JP2023051548A - pouch - Google Patents

Abstract

To prevent the content from leaking out of a pouch.SOLUTION: A pouch comprises: a first side seal part; a second side seal part which is located in a second side part that is opposed to a first side part of the pouch in a first direction; a first non-seal part which is separated from a storage part by the first side seal part and spreads so as to at least partially reach a first side edge of the first side part of the pouch; and a penetration part which is located on the inner side of a contour of the first non-seal part. The first side seal part comprises: a lower portion which extends along the first side edge toward the lower part of the pouch from the first non-seal part; a first intermediate portion which is located between the storage part and the first non-seal part and is connected to the lower portion; and a second intermediate portion which is located between the first non-seal part and the first side edge and is connected to the lower portion. The penetration part is located above the second intermediate portion.SELECTED DRAWING: Figure 1

Description

The present invention relates to pouches.

Conventionally, many pouches made of plastic laminates filled and sealed with cooked or semi-cooked liquids, viscous substances, or mixtures of liquids and solids have been on the market. In the pouch, the non-sealed portion where the laminated bodies are not joined constitutes the containing portion in which the contents are contained. Moreover, the sealing portion where the stacked bodies are joined together seals the accommodating portion. The contents are, for example, cooked foods such as curries, stews, and soups. The contents are heated in a microwave oven or the like while being accommodated in the pouch.

When the contents contained in the sealed pouch are heated using a microwave oven, the moisture contained in the contents evaporates as the contents are heated, and the pressure in the container increases. If the pressure in the pouch containing portion increases, the pouch may burst, causing the contents to scatter and contaminate the inside of the microwave oven. In consideration of such problems, Patent Document 1, for example, proposes to provide a pouch with a steam release mechanism that automatically communicates the storage portion with the outside when the pressure of the storage portion increases to release the steam in the storage portion to the outside. is suggesting. In Patent Document 1, the steam release mechanism is isolated from the storage portion by the bulging seal portion that bulges inward from the seal portion that extends along the side edge of the pouch, and the bulging seal portion. and a non-sealing portion extending to reach. When the pressure in the accommodating portion increases, the bulging seal portion is peeled off and the accommodating portion and the non-sealed portion are communicated with each other.

JP-A-10-101154

Steam generated in the containing portion is discharged from the side edge of the pouch through the peeling portion of the bulging seal portion. If the configuration of the bulging seal portion and non-seal portion is inappropriate, the contents may leak out of the pouch.

An object of the present invention is to provide a pouch that can effectively solve such problems.

The present invention relates to a pouch in which a container for containing contents is defined between a surface film and a back film,
a first side sealing portion located on a first side of the pouch and joining the inner surface of the front film and the inner surface of the back film;
a second side seal located on a second side of the pouch opposite in a first direction from the first side and defining the receptacle with the first side seal;
a first unsealed portion located near the top of the pouch and separated from the container by the first side seal, the first unsealed portion extending at least partially along a first side edge of the first side of the pouch; a first non-sealing portion that extends to reach the
a penetrating portion positioned inside the contour of the first non-sealed portion and penetrating at least one of the front film and the back film;
The first side sealing portion has a lower portion extending along the first side edge toward the lower portion of the pouch from the first unsealed portion, and between the accommodating portion and the first unsealed portion. a first intermediate portion located between and connected to the lower portion; and a second intermediate portion located between the first non-sealed portion and the first side edge and connected to the lower portion. , has
The penetrating part is a pouch located above the second intermediate part.

In the pouch according to the present invention, the first intermediate portion may include a first portion, a second portion, and a first connecting portion connecting the first portion and the second portion,
the first portion may extend from the first connecting portion toward the first side of the pouch;
the second portion may extend from the first connecting portion toward the top of the pouch;
The second portion comprises a lower second portion, an upper second portion positioned above the lower second portion, and a transition positioned between the lower second portion and the upper second portion. may include parts and
The transition portion may include an inner edge extending in a different direction than the inner edge of the lower second portion or an outer edge extending in a different direction than the outer edge of the lower second portion.

In the pouch according to the invention, the upper second portion may have a greater width than the lower second portion.

In the pouch according to the present invention, the first intermediate portion may include a first portion, a second portion, and a first connecting portion connecting the first portion and the second portion,
the first portion may extend from the first connecting portion toward the first side of the pouch;
the second portion may extend from the first connecting portion toward the top of the pouch;
The second portion may include a lower second portion and an upper second portion located above the lower second portion and having a width greater than that of the lower second portion.

In the pouch according to the present invention, the through portion may be positioned above the lower second portion.

In the pouch according to the present invention, the upper second portion may be positioned above the second intermediate portion.

In the pouch according to the present invention, the penetration portion may be located closer to the first side than the first portion of the first intermediate portion.

The pouch according to the present invention may be provided with an upper sealing portion located at the upper portion of the pouch and joining the inner surface of the front film and the inner surface of the back film,
The first intermediate portion may be connected to the upper seal portion.

In the pouch according to the invention, the first side seal may have an upper portion extending along the first side edge from the first unsealed portion toward the top of the pouch,
The first intermediate portion may be connected to the upper portion of the first side seal.

In the pouch according to the present invention, the through portion may be located above an intermediate position of the first non-seal portion in a second direction perpendicular to the first direction.

In the pouch according to the present invention, a maximum distance (L15) in the first direction between the first side edge and the inner edge of the first intermediate portion may be 24 mm or less.

In the pouch according to the present invention, a ratio of the maximum value (L15) to the dimension of the container in the first direction may be 0.24 or less.

In the pouch according to the present invention, the sealing portion that joins the inner surface of the front film and the inner surface of the back film may have a hot seal strength of 10 N or less,
The hot seal strength may be the seal strength measured in a 100° C. environment after holding the test piece including the sealed portion in a 100° C. environment for 1 minute.

In the pouch according to the present invention, the packaging material constituting the surface film and the back film may comprise a first biaxially oriented plastic film, a second biaxially oriented plastic film, and a sealant film in this order. often,
There may be only two biaxially oriented plastic films in the packaging material.

In the pouch according to the present invention, the packaging material has a breaking strength of 33.0 MPa or more in one direction when measured in an environment of 100° C. after holding the packaging material in an environment of 100° C. for 1 minute. good too.

In the pouch according to the present invention, the first biaxially oriented plastic film may be a biaxially oriented polyethylene terephthalate film,
The second biaxially oriented plastic film may be a biaxially oriented polyethylene terephthalate film or a biaxially oriented nylon film.

In the pouch according to the present invention, the packaging material may further comprise a transparent deposition layer positioned between the first biaxially oriented plastic film and the second biaxially oriented plastic film,
The transparent deposited layer may contain a metal oxide or an inorganic oxide.

In the pouch according to the present invention, the packaging material constituting the surface film and the back film may comprise a biaxially oriented plastic film and a sealant film in this order,
There may be only one biaxially oriented plastic film in the packaging material.

In the pouch according to the present invention, the packaging material may have a Young's modulus of 3600 MPa or more in one direction.

In the pouch according to the present invention, the packaging material may further comprise a transparent deposition layer provided on the surface of the biaxially oriented plastic film,
The transparent deposited layer may contain a metal oxide or an inorganic oxide.

In the pouch according to the present invention, the packaging material may further include a transparent gas barrier coating film located on the surface of the transparent deposition layer.

In the pouch according to the present invention, the sealant film may contain a propylene/ethylene block copolymer and an elastomer.

In the pouch according to the present invention, the content containing meat may be accommodated in the accommodating portion of the pouch,
The pouch may be heated in a microwave oven.

In the pouch according to the invention, the contents may contain 50 or more pieces of meat having a dimension of 3 mm or more.

In the pouch according to the present invention, a value obtained by dividing the number of meat pieces having a dimension of 3 mm or more by the weight of the content may be 0.3 pieces/g or more.

In the pouch according to the present invention, the content may comprise an ingredient containing the meat and a viscous component,
The ratio of the weight of the ingredients to the weight of the contents may be 8% or more,
A ratio of the weight of the meat to the weight of the ingredients may be 20% or more.

In the pouch according to the present invention, the distance between the upper surface of the contents and the first intermediate portion of the first side seal portion is 5 mm or more and 30 mm or less when the pouch is tilted at 17° with respect to the horizontal plane. may

ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the content leaks out of a pouch.

It is a front view which shows the pouch in 1st Embodiment. FIG. 2 is a cross-sectional view showing an example of the pouch shown in FIG. 1 when viewed along line AA. FIG. 2 is a cross-sectional view showing an example of the pouch shown in FIG. 1 when viewed along line AA. FIG. 4 is a front view showing a pouch containing contents. FIG. 4 is a cross-sectional view showing an example of the state of the pouch when heated in a microwave oven; It is a front view which expands and shows a vapor release mechanism. It is a figure explaining a 1st reference line. It is a figure explaining a 2nd reference line. It is a figure explaining the dimension of the component of a vapor release mechanism. It is a front view which expands and shows a 2nd side part sealing part and a 2nd non-sealing part. FIG. 2 is a cross-sectional view showing an example of the layer structure of the packaging material that constitutes the pouch. FIG. 2 is a cross-sectional view showing an example of the layer structure of the packaging material that constitutes the pouch. FIG. 2 is a cross-sectional view showing an example of the layer structure of the packaging material that constitutes the pouch. FIG. 2 is a cross-sectional view showing an example of the layer structure of the packaging material that constitutes the pouch. It is a figure which shows an example of the method of preparing a test piece. It is a figure for demonstrating the measuring method of hot breaking strength. It is a figure which shows an example of the method of preparing a test piece. It is a figure for demonstrating the measuring method of hot seal strength. It is a figure for demonstrating the measuring method of hot seal strength. It is a figure for demonstrating the measuring method of hot seal strength. FIG. 4 is a plan view showing an example of a loop stiffness measuring device; FIG. 19 is a cross-sectional view of the loop stiffness measurement device of FIG. 18 along line C-C; FIG. 4 is a diagram for explaining a process of attaching a test piece to the loop stiffness measuring instrument; It is a figure for demonstrating the process of forming a loop part in a test piece. It is a figure for demonstrating the process of applying a load to the loop part of a test piece. It is a figure for demonstrating the process of applying a load to the loop part of a test piece. It is a figure which shows a mode that the 1st intermediate part of a 1st side seal|sticker part peels, and a accommodating part communicates with a 1st unsealed part. It is a front view which shows the example of a changed completely type of a vapor release mechanism. It is a front view which shows the example of a changed completely type of a vapor release mechanism. It is a front view which shows the example of a changed completely type of a vapor release mechanism. It is a front view which shows the example of a changed completely type of a vapor release mechanism. It is a front view which shows the steam vent mechanism in 2nd Embodiment. It is a front view which shows the example of a changed completely type of a vapor release mechanism. It is a front view showing a steam venting mechanism in a third embodiment. It is a front view which shows the pouch in 4th Embodiment. FIG. 3 is a diagram showing evaluation results of packaging materials 1 to 3 of Examples. It is a figure which shows the evaluation result of the packaging material 4 of an Example. It is a figure which shows the analysis result of the content 1 of an Example. It is a figure which shows the analysis result of the content 1 of an Example. FIG. 4 is a diagram showing evaluation results of pouches of Examples and Comparative Examples. 4 is a diagram showing a peeled portion of the pouch of Example 1. FIG. FIG. 10 is a diagram showing a peeled portion of the pouch of Example 2; FIG. 10 is a diagram showing a peeled portion of the pouch of Example 3; FIG. 10 is a diagram showing a peeled portion of the pouch of Example 4; FIG. 10 is a diagram showing a peeled portion of the pouch of Example 5; 3 is a diagram showing a peeled portion of the pouch of Comparative Example 1. FIG.

First Embodiment An embodiment of the present invention will be described with reference to the drawings. In the drawings attached to this specification, for convenience of illustration and ease of understanding, the scale, the ratio of vertical and horizontal dimensions, etc. are appropriately changed and exaggerated from those of the real thing.

As used herein, terms specifying shapes and geometric conditions as well as degrees thereof, such as "parallel", "perpendicular", "identical", length and angle values, etc., are not bound by strict meaning. are interpreted to include the extent to which similar functions can be expected.

In this specification, when two or more upper limit candidates and two or more lower limit candidates are given for a parameter, the numerical range of the parameter includes any one upper limit candidate and any It may be configured by combining one lower limit value candidate. For example, consider a case where it is described that "parameter B is, for example, greater than or equal to A1 and may be greater than or equal to A2. Parameter B is, for example, less than or equal to A3 and may be less than or equal to A4." In this case, the numerical range of parameter B may be A1 or more and A3 or less, A1 or more and A4 or less, A2 or more and A3 or less, or A2 or more and A4 or less.

Pouch FIG. 1 is a front view showing a pouch 10 according to the present embodiment as seen from the surface side. The pouch 10 has a container 18 for containing the contents. In FIG. 1, the pouch 10 is shown without any contents. The configuration of the pouch 10 will be described below.

As shown in FIG. 1, pouch 10 includes top portion 11, bottom portion 12, first side portion 13 and second side portion 14, and has a generally rectangular profile in front view. Names such as "upper", "lower" and "side" and terms such as "upper" and "lower" defined the lower side as the side that can lie down when the pouch 10 is heated. 2 shows relative positions and directions of the pouch 10 and its constituent elements in the case shown in FIG. When the pouch 10 is provided with a steam release mechanism, which will be described later, the posture of the pouch 10 is adjusted so that the steam release mechanism is positioned upward. The posture of the pouch 10 other than when the pouch 10 is heated is not limited by the names and terms used herein.

The pouch 10 includes a front film 15 forming the front surface and a back film 16 forming the back surface. Each film consists of a packaging material comprising at least one biaxially oriented plastic film and a sealant film.

The terms "surface film" and "back surface film" are merely divisions of each film according to the positional relationship, and the method of providing the films when manufacturing the pouch 10 is not limited by the above-mentioned terms. do not have. For example, the pouch 10 may be manufactured using one film in which the surface film 15 and the back film 16 are continuously arranged, and two films in total, one surface film 15 and one back film 16, may be used. may be manufactured using

The inner surfaces of the surface film 15 and the back surface film 16 are joined together by a sealing portion. In the front view of the pouch 10 such as FIG. 1, the sealing portion is hatched. A space defined by the seal portion, the surface film 15 and the back film 16 can function as a storage portion 18 for storing contents.

The method for forming the seal portion is not particularly limited as long as the films facing each other can be joined. 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, by heat sealing to form the sealed portion. Alternatively, the sealing portion may be formed by bonding the inner surfaces of the films facing each other using an adhesive or the like.

As shown in FIG. 1, the sealing portion of the pouch 10 has a first side sealing portion 30, a second side sealing portion 50 and a top sealing portion 11a. A first side seal 30 is located on the first side 13 of the pouch 10 . A second side seal 50 is located on the second side 14 . The second side portion 14 faces the first side portion 13 in the first direction D1. The upper seal portion 11 a is located on the upper portion 11 . The upper seal portion 11 a is connected to the first side seal portion 30 and the second side seal portion 50 . The non-sealed portion surrounded by the first side seal portion 30, the second side seal portion 50, and the upper seal portion 11a functions as the storage portion 18 that stores the contents.

As shown in FIG. 1, the pouch 10 in a state before being filled with contents (a state in which no contents are stored) has an opening 12b at the lower portion 12 of the pouch 10 . Although not shown, the lower portion 12 may be formed with a lower sealing portion and the upper portion 11 may be formed with an opening.

In addition to the unsealed portion functioning as the container portion 18, the pouch 10 further comprises a first unsealed portion 45 separated from the container portion 18 by the first side seal portion 30, as shown in FIG. The non-sealed portion is a portion where the film exists where the inner surfaces facing each other are not joined. The first unsealed portion 45 is located near the upper portion 11 of the pouch 10 . “Closer to the upper portion 11 ” means that the first non-seal portion 45 is positioned closer to the upper portion 11 than the center point C of the accommodating portion 18 .

As shown in FIG. 1 , first unsealed portion 45 may extend to at least partially reach first side edge 13 x of first side 13 of pouch 10 . In this case, the first non-sealed portion 45 overlaps the first side edge 13x and has an opening edge 46 that opens to the outside. The steam generated in the housing portion 18 and flowed into the first non-sealed portion 45 can be discharged to the outside through the opening edge portion 46 .

The top sealing portion 11 a and the first side sealing portion 30 are configured to define a first non-sealing portion 45 . For example, as shown in FIG. 1, the first side seal 30 has a lower portion 32 and a first intermediate portion 35 . Lower portion 32 extends along first side 13 from first unsealed portion 45 toward lower portion 12 of pouch 10 . The first intermediate portion 35 is positioned between the housing portion 18 and the first non-seal portion 45 . The first intermediate portion 35 may include a first end connected to the upper seal portion 11 a and a second end connected to the lower portion 32 .

FIG. 2 is a cross-sectional view showing an example of the pouch 10 as viewed along line AA of FIG. When the pouch 10 is heated and steam is generated in the accommodating portion 18 to increase the pressure of the accommodating portion 18, the first intermediate portion 35 is partially peeled off and the accommodating portion 18 and the first unsealed portion 45 are communicated. . The steam that has flowed into the first unsealed portion 45 from the housing portion 18 can be discharged to the outside through the opening edge portion 46 . In this manner, the first intermediate portion 35 and the first non-sealed portion 45 function as the steam release mechanism 25 for discharging the steam in the housing portion 18 to the outside.

As shown in FIG. 1, the pouch 10 may further comprise a piercing portion 47 positioned inside the contour of the first non-sealing portion 45 . The penetrating portion 47 penetrates at least one of the surface film 15 and the back film 16 . For example, as shown in FIG. 2 , the penetrating portion 47 may penetrate both the surface film 15 and the back film 16 . The steam generated in the housing portion 18 and flowed into the first non-sealed portion 45 can also be discharged to the outside through the through portion 47 .

The through portion 47 may be a slit formed in the surface film 15 and the back film 16 . The width of the slit is, for example, 0 mm or more and 1.0 mm or less.

