JP2022185387A - Automatically gas-releasable packaging bag - Google Patents

Abstract

To provide a vertical stand-up, automatically gas-releasable packaging bag allowed to favorably discharge gas with a simpler structure as compared with the conventional one and easy and clear to grasp an opening position for opening with safety.SOLUTION: An automatically gas-releasable packaging bag comprises a side edge-gradually reducing sealed portion 20, in a release-sided side edge 12, that has a heat-seal width W1 decreasing in a direction toward a top opening 15 from a bottom edge 14 side, a to-be-released portion 30 that has a heat seal width W5 narrower than the heat-seal width of the side edge-gradually reducing sealed portion and is heat-sealed with an arcuate protrusion directed toward a central portion of a packaging bag 10, a discharge gas-passing portion 40 that is provided not heat-sealed between film bodies on the back side of the to-be-released portion, and a protruding portion 50, in a release-sided side edge 13, that is provided heat-sealed with a protrusion directed toward a central portion in the vicinity of an opposed position to the to-be-released portion. In the protruding portion, an open-instruction point 51 is formed specifying an open-start point for tearing an upper side of the packaging bag in removing the content.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a vertical automatic ventilating packaging bag that prevents the packaging bag from bursting by automatically exhausting steam generated from the contents when the contents are heated together with the packaging bag.

BACKGROUND ART In recent years, for the purpose of simplifying meal preparation and serving of food, cooked or partially cooked processed foods are widely used and distributed. In particular, the demand is increasing more than before due to the decrease in the number of people per household and the demand for reduction of cooking expenses in restaurants. Such cooked foods are enclosed in containers, packaging bags, etc. made of various resin films for convenience of distribution. Heating of cooked food is roughly classified into hot water bathing in a pot or the like, and final cooking is often performed by a microwave oven (high frequency range). In particular, microwave oven heating is often preferred from the viewpoint of shortening the heating time and simplifying the work. Therefore, resin film containers for food packaging have also been improved in heat resistance and pressure resistance so as to cope with heating in microwave ovens. In the case of heating using a microwave oven, the container expands due to water vapor generated as the contents such as food evaporate. However, the expansion of the container also has limits. When the internal pressure of a container or packaging bag reaches a certain limit, the container (packaging bag) bursts, which is very dangerous. At the same time, it will pollute the inside of the microwave oven.

In the past, the user had to make a hole in the container (packaging bag) before heating in order to prevent it from exploding due to steam, which was troublesome. Further, although there are containers (packaging bags) provided with holes in advance, the airtightness of the containers themselves is not good, and they are mainly limited to packaging of frozen foods and the like. Therefore, in order to improve the airtightness of the container itself and to secure an escape route for water vapor in advance, there has been proposed a packaging bag having an automatic ventilation part in a part of the container or packaging bag. Although the automatic vent is always closed, it is opened first due to the expansion pressure of steam generated from the contents during heating. The filled water vapor is released to the outside of the packaging bag and plays the role of a safety valve that lowers the pressure inside the container.

The present inventor has developed an automatic ventilating packaging bag which has a simpler structure than the conventional ones and is capable of appropriately and safely discharging water vapor (see, for example, Patent Document 1). This automatic air-ventilating packaging bag has, on the side portions, side constant-width sealing portions in which the heat-seal width is constant from the opening side to the bottom side, and heat-sealing from the side constant-width sealing portions to the bottom side. The bottom portion is provided with a gradually tapered bottom seal portion whose heat seal width decreases from both end sides to the center of the bottom portion, and the bottom portion is located at the center of the bottom portion. A heat-sealed portion having a heat-sealed width narrower than the heat-sealed width of the gradually decreasing seal portion protrudes in an arc toward the center of the packaging bag and is heat-sealed. An exhaust air passage is provided in which the film bodies are not heat-sealed.

In the above automatic ventilation packaging bag, the entire bag is expanded by the steam generated from the contents due to the heating of the microwave oven, and the expansion force of this steam is used to concentrate the steam in the planned ventilation part. Destruction occurs and steam is vented. At this time, the exhaust passage part allows the water vapor in the bag to pass through and exhaust it to the outside of the bag when the planned ventilation part is destroyed.

