JP2021028235A - Pouch - Google Patents

Abstract

To prevent a content from leaking out when steam is discharged.SOLUTION: A pouch includes: a film that contains at least a sealant layer located on an inner surface of the pouch; an outer edge seal part that joins outer edges of the film along the outer edges of the film and defines a storing part on its inside; a steam vent seal part that is located on the storing part side of the outer edge seal part; and a notch that is at least partially located in the steam vent seal part and penetrates the film. The notch is formed in the film so that it does not reach the outer edge of the film and does not reach an edge of the steam vent seal part.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pouch including a steam venting mechanism.

Conventionally, many cooked or semi-cooked liquids, viscous bodies, or contents in which liquids and solids are mixed and sealed in a pouch composed of a plastic laminate are on the market. In the pouch, the unsealed portion in which the laminated bodies are not joined together constitutes the accommodating portion in which the contents are accommodated. Further, the sealing portion in which the laminated bodies are joined seals the accommodating portion. The contents are, for example, cooked foods such as curry, stew, and soup. The contents are heated in a microwave oven or the like while being housed in a pouch.

By the way, when the contents contained in the sealed pouch are heated by using a microwave oven, the water contained in the contents evaporates with the heating and the pressure in the containing portion increases. If the pressure in the pouch housing increases, the pouch may burst and the contents may scatter and stain the inside of the microwave oven. In consideration of such a problem, for example, Patent Document 1 provides a pouch with a steam venting mechanism that automatically communicates between the accommodating portion and the outside when the pressure of the accommodating portion increases to allow steam in the accommodating portion to escape to the outside. is suggesting. In Patent Document 1, the steam bleeding mechanism includes a steam bleeding notch formed in a peripheral seal portion located on the outer edge of the pouch.

Japanese Unexamined Patent Publication No. 2012-56596

In the pouch described in Patent Document 1, the vapor vent cut is formed in the peripheral edge seal portion so as to extend from the outer edge of the pouch to the front of the inner edge of the peripheral edge seal portion. In this case, when the pouch is heated using a microwave oven, the pouch tears from the outer edge toward the inner edge of the peripheral sealing portion along the steam vent cut. Therefore, it is considered that not only the steam but also the contents are likely to leak from the steam vent notch.

An object of the present invention is to provide a pouch capable of effectively solving such a problem.

The present invention is a pouch having a housing.
A film containing at least a sealant layer located on the inner surface of the pouch, and
An outer edge sealing portion that joins the outer edges of the film along the outer edge of the film, and an outer edge sealing portion that defines the accommodating portion inside the outer edge sealing portion.
It is provided with a steam venting seal portion located closer to the accommodating portion than the outer edge sealing portion, and a notch located at least partially in the steam venting seal portion and penetrating the film.
The notch is a pouch formed in the film so as not to reach the outer edge of the film and not to reach the edge of the vapor vent seal.

In the pouch according to the present invention, the steam vent seal portion may be connected to the outer edge seal portion.

In the pouch according to the present invention, the steam vent seal portion may be separated from the outer edge seal portion.

In the pouch according to the present invention, the notch may be located closer to the accommodating portion than the outer edge sealing portion.

In the pouch according to the present invention, the notch may include a first convex portion that is convex toward the edge of the steam vent seal portion.

In the pouch according to the present invention, the edge portion of the steam vent seal portion includes a first edge portion, a second edge portion extending in a direction different from the first edge portion, and the first edge portion and the second edge portion. A first connecting portion for connecting the above and the first connecting portion may be included.

In the pouch according to the present invention, when a virtual straight line extending from the center point of the accommodating portion to the steam venting seal portion at the shortest distance is drawn in a plan view, the virtual straight line intersects the first connecting portion. May be good.

In the pouch according to the present invention, the notch may include a first convex portion that is convex toward the first connecting portion of the steam vent seal portion.

In the pouch according to the present invention, the outer edge of the pouch includes a first edge, a second edge facing the first edge, and a third edge and a fourth edge extending between the first edge and the second edge. Have,
The steam vent seal portion may be formed at a position closer to the first edge than the second edge.

In the pouch according to the present invention, the steam venting seal portion may be connected to a portion of the outer edge sealing portion extending along the third edge.

In the pouch according to the present invention, the outer edge of the pouch includes a first edge, a second edge facing the first edge, and a third edge and a fourth edge extending between the first edge and the second edge. Have at least,
The film has a front surface film constituting the front surface of the pouch and a back surface film constituting the back surface of the pouch.
The surface film includes a first surface film located on the first edge side and a second surface film located on the second edge side and partially overlapped with the first surface film.
The steam venting seal portion may be formed in a gassho portion in which the first surface film and the second surface film are overlapped.

In the pouch according to the present invention, the outer edge sealing portion is formed on the inner surface of the first surface film and the inner surface of the second surface film along the outer edge of the first surface film and the outer edge of the second surface film in the palm portion. Including the gassho seal part that joins
The steam vent seal portion may be connected to the gassho seal portion.

According to the present invention, it is possible to prevent the contents from leaking when the steam is discharged.

