JP2022152924A - pouch - Google Patents

Abstract

To provide a pouch capable of appropriately discharging steam generated in a storage part to the outside of the pouch.SOLUTION: A pouch comprises: a first side part seal portion positioned in a first side part of the pouch and connecting an inner surface of a front face film and an inner surface of a rear face film; a second side part seal portion positioned in a second side part facing the first side part of the pouch in a first direction, and defining a storage part between the first side part seal portion; a first non-seal portion positioned near an upper part of the pouch, separated from the storage part by the first side part seal portion, and expanding so as to reach a first side edge of the first side part of the pouch; and a through hole positioned inside an outline of the first non-seal portion, and penetrating at least one of the front face film and the rear face film. A ratio of an area of the through hole to an area of the first non-seal portion is 25% or more and 75% or less.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 vapor release mechanism is separated from the storage portion by the intermediate seal portion located between the upper side seal portion and the lower side seal portion of the pouch, and the intermediate seal portion, and a non-sealing portion that extends to reach the side edges of the. When the pressure in the containing portion increases, the intermediate seal portion is peeled off, and the containing 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 intermediate seal portion. Inadequate steam evacuation can result in pouch rupture or delamination of pouch side seals.

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 and extending to reach a first side edge of the first side of the pouch; a first unsealed portion;
a through hole positioned inside the contour of the first non-sealed portion and penetrating through at least one of the front film and the back film;
In the pouch, the ratio of the area of the through-hole to the area of the first unsealed portion is 25% or more and 75% or less.

In the pouch according to the present invention, the ratio of the area of the through-hole to the area of the first unsealed portion may be 50% or more.

In the pouch according to the present invention, the dimension of the through-hole may be 8 mm or more.

In the pouch according to the present invention, the first side sealing portion includes an upper sealing portion extending along the first side from the first unsealed portion toward the top of the pouch, and a lower seal portion extending along the first side toward the lower portion of the pouch; one end connected to the upper seal portion and the other end connected to the lower seal portion; and an intermediate seal portion positioned between the first unsealed portion, wherein the maximum value of the distance in the first direction between the inner edge of the lower seal portion and the inner edge of the intermediate seal portion ( L12) may be 15 mm or less.

In the pouch according to the present invention, a ratio of the maximum value (L12) to the dimension of the container in the first direction may be 0.10 or less.

In the pouch according to the present invention, a straight extension line connecting the center point of the accommodating portion and the first unsealed portion at the shortest distance may intersect the through hole.

In the pouch according to the present invention, 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, and the hot seal strength is a test piece including the seal portion may be the seal strength measured in an environment of 100°C after holding for 1 minute in an environment of 100°C.

In the pouch according to the present invention, the packaging material constituting the surface 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, and the packaging There may be only two biaxially oriented plastic films in the 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 is a biaxially oriented polyethylene terephthalate film, and the second biaxially oriented plastic film is a biaxially oriented polyethylene terephthalate film or a biaxially oriented nylon film. good too.

In the pouch according to the present invention, the packaging material further comprises a transparent vapor deposition layer positioned between the first biaxially oriented plastic film and the second biaxially oriented plastic film, wherein the transparent vapor deposition layer comprises metal oxide material or inorganic oxides.

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

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 include a transparent vapor deposition layer provided on the surface of the biaxially oriented plastic film, and the transparent vapor deposition 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 including meat is accommodated in the accommodating portion of the pouch, and the pouch may be heated in a microwave oven.

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

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

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

In the pouch according to the present invention, the first side sealing portion includes an upper sealing portion extending along the first side from the first unsealed portion toward the top of the pouch, and a lower seal portion extending along the first side toward the lower portion of the pouch; one end connected to the upper seal portion and the other end connected to the lower seal portion; and an intermediate sealed portion positioned between the first unsealed portion, and the distance between the upper surface of the contents and the intermediate sealed portion when the pouch is tilted 17° with respect to a horizontal plane. may be 5 mm or more and 30 mm or less.

According to the present invention, the steam generated in the container can be appropriately discharged to the outside of the pouch.

It is a front view which shows the pouch in embodiment of this invention. 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; Fig. 4 is a front view showing an enlarged intermediate sealed portion and first non-sealed portion of the first side sealed portion of the pouch; Fig. 4 is a front view showing an enlarged intermediate sealed portion and a second unsealed portion of the second side sealed portion of 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. 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. FIG. 4 is a plan view showing an example of a loop stiffness measuring device; FIG. 16 is a cross-sectional view of the loop stiffness measuring device of FIG. 15 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 intermediate|middle seal|sticker part of a 1st side seal|sticker part peels, and a accommodating part communicates with a 1st unsealed part. FIG. 11 is a front view showing a modification of the pouch; 23 is a front view showing an enlarged middle sealed portion and first unsealed portion of the first side seal portion of the pouch of FIG. 22; FIG. 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 result of the contents 1 and 2 of an Example. It is a figure which shows the result of the content 1 of an Example. It is a figure which shows the result of the contents 1 and 2 of an Example. FIG. 4 is a diagram showing evaluation results of pouches of Examples and Comparative Examples. FIG. 4 is a diagram showing evaluation results of pouches of Examples and Comparative Examples. FIG. 10 is a front view showing an intermediate sealed portion and a first unsealed portion of pouches of Comparative Examples 1 and 2; FIG. 11 is a front view showing an intermediate sealed portion and a first unsealed portion of a pouch of Comparative Example 6; 11 is a front view showing a pouch of Comparative Example 7; FIG.

An embodiment of the present invention will be described with reference to the drawings. In addition, in the drawings attached to this specification, for convenience of illustration and easy understanding, the scale, the ratio of length and width, etc. are appropriately changed and exaggerated from those of the real thing.

In addition, the terms such as "parallel", "perpendicular", "same" and the like, length and angle values, etc. that specify shapes and geometric conditions and their degrees used in this specification are strictly It is interpreted to include the extent to which similar functions can be expected without being bound by meaning.

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. Note that FIG. 1 shows the pouch 10 in a state in which no contents are stored. 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. It is merely a relative representation of the positions and orientations of the pouch 10 and its components in some cases. The orientation of pouch 10 is not limited by any names or terms 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 seal portion of pouch 10 includes a first side seal portion 30, a second side seal portion 35 and a top seal portion 11a. A first side seal 30 is located on the first side 13 of the pouch 10 . A second side seal 35 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 35 . The non-sealed portion surrounded by the first side seal portion 30, the second side seal portion 35, and the upper seal portion 11a functions as the accommodation portion 18 that accommodates 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 40 separated from the container portion 18 by a 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 40 is located near the upper portion 11 of the pouch 10 . “Upper 11 side” means that the first non-seal portion 40 is positioned closer to the upper portion 11 than the center point C of the accommodating portion 18 .

As shown in FIG. 1, the first unsealed portion 40 extends to reach the first side edge 13x of the first side portion 13 of the pouch 10. As shown in FIG. In other words, the first non-sealed portion 40 overlaps the first side edge 13x and has an opening edge 41 open to the outside. The steam generated in the housing portion 18 and flowed into the first unsealed portion 40 can be discharged to the outside through the opening edge portion 41 .

The first side sealing portion 30 is configured to define a first non-sealing portion 40 . For example, as shown in FIG. 1 , the first side seal portion 30 has an upper seal portion 31 , a lower seal portion 32 and an intermediate seal portion 33 . Upper sealed portion 31 extends along first side 13 from first unsealed portion 40 toward top 11 of pouch 10 . Lower sealed portion 32 extends along first side 13 from first unsealed portion 40 toward lower portion 12 of pouch 10 . The intermediate seal portion 33 is positioned between the housing portion 18 and the first non-seal portion 40 . The intermediate seal portion 33 includes one end connected to the upper seal portion 31 and the other end connected to the lower seal 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 containing portion 18 to increase the pressure of the containing portion 18 , the middle sealed portion 33 is partially peeled off and the containing portion 18 and the first non-sealed portion 40 communicate with each other. The steam that has flowed into the first unsealed portion 40 from the accommodating portion 18 can be discharged to the outside through the opening edge portion 41 . In this manner, the intermediate sealed portion 33 and the first non-sealed portion 40 function as a steam release mechanism for discharging the steam in the housing portion 18 to the outside.

