily peelable film 4 is not sandwiched. Peeling compared to the heat-sealed part between the back surface parts 2 (for example, the side edge seal parts 5 and 6 where the easily peelable film 4 is not sandwiched, the bottom edge seal parts 7 and 8 and the upper edge seal part 9) Easy-to-peel seal part.

  As shown in FIG. 3, the notch 10 in this example includes a first cutout region 10a on the outer end side, a second cutout region 10b continuous with the inside of the first cutout region 10a, and a second cutout region. And a third cutout region 10c connected to the inside of 10b. The first cutout region 10a is an arcuate cutout portion whose width gradually decreases toward the second cutout region, and the second cutout region is a cutout portion having a constant width. The third cutout region 10c is a triangular cutout having an inner end as a vertex.

  Corresponding to the position where the notch 10 is formed, a projecting seal portion 11 having a quadrangular shape projecting inward from the inner edge of the side edge seal portion 5 is formed. It extends to a position in contact with the portion 11. However, the notch 10 can be stopped at the inner end in the vicinity of the protruding seal portion 11 or extended into the protruding seal 11.

  The protruding seal portion 11 is a heat-sealed portion between the front surface portion 1 and the back surface portion 2 sandwiching the easily peelable film 4, and the easily peelable film 4 is sandwiched by the sandwiched easily peelable film 4. Compared to the heat fusion part between the other front surface part 1 and the back surface part 2 that is not formed, it is an easily peelable seal part. The protruding seal portion 11 can be formed at the same time as the side edge seal portion 5 is formed. The protruding seal portion 11 can be formed under the same conditions as the side edge seal portion 5, for example, at the same temperature and pressure. However, the pressure and temperature at the time of formation are lower than those of the side edge seal portion 5 to facilitate peeling. You can also. Further, the seal portion 5 ′ around the notch can be made easier to peel off by lowering the pressure and temperature at the time of formation as compared with the other side edge seal portions 5.

  The protruding seal portion 11 can have various shapes as will be described later, but the protruding length compared to the width (maximum width) in order to facilitate peeling by the peeling force applied when the internal pressure of the packaging bag increases. Are preferably equal or larger. Moreover, although the protrusion length of the protrusion seal part 11 changes also with the magnitude | size of a packaging bag, the peelability of the protrusion seal part 11, etc., if it makes it protrude too much, it will be the contents from the upper edge opening part before the upper edge seal part 9 formation. It is preferable that the thickness is about 5 to 15 mm.

  The easily peelable film 4 includes a protruding seal portion 11 sandwiching the easily peelable film 4 due to an increase in internal pressure when the packaging bag after the contents are put and sealed is heated in a microwave oven, and if necessary Then, a part or all of the seal portion 5 ′ around the notch is peeled off and opened through the notch 10 to escape the steam generated inside. The easily peelable film 4 has a certain degree of heat-fusibility to the heat-sealing layer of the front surface portion 1 and the back surface portion 2, and at least the protruding seal portion 11 and the seal portion around the notch when the packaging bag is heated in a microwave oven. What can reduce 5 'seal strength can be used. For example, a single-layer synthetic resin film having a low heat-sealing force with the heat-sealing layer on the front surface portion 1 and / or the back surface portion 2, a laminated synthetic resin film that easily peels between layers, a laminated synthetic resin film having an agglomerated peeling layer, or the like is used. be able to. More specifically, for example, a polymer alloy of polypropylene and polystyrene, a mixed resin of polypropylene and polyethylene, a polypropylene multilayer resin, an ethylene-vinyl acetate copolymer film, and the like can be mentioned. It can be selected according to the material of the fusion layer. In addition, a synthetic resin film having a lower melting point than the heat-sealing layer on the front surface portion 1 and the back surface portion 2 is used as the easily peelable film 4, and the heat-sealing layer on the front surface portion 1 or the back surface portion 2 is softened or melted to cause a sealing force. It is also possible to reduce the sealing force by softening or melting before decreasing.