It is a front view which shows the pouch in embodiment of this invention. It is sectional drawing which shows the case where the pouch shown in FIG. 1 is cut along a virtual straight line. It is a front view which shows the steam vent seal part of a pouch enlarged. It is a figure for demonstrating the 1st connection part. It is sectional drawing which shows an example of the layer structure of the laminated body which constitutes a pouch. It is a front view which shows the state when a pouch is heated. It is a figure which shows a mode that a steam vent seal part is peeled off in a 1st connection part, and a housing part communicates with a cut. It is sectional drawing which shows the case where the pouch shown in FIG. 7 is cut along a virtual straight line. It is a figure which shows how the peeling of a steam vent seal part progresses further. It is sectional drawing which shows the case where the pouch shown in FIG. 9 is cut along a virtual straight line. It is a front view which shows one modification of a pouch. It is a front view which shows one modification of a pouch. It is sectional drawing along the line XIII-XIII of the pouch of FIG. It is a front view which shows one modification of a pouch. It is a front view which shows one modification of the steam venting mechanism. It is a front view which shows one modification of the steam venting mechanism. It is a front view which shows one modification of the steam venting mechanism. It is a front view which shows one modification of the steam venting mechanism. It is a front view which shows one modification of the steam venting mechanism. It is a front view which shows one modification of the steam venting mechanism. It is a front view which shows one modification of the steam venting mechanism.

An embodiment of the present invention will be described with reference to FIGS. 1 to 10. In the drawings attached to the present specification, the scale, aspect ratio, etc. are appropriately changed from those of the actual product and exaggerated for the convenience of illustration and comprehension.

In addition, as used in the present specification, the terms such as "parallel", "orthogonal", and "same" and the values of length and angle that specify the shape and geometric conditions and their degrees are strictly used. Without being bound by meaning, we will interpret it including the range in which similar functions can be expected.

Pouch Figure 1 is a front view showing a case viewed pouch 10 of the present embodiment from the front side. In the present embodiment, the pouch 10 is a bottom gusset type pouch configured to be self-supporting. The pouch 10 includes an outer edge including a first edge 11, a second edge 12, a third edge 13 and a fourth edge 14. The first edge 11 and the second edge 12 extend along the first direction D1, and the third edge 13 and the fourth edge 14 form a second direction D2 between the first edge 11 and the second edge 12. Extends along. Further, the first edge 11 and the second edge 12 face each other in the second direction D2, and the third edge 13 and the fourth edge 14 face each other in the first direction D1. The second direction D2 intersects the first direction D1 and is orthogonal in the example shown in FIG.

When the pouch 10 is self-supporting with the gusset portion facing down as shown in FIG. 1, the first edge 11 and the second edge 12 correspond to the upper edge and the lower edge of the pouch 10, respectively, and the third edge 13 and the third edge 13 and The fourth edge 14 corresponds to the first side edge and the second side edge of the pouch 10. Further, the first edge 11 of the pouch 10 is also a portion where an opening for filling the contents is formed.

In addition, in FIG. 1, a pouch 10 in a state in which the contents are not housed is shown. The pouch 10 according to the present embodiment is configured so that it can be suitably used as a pouch for a microwave oven in which the contents are heated by a microwave oven. The contents contained in the pouch 10 are not particularly limited as long as they can be heated by a microwave oven. For example, examples of the contents contained in the pouch 10 include cooked foods such as curry, stew, soup, simmered dishes, and hamburgers.

As shown in FIG. 1, the pouch 10 includes a front surface film 15 constituting the front surface, a back surface film 16 forming the back surface, and an intermediate film 17 located between the front surface film 15 and the back surface film 16. The intermediate film is located on the second edge 12 of the pouch 10. Each of the films 15, 16 and 17 contains at least a sealant layer located on the inner surface of the pouch 10. An accommodating portion 18 for accommodating the contents is defined between the front surface film 15 and the back surface film 16. The intermediate film 17 is arranged between the front surface film 15 and the back surface film 16 in a state of being folded back at the folded-back portion 17f. In FIG. 1, components such as the back surface film 16 that are not visible when the pouch 10 is viewed from the front surface side are represented by dotted lines.

The terms "front surface film", "back surface film", and "intermediate film" described above are merely those in which each film is partitioned according to the positional relationship, and the method of providing the film when manufacturing the pouch 10 is described. It is not limited by the above terms. For example, the pouch 10 may be manufactured by using one film in which the front surface film 15, the back surface film 16 and the intermediate film 17 are continuously provided, or one sheet in which the front surface film 15 and the intermediate film 17 are continuously provided. It may be manufactured by using a film and one back surface film 16 in total of two films, and one front surface film 15 and one back surface film 16 and one intermediate film 17 in total of three films. It may be manufactured using.

The pouch 10 includes a sealing portion that partially joins the inner surfaces of the films 15, 16 and 17. In the plan view of the pouch 10 as shown in FIG. 1, the seal portion is hatched. The method for forming the seal portion is not particularly limited as long as the opposing films can be joined to each other. For example, the inner surface of the film may be melted by heating and the inner surfaces may be welded to each other, that is, the seal portion may be formed by heat sealing. Alternatively, the sealing portion may be formed by adhering the inner surfaces of the films facing each other with an adhesive or the like.

The sealing portion includes at least an outer edge sealing portion for joining the inner surfaces of the films 15, 16 and 17 along the outer edge of the films 15, 16 and 17. In the example shown in FIG. 1, the outer edge sealing portion of the pouch 10 is a second edge sealing portion 12a formed along the second edge 12, and a third edge sealing portion 30 formed along the third edge 13. , And a fourth edge seal portion 35 formed along the fourth edge 14. The second edge sealing portion 12a is connected to the third edge sealing portion 30 and the fourth edge sealing portion 35 in series. The non-sealing portion surrounded by the second edge sealing portion 12a, the third edge sealing portion 30, and the fourth edge sealing portion 35 functions as the accommodating portion 18 for accommodating the contents. That is, the accommodating portion 18 is defined inside the outer edge sealing portion.