As shown in FIG. 1, the pouch 10 further comprises a through hole 44 positioned inside the contour of the first unsealed portion 40 . The through holes 44 penetrate at least one of the surface film 15 and the back film 16 . For example, as shown in FIG. 2, the through holes 44 may penetrate both the surface film 15 and the back surface film 16 . The steam generated in the housing portion 18 and flowed into the first unsealed portion 40 can also be discharged to the outside through the through holes 44 .

FIG. 3 is a cross-sectional view showing another example of the pouch 10 when viewed along line AA of FIG. The through-holes 44 pass through the front film 15 but do not have to pass through the back film 16 . In other words, the through holes 44 are formed in the surface film 15 , but the through holes 44 may not be formed in the back film 16 .

An example of arrangement of the through holes 44 will be described based on the imaginary straight line M. FIG. The imaginary straight line M is a straight line that connects the center point C of the accommodating portion 18 and the first non-sealed portion 40 at the shortest distance, as shown in FIG. An extension line of the imaginary straight line M may intersect the through hole 44 . An extension line of the imaginary straight line M may intersect the opening edge 41 .

As shown in FIG. 1 , a second non-seal portion 45 may be formed between the second side edge 14 x of the second side portion 14 and the second side seal portion 35 . In this case, the second non-sealed portion 45 may widen to reach the second side edge 14x. In other words, the second non-seal portion 45 may have an opening edge portion 46 that overlaps the second side edge 14x and opens to the outside.

The second side seal portion 35 may have an upper seal portion 36 , a lower seal portion 37 and an intermediate seal portion 38 . Upper sealed portion 36 extends along second side 14 from second unsealed portion 45 toward top 11 of pouch 10 . Lower sealed portion 37 extends along second side 14 from second unsealed portion 45 toward lower portion 12 of pouch 10 . The intermediate seal portion 38 is positioned between the housing portion 18 and the second non-seal portion 45 . The intermediate seal portion 38 includes one end connected to the upper seal portion 36 and the other end connected to the lower seal portion 37 .

As shown in FIG. 1, the pouch 10 may be provided with an opening means 30a located in the upper sealing portion 31. 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 pouch 10 may include an opening means 35a located at the second side seal 35. As shown in FIG. The opening means 35a penetrates the surface film 15 and the back film 16. As shown in FIG. The opening means 35a is a notch, a cut, or the like. The opening means 35a, like the opening means 30a, can serve as a starting point for the user to tear the pouch 10 apart. The opening means 35a extends from the second side edge 14x toward the receiving portion 18. As shown in FIG. The opening means 35a may be formed in a portion of the second side seal portion 35 facing the upper seal portion 31 in the first direction D1. For example, the opening means 35a may be formed in the upper sealing portion 36. As shown in FIG.

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 perpendicular to the first direction D1.

Reference H3 represents the distance from the center point C to the intermediate seal portion 33 in the first direction D1. The distance H3 is the distance from the intersection of the imaginary straight line M and the inner edge 33a of the intermediate seal portion 33 to the center point C in the first direction D1. The distance H3 is, for example, 0.35×H1 or more, and may be 0.40×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 intermediate seal portion 33 in the second direction D2. A distance H4 is the distance from the intersection of the imaginary straight line M and the inner edge 33a of the intermediate seal portion 33 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 0.25×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.

As shown in Examples described later, the 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 hole 44 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. As a result, the upper surface 19 a of the content 19 can be prevented from contacting the intermediate seal portion 33 . 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 .

5, Lm represents the distance between the upper surface 19a of the content 19 and the intermediate seal portion 33. 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 33a of the intermediate seal portion 33 when the angle θa is 17°, then opening the pouch 10 and checking the position of the upper surface 19a.

The intermediate sealed portion 33 and the first non-sealed portion 40 will be described in detail. FIG. 6 is an enlarged front view showing the intermediate sealed portion 33 and the first non-sealed portion 40. As shown in FIG.

The intermediate seal portion 33 includes an inner edge 33a, which is an edge located on the housing portion 18 side, and an outer edge, which is an edge located on the first non-seal portion 40 side. The outer edge of the intermediate seal portion 33 defines the outline of the portion of the edge portion of the first non-seal portion 40 that is positioned closer to the housing portion 18 than the upper seal portion 31 or the lower seal portion 32 .

The inner edge 33 a includes a first inner edge 331 , a second inner edge 332 and a third inner edge 333 , an inner edge first connecting portion 336 connecting the first inner edge 331 and the second inner edge 332 , a second inner edge 332 and a third inner edge 333 . and an inner edge second connecting portion 337 that connects the .

The first inner edge 331 extends from the first inner edge connecting portion 336 toward the lower seal portion 32 . For example, the first inner edge 331 extends toward the lower seal portion 32 substantially in the first direction D1. The angle formed by the direction in which the first inner edge 331 extends and the first direction D1 is, for example, 10° or less. The first inner edge 331 may be connected to the inner edge 32a of the lower seal portion 32, as shown in FIG.

The second inner edge 332 extends from the inner edge first connecting portion 336 toward the upper portion 11 of the pouch 10 substantially in the second direction D2. The angle formed by the direction in which the second inner edge 332 extends and the second direction D2 is, for example, 10° or less.

The third inner edge 333 extends from the inner edge second connecting portion 337 toward the upper seal portion 31 side. For example, the third inner edge 333 extends toward the first upper seal portion 31 . The angle formed by the direction in which the third inner edge 333 extends and the first direction D1 is, for example, 30° or less. As shown in FIG. 6 , the third inner edge 333 may be connected to the inner edge 31 a of the upper sealing portion 31 .

As shown in FIG. 6, the direction in which the second inner edge 332 extends may be substantially orthogonal to the direction in which the first inner edge 331 extends. An angle θ1 between the direction in which the first inner edge 331 extends and the direction in which the second inner edge 332 extends is, for example, 85° or more and 95° or less.

The inner edge first connecting portion 336 is positioned closer to the lower seal portion 32 . “Closer to the lower seal portion 32” means that the first inner edge connecting portion 336 is positioned closer to the lower seal portion 32 than the center of the opening edge portion 41 in the second direction D2.

The inner edge second connecting portion 337 is located near the upper seal portion 31 . “Closer to the upper seal portion 31” means that the inner edge second connecting portion 337 is positioned closer to the upper seal portion 31 than the center of the opening edge portion 41 in the second direction D2.

In FIG. 6, L12 represents the maximum distance between the inner edge 32a of the lower seal portion 32 and the inner edge 33a of the intermediate seal portion 33 in the first direction D1. L12 is, for example, 5 mm or more, may be 7 mm or more, or may be 9 mm or more. L12 is, for example, 20 mm or less, may be 15 mm or less, or may be 12 mm or less. In the present embodiment, since the first non-sealed portion 40 spreads to reach the first side edge 13x, it is easy to secure the area of the first non-sealed portion 40 . Therefore, L12 can be reduced. Thereby, the distance from the center point C to the inner edge 33a of the intermediate seal portion 33 can be increased. Therefore, it is possible to prevent the intermediate seal portion 33 from peeling off when the pouch 10 is subjected to a force caused by an impact such as dropping. L12 is also referred to as the overhang dimension of the intermediate seal portion 33 .

L12/H1, which is the ratio of L12 to dimension H1 of the accommodating portion 18 in the first direction D1, is, for example, 0.04 or more, may be 0.05 or more, or may be 0.06 or more. L12/H1 is, for example, 0.12 or less, may be 0.10 or less, or may be 0.08 or less.

Next, the edge portion of the first non-seal portion 40 will be described. The edges of the first non-sealed portion 40 include an opening edge 41 positioned at the first side edge 13x of the first side portion 13, a lower edge of the upper sealed portion 31, an upper edge of the lower sealed portion 32, and an intermediate portion. and a seal side edge 43 defined by the outer edge of the seal portion 33 . As shown in FIG. 6, the edge portion 43 on the sealing portion side connects the first edge portion 431, the second edge portion 432 and the third edge portion 433, and the first edge portion 431 and the second edge portion 432. A first connecting portion 436 and a second connecting portion 437 connecting the second edge portion 432 and the third edge portion 433 may be included. The first connecting portion 436 faces the inner edge first connecting portion 336 , and the second connecting portion 437 faces the inner edge second connecting portion 337 . The first edge 431 corresponds to the first inner edge 331 . For example, first edge 431 extends at least partially parallel to first inner edge 331 . The second edge 432 corresponds to the second inner edge 332 . For example, second edge 432 extends at least partially parallel to second inner edge 332 . The third edge 433 may extend at least partially parallel to the third inner edge 333 .