FIG. 3 is a cross-sectional view showing another example of the pouch 10 when viewed along line AA of FIG. The penetrating portion 47 penetrates the surface film 15 but does not have to penetrate the back film 16 . In other words, although the front film 15 is formed with the through portions 47 , the back film 16 may not be formed with the through portions 47 .

As shown in FIG. 1, first side seal 30 may include a second intermediate portion 33 . The second intermediate portion 33 is positioned between the first non-sealed portion 45 and the first side edge 13x and connected to the lower portion 32 . The second intermediate portion 33 may face part of the first intermediate portion 35 in the first direction D1. The second intermediate portion 33 may extend from the upper edge of the lower portion 32 toward the upper portion 11 along the first side edge 13x. The second intermediate portion 33 does not have to extend to the upper seal portion 11a. The opening edge 46 may be positioned between the second intermediate portion 33 and the upper seal portion 11a.

An example of arrangement of the second intermediate portion 33 will be described based on the virtual straight line M. FIG. The imaginary straight line M is, as shown in FIG. 1, a straight line connecting the center point C of the accommodating portion 18 and the first non-sealed portion 45 at the shortest distance. The inner edge 33a of the second intermediate portion 33 may intersect the extension of the imaginary straight line M. Thereby, it is possible to prevent the content 19 from leaking from the opening edge portion 46 . An extension line of the imaginary straight line M may intersect the outer edge 33 b of the second intermediate portion 33 or may intersect the opening edge 46 . The “inner edge” is the edge of the seal located on the side closer to the housing portion 18 . The “outer edge” is the edge of the seal portion located farther from the housing portion 18 .

As shown in FIG. 1 , the penetrating portion 47 may be positioned above the second intermediate portion 33 . The distance from the penetrating portion 47 to the upper seal portion 11a may be shorter than the distance from the second intermediate portion 33 to the upper seal portion 11a. As shown in FIG. 1, the penetrating portion 47 may be positioned above the extension line of the imaginary straight line M. As shown in FIG.

As shown in FIG. 1 , a second non-seal portion 65 may be formed between the second side edge 14 x of the second side portion 14 and the second side seal portion 50 . In this case, the second non-sealed portion 65 may widen to reach the second side edge 14x. In other words, the second non-seal portion 65 may have an opening edge portion 66 that overlaps the second side edge 14x and opens to the outside.

The second side seal 50 may have a lower portion 52 and an intermediate portion 55 . Lower portion 52 extends along second side 14 from second unsealed portion 65 toward lower portion 12 of pouch 10 . The intermediate portion 55 is located between the accommodating portion 18 and the second non-seal portion 65 in the first direction D1. The intermediate portion 55 may include a first end connected to the upper seal portion 11 a and a second end connected to the lower portion 52 .

As shown in FIG. 1, the pouch 10 may include an opening means 30a located at the first side seal 30. As shown in FIG. The opening means 30a penetrates the surface film 15 and the back film 16. As shown in FIG. The opening means 30a is a notch, a cut, or the like. The opening means 30a can serve as a starting point for the user to tear the pouch 10 apart. The opening means 30a extends from the first side edge 13x toward the receiving portion 18. As shown in FIG.

As shown in FIG. 1, the opening means 30a may be located in the second intermediate portion 33 of the first side seal 30. As shown in FIG. The opening means 30a overlaps the first non-sealed portion 45 and the first intermediate portion 35 when viewed along the first direction D1. When the user tears the pouch 10, tearing is not hindered by the first intermediate portion 35 if the region of the first intermediate portion 35 overlapping the opening means 30a in the first direction D1 is peeled off.

As shown in FIG. 1, the pouch 10 may include an opening means 50a located at the second side seal 50. As shown in FIG. The opening means 50a penetrates the surface film 15 and the back film 16. As shown in FIG. The opening means 50a is a notch, a cut, or the like. The opening means 50a, like the opening means 30a, can serve as a starting point for the user to tear the pouch 10 apart. The opening means 50a extends from the second side edge 14x toward the receiving portion 18. As shown in FIG. The opening means 50a may be formed in a portion of the second side seal portion 50 facing the second intermediate portion 33 in the first direction D1. For example, opening means 50 a may be formed in lower portion 52 .

FIG. 4 shows the pouch 10 with the content 19 contained therein and the lower portion 12 sealed. After the pouch 10 is filled with contents through the opening 12b of the lower portion 12, the inner surface of the front film 15 and the inner surface of the back film 16 are joined together at the lower portion 12. As shown in FIG. Thereby, the lower seal part 12a is formed and the pouch 10 is sealed.

The center point C described above is defined as the midpoint of a line segment connecting the midpoint Y1 of the inner edge of the upper seal portion 11a and the midpoint Y2 of the inner edge of the lower seal portion 12a in plan view. A dimension H1 of the accommodating portion 18 in the first direction D1 is determined at the position of the center point C. As shown in FIG. A dimension H2 of the accommodation portion 18 in the second direction D2 is determined at the position of the center point C. As shown in FIG. The second direction D2 is a direction orthogonal to the first direction D1.

Reference H3 represents the distance from the center point C to the first intermediate portion 35 in the first direction D1. The distance H3 is the distance from the intersection of the imaginary straight line M and the inner edge 35a of the first intermediate portion 35 to the center point C in the first direction D1. The distance H3 is, for example, 0.35×H1 or more, and may be 0.37×H1 or more. The distance H3 is, for example, 0.48×H1 or less, and may be 0.45×H1 or less.

Reference H4 represents the distance from the center point C to the first intermediate portion 35 in the second direction D2. The distance H4 is the distance from the intersection of the imaginary straight line M and the inner edge 35a of the first intermediate portion 35 to the center point C in the second direction D2. The distance H4 is, for example, 0.10×H2 or more, may be 0.15×H2 or more, or may be 0.20×H2 or more. The distance H4 is, for example, 0.30×H2 or less, and may be 0.27×H2 or less.

Contents 19 contained in pouch 10 are heated by a microwave oven. Contents 19 may include ingredients and liquid components. Ingredients may contain ingredients containing oil such as meat. Examples of the contents 19 are cooked foods such as curry, stew, soup, boiled food, and hamburgers.

The weight of the content 19 contained in the pouch 10 is, for example, 50 g or more, may be 100 g or more, or may be 130 g or more. The weight of the content 19 contained in the pouch 10 is, for example, 250 g or less, may be 220 g or less, or may be 200 g or less.

The ratio of the weight of ingredients to the weight of the entire contents 19 is, for example, 5% or more, may be 8% or more, or may be 10% or more. The ratio of the weight of ingredients to the weight of the entire contents 19 is, for example, 20% or less, may be 15% or less, or may be 13% or less. Ingredients are obtained by removing the liquid component from the contents 19 . For example, ingredients can be obtained by filtering the liquid component in the content 19 using a sieve. The mesh of the strainer is, for example, 0.7 mm.

The ratio of the weight of meat to the weight of ingredients is, for example, 8% or more, may be 10% or more, may be 15% or more, may be 20% or more, or may be 25% or more. There may be. The ratio of the weight of meat to the weight of ingredients is, for example, 50% or less, may be 40% or less, or may be 30% or less.

The weight ratio of the meat to the weight of the entire content 19 is, for example, 1.0% or more, may be 1.5% or more, or may be 2.0% or more. The weight ratio of the meat to the weight of the entire content 19 is, for example, 10.0% or less, may be 6.0% or less, or may be 4.0% or less.

The meat may have the shape of grains. For example, the meat may be minced meat. The dimensions of the meat may be 1 mm or more, 3 mm or more, 5 mm or more. The dimensions of the meat may be 12 mm or less, 10 mm or less, or 7 mm or less. Dimensions are measured in the direction of maximum meat dimension. Meat dimensions can be calculated by observing the meat using a microscope. As a microscope, VHX-6000 manufactured by Keyence can be used. VH-ZST manufactured by Keyence can be used as a microscope lens. The observation magnification is, for example, 20 times.

Meat having a dimension of 3 mm or more and 12 mm or less tends to affect the evacuation performance of the pouch 10 and the like. According to the present embodiment, by forming the through portion 47 in the pouch 10, even if the content 19 contains meat having a dimension of 3 mm or more and 12 mm or less, the steam can be properly delivered to the outside of the pouch 10. can be discharged.

The number of pieces of meat having a dimension of 3 mm or more and 12 mm or less contained in the content 19 is, for example, 30 or more, may be 50 or more, or may be 70 or more. The number of pieces of meat having a dimension of 3 mm or more and 12 mm or less contained in the content 19 is, for example, 200 or less, may be 150 or less, or may be 100 or less.

The value obtained by dividing the number of pieces of meat having a dimension of 3 mm or more and 12 mm or less contained in the contents 19 by the weight of the contents is, for example, 0.2 pieces/g or more, and 0.3 pieces/g or more. It may be 0.4 pieces/g or more. The value obtained by dividing the number of pieces of meat having a dimension of 3 mm or more and 12 mm or less contained in the content 19 by the weight of the content is, for example, 1.5 pieces/g or less, and 1.0 pieces/g or less. It may be 0.7 pieces/g or less.

The liquid component of the content 19 may be a viscous component having viscosity. The viscosity of the viscous component at 95° C. is, for example, 1000 mPa·S or more, may be 1200 mPa·S or more, or may be 1500 mPa·S or more. The viscosity of the viscous component at 95° C. is, for example, 2500 mPa·S or less, may be 2000 mPa·S or less, or may be 1800 mPa·S or less. Such a viscous component is, for example, keema curry roux.

The viscosity of the viscous component at 50° C. is, for example, 500 mPa·S or more, may be 800 mPa·S or more, or may be 1000 mPa·S or more. The viscosity of the viscous component at 50° C. is, for example, 2000 mPa·S or less, may be 1500 mPa·S or less, or may be 1300 mPa·S or less. Such a viscous ingredient is, for example, a common curry roux.

As a viscosity measuring device, a digital viscometer DV-E manufactured by Eiko Seiki Co., Ltd. can be used. The spindle is for example S63 and the number of revolutions is for example 60 rpm.

FIG. 5 is a cross-sectional view showing an example of the state of pouch 10 when heated in a microwave oven. The cross-section of pouch 10 shown in FIG. 5 shows pouch 10 as viewed along BB in FIG.

As shown in FIG. 5 , the pouch 10 may be heated while being tilted at an angle θa with respect to the horizontal plane 120 . Pouch 10 may be tilted so that lower portion 12 is positioned downward. Thereby, it is possible to prevent the top surface 19 a of the content 19 from contacting the first intermediate portion 35 . The angle θa is, for example, 5° or more, may be 10° or more, or may be 15° or more. The angle θa is, for example, 50° or less, may be 40° or less, or may be 30° or less.

Angle θa may be achieved, for example, by utilizing a carton 100 for containing pouches 10 . The carton 100 may include a body portion 101 that accommodates the pouches 10 and a lid 102 connected to the body portion 101 .

For example, the user opens the carton 100 so that the lid 102 is connected to the body portion 101 only at the connecting portion 103 on the back side of the carton 100 . Subsequently, the user rotates the lid 102 toward the rear side of the main body 101 around the connecting portion 103 as an axis. Thereby, as shown in FIG. 5, the lid 102 can be positioned between the horizontal surface 120 and the body portion 101 . Therefore, the upper portion 11 of the pouch 10 can be positioned higher than the lower portion 12 depending on the dimensions of the lid 102 . As a result, the pouch 10 is tilted at an angle θa with respect to the horizontal plane 120 .

In FIG. 5, Lm represents the distance between the upper surface 19a of the content 19 and the first intermediate portion 35. As shown in FIG. The distance Lm when the angle θa is 17° is, for example, 5 mm or more, may be 8 mm or more, or may be 10 mm or more. The distance Lm when the angle θa is 17° is, for example, 30 mm or less, may be 25 mm or less, or may be 20 mm or less. The distance Lm is calculated, for example, by checking the position of the inner edge 35a of the first intermediate portion 35 when the angle θa is 17°, then opening the pouch 10 and checking the position of the upper surface 19a.

The steam release mechanism 25 will be described in detail. FIG. 6 is an enlarged front view of the vapor release mechanism 25. As shown in FIG.

The first intermediate portion 35 includes an inner edge 35a, which is an edge located on the housing portion 18 side, and an outer edge 35b, which is an edge located on the first non-seal portion 45 side. The outer edge 35 b of the first intermediate portion 35 partially defines the outline of the edge of the first non-seal portion 45 .

First intermediate portion 35 may include first portion 36 , second portion 37 and first connecting portion 38 . The first connecting portion 38 connects the first portion 36 and the second portion 37 .

The first connecting portion 38 is positioned closer to the lower portion 32 . “Closer to the lower portion 32” means that the first connecting portion 38 is positioned closer to the lower portion 32 than the intermediate position of the first non-seal portion 45 in the second direction D2.

The first portion 36 extends from the first connecting portion 38 toward the first side portion 13 . For example, the inner edge 35a and outer edge 35b of the first portion 36 extend toward the lower portion 32 substantially in the first direction D1. The angle between the direction in which the inner edge 35a and the outer edge 35b extend and the first direction D1 is, for example, 10° or less. The first portion 36 may be connected to the inner edge 32 a of the lower portion 32 . The outer edge 35 b of the first portion 36 may extend continuously with the upper edge 32 c of the lower portion 32 . For example, an extension line of the outer edge 35b of the first portion 36 may overlap the upper edge 32c of the lower portion 32 .

The second portion 37 extends from the first connecting portion 38 towards the upper portion 11 . For example, the inner edge 35a and the outer edge 35b of the second portion 37 include portions extending toward the upper portion 11 substantially in the second direction D2. The second portion 37 may be connected to the inner edge 11d of the upper seal portion 11a.

θ1 represents the angle formed by the direction in which the inner edge 35a of the second portion 37 extends and the direction in which the inner edge 35a of the first portion 36 extends. The angle θ1 is, for example, 100° or less, may be 95° or less, or may be 90° or less. The angle θ1 is, for example, 70° or more, may be 80° or more, or may be 85° or more.

θ2 represents the angle formed by the direction in which the outer edge 35b of the second portion 37 extends and the direction in which the outer edge 35b of the first portion 36 extends. The angle θ2 is, for example, 100° or less, may be 95° or less, or may be 90° or less. The angle θ2 is, for example, 70° or more, may be 80° or more, or may be 85° or more.

As shown in FIG. 6 , the second portion 37 may include a lower second portion 371 , an upper second portion 372 and a transition portion 373 . The lower second portion 371 may be connected to the first portion 36 via the first connecting portion 38 . The upper second portion 372 is located above the lower second portion 371 . The upper second portion 372 may be connected to the upper seal portion 11a. The transition portion 373 is located between the lower second portion 371 and the upper second portion 372 .

The transition portion 373 includes an outer edge 35b extending in a direction different from the outer edge 35b of the lower second portion 371 and the outer edge 35b of the upper second portion 372 . The outer edge 35b of the transition portion 373 extends upward to be displaced toward the first side portion 13 in the first direction D1. On the other hand, the inner edge 35a of the transition portion 373 extends along the second direction D2. The width of the transition portion 373 increases upwards. Therefore, the width of the upper second portion 372 is larger than the width of the lower second portion 371 .

As will be shown later, the transition portion 373 may include an inner edge 35a that extends in a different direction than the inner edge 35a of the lower second portion 371 and the inner edge 35a of the upper second portion 372 . In this case, the outer edge 35b of the transition portion 373 may extend along the second direction D2.

Next, the second intermediate portion 33 will be described. As shown in FIG. 6, the second intermediate portion 33 extends from the upper edge 32c of the lower portion 32 toward the upper portion 11 along the first side edge 13x. The second intermediate portion 33 includes an inner edge 33a and an upper edge 33c that contact the first non-sealed portion 45 . The inner edge 33a may face the outer edge 35b of the second portion 37 in the first direction D1. The upper edge 33c may face the inner edge 11d of the upper seal portion 11a in the second direction D2.

Next, the through portion 47 will be described. The outline of the penetrating portion 47 may be fan-shaped such as a semicircle. For example, the slit of the penetrating portion 47 may be an arc. The central angle θ3 of the arc is, for example, 120° or more, may be 150° or more, or may be 180° or more. The dimension of the through portion 47 is, for example, 3 mm or more, may be 4 mm or more, or may be 5 mm or more. The dimension of the through portion 47 is, for example, 20 mm or less, may be 15 mm or less, or may be 10 mm or less. When the penetrating portion 47 is an arc-shaped slit, the dimension of the penetrating portion 47 is the diameter of the circle corresponding to the arc.

Next, the arrangement of the first intermediate portion 35, the second intermediate portion 33 and the penetrating portion 47 will be described.

As shown in FIG. 6 , the penetrating portion 47 may be positioned closer to the first side portion 13 than the first portion 36 of the first intermediate portion 35 . For example, the penetrating portion 47 may be positioned closer to the first side portion 13 than the first reference line SL1. For example, the midpoint of the penetrating portion 47 in the first direction D1 may be positioned above the upper edge 32c of the lower portion 32 . As a result, it is possible to prevent the content 19 jumping upward from reaching the penetration portion 47 through the peeled portion of the first intermediate portion 35 . Therefore, it is possible to prevent the content 19 from leaking from the through portion 47 .

The first reference line SL1 will be described with reference to FIG. The first reference line SL1 is a straight line passing through the first intersection point EP1 and extending in the second direction D2. The first intersection point EP1 is the intersection point between the line EL11 and the line EL12. A line EL11 is an extension of the inner edge 32a of the lower portion 32 . A line EL<b>12 is an extension of the inner edge 35 a of the first portion 36 .

As shown in FIG. 6, the transition portion 373 may be positioned closer to the second side portion 14 than the first reference line SL1. The upper second portion 372 may also be positioned closer to the second side portion 14 than the first reference line SL1.

As shown in FIG. 6 , the upper second portion 372 of the second portion 37 of the first intermediate portion 35 may be positioned above the upper edge 33 c of the second intermediate portion 33 . The transition portion 373 of the second portion 37 of the first intermediate portion 35 may also be positioned above the upper edge 33 c of the second intermediate portion 33 . As a result, the passage of steam from the peeled portion of the first intermediate portion 35 to the penetrating portion 47 and the opening edge portion 46 can be widened.