The third edge sealing portion 30 and the fourth edge sealing portion 35 join the inner surface of the front surface film 15 and the inner surface of the back surface film 16. On the other hand, the second edge sealing portion 12a joins the inner surface of the front surface film 15 and the inner surface of the intermediate film 17, or the inner surface of the back surface film 16 and the inner surface of the intermediate film 17.

As shown in FIG. 1, the pouch 10 may include a notch 35a formed in the fourth edge sealing portion 35. The notch can serve as a starting point when the film constituting the pouch 10 is torn and the pouch 10 is opened. The notch 35a may be formed in a portion of the fourth edge seal portion 35 that faces the first seal portion 31 described later in the third edge seal portion 30 in the first direction D1. Further, a notch 30a may also be formed in the third edge sealing portion 30. The notch 30a may face the notch 35a of the fourth edge sealing portion 35 in the first direction D1.

Further, the pouch 10 is provided with a steam venting mechanism 45 for releasing steam generated from the contents by heating to the outside. The steam venting mechanism 45 communicates the accommodating portion 18 of the pouch 10 to the outside when the moisture contained in the content 19 evaporates with heating and the pressure of the accommodating portion exceeds a predetermined value to release steam. It is configured.

When the pouch 10 including the steam bleeding mechanism 45 is heated by using a microwave oven or the like, the pressure in the accommodating portion may not increase to the extent that steam is evacuated from the steam bleeding mechanism 45 to the outside. That is, depending on how the pouch 10 is used, the steam bleeding mechanism 45 may have a low probability of exhibiting the function of releasing steam to the outside. Even in this case, by providing the steam bleeding mechanism 45 in the pouch 10, the probability that steam is evacuated from a place other than the steam bleeding mechanism 45 or the pouch 10 bursts can be further reduced.

The steam bleeding mechanism 45 is located in the steam bleeding seal portion 40 located on the accommodating portion 18 side of the outer edge seal portion and at least partially in the steam bleeding seal portion 40, and has a notch penetrating the front surface film 15 and the back surface film 16. 42 and. In the example shown in FIG. 1, the steam vent seal portion 40 is connected to the third edge seal portion 30. Further, the steam vent seal portion 40 is located near the first edge 11 of the pouch 10. “Close to the first edge 11” means that the steam venting seal portion 40 is located closer to the first edge 11 than the center point C of the accommodating portion 18.

The third edge seal portion 30 to which the steam vent seal portion 40, the notch 42, and the steam vent seal portion 40 are connected will be further described.

As shown in FIG. 1, the third edge seal portion 30 has a first seal portion 31, a second seal portion 32, and an intermediate seal portion 33. The intermediate seal portion 33 is defined as a portion of the third edge seal portion 30 that overlaps with the steam vent seal portion 40 in the first direction D1. In the example shown in FIG. 1, the intermediate seal portion 33 can also be defined as a portion to which the steam vent seal portion 40 is connected. The first seal portion 31 extends from the intermediate seal portion 33 toward the first edge 11 of the pouch 10 along the third edge 13. The second seal portion 32 extends from the intermediate seal portion 33 toward the second edge 12 of the pouch 10 along the third edge 13.

FIG. 2 is a cross-sectional view showing a case where the pouch 10 shown in FIG. 1 is viewed along a virtual straight line M. As shown in FIG. 1, the virtual straight line M is a virtual straight line extending from the center point C of the accommodating portion 18 to the steam vent sealing portion 40 in the shortest distance. The shortest distance H1 from the center point C to the steam vent seal portion 40 of the accommodating portion 18 is smaller than the shortest distance H2 from the center point C to the outer edge seal portion such as the third edge seal portion 30. Therefore, when the pouch 10 swells around the center point C of the accommodating portion 18 due to heating, a larger force is likely to be applied to the steam venting seal portion 40 than the outer edge sealing portion such as the third edge sealing portion 30.

When a force is applied to the steam vent seal portion 40, the steam vent seal portion 40 begins to peel off. When the peeling of the steam vent seal portion 40 reaches the notch 42, the steam generated in the accommodating portion 18 is discharged to the outside through the notch 42. In this way, the steam vent seal portion 40 and the notch 42 function as a steam vent mechanism 45 that discharges the steam of the accommodating portion 18 to the outside.

FIG. 3 is an enlarged front view showing the intermediate seal portion 33 and the steam vent seal portion 40 of the third edge seal portion 30 of the pouch 10. In FIG. 3, the dotted line with the reference numeral 33y represents the inner edge of the intermediate seal portion 33 on the accommodating portion 18 side. The inner edge 33y of the intermediate seal portion 33 is a straight line connecting the end of the inner edge 31y of the first seal portion 31 on the intermediate seal portion 33 side and the end of the inner edge 32y of the second seal portion 32 on the intermediate seal portion 33 side. Defined.

The steam vent seal portion 40 includes an edge portion 41 located on the side of the accommodating portion 18. The edge portion 41 includes a first edge portion 411 and a second edge portion 412, and a first connecting portion 416 that connects the first edge portion 411 and the second edge portion 412.

The first edge portion 411 extends from the first connecting portion 416 to the side of the third edge sealing portion 30. In the example shown in FIG. 3, the first edge portion 411 extends from the first connecting portion 416 until it reaches the second sealing portion 32 of the third edge sealing portion 30. The first edge portion 411 may extend linearly as shown in FIG. For example, the first edge portion 411 extends substantially in the first direction D1 toward the third edge seal portion 30. The angle formed by the direction in which the first edge portion 411 extends and the first direction D1 is, for example, 10 ° or less.

