Pouches and packaging materials

Abstract

To provide pouches and packaging materials that can enhance appearance and suppress the occurrence of pinholes. [Solution] According to one aspect of the present invention, a pouch 10 is provided in which the packaging material comprises a first biaxially oriented plastic film, a second biaxially oriented plastic film, and a sealant film in this order, wherein the first biaxially oriented plastic film is mainly composed of polyester, the second biaxially oriented plastic film is mainly composed of polyamide, and the sealant film is mainly composed of polypropylene, and there are only two biaxially oriented plastic films in the packaging material, the Young's modulus of the packaging material in one direction and in a direction perpendicular to that direction is 3000 MPa or more when measured in an environment of 25°C, and the puncture strength of the packaging material is 15.0 N or more when measured in an environment of 25°C.

Description

[Technical Field]

[0001] This invention relates to pouches and packaging materials. [Background technology]

[0002] Conventionally, cooked or partially cooked liquids, viscous substances, or mixtures of liquids and solids were used. Many products on the market are filled and sealed in pouches made of plastic packaging material. It is rotating. In pouches, the non-sealed portion where the packaging materials are not joined together contains the contents. It constitutes a storage section in which the packaging materials are contained, and the sealing section in which the packaging materials are joined together is The container is sealed (see, for example, Patent Document 1). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Patent No. 6157767 [Overview of the project] [Problems that the invention aims to solve]

[0004] Currently, in the case of pouches, there is a demand to improve the appearance of the pouch in order to increase purchasing intent. However, if the Young's modulus of the packaging material that makes up the pouch is small, heating Sterilization (boiling) or heat-pressure sterilization (retort processing) can cause wrinkles in the pouch. This may cause rot, potentially impairing the appearance of the pouch.

[0005] Also, vibrations during transport can cause the surface of the cardboard box and the pouch to rub against each other, or the pouch itself may get damaged. When the corners of our pouch rub against each other, pinholes can occur in the packaging material that makes up the pouch. There is a risk that if a pinhole develops in the pouch, the shelf life of the contents may be compromised. Therefore, it is necessary to suppress the occurrence of pinholes.

[0006] This invention was made to solve the above problem, namely, to improve appearance. To provide pouches and packaging materials that can do so and suppress the occurrence of pinholes. The objective. [Means for solving the problem]

[0007] This invention includes the following inventions. [1] A pouch comprising packaging material and having a storage space, wherein the packaging material is a first A biaxially oriented plastic film, a second biaxially oriented plastic film, and a sealant. The first biaxially oriented plastic film is made of polyester in this order. The second biaxially oriented plastic film is mainly composed of polyamide, The sealant film mainly consists of polypropylene, and the packaging material contains biaxially oriented polypropylene The plastic film consists of only two sheets, and the packaging material is held in a 25°C environment for 1 minute. Afterward, the Young's curve was measured in one direction and in the direction perpendicular to the said direction when measured in an environment of 25°C. The ratios are 3000 MPa or higher, and the packaging material is maintained at 25°C for 1 minute. After holding it, the puncture strength measured in a 25°C environment is 15.0N or higher. My place.

[0008] [2] The product of the tensile elongation (%) and thickness (μm) of the sealant film in the aforementioned unidirectional direction is , a pouch as described in [1] above, having a value between 30,000 and 50,000.

[0009] [3] The product of the tensile elongation (%) and the thickness (μm) in the direction orthogonal to the one direction of the sealant film is 45,000 or more and 55,000 or less, and the pouch according to the above [1] or [2].

[0010] [4] The sealant film contains a propylene-ethylene block copolymer, and the pouch according to any one of the above [1] to [3].

[0011] [5] The first biaxially stretched plastic film is a biaxially stretched polyethylene terephthalate film, and the second biaxially stretched plastic film is a biaxially stretched nylon film, and the pouch according to any one of the above [1] to [4].