In FIG. 6, reference character SL2 is a straight line (also referred to as a second reference line) extending in the first direction D1 passing through the intermediate position of the first non-seal portion 45 in the second direction D2. As shown in FIG. 6, the through portion 47 may be positioned above the second reference line SL2. This can prevent the content 19 from leaking from the penetrating portion 47 .

In the example shown in FIG. 6 , the edge of the first non-seal portion 45 in the second direction D2 is defined by the inner edge 11d of the upper seal portion 11a and the upper edge 32c of the lower portion 32. As shown in FIG. In this case, the second reference line SL2 passes through an intermediate position between the inner edge 11d and the upper edge 32c in the second direction D2.

As shown in FIG. 6, the transition portion 373 and the upper second portion 372 of the second portion 37 of the first intermediate portion 35 may be positioned above the second reference line SL2.

As shown in FIG. 6, the second intermediate portion 33 may be positioned below the second reference line SL2.

Next, referring to FIG. 8, the boundary between the lower second portion 371 and the transition portion 373 of the second portion 37 of the first intermediate portion 35 will be described. 8, reference numerals 35b1, 35b2 and 35b3 represent the outer edge of the lower second portion 371, the outer edge of the upper second portion 372 and the outer edge of the transition portion 373, respectively. Symbol SL3 represents a straight line (also referred to as a third reference straight line) that contacts the outer edge 35b3. A symbol θS3 represents an angle (also referred to as a third reference angle) formed by the third reference straight line SL3 and the outer edge 35b1 of the lower second portion 371 . The higher the position of the point of contact of the third reference straight line SL3 with the outer edge 35b3, the larger the third reference angle θS3. A boundary between the lower second portion 371 and the transition portion 373 may be defined as a position where the third reference angle θS3 is 20°.

The penetrating portion 47 may be positioned above the lower second portion 371 . For example, the penetrating portion 47 may be positioned above the boundary between the lower second portion 371 and the transition portion 373 .

In FIG. 8, reference numerals 35a1 and 35a2 represent the inner edge of the lower second portion 371 and the inner edge of the upper second portion 372, respectively. The transition portion 373 may be defined as a portion whose inner edge extends in a different direction with respect to the inner edge 35 a 1 of the lower second portion 371 . For example, although not shown, when a reference straight line similar to the third reference straight line SL3 is drawn so as to be in contact with the inner edge of the transition portion 373, the angle formed by the reference straight line and the inner edge 35a1 of the lower second portion 371 is The 20° position may be defined as the boundary between the lower second portion 371 and the transition portion 373 .

A width W72 of the upper second portion 372 is larger than a width W71 of the lower second portion 371 . The width of first intermediate portion 35, such as width W71 and width W72, is the dimension of first intermediate portion 35 in a direction perpendicular to the direction in which first intermediate portion 35 extends. The width W72 is, for example, 1.2 times or more the width W71, may be 1.5 times or more, or may be 1.8 times or more. The width W72 is, for example, 3.0 times or less the width W71, may be 2.5 times or less, or may be 2.2 times or less.

When the pouch 10 is heated using a microwave oven, the moisture contained in the content 19 evaporates and the pressure in the container 18 increases. When the pressure in the accommodating portion 18 increases, force is applied to the first intermediate portion 35, causing the first intermediate portion 35 to peel off. The peeling of the first intermediate portion 35 occurs starting from the first connecting portion 38 . The peeling of the first portion 36 progresses in the direction from the first connecting portion 38 toward the lower portion 32 . The peeling of the second portion 37 proceeds upward from the first connecting portion 38 .

A lower second portion 371 of the second portion 37 includes an inner edge 35a and an outer edge 35b extending linearly. Also, the lower second portion 371 has a constant width W71. For this reason, it is considered that the peeling of the lower second portion 371 tends to proceed smoothly. "Constant width" means that the difference between the maximum value and the minimum value of the width W71 of the lower second portion 371 is 1 mm or less.
On the other hand, the inner edge 35a or outer edge 35b of the transition portion 373 extends in a direction different from the inner edge 35a or outer edge 35b of the lower second portion 371 . Also, the width W72 of the upper second portion 372 is larger than the width W71 of the lower second portion 371 . For this reason, it is considered that after the peeling of the second portion 37 reaches the transition portion 373 or the upper second portion 372, the peeling progresses less easily. That is, it is considered that the transition portion 373 and the upper second portion 372 function as the peeling suppressing portion 37R that suppresses the progression of peeling of the second portion 37 .

Since the second portion 37 includes the peeling suppressing portion 37R, it becomes easier to imagine the portion where peeling occurs in the second portion 37 . Therefore, the arrangement of the second intermediate portion 33, the penetrating portion 47, and the like can be determined based on the assumed peeled portion.
For example, the penetrating portion 47 may be arranged above the lower second portion 371 . That is, the penetrating portion 47 may be arranged above the lower end of the separation suppressing portion 37R. As a result, it is possible to prevent the content 19 that has been heated and jumped upward from reaching the penetrating portion 47 through the peeled portion of the first intermediate portion 35 .
For example, the upper edge 33c of the second intermediate portion 33 may be arranged above the lower end of the separation suppressing portion 37R. This makes it easier for the steam in the housing portion 18 to reach the opening edge portion 46 through the peeled portion of the first intermediate portion 35 .

Next, with reference to FIG. 9, the dimensions of the constituent elements of the vapor release mechanism 25 will be described.

In FIG. 9, reference L11 represents the dimension of the first non-seal portion 45 in the second direction D2. The dimension L11 is, for example, 20 mm or more, may be 30 mm or more, or may be 35 mm or more. The dimension L11 is, for example, 50 mm or less, may be 45 mm or less, or may be 40 mm or less.

The dimension L11 of the first non-sealed portion 45 may be determined in relation to the dimension H2 of the accommodating portion 18 in the second direction D2. The dimension L11 is, for example, 0.10×H2 or more, may be 0.15×H2 or more, or may be 0.20×H2 or more. The dimension L11 is, for example, 0.35×H2 or less, may be 0.30×H2 or less, or may be 0.27×H2 or less.

In FIG. 9, reference L12 represents the dimension of the opening edge 46 in the second direction D2. The dimension L12 is, for example, 8 mm or more, may be 13 mm or more, or may be 18 mm or more. The dimension L12 is, for example, 35 mm or less, may be 30 mm or less, or may be 25 mm or less.

The dimension L12 of the opening edge portion 46 may be determined in relation to the dimension L11 of the first non-seal portion 45 in the second direction D2. The dimension L12 is, for example, 0.20×L11 or more, may be 0.30×L11 or more, or may be 0.40×L11 or more. The dimension L12 is, for example, 0.80×L11 or less, may be 0.70×L11 or less, or may be 0.60×L11 or less.

In FIG. 9, reference L13 represents the dimension of the second intermediate portion 33 in the second direction D2. The dimension L13 is, for example, 5 mm or more, may be 10 mm or more, or may be 15 mm or more. The dimension L12 is, for example, 30 mm or less, may be 25 mm or less, or may be 20 mm or less.

The dimension L13 of the second intermediate portion 33 may be determined in relation to the dimension L11 of the first non-seal portion 45 in the second direction D2. The dimension L13 is, for example, 0.15×L11 or more, may be 0.25×L11 or more, or may be 0.35×L11 or more. The dimension L13 is, for example, 0.75×L11 or less, may be 0.65×L11 or less, or may be 0.55×L11 or less.

The dimension L13 of the second intermediate portion 33 may be determined in relation to the dimension L12 of the opening edge 46 in the second direction D2. The dimension L13 of the second intermediate portion 33 may be larger or smaller than the dimension L12 of the opening edge 46 . The dimension L13 is, for example, 0.50×L12 or more, may be 0.70×L12 or more, may be 0.90×L12 or more, or may be 1.10×L12 or more. The dimension L13 is, for example, 1.50×L12 or less, may be 1.30×L12 or less, may be 1.10×L12 or less, or may be 0.90×L12 or less.

In FIG. 9, L14 represents the distance in the second direction D2 from the outer edge 35b of the first portion 36 of the first intermediate portion 35 to the through portion 47. In FIG. The distance L14 may be determined in relation to the dimension L11 of the first non-sealed portion 45 in the second direction D2. The distance L14 is, for example, 0.50×L11 or more, may be 0.55×L11 or more, or may be 0.60×L11 or more. The distance L14 is, for example, 0.75×L11 or less, may be 0.70×L11 or less, or may be 0.65×L11 or less.

9, L15 represents the maximum distance in the first direction D1 between the first side edge 13x and the inner edge 35a of the first intermediate portion 35. In FIG. The distance L15 is, for example, 10 mm or longer, may be 15 mm or longer, or may be 20 mm or longer. The distance L15 is, for example, 30 mm or less, may be 27 mm or less, or may be 24 mm or less.

The distance L15 may be determined in relation to the dimension H1 of the accommodating portion 18 in the first direction D1. The distance L15 is, for example, 0.10×H1 or more, may be 0.13×H1 or more, or may be 0.16×H1 or more. The distance L15 is, for example, 0.28×H1 or less, may be 0.26×H1 or less, or may be 0.24×H1 or less.

In FIG. 9, L16 represents the distance from the inner edge 33a of the second intermediate portion 33 to the outer edge 35b of the lower second portion 371 of the second portion 37 in the first direction D1. Reference L17 represents the distance in the first direction D1 from the opening edge 46 to the outer edge 35b of the lower second portion 371 of the second portion 37. As shown in FIG. Reference L18 represents the distance in the first direction D1 from the opening edge 46 to the outer edge 35b of the upper second portion 372 of the second portion 37. As shown in FIG. When the transition portion 373 is positioned above the upper edge 33c of the second intermediate portion 33, the distance L17 is greater than the distances L16 and L18.

The distance L16 is, for example, 6 mm or longer, may be 8 mm or longer, or may be 10 mm or longer. The distance L16 is, for example, 20 mm or less, may be 16 mm or less, or may be 14 mm or less.

9, L19 represents the distance between the transition portion 373 of the first intermediate portion 35 and the second intermediate portion 33. In FIG. The distance L19 is, for example, 8 mm or longer, may be 10 mm or longer, or may be 12 mm or longer. The distance L19 is, for example, 20 mm or less, may be 18 mm or less, or may be 16 mm or less.

In FIG. 9, L20 represents the distance in the second direction D2 between the upper edge 33c of the second intermediate portion 33 and the opening means 30a. The distance L20 is, for example, 2 mm or longer, may be 4 mm or longer, or may be 6 mm or longer. The distance L20 is, for example, 15 mm or less, may be 12 mm or less, or may be 10 mm or less.

In FIG. 9, L21 represents the distance in the second direction D2 from the lower edge of the first non-sealed portion 45 to the transition portion 373 of the second portion 37. In FIG. In the example shown in FIG. 9 , the lower edge of first non-sealed portion 45 includes outer edge 35 b of first portion 36 of first intermediate portion 35 . The distance L21 is, for example, 15 mm or longer, may be 18 mm or longer, or may be 21 mm or longer. The distance L21 is, for example, 30 mm or less, may be 28 mm or less, or may be 26 mm or less.

In FIG. 9, L22 represents the distance in the second direction D2 from the upper edge of the first non-sealed portion 45 to the transition portion 373 of the second portion 37. In FIG. In the example shown in FIG. 9, the upper edge of the first non-seal portion 45 includes the inner edge 11d of the upper seal portion 11a. The distance L22 is, for example, 5 mm or longer, may be 7 mm or longer, or may be 9 mm or longer. The distance L22 is, for example, 15 mm or less, may be 13 mm or less, or may be 11 mm or less.

In FIG. 9, L23 represents the dimension of the transition portion 373 of the second portion 37 of the first intermediate portion 35 in the second direction D2. The dimension L23 is, for example, 1 mm or more, may be 2 mm or more, or may be 3 mm or more. The dimension L23 is, for example, 7 mm or less, may be 6 mm or less, or may be 5 mm or less.

As shown in FIGS. 1 and 9, the lower portion 32 may include a portion with increasing width W12 toward the first intermediate portion 35. As shown in FIGS. For example, a portion of the inner edge 32a of the lower portion 32 may be inclined with respect to the second direction D2 so as to move away from the first side edge 13x as the first intermediate portion 35 is approached. Thereby, the width W12_1 of the lower portion 32 near the first non-seal portion 45 can be made larger than the width W12_2 of the lower portion 32 near the lower portion 12 . The width W12_1 is the distance in the first direction D1 from the first side edge 13x to the first intersection point EP1. The width W12_1 may be the maximum value of the width W12. The width W12_2 is the width of the lower portion 32 at the lower end position of the accommodating portion 18 . The width W12_2 may be the minimum value of the width W12.

By increasing the width W12 of the lower portion 32 toward the first intermediate portion 35 from below, the rigidity of the lower portion 32 in the vicinity of the first non-seal portion 45 can be increased. This can prevent the pouch 10 from bending in the vicinity of the first unsealed portion 45 when the pressure in the accommodating portion 18 increases due to heating. Therefore, it is possible to prevent the passage of steam from being clogged by the bending of the pouch 10 .
Further, by reducing the width W12 of the lower portion 32 in the vicinity of the lower portion 12, the dimension of the opening 12b of the lower portion 12 in the first direction D1 can be increased. Thereby, the content can be more easily filled from the opening 12b.

A ratio of the width W12_1 to the width W12_2 is, for example, 1.1 or more, may be 1.3 or more, or may be 1.5 or more. A ratio of the width W12_1 to the width W12_2 is, for example, 2.5 or less, may be 2.2 or less, or may be 2.0 or less.

In FIG. 9, reference W13 represents the width of the second intermediate portion 33. As shown in FIG. The width W13 of the second intermediate portion 33 is smaller than the width W12 of the lower portion 32 near the first non-seal portion 45 . A ratio of the width W13 to the maximum value of the width W12 is, for example, 0.20 or more, may be 0.30 or more, or may be 0.40 or more. A ratio of the width W13 to the maximum value of the width W12 is, for example, 0.80 or less, may be 0.70 or less, or may be 0.60 or less.

The width W13 of the second intermediate portion 33 may be greater than the width W71 of the lower second portion 371 of the second portion 37 of the first intermediate portion 35 . Accordingly, even if the second intermediate portion 33 is peeled off, it is possible to prevent the peeling from reaching the first side edge 13x.

Next, the intermediate portion 55 and the second non-seal portion 65 of the second side portion 14 will be described in detail. FIG. 10 is an enlarged front view showing the intermediate portion 55 and the second non-seal portion 65. As shown in FIG.

The second non-sealed portion 65 is formed at the same time as the first non-sealed portion 45 by cutting one non-sealed portion, as disclosed in Japanese Unexamined Patent Application Publication No. 2016-74457, for example. For example, when manufacturing a plurality of pouches 10 by cutting the surface film 15 and the back film 16 that are partially joined to each other and extend along the conveying direction along the sealed portion and the non-sealed portion, the cut non-sealed portion One of the portions becomes the first non-sealing portion 45 and the other becomes the second non-sealing portion 65 .

In FIG. 10, symbols W22 and W25 represent the width of the lower portion 52 and the width of the intermediate portion 55, respectively. Width W22 of lower portion 52 may be greater than width W25 of intermediate portion 55 .

Next, the layer structure of the packaging material 70 that constitutes the surface film 15 and the back film 16 will be described. FIG. 11 is a cross-sectional view showing an example of the layer structure of the packaging material 70. As shown in FIG.

The packaging material 70 shown in FIG. 11 comprises a first biaxially oriented plastic film 71, a first adhesive layer 76, a second biaxially oriented plastic film 72, a second adhesive layer 77 and a sealant film 75 in this order. At least prepare. The first biaxially oriented plastic film 71 is positioned on the outer surface 70y side, and the sealant film 75 is positioned on the inner surface 70x side opposite to the outer surface 70y. The inner surface 70x faces the accommodating portion 18 .

Each film comprising the packaging material 70, such as the first biaxially oriented plastic film 71, the second biaxially oriented plastic film 72, the sealant film 75, and the packaging material 70, has a machine direction and a vertical direction. The flow direction is the direction in which the film flows when forming the film, and is the so-called MD (Machine Direction). The vertical direction is a direction perpendicular to the flow direction, and is a so-called TD (Transverse Direction). In the pouch 10 shown in FIG. 1, the first direction D1 is the flow direction and the second direction D2 is the vertical direction.

Each layer of packaging material 70 will now be described in detail.

(First biaxially stretched plastic film)
The first biaxially stretched plastic film 71 is a plastic film that is stretched in two predetermined directions. A biaxially stretched plastic film is a plastic film that has been intentionally stretched in order to improve the mechanical strength of the plastic film. The first biaxially oriented plastic film 71 functions as a base material layer for giving the packaging material 70 a predetermined strength. The stretching direction of the first biaxially stretched plastic film 71 is not particularly limited. For example, the first biaxially stretched plastic film 71 may be stretched in the first direction D1 and the second direction D2. The draw ratio of the first biaxially oriented plastic film 71 is, for example, 1.05 times or more.

The first biaxially stretched plastic film 71 contains polyester as a main component, for example. For example, the first biaxially oriented plastic film 71 contains 51% by mass or more of polyester. Examples of polyester include polyethylene terephthalate (hereinafter also referred to as PET) and polybutylene terephthalate (hereinafter also referred to as PBT). The 51% by mass or more polyester in the first biaxially stretched plastic film 71 may be composed of one type of polyester, or may be composed of two or more types of polyester. The content of polyester in the first biaxially stretched plastic film 71 may be 70% by mass or more, 80% by mass or more, 90% by mass or more, or 95% by mass or more. may be For example, the content of PET in the first biaxially stretched plastic film 71 may be 70% by mass or more, 80% by mass or more, 90% by mass or more, or 95% by mass. % or more.