The first non-seal portion 40 may extend to a position closer to the second side portion 14 than the inner edge 32 a of the lower seal portion 32 . In other words, part of the edge portion of the first non-seal portion 40 may be positioned closer to the second side portion 14 than the inner edge 32 a of the lower seal portion 32 . For example, the second edge 432 may be located closer to the second side 14 than the inner edge 32 a of the lower seal portion 32 . This makes it easier for steam to flow into the first unsealed portion 40 from the accommodating portion 18 .
Also, the first non-seal portion 40 may extend to a position closer to the second side portion 14 than the inner edge 31 a of the upper seal portion 31 . For example, the second edge 432 may be positioned closer to the second side 14 than the inner edge 31 a of the upper seal portion 31 .

The first edge portion 431 extends from the first connecting portion 436 toward the opening edge portion 41 side. For example, the first edge 431 extends substantially in the first direction D1 toward the opening edge 41 . The angle formed by the direction in which the first edge portion 431 extends and the first direction D1 is, for example, 10° or less. In the example shown in FIG. 6 , the first edge 431 extends linearly until it reaches the opening edge 41 .

The second edge portion 432 extends from the first connecting portion 436 toward the upper portion 11 of the pouch 10 substantially in the second direction D2. The angle formed by the direction in which the second edge portion 432 extends and the second direction D2 is, for example, 10° or less.

The third edge portion 433 extends from the second connecting portion 437 toward the opening edge portion 41 side. For example, the third edge 433 extends substantially in the first direction D1 toward the opening edge 41 . The angle formed by the direction in which the third edge portion 433 extends and the first direction D1 is, for example, 10° or less. In the example shown in FIG. 6 , the third edge 433 extends linearly until it reaches the opening edge 41 .

As shown in FIG. 6, the direction in which the second edge 432 extends may be substantially orthogonal to the direction in which the first edge 431 extends. An angle θ2 formed by the direction in which the first edge portion 431 extends and the direction in which the second edge portion 432 extends is, for example, 85° or more and 95° or less.

In FIG. 6, reference L11 represents the dimension of the opening edge 41 in the second direction D2. The dimension L11 is, for example, 4 mm or more, may be 10 mm or more, or may be 12 mm or more. The dimension L11 is, for example, 30 mm or less, may be 20 mm or less, or may be 18 mm or less.

Next, the through holes 44 are described. As shown in FIG. 6, the perforations 44 may have a circular profile. Although not shown, the contour of the through hole 44 need not be circular. For example, the perforation 44 may have an elliptical profile. For example, the contour of the through hole 44 may be a polygon with chamfered corners.

Symbol R1 represents the dimension of the through hole 44 in the first direction D1, and symbol R2 represents the dimension of the through hole 44 in the second direction D2. Dimension R1 and dimension R2 are, for example, 6 mm or more, and may be 7 mm or more. Thereby, the steam can be appropriately discharged from the through holes 44 . Dimension R1 and dimension R2 are, for example, 9 mm or less, and may be 8 mm or less. Thereby, it is possible to prevent the content 19 from leaking from the through hole 44 .

A symbol R3 represents a distance from the second edge 432 to the through hole 44 in the first direction D1. Reference R4 represents the distance from the first edge 431 to the through hole 44 in the second direction D2. A symbol R5 represents a distance from the opening edge 41 to the through hole 44 in the first direction D1. Symbol R6 represents the distance from the third edge 433 to the through hole 44 in the second direction D2. Dimension R3 and dimension R5 are, for example, 0.5 mm or more, and may be 1.0 mm or more. Dimension R3 and dimension R5 are, for example, 3.0 mm or less, and may be 2.5 mm or less. Dimension R4 and dimension R6 are, for example, 1.5 mm or more, and may be 2.0 mm or more. Dimension R4 and dimension R6 are, for example, 4.5 mm or less, and may be 4.0 mm or less.

The ratio of the area of the through hole 44 to the area of the first non-seal portion 40 is, for example, 30% or more, may be 40% or more, or may be 50% or more. As a result, a steam flow path from the first unsealed portion 40 to the outside of the pouch 10 via the through hole 44 can be appropriately secured. The ratio of the area of the through hole 44 to the area of the first non-sealed portion 40 is, for example, 85% or less, may be 80% or less, or may be 75% or less. This can prevent the content 19 from leaking out of the pouch 10 from the through hole 44 when the content 19 heated in the containing portion 18 scatters to the first unsealed portion 40 . The "area of the first non-sealed portion 40" is the area of the region surrounded by the outline of the first non-sealed portion 40 in plan view.

The area of the first non-seal portion 40 is, for example, 100 mm ² or more, may be 130 mm ² or more, or may be 150 mm ² or more. The area of the first non-seal portion 40 is, for example, 300 mm ² or less, may be 250 mm ² or less, or may be 200 mm ² or less.

Next, the dimensions of the first side seal portion 30 will be described.

In FIG. 6, symbols W11 and W12 represent the width of the upper sealing portion 31 and the width of the lower sealing portion 32, respectively. The width W11 and the width W12 are, for example, 4 mm or more, and may be 6 mm or more. The width W11 and the width W12 are, for example, 15 mm or less, and may be 10 mm or less.

In FIG. 6, symbols W13, W14 and W15 respectively indicate the width of the portion of the intermediate seal portion 33 extending along the first inner edge 331, the width of the portion of the intermediate sealing portion 33 extending along the second inner edge 332, and It represents the width of the portion of the intermediate seal portion 33 that extends along the third inner edge 333 . Preferably, the widths W13, W14 and W15 are less than the width W1 of the upper sealing portion 31 and the width W2 of the lower sealing portion 32. The width W13, the width W14, and the width W15 are, for example, 1 mm or more, and may be 2 mm or more. The width W13, the width W14, and the width W15 are, for example, 6 mm or less, and may be 5 mm or less. The width of each portion of the intermediate seal portion 33 is the dimension of the intermediate seal portion 33 in the direction orthogonal to the direction in which the inner edge of the intermediate seal portion 33 extends.

The intermediate sealed portion 38 and the second non-sealed portion 45 will be described in detail. FIG. 7 is an enlarged front view showing the intermediate sealed portion 38 and the second non-sealed portion 45. As shown in FIG.

The edge of the second non-sealed portion 45 includes the above-described opening edge 46 positioned on the second side edge 14x and the edge on the intermediate seal portion 38 side. The edge portion of the second non-seal portion 45 on the intermediate seal portion 38 side includes a first edge portion 481 , a second edge portion 482 and a third edge portion 483 . The first edge portion 481 and the third edge portion 483 extend from the opening edge portion 46 toward the accommodating portion 18 side. The first edge portion 481 may extend in the same direction as the first edge portion 431 of the first non-seal portion 40 . Also, the third edge portion 483 may extend in the same direction as the third edge portion 433 of the first non-seal portion 40 . The second edge portion 482 includes a lower end connected to the first edge portion 481 and an upper end connected to the third edge portion 483, and extends in the second direction D2. The second non-sealing portion 45 having such a shape is formed at the same time as the first non-sealing portion 40 by cutting one non-sealing portion, as disclosed in Japanese Unexamined Patent Application Publication No. 2016-74457. be. 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 40 and the other becomes the second non-sealing portion 45 . The second non-seal portion 45 may be positioned closer to the second side edge 14 x than the inner edge 37 a of the lower seal portion 37 .

In FIG. 7, symbols W21, W22 and W23 represent the width of the upper sealing portion 36, the lower sealing portion 37 and the middle sealing portion 38 respectively. In the example shown in FIG. 7, the width W21 of the upper sealing portion 36 is greater than the width W22 of the lower sealing portion 37 and the width W23 of the intermediate sealing portion 38. In the example shown in FIG.

Next, the layer structure of the packaging material 50 that constitutes the surface film 15 and the back film 16 will be described. FIG. 8 is a cross-sectional view showing an example of the layer structure of the packaging material 50. As shown in FIG.

The packaging material 50 shown in FIG. 8 comprises a first biaxially oriented plastic film 51, a first adhesive layer 56, a second biaxially oriented plastic film 52, a second adhesive layer 57 and a sealant film 55 in this order. At least prepare. The first biaxially stretched plastic film 51 is positioned on the outer surface 50y side, and the sealant film 55 is positioned on the inner surface 50x side opposite to the outer surface 50y. The inner surface 50x faces the accommodating portion 18 .

Each film comprising the packaging material 50, such as the first biaxially oriented plastic film 51, the second biaxially oriented plastic film 52, the sealant film 55, and the packaging material 50, 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 50 will now be described in detail.