[0012] [6] A packaging material comprising a first biaxially stretched plastic film, a second biaxially stretched plastic film, and a sealant film in this order, wherein the first biaxially stretched plastic film is mainly composed of polyester, the second biaxially stretched plastic film is mainly composed of polyamide, the sealant film is mainly composed of polypropylene, there are only two biaxially stretched plastic films in the packaging material, and the Young's modulus in one direction when measured in an environment of 25 °C is 3100 MPa or more, and the puncture strength when measured in an environment of 25 °C is 15.0 N or more.

[0013] [7] The product of the tensile elongation (%) and the thickness (μm) in the direction orthogonal to the one direction of the sealant film is 30,000 or more and 50,000 or less, and the packaging material according to the above [6].

[0014] [8] The tensile elongation (%) and the thickness in the direction orthogonal to the one direction of the sealant film The packaging described in [6] or [7] above, wherein the product of (μm) is 45,000 or more and 55,000 or less. packaging material.

[0015] [9] The sealant film comprises a propylene-ethylene block copolymer, as described above [ Packaging materials as described in any one of paragraphs 6 through 8.

[0016]

[10] The first biaxially oriented plastic film is biaxially oriented polyethylene terephthalate The film is a film, and the second biaxially oriented plastic film is a biaxially oriented nylon film. The packaging material described in any one of the above paragraphs [6] through [9].

[0017]

[11] A pouch comprising the packaging material described in any one of the above items [6] through

[10] .

[0018]

[12] The pouch according to any one of the above items [1] to [5],

[0011] , wherein the contents are contained in the containment space of the pouch. [Effects of the Invention]

[0019] According to the present invention, it is possible to improve the appearance and suppress the occurrence of pinholes in the powder. We can provide chips and packaging materials. [Brief explanation of the drawing]

[0020] [Figure 1] Figure 1 is a front view of the pouch according to the embodiment. [Figure 2] Figure 2 is a diagram illustrating the dimensions of each component of the pouch shown in Figure 1. [Figure 3] Figure 3 is a cross-sectional view of the packaging material according to the embodiment. [Figure 4] Figure 4 shows how a test specimen for measuring the Young's modulus of the packaging material is cut from the front surface of the pouch. [Figure 5]Figure 5 shows how a test specimen for measuring the Young's modulus of the packaging material is cut from the back of the pouch. [Figure 6] Figure 6 shows how Young's modulus is measured using a test specimen. [Figure 7] Figure 7 shows how to cut a test specimen from the front of a pouch to measure the puncture strength of the packaging material. [Figure 8] Figure 8 shows how to cut out a test specimen from the back of a pouch to measure the puncture strength of the packaging material. [Figure 9] Figure 9 shows how puncture strength is measured using a test specimen. [Modes for carrying out the invention]

[0021] The following describes pouches and packaging materials according to embodiments of the present invention with reference to the drawings. To clarify, in this specification, terms such as "film" and "sheet" are used only in different forms. Therefore, they are not distinguishable from each other. For example, "film" is a sheet. The term is used to include components that are also called [another term]. Figure 1 shows the correct position of the pouch according to this embodiment. Figure 2 is a view drawing, and Figure 2 is a diagram illustrating the dimensions of each component of the pouch shown in Figure 1. Figure 3 is a cross-sectional view of the packaging material according to this embodiment. Figure 4 shows the Young's modulus of the packaging material. Figure 5 shows the process of cutting out a test piece for measurement from the front of the pouch, and the packaging material Figure 6 shows how to cut out a test piece from the back of the pouch to measure the Young's modulus of the material. This figure shows how to measure Young's modulus using a test specimen. Figure 7 shows the impact of punctures in packaging material. Figure 8 shows how to cut out a test piece from the front surface of the pouch to measure its strength. A diagram showing how to cut out a test piece from the back of a pouch to measure the puncture strength of the packaging material. Figure 9 shows how puncture strength is measured using a test specimen.

[0022] <<<Pouch>>> The pouch 10 shown in Figure 1 is a standing type pouch that contains contents It has a containment space 10A. The contents are not particularly limited, but may be solids, liquids, and These include mixtures of these. The contents may include, for example, curry, stew, soup, etc. Cooked foods are one example. Cooked foods undergo heat sterilization processes such as boiling and retort processing. It may be processed in such a way that the contents include heat-sterilized food or pressure-heat-sterilized food. It may be acceptable. "Retort processing" means filling the contents into a pouch and sealing the pouch. This process involves heating the pouch under pressure using steam or heated hot water. The processing temperature is, for example, 120°C or higher. The pouch is in an unfilled state. This concept includes not only pouches themselves, but also pouches that are already filled with contents.