  The easy-peelable film 3 can be locally provided only on the projecting seal portion 11 and the notch-around seal portion 5 ′ side, but when attached as a long tape, the packaging bag can be easily manufactured. Thus, it is preferable to attach the packaging bag across the width direction. In this case, the peelable film 3 is also sandwiched between the side edge seal portion 6 opposite to the side edge seal portion 5 provided with the notch 10, but the side edge seal portion 6 has a protrusion that promotes peeling. Since the seal part 11 and the notch 10 are not provided, it is possible to prevent the steam from escaping from the side edge seal 6 before the steam escapes through the notch 10 of the side edge seal part 5.

  In this example, the seal part 5 ′ around the notch and the projecting seal part 11 are made as an easily peelable seal part by sandwiching the easily peelable film 4, but the seal part 5 ′ around the notch and the projecting seal part 11 Easily peelable seal part by performing heat fusion by lowering the heat fusion temperature and pressure compared to other heat fusion parts, or by applying heat release after applying a release agent in advance. It can also be. However, as in this example, it is preferable to use the easily peelable film 4 by sandwiching the easily peelable film 4 because the peelability can be easily adjusted.

  When the packaging bag that contains the contents and is sealed is heated in a microwave oven, the front surface portion 1 and the back surface portion 2 bulge outward due to the increase in internal pressure accompanying the generation of steam. This swollen output acts as a peeling force on the projecting seal portion 11 projecting inward, and in the case of the quadrangular projecting seal portion 11, as shown in FIG. Begins. In addition, 12 is a peeling area | region.

  As the internal pressure increases, the separation progresses. When the separation reaches the inner end of the notch 10 as shown in FIG. 5, the release of vapor is started through the notch 10.

  Usually, the peeling of the notch 10 around the third notch region 10c proceeds to peeling around the second notch region 10b, as shown in FIG. 6, and the second notch region 10b formed with a constant width. Thus, the release of the vapor is continued in a state where the release is suppressed to some extent. The second notch region 10b having a constant width suppresses the vapor discharge amount to a predetermined amount until the peeling reaches the first notch region 10a as shown in FIG. The content is heated in a pressurized state by suppressing the released steam by the notch region, and the heating efficiency is improved. When the content is food, an improvement in flavor similar to cooking by a pressure cooker is obtained.

  Usually, the heating is completed up to the peeling around the second notch region 10b. However, when the internal pressure of the packaging bag further increases, the peeling is performed around the wide first notch region 10a as shown in FIG. As a result, the amount of vapor released increases, and the packaging bag can be prevented from rupturing.

  After performing microwave heating while removing steam as described above, the opening is performed through the notch 10 which is also the opening position for removing the steam. Will not remain.

  In this example, the notch 10 and the protruding seal part 11 are provided in the left side edge seal part 5 in FIG. 2, but the notch 10 and the protruding seal part 11 are provided in the same manner on the right side edge seal part, It is also possible to provide the notch 10 and the protruding seal part 11 in both side edge seal parts 5 and 6.

  As described above, the packaging bag of the present example is a self-supporting bag having a bottom surface, which is widely used as a self-supporting retort pouch, for example, but the present invention is not limited to such a self-supporting bag, but also a side edge. If it is a bag which has the seal | sticker part 5 or 6, it can also apply with respect to the bag which does not have a bottom face, such as a four-side seal bag and a three-side seal bag, for example. However, it is preferable that the bag is a self-supporting bag because it can be placed in a microwave oven with the notch 10 serving as a steam release portion facing up.

  As described above, the notch 10 may be any one in which the inner end is stopped near the protruding seal portion 11, extended to a position almost in contact with the protruding seal portion 11, or extended into the protruding seal portion 11. It can be selected according to the peelability of the seal part 11 and the seal part 5 'around the notch.

  Next, another example of the notch will be described with reference to FIGS. 8 to 12 which are enlarged plan views in the vicinity of the notch and the protruding seal portion, showing examples of the second to fifth notches, respectively. 8-12, the same code | symbol as FIGS. 1-7 shows the same member or site | part.

  The notch 10 shown in FIG. 8 is the same as that described in FIG. 3 for the first notch region 10a and the second notch region 10b, but the third notch region 10c is an arcuate notch portion. It has become. Further, in the notch 10 shown in FIG. 9, the third cutout region 10c shown in FIG. 3 is omitted, and the tip of the second cutout region 10b, which is a rectangular cutout portion having a constant width, protrudes from the seal portion. 11 is extended to a position almost in contact with 11.