(First biaxially stretched plastic film)
The first biaxially stretched plastic film 51 is a plastic film 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 stretched plastic film 51 functions as a base material layer for giving the packaging material 50 a predetermined strength. The stretching direction of the first biaxially stretched plastic film 51 is not particularly limited. For example, the first biaxially stretched plastic film 51 may be stretched in the first direction D1 and the second direction D2. The draw ratio of the first biaxially oriented plastic film 51 is, for example, 1.05 times or more.

The first biaxially stretched plastic film 51 contains, for example, polyester as a main component. For example, the first biaxially stretched plastic film 51 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). In addition, 51% by mass or more of polyester in the first biaxially stretched plastic film 51 may be composed of one type of polyester, or may be composed of two or more types of polyester. The polyester content in the first biaxially stretched plastic film 51 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 51 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 51 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 51 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 51 to 8 μm or more, the first biaxially stretched plastic film 51 has sufficient strength. By setting the thickness of the first biaxially stretched plastic film 51 to 30 μm or less, the first biaxially stretched plastic film 51 exhibits excellent moldability. Therefore, the process of processing the packaging material 50 to manufacture the pouch 10 can be carried out efficiently.

(First adhesive layer)
The first adhesive layer 56 contains an adhesive for bonding the first biaxially stretched plastic film 51 and the second biaxially stretched plastic film 52 by a dry lamination method. The adhesive constituting the first adhesive layer 56 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 56 is, for example, 2 μm or more, and may be 3 μm or more. The thickness of the first adhesive layer 56 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 52 is a plastic film stretched in two predetermined directions, like the first biaxially stretched plastic film 51 . Like the first biaxially oriented plastic film 51, the second biaxially oriented plastic film 52 also functions as a base material layer for giving the packaging material 50 a predetermined strength. Similarly to the case of the first biaxially stretched plastic film 51, the stretching direction of the second biaxially stretched plastic film 52 is not particularly limited. The draw ratio of the second biaxially oriented plastic film 52 is, for example, 1.05 times or more.

The second biaxially oriented plastic film 52 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 51 . The polyester content range in the second biaxially stretched plastic film 52 may be the same range as in the case of the first biaxially stretched plastic film 51 . The thickness of the second biaxially oriented plastic film 52 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 oriented plastic film 52 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 stretched plastic film 52 may contain polyamide as a main component. For example, the second biaxially oriented plastic film 52 may contain 51% by weight 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 52 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 oriented plastic film 52 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 52 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 57 contains an adhesive for adhering the second biaxially oriented plastic film 52 and the sealant film 55 by dry lamination. Examples of the adhesive for the second adhesive layer 57 include polyurethane, as in the case of the first adhesive layer 56 . In addition to the configuration, materials, and characteristics described below, the configuration, materials, and characteristics of the second adhesive layer 57 may be the same as those of the first adhesive layer 56 .

The thickness of the second adhesive layer 57 is, for example, 2 μm or more, and may be 3 μm or more. The thickness of the second adhesive layer 57 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 57 is in contact with the sealant film 55 . Therefore, when the second adhesive layer 57 contains an aromatic isocyanate compound, the components eluted from the aromatic isocyanate compound are prevented from adhering to the contents accommodated in the accommodation portion 18 in contact with the sealant film 55. There is

In consideration of such problems, preferably, the adhesive constituting the second adhesive layer 57 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 suppress the adhesion of ingredients that cannot be used for food due to the second adhesive layer 57 to the contents.

(sealant film)
Next, the sealant film 55 will be explained. The sealant film 55 may be a single layer or multiple layers. The sealant film 55 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 55 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 55 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 50 is subjected to high-temperature sterilization such as boiling or retorting. Therefore, the sealant film 55 used has heat resistance to withstand these high-temperature treatments.

The melting point of the material forming the sealant film 55 is preferably 150° C. or higher, more preferably 160° C. or higher. By increasing the melting point of the sealant film 55, the pouch 10 can be subjected to retort treatment at a high temperature, thereby shortening the time required for retort treatment. The melting point of the material forming the sealant film 55 is lower than the melting point of the resin forming the biaxially stretched plastic film.

The sealant film 55 contains propylene as a main component. For example, the sealant film 55 may contain 51% by mass or more of propylene. The propylene content in the sealant film 55 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 55 is a single layer film comprising a propylene-ethylene block copolymer. For example, the sealant film 55 is a single-layer unstretched film containing a propylene-ethylene block copolymer as a main component. By using the propylene/ethylene block copolymer, the impact resistance of the sealant film 55 can be enhanced, thereby suppressing the pouch 10 from breaking due to impact when dropped. In addition, the puncture resistance of the packaging material 50 can be enhanced.

In addition, by using the propylene/ethylene block copolymer, the strength of the sealing portion constituted by the sealant film 55 at a high temperature, for example, 100° C., that is, the hot seal strength described above, is reduced at a low temperature, for example, 23° C. °C (hereinafter also referred to as room-temperature seal strength). Since the hot seal strength is low, when the pouch 10 is heated using a microwave oven, the intermediate seal portion 33 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 50 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 55 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 55 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 55 . 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 55, 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 55, 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 55 . 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 55, the mechanical properties of the sealant film 55 can be adjusted.

The sealant film 55 may further contain a thermoplastic elastomer. By using a thermoplastic elastomer, the impact resistance and puncture resistance of the sealant film 55 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 55 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 55 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 55 is, for example, 100 μm or less, and may be 80 μm or less.

As the single-layer sealant film 55 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 55 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 55 in the machine direction (MD) at 23° C. 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 55 in the machine direction (MD) and the thickness (μm) of the sealant film 55 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 55 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 55 and the thickness (μm) of the sealant film 55 in the vertical direction (TD) may be 53000 or more, or 60000 or more. Since the sealant film 55 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 55 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 55 and the thickness (μm) of the sealant film 55 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 55 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 55 and the thickness (μm) of the sealant film 55 in the vertical direction (TD) is, for example, 30000 or less, and may be 25000 or less.

The packaging material 50 may further comprise a printed layer 61 as shown in FIG. The printed layer 61 is a layer provided on the packaging material 50 in order to display product information on the packaging material 50 and to give it an aesthetic appearance. The print layer 61 is provided, for example, on the first biaxially stretched plastic film 51 . The print layer 61 expresses characters, numbers, symbols, graphics, patterns, and the like. The print layer 61 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.

9A and 9B are cross-sectional views showing other examples of the layer structure of the packaging material 50. FIG. As shown in FIGS. 9A and 9B, the packaging material 50 may comprise a transparent vapor deposited layer 62 positioned between the first biaxially oriented plastic film 51 and the second biaxially oriented plastic film 52 . The packaging material 50 may have a transparent gas barrier coating 63 positioned on the surface of the transparent deposition layer 62 . As shown in FIG. 9A, a transparent deposition layer 62 may be provided on the inner surface of the first biaxially oriented plastic film 51 . As shown in FIG. 9B, a transparent deposited layer 62 may be provided on the outer surface of the second biaxially oriented plastic film 52 .

[Transparent deposition layer]
The transparent vapor deposition layer 62 may consist of a single vapor deposition layer, or may include two or more vapor deposition layers. The transparent deposited layer 62 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 62 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 62 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 62 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 62 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 63 has transparency. The transparent gas barrier coating film 63 can suppress permeation of oxygen gas and water vapor. The transparent gas barrier coating film 63 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 63 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 63 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 8, 9A and 9B, the packaging material 50 may contain only two biaxially oriented plastic films. A specific example of the packaging material 50 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 50 are described when the packaging material 50 contains only two biaxially oriented plastic films. Specifically, preferred hot breaking strength and hot sealing strength of the packaging material 50 will be described.

The packaging material 50 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 50 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 orthogonal to one direction of the packaging material 50 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 50 is preferably 50.0 MPa or less, and the hot breaking strength of the packaging material 50 in a direction perpendicular to the one direction is 45.0 MPa or less. is preferred. The one direction of the packaging material 50 may be, for example, the first direction D1 in the pouch 10, and the direction orthogonal to the one direction of the packaging material 50 may be, for example, the second direction D2 in the pouch 10. Also, for example, the flow direction (MD) of the packaging material 50 may correspond to the first direction D1 of the pouch 10, and the vertical direction (TD) of the packaging material 50 may correspond to the second direction D2 of the pouch 10, for example. . Further, for example, one direction of the packaging material 50 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 50 is used to measure the characteristics of the packaging material 50 . If packaging material 50 is available prior to packaging material 50 being processed into pouch 10 , test strips may be made by cutting packaging material 50 . A test strip may be made by cutting a product made from packaging material 50 , such as pouch 10 . FIG. 11 shows an example of a method of preparing test strips 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 50 in the flow direction, the front 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 flow direction, as indicated by reference numeral 80A in FIG. to prepare a test piece. When measuring the properties of the packaging material 50 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 80B in FIG. to prepare a test piece.