As shown in FIG. 3, the second edge portion 412 extends from the first connecting portion 416 so as to be displaced at least partially toward the third edge sealing portion 30 side toward the first edge 11 side of the pouch 10. May be good. In the example shown in FIG. 3, the second edge portion 412 extends from the first connecting portion 416 until it reaches the first sealing portion 31 of the third edge sealing portion 30. The second edge portion 412 may extend linearly as shown in FIG. In the first connecting portion 416, the angle θ1 formed by the direction in which the first edge portion 411 extends and the direction in which the second edge portion 412 extends is, for example, 30 ° or more and less than 90 °. The angle θ1 may be 80 ° or less, 70 ° or less, or 60 ° or less. The angle θ1 may be 90 ° or more, as shown in the modified example described later.

The first connecting portion 416 is defined as a portion in which the extending direction of the edge portion 41 changes. For example, when the first edge portion 411 and the second edge portion 412 extend linearly, the first connecting portion 416 is located between the first edge portion 411 and the second edge portion 412, and the first edge portion 411 Extends in a direction different from the extending direction, and extends in a direction different from the direction in which the second edge 412 extends.

Further, when the first edge portion 411 and the second edge portion 412 are partially curved, the first connecting portion 416 includes an angle change point at which the amount of change in the direction in which the edge portion 41 extends is 30 ° or more. It may be defined as a part. The same applies to other connecting portions such as the second connecting portion described later. Hereinafter, the angle change point will be described with reference to FIG.

FIG. 4 is an enlarged view showing a part of the edge portion 41. Reference numeral P0 represents one point located on the edge 41. In the example shown in FIG. 4, the point P0 is located on the first connecting portion 416. Reference numeral P1 represents a first point displaced from the point P0 by 5 mm along the edge portion 41 toward the side approaching the first seal portion 31. Reference numeral P2 represents a second point displaced toward the side closer to the second seal portion 32 along the edge portion 41 by 5 mm from the point P0. Reference numeral D (P1) represents a direction in which the edge portion 41 extends at the first point P1. Reference numeral D (P2) represents a direction in which the edge portion 41 extends at the second point P2. The symbol θ (P0) represents the angle formed by the direction D (P1) and the direction D (P2). The angle θ (P0) calculated in this way is the amount of change in the angle of the edge 41 at the point P0. Further, the point P0 at which the angle θ (P0) becomes 30 ° or more is referred to as an angle change point. As shown in FIG. 4, the first connecting portion 416 includes the angle change point P0.

In the example shown in FIG. 4, the amount of change in angle is 30 ° or more not only at the point P0 but also at points such as points P0'and P0'' located in the vicinity of the point P0 on the edge 41. Become. In this case, the first connecting portion 416 is defined as a portion of the edge portion 41 including a point where the amount of change in angle is 30 ° or more.

The first connecting portion 416 is located closer to the second seal portion 32. “Close to the second seal portion 32” means that the first connecting portion 416 is located closer to the second seal portion 32 than the midpoint of the steam vent seal portion 40 in the second direction D2.

Preferably, the first connecting portion 416 is arranged so as to intersect the virtual straight line M. In other words, the first connecting portion 416 is arranged so that the distance from the center point C of the accommodating portion 18 to the first connecting portion 416 is smaller than the distance from the center point C of the accommodating portion 18 to the other edge portion 41. Has been done. In this case, the peeling of the edge portion 41 of the steam venting seal portion 40 that occurs when the pouch 10 is heated tends to occur first at the first connecting portion 416.

Next, the notch 42 will be described. The notch 42 is formed in the film so as not to reach the outer edge of the pouch 10 and the outer edge of the film, and not to reach the edge 41 of the vapor vent sealing portion 40. The outer edge of the film is an edge of the film or a portion where the film is folded like the folded portion 17f described above. The outer edge of the pouch 10 is composed of the outer edge of the film, i.e. the edge or fold of the film.

In the present embodiment, as shown in FIG. 3, the notch 42 is located closer to the accommodating portion 18 than the inner edge 33y of the intermediate seal portion 33. In other words, the notch 42 is formed only in the steam vent seal portion 40, and does not extend to the inner edge 33y of the intermediate seal portion 33.

Since the notch 42 does not reach the outer edge of the pouch 10 and the outer edge of the film, the contents leak from the outer edge of the pouch 10 when the steam of the accommodating portion 18 is discharged to the outside through the notch 42. It is possible to suppress the storage.

The notch 42 may include a first convex portion 421 that is convex toward the edge portion 41 of the steam vent seal portion 40. In the example shown in FIG. 3, the first convex portion 421 is arranged so as to be convex toward the first connecting portion 416 of the edge portion 41 of the steam vent seal portion 40.

As shown in FIG. 3, the notch 42 may be arranged so as to intersect the virtual straight line M. In this case, it is preferable that the first convex portion 421 of the notch 42 intersects the virtual straight line M.

Next, the layer structure of the laminate 50 constituting the front surface film 15 and the back surface film 16 will be described. FIG. 5 is a cross-sectional view showing an example of the layer structure of the laminated body 50.

The laminate 50 includes at least a base material layer 51 and a sealant layer 52. In the example shown in FIG. 5, the base material layer 51 constitutes the outer surface 50y of the laminated body 50, and the sealant layer 52 constitutes the inner surface 50x of the laminated body 50. Further, the laminated body 50 may further include an adhesive layer 53 for adhering the base material layer 51 and the sealant layer 52. The thickness of the laminate 50 is, for example, 60 μm or more, more preferably 70 μm or more. The thickness of the laminated body 50 is, for example, 110 μm or less, more preferably 100 μm or less.