[0023] The pouch 10 shown in Figure 1 consists of a front film 11, a back film 12, and a bottom film. It has a film 13. The front film 11 and the back film 12 have a rectangular contour. It has the following characteristics. In the state shown in Figure 1, the bottom film 13 is folded in half. It is.

[0024] Pouch 10 consists of an upper part 10B, a bottom part 10C opposite to the upper part 10B, and the upper part 10B and bottom part 1 It has a first side portion 10D and a second side portion 10E extending between 0C. This is the side opposite to the first side 10D. Also, in this specification, "upper" and "lower" The "side" and "bottom" positions refer to the positions when the pouch is standing upright.

[0025] The ratio of the height H (see Figure 2) of pouch 10 to the width W1 (see Figure 2) of pouch 10 (H / W1) is preferably 0.6 or more and 2.0 or less. It can hold more contents, and if H / W1 is 2.0 or less, it can be packed in its unopened state. This allows pouch 10 to stand stably on its own. The height H of pouch 10 is the first side, which will be described later. From the lower edge 10G of the pouch 10 in the Y direction DRY, parallel to the direction in which the sealing portion 16 extends This is the length up to the top edge 10F of pouch 10. If the length of the pouch is not constant, the pouch The height shall be the largest value. The width W1 of pouch 10 is the X direction perpendicular to the Y direction DRY. In DRX, the side edge 10H of the first side 10D of the pouch 10 to the side edge 1 of the second side 10E This is the length up to 0I. If the pouch width W1 is not constant, the pouch width is the shortest value. The dimensions of the pouch and the dimensions of each component constituting the pouch in this embodiment are as follows: All measurements were taken with the pouch in a nearly flat state without unfolding the gusset fold. do.

[0026] As shown in Figure 1, the pouch 10 has a bottom gusset that is folded in on the bottom side 10C. It has a set section 14. Note that the pouch 10 shown in Figure 1 is a standing type. It is a pouch, but the pouch may be a flat pouch.

[0027] <Bottom gusset section> The bottom gusset portion 14 is made up of a part of the front film 11 and a part of the back film 12, It is composed of a bottom film 13 and a folding line 14A. It is divided into a first part and a second part. A part of the front film 11 and the bottom film The first part of 13 forms the first pleat, and a part of the back film 12 and the bottom film The second part of 13 forms the second pleat. A bottom gusset portion 14 is provided. This allows for the storage of larger contents or an increase in the capacity of the contents. This also allows pouch 10 to stand on its own.

[0028] In the Y direction (DRY), the folded width W2 of the bottom gusset portion 14 relative to the height H of the pouch 10. The ratio (W2 / H) (see Figure 2) is preferably 0.1 or more and 0.5 or less. If W2 / H is 0.1 or higher, more contents can be accommodated. Also, if W2 / H is 0.5 or higher If placed below, the pouch 10 can be made to stand upright stably. The folded width W2 of the bottom gusset portion 14 is from the lower edge 10G of the bottom 10C to the folded line 14A. This is the length. If the folded width of the bottom gusset is not constant, the folded width of the bottom gusset The shortest value shall be used. The folded width W2 of the bottom gusset portion 14 shall be 20 mm or more and 50 mm or less. It's okay if it is.

[0029] As shown in Figure 1, the pouch 10 is equipped with a sealing portion 15 for sealing the pouch 10. The seal portion 15 in the pouch 10 is formed on the first side portion 10D The seal portion 16, the second side seal portion 17 formed on the second side portion 10E, and the bottom portion 10C The first bottom seal portion 18 and the second bottom seal portion 19 are located on the side edges 10H and 10I. It is equipped with a bottom auxiliary sealing portion 20 that has been formed. Note that in Figure 1, the pouch 10 The top is open, but after the contents are filled into the containment space 10A, it is heat-sealed, as shown in Figure 1. An upper seal portion is formed in the upper seal portion planned area R enclosed by the upper edge 10F and the dashed line. Then, pouch 10 is sealed. When the upper seal portion is formed, the width of the upper seal portion W4( (See Figure 2) Preferably, the diameter is between 2 mm and 15 mm.