Moreover, in recent years, there is an increasing demand for so-called self-supporting vertical packaging bags in order to reduce labor and improve visibility when displaying products at convenience stores and the like. These vertical packaging bags are placed in a microwave oven in a self-supporting state to be heated. After cooking, the top side of the packaging bag is cut open and the contents are transferred to tableware, or the food is cut as it is and eaten directly from the packaging bag. In particular, in the vertical packaging bag for microwave oven heating, it is necessary to form the ventilation position of steam upwards due to its nature, so there is a risk that fingers may be brought close to the vicinity of the ventilation position when opening. . Therefore, although the unsealing position is clearly indicated, problems such as restrictions on package design have arisen. Therefore, there is a demand for an automatic ventilating packaging bag that has a simple structure that does not require a complicated structure, can be well ventilated, and can easily grasp the opening position. It is

Japanese Patent No. 6561035

The present invention has been made in view of the above-mentioned points, and is a vertical type automatic ventilating packaging bag, which has a simpler structure than the conventional one, and is capable of excellent air evacuation. To provide an automatically ventilated packaging bag that can be easily and clearly grasped and safely opened.

That is, the first invention is a vertically placed type film body having an upper opening formed by heat-sealing both side portions and a bottom portion of a superimposed film body and heat-sealed to form an upper side portion after a content is accommodated. In the packaging bag, one of the side portions, that is, an exhaust side portion, is provided with a side side gradually decreasing seal portion having a heat seal width that decreases from the bottom portion side toward the upper opening, and A heat-sealed portion having a heat-sealed width narrower than the heat-sealed width of the gradually decreasing side seal portion and protruding in an arc toward the center portion of the packaging bag is provided, and the air-permeable portion is heat-sealed at the exhaust side side portion. An exhaust gas passing portion, which is not heat-sealed between the film bodies, is provided on the back side of the planned ventilation portion, and the open side portion, which is the other of the two side portions, is centered in the vicinity of the position facing the planned ventilation portion. A heat-sealed protruding portion protruding toward the part side is provided, and the protruding portion has an opening instruction portion for specifying an opening start position for incising the upper side of the packaging bag when taking out the contents. An automatically ventilating packaging bag characterized by:

A second invention relates to the automatic ventilating packaging bag according to the first invention, comprising a side gradually increasing sealing portion connected to the projecting portion from the bottom portion side of the open side portion and having an increased heat seal width. .

According to a third aspect, in the first or second aspect, the upper side gradually increasing seal is connected to the ventilation planned portion and the projecting portion from the upper opening side to the both side portions and the heat seal width increases. It relates to a self-venting packaging bag with a part.

A fourth invention relates to the automatic ventilation packaging bag according to any one of the first to third inventions, wherein the projecting portion is formed with an uneven portion for indicating the opening instructing portion.

A fifth invention relates to an automatic ventilating packaging bag according to the fourth invention, in which a braille display is formed by the irregularities.

According to the automatic ventilating packaging bag according to the first invention, the upper opening is formed by heat-sealing the both side portions and the bottom portion of the superimposed film body, and is heat-sealed after the content is accommodated to become the upper side portion. In the vertically placed type packaging bag, one of the side portions, that is, the exhaust side portion, is provided with a side side tapering seal portion whose heat seal width decreases from the bottom side toward the upper opening. and a ventilation planned portion having a heat-sealed width narrower than the heat-sealed width of the gradually tapered side side seal portion and protruding in an arc toward the central portion side of the packaging bag and heat-sealed, and the exhaust side. An exhaust gas passing portion, which is not heat-sealed between the film bodies, is provided on the side portion behind the planned ventilation portion, and the open side portion, which is the other of the both side portions, is provided with the planned ventilation portion. A heat-sealed protruding portion protruding toward the central portion is provided in the vicinity of the opposing position, and the opening start position for opening the upper side of the packaging bag when taking out the contents is specified in the protruding portion. Since the opening instructing part is formed, it is possible to perform good exhaust with a simpler structure than the conventional one, and the unsealing position can be easily and clearly grasped, so that the unsealing can be safely performed.

According to the automatic ventilating packaging bag according to the second invention, in the first invention, the opening-side side portion is connected to the projecting portion from the bottom portion side and has a gradually increasing side edge sealing portion with an increasing heat-sealing width. As a result, internal pressure during thermal expansion is easily applied to the planned ventilation portion, and fusion bonding between the films in the planned ventilation portion can be broken efficiently.

According to the automatic ventilating packaging bag according to the third invention, in the first or second invention, the both side portions are connected to the ventilating portion and the projecting portion from the upper opening side, respectively, and the heat seal width is Since the increasing number of upper side edge sealing portions is provided, the content does not accumulate above the intended ventilation portion or the projecting portion, and is less likely to be spilled when the package is opened.