As the material constituting the base material layer 51, for example, a polyamide such as polyester or nylon such as polyethylene terephthalate or polybutylene terephthalate, or a plastic such as polyolefin such as high-density polyethylene or polypropylene can be used. The thickness of the base material layer 51 is, for example, 10 μm or more and 30 μm or less.

As the material constituting the sealant layer 52, for example, polyethylene or polypropylene such as ethylene-methacrylic acid copolymer (EMMA), low density polyethylene (LDPE) or linear low density polyethylene (LLDPE) can be used. The thickness of the sealant layer 52 is, for example, 40 μm or more, more preferably 50 μm or more. The thickness of the sealant layer 52 is, for example, 100 μm or less, more preferably 70 μm or less.

The laminate 50 may include layers other than the base material layer 51, the sealant layer 52, and the adhesive layer 53. For example, the laminate 50 may further include an intermediate layer located between the base material layer 51 and the sealant layer 52. As the intermediate layer, an appropriate one can be selected according to the required performance such as water vapor and other gas barrier properties, light shielding properties, and various mechanical strengths.

Next, the layer structure of the intermediate film 17 will be described. The layer structure of the intermediate film 17 is arbitrary as long as it has an inner surface that can be bonded to the inner surface of the front surface film 15 and the inner surface of the back surface film 16. For example, similarly to the front surface film 15 and the back surface film 16, the above-mentioned laminate 50 may be used as the intermediate film 17. Alternatively, a film having an inner surface composed of a sealant layer and having a structure different from that of the laminated body 50 may be used as the intermediate film 17.

Manufacturing Method of Pouch Next, the manufacturing method of the pouch 10 described above will be described. First, the front surface film 15 and the back surface film 16 made of the laminated body 50 are prepared. Further, an intermediate film 17 in a folded state is inserted between the front surface film 15 and the back surface film 16. Subsequently, the inner surfaces of the films are heat-sealed to form sealing portions such as the second edge sealing portion 12a, the third edge sealing portion 30, the fourth edge sealing portion 35, and the steam venting sealing portion 40. Further, the blade is passed through the front surface film 15 and the back surface film 16 at the position of the steam vent seal portion 40 to form a notch 42 in the steam vent seal portion 40. Further, the films bonded to each other by heat sealing are cut into an appropriate shape to obtain the pouch 10 shown in FIG. Subsequently, the pouch 10 is filled with the contents through the opening of the first edge 11. After that, the pouch 10 is heat-sealed along the first edge 11 to form the first edge sealing portion 11a. In this way, as shown in FIG. 6, it is possible to obtain the pouch 10 in which the contents are contained and sealed.

Further, in the present embodiment, as described above, the second edge portion 412 of the edge portion 41 of the steam vent seal portion 40 is at least partially as it goes from the first connecting portion 416 toward the first edge 11 of the pouch 10. It extends so as to be displaced toward the third edge 13 side. In other words, the second edge portion 412 is inclined so as to be displaced toward the second edge portion 12 toward the first connecting portion 416. Therefore, during the step of filling the contents with the first edge 11 facing upward, the second edge portion 412 is transferred from the opening of the first edge 11 to the second edge portion 412 of the steam venting seal portion 40. The reached contents can be guided downward. As a result, it is possible to prevent the contents from remaining on the edge portion 41 of the steam vent seal portion 40.

Method of opening the pouch Next, a method of opening the above-mentioned pouch 10 will be described. First, the pouch 10 is placed inside the microwave oven with the second edge 12 facing down and the pouch 10 standing on its own. Next, the contents are heated using a microwave oven. As a result, the temperature of the contents rises, and along with this, the water contained in the contents evaporates and the pressure of the housing portion 18 increases.

When the pressure of the accommodating portion 18 becomes high, the pouch 10 swells in a circular shape, for example, with the center point C of the accommodating portion 18 as the center, as shown by the alternate long and short dash line with reference numeral 18a in FIG. Therefore, a force is applied to each position of the seal portion in the direction from the center point C toward the seal portion. The force applied to each position of the seal portion increases as the distance from the center point C decreases. Here, in the present embodiment, the steam vent seal portion 40 is located closer to the accommodating portion 18 than the outer edge seal portion such as the third edge seal portion 30. Therefore, the force F applied to the steam vent seal portion 40 is larger than the force applied to the outer edge seal portion such as the third edge seal portion 30. Further, the distance from the center point C to the first connecting portion 416 of the steam vent seal portion 40 is smaller than the distance from the center point C to the other edge portion 41 of the steam vent seal portion 40. Therefore, a larger force is applied to the first connecting portion 416 as compared with other edge portions 41 such as the first edge portion 411 and the second edge portion 412.

The center point C of the accommodating portion 18 is defined as an intermediate point of a line segment connecting the intermediate point Y1 of the inner edge of the first edge sealing portion 11a and the intermediate point Y2 of the inner edge of the second edge sealing portion 12a in a plan view. To. In FIG. 6, reference numeral H3 represents a distance in the second direction D2 from the intermediate point Y1 of the inner edge of the first edge sealing portion 11a to the intermediate point Y2 of the inner edge of the second edge sealing portion 12a. Further, the reference numeral H4 represents the distance in the second direction D2 from the center point C of the accommodating portion 18 to the steam vent sealing portion 40. The distance H4 is, for example, 0.05 × H3 or more and 0.5 × H3 or less. In the pouch 10 before the first edge seal portion 11a is formed, the intermediate point Y1 can be specified as the intermediate point of the inner edge of the portion of the pouch 10 where the first edge seal portion 11a should be formed.