The thickness of the first biaxially stretched plastic film 71 is, for example, 8 μm or more, may be 9 μm or more, or may be 12 μm or more. The thickness of the first biaxially stretched plastic film 71 is, for example, 30 μm or less, may be 25 μm or less, or may be 20 μm or less. By setting the thickness of the first biaxially stretched plastic film 71 to 8 μm or more, the first biaxially stretched plastic film 71 has sufficient strength. By setting the thickness of the first biaxially stretched plastic film 71 to 30 μm or less, the first biaxially stretched plastic film 71 exhibits excellent moldability. Therefore, the process of processing the packaging material 70 to manufacture the pouch 10 can be carried out efficiently.

(First adhesive layer)
The first adhesive layer 76 contains an adhesive for adhering the first biaxially stretched plastic film 71 and the second biaxially stretched plastic film 72 by a dry lamination method. The adhesive constituting the first adhesive layer 76 is produced from an adhesive composition prepared by mixing a first composition containing a main agent and a solvent and a second composition containing a curing agent and a solvent. Specifically, the adhesive includes a cured product produced by reacting the main agent and solvent in the adhesive composition.

Examples of adhesives include polyurethane and the like. Polyurethane is a cured product produced by reacting a polyol as a main agent with an isocyanate compound as a curing agent. Examples of polyurethanes include polyether polyurethanes, polyester polyurethanes, and the like. A polyether polyurethane is a cured product produced by reacting a polyether polyol as a main agent with an isocyanate compound as a curing agent. A polyester polyurethane is a cured product produced by reacting a polyester polyol as a main agent with an isocyanate compound as a curing agent.

Examples of isocyanate compounds include aromatic isocyanate compounds such as tolylene diisocyanate (TDI), 4,4′-diphenylmethane diisocyanate (MDI), and xylylene diisocyanate (XDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), and the like. or adducts or polymers of the various isocyanate compounds described above can be used.

The thickness of the first adhesive layer 76 is, for example, 2 μm or more, and may be 3 μm or more. The thickness of the first adhesive layer 76 is, for example, 6 μm or less, and may be 5 μm or less.

(Second biaxially stretched plastic film)
The second biaxially stretched plastic film 72 is a plastic film stretched in two predetermined directions, like the first biaxially stretched plastic film 71 . Like the first biaxially oriented plastic film 71, the second biaxially oriented plastic film 72 also functions as a base material layer for giving the packaging material 70 a predetermined strength. Similarly to the case of the first biaxially stretched plastic film 71, the stretching direction of the second biaxially stretched plastic film 72 is not particularly limited. The draw ratio of the second biaxially oriented plastic film 72 is, for example, 1.05 times or more.

The second biaxially oriented plastic film 72 may contain polyester as a main component. Examples of polyester include PET and PBT, as in the case of the first biaxially oriented plastic film 71 . The polyester content range in the second biaxially oriented plastic film 72 may be the same range as in the case of the first biaxially oriented plastic film 71 . The thickness of the second biaxially stretched plastic film 72 containing polyester as a main component is, for example, 8 μm or more, may be 9 μm or more, or may be 12 μm or more. The thickness of the second biaxially stretched plastic film 72 containing polyester as a main component is, for example, 30 μm or less, may be 25 μm or less, or may be 20 μm or less.

The second biaxially oriented plastic film 72 may contain polyamide as a main component. For example, the second biaxially stretched plastic film 72 may contain 51% by mass or more of polyamide. Examples of polyamides may include aliphatic polyamides or aromatic polyamides. Aliphatic polyamides include nylons such as nylon-6, nylon-6,6, and copolymers of nylon 6 and nylon 6,6, and aromatic polyamides include poly-meta-xylene adipamide ( MXD6) and the like. The polyamide content in the second biaxially stretched plastic film 72 may be 70% by mass or more, 80% by mass or more, 90% by mass or more, or 95% by mass or more. may be The thickness of the second biaxially stretched plastic film 72 containing polyamide as a main component is, for example, 12 μm or more, and may be 15 μm or more. The thickness of the second biaxially stretched plastic film 72 containing polyamide as a main component is, for example, 30 μm or less, may be 25 μm or less, or may be 20 μm or less.

(Second adhesive layer)
The second adhesive layer 77 contains an adhesive for adhering the second biaxially oriented plastic film 72 and the sealant film 75 by dry lamination. Examples of the adhesive for the second adhesive layer 77 include polyurethane, as in the case of the first adhesive layer 76 . In addition to the configuration, materials, and characteristics described below, the configuration, materials, and characteristics of the second adhesive layer 77 may be the same as those of the first adhesive layer 76 .

The thickness of the second adhesive layer 77 is, for example, 2 μm or more, and may be 3 μm or more. The thickness of the second adhesive layer 77 is, for example, 6 μm or less, and may be 5 μm or less.

As described above, aromatic isocyanate compounds and aliphatic isocyanate compounds exist as isocyanate compounds that constitute adhesive curing agents. Aromatic isocyanate compounds elute components that cannot be used in food applications under high-temperature environments such as heat sterilization. The second adhesive layer 77 is in contact with the sealant film 75 . Therefore, when the second adhesive layer 77 contains an aromatic isocyanate compound, the components eluted from the aromatic isocyanate compound are prevented from adhering to the contents accommodated in the accommodation section 18 in contact with the sealant film 75. There is

In consideration of such problems, preferably, the adhesive constituting the second adhesive layer 77 is a cured product produced by reacting a polyol as a main agent and an aliphatic isocyanate compound as a curing agent. Use As a result, it is possible to prevent components that cannot be used for food from adhering to the contents due to the second adhesive layer 77 .

(sealant film)
Next, the sealant film 75 will be explained. The sealant film 75 may be a single layer or multiple layers. The sealant film 75 preferably consists of an unstretched film. The term "unstretched" is a concept including not only films that are not stretched at all but also films that are slightly stretched due to the tension applied during film formation.

The sealant film 75 may satisfy at least one of the following (1) or (2).
(1) Young's modulus is less than 1000 MPa in one direction and a direction perpendicular to one direction (2) Tensile elongation is 300% or more in one direction and a direction perpendicular to one direction

The Young's modulus and tensile elongation of the sealant film 75 are measured according to JIS K7127. Using a Tensilon universal material testing machine RTC-1310A (manufactured by A&D Co., Ltd.), after holding the test piece for 1 minute in an environment with a temperature of 23 ° C. and a relative humidity of 50%, a temperature of 23 ° C. and a relative humidity of 50 %, Young's modulus and tensile elongation of the test piece are measured. Measurement is performed using a rectangular test piece having one side of 15 mm and the other side of 150 mm extending in a direction orthogonal to one side. The measurement is performed in a 23°C environment after holding the test piece for 1 minute in a 23°C environment. The initial distance between the pair of grippers holding the test piece is 100 mm, and the pulling speed is 300 mm/min. As long as the initial distance between the pair of grippers can be measured as 100 mm, the length in the direction orthogonal to one side can be adjusted.

The pouch 10 made of the packaging material 70 is subjected to high-temperature sterilization such as boiling or retorting. Therefore, the sealant film 75 used has heat resistance to withstand these high-temperature treatments.

The melting point of the material forming the sealant film 75 is preferably 150° C. or higher, more preferably 160° C. or higher. By increasing the melting point of the sealant film 75, the pouch 10 can be retorted at a high temperature, thereby shortening the time required for the retort treatment. The melting point of the material forming the sealant film 75 is lower than the melting point of the resin forming the biaxially oriented plastic film.

The sealant film 75 contains propylene as a main component. For example, the sealant film 75 may contain 51% by mass or more of propylene. The propylene content in the sealant film 75 may be 70% by mass or more, 80% by mass or more, 90% by mass or more, or 95% by mass or more.

Specific examples of materials containing propylene as a main component include polypropylenes such as propylene/ethylene block copolymers, propylene/ethylene random copolymers, and homopolypropylenes, and mixtures of polypropylene and polyethylene. can be done. "Propylene-ethylene block copolymer" means a material having the structural formula shown in formula (I) below. "Propylene-ethylene random copolymer" means a material having the structural formula shown in formula (II) below. By "homopolypropylene" is meant a material having the structural formula shown below in formula (III).

When a mixture of polypropylene and polyethylene is used as the propylene-based material, the material may have a sea-island structure. Here, the "sea-island structure" refers to a structure in which polyethylene is discontinuously dispersed within a region in which polypropylene is continuous.

Preferably, sealant film 75 is a single layer film comprising a propylene-ethylene block copolymer. For example, the sealant film 75 is a single-layer unstretched film whose main component is a propylene-ethylene block copolymer. By using the propylene/ethylene block copolymer, the impact resistance of the sealant film 75 can be enhanced, thereby suppressing the pouch 10 from breaking due to impact when dropped. In addition, the puncture resistance of the packaging material 70 can be enhanced.

In addition, by using the propylene/ethylene block copolymer, the strength of the sealing portion constituted by the sealant film 75 at a high temperature, for example, 100° C., that is, the hot seal strength described above, is reduced to a low temperature, for example, 23° C. °C (hereinafter also referred to as room-temperature seal strength). Due to the low hot seal strength, when the pouch 10 is heated using a microwave oven, the first intermediate portion 35 is easily peeled off, and the steam in the containing portion 18 is easily released to the outside of the pouch 10 . Therefore, it is possible to prevent the internal pressure of the containing portion 18 from becoming excessively high, thereby preventing the packaging material 70 from being damaged during heating.

The propylene/ethylene block copolymer includes, for example, a sea component made of polypropylene and an island component made of an ethylene/propylene copolymer rubber component. The sea component can contribute to enhancing blocking resistance, heat resistance, rigidity, seal strength, etc. of the propylene/ethylene block copolymer. Also, the island component can contribute to increasing the impact resistance of the propylene/ethylene block copolymer. Therefore, by adjusting the ratio of the sea component and the island component, the mechanical properties of the sealant film 75 containing the propylene/ethylene block copolymer can be adjusted.

In the propylene/ethylene block copolymer, the mass ratio of the sea component made of polypropylene is higher than the mass ratio of the island component made of the ethylene/propylene copolymer rubber component. For example, in a propylene/ethylene block copolymer, the mass ratio of the sea component made of polypropylene is at least 51% by mass or more, preferably 60% by mass or more, and more preferably 70% by mass or more.

The single-layer sealant film 75 may further contain a second thermoplastic resin in addition to the first thermoplastic resin made of a propylene-ethylene block copolymer. Examples of the second thermoplastic resin include α-olefin copolymers and polyethylene. The α-olefin copolymer is, for example, linear low density polyethylene. Examples of polyethylene include low density polyethylene, medium density polyethylene and high density polyethylene. The second thermoplastic resin can contribute to increasing the impact resistance of the sealant film 75 . Moreover, by using the second thermoplastic resin, the above-mentioned hot seal strength can be made even smaller than the normal temperature seal strength.

Low-density polyethylene is polyethylene having a density of 0.910 g/cm ³ or more and 0.925 g/cm ³ or less. Medium density polyethylene is polyethylene having a density of 0.926 g/cm ³ or more and 0.940 g/cm ³ or less. High-density polyethylene is polyethylene having a density of 0.941 g/cm ³ or more and 0.965 g/cm ³ or less. Low-density polyethylene is obtained by polymerizing ethylene at a high pressure of, for example, 1000 atmospheres or more and less than 2000 atmospheres. Medium-density polyethylene and high-density polyethylene are obtained by polymerizing ethylene at a medium or low pressure of 1 atmosphere or more and less than 1000 atmospheres, for example.

The medium-density polyethylene and the high-density polyethylene may partially contain a copolymer of ethylene and α-olefin. Also, even when ethylene is polymerized at medium or low pressure, medium or low density polyethylene can be produced if it contains a copolymer of ethylene and an α-olefin. Such polyethylene is referred to as the linear low density polyethylene mentioned above. Linear low-density polyethylene is obtained by copolymerizing an α-olefin into a linear polymer obtained by polymerizing ethylene at medium or low pressure to introduce short chain branches. Examples of α-olefins include 1-butene (C ₄ ), 1-hexene (C ₆ ), 4-methylpentene (C ₆ ), 1-octene (C ₈ ), and the like. The density of linear low-density polyethylene is, for example, 0.915 g/cm ³ or more and 0.945 g/cm ³ or less.

The α-olefin copolymer that constitutes the second thermoplastic resin of the propylene/ethylene block copolymer is not limited to the linear low-density polyethylene described above. An α-olefin copolymer means a material having a structural formula shown in formula (IV) below.

Ｒ_１、Ｒ_２はいずれも、Ｈ（水素原子）、又はＣＨ_３、Ｃ_２Ｈ_５などのアルキル基である。また、ｊ及びｋはいずれも、１以上の整数である。また、ｊはｋよりも大きい。すなわち、式（IV）に示すα－オレフィン共重合体においては、Ｒ_１を含む左側の構造がベースとなる。Ｒ_１は例えばＨであり、Ｒ_２は例えばＣ_２Ｈ_５である。

Both R ₁ and R ₂ are H (hydrogen atom) or alkyl groups such as CH ₃ and C ₂ H ₅ . Both j and k are integers of 1 or more. Also, j is greater than k. That is, in the α-olefin copolymer shown in formula (IV), the structure on the left containing R ₁ is the base. R ₁ is for example H and R ₂ is for example C ₂ H ₅ .

In the sealant film 75, the mass ratio of the first thermoplastic resin made of the propylene/ethylene block copolymer is higher than the mass ratio of the second thermoplastic resin containing at least the α-olefin copolymer or polyethylene. For example, in the single-layer sealant film 75, the mass ratio of the first thermoplastic resin made of a propylene/ethylene block copolymer is at least 51% by mass or more, preferably 60% by mass or more, and more preferably It is 70% by mass or more.

As described above, the second thermoplastic resin can contribute to increasing the impact resistance of sealant film 75 . Therefore, by adjusting the mass ratio of the second thermoplastic resin containing at least the α-olefin copolymer or polyethylene in the single-layer sealant film 75, the mechanical properties of the sealant film 75 can be adjusted.

The sealant film 75 may further contain a thermoplastic elastomer. By using a thermoplastic elastomer, the impact resistance and puncture resistance of the sealant film 75 can be further enhanced.

The thermoplastic elastomer is, for example, a hydrogenated styrene thermoplastic elastomer. The hydrogenated styrenic thermoplastic elastomer has a structure consisting of a polymer block A mainly composed of at least one vinyl aromatic compound and a polymer block B mainly composed of at least one hydrogenated conjugated diene compound. . The thermoplastic elastomer may also be an ethylene/α-olefin elastomer. Ethylene/α-olefin elastomers are low-crystalline or amorphous copolymer elastomers, and are random copolymers of 50 to 90% by mass of ethylene as a main component and α-olefin as a copolymerization monomer. be.

The content of the propylene/ethylene block copolymer in the sealant film 75 is, for example, 80% by mass or more, preferably 90% by mass or more.

As a method for producing a propylene/ethylene block copolymer, there is a method of polymerizing raw materials such as propylene and ethylene using a catalyst. A Ziegler-Natta type catalyst, a metallocene catalyst, or the like can be used as the catalyst.

The thickness of the sealant film 75 is, for example, 30 μm or more, may be 40 μm or more, may be 50 μm or more, or may be 60 μm or more. The thickness of the sealant film 75 is, for example, 100 μm or less, and may be 80 μm or less.

As the single-layer sealant film 75 containing a propylene/ethylene block copolymer, there is a type such as ZK500, which will be described later, which has high tensile elongation and impact resistance. This type of sealant film 75 preferably also has the property of low hot seal strength. As a result, it is possible to prevent the internal pressure of the containing portion 18 from becoming excessive when the pouch 10 is heated.

The tensile elongation of the sealant film 75 at 23° C. in the machine direction (MD) is, for example, 800% or more, may be 900% or more, may be 1000% or more, or may be 1100% or more. good too. The product of the tensile elongation (%) of the sealant film 75 in the machine direction (MD) and the thickness (μm) of the sealant film 75 may be 45000 or more, 50000 or more, or 55000 or more. may be 60000 or more. The tensile elongation at 23° C. of the sealant film 75 in the vertical direction (TD) is, for example, 1050% or more, and may be 1100% or more. The product of the tensile elongation (%) of the sealant film 75 and the thickness (μm) of the sealant film 75 in the vertical direction (TD) may be 53000 or more, or 60000 or more. Since the sealant film 75 has a high tensile elongation, it is possible to prevent the pouch 10 from being broken due to an impact when dropped.

The Young's modulus of the sealant film 75 at 23° C. in the machine direction (MD) is, for example, 670 MPa or less, and may be 650 MPa or less. The product of the Young's modulus (MPa) of the sealant film 75 and the thickness (μm) of the sealant film 75 in the machine direction (MD) is, for example, 38000 or less, and may be 35000 or less. The Young's modulus of the sealant film 75 in the vertical direction (TD) at 23° C. is, for example, 550 MPa or less, and may be 500 MPa or less. The product of the Young's modulus (MPa) of the sealant film 75 and the thickness (μm) of the sealant film 75 in the vertical direction (TD) is, for example, 30000 or less, and may be 25000 or less.

The packaging material 70 may further comprise a printed layer 81, as shown in FIG. The printed layer 81 is a layer provided on the packaging material 70 in order to display product information on the packaging material 70 and to give the packaging material 70 an aesthetic appearance. The printed layer 81 is provided, for example, on the first biaxially stretched plastic film 71 . The print layer 81 expresses characters, numbers, symbols, graphics, patterns, and the like. The print layer 81 includes, for example, a coloring material such as ink and a binder resin. Finart manufactured by DIC Graphics Corporation can be used as the ink for gravure printing.

12A and 12B are cross-sectional views showing other examples of the layer structure of the packaging material 70. FIG. As shown in FIGS. 12A and 12B, the packaging material 70 may comprise a transparent vapor deposition layer 82 located between the first biaxially oriented plastic film 71 and the second biaxially oriented plastic film 72 . The packaging material 70 may have a transparent gas barrier coating film 83 located on the surface of the transparent deposition layer 82 . As shown in FIG. 12A, a transparent deposition layer 82 may be provided on the inner surface of the first biaxially oriented plastic film 71 . As shown in FIG. 12B, a transparent vapor deposition layer 82 may be provided on the outer surface of the second biaxially oriented plastic film 72 .