According to the automatic ventilation packaging bag according to the fourth invention, in any one of the first to third inventions, the projecting portion is formed with an uneven portion for indicating the opening instruction portion. Grasping the starting position becomes easier and clearer.

According to the automatic ventilating packaging bag according to the fifth invention, in the fourth invention, since the Braille display is formed by the uneven part, it is easier and clearer for visually impaired people to grasp the opening start position. Become.

1 is a schematic front view of an automatic ventilating packaging bag according to an embodiment of the present invention; FIG. 1 is an overall perspective view of an automatic ventilating packaging bag according to an embodiment of the present invention having an upper side portion; FIG. FIG. 3 is a schematic diagram of the vicinity of the exhaust-side side portion of the automatic ventilating packaging bag. It is a schematic diagram around the opening side side edge part of an automatic ventilation packaging bag. FIG. 3 is a schematic diagram of an automatic ventilating packaging bag formed with an upper gradually increasing seal. FIG. 3 is an expansion conceptual diagram of the automatic ventilation packaging bag.

An automatic ventilating packaging bag 10 according to an embodiment of the present invention shown in FIGS. 1 and 2 is a vertical packaging bag produced by heat-sealing a film body. This automatic ventilation packaging bag 10 is suitably used as a packaging bag for food such as retort food and frozen food. is possible. The packaging bag 10 is retort-sterilized after being filled with contents. Since the automatic ventilating packaging bag 10 of the present invention is a so-called vertical type packaging bag that can stand on its own, the content to be filled is not particularly limited, and it can be used for juicy foods.

As the film body, a film which is a known material for retort packaging is used. The film body can be a polypropylene film, a polyamide film, a polyester film, a biaxially stretched film made of ethylene-vinyl alcohol copolymer, etc., an aluminum oxide vapor deposited biaxially stretched polyester film, a silica vapor deposited biaxially stretched polyester film, or a polymetaxylylene adipate film. Heat-resistant films compatible with microwave ovens (high frequency ovens) such as stretched polyamide films and coextrusion laminated films of these and 6-nylon are exemplified. Usually, the films listed are two layers formed by laminating a sealant film, which is the side that contacts the contents and fuses to each other by heat sealing, and a polyamide resin or polyester resin film that protects the film. Alternatively, it is a laminated film having three or more layers. In the film body, the thickness of each film layer, the number of layers, the resin composition, the characteristics of the content, the heat resistance temperature, the heat sealing temperature, the strength as a packaging bag, the distribution route, the distribution form, etc. are comprehensively considered and selected. . For example, ZK93KM manufactured by Toray Advanced Film Co., Ltd. is used for polypropylene films, and SP-R manufactured by Mitsubishi Plastics, Inc. is used for stretched polymetaxylylene adipamide-based polyamide films.

As shown in FIG. 1, the automatic ventilating packaging bag 10 is heat-sealed at both sides 11 and 11 and at the bottom 14 of the superimposed film bodies, and has an upper opening 15 at the other side (upper side) that is not heat-sealed. have Then, as shown in FIG. 2, after the content is contained (filled), the upper opening 15 is sealed by heat sealing to form an upper side portion 16, thereby forming a vertical packaging bag. In this automatic ventilation packaging bag 10 , one of heat-sealed side portions 11 , 11 is configured as an exhaust side side portion 12 and the other as an opening side side portion 13 .

As shown in FIG. 3 , the exhaust-side side portion 12 includes a side-side gradually decreasing seal portion 20 , a planned ventilation portion 30 , and an exhaust passage portion 40 . The side gradually decreasing seal portion 20 is a portion that is heat-sealed so that the heat-sealed width W1 decreases from the bottom portion 14 side toward the upper opening portion 15 side. Due to the shape in which the heat-sealed width W1 decreases toward the upper opening 15, the side edge gradually decreasing seal portion 20 acts to concentrate the internal pressure upward (particularly toward the ventilating portion 30 described later) during thermal expansion. The angle of inclination of the gradually decreasing side edge seal portion 20 is desirably about 3 to 11 degrees, preferably about 8 degrees.

In addition, on the side of the bottom portion 14 of the gradually decreasing side edge seal portion 20, a constant width side edge seal portion 21 is formed according to the scale of the packaging bag 10 in the vertical direction. The fixed-width side seal portion 21 is a portion that is heat-sealed so that the heat-sealed width W2 between the tapered side-side seal portion 20 and the bottom portion 14 is constant. The heat sealing width W2 of the side edge constant width sealing portion 21 is appropriately determined depending on the contents, but is preferably about 8 to 10 mm. If the heat-sealing width W1 is too narrow, it may become difficult to form the gradually decreasing side edge seal portion 20 . Conversely, if the heat-sealing width is too wide, the fusion-bonding margin becomes large, which impairs the appearance and increases the amount of film used.