[0030] <First side sealing portion and second side sealing portion> The first side sealing portion 16 is formed in the first side portion 10D between the front film 11 and the back film This is the portion where the sheets 12 are joined together, and is formed from the folded line 14A to the upper edge 10F. The second side sealing portion 17 is located on the second side portion 10E, and the front film 11 and the back film are connected. This is the part where the films 12 are joined together, from the fold line 14A to the upper edge 10F of the pouch 10. It is formed over the entire length. When forming the first side seal portion 16 and the second side seal portion 17 The front film 11 and the back film 12 are joined by heat sealing (heat fusion). It breaks.

[0031] The width W3 (see Figure 2) of the first side seal portion 16 and the second side seal portion 17 is, for example, Each is preferably 2 mm or more and 15 mm or less. If the width W3 of the first side seal portion 17 is 2 mm or more, then the width W3 of the second side seal portion 1 6 and the second side sealing portion 17 can be reliably sealed, and the width is 15 mm or less. In that case, a larger accommodation space 10A can be secured. In this specification, each seat In the context of the seal section, "width" refers to the length in the direction perpendicular to the direction in which the seal extends. If the width of the seal portion is not constant, the width of the seal portion shall be perpendicular to the direction in which the seal portion extends. The shortest value among the lengths in the direction is used. The lower limit of the width W3 is preferably 4 mm or more. It is preferable that the upper limit be 10 mm or less.

[0032] <First bottom seal section and second bottom seal section> The first bottom seal portion 18 connects a part of the front film 11 and a part of the bottom film 13. The second bottom seal portion 19 is a part of the back film 12 and the bottom film This is a part where parts of the lum 13 are joined together. The first bottom seal part 18 is the front fill The second bottom seal portion is formed by heat-sealing the 11 and the bottom film 13. 19 is formed by heat-sealing the back film 12 and the bottom film 13. .

[0033] <Bottom auxiliary seal section> The bottom auxiliary sealing portion 20 is located below the fold line 14A and on the side edge 10H of the pouch 10. , formed to include 10I. The bottom auxiliary sealing portion 20 is formed to include the front film 11 This is the part where the back film 12 is joined to each other. The bottom auxiliary sealing part 20 is the bottom film The front film 11 and the back film 12 are heat-fused together through the notches provided in the 13. It is formed by this process. Therefore, it is possible to make the pouch 10 stand upright stably. Cut. Alternatively, instead of a notch, a through hole may be provided in the bottom film 13.

[0034] As shown in Figure 1, the first side seal portion 16 and the second side seal portion 17 are open An opening initiation means 21 is provided which can serve as the starting point for opening. The opening initiation means 21 is on the first side It is sufficient if it is provided in either the part sealing portion 16 or the second side sealing portion 17.

[0035] <<How to start opening>> The opening initiation means 21 can serve as the starting point for opening the pouch 10. Examples of steps 21 include notches and cutouts. The opening initiation means 21 shown in Figure 1 is It has a notch.

[0036] <<Packaging materials>> The front film 11 and the back film 12 are made from the packaging material 30 shown in Figure 3. It is made. Furthermore, the bottom film 13 is made of the packaging material 30 shown in Figure 3. It may be. The packaging material 30 comprises at least the first biaxially oriented plastic film 31 and The second biaxially oriented plastic film 32 and the sealant film 33 are provided in this order. The packaging material 30 does not contain a metal foil layer. Material 30 contains only two biaxially oriented plastic films. (Sealant film) This is a layer that makes up the inner surface of pouch 10. The packaging material 30 shown in Figure 3 is, for example, the 1. Biaxially oriented plastic film 31, printing layer 34, first adhesive layer 35, second biaxially oriented The stretched plastic film 32, the second adhesive layer 36, and the sealant film 33 are arranged in this order. It is equipped with the following. The packaging material is the first biaxially oriented plastic film 31 and sealant A functional layer that performs the desired function may be further provided between the film 33 and the film. Examples of layers include transparent vapor-deposited layers and transparent gas barrier coating films. Pouch 10 This can be manufactured while continuously conveying the packaging material 30 that has been wound into a roll. .