[Transparent deposition layer]
The transparent vapor deposition layer 82 may consist of a single vapor deposition layer, or may include two or more vapor deposition layers. The transparent deposited layer 82 includes two or more deposited layers, each of which may have the same composition or different compositions. Examples of the method for forming the transparent deposition layer 82 include physical vapor deposition methods (physical vapor deposition method, PVD method) such as vacuum deposition method, sputtering method, and ion plating method, plasma chemical vapor deposition method, Chemical vapor deposition methods (Chemical Vapor Deposition method, CVD method) such as thermal chemical vapor deposition method and photochemical vapor deposition method can be used. Specifically, a vapor deposition layer can be formed on a film forming roller using a roller type vapor deposition film forming apparatus.

The transparent deposition layer 82 is made of a transparent inorganic material. Examples of inorganic materials include metal oxides and inorganic oxides. Metal oxides include aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron (B), titanium (Ti), lead (Pb). , zirconium (Zr) and yttrium (Y). Examples of inorganic oxides include oxides of silicon (Si). Aluminum oxide (aluminum oxide) or silicon oxide is preferable as the inorganic material constituting the transparent deposition layer.

The thickness of the transparent deposition layer 82 is, for example, 20 Å or more, 30 Å or more, 40 Å or more, 50 Å or more, 60 Å or more, or 70 Å or more. may The thickness of the transparent deposited layer 82 is, for example, 150 Å or less, may be 130 Å or less, may be 120 Å or less, or may be 110 Å or less.

[Gas barrier coating film]
The transparent gas barrier coating film 83 has transparency. The transparent gas barrier coating film 83 can suppress permeation of oxygen gas and water vapor. The transparent gas barrier coating film 83 has the general formula R ¹ _n M (OR ² ) _m (wherein R ¹ and R ² represent an organic group having 1 to 8 carbon atoms and M represents a metal atom). , n represents an integer of 0 or more, m represents an integer of 1 or more, and n+m represents the valence of M.) and at least one or more alkoxides represented by the above polyvinyl alcohol- A transparent gas barrier composition that contains a sol-based resin and/or an ethylene-vinyl alcohol copolymer, and is polycondensed by the sol-gel method in the presence of a sol-gel catalyst, acid, water, and an organic solvent. can get.

As the alkoxide represented by the general formula R ¹ _n M(OR ² ) _m , at least one of partial hydrolyzate of alkoxide and condensate of hydrolysis of alkoxide can be used. The partial hydrolyzate of the above alkoxide does not need to have all of the alkoxy groups hydrolyzed, and may be those in which one or more alkoxy groups are hydrolyzed, or a mixture thereof. As the condensate obtained by hydrolysis of alkoxide, a partially hydrolyzed alkoxide dimer or higher, specifically a dimer to hexamer, is used.

In the alkoxide represented by the general formula R ¹ _n M(OR ² ) _m , the metal atom represented by M can be silicon, zirconium, titanium, aluminum, or the like. Preferred metals include, for example, silicon and titanium. In addition, in the present embodiment, alkoxides can be used singly or as a mixture of alkoxides of two or more different metal atoms in the same solution.

Further, in the alkoxide represented by the general formula R ¹ _n M(OR ² ) _m , specific examples of the organic group represented by R ¹ include a methyl group, an ethyl group, an n-propyl group, i -propyl group, n-butyl group, i-butyl group, sec-butyl group, t-butyl group, n-hexyl group, n-octyl group, and the like. Further, in the alkoxide represented by the general formula R ¹ _n M(OR ² ) _m , specific examples of the organic group represented by R ² include a methyl group, an ethyl group, an n-propyl group, i -propyl group, n-butyl group, sec-butyl group, and the like. These alkyl groups may be the same or different in the same molecule.

For example, a silane coupling agent or the like may be added when preparing the transparent gas barrier composition. Known organic reactive group-containing organoalkoxysilanes can be used as the silane coupling agent. In particular, organoalkoxysilanes having an epoxy group are preferably used, and specific examples include γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, or β-(3, 4-epoxycyclohexyl)ethyltrimethoxysilane and the like can be used. The above silane coupling agents may be used singly or in combination of two or more.

The thickness of the transparent gas barrier coating film 83 is, for example, 100 nm or more, may be 125 nm or more, may be 150 nm or more, or may be 200 nm or more. Thereby, stable gas barrier properties can be obtained. The thickness of the transparent gas barrier coating film 83 is, for example, 500 nm or less, may be 450 nm or less, may be 400 nm or less, or may be 300 nm or less.

As shown in Figures 11, 12A and 12B, the packaging material 70 may contain only two biaxially oriented plastic films. A specific example of the packaging material 70 in this case is shown below. "/" is used as a notation indicating a boundary between layers when listing the layers. The layers are listed from left to right, lining up from the outside to the inside of the pouch.
Biaxially oriented PET film/printed layer/adhesive layer/biaxially oriented nylon film/adhesive layer/sealant film Biaxially oriented PET film/printed layer/adhesive layer/biaxially oriented PET film/adhesive layer/sealant film Biaxially oriented PET film/transparent vapor deposition layer/transparent gas barrier coating film/printing layer/adhesive layer/biaxially oriented nylon film/adhesive layer/sealant film Biaxially oriented PET film/transparent vapor deposition layer/transparent gas barrier coating film /Printed layer/Adhesive layer/Biaxially stretched PET film/Adhesive layer/Sealant film Biaxially stretched PET film/Printed layer/Adhesive layer/Transparent gas barrier coating film/Transparent deposition layer/Biaxially stretched PET film/Adhesion Agent layer/sealant film

Preferred properties of the packaging material 70 are described when the packaging material 70 contains only two biaxially oriented plastic films. Specifically, the preferred hot breaking strength and hot sealing strength of the packaging material 70 will be described.

The packaging material 70 has a unidirectional breaking strength (hot breaking strength) of 33.0 MPa or more when measured in a 100° C. environment after holding for 1 minute in a 100° C. environment. The unidirectional hot breaking strength of the packaging material 70 is preferably 36.0 MPa or more, more preferably 39.0 MPa or more, further preferably 42.0 or more, and 45.0 MPa or more. is more preferable. The hot breaking strength in the direction perpendicular to one direction of the packaging material 70 is preferably 29.0 MPa or more, more preferably 32.0 MPa or more, and further preferably 35.0 MPa or more, Most preferably, it is 38.0 MPa or more. The hot breaking strength in one direction of the packaging material 70 is preferably 50.0 MPa or less, and the hot breaking strength of the packaging material 70 in a direction perpendicular to the one direction is 45.0 MPa or less. is preferred. The one direction of the packaging material 70 may be, for example, the first direction D1 in the pouch 10, and the direction perpendicular to the one direction of the packaging material 70 may be, for example, the second direction D2 in the pouch 10. Also, for example, the machine direction (MD) of the packaging material 70 may correspond to the first direction D1 of the pouch 10, and the vertical direction (TD) of the packaging material 70 may correspond to the second direction D2 of the pouch 10, for example. . Further, for example, one direction of the packaging material 70 may correspond to the machine direction (MD), and for example, the direction perpendicular to the one direction of the packaging material may correspond to the vertical direction (TD).

A test piece cut from the packaging material 70 is used to measure the properties of the packaging material 70 . If packaging material 70 is available prior to packaging material 70 being processed into pouch 10 , test strips may be made by cutting packaging material 70 . A test strip may be made by cutting a product made from packaging material 70, such as pouch 10. FIG. FIG. 14 shows an example of a method of preparing a test piece by cutting the front film 15 or back film 16 of the pouch 10. As shown in FIG. When measuring the properties of the packaging material 70 in the machine direction, the surface film 15 or the back film 16 of the pouch 10 is cut so that the long side direction of the test piece matches the machine direction, as indicated by reference numeral 90A in FIG. to prepare a test piece. When measuring the properties of the packaging material 70 in the vertical direction, the surface film 15 or the back film 16 of the pouch 10 is cut so that the long side direction of the test piece coincides with the vertical direction, as indicated by reference numeral 90B in FIG. to prepare a test piece.

The measurement of the hot breaking strength of the packaging material 70 is performed according to JIS K7127 except for the length of the test pieces 90A and 90B. The length and width of test pieces 90A and 90B are 100 mm and 15 mm.

A Tensilon universal material testing machine RTC-1310A (manufactured by A&D Co., Ltd.) is used to measure the hot breaking strength of test pieces 90A and 90B. Specifically, first, as shown in FIG. 15, the gripping tools 91 and 92 grip both ends of the test pieces 90A and 90B in the longitudinal direction. Then, after holding the test pieces 90A and 90B for 1 minute in an environment with a temperature of 100° C. and a relative humidity of 5%, the initial gripper distance S1 (see FIG. 15) is set in an environment with a temperature of 100° C. and a relative humidity of 5%. A tensile test is performed by pulling the test pieces 90A and 90B in the longitudinal direction of the test pieces 90A and 90B at a tensile speed of 300 mm/min in a state of 50 mm, and the hot breaking strength of the test pieces 90A and 90B is measured. The hot breaking strength is measured for the five test pieces 90A and 90B, and the average value is taken as the hot breaking strength in the flow direction and vertical direction of the packaging material 70 .

The packaging material 70 has a seal strength (hot seal strength) of, for example, 13.0 N or less when measured in an environment of 100° C. after being held in an environment of 100° C. for 1 minute. The hot seal strength may be 11.0 N or less, 10.0 N or less, 8.0 N or less, or 6.0 N or less. If the hot seal strength is too low, it is conceivable that the first intermediate portion 35 will peel off before the contents are sufficiently heated and pressurized, resulting in a decrease in the pressure and temperature of the housing portion 18 . Considering this point, the hot seal strength of the sealed portion of the packaging material 70 is, for example, 3.0 N or more, may be 4.0 N or more, or may be 5.0 N or more. Note that the seal strength of the packaging material 70 may also change due to sterilization treatment such as retort treatment. It means the seal strength of the seal part in the packaging material 70 of the pouch after being applied.

In measuring the hot seal strength of the packaging material 70, a test piece cut out from the packaging material 70 whose inner surfaces are bonded together is used. If packaging material 70 is available prior to packaging material 70 being processed into pouch 10, test strips may be made by cutting packaging material 70 with the inner surfaces joined together. A test strip may be made by cutting a product made from packaging material 70, such as pouch 10. FIG. FIG. 16 is a diagram showing an example of a method of preparing a test piece by cutting the front film 15 and the back film 16 whose inner surfaces are bonded together. For example, the surface film 15 and the back film 16 of the pouch 10 are cut so as to include the first side seal portion 30 or the second side seal portion 50 to prepare the test piece 90C. The length and width of test piece 90C are 70 mm and 15 mm.

The hot seal strength is measured using a Tensilon universal material testing machine RTC-1310A (manufactured by A&D Co., Ltd.) in accordance with JIS Z1707:1997 7.5. First, the two packaging materials 70 at the unsealed portion of the test piece 90C are respectively gripped by grippers 93 and 94 (see FIG. 17A) of the testing machine. Then, the gripping tools 93 and 94 are respectively pulled in opposite directions to each other in the direction orthogonal to the surface direction of the seal portion of the test piece 90C at a speed of 300 mm/min, and the maximum value MAX of the tensile stress F1 is measured ( See Figure 17B). The spacing S2 between the grippers 93, 94 at the start of pulling is 50 mm and the spacing S2 between the grippers 93, 94 at the start of pulling is 60 mm. Let the maximum value MAX be the seal strength (see FIG. 17B). The measurement of the hot seal strength is performed in an environment of 100° C. and 5% relative humidity after holding the test piece 90C in an environment of 100° C. and 5% relative humidity for 1 minute. The hot seal strength of five test pieces 90</b>C is measured, and the average value is taken as the hot seal strength of the packaging material 70 .

In addition, in a plurality of test pieces 90C produced from the pouch 10, when the dimension of the seal portion in the longitudinal direction is not constant, as shown in FIGS. The slope of the graph when increases may differ depending on the test piece 90C.

The thickness of the packaging material 70 containing only two biaxially stretched plastic films is, for example, 80 μm or more, may be 90 μm or more, or may be 100 μm or more. The thickness of the packaging material 70 containing only two biaxially oriented plastic films is, for example, 130 μm or less, and may be 120 μm or less.

FIG. 13 is a cross-sectional view showing another example of the layer structure of the packaging material 70. As shown in FIG. The packaging material 70 shown in FIG. 13 comprises a biaxially oriented plastic film 73, an adhesive layer 78 and a sealant film 75 in this order. The biaxially stretched plastic film 73 is positioned on the outer surface 70y side, and the sealant film 75 is positioned on the inner surface 70x side. The inner surface 70x faces the accommodating portion 18 . There is only one biaxially oriented plastic film in the packaging material 70 . The packaging material 70 may comprise a transparent vapor deposited layer 82 provided on the side of the biaxially oriented plastic film 73 . The packaging material 70 may have a transparent gas barrier coating film 83 located on the surface of the transparent deposition layer 82 .

The biaxially stretched plastic film 73 is a plastic film stretched in two predetermined directions, like the first biaxially stretched plastic film 71 . As the biaxially stretched plastic film 73, the biaxially stretched plastic film described in the first biaxially stretched plastic film 71 may be used.

As the biaxially stretched plastic film 73, a biaxially stretched plastic film having a loop stiffness of 0.0017 N or more in at least one direction and containing polyester as a main component may be used. In the following description, a biaxially oriented plastic film having a loop stiffness of 0.0017 N or more in at least one direction and containing polyester as a main component is also referred to as a high stiffness polyester film. A high stiffness polyester film, for example, has a loop stiffness of 0.0017 N or greater in at least one of the machine direction (MD) or vertical direction (TD). A high stiffness polyester film may, for example, have a loop stiffness of 0.0017 N or greater in both the machine direction (MD) and the vertical direction (TD). The inclusion of the high stiffness polyester film in the packaging material 70 allows the packaging material 70 to have excellent puncture strength even with only one biaxially oriented plastic film in the packaging material 70 . High stiffness polyester films do not contain polyamides.

The polyester for the high-stiffness polyester film includes at least one aromatic dicarboxylic acid selected from terephthalic acid, isophthalic acid and 2,6-naphthalenedicarboxylic acid, ethylene glycol, 1,3-propanediol and 1,4-butane. A polyester mainly composed of an aromatic polyester comprising at least one aliphatic alcohol selected from diols is preferred. For example, polyester is PET, PBT, and the like. Examples of the high-stiffness polyester film include a high-stiffness PET film containing 51% by mass or more of PET as a main component and a high-stiffness PBT film containing 51% by mass or more of PBT as a main component. The PET content in the high-stiffness PET film may be 80% by mass or more, 90% by mass or more, or 95% by mass or more. The thickness of the high-stiffness polyester film is, for example, 5 μm or more, may be 7 μm or more, may be 10 μm or more, may be 12 μm or more, or may be 4 μm or more. The thickness of the high-stiffness polyester film is, for example, 30 μm or less, may be 25 μm or less, or may be 20 μm or less.

Loop stiffness is a parameter representing stiffness of a film such as a biaxially oriented plastic film. A method of measuring loop stiffness will be described below with reference to FIGS. 18 to 23. FIG. The measurement method described below can be used not only for single-layer films such as biaxially stretched plastic films, but also for multi-layer films such as vapor-deposited films and laminated films. A vapor deposition film is a film including a single layer film such as a biaxially oriented plastic film and a vapor deposition layer formed on the single layer film. A laminated film is a film, such as packaging material 70, that includes multiple films laminated together.

18 is a plan view showing the test piece 90 and the loop stiffness measuring device 95, and FIG. 19 is a cross-sectional view of the test piece 90 and the loop stiffness measuring device 95 of FIG. 18 along line C-C. The test piece 90 is a rectangular film having long sides and short sides. In the present application, the long side length S3 of the test piece 90 was set to 150 mm, and the short side length S4 was set to 15 mm. As the loop stiffness measuring device 95, for example, No. 1 manufactured by Toyo Seiki Co., Ltd. A 581 Loop Stiffness Tester® LOOP STIFFNESS TESTER Model DA can be used. The length S3 of the long side of the test piece 90 can be adjusted as long as the test piece 90 can be gripped by a pair of chuck portions 96, which will be described later.

The loop stiffness measuring instrument 95 has a pair of chuck portions 96 for gripping a pair of longitudinal ends of the test piece 90 and a support member 97 that supports the chuck portions 96 . The chuck part 96 includes a first chuck 961 and a second chuck 962 . 18 and 19, the test piece 90 is placed on the pair of first chucks 961, and the second chuck 962 still grips the test piece 90 between itself and the first chucks 961. not As will be described later, the test piece 90 is gripped between a first chuck 961 and a second chuck 962 of the chuck portion 96 during measurement. The second chuck 962 may be connected to the first chuck 961 via a hinge mechanism.

If the film to be measured, such as a biaxially stretched plastic film, vapor-deposited film, or laminated film, is available in a state before the film is processed into a packaged product, the test piece 90 can be obtained by cutting the film to be measured. may be made. Test strips 90 may also be made by cutting a packaged product made from packaging material 70, such as a pouch. When measuring the loop stiffness of the packaging material 70 in the machine direction, a test piece 90A shown in FIG. 14 can be used. When measuring the loop stiffness of the packaging material 70 in the vertical direction, a test piece 90B shown in FIG. 14 can be used.

A method of measuring the loop stiffness of the test piece 90 using the loop stiffness measuring device 95 will be described. First, as shown in FIGS. 18 and 19, the test piece 90 is placed on the first chucks 961 of the pair of chuck portions 96 spaced apart by an interval S5. In the present application, the interval S5 is set so that the length of the loop portion 901 described later (hereinafter also referred to as loop length) is 60 mm. The test piece 90 includes an inner surface 90x positioned on the side of the first chuck 961 and an outer surface 90y positioned on the opposite side of the inner surface 90x. When test strip 90 is made of packaging material 70 , inner surface 90 x and outer surface 90 y of test strip 90 match inner surface 70 x and outer surface 70 y of packaging material 70 . When the loop portion 901 to be described later is formed in the test piece 90 , the inner surface 90 x is positioned inside the loop portion 901 and the outer surface 90 y is positioned outside the loop portion 901 . Subsequently, as shown in FIG. 20 , the second chuck 962 is placed on the test piece 90 so as to grip the ends of the test piece 90 in the longitudinal direction between the first chuck 961 and the first chuck 961 .