As shown in FIGS. 1 to 3, the planned ventilation part 30 is heat-sealed narrower than the heat-sealing width of the side-side gradually decreasing seal part 20 (side-side minimum heat-sealing width W3) from the center of the exhaust-side side part 12 upward. It has a width of W5 and is a heat-sealed portion protruding in an arc toward the center of the packaging bag 10 . In this ventilating portion 30, when the automatic ventilating packaging bag 10 expands due to the steam generated from the contents during cooking, the steam inside the bag is discharged.

As shown in FIG. 3, the planned ventilation part 30 has a flat trapezoidal shape. In the ventilating portion 30, the close contact between the films by heat sealing is first destroyed (ruptured) during thermal expansion, and the water vapor in the bag is exhausted. The planned ventilation part 30 is an intentionally formed fragile part, and has the smallest heat-seal width among any parts of the automatic ventilation packaging bag 10 . Further, the ventilation planned portion 30 is formed such that its maximum protruding position is closer to the central portion of the packaging bag 10 than the maximum width of the side gradually decreasing seal portion 20 (maximum side side heat seal width W5). As a result, the planned ventilation portion 30 is likely to receive the internal pressure at the time of thermal expansion first. That is, the heat-sealed side portions are first subjected to a force tending to separate from each other. Therefore, the close contact between the films of the planned ventilation part 30 is broken efficiently.

As shown in FIG. 3 , the exhaust passage portion 40 is a portion of the exhaust-side side portion 12 that is not heat-sealed behind (outside) the planned ventilation portion 30 . The exhaust passing part 40 allows water vapor in the bag to pass through and exhausts it to the outside of the bag when the planned ventilation part 30 is destroyed. Further, the exhaust gas passing part 40 may be provided with a crimp sealing part 41 for crimping the superimposed film bodies. The compression sealing portion 41 closes the exhaust passage portion 40 before being thermally expanded by sealing the superimposed film bodies without heat-sealing. Therefore, it becomes difficult for foreign matter to enter the exhaust passage portion 40 . In addition, the crimp sealing portion 41 is easily released from crimping when the planned ventilation portion 30 is destroyed by thermal expansion. Therefore, the exhaust passing portion 40 is opened in accordance with the destruction of the planned ventilation portion 30, and the air is efficiently exhausted.

The opening-side side portion 13 includes a projecting portion 50 and an opening instructing portion 51, as shown in FIG. The projecting portion 50 is heat-sealed so as to protrude in an arc toward the central portion in a shape corresponding to the planned ventilation portion 30 and the exhaust passage portion 40 of the exhaust-side side portion 12 . The protruding portion 50 is formed to concentrate the internal pressure at the time of thermal expansion to the opposing exhaust-side side portion 12 side. The projecting portion 50 is formed in the vicinity of the position facing the ventilating portion 30 for good concentration of the internal pressure. If it is formed so as to be shifted downward from the opposing position, internal pressure is likely to be exerted downward on the planned ventilation portion 30, and the planned ventilation portion 30 will be destroyed more quickly. If the projecting portion 50 is formed in a symmetrical position with respect to the planned ventilation portion 30, the appearance is improved.

The opening instructing portion 51 is a portion for specifying an opening start position for cutting the upper side of the packaging bag 10 when taking out the contents by opening. The opening instructing portion 51 is made of suitable easy-to-open means such as a notch or a notch. When opening the packaging bag 10, the top and bottom of the opening instructing portion 51 are pinched and torn with the left and right fingers to cut open the upper portion of the packaging bag 10 and open the upper opening portion 15.例文帳に追加Further, the opening instructing portion 51 is not formed on the exhaust-side side portion 12, but is formed on the projecting portion 50 of the opposing opening-side side portion 13. As shown in FIG. Since steam is discharged from the exhaust passage portion 40 of the exhaust-side side portion 12 by heating, the opening instruction portion 51 is formed on the open-side side portion 13 side to avoid the exhaust passage portion 40 when opening. It is possible to open the packaging bag 10 safely and easily by preventing fingers from being exposed to steam passing through the exhaust passage part 40. - 特許庁

Furthermore, as shown in FIG. 4, it is preferable to form an uneven portion 70 for indicating the opening instructing portion 51 on the projecting portion 50 . The concave-convex portion 70 can be formed by denting or penetrating the superimposed film body with a needle or the like, or by molding with a stamping die such as embossing. By forming the concave-convex portion 70, the position of the opening instructing portion 51 can be easily and clearly grasped. Further, it is more preferable to use the uneven portion 70 as a Braille display portion 80 that displays "cut" or "cut" in Braille. The Braille display 80 allows even a visually handicapped person to easily and clearly grasp the opening start position indicated by the opening instructing unit 51, thus enhancing safety in handling.