  As described above, the shape of the inner end side of the notch 10 can be a linear shape or an arc shape substantially parallel to the side edge seal portion 5 in addition to the triangular shape described in FIG. From the viewpoint of ease of tearing, the triangular shape described in FIG. 3 is preferable.

  10 to 12, the second notch region 10 and the third notch region 10c are the same as those described in FIG. 3, but the notch 10 shown in FIG. One cutout region 10a is a rectangular cutout portion that is wider than the second cutout region 10b. Further, in the notch 10 shown in FIG. 11, the first notch region 10a has an isosceles trapezoidal shape in which the second notch region 10b side is the upper base and the lower bottom is wider than the second notch region 10b. In the notch 10 shown in FIG. 12, the first notch region 10a is located on the lower bottom side of the isosceles trapezoidal notch as in FIG. It is a hexagonal cutout part in which rectangular cutouts with a long side are connected.

  As described above, the first cutout region 10a of the notch 10 can be widely selected in a shape having a wider portion than the second cutout region 10b.

  Furthermore, examples of the projecting seal portion will be described based on FIGS. 13 to 17 which are enlarged plan views of the vicinity of the notch and the projecting seal portion, showing examples of the second and third projecting seal portions, respectively. 13 to 17, the same reference numerals as those in FIGS. 1 to 7 denote the same members or parts.

  The protruding seal portion 11 in FIG. 13 protrudes in a kamaboko shape. In this case, since there is no corner portion like the quadrangular protruding seal portion 11 shown in FIG. 3, the peeling start pressure can be set slightly higher. The protruding seal portion 11 in FIG. 14 protrudes in a right triangle shape with the hypotenuse on the upper edge seal portion 9 side. In this case, since the adhesion area of the protruding vertex is narrow and easy to peel off, the peeling start pressure can be set somewhat low. The protruding seal portion 11 in FIG. 15 protrudes in a right triangle shape with the hypotenuse on the bottom edge seal portions 7 and 8 side. In this case, the protruding apex is closer to the upper edge seal 9 that is not easily subjected to the peeling force due to the increase in internal pressure, so that the peeling start pressure can be set slightly higher. The protruding seal portion 11 in FIG. 16 has a shape in which the hypotenuse of the right-angled triangular protruding seal portion 11 shown in FIG. 15 is recessed in an arc shape. In this case, since the hypotenuse portion is recessed, it becomes difficult to receive a peeling force due to an increase in internal pressure, so that the peeling start pressure can be set higher than that of the protruding seal portion 11 in FIG. The protruding seal portion 11 shown in FIG. 17 has a width smaller than the width of the second cutout region 10 b of the notch 10. The adjustment of the peeling start pressure of the protruding seal portion 11 can also be performed by adjusting the width of the protruding seal portion.

  The shape of the inner end side of the notch 10 shown in FIGS. 3, 8, and 9, the shape of the first notch region 10 a shown in FIGS. 3, 10 to 12, and FIGS. 13 to 17 are shown. The shapes of the protruding seal portions 11 can be used in any combination.

  Next, a packaging bag according to another example of the present invention will be described based on FIG.

  FIG. 18 is a plan view showing a state in which the bottom of a packaging bag according to another example of the present invention is slightly expanded. In FIG. 18, the same reference numerals as those in FIGS. 1 to 7 denote the same members or parts.

  As shown in the drawing, the packaging bag of this example is basically the same as the packaging bag shown in FIGS. 1 and 2, except that the inner end of the notch 10 remains in the side edge seal portion 5. And the point which the protrusion seal | sticker part 11 (refer FIG. 2) is not provided differs from the packaging bag shown by FIG.1 and FIG.2. In the case of this example, by providing the notch 10, the seal width between the inner end of the notch 10 and the inner edge of the side edge seal portion 5 is narrow, and the seal portion 5 ′ around the notch has an easily peelable seal. By being a portion, the seal portion 5 ′ around the notch opens as the internal pressure increases, and steam can be discharged through the notch 10 portion.