Subsequently, as shown in FIG. 21, at least one of the pair of chuck portions 96 is slid on the support member 97 in the direction in which the distance between the pair of chuck portions 96 is reduced. Thereby, the loop portion 901 can be formed in the test piece 90 . A test piece 90 shown in FIG. 21 has a loop portion 901 , a pair of intermediate portions 902 and a pair of fixing portions 903 . A pair of fixed portions 903 are portions of the test piece 90 that are held by a pair of chuck portions 96 . The pair of intermediate portions 902 are portions of the test piece 90 located between the loop portion 901 and the pair of intermediate portions 902 . As shown in FIG. 21, the chuck portion 96 is slid on the support member 97 until the inner surfaces 90x of the pair of intermediate portions 902 come into contact with each other. Thereby, a loop portion 901 having a loop length of 60 mm can be formed. The loop length of the loop portion 901 is the position Q1 where the surface of the second chuck 962 on the loop portion 901 side and the test piece 90 intersect, and the surface of the other second chuck 962 on the loop portion 901 side and the test piece 90. is the length of the test piece 90 between the crossing position Q2. When the thickness of the test piece 90 is ignored, the above-mentioned interval S5 is the value obtained by adding 2×t to the length of the loop portion 901 . t is the thickness of the second chuck 962 of the chuck portion 96 .

After that, as shown in FIG. 22, the posture of the chuck portion 96 is adjusted so that the projection direction Y of the loop portion 901 with respect to the chuck portion 96 is horizontal. For example, the posture of the chuck portion 96 supported by the support member 97 is adjusted by moving the support member 97 so that the normal direction of the support member 97 faces the horizontal direction. In the example shown in FIG. 22, the projecting direction Y of the loop portion 901 matches the thickness direction of the chuck portion. Also, the load cell 98 is prepared at a position separated from the second chuck 962 by a distance Z1 in the projecting direction Y of the loop portion 901 . In this application, the distance Z1 is set to 50 mm. Subsequently, the load cell 98 is moved at a speed V toward the loop portion 901 of the test piece 90 by a distance Z2 shown in FIG. The distance Z2 is set so that the load cell 98 contacts the loop portion 901 and then the load cell 98 pushes the loop portion 901 toward the chuck portion 96 side. In this application, the distance Z2 is set to 40 mm. In this case, the distance Z3 between the load cell 98 and the second chuck 962 of the chuck portion 96 when the load cell 98 pushes the loop portion 901 toward the chuck portion 96 is 10 mm. A speed V for moving the load cell 98 was set to 3.3 mm/sec.

Subsequently, in the state shown in FIG. 23 where the load cell 98 is pushing the loop portion 901 of the test piece 90, after the value of the load applied from the loop portion 901 to the load cell 98 is stabilized, the load value is recorded. . The value of the load obtained in this way is adopted as the loop stiffness of the film forming the test piece 90 . In the present application, unless otherwise specified, the environment during the loop stiffness measurement is 23° C. temperature and 50% relative humidity.

By using a high-stiffness film having a loop stiffness of 0.0017 N or more in at least one direction as the biaxially stretched plastic film 73, the puncture strength of the biaxially stretched plastic film 73 can be increased. As a result, the puncture strength of the packaging material 70 including the biaxially stretched plastic film 73 can be, for example, 12.0 N or more, more preferably 13.0 N or more, and still more preferably 14.0 N or more. can do.

Preferred mechanical properties of the high stiffness polyester film are further described.
The puncture strength of the high-stiffness polyester film is preferably 10 N or more, more preferably 11 N or more.

The tensile strength of the high stiffness polyester film in at least one direction is preferably 250 MPa or higher, more preferably 280 MPa or higher. For example, the tensile strength of the high stiffness polyester film in the machine direction is preferably 250 MPa or higher, more preferably 280 MPa or higher. Also, the tensile strength of the high-stiffness polyester film in the vertical direction is preferably 250 MPa or more, more preferably 280 MPa or more.
The tensile elongation of the high stiffness polyester film in at least one direction is preferably 130% or less, more preferably 120% or less. For example, the tensile elongation of the high stiffness polyester film in the machine direction is preferably 130% or less, more preferably 120% or less. Further, the tensile elongation of the high stiffness polyester film in the vertical direction is preferably 120% or less, more preferably 110% or less.
Preferably, the value obtained by dividing the tensile strength of the high-stiffness polyester film by the tensile elongation is 2.0 [MPa/%] or more in at least one direction. For example, the value obtained by dividing the tensile strength of the high-stiffness polyester film in the vertical direction (TD) by the tensile elongation is preferably 2.0 [MPa/%] or more, more preferably 2.2 [MPa/%]. That's it. The value obtained by dividing the tensile strength of the high-stiffness polyester film in the machine direction (MD) by the tensile elongation is preferably 1.8 [MPa/%] or more, more preferably 2.0 [MPa/%] or more. be.

Tensile strength and tensile elongation can be measured according to JIS K7127. As a measuring instrument, a tensile tester STA-1150 manufactured by Orientec Co., Ltd. can be used. As a test piece, a rectangular film having a width of 15 mm and a length of 150 mm cut out from a high stiffness polyester film can be used. The distance between the pair of chucks holding the specimen at the start of the measurement is 100 mm, and the pulling speed is 300 mm/min. Note that the length of the test piece can be adjusted as long as the test piece can be gripped by the pair of chucks. In the present application, unless otherwise specified, the environment for measuring the tensile strength and tensile elongation of the high-stiffness polyester film is a temperature of 23° C. and a relative humidity of 50%.
The tensile strength and tensile elongation of the packaging material 70 were measured by using a tensile tester RTC-1310A manufactured by Orientec as a measuring instrument, and between a pair of chucks holding the test piece at the start of measurement. The measurements are the same as for the high stiffness polyester film, except that the spacing is 50 mm. When measuring the tensile strength and tensile elongation of the packaging material 70, the surface film 15 or the back film of the pouch 10 is applied so that the long side direction of the test piece coincides with the machine direction or the vertical direction, as in the case of loop stiffness measurement. By cutting 16, a test piece can be produced.

The heat shrinkage of the high stiffness polyester film in at least one direction is preferably 0.7% or less, more preferably 0.5% or less. For example, the heat shrinkage of the high-stiffness polyester film in the machine direction is preferably 0.7% or less, more preferably 0.5% or less. The heat shrinkage of the high-stiffness polyester film in the vertical direction is preferably 0.7% or less, more preferably 0.5% or less. The heating temperature for measuring the thermal shrinkage is 100° C., and the heating time is 40 minutes.
The Young's modulus of the high stiffness polyester film in at least one direction is preferably 4.0 GPa or higher, more preferably 4.5 MPa or higher. For example, the Young's modulus of the high stiffness polyester film in the machine direction is preferably 4.0 GPa or higher, more preferably 4.5 MPa or higher. The Young's modulus of the high stiffness polyester film in the vertical direction is preferably 4.0 GPa or more, more preferably 4.5 GPa or more.

Young's modulus, like tensile strength and tensile elongation, can be measured according to JIS K7127. As a measuring instrument, a tensile tester STA-1150 manufactured by Orientec Co., Ltd. can be used. As a test piece, a rectangular film having a width of 15 mm and a length of 150 mm cut out from a high stiffness polyester film can be used. The distance between the pair of chucks holding the specimen at the start of the measurement is 100 mm, and the pulling speed is 300 mm/min. Note that the length of the test piece can be adjusted as long as the test piece can be gripped by the pair of chucks. In the present application, unless otherwise specified, the environment for measuring the Young's modulus of the high-stiffness polyester film is a temperature of 23° C. and a relative humidity of 50%.
In addition, the Young's modulus of the packaging material 70 is measured by using a tensile tester RTC-1310A manufactured by Orientec as a measuring instrument, and between a pair of chucks holding the test piece, the distance at the start of measurement is 50 mm. Measured in the same manner as for the high stiffness polyester film, except. When measuring the Young's modulus of the packaging material 70, a test piece can be prepared by cutting the surface film 15 or the back film 16 of the pouch 10 so that the long side direction of the test piece matches the machine direction or the vertical direction. can.

In the process of producing a high-stiffness polyester film, for example, first, a plastic film obtained by melting and molding polyester is stretched 3 to 4.5 times at 90° C. to 145° C. in the machine direction and the vertical direction, respectively. A first stretching step of stretching to is carried out. Subsequently, the plastic film is stretched 1.1 times to 3.0 times at 100° C. to 145° C. in the machine direction and the vertical direction, respectively. Thereafter, heat setting is performed at a temperature of 190°C to 220°C. Subsequently, a relaxation treatment (a treatment to reduce the width of the film) of about 0.2% to 2.5% is performed at a temperature of 100° C. to 190° C. in the machine direction and the vertical direction. By adjusting the draw ratio, draw temperature, heat setting temperature, and relaxation treatment rate in these steps, a high-stiffness polyester film having the mechanical properties described above can be obtained.

By including the high stiffness polyester film in the packaging material 70, the packaging material 70 and the packaged product such as the pouch 10 constructed from the packaging material 70 can be provided with excellent puncture strength. As a result, for example, when a sharp member with a sharp tip contacts the pouch 10, it is possible to prevent the pouch 10 from tearing. The puncture strength of the packaging material 70 is preferably 12.0 N or more, preferably 13.0 N or more, and more preferably 14.0 N or more. A method for measuring the puncture strength will be described in the examples below.

Moreover, the Young's modulus of the packaging material 70 can be increased by including the high-stiffness polyester film in the packaging material 70 . The Young's modulus of the packaging material 70 in one direction is, for example, 3600 MPa or more, may be 3700 MPa or more, may be 3800 MPa or more, may be 3900 MPa or more, may be 4000 MPa or more, or may be 4100 MPa. or more. For example, the Young's modulus of the packaging material 70 in the machine direction (MD) is, for example, 3600 MPa or higher, may be 3700 MPa or higher, may be 3800 MPa or higher, or may be 3900 MPa or higher. In addition, the Young's modulus of the packaging material 70 in the vertical direction (TD), which is the direction perpendicular to the machine direction (MD), is, for example, 3600 MPa or more, may be 3700 MPa or more, may be 3800 MPa or more, or may be 3900 MPa. or more, 4000 MPa or more, or 4100 MPa or more. The high Young's modulus of the packaging material 70 makes the packaging material 70 difficult to stretch. For this reason, the processing precision when processing the packaging material 70 in the manufacturing process of the packaging product such as the pouch 10 is increased. In addition, when the packaging material 70 is used to manufacture a gusseted pouch 10 configured to be able to stand on its own, as will be described later, the pouch 10 can stand on its own. The Young's modulus of the packaging material 70 in the vertical direction (TD) may be higher than the Young's modulus of the packaging material 70 in the machine direction (MD).

A high stiffness polyester film may be used as the first biaxially oriented plastic film 71 or the second biaxially oriented plastic film 72 shown in FIGS. 11, 12A and 12B.

A packaging material 70 containing only one biaxially oriented plastic film may have a hot seal strength equivalent to a packaging material 70 containing only two biaxially oriented plastic films. The packaging material 70 containing only one biaxially oriented plastic film has a seal strength (hot seal strength) measured in an environment of 100° C. after holding for 1 minute in an environment of 100° C., for example, 13. 0N or less. The hot seal strength may be 11.0 N or less, 10.0 N or less, 8.0 N or less, or 6.0 N or less. The hot seal strength of the sealing portion of the packaging material 70 containing only one biaxially stretched plastic film is, for example, 3.0 N or more, may be 4.0 N or more, or may be 5.0 N or more. .

The adhesive layer 78 contains an adhesive for adhering the biaxially stretched plastic film 73 and the sealant film 75 by dry lamination. As in the case of the first adhesive layer 76, examples of the adhesive for the adhesive layer 78 include polyurethane and the like. In addition to the configuration, materials, and characteristics described below, the configuration, materials, and characteristics of the adhesive layer 78 may be the same as those of the first adhesive layer 76 .

The thickness of the adhesive layer 78 is, for example, 2 μm or more, and may be 3 μm or more. The thickness of the adhesive layer 78 is, for example, 6 μm or less, and may be 5 μm or less.

The thickness of the packaging material 70 containing only one biaxially stretched plastic film is, for example, 70 μm or more, may be 80 μm or more, or may be 90 μm or more. The thickness of the packaging material 70 containing only one biaxially stretched plastic film is, for example, 110 μm or less, and may be 100 μm or less.

Pouch Manufacturing Method Next, a method of manufacturing the pouch 10 using the packaging material 70 will be described. First, the surface film 15 and the back film 16 made of the packaging material 70 are prepared. Subsequently, the inner surface of the surface film 15 and the inner surface of the back film 16 are heat-sealed to form seal portions such as the upper seal portion 11a, the first side seal portion 30, the second side seal portion 50, and the like. The heat sealing temperature is, for example, 160° C. or higher, may be 170° C. or higher, or may be 180° C. or higher. The heat sealing temperature is, for example, 250° C. or lower, may be 240° C. or lower, or may be 230° C. or lower.

The surface film 15 and the back film 16, which are joined together by heat sealing, are cut into appropriate shapes. Further, a through portion 47 is formed in the first non-sealed portion 45 . Thereby, the pouch 10 shown in FIG. 1 can be obtained. Incidentally, the through portion 47 may be formed in the film before the inner surface of the surface film 15 and the inner surface of the back surface film 16 are heat-sealed. Subsequently, the contents are filled into the pouch 10 through the opening 12b of the lower portion 12. As shown in FIG. Thereafter, the lower portion 12 is heat-sealed along the lower edge 12x to form the lower seal portion 12a. In this way, as shown in FIG. 4, the pouch 10 in which the content 19 is housed and sealed can be obtained. Thereafter, the pouch 10 may be subjected to sterilization treatment such as boiling treatment or retort treatment. Pouches 10 may be housed inside carton 100 .

Pouch Heating Method Next, a method for heating the pouch 10 will be described. First, the lid 102 of the carton 100 is opened. Subsequently, the lid 102 is rotated toward the back side of the body portion 101 . The pouch 10 housed in the carton 100 in this state is placed in the microwave oven. Then, the pouch 10 is heated using a microwave oven. Moisture contained in the content 19 evaporates and the pressure in the containing portion 18 increases.

As the pressure in the storage portion 18 increases, the pouch 10 swells, for example, in a circular shape around the center point C of the storage portion 18 . Therefore, a force in the direction from the center point C toward the seal portion is applied to each position of the seal portion. The force applied to each position of the seal portion increases as the distance from the center point C decreases. The distance from the first intermediate portion 35 to the center point C is the distance from the lower portion 32 of the first side seal portion 30 to the center point C and the distance from the lower portion 52 of the second side seal portion 50 to the center point shorter than the distance to C. Therefore, a larger force is applied to the inner edge 35 a of the first intermediate portion 35 , for example, the first connecting portion 38 than to the inner edge 32 a of the lower portion 32 and the inner edge 52 a of the lower portion 52 .

When force is applied to the first intermediate portion 35, peeling of the first intermediate portion 35 progresses. When the peeling of the first intermediate portion 35 reaches the first non-sealed portion 45, a flow path 35v is formed in the first intermediate portion 35 as shown in FIG. The steam generated in the housing portion 18 flows into the first unsealed portion 45 through the flow path 35v. In FIG. 24, an example of the peeled portion generated in the first intermediate portion 35 is indicated by a dotted line.

When the steam generated in the containing portion 18 is appropriately discharged to the outside of the pouch 10 through the flow path 35v and the first non-sealed portion 45, an increase in pressure in the containing portion 18 is suppressed. On the other hand, if the steam is not properly vented out of the pouch 10, the pressure in the container 18 will continue to increase. In this case, there is a risk that peeling may progress at seal portions other than the first intermediate portion 35 , such as the lower portion 32 of the first side seal portion 30 and the lower portion 52 of the second side seal portion 50 . In particular, when the output of the microwave oven is high, the rate of steam generation in the housing portion 18 is high, so peeling of the seal portions other than the first intermediate portion 35 is likely to occur. If the pressure in the container 18 exceeds a certain value, the pouch 10 may burst. A high output of a microwave oven is, for example, 800 W or more, may be 900 W or more, or may be 1000 W or more.

Here, in the present embodiment, a through portion 47 is provided inside the contour of the first non-seal portion 45 . Therefore, the steam that has flowed into the first non-sealed portion 45 is discharged to the outside not only through the opening edge portion 46 but also through the through portion 47 . As a result, an increase in the pressure of the accommodating portion 18 can be suppressed. Therefore, it is possible to suppress the occurrence of peeling at the seal portion other than the first intermediate portion 35 . In addition, bursting of the pouch 10 can be suppressed.

Further, in the present embodiment, the transition portion 373 of the second portion 37 of the first intermediate portion 35 is positioned above the upper edge 33c of the second intermediate portion 33 . Therefore, the distance L19 between the upper edge 33c of the second intermediate portion 33 and the transition portion 373 can be increased. As a result, the steam that has flowed into the first non-sealed portion 45 can smoothly reach the through portion 47 and the opening edge portion 46 . Therefore, an increase in the pressure of the housing portion 18 can be suppressed.

Further, in the present embodiment, the sealing portion of the pouch 10 has a hot seal strength of 10N or less. Thereby, the flow path 35v can be formed in the first intermediate portion 35 before the pressure in the accommodating portion 18 becomes excessively high. Therefore, it is possible to suppress the occurrence of peeling at the seal portion other than the first intermediate portion 35 . In addition, bursting of the pouch 10 can be suppressed.

Further, in the present embodiment, the through portion 47 is positioned above the upper edge 33 c of the second intermediate portion 33 of the first side seal portion 30 . Therefore, even if the contents 19 jumping upward enter the first non-sealed portion 45 , it is possible to prevent the contents 19 from reaching the through portion 47 . This can prevent the content 19 from leaking from the penetrating portion 47 .