The measurement of the hot breaking strength of the packaging material 50 is performed according to JIS K7127 except for the length of the test pieces 80A and 80B. The length and width of test pieces 80A and 80B 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 the test pieces 80A and 80B. Specifically, first, as shown in FIG. 12, gripping tools 81 and 82 grip both ends of the test pieces 80A and 80B in the longitudinal direction. Then, after holding the test pieces 80A and 80B for 1 minute in an environment with a temperature of 100° C. and a relative humidity of 5%, the initial distance S1 between the grippers (see FIG. 12) 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 80A and 80B in the longitudinal direction of the test pieces 80A and 80B at a tensile speed of 300 mm/min in a state of 50 mm, and the hot breaking strength of the test pieces 80A and 80B is measured. The hot breaking strength is measured for the five test pieces 80A and 80B, and the average value is taken as the hot breaking strength in the flow direction and vertical direction of the packaging material 50 .

The packaging material 50 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 intermediate seal portion 33 will peel off before the contents are sufficiently heated and pressurized, and the pressure and temperature of the container 18 will drop. Considering this point, the hot seal strength of the sealed portion of the packaging material 50 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 50 may also change due to sterilization treatment such as retort treatment. It means the seal strength of the seal part in the packaging material 50 of the pouch after being applied.

In measuring the hot seal strength of the packaging material 50, a test piece cut out from the packaging material 50 whose inner surfaces are bonded together is used. If the packaging material 50 is available prior to the packaging material 50 being processed into the pouch 10, test strips may be made by cutting the packaging material 50 with the inner surfaces joined together. A test strip may be made by cutting a product made from packaging material 50 , such as pouch 10 . FIG. 13 shows 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 35 to prepare the test piece 80C. The length and width of the test piece 80C 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 50 at the non-sealed portion of the test piece 80C are respectively gripped by grippers 83 and 84 (see FIG. 14A) of the testing machine. Then, each of the gripping tools 83 and 84 is pulled at a speed of 300 mm/min in opposite directions in the direction orthogonal to the surface direction of the seal portion of the test piece 80C, and the maximum value MAX of the tensile stress F1 is measured ( See Figure 14B). The spacing S2 between the grippers 83, 84 at the start of pulling is 50 mm and the spacing S2 between the grippers 83, 84 at the start of pulling is 60 mm. Let the maximum value MAX be the seal strength (see FIG. 14B). The hot seal strength is measured by holding the test piece 80C in an environment of 100° C. and 5% relative humidity for 1 minute and then in an environment of 100° C. and 5% relative humidity. The hot seal strength of five test pieces 80</b>C is measured, and the average value is taken as the hot seal strength of the packaging material 50 .

The thickness of the packaging material 50 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 50 containing only two biaxially stretched plastic films is, for example, 130 μm or less, and may be 120 μm or less.

FIG. 10 is a cross-sectional view showing another example of the layer structure of the packaging material 50. As shown in FIG. The packaging material 50 shown in FIG. 10 comprises a biaxially oriented plastic film 53, an adhesive layer 58 and a sealant film 55 in this order. The biaxially stretched plastic film 53 is positioned on the outer surface 50y side, and the sealant film 55 is positioned on the inner surface 50x side. The inner surface 50x faces the accommodating portion 18 . There is only one biaxially oriented plastic film in the packaging material 50 . The packaging material 50 may comprise a transparent vapor deposited layer 62 provided on the surface of the biaxially oriented plastic film 53 . The packaging material 50 may have a transparent gas barrier coating 63 positioned on the surface of the transparent deposition layer 62 .

The biaxially stretched plastic film 53 is a plastic film stretched in two predetermined directions, like the first biaxially stretched plastic film 51 . As the biaxially stretched plastic film 53, the biaxially stretched plastic film described in the first biaxially stretched plastic film 51 may be used.

As the biaxially stretched plastic film 53, 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 50 allows the packaging material 50 to have excellent puncture strength even with only one biaxially oriented plastic film in the packaging material 50 . 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. 15 to 20. 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 50, that includes multiple films that are laminated together.

15 is a plan view showing the test piece 80 and the loop stiffness measuring device 85, and FIG. 16 is a cross-sectional view of the test piece 80 and the loop stiffness measuring device 85 of FIG. 15 along line C-C. The test piece 80 is a rectangular film having long sides and short sides. In the present application, the length S3 of the long side of the test piece 80 was set to 150 mm, and the length S4 of the short side was set to 15 mm. As the loop stiffness measuring device 85, 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 80 can be adjusted as long as the test piece 80 can be gripped by a pair of chuck portions 86, which will be described later.

The loop stiffness measuring instrument 85 has a pair of chuck portions 86 for gripping a pair of longitudinal ends of the test piece 80 and a support member 87 supporting the chuck portions 86 . The chuck part 86 includes a first chuck 861 and a second chuck 862 . 15 and 16, the test strip 80 is placed on the pair of first chucks 861, and the second chuck 862 still grips the test strip 80 between itself and the first chucks 861. not As will be described later, the test piece 80 is gripped between a first chuck 861 and a second chuck 862 of the chuck portion 86 during measurement. The second chuck 862 may be connected to the first chuck 861 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 80 can be obtained by cutting the film to be measured. may be made. Test strips 80 may also be made by cutting a packaged product made from packaging material 50, such as a pouch. When measuring the loop stiffness of the packaging material 50 in the machine direction, a test piece 80A shown in FIG. 11 can be used. When measuring the loop stiffness of the packaging material 50 in the vertical direction, a test piece 80B shown in FIG. 11 can be used.

A method of measuring the loop stiffness of the test piece 80 using the loop stiffness measuring device 85 will be described. First, as shown in FIGS. 15 and 16, the test piece 80 is placed on the first chuck 861 of the pair of chuck portions 86 that are spaced apart by an interval S5. In the present application, the interval S5 is set so that the length of the loop portion 801 described later (hereinafter also referred to as loop length) is 60 mm. The test piece 80 includes an inner surface 80x positioned on the side of the first chuck 861 and an outer surface 80y positioned on the opposite side of the inner surface 80x. When test strip 80 is made of packaging material 50 , inner surface 80 x and outer surface 80 y of test strip 80 match inner surface 50 x and outer surface 50 y of packaging material 50 . When the loop portion 801 to be described later is formed in the test piece 80 , the inner surface 80 x is positioned inside the loop portion 801 and the outer surface 80 y is positioned outside the loop portion 801 . Subsequently, as shown in FIG. 17 , the second chuck 862 is placed on the test piece 80 so as to grip the ends of the test piece 80 in the longitudinal direction between the first chuck 861 and the first chuck 861 .

Subsequently, as shown in FIG. 18, at least one of the pair of chuck portions 86 is slid on the support member 87 in the direction in which the distance between the pair of chuck portions 86 is reduced. Thereby, the loop portion 801 can be formed in the test piece 80 . A test piece 80 shown in FIG. 18 has a loop portion 801 , a pair of intermediate portions 802 and a pair of fixing portions 803 . A pair of fixed portions 803 are portions of the test piece 80 that are held by a pair of chuck portions 86 . The pair of intermediate portions 802 are portions of the test strip 80 located between the loop portion 801 and the pair of intermediate portions 802 . As shown in FIG. 18, the chuck portion 86 is slid on the support member 87 until the inner surfaces 80x of the pair of intermediate portions 802 come into contact with each other. Thereby, a loop portion 801 having a loop length of 60 mm can be formed. The loop length of the loop portion 801 is the position Q1 where the surface of the second chuck 862 on the loop portion 801 side and the test piece 80 intersect, and the surface of the other second chuck 862 on the loop portion 801 side and the test piece 80. is the length of the test piece 80 between the crossing position Q2. When ignoring the thickness of the test piece 80, the above-mentioned interval S5 is a value obtained by adding 2×t to the length of the loop portion 801. As shown in FIG. t is the thickness of the second chuck 862 of the chuck portion 86 .