  In addition, the notch 10 of the shape demonstrated in FIGS. 8-12 is applicable also to the packaging bag of this example.

It is a disassembled perspective view before sealing the edge of the packaging bag for microwave ovens which concerns on an example of this invention. It is a top view of the state which sealed the edge from the decomposition | disassembly state shown by FIG. 1, and expanded the bottom part a little. It is an enlarged plan view of the vicinity of the notch and the protruding seal part before peeling due to internal pressure. It is an enlarged plan view of the vicinity of the notch and the projecting seal part at the initial stage of peeling by internal pressure. FIG. 10 is an enlarged plan view of the vicinity of the notch and the projecting seal portion in a state where the peeling due to the internal pressure has progressed to the inner end of the third notch region of the notch. FIG. 10 is an enlarged plan view of the vicinity of the notch and the protruding seal portion in a state in which the peeling due to the internal pressure has progressed to the second notch region of the notch. FIG. 6 is an enlarged plan view of the vicinity of the notch and the protruding seal portion in a state where peeling due to internal pressure has progressed to the first notch region of the notch. It is an enlarged plan view of the vicinity of the notch and the protruding seal part, showing an example of the second notch. It is an enlarged plan view in the vicinity of the notch and the protruding seal portion, showing an example of a third notch. It is an enlarged plan view of the vicinity of a notch and a protruding seal part, showing an example of a fourth notch. It is an enlarged plan view of the vicinity of the notch and the protruding seal part, showing an example of a fifth notch. It is an enlarged plan view of the vicinity of the notch and the protruding seal part, showing an example of a sixth notch. It is an enlarged plan view of the vicinity of the notch and the protruding seal part, showing an example of the second protruding seal part. It is an enlarged plan view of the vicinity of the notch and the protruding seal part, showing an example of the third protruding seal part. It is an enlarged plan view of the vicinity of the notch and the protruding seal part, showing an example of the fourth protruding seal part. It is an enlarged plan view of the vicinity of the notch and the protruding seal part, showing an example of the fifth protruding seal part. It is an enlarged plan view of the vicinity of the notch and the protruding seal part, showing an example of a sixth protruding seal part. It is a top view of the state which expanded the bottom part of the packaging bag for microwave ovens which concerns on the other example of this invention a little.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front surface part 2 Back surface part 3 Bottom surface part 4 Easy peelable film 5 Side edge seal part 5 'Notch circumference seal part 6 Side edge seal part 7 Bottom edge seal part 8 Bottom edge seal part 9 Upper edge seal part 10 Notch 10a 1st Notch area 10b Second notch area 10c Third notch area 11 Protruding seal part 12 Peeling area

Claims (6)

  In a microwave packaging bag having a side edge seal portion, an opening notch is formed on the side edge seal portion near the upper edge so that the inner end stops inside the side edge seal portion. A packaging bag for a microwave oven, which is an easily peelable sealing portion.   In the microwave oven packaging bag having the side edge seal portion, a notch for opening is formed near the upper edge of the side edge seal portion, and the inner side from the inner edge of the side edge seal portion corresponds to the position of this notch. A projecting seal portion projecting into the notch, and the inner end of the notch extends in the vicinity of the projecting seal portion, to a position in contact with the projecting seal portion or into the projecting seal portion, and the side edge seal portion and the projecting seal around the notch The packaging bag for microwave ovens, wherein each part is an easily peelable seal part.   The packaging bag for a microwave oven according to claim 2, wherein the protruding length is equal to or larger than the end width of the protruding seal portion on the side edge seal portion side.   The notch has a first cutout region on the outer end side and a second cutout region continuous to the inside of the first cutout region, the second cutout region is formed with a constant width, The packaging bag for a microwave oven according to any one of claims 1 to 3, wherein at least a part of the one notch region is formed wider than the second notch region.   5. The microwave oven packaging bag according to claim 4, wherein the notch has a triangular third cutout region having an inner end as a vertex, which is continuous with the inside of the second cutout region.   The packaging bag for a microwave oven according to any one of claims 1 to 5, wherein the easily peelable seal portion is formed by fusion with an easily peelable film interposed therebetween.

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