As indicated by the dotted line in FIG. 24 , the progress of peeling of the first intermediate portion 35 in the second direction D2 may be stopped partway through the second portion 37 . For example, delamination progress may stop at the transition portion 373 of the second portion 37 . As a result, it is possible to prevent the content 19 from reaching the through portion 47 as compared with the case where the second portion 37 is completely peeled off.

In addition, when the contents include an ingredient having a grain shape such as minced meat, it is conceivable that the flow path 35v is blocked by scattering of the ingredients. When the channel 35v is blocked, the pressure in the containing portion 18 continues to increase.
Here, in the present embodiment, for example, the sealed portion of the pouch 10 has a hot seal strength of 10 N or less. Thereby, the width of the flow path 35v can be secured appropriately. Therefore, it is possible to prevent the channel 35v from being clogged with the contents 19 . Also, ingredients containing minced meat such as keema curry can be stored in the pouch 10 .

Further, in the present embodiment, since the first non-sealed portion 45 is widened to reach the first side edge 13x, it is easy to secure the area of the first non-sealed portion 45 . Therefore, the distance L15 in the first direction D1 between the first side edge 13x and the inner edge 35a of the first intermediate portion 35 can be reduced. Thereby, the distance from the center point C to the inner edge 35a of the first intermediate portion 35 can be increased. Therefore, it is possible to prevent a large force from being applied to the first intermediate portion 35 when the pouch 10 is subjected to a force due to impact such as dropping. Therefore, it is possible to prevent the first intermediate portion 35 from peeling off due to impact such as dropping.

After heating the content 19, the user tears the pouch 10 starting from the opening means 30a. The opening means 30a is arranged so as to overlap the lower second portion 371 of the first intermediate portion 35 when viewed along the first direction D1. Therefore, after heating the content 19, the first intermediate portion 35 overlapping the opening means 30a when viewed along the first direction D1 is peeled off. Therefore, the user can tear the pouch 10 without being hindered by the first intermediate portion 35 .

Various modifications can be made to the above-described embodiment. Modifications will be described below 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 portions in the above-described embodiment are used for the portions that can be configured in the same manner as in the above-described embodiment, Duplicate explanations are omitted. Further, when it is clear that the effects obtained in the above-described embodiment can also be obtained in the modified example, the explanation thereof may be omitted.

FIRST MODIFIED EXAMPLE FIG. 25 is a front view showing a modified example of the vapor release mechanism 25. As shown in FIG. As shown in FIG. 25 , the penetrating portion 47 may include a hole penetrating through the surface film 15 or the back film 16 . The hole profile may be circular. Although not shown, the perforation profile need not be circular. For example, the perforation profile may be elliptical. For example, the hole profile may be a polygon with chamfered corners.

Symbol S11 represents the dimension of the through portion 47 in the first direction D1. Reference S12 represents the dimension of the through portion 47 in the second direction D2. The dimension S11 and the dimension S12 are, for example, 5 mm or more, may be 6 mm or more, or may be 7 mm or more. As a result, steam can be appropriately discharged from the penetration portion 47 . The dimension S11 and the dimension S12 are, for example, 12 mm or less, may be 10 mm or less, or may be 8 mm or less. As a result, it is possible to prevent the contents 19 from leaking from the through portion 47 .

Second Modification FIG. 26 is a front view showing a modification of the vapor release mechanism 25. As shown in FIG. As shown in FIG. 26, the second portion 37 of the first intermediate portion 35 includes a lower second portion 371 and an upper second portion 372 having a greater width than the lower second portion 371. good too. The upper second portion 372 may include one end connected to the lower second portion 371 . The upper second portion 372 may include the other end connected to the upper seal portion 11a. The upper second portion 372 may include a portion whose width increases upward. In the example of FIG. 26, the upper second portion 372 can function as the separation suppressing portion 37R.

Third Modification FIG. 27 is a front view showing a modification of the vapor release mechanism 25. As shown in FIG. Symbol d21 represents the distance in the second direction D2 between the lower second portion 371 of the second portion 37 of the first intermediate portion 35 and the through portion 47 . The distance d21 is, for example, 1.0 mm or more, and may be 2.0 mm or more. The distance d21 is, for example, 5.0 mm or less, and may be 4.0 mm or less.

Fourth Modification FIG. 28 is a front view showing a modification of the vapor release mechanism 25. As shown in FIG. As shown in FIG. 28, the transition portion 373 of the second portion 37 of the first intermediate portion 35 has an inner edge 35a extending in a direction different from the inner edge 35a of the lower second portion 371 and an outer edge of the lower second portion 371. and an outer edge 35b extending in a different direction than 35b. The inner edge 35 a of the transition portion 373 may extend in a different direction than the inner edge 35 a of the upper second portion 372 . The outer edge 35 b of the transition portion 373 may extend in a different direction than the outer edge 35 b of the upper second portion 372 . In the example of FIG. 28, the transition portion 373 can function as the separation suppressing portion 37R.

As shown in FIG. 28 , the lower second portion 371 of the second portion 37 may be positioned below the second reference line SL2 and positioned below the upper edge 33c of the second intermediate portion 33 . You may have The transition portion 373 of the second portion 37 may be positioned below the second reference line SL2 and may be positioned below the upper edge 33c of the second intermediate portion 33 . As shown in FIG. 28, the upper edge 33c of the second intermediate portion 33 may be positioned above the second reference line SL2.

In FIG. 28, L24 represents the distance in the second direction D2 from the intermediate position of the through portion 47 to the upper edge of the first non-seal portion 45 in the second direction D2. In the example shown in FIG. 28, the distance L24 also corresponds to the distance in the second direction D2 from the intermediate position of the through portion 47 to the inner edge 11d of the upper seal portion 11a. The distance L24 is, for example, 3 mm or longer, may be 5 mm or longer, or may be 7 mm or longer. The distance L24 is, for example, 15 mm or less, may be 12 mm or less, or may be 10 mm or less.

The distance L24 may be determined in relation to the dimension L11 of the first non-sealed portion 45 in the second direction D2. The distance L24 is, for example, 0.08×L11 or more, may be 0.12×L11 or more, or may be 0.16×L11 or more. The distance L24 is, for example, 0.40×L11 or less, may be 0.35×L11 or less, or may be 0.30×L11 or less.

Second Embodiment Next, a second embodiment will be described. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding portions in the above-described embodiment are used for the portions that can be configured in the same manner as in the above-described embodiment, Duplicate explanations are omitted. Further, when it is clear that the effects obtained in the above-described embodiment can also be obtained in the second embodiment, the explanation thereof may be omitted.

FIG. 29 is a front view showing a vapor release mechanism 25 according to the second embodiment. As shown in FIG. 29, the second portion 37 of the first intermediate portion 35 has an outer edge 35b that extends linearly from the first connecting portion 38 to the upper edge of the first non-seal portion 45, and an inner edge that extends parallel to the outer edge 35b. 35a and .

In the present embodiment, the distance L16 means the distance from the inner edge 33a of the second intermediate portion 33 to the outer edge 35b of the second portion 37 in the first direction D1. The distance L17 means the distance in the first direction D1 from the opening edge portion 46 to the outer edge 35b of the second portion 37 at a position below the penetrating portion 47 . The distance L18 means the distance in the first direction D1 from the opening edge portion 46 to the outer edge 35b of the second portion 37 at a position above the penetrating portion 47. As shown in FIG.

Also in this embodiment, the through portion 47 is located above the upper edge 33c of the second intermediate portion 33 of the first side seal portion 30, as in the first embodiment. Therefore, even if the contents 19 jumping upward enter the first non-sealed portion 45 , it is possible to prevent the contents 19 from reaching the through portion 47 . This can prevent the content 19 from leaking from the penetrating portion 47 .

FIRST MODIFIED EXAMPLE FIG. 30 is a front view showing a modified example of the vapor release mechanism 25. FIG. As shown in FIG. 30 , the through portion 47 may include a hole penetrating through the surface film 15 or the back surface film 16 . The hole profile may be circular. Although not shown, the perforation profile need not be circular. For example, the perforation profile may be elliptical. For example, the hole profile may be a polygon with chamfered corners. As the range of dimensions of the penetrating portion 47, the same numerical range as in the case of the embodiment shown in FIG. 25 can be adopted.

Third Embodiment Next, a third embodiment will be described. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding portions in the above-described embodiment are used for the portions that can be configured in the same manner as in the above-described embodiment, Duplicate explanations are omitted. Further, when it is clear that the effects obtained in the above-described embodiments can also be obtained in the third embodiment, the description thereof may be omitted.

FIG. 31 is a front view showing a vapor release mechanism 25 according to the third embodiment. As shown in FIG. 31, the first side seal 30 may have an upper portion 31, a lower portion 32 and a first intermediate portion 35. As shown in FIG. Upper portion 31 extends along first side portion 13 from first unsealed portion 45 toward upper portion 11 . The upper portion 31 may be connected to the upper seal portion 11a. Lower portion 32 extends along first side 13 from first unsealed portion 45 toward lower portion 12 of pouch 10 . The first intermediate portion 35 is positioned between the housing portion 18 and the first non-seal portion 45 . First intermediate portion 35 may include a first end connected to upper portion 31 and a second end connected to lower portion 32 .

First intermediate portion 35 may include first portion 36 , second portion 37 , first connecting portion 38 , third portion 39 and second connecting portion 40 . The first connecting portion 38 connects the first portion 36 and the second portion 37 . The second connecting portion 40 connects the second portion 37 and the third portion 39 .

The second connecting portion 40 is positioned closer to the upper portion 31 . “Upper portion 31 side” means that the second connecting portion 40 is located closer to the upper portion 31 than the intermediate position of the first non-seal portion 45 in the second direction D2.

A third portion 39 extends from the second connecting portion 40 toward the first side portion 13 . For example, the inner edge 35a and the outer edge 35b of the third portion 39 extend toward the upper portion 31 substantially in the first direction D1. The angle between the direction in which the inner edge 35a and the outer edge 35b extend and the first direction D1 is, for example, 10° or less. The third portion 39 may be connected to the inner edge 31 a of the upper portion 31 . The outer edge 35 b of the third portion 39 may extend continuously with the lower edge 31 d of the upper portion 31 . For example, an extension line of the outer edge 35b of the third portion 39 may overlap the lower edge 31d of the upper portion 31 .

Also in this embodiment, the through portion 47 is located above the upper edge 33c of the second intermediate portion 33 of the first side seal portion 30, as in the first embodiment. Therefore, even if the contents 19 jumping upward enter the first non-sealed portion 45 , it is possible to prevent the contents 19 from reaching the through portion 47 . This can prevent the content 19 from leaking from the penetrating portion 47 .

Although not shown, the through portion 47 may include a hole penetrating through the surface film 15 or the back film 16 .

Fourth Embodiment Next, a fourth embodiment will be described. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding portions in the above-described embodiment are used for the portions that can be configured in the same manner as in the above-described embodiment, Duplicate explanations are omitted. Further, when it is clear that the effects obtained in the above-described embodiments can also be obtained in the fourth embodiment, the explanation thereof may be omitted.

FIG. 32 is a front view showing pouch 10 according to the fourth embodiment. As shown in FIG. 32, the pouch 10 may be a self-supporting gusseted pouch.

Pouch 10 may include a bottom film 17 located on bottom 12 in addition to top film 15 and back film 16 . The lower film 17 is arranged between the surface film 15 and the back film 16 while being folded back along the folding portion 17f, for example.

The lower portion 12 of pouch 10 includes a lower sealing portion 12a. The lower seal portion 12a includes a portion where the inner surface of the front film 15 and the inner surface of the lower film 17 are joined, and a portion where the inner surface of the back film 16 and the inner surface of the lower film 17 are joined.

Also in this embodiment, the first side seal portion 30 may include an upper portion 31 as in the above-described third embodiment shown in FIG. First intermediate portion 35 may include a first end connected to upper portion 31 and a second end connected to lower portion 32 .

Also in this embodiment, the through portion 47 is located above the upper edge 33c of the second intermediate portion 33 of the first side seal portion 30, as in the first embodiment. Therefore, even if the contents 19 jumping upward enter the first non-sealed portion 45 , it is possible to prevent the contents 19 from reaching the through portion 47 . This can prevent the content 19 from leaking from the penetrating portion 47 .

EXAMPLES Next, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the description of the Examples below as long as it does not exceed the gist thereof.

(Packaging material 1)
As the first biaxially oriented plastic film, a 12 μm-thick biaxially oriented PET film (product name “E5100” manufactured by Toyobo Co., Ltd.) was prepared. After that, a printed layer was formed on the inner surface of the first biaxially oriented plastic film. The thickness of the printed layer was 3.0 μm.

Also, a 12 μm-thick biaxially oriented PET film (product name “E5100” manufactured by Toyobo Co., Ltd.) was prepared as the second biaxially oriented plastic film. Subsequently, one surface of this film was subjected to a corona discharge treatment, and then a transparent deposited layer of silicon oxide having a thickness of 10 nm was formed. Subsequently, the transparent deposited layer was subjected to plasma treatment with a mixed gas of oxygen and argon, and then a coating liquid containing ethyl silicate and polyvinyl alcohol as main components was applied with a gravure roll coater to a thickness of 300 nm after drying. to form a transparent gas barrier coating film.

Also, as a sealant film, a 60 μm-thick unstretched polypropylene film (product name “ZK500” manufactured by Toray Advanced Film Co., Ltd.) was prepared.

Thereafter, a first biaxially stretched PET film, a printed layer, a first adhesive layer, a transparent barrier coating film, a transparent deposition layer, a second biaxially stretched PET film, a second adhesive layer, and an unstretched polypropylene film were sequentially laminated to prepare a packaging material. As the first adhesive layer and the second adhesive layer, a two-component polyurethane adhesive (main agent: RU-004, curing agent: H-1) manufactured by Rock Paint Co., Ltd. was used. The thickness of the first adhesive layer and the second adhesive layer was 3.0 μm. The packaging material thus obtained is also referred to as packaging material 1 .

(Packaging material 2)
Instead of a biaxially oriented PET film (product name “E5100”, manufactured by Toyobo Co., Ltd.) as the second biaxially oriented plastic film, a 15 μm thick biaxially oriented nylon film (product name “Bonyl W”, KOHJIN Film & Chemicals Co., Ltd.) was used in the same manner as for packaging material 1, to prepare a packaging material. The packaging material thus obtained is also referred to as packaging material 2 .

(Packaging material 3)
Instead of an unstretched polypropylene film (product name “ZK500”, manufactured by Toray Advanced Film Co., Ltd.) as a sealant film, an unstretched polypropylene film with a thickness of 60 μm (product name “ZK207”, manufactured by Toray Advanced Film Co., Ltd.) is used. A packaging material was produced in the same manner as for packaging material 2, except that the The packaging material thus obtained is also referred to as packaging material 3 .

(Packaging material 4)
As a biaxially oriented plastic film, a high-stiffness polyester film (hereinafter also referred to as a high-stiffness PET film) having a loop stiffness of 0.0017 N or more and containing 90% by mass or more of PET was prepared. Specifically, XP-55 manufactured by Toray Industries, Inc. was used as the high-stiffness PET film. The thickness of the high stiffness PET film was 16 μm.

Subsequently, one surface of the high-stiffness PET film was subjected to a corona discharge treatment, and then a transparent deposition layer, a transparent gas barrier coating film and a printed layer were formed in the same manner as in the packaging material 1 . Also, as a sealant film, a 60 μm-thick unstretched polypropylene film (product name “ZK500” manufactured by Toray Advanced Film Co., Ltd.) was prepared.

Thereafter, a high-stiffness PET film, a transparent deposition layer, a transparent barrier coating film, a printed layer, an adhesive layer, and an unstretched polypropylene film were sequentially laminated by a dry lamination method to prepare a packaging material. As the adhesive layer, a two-liquid type polyurethane adhesive (main agent: RU-004, curing agent: H-1) manufactured by Rock Paint Co., Ltd. was used. The thickness of the adhesive layer was 3.0 μm. The packaging material thus obtained is also referred to as packaging material 4 .

(Evaluation of packaging materials 1 to 4)
Pouch 10 of FIG. 1 was produced using packaging materials 1-4. The inside of the pouch 10 was filled with 200 ml of water. The conditions for heat sealing are as follows.
・ Heat sealing device: Heat sealer TP-701-A (manufactured by Tester Sangyo Co., Ltd.)
・Heat sealing temperature: 225°C
・Heat sealing pressure: 0.1 MPa
・Heat sealing time: 1 second

Subsequently, the pouch 10 was subjected to retort treatment under the following conditions.
・Method: Spray type ・Retort temperature: 121℃
・Retort time: 30 minutes

The dimensions of each part of the pouch 10 are as follows.
・Dimension H1 of housing portion 18: 110 mm
・Dimension H2 of housing portion 18: 159 mm
・Width of upper seal portion 11a, width of lower seal portion 12a: 8 mm
・Minimum and maximum values of the width W12 of the lower portion 32: 6 mm and 10 mm
・Minimum and maximum values of the width W22 of the lower portion 52: 6 mm and 10 mm

Using the test pieces 90A and 90B cut out from the pouch 10 composed of the packaging material 1 and the packaging material 2, the breaking strength (hot breaking strength) in the machine direction and vertical direction was measured. The measurement method and measurement conditions are the same as in the above embodiment. The results are shown in FIG.

Using test pieces 90A and 90B cut from the pouch 10 made of the packaging material 4, the Young's modulus in the machine direction and vertical direction was measured. The measurement method and measurement conditions are the same as in the above embodiment. The results are shown in FIG.

Using a test piece cut from the pouch 10 made of the packaging material 4, the puncture strength of the packaging material 4 was measured according to JIS Z1707 7.4. As a measuring instrument, a Tensilon universal material testing machine RTC-1310 manufactured by A&D was used. Specifically, a semicircular needle with a diameter of 1.0 mm and a tip shape radius of 0.5 mm was applied to the test piece of the packaging material 4 in a fixed state from the outer surface 70y side at 50 mm/min (1 minute 50 mm per). The maximum stress until the needle penetrates the packaging material 4 was measured. The maximum value of stress was measured for five or more test pieces, and the average value was defined as the puncture strength of the packaging material 4 . The environment during the measurement was a temperature of 23° C. and a relative humidity of 50%. The results are shown in FIG.