After that, as shown in FIG. 19, the posture of the chuck portion 86 is adjusted so that the projection direction Y of the loop portion 801 with respect to the chuck portion 86 is horizontal. For example, the posture of the chuck portion 86 supported by the support member 87 is adjusted by moving the support member 87 so that the normal direction of the support member 87 faces the horizontal direction. In the example shown in FIG. 19, the projecting direction Y of the loop portion 801 coincides with the thickness direction of the chuck portion. Also, the load cell 88 is prepared at a position separated from the second chuck 862 by a distance Z1 in the projecting direction Y of the loop portion 801 . In this application, the distance Z1 is set to 50 mm. Subsequently, the load cell 88 is moved at a speed V toward the loop portion 801 of the test piece 80 by a distance Z2 shown in FIG. The distance Z2 is set so that the load cell 88 contacts the loop portion 801 and then the load cell 88 pushes the loop portion 801 toward the chuck portion 86 side. In this application, the distance Z2 is set to 40 mm. In this case, the distance Z3 between the load cell 88 and the second chuck 862 of the chuck portion 86 when the load cell 88 pushes the loop portion 801 toward the chuck portion 86 is 10 mm. A speed V for moving the load cell 88 was set to 3.3 mm/sec.

Subsequently, in the state shown in FIG. 20 where the load cell 88 is pushing the loop portion 801 of the test piece 80, after the value of the load applied from the loop portion 801 to the load cell 88 stabilizes, 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 80 . 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 53, the puncture strength of the biaxially stretched plastic film 53 can be increased. As a result, the puncture strength of the packaging material 50 including the biaxially stretched plastic film 53 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 50 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 50, 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 50 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 50, 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 50, the packaging material 50 and packaged products such as the pouch 10 made of the packaging material 50 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 50 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 50 can be increased by including the high-stiffness polyester film in the packaging material 50 . The Young's modulus of the packaging material 50 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 50 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 50 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 50 makes it difficult for the packaging material 50 to stretch. For this reason, the processing precision when processing the packaging material 50 in the manufacturing process of the packaging product such as the pouch 10 is increased. In addition, when the packaging material 50 is used to manufacture a gusseted pouch 10 configured to be able to stand on its own, as will be described later, the self-standing of the pouch 10 is enhanced. The Young's modulus of the packaging material 50 in the vertical direction (TD) may be higher than the Young's modulus of the packaging material 50 in the machine direction (MD).

A high stiffness polyester film may be used as the first biaxially oriented plastic film 51 or the second biaxially oriented plastic film 52 shown in FIGS. 8, 9A and 9B.

A packaging material 50 containing only one biaxially oriented plastic film may have a hot seal strength comparable to a packaging material 50 containing only two biaxially oriented plastic films. The packaging material 50 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 sealed portion of the packaging material 50 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 58 contains an adhesive for adhering the biaxially oriented plastic film 53 and the sealant film 55 by dry lamination. As in the case of the first adhesive layer 56, an example of the adhesive for the adhesive layer 58 is polyurethane or the like. In addition to the configuration, materials, and characteristics described below, the configuration, materials, and characteristics of the adhesive layer 58 may be the same as those of the first adhesive layer 56 .

The thickness of the adhesive layer 58 is, for example, 2 μm or more, and may be 3 μm or more. The thickness of the adhesive layer 58 is, for example, 6 μm or less, and may be 5 μm or less.

The thickness of the packaging material 50 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 50 containing only one biaxially stretched plastic film is, for example, 110 μm or less, and may be 100 μm or less.

Pouch Production Method Next, a method for producing the pouch 10 using the packaging material 50 described above will be described. First, the surface film 15 and the back film 16 made of the packaging material 50 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 35, 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. Also, a through hole 44 is formed in the first non-sealed portion 40 . Thereby, the pouch 10 shown in FIG. 1 can be obtained. The through holes 44 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 of the lower portion 12 . Thereafter, the upper portion 11 is heat-sealed along the upper edge 11x to form the upper seal portion 11a. 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 middle seal portion 33 to the center point C is less than the distance from the lower seal portion 32 to the center point C and the distance from the lower seal portion 37 to the center point C. Therefore, a larger force is applied to, for example, the inner edge first connecting portion 336 of the intermediate seal portion 33 than to the inner edge 32 a of the lower seal portion 32 and the inner edge 37 a of the lower seal portion 37 .

When a force is applied to the intermediate seal portion 33, peeling of the intermediate seal portion 33 progresses. When the intermediate seal portion 33 is peeled off, a flow path 33v is formed in the intermediate seal portion 33 as shown in FIG. The steam generated in the housing portion 18 flows into the first unsealed portion 40 through the flow path 33v.

When the steam generated in the containing portion 18 is appropriately discharged to the outside of the pouch 10 through the flow path 33v and the first non-sealed portion 40, 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 possibility that the peeling progresses also in the seal portions other than the intermediate seal portion 33, such as the lower seal portion 32 and the lower seal portion 37. In particular, when the output of the microwave oven is high, the rate of steam generation in the accommodating portion 18 is high, so peeling is likely to occur at the seal portions other than the intermediate seal portion 33 . 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 hole 44 is provided inside the outline of the first non-seal portion 40 . Therefore, the steam that has flowed into the first non-sealed portion 40 is discharged to the outside not only through the opening edge portion 41 but also through the through holes 44 . 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 portions other than the intermediate seal portion 33 . In addition, bursting of the pouch 10 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 33v can be formed in the intermediate seal portion 33 before the pressure in the accommodating portion 18 becomes excessively high. Therefore, it is possible to suppress the occurrence of peeling at the seal portions other than the intermediate seal portion 33 . In addition, bursting of the pouch 10 can be suppressed.

Further, in the present embodiment, the ratio of the area of through-hole 44 to the area of first non-seal portion 40 is 85% or less. This can prevent the content 19 from leaking out of the pouch 10 from the through hole 44 when the content 19 heated in the containing portion 18 scatters to the first unsealed portion 40 . Moreover, since the ratio of the area of the through-holes 44 to the area of the first non-sealed portion 40 is 30% or more, steam can be appropriately discharged to the outside of the pouch 10 through the through-holes 44 .

In addition, when the contents include ingredients having the shape of grains such as minced meat, it is conceivable that the flow path 33v is blocked by scattering of the ingredients. When the channel 33v 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 33v can be secured appropriately. Therefore, it is possible to prevent the channel 33v 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 unsealed portion 40 spreads to reach the first side edge 13x, the area of the first unsealed portion 40 can be easily secured. Therefore, the distance L12 in the first direction D1 between the inner edge 32a of the lower seal portion 32 and the inner edge 33a of the intermediate seal portion 33 can be reduced. Thereby, the distance from the center point C to the inner edge 33a of the intermediate seal portion 33 can be increased. Therefore, it is possible to prevent a large force from being applied to the intermediate seal portion 33 when the pouch 10 is subjected to a force caused by an impact such as dropping. Therefore, it is possible to prevent the intermediate seal portion 33 from peeling off due to impact such as dropping.

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 Modification FIG. 22 is a front view showing a modification of the pouch 10. FIG. FIG. 23 is a front view showing an enlarged middle seal portion 33 and first unsealed portion 40 of the first side seal portion 30 of the pouch 10 of FIG.

As shown in FIG. 23 , the second inner edge 332 may extend from the inner edge first connecting portion 336 so as to be at least partially displaced toward the first side portion 13 toward the upper portion 11 of the pouch 10 . An angle θ1 between the direction in which the first inner edge 331 extends and the direction in which the second inner edge 332 extends is smaller than 90°. The angle θ1 is, for example, 85° or less, may be 80° or less, or may be 75° or less. The angle θ1 is, for example, 30° or more, may be 40° or more, or may be 50° or more.

As shown in FIG. 23 , the second edge 432 may extend from the first connecting portion 436 toward the upper portion 11 of the pouch 10 so as to be at least partially displaced toward the first side portion 13 . The angle θ2 between the direction in which the first edge 431 extends and the direction in which the second edge 432 extends is smaller than 90°. The angle θ2 is, for example, 85° or less, may be 80° or less, or may be 75° or less. The angle θ2 is, for example, 30° or more, may be 40° or more, or may be 50° or more.

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: 118 mm
・Dimension H2 of housing portion 18: 159 mm
・Width of upper seal portion 11a, width of lower seal portion 12a: 8 mm
・Width W12 of lower seal portion 32, width W22 of lower seal portion 37: 6 mm

Using the test pieces 80A and 80B 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 80A and 80B 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 50y 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 80C 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. 24 and 25. FIG.