Further, a gradually increasing side edge seal portion 22 is formed on the open side edge portion 13 . The side gradually increasing seal portion 22 is a portion heat-sealed so that the heat-sealed width W6 increases from the bottom portion 14 side toward the upper opening portion 15 side so as to be connected to the projecting portion 50 . The side gradually increasing sealing portion 22 has a shape in which the heat sealing width W6 increases so as to be connected to the projecting portion 50, so that the internal pressure during thermal expansion is concentrated toward the opposing exhaust side side portion 12 side. do. The angle of inclination of the gradually increasing side seal portion 22 is desirably about 15 to 21 degrees, preferably about 19 degrees.

In addition, as shown in FIG. 5, on the side of the ventilating portion 30 of both side portions 11 and the upper opening portion 15 side of the projecting portion 50, the upper side portions are connected to each other and the heat seal widths W7 and W8 are increased. The automatic ventilating packaging bag 10A having gradually increasing seal portions 60, 60 can be provided. In the upper side gradually increasing seal portion 60, an inner edge portion 61 extending from the side of the upper opening portion 15 to the planned ventilation portion 30 (protruding portion 50) protruding into the bag is formed in an inclined shape toward the inside of the bag. Therefore, when the packaging bag 10A is placed vertically, the contents do not accumulate above the ventilating portion 30 and the projecting portion 50 and fall into the bag. It can prevent a part of an object from spilling or sticking to fingers.

Next, with reference to FIG. 6, a description will be given of how the automatic ventilation packaging bag 10 of the present invention deforms during thermal expansion. In the automatic ventilation packaging bag 10 of the present invention, the vapor Vp (thick dotted line arrow) generated from the contents in the packaging bag 10 by heating fills the bag and expands the bag. At this time, since the side gradually decreasing seal portion 20 and the side gradually increasing seal portion 22 are formed on both side portions 11 of the packaging bag 10, the pressing amount of the film body differs depending on the heat sealing width. Therefore, the volume of the gradually decreasing side edge seal portion 20 becomes larger than the volume of the gradually increasing side edge seal portion 22 side. Therefore, the expansion on the side of the exhaust-side side portion 12 becomes conspicuous. On the exhaust-side side portion 12 side of the automatic ventilation packaging bag 10, the planned ventilation portion 30 is the portion that enters the innermost side. Therefore, the pressure of water vapor is likely to be applied to the planned ventilation portion 30 . Since the internal pressure at this point due to the generation of steam is lower than the heat seal strength of each portion, the heat seal portion is not destroyed.

Here, the planned ventilating portion 30 is a portion where the heat-sealing width is the narrowest among any portions of the automatic ventilating packaging bag 10 and the heat-sealing strength is intentionally weakened. When the internal pressure concentrated around the planned ventilation portion 30 is increased and exceeds the heat seal strength of the planned ventilation portion 30, the heat sealing (fusion) of the planned ventilation portion 30 is broken, and the planned ventilation portion 30 is opened to exhaust. It communicates with the passing portion 40 . Once the planned ventilation part 30 is opened, the pressure inside the bag is increased and expanded, so that the water vapor is smoothly discharged from the planned ventilation part 30 via the exhaust passage part 40, and immediately. The internal pressure is reduced. Evacuation of water vapor continues until the internal pressure is nearly balanced with the external pressure. By reducing the internal pressure in the packaging bag 10 in this way, the internal pressure does not exceed the heat seal strength of the portion other than the planned ventilation portion 30, so that the heat seal of the portion other than the planned ventilation portion 30 is not destroyed.

In addition, since the projecting portion 50 formed on the opening side portion 13 is heat-sealed so as to project toward the central portion at a position opposite to the planned ventilation portion 30, the increased internal pressure is prevented from reaching the planned ventilation portion 30. It will guide you to the side. As a result, in addition to the internal pressure induction by the side edge gradually decreasing seal portion 20 , the internal pressure is further induced, so that the internal pressure is favorably concentrated around the ventilation planned portion 30 . Therefore, when the automatic ventilation packaging bag 10 of the present invention is cooked, it is possible to smoothly and safely achieve from expansion due to generation of water vapor to exhaustion.