[0037] The packaging material 30 was measured in a 25°C environment after being held for 1 minute. The Young's modulus in one direction and in the direction perpendicular to that direction is 3000 MPa or more. The Young's modulus in the packaging material 30 in one direction is preferably 3100 MPa or higher. It is preferable that the pressure be 3200 MPa or higher, and more preferably 3300 MPa or higher. This is even more preferable. The Young's modulus in the packaging material in the direction perpendicular to one direction is 3050 MP. It is preferable that it is a or higher, more preferably 3100 MPa or higher, and 3200 It is even more preferable that the pressure be MPa or higher. One direction of the packaging material 30 is, for example, the pouch 10 The X direction DRX (see Figure 1) is such that the direction perpendicular to one direction of the packaging material 30 is, for example, For example, the Y direction may be DRY in the pouch 10. Also, for example, the packaging material 30 The flow direction (MD) corresponds to the X direction DRX of the pouch 10, for example, the width direction of the packaging material 30. (TD) may correspond to the Y-direction DRY of pouch 10. Also, for example, of packaging material 30 One direction corresponds to the flow direction (MD), for example, the direction perpendicular to one direction of the packaging material is the width direction. It may also fall under (TD).

[0038] The measurement of the Young's modulus of the packaging material 30 is as follows, except for the lengths of the test specimens S1 and S2 described later. This shall be carried out in accordance with JIS K7127. First, the front film of pouch 10. From 11, excluding the sealing portion 15, one side L1 (see Figure 4) is 15 mm, one side A rectangular test specimen S1 has side L2 (see Figure 4) extending in a direction perpendicular to L1, with a length of 100 mm. Cut out five pieces (see Figure 4). The other side L2 of the test piece S1 is in the X direction DRX (first side seal). Cut out the part 16 so that it is parallel to the direction perpendicular to the direction in which it extends. Next, the pouch 10 From the back film 12, one side L1 (see Figure 5) is such that it does not include the sealing portion 15. A rectangle with a width of 15 mm and another side L2 (see Figure 5) extending perpendicularly to one side L1, both sides being 100 mm in length. Cut out five specimens S2 (see Figure 5) in the shape of a ripple. The other side L2 of specimen S2 is DRY in the Y direction. Cut it out so that it is parallel to the direction in which the first side sealing portion 16 extends. Using the Tensilon RTC-1310A universal material testing machine (manufactured by A&D Company, Limited). Next, the Young's modulus of test specimens S1 and S2 is measured. Specifically, first, as shown in Figure 6... The gripping devices 51 and 52 are used to grip both ends of the test piece S1 in the longitudinal direction. Note that in Figure 6, The layer structure of test specimen S1 has been partially omitted. Furthermore, the environment was set to a temperature of 25°C and a relative humidity of 50%. After holding the test piece S1 below for 1 minute, the initial gripping was performed in an environment with a temperature of 25°C and a relative humidity of 50%. With a distance D1 between the pieces (see Figure 6) of 50 mm, the test piece S was subjected to a tensile speed of 300 mm / min. A tensile test is performed by pulling the material 1 in the longitudinal direction of the test specimen S1, and the Young's modulus of the test specimen S1 is measured. The Young's modulus of test specimen S1 was determined using test specimen S1 that had been held at 25°C for 24 hours. It may be measured. The Young's modulus of test specimen S2 is also measured under the same measurement conditions as for test specimen S1. Then, the Young's modulus was measured for five test pieces S1, and the average value was taken from the packaging material 30. The Young's modulus is defined as the DRX in the X direction. Furthermore, the Young's modulus was measured for five test specimens S2. The average value of this value is taken as the Young's modulus of the packaging material 30 in the Y direction (DRY).