(Example 1)
Contents 1 and 2 were prepared as contents to be filled in the pouch 10 . Content 1 is 150 g of keema curry. Content 2 is 180 g of curry. FIG. 26 shows the analysis results of the ingredients contained in the content 1 and the content 2. 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 size and number of meat contained in content 1 were analyzed in detail. The results are shown in FIG.

The viscosities of the curry roux of contents 1 and 2 were 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. Subsequently, pouch 10 was filled with content 1 or 2 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 or 2 was obtained. Specifically, two pouches 10 containing content 1 and two pouches 10 containing content 2 were produced.

The dimensions of each part of the pouch 10 are as follows.
・Dimension H1 of housing portion 18: 118 mm
・Dimension H2 of housing portion 18: 159 mm
・Width of upper seal portion 11a, width of lower seal portion 12a: 8 mm
・Width W12 of lower seal portion 32, width W22 of lower seal portion 37: 6 mm
・Width W11 of upper seal portion 31, width W36 of upper seal portion 36: 10 mm
: Width W13, W14, W15 of intermediate seal portion 33: 3 mm
・Overhang dimension L12 of intermediate seal portion 33: 9 mm
・Length L11 of opening edge 41: 15 mm
・Dimensions R1 and R2 of through hole 44: 8 mm (circular)
・Distance R3 from through-hole 44 to second edge 432: 2.0 mm
・Distance R4 from through-hole 44 to first edge 431: 3.5 mm
・Distance R5 from through-hole 44 to opening edge 41: 2.0 mm
・Distance R6 from through-hole 44 to third edge 433: 3.5 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 600 W for 3 minutes. Also, the pouch 10 containing the content 2 was heated in a microwave oven with an output of 600 W for 3 minutes. Also, the pouch 10 containing the content 1 was heated in a microwave oven with an output of 1000 W for 5 minutes. Also, the pouch 10 containing the content 2 was heated in a microwave oven with an output of 1000 W for 5 minutes. As a microwave oven, NE-1801 manufactured by Panasonic was used.

The vapor permeability of each pouch 10 after heating was evaluated. The results are shown in the "Vaporability" column of FIG. In the column of "Vaporability", "great" means that the channel 33v was not clogged with the ingredients of the contents and that the pouch 10 did not burst. "Not good" means that the flow path 33v was clogged with the contents, and the pouch 10 was ruptured.
The lowest "Vaporability" evaluation results for each pouch 10 are listed in FIG. In Example 1, all the evaluation results of the "vaporability" of each pouch 10 were "great", so "great" is described in FIG. If the "vapor-permeability" evaluation results of a plurality of pouches 10 include "great" and "not good", "not good" is described in FIG.

It was confirmed whether peeling occurred in the lower seal portion 32 or the lower seal portion 37 of each pouch 10 after heating. The results are shown in the "seal retraction" column of FIG. In the column of "seal retraction", "great" indicates that the width of peeling that occurred in the lower seal portion 32 or the lower seal portion 37 in the first direction D1 was less than 1 mm, or that peeling did not occur. means that "Good" means that the width in the first direction D1 of the delamination occurring in the lower seal portion 32 or the lower seal portion 37 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 seal portion 32 or the lower seal portion 37 was 2 mm or more.
The lowest "seal retreat" rating for each pouch 10 is listed in FIG. In Example 1, the evaluation results of "seal retraction" of each pouch 10 were all "great", so "great" is described in FIG. If the evaluation results of "seal retraction" of a plurality of pouches 10 include "great" and "not good", "not good" is described in FIG.

It was confirmed whether the contents were blowing out from the pouch 10 heated for 3 minutes in a microwave oven with an output of 600 W. The results are shown in the "balloon" column in FIG. In the column "spilling", "great" means that there was no spillage of the contents on the bottom, sides or top of the microwave oven. "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.

Moreover, the drop test of the pouch 10 was performed. First, using the packaging material 1, the pouch 10 of FIG. 1 was produced. Pouch 10 was then filled with 180 g of water. 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 water was obtained. Subsequently, the pouch 10 was subjected to retort treatment under the following conditions. The dimensions of each part of the pouch 10, the conditions for heat sealing, and the conditions for retort treatment are the same as those of the pouch 10 filled with the content 1 or the content 2 described above.

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

Subsequently, the carton 100 containing the pouches 10 was dropped from a height of 1.2 m. At this time, the orientation of the carton 100 was determined such that the front surface or the back surface of the carton 100 faces downward. The front and back surfaces of the carton 100 face the top film 15 and back film 16 of the pouch 10 .

Subsequently, the carton 100 containing the pouches 10 was dropped from a height of 1.2 m. At this time, the orientation of the carton 100 was determined so that the side surface of the carton 100 faced downward. The side of the carton 100 faces either the first side 13 or the second side 14 of the pouch 10 .

After that, it was confirmed whether or not the pouch 10 had ruptured. Such a drop test was performed on ten pouches 10 . The results are shown in the "Drop strength" column of FIG. In the "Drop Strength" column, "great" means that none of the ten pouches 10 burst. "good" means that only 1 out of 10 pouches 10 burst. "not good" means that 2 or more out of 10 pouches 10 burst.

(Example 2)
Using packaging material 1, pouch 10 of FIG. 1 was produced. The heat sealing conditions and retort treatment conditions are the same as in the first embodiment. The dimensions of each part of the pouch 10 are the same as in Example 1, except for the following points.
・Dimensions R1 and R2 of through hole 44: 9 mm (circular)
・Distance R3 from through-hole 44 to second edge 432: 1.5 mm
・Distance R4 from through-hole 44 to first edge 431: 3.0 mm
・Distance R5 from through-hole 44 to opening edge 41: 1.5 mm
・Distance R6 from through-hole 44 to third edge 433: 3.0 mm

As in Example 1, "Vaporability", "Seal Retraction", "Blowout" and "Drop Strength" were evaluated. The results are shown in FIGS. 29 and 30. FIG.

(Example 3)
Using packaging material 4, pouch 10 of FIG. 1 was produced. The heat sealing conditions and retort treatment conditions are the same as in the first embodiment. The dimensions of each part of the pouch 10 are the same as those of the first embodiment.

As in Example 1, "Vaporability", "Seal Retraction", "Blowout" and "Drop Strength" were evaluated. The results are shown in FIGS. 29 and 30. FIG.

(Example 4)
Using packaging material 2, pouch 10 of FIG. 1 was produced. The heat sealing conditions and retort treatment conditions are the same as in the first embodiment. The dimensions of each part of the pouch 10 are the same as those of the first embodiment.

As in Example 1, "Vaporability", "Seal Retraction", "Blowout" and "Drop Strength" were evaluated. The results are shown in FIG.

(Example 5)
Using packaging material 1, pouch 10 of FIG. 1 was produced. The heat sealing conditions and retort treatment conditions are the same as in the first embodiment. The dimensions of each part of the pouch 10 are the same as in Example 1, except for the following points.
・Dimensions R1 and R2 of through hole 44: 6 mm (circular)
・Distance R3 from through-hole 44 to second edge 432: 3.0 mm
・Distance R4 from through-hole 44 to first edge 431: 4.5 mm
・Distance R5 from through-hole 44 to opening edge 41: 3.0 mm
・Distance R6 from through-hole 44 to third edge 433: 4.5 mm

As in Example 1, "Vaporability", "Seal Retraction", "Blowout" and "Drop Strength" were evaluated. The results are shown in FIG.

(Comparative example 1)
Packaging material 3 was used to prepare a pouch 10 having a first side seal portion 30 and a first non-seal portion 40 as shown in FIG. The first unsealed portion 40 of FIG. 31 is the same as the pouch 10 of FIG. 1 except that the through hole 44 is not formed. The heat sealing conditions and retort treatment conditions are the same as in the first embodiment. The dimensions of the containing portion 18, the sealed portion, and the first non-sealed portion 40 of the pouch 10 of Comparative Example 1 are the same as those of the first embodiment.

As in Example 1, "Vaporability", "Seal Retraction", "Blowout" and "Drop Strength" were evaluated. The results are shown in FIGS. 29 and 30. FIG.

(Comparative example 2)
Using the packaging material 1, similarly to the case of Comparative Example 1, a pouch 10 having a first side seal portion 30 and a first non-seal portion 40 shown in FIG. 31 was produced. The heat sealing conditions and retort treatment conditions are the same as in the first embodiment. The dimensions of each part of the pouch 10 are the same as in Comparative Example 1.