When a force F is applied to the steam vent seal portion 40, the steam vent seal portion 40 is peeled off. Peeling of the steam vent seal portion 40 is likely to occur first in the portion of the first connecting portion 416. FIG. 7 is a plan view showing a state in which the vapor release seal portion 40 is peeled off and reaches the notch 42. Further, FIG. 8 is a cross-sectional view showing a case where the pouch 10 shown in FIG. 7 is cut along the virtual straight line M. When the peeling of the steam vent seal portion 40 reaches the notch 42, the steam V is discharged to the outside through the notch 42.

As shown in FIG. 9, even after the peeling of the steam venting seal portion 40 reaches the notch 42, the peeling of the steam venting seal portion 40 may proceed further. In this case, as shown in FIG. 9, the peeling of the steam vent seal portion 40 proceeds in the portion of the steam vent seal portion 40 located between the notch 42 and the edge portion 41 of the steam vent seal portion 40. Specifically, the peeling of the steam vent seal portion 40 proceeds between the notch 42 and the first edge portion 411 and between the notch 42 and the second edge portion 412.

FIG. 10 is a cross-sectional view showing a case where the pouch 10 shown in FIG. 9 is cut along a virtual straight line M. The surface film 15 at the position of the notch 42 due to the progress of peeling of the vapor venting seal portion 40 between the notch 42 and the first edge portion 411 and between the notch 42 and the second edge portion 412. The distance between the back film 16 and the back surface film 16 tends to increase. As a result, the steam V can be discharged to the outside more smoothly.

Further, according to the present embodiment, the notch 42 is formed so as not to reach the outer edge of the pouch 10. Therefore, when the pouch 10 is heated, it is possible to prevent the pouch 10 from tearing from the outer edge along the notch 42. As a result, it is possible to prevent the contents from leaking to the outside of the pouch 10. Further, since the notch 42 does not reach the outer edge of the pouch 10, it is possible to prevent the pouch 10 from bending starting from the notch 42. Further, it is possible to prevent the user from mistakenly recognizing the notch 42 as a notch which is a starting point when the film is torn and the pouch 10 is opened.

Further, according to the present embodiment, the notch 42 constituting the steam venting mechanism 45 is formed by inserting a blade into the steam venting seal portion 40. In this way, since the blade is inserted into the steam venting seal portion 40 instead of punching out a part of the steam venting seal portion 40, it is possible to suppress the generation of debris due to the forming process of the steam venting mechanism 45. be able to.

It is possible to make various changes to the above-described embodiment. Hereinafter, a modified example will be described with reference to the drawings as necessary. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above-described embodiment will be used for the parts that can be configured in the same manner as in the above-described embodiment. Duplicate description is omitted. Further, when it is clear that the action and effect obtained in the above-described embodiment can be obtained in the modified example, the description thereof may be omitted.

First Modification Example In the above-described embodiment, an example is shown in which the pouch 10 is a gusset type pouch including a front surface film 15, a back surface film 16, and an intermediate film 17. However, the present invention is not limited to this, and as shown in FIG. 11, the pouch 10 may be a so-called flat pouch including the front surface film 15 and the back surface film 16. In this case, the pouch 10 is heated by the microwave oven while the posture of the pouch 10 is maintained so that the steam vent seal portion 40 is located above the center point C of the accommodating portion 18. For example, when the pouch 10 is sold in a paper box (not shown), the box can be used to maintain the pouch 10 in a predetermined posture.

Second Modified Example In this modified example, an example in which the pouch 10 includes a gassho portion located on the surface will be described. FIG. 12 is a front view showing the pouch 10, and FIG. 13 is a cross-sectional view taken along the line XIII-XIII of the pouch 10 of FIG.

In this modification, the surface film 15 includes a first surface film located on the first edge 11 side and a second surface film located on the second edge 12 side. The first surface film 151 and the second surface film 152 are partially overlapped with each other. Specifically, the inner surface of the tip portion of the first surface film 151 on the second edge 12 side and the inner surface of the tip portion of the second surface film 152 on the first edge 11 side are overlapped and joined to each other. In the following description, the portion where the first surface film 151 and the second surface film 152 are overlapped with each other is also referred to as a gassho portion 20. Further, among the end portions of the gassho portion 20, the end portion on the accommodating portion 18 side is also referred to as a base portion 20y, and the end portion located on the opposite side of the base portion 20y is also referred to as a fifth edge 20x. The fifth edge 20x is part of the pouch 10 and the outer edge of the film.

The gassho portion 20 is a gassho that joins the inner surface of the first surface film 151 and the inner surface of the second surface film 152 along the fifth edge 20x of the first surface film 151 and the fifth edge 20x of the second surface film 152. The seal portion 21 is formed. The gassho seal portion 21 extends from the third edge seal portion 30 to the fourth edge seal portion 35.

In this modification, the steam venting seal portion 40 of the steam venting mechanism 45 is connected to the gassho seal portion 21 at the central portion in the first direction D1 as shown in FIG. The edge portion 41 of the steam vent seal portion 40 includes a first edge portion 411 and a second edge portion 412, and a first connecting portion 416 connecting the first edge portion 411 and the second edge portion 412. .. The angle formed by the first edge portion 411 and the second edge portion 412 may be less than 90 ° or more than 90 °, as in the case of the above-described embodiment.