As described above, in the automatic ventilating packaging bag 10 of the present invention, due to the configuration of the side portions 11, the expansion of the side portions 12 on the exhaust side is conspicuous. Water vapor is safely vented.

INDUSTRIAL APPLICABILITY As illustrated and explained above, the automatic ventilating packaging bag of the present invention is a vertically placed packaging bag, and is formed with a gradually tapered side sealing portion, a planned ventilation portion, and an exhaust passage portion on the side portion on the exhaust side. In addition, a projecting portion and an opening instructing portion are formed on the open-side side portion. Therefore, the structure is extremely simple as compared with the conventional one, and the manufacturing is easy, the manufacturing efficiency can be improved, and the manufacturing cost is reduced. In addition, the steam generated during heating and expansion can be efficiently concentrated to the planned ventilation part by the side edge gradually decreasing seal portion on the exhaust side side portion and the projecting portion or side edge gradually increasing seal portion on the open side side portion. can be done. Therefore, water vapor can be appropriately and safely exhausted from the intended ventilation portion.

Furthermore, since the protruding portion is formed with an uneven portion by embossing, the position of the opening instruction portion can be easily grasped, so that the user does not have to put his or her fingers close to the exhaust passage portion when opening the package. It can be opened safely and securely, and the package design is not restricted.

The automatic ventilating packaging bag of the present invention is a vertically placed packaging bag, which has a simpler structure than conventional ones, improves manufacturing efficiency and manufacturing costs, and can appropriately and satisfactorily exhaust water vapor during thermal expansion. In addition, the unsealing start position can be easily grasped. Therefore, it is promising as an alternative to commercially available heat-cookable packaging bags.

10 Automatic ventilation packaging bag 11 Side part 12 Exhaust side side part 13 Open side side part 14 Bottom side part 15 Upper opening part 16 Upper side part 20 Side side gradually decreasing seal part 21 Side constant width seal part 22 Side side gradually increasing seal part 30 Ventilation scheduled portion 40 Exhaust passage portion 41 Crimp sealing portion 50 Protruding portion 51 Opening instruction portion 60 Upper side gradually increasing seal portion 61 Inner edge portion of upper side gradually increasing seal portion 70 Concavo-convex portion 80 Braille display portion W1 Side side gradually decreasing seal portion Heat-sealing width W2 Heat-sealing width of fixed width side side W3 Minimum heat-sealing width of gradually decreasing side side W4 Maximum heat-sealing width of gradually decreasing side side W5 Heat-sealing width of ventilated area W6 Increasing side side seal Heat seal width of W7, W8 Heat seal width of upper side side gradually increasing seal part

Claims (5)

A vertical packaging bag having an upper opening which is formed by heat-sealing both side and bottom sides of superimposed film bodies and which is heat-sealed to become the upper side after the content is accommodated,
The exhaust-side side portion, which is one of the side portions, is provided with a side gradually decreasing seal portion whose heat seal width decreases from the bottom side toward the upper opening. A heat-sealed ventilating portion having a heat-sealed width narrower than the sealing width and protruding in an arc toward the center of the packaging bag is provided, and the exhaust-side side portion is located behind the ventilating portion. is provided with an exhaust passage portion in which the film bodies are not heat-sealed,
The other of the two sides, that is, the open side, is provided with a protruding portion in the vicinity of the position facing the ventilation planned portion, which protrudes toward the central portion and is heat-sealed. An automatic ventilating packaging bag, characterized in that an opening instruction portion is formed to specify an opening start position for opening the upper side of the packaging bag when taking out an object. 2. The automatic ventilating packaging bag according to claim 1, wherein the opening side edge portion is provided with a side edge gradually increasing sealing portion connected to the projecting portion from the bottom portion side and having an increasing heat seal width. 3. The automatic ventilation packaging according to claim 1 or 2, wherein the both side portions are provided with upper side gradually increasing seal portions connected to the ventilating portion and the protruding portion from the upper opening side and having an increasing heat seal width. bag. 4. The automatic ventilation packaging bag according to any one of claims 1 to 3, wherein the projecting portion is formed with an uneven portion for indicating the opening instruction portion. 5. The automatic ventilating packaging bag according to claim 4, wherein the uneven portion forms a Braille display portion.

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