As in Example 1, "Vaporability", "Seal Retraction", "Blowout" and "Drop Strength" were evaluated. The results are shown in FIGS. 29 and 30. FIG.

(Comparative Example 3)
Using packaging material 3, pouch 10 of FIG. 1 was produced. The heat sealing conditions and retort treatment conditions are the same as in the first embodiment. The dimensions of each part of the pouch 10 are the same as those of the first embodiment.

As in Example 1, "Vaporability", "Seal Retraction", "Blowout" and "Drop Strength" were evaluated. The results are shown in FIGS. 29 and 30. FIG.

(Comparative Example 4)
Using packaging material 1, pouch 10 of FIG. 1 was produced. The heat sealing conditions and retort treatment conditions are the same as in the first embodiment. The dimensions of each part of the pouch 10 are the same as in Example 1, except for the following points.
・Dimensions R1 and R2 of the through hole 44: 10 mm (circular)
・Distance R3 from through-hole 44 to second edge 432: 1.0 mm
・Distance R4 from through-hole 44 to first edge 431: 2.5 mm
・Distance R5 from through-hole 44 to opening edge 41: 1.0 mm
・Distance R6 from through-hole 44 to third edge 433: 2.5 mm

As in Example 1, "Vaporability", "Seal Retraction", "Blowout" and "Drop Strength" were evaluated. The results are shown in FIG.

(Comparative Example 5)
Using packaging material 1, pouch 10 of FIG. 1 was produced. The heat sealing conditions and retort treatment conditions are the same as in the first embodiment. The dimensions of each part of the pouch 10 are the same as in Example 1, except for the following points.
・Dimensions R1 and R2 of the through hole 44: 4 mm (circular)
・Distance R3 from through hole 44 to second edge 432: 4.0 mm
・Distance R4 from through-hole 44 to first edge 431: 5.5 mm
・Distance R5 from through-hole 44 to opening edge 41: 4.0 mm
・Distance R6 from through-hole 44 to third edge 433: 5.5 mm

As in Example 1, "Vaporability", "Seal Retraction", "Blowout" and "Drop Strength" were evaluated. The results are shown in FIG.

(Comparative Example 6)
Packaging material 1 was used to prepare a pouch 10 having a first side seal portion 30 and a first non-seal portion 40 as shown in FIG. The first unsealed portion 40 of FIG. 32 is the same as the pouch 10 of FIG. 1 except that slits 144 are formed instead of through holes 44 . The slit 144 extends in the first direction D1. The length of slit 144 is 6.3 mm. The heat sealing conditions and retort treatment conditions are the same as in the first embodiment. The dimensions of the containing portion 18, the sealed portion, and the first non-sealed portion 40 of the pouch 10 of Comparative Example 6 are the same as those of Example 1.

As in Example 1, "Vaporability", "Seal Retraction", "Blowout" and "Drop Strength" were evaluated. The results are shown in FIG.

(Comparative Example 7)
Using packaging material 1, pouch 10 shown in FIG. 33 was produced. The first unsealed portion 40 of the pouch 10 of FIG. 33 differs from the pouch 10 of FIG. 1 in that it does not reach the first side edge 13x. In this case, in order to secure the area of the first unsealed portion 40, the first unsealed portion 40 and the intermediate sealed portion 33 need to expand inward compared to the pouch 10 of FIG. As a result, the overhang dimension L12 of the intermediate seal portion 33 increases.

The heat sealing conditions and retort treatment conditions are the same as in the first embodiment. The dimensions of each part of the pouch 10 are as follows.
・Dimension H1 of housing portion 18: 118 mm
・Dimension H2 of housing portion 18: 159 mm
・Width of upper seal portion 11a, width of lower seal portion 12a: 8 mm
・Width W12 of lower seal portion 32, width W22 of lower seal portion 37: 6 mm
・Width W11 of upper seal portion 31, width W36 of upper seal portion 36: 10 mm
: Width of intermediate seal portion 33: 3 mm
・Overhang dimension L12 of intermediate seal portion 33: 17 mm
・Dimension of through hole 44: 6 mm (circular)

As in Example 1, "Vaporability", "Seal Retraction", "Blowout" and "Drop Strength" were evaluated. The results are shown in FIG.

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 18 Storage part 19 Contents 19a Upper surface 30 1 side seal portion 31 upper seal portion 31a inner edge 32 lower seal portion 32a inner edge 33 intermediate seal portion 33a inner edge 331 first inner edge 332 second inner edge 333 third inner edge 336 inner edge first connecting portion 337 inner edge second connecting portion 35 2 Side seal portion 36 Upper seal portion 36a Inner edge 37 Lower seal portion 37a Inner edge 38 Intermediate seal portion 38a Inner edge 40 First non-seal portion 41 Opening edge 43 Seal portion side edge 431 First edge 432 Second edge Part 433 Third edge 436 First connecting part 437 Second connecting part 44 Through hole 45 Second non-sealed part 46 Opening edge 481 First edge 482 Second edge 483 Third edge 50 Packaging material 50x Inner surface 50y Outer surface 51 First biaxially oriented plastic film 52 Second biaxially oriented plastic film 55 Sealant film 56 First adhesive layer 57 Second adhesive layer 61 Printed layer 62 Transparent deposition layer 63 Transparent gas barrier coating film

Claims (21)

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 and extending to reach a first side edge of the first side of the pouch; a first unsealed portion;
a through hole positioned inside the contour of the first non-sealed portion and penetrating through at least one of the front film and the back film;
The pouch, wherein the ratio of the area of the through hole to the area of the first unsealed portion is 25% or more and 75% or less. 2. The pouch according to claim 1, wherein the ratio of the area of said through-hole to the area of said first unsealed portion is 50% or more. 3. The pouch according to claim 1 or 2, wherein the through-hole has a dimension of 8 mm or more. The first side sealing portion includes an upper sealing portion extending along the first side from the first unsealed portion toward the top of the pouch and an upper sealing portion extending along the first side from the first unsealed portion toward the bottom of the pouch. a lower seal portion extending along the first side portion and having one end connected to the upper seal portion and the other end connected to the lower seal portion, the accommodating portion and the first non-seal portion and an intermediate seal portion located between
4. A maximum distance (L12) in the first direction between the inner edge of the lower sealing portion and the inner edge of the intermediate sealing portion is 15 mm or less. pouch. 5. The pouch according to claim 4, wherein the ratio of said maximum value (L12) to the dimension of said container in said first direction is 0.10 or less. 6. The pouch according to any one of claims 1 to 5, wherein an extension of a straight line connecting the center point of said accommodating portion and said first unsealed portion at the shortest distance intersects said through hole. 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,
7. The hot seal strength is the seal strength measured in an environment of 100° C. after holding the test piece including the seal 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,
8. Pouch according to any one of the preceding claims, wherein there are only two biaxially oriented plastic films in the packaging material. 9. The packaging material according to claim 8, 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,
10. The pouch according to claim 8 or 9, 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,
11. The pouch of any one of claims 8-10, wherein the 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,
8. Pouch according to any one of the preceding claims, wherein there is only one biaxially oriented plastic film in the packaging material. 13. The pouch of claim 12, 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,
14. The pouch according to claim 12 or 13, wherein the transparent deposited layer comprises metal oxides or inorganic oxides. 15. The pouch according to claim 11 or 14, wherein the packaging material further comprises a transparent gas barrier coating film located on the surface of the transparent deposition layer. 16. The pouch of any one of claims 8-15, 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;
17. The pouch of any one of claims 1-16. 18. The pouch of Claim 17, wherein said contents comprise 50 or more pieces of said meat having a dimension of 3 mm or greater. 19. A pouch according to claim 17 or 18, 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,
20. The pouch according to any one of claims 17 to 19, wherein the ratio of the weight of the meat to the weight of the ingredients is 20% or more. The first side sealing portion includes an upper sealing portion extending along the first side from the first unsealed portion toward the top of the pouch and an upper sealing portion extending along the first side from the first unsealed portion toward the bottom of the pouch. a lower seal portion extending along the first side portion and having one end connected to the upper seal portion and the other end connected to the lower seal portion, the accommodating portion and the first non-seal portion and an intermediate seal portion located between
21. The method according to any one of claims 17 to 20, wherein the distance between the upper surface of the contents and the intermediate seal portion is 5 mm or more and 30 mm or less when the pouch is tilted 17° with respect to the horizontal plane. pouch.

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