FIG. 13 is a cross-sectional view taken along the line XIII-XIII of the pouch 10 of FIG. In this modification, the notch 42 of the steam venting mechanism 45 does not reach the fifth edge 20x of the pouch 10 and does not reach the edge 41 of the steam venting seal portion 40, so that the first surface film 151 and the second surface film 151 and the second It is formed on the surface film 152. In the example shown in FIG. 12, the notch 42 is located closer to the accommodating portion 18 than the inner edge 21y of the gassho seal portion 21. In other words, the notch 42 is formed only in the steam vent seal portion 40, and does not extend to the inner edge 21y of the gassho seal portion 21.

As in the case of the above-described embodiment, the notch 42 may have a shape that is convex toward the edge 41 of the steam vent seal portion 40. In the example shown in FIG. 12, the notch 42 includes a first convex portion 421 that is convex toward the first connecting portion 416 of the edge portion 41 of the steam vent seal portion 40.

Also in this modified example, when the pressure of the accommodating portion 18 increases, the steam venting seal portion 40 begins to peel off from the first connecting portion 416. When the peeling of the steam vent seal portion 40 reaches the notch 42, the steam of the accommodating portion 18 is discharged to the outside through the notch 42.

Third Modified Example In the above-described embodiment and modified example, an example is shown in which the width W1 of the first seal portion 31 and the width W2 of the second seal portion 32 are the same in the third edge seal portion 30. .. However, the present invention is not limited to this, and as shown in FIG. 14, the width W1 of the first seal portion 31 may be larger than the width W2 of the second seal portion 32. Similar to the third edge seal portion 30, in the fourth edge seal portion 35, the width W3 of the first seal portion 36 may be larger than the width W4 of the second seal portion 37. This makes it possible to prevent the user from feeling excessive heat when the user picks the first seal portion 31 with a finger after heating the pouch 10. The first seal portion 36 is a portion of the fourth edge seal portion 35 that faces the first seal portion 31 in the first direction D1. The second seal portion 37 is a portion of the fourth edge seal portion 35 that faces the second seal portion 32 in the first direction D1.

This makes it possible to prevent the user from feeling excessive heat when the user picks the first seal portion 31 with a finger after heating the pouch 10.

Hereinafter, a modified example of the steam venting mechanism 45 will be described with reference to FIGS. 15 to 21.

Fourth Modified Example As shown in FIG. 15, the edge portion 41 of the steam vent seal portion 40 includes a third edge portion 413 and a third edge portion 413 in addition to the first edge portion 411, the second edge portion 412, and the first connecting portion 416. The second connecting portion 417 may be further included. The third edge portion 413 extends from the first seal portion 31 toward the accommodating portion 18. The second connecting portion 417 connects the second edge portion 412 and the third edge portion 413. As shown in FIG. 15, the third edge portion 413 may extend linearly in the first direction D1. The angle formed by the direction in which the third edge portion 413 extends and the first direction D1 is, for example, 10 ° or less.

The second connecting portion 417 is defined as a portion in which the extending direction of the edge portion 41 changes, similarly to the first connecting portion 416. For example, the second connecting portion 417 is located between the second edge portion 412 and the third edge portion 413, extends in a direction different from the direction in which the second edge portion 412 extends, and the third edge portion 413 extends. It extends in a direction different from the extending direction.

The second connecting portion 417 is located closer to the first seal portion 31. The "closer to the first seal portion 31" means that the second connecting portion 417 is located closer to the first seal portion 31 than the midpoint of the steam vent seal portion 40 in the second direction D2.

As in the case of the above-described embodiment, the notch 42 may include a first convex portion 421 that is convex toward the first connecting portion 416 of the edge portion 41 of the steam vent sealing portion 40.

Fifth Modification Example In the above-described embodiment and each modification, an example in which the first convex portion 421 of the notch 42 includes two straight portions and a connecting portion connecting the two straight portions. Indicated. However, the present invention is not limited to this, and as shown in FIG. 16 or FIG. 17, the first convex portion 421 is a curved portion curved so as to be convex toward the edge 41 of the steam vent seal portion 40. May be good. In the example shown in FIG. 16, the first convex portion 421 has a shape that is convex toward the second edge portion 412 of the edge portion 41 of the steam vent seal portion 40. In the example shown in FIG. 17, the first convex portion 421 has a shape that is convex toward the first edge portion 411 of the edge portion 41 of the steam vent seal portion 40.

Sixth Deformation Example In the above-described embodiment and each modification, the angle θ1 formed by the direction in which the first edge portion 411 of the edge portion 41 of the steam vent seal portion 40 extends and the direction in which the second edge portion 412 extends is An example of less than 90 ° is shown. However, the present invention is not limited to this, and as shown in FIG. 18, the angle formed by the direction in which the first edge portion 411 of the edge portion 41 of the steam vent seal portion 40 extends and the direction in which the second edge portion 412 extends is formed. It may be 90 ° or more, for example 90 °.

Further, as shown in FIG. 18, the notch 42 may include a second convex portion 422 that is convex toward the side opposite to the edge portion 41 of the steam vent seal portion 40. In the example shown in FIG. 18, the notch 42 includes two second convex portions 422 and one first convex portion 421 located between the two second convex portions 422. The first convex portion 421 is convex toward the second edge portion 412 of the edge portion 41.