Hot seal strength was measured using a test piece 90C cut from the pouch 10 composed of the packaging materials 1 to 4. The measurement method and measurement conditions are the same as in the above embodiment. The results are shown in FIGS. 33 and 34. FIG.

(Example 1)
A content 1 was prepared as a content to be filled in the pouch 10 . Content 1 is 180 g of curry. FIG. 35 shows the results of analyzing the ingredients contained in the content 1. FIG.

In the analysis, first, the curry roux was removed from the contents using a sieve. The mesh of the strainer was 0.7 mm. Subsequently, ingredients contained in Contents 1 and 2 were observed using a microscope. As a microscope, VHX-6000 manufactured by Keyence was used. As a microscope lens, VH-ZST manufactured by Keyence was used. The observation magnification was 20 times.

The viscosity of the curry roux of content 1 was measured. The results are shown in FIG. As a viscosity measuring instrument, a digital viscometer DV-E manufactured by Eiko Seiki was used.

Using packaging material 1, pouch 10 of FIG. 1 was produced. The components of the venting mechanism 25 of the pouch 10 of FIG. 1 have the dimensions shown in FIG. Subsequently, the pouch 10 was filled with the content 1 described above. Subsequently, the lower portion 12 of the pouch 10 was heat-sealed to form a lower seal portion 12a. Thus, the pouch 10 shown in FIG. 4 containing the content 1 was obtained.

The dimensions of each part of the pouch 10 are as follows.
・Dimension H1 of housing portion 18: 110 mm
・Dimension H2 of housing portion 18: 159 mm
・Width of upper seal portion 11a, width of lower seal portion 12a: 8 mm
・Minimum and maximum values of the width W12 of the lower portion 32: 6 mm and 12 mm
・Minimum and maximum values of the width W22 of the lower portion 52: 6 mm and 12 mm
- The width of the first portion 36 of the first intermediate portion 35 and the lower second portion 371: 3 mm
・Width of upper second portion 372 of first intermediate portion 35: 6 mm
・Dimension L11 of the first non-sealed portion 45: 39 mm
・Dimension L12 of opening edge 46: 22 mm
・Dimension L13 of the second intermediate portion 33: 17 mm
・Maximum distance L15 between the first side edge 13x and the inner edge 35a of the first intermediate portion 35: 21 mm
・Distance L16 between the inner edge 33a of the second intermediate portion 33 and the outer edge 35b of the lower second portion 371: 12 mm
・Distance L17 between the opening edge portion 46 and the outer edge 35b of the lower second portion 371: 27 mm
・Distance L18 between the opening edge 46 and the outer edge 35b of the upper second portion 372: 15 mm
- Distance L19 between the transition portion 373 and the second intermediate portion 33: 15 mm
・Distance L21 from the lower edge of the first non-sealed portion 45 to the transition portion 373: 24.1 mm
・Distance L22 from the upper edge of the first non-sealed portion 45 to the transition portion 373: 10.3 mm
・Dimension L23 of the transition portion 373: 4.6 mm
・Distance L24 from the intermediate position of the penetrating portion 47 to the upper edge of the first non-sealing portion 45: 11 mm
・Diameter of penetration part 47: 6 mm

The conditions for heat sealing are as follows.
・ Heat sealing device: Heat sealer TP-701-A (manufactured by Tester Sangyo Co., Ltd.)
・Heat sealing temperature: 225°C
・Heat sealing pressure: 0.1 MPa
・Heat sealing time: 1 second

Subsequently, the pouch 10 was subjected to retort treatment under the following conditions.
・Method: Spray type ・Retort temperature: 121℃
・Retort time: 30 minutes

Subsequently, after wiping off moisture on the surface of the pouch 10, the pouch 10 was allowed to stand for one day. Pouches 10 were then placed in carton 100 .

Subsequently, the carton 100 was opened and placed in a microwave oven so that the pouch 10 was inclined at an angle θa with respect to the horizontal plane 120 as shown in FIG. The horizontal plane 120 is the interior lower surface of the range. The angle θa was 17°.

The pouch 10 containing the content 1 was heated in a microwave oven with an output of 1000 W for 125 seconds. As a microwave oven, Sharp RE-SX50 was used.

It was confirmed whether peeling occurred in the lower portion 32 or the lower portion 52 of each pouch 10 after heating. The results are shown in the column of "seal retraction" in FIG. In the column of "seal retraction", "great" indicates that the width of the peeling that occurred in the lower portion 32 or the lower portion 52 in the first direction D1 was less than 1 mm, or that peeling did not occur. means "Good" means that the width in the first direction D1 of the delamination occurring in the lower portion 32 or the lower portion 52 was 1 mm or more and less than 2 mm. "Not good" means that the width in the first direction D1 of the delamination occurring in the lower portion 32 or the lower portion 52 was 2 mm or more.

A peeled portion of the first intermediate portion 35 is indicated by a dotted line in FIG. As shown in FIG. 38 , the progress of delamination that occurred in the second portion 37 stopped at the transition portion 373 .

It was confirmed whether the contents were blowing out from the pouch 10 or not. The results are shown in the columns of "penetration part contamination", "box contamination", and "range contamination" in FIG. 37, respectively. The column of "Penetration Portion Contamination" indicates the result of confirmation as to whether or not the content adhered around the penetration portion 47. FIG. The column of "box contamination" indicates the result of confirmation as to whether or not the contents blown out from the pouch 10 adhered to the box. The column of "microwave contamination" shows the result of confirmation as to whether or not the contents blown out from the pouch 10 adhered to the microwave oven. "Great" means that almost no adhesion of the contents was confirmed. "Good" means that the amount of spillage of the contents was such that it could be wiped off with a single tissue. "not good" means that more than one tissue was required to wipe up the spilled contents.

(Example 2)
Using packaging material 1, pouch 10 of FIG. 28 was produced. The heat sealing conditions and retort treatment conditions are the same as in the first embodiment. The main dimensions that differ from those of Example 1 are shown below.
・Width of upper second portion 372 of first intermediate portion 35: 3 mm
・Dimension L12 of opening edge 46: 15 mm
・Dimension L13 of the second intermediate portion 33: 24 mm
・Distance L21 from the lower edge of the first non-sealed portion 45 to the transition portion 373: 15 mm
・Distance L22 from the upper edge of the first non-sealed portion 45 to the transition portion 373: 21 mm
・Dimension L23 of the transition portion 373: 3 mm
・Distance L24 from the intermediate position of the penetrating portion 47 to the upper edge of the first non-sealing portion 45: 7.5 mm

In the same manner as in Example 1, "seal retraction", "penetration part stain", "box stain", and "range stain" were evaluated. The results are shown in FIG. A peeled portion of the first intermediate portion 35 is indicated by a dotted line in FIG. As shown in FIG. 39 , the progress of delamination occurring in the second portion 37 stopped at the transition portion 373 .

(Example 3)
Using packaging material 1, pouch 10 of FIG. 29 was produced. The heat sealing conditions and retort treatment conditions are the same as in the first embodiment. The main dimensions that differ from those of Example 1 are shown below.
・Width of the second portion 37 of the first intermediate portion 35: 3 mm
・Dimension L12 of opening edge 46: 15 mm
・Dimension L13 of the second intermediate portion 33: 24 mm
・Distance L16 between the inner edge 33a of the second intermediate portion 33 and the outer edge 35b of the second portion 37: 12 mm
・Distance L18 between the opening edge 46 and the outer edge 35b of the second portion 37: 18 mm
・Distance L24 from the intermediate position of the penetrating portion 47 to the upper edge of the first non-sealing portion 45: 7.5 mm

In the same manner as in Example 1, "seal retraction", "penetration part stain", "box stain", and "range stain" were evaluated. The results are shown in FIG. A peeled portion of the first intermediate portion 35 is indicated by a dotted line in FIG. As shown in FIG. 40 , the progress of delamination occurring in the second portion 37 stopped in the middle of the second portion 37 .

(Example 4)
Using packaging material 1, pouch 10 of FIG. 30 was produced. The heat sealing conditions and retort treatment conditions are the same as in the first embodiment. The main dimensions that differ from those of Example 1 are shown below.
・Width of the second portion 37 of the first intermediate portion 35: 3 mm
・Dimension L12 of opening edge 46: 15 mm
・Dimension L13 of the second intermediate portion 33: 24 mm
・Distance L16 between the inner edge 33a of the second intermediate portion 33 and the outer edge 35b of the second portion 37: 12 mm
・Distance L18 between the opening edge 46 and the outer edge 35b of the second portion 37: 18 mm
・Distance L24 from the intermediate position of the penetrating portion 47 to the upper edge of the first non-sealing portion 45: 7.5 mm

In the same manner as in Example 1, "seal retraction", "penetration part stain", "box stain", and "range stain" were evaluated. The results are shown in FIG. A peeled portion of the first intermediate portion 35 is indicated by a dotted line in FIG. As shown in FIG. 41 , the progress of delamination occurring in the second portion 37 stopped halfway through the second portion 37 .

(Example 5)
Using packaging material 1, pouch 10 of FIG. 31 was produced. The heat sealing conditions and retort treatment conditions are the same as in the first embodiment. The main dimensions that differ from those of Example 1 are shown below.
・Width of the second portion 37 of the first intermediate portion 35: 3 mm
・Dimension L11 of the first non-sealed portion 45: 30 mm
・Dimension L12 of opening edge 46: 15 mm
・Dimension L13 of the second intermediate portion 33: 15 mm
・Distance L16 between the inner edge 33a of the second intermediate portion 33 and the outer edge 35b of the second portion 37: 12 mm
・Distance L18 between the opening edge 46 and the outer edge 35b of the second portion 37: 18 mm
・Distance L24 from the intermediate position of the penetrating portion 47 to the upper edge of the first non-sealing portion 45: 16.5 mm

In the same manner as in Example 1, "seal retraction", "penetration part stain", "box stain", and "range stain" were evaluated. The results are shown in FIG. A peeled portion of the first intermediate portion 35 is indicated by a dotted line in FIG. As shown in FIG. 42 , the progress of peeling occurring in the first intermediate portion 35 stopped at the second connecting portion 40 .

(Comparative example 1)
Using packaging material 1, pouch 10 was produced. The pouch of Comparative Example 1 does not have the penetrating portion 47 . Other configurations of the pouch of Comparative Example 1 are the same as those of the pouch 10 of Example 3. The heat sealing conditions and retort treatment conditions are the same as in the first embodiment.

In the same manner as in Example 1, "seal retraction", "penetration part stain", "box stain", and "range stain" were evaluated. The results are shown in FIG. A peeled portion of the first intermediate portion 35 is indicated by a dotted line in FIG. As shown in FIG. 43, the delamination that occurred in the second portion 37 progressed upward compared to the third embodiment.

10 Pouch 11 Upper part 11a Upper seal part 12 Lower part 12a Lower seal part 13 First side part 13x First side edge 14 Second side part 14x Second side edge 15 Surface film 16 Back film 17 Bottom film 18 Storage part 19 Contents 19a Upper surface 25 Steam vent mechanism 30 First side seal 31 Upper part 32 Lower part 33 Second intermediate part 33a Inner edge 33c Upper edge 35 First intermediate part 35a Inner edge 35b Outer edge 36 First part 37 Second part 371 Lower third Two parts 372 Upper second part 373 Transition part 38 First connecting part 39 Third part 40 Second connecting part 45 First non-sealed part 46 Opening edge 47 Penetrating part 50 Second side sealing part 51 Upper part 52 Lower side portion 55 intermediate portion 65 second unsealed portion 66 opening edge 70 packaging material 70x inner surface 70y outer surface 71 first biaxially oriented plastic film 72 second biaxially oriented plastic film 75 sealant film 76 first adhesive layer 77 second 2 Adhesive layer 81 Printed layer 82 Transparent deposition layer 83 Transparent gas barrier coating film

Claims (27)

A pouch in which a container for containing contents is defined between a front film and a back film,
a first side sealing portion located on a first side of the pouch and joining the inner surface of the front film and the inner surface of the back film;
a second side seal located on a second side of the pouch opposite in a first direction from the first side and defining the receptacle with the first side seal;
a first unsealed portion located near the top of the pouch and separated from the container by the first side seal, the first unsealed portion extending at least partially along a first side edge of the first side of the pouch; a first non-sealing portion that extends to reach the
a penetrating portion positioned inside the contour of the first non-sealed portion and penetrating at least one of the front film and the back film;
The first side sealing portion has a lower portion extending along the first side edge toward the lower portion of the pouch from the first unsealed portion, and between the accommodating portion and the first unsealed portion. a first intermediate portion located between and connected to the lower portion; and a second intermediate portion located between the first non-sealed portion and the first side edge and connected to the lower portion. , has
The pouch, wherein the penetrating portion is located above the second intermediate portion. the first intermediate portion includes a first portion, a second portion, and a first connection portion connecting the first portion and the second portion;
the first portion extends from the first connecting portion toward the first side of the pouch;
the second portion extends from the first connecting portion toward the top of the pouch;
The second portion comprises a lower second portion, an upper second portion positioned above the lower second portion, and a transition positioned between the lower second portion and the upper second portion. including the part and
2. The pouch of claim 1, wherein the transition portion includes an inner edge extending in a different direction than the inner edge of the lower second portion, or an outer edge extending in a different direction than the outer edge of the lower second portion. . 3. The pouch of Claim 2, wherein the upper second portion has a greater width than the lower second portion. the first intermediate portion includes a first portion, a second portion, and a first connection portion connecting the first portion and the second portion;
the first portion extends from the first connecting portion toward the first side of the pouch;
the second portion extends from the first connecting portion toward the top of the pouch;
2. The second portion includes a second lower portion and a second upper portion located above the second lower portion and having a width greater than that of the second lower portion. The pouch described in . The pouch according to any one of claims 2 to 4, wherein the through portion is located above the lower second portion. The pouch according to any one of claims 2 to 5, wherein the upper second portion is located above the second intermediate portion. The pouch according to any one of claims 2 to 6, wherein the through portion is positioned closer to the first side than the first portion of the first intermediate portion. an upper sealing portion located on the upper portion of the pouch and joining the inner surface of the front film and the inner surface of the back film;
A pouch according to any preceding claim, wherein the first intermediate portion is connected to an upper seal portion. the first side seal has an upper portion extending along the first side edge from the first unsealed portion toward the top of the pouch;
A pouch according to any preceding claim, wherein the first intermediate portion is connected to the upper portion of the first side seal. The pouch according to any one of claims 1 to 9, wherein the through portion is located above an intermediate position of the first unsealed portion in a second direction perpendicular to the first direction. A maximum distance (L15) in the first direction between the first side edge and the inner edge of the first intermediate portion is 24 mm or less, according to any one of the preceding claims. pouch. 12. The pouch according to claim 11, wherein the ratio of said maximum value (L15) to the dimension of said container in said first direction is 0.24 or less. The seal portion that joins the inner surface of the front film and the inner surface of the back film has a hot seal strength of 10 N or less,
Any one of claims 1 to 12, wherein the hot seal strength is the seal strength measured in an environment of 100°C after holding the test piece including the sealed portion in an environment of 100°C for 1 minute. 1. The pouch according to item 1. The packaging material constituting the front film and the back film comprises a first biaxially oriented plastic film, a second biaxially oriented plastic film, and a sealant film in this order,
A pouch according to any preceding claim, wherein there are only two biaxially oriented plastic films in the packaging material. 15. The packaging material according to claim 14, wherein the packaging material has a breaking strength of 33.0 MPa or more in one direction when measured in an environment of 100° C. after holding the packaging material in an environment of 100° C. for 1 minute. pouch. The first biaxially oriented plastic film is a biaxially oriented polyethylene terephthalate film,
16. The pouch according to claim 14 or 15, wherein said second biaxially oriented plastic film is a biaxially oriented polyethylene terephthalate film or a biaxially oriented nylon film. The packaging material further comprises a transparent vapor deposited layer positioned between the first biaxially oriented plastic film and the second biaxially oriented plastic film,
A pouch according to any one of claims 14 to 16, wherein said transparent deposited layer comprises a metal oxide or an inorganic oxide. The packaging material constituting the front film and the back film comprises a biaxially oriented plastic film and a sealant film in this order,
A pouch according to any preceding claim, wherein there is only one biaxially oriented plastic film in the packaging material. 19. The pouch of claim 18, wherein the packaging material has a Young's modulus in one direction of 3600 MPa or higher. The packaging material further comprises a transparent deposition layer provided on the surface of the biaxially stretched plastic film,
20. A pouch according to claim 18 or 19, wherein said transparent deposited layer comprises a metal oxide or an inorganic oxide. 21. The pouch according to claim 17 or 20, wherein said packaging material further comprises a transparent gas barrier coating film located on the surface of said transparent vapor deposited layer. The pouch of any one of claims 14-21, wherein the sealant film comprises a propylene-ethylene block copolymer and an elastomer. Contents including meat are accommodated in the accommodating portion of the pouch,
the pouch is heated in a microwave oven;
A pouch according to any one of claims 1-22. 24. The pouch of Claim 23, wherein said contents comprise 50 or more pieces of said meat having a dimension of 3 mm or greater. 25. A pouch according to claim 23 or 24, wherein the number of meats having a dimension of 3 mm or more divided by the weight of the content is 0.3 pieces/g or more. The content comprises an ingredient containing the meat and a viscous component,
The ratio of the weight of the ingredients to the weight of the contents is 8% or more,
The pouch according to any one of claims 23-25, wherein the ratio of the weight of the meat to the weight of the ingredients is 20% or more. Claims 23 to 26, wherein the distance between the upper surface of the contents and the first intermediate portion of the first side seal portion is 5 mm or more and 30 mm or less when the pouch is tilted 17° with respect to the horizontal plane. A pouch according to any one of the preceding paragraphs.

Images