Sixth Deformation Example In the above-described embodiment and each modification, an example is shown in which the notch 42 includes the first convex portion 421 or the second convex portion 422. However, the present invention is not limited to this, and as shown in FIG. 19, the notch 42 may be composed of one straight line portion. Even in this case, when the peeling of the steam vent seal portion 40 reaches the notch 42, the steam of the accommodating portion 18 can be discharged to the outside through the notch 42.

Further, as shown in FIG. 19, the first edge portion 411 is at least partially displaced toward the first edge 11 side from the second seal portion 32 of the third edge seal portion 30 toward the first connecting portion 416 side. It may be extended as follows. Further, the third edge portion 413 may extend so as to be at least partially displaced toward the second edge 12 side from the first seal portion 31 of the third edge seal portion 30 toward the second connecting portion 417 side. ..

Seventh Deformation Example As shown in FIG. 20, the edge portion 41 of the steam vent seal portion 40 may have a curved shape over the entire area. In this case, the notch 42 formed in the steam vent seal portion 40 may also have a curved shape like the edge portion 41.

Eighth Deformation Example In the above-described embodiment and each modification, an example is shown in which the steam vent seal portion 40 is connected to an outer edge seal portion such as a third edge seal portion 30 or a gassho seal portion 21. However, the present invention is not limited to this, and as shown in FIG. 21, the steam vent seal portion 40 may be separated from the outer edge seal portion. Even in this case, since the steam vent seal portion 40 is located closer to the accommodating portion 18 than the outer edge seal portion, when the pressure of the accommodating portion 18 increases due to heating, the steam vent seal portion 40 has an outer edge seal. It is easy to apply a large force compared to the part. When the peeling of the steam vent seal portion 40 reaches the notch 42, the steam of the accommodating portion 18 can be discharged to the outside through the notch 42.

Although some modifications to the above-described embodiments have been described, it is naturally possible to apply a plurality of modifications in combination as appropriate. For example, the steam venting seal portion 40 and the notch 42 shown in the above-described embodiment and each modification can be appropriately combined.

10 Pouch 11 1st edge 11a 1st edge sealing part 12 2nd edge 12a 2nd edge sealing part 13 3rd edge 14 4th edge 15 Surface film 151 1st surface film 152 2nd surface film 16 Back surface film 17 Intermediate film 18 Accommodating part 20 Gassho part 20x 5th edge 20y Base part 21 Gassho sealing part 30 3rd edge sealing part 31 1st sealing part 32 2nd sealing part 33 Intermediate sealing part 35 4th edge sealing part 36 1st sealing part 37 2nd seal Part 40 Steam vent Seal part 41 Edge part 411 1st edge part 412 2nd edge part 413 3rd edge part 416 1st connection part 417 2nd connection part 42 Notch 421 1st convex part 422 2nd convex part 45 Steam vent Mechanism 50 Laminated body 50x Inner surface 50y Outer surface 51 Base material layer 52 Sealant layer 53 Adhesive layer M Virtual straight line

Claims (12)

A pouch with a containment
A film containing at least a sealant layer located on the inner surface of the pouch, and
An outer edge sealing portion that joins the outer edges of the film along the outer edge of the film, and an outer edge sealing portion that defines the accommodating portion inside the outer edge sealing portion.
It is provided with a steam venting seal portion located closer to the accommodating portion than the outer edge sealing portion, and a notch located at least partially in the steam venting seal portion and penetrating the film.
A pouch formed in the film so that the notch does not reach the outer edge of the film and does not reach the edge of the vapor vent seal. The pouch according to claim 1, wherein the steam vent seal portion is connected to the outer edge seal portion. The pouch according to claim 1, wherein the steam vent seal portion is separated from the outer edge seal portion. The pouch according to any one of claims 1 to 3, wherein the notch is located closer to the accommodating portion than the outer edge sealing portion. The pouch according to any one of claims 1 to 4, wherein the notch includes a first convex portion that is convex toward the edge portion of the steam vent seal portion. The edge portion of the steam vent seal portion is a first edge portion that connects the first edge portion, the second edge portion extending in a direction different from the first edge portion, and the first edge portion and the second edge portion. The pouch according to any one of claims 1 to 5, which includes a connecting portion. The pouch according to claim 6, wherein when a virtual straight line extending from the center point of the accommodating portion to the steam venting seal portion at the shortest distance is drawn, the virtual straight line intersects the first connecting portion. .. The pouch according to claim 7, wherein the notch includes a first convex portion of the steam vent seal portion that is convex toward the first connecting portion. The outer edge of the pouch has a first edge, a second edge facing the first edge, and third and fourth edges extending between the first edge and the second edge.
The pouch according to any one of claims 1 to 8, wherein the steam vent seal portion is formed at a position closer to the first edge than the second edge. The pouch according to claim 9, wherein the steam venting seal portion is connected to a portion of the outer edge sealing portion extending along the third edge. The outer edge of the pouch has at least a first edge, a second edge facing the first edge, and a third and fourth edge extending between the first edge and the second edge.
The film has a front surface film constituting the front surface of the pouch and a back surface film constituting the back surface of the pouch.
The surface film includes a first surface film located on the first edge side and a second surface film located on the second edge side and partially overlapped with the first surface film.
The pouch according to any one of claims 1 to 8, wherein the steam venting seal portion is formed in a gassho portion in which the first surface film and the second surface film are overlapped. The outer edge sealing portion is a gassho sealing portion that joins the inner surface of the first surface film and the inner surface of the second surface film along the outer edge of the first surface film and the outer edge of the second surface film in the gassho portion. Including
The pouch according to claim 11, wherein the steam vent seal portion is connected to the gassho seal portion.