[0039] The packaging material 30 has a puncture strength of 15.0 N or more when measured in an environment of 25°C. The above puncture strength is preferably 15.5N or higher, and preferably 16.0N or higher. It is preferable to be higher.

[0040] The puncture strength of packaging material 30 was measured in accordance with JIS K1707:1999 7.4. This shall be done as follows. First, prepare three of each of the 10 pouches. Regarding 10, the front film 11 is made so as not to include the sealing portion 15, along one side L 3 (see Figure 7) is 75 mm, and the other side L4 (see Figure 7), which extends in a direction perpendicular to one side L3, is 7 Cut out one 5mm square test piece S3 (see Figure 7), and place it on the back film 12 Therefore, excluding the seal portion 15, one side L3 (see Figure 8) is 75 mm, one side L3 The other side L4 (see Figure 8) extending in a direction perpendicular to the other side is 75 mm, forming a square-shaped test specimen S3 (Figure 8) Cut out one of the (reference) pieces. Similarly, cut out test piece S3 from the remaining two pouches. Prepare a total of 6 test specimens S3. One side L3 of the test specimen S3 is DRY in the Y direction (first side Cut out the seal portion 16 so that it is parallel to the direction in which it extends. Then, the tensi Using the RTC-1310A universal material testing machine (manufactured by A&D Co., Ltd.), After holding the test specimen S3 in an environment of 25°C and 50% relative humidity for 1 minute, the temperature was 25°C, and the phase Under conditions of 50% humidity, the outer surface of the packaging material 30 (first biaxially oriented) was applied to the test specimen S3. From the plastic film 31) side, a semicircular shape with a diameter of 1.0 mm and a tip shape radius of 0.5 mm The needle 53 (see Figure 9) is inserted at a speed of 50 mm / min, and the needle 53 penetrates the test piece S3. The maximum stress up to this point is measured. Note that the puncture strength of test specimen S3 is measured in an environment of 25°C. The measurement may also be performed using test specimen S3 that has been held for 24 hours. Also, in Figure 9, test specimen S The layer structure of 3 is partially omitted. For 5 of the 6 test specimens S3, the maximum stress value was obtained. Measure the puncture strength of the packaging material and use the average value as the puncture strength.

[0041] <Biaxially oriented plastic film> Biaxially oriented plastic film is a type of plastic film that improves the mechanical strength of plastic films. Therefore, it is a plastic film that has been intentionally stretched. In the present invention, biaxial A stretched plastic film is one that meets at least one of the following conditions (a) or (b). It refers to something that fulfills a need. (a) Young's modulus is 1000 MPa or more in one direction and in a direction perpendicular to that direction. (b) Tensile elongation is 200% or less in one direction and in a direction perpendicular to that direction.

[0042] The measurement of Young's modulus and tensile elongation of biaxially oriented plastic films is according to JIS K712. This shall be carried out in accordance with Section 7. Tensilon Universal Material Testing Machine RTC-1310A (Co., Ltd.) Using a test kit (manufactured by A&D), the test specimen was subjected to a 1-minute test in an environment with a temperature of 25°C and a relative humidity of 50%. After holding for a period of time, the Young's modulus of the test specimen was measured and the tension was reduced under conditions of 25°C and 50% relative humidity. Tensile strength measurement will be performed. The test will be conducted on a rectangular piece with sides of 15 mm and a length of 150 mm perpendicular to one of the sides. Measurements were taken using a single piece, with an initial gripping distance of 100 mm and a tensile speed of 300 mm / min. Furthermore, as long as it is possible to measure with an initial gripping distance of 100 mm, The length in the direction perpendicular to the edge is adjustable.

[0043] (First biaxially oriented plastic film) The first biaxially oriented plastic film 31 is stretched in two predetermined directions. It is a plastic film. The first biaxially oriented plastic film 31 is a packaging material 30 It functions as a base film to give the first biaxially oriented plastic a predetermined strength. The stretching direction of the film 31 is not particularly limited. For example, the first biaxially oriented plastic The film 31 is stretched in the direction in which the side edge 10H extends and in a direction perpendicular to this direction. It may be. The stretching ratio of the first biaxially oriented plastic film 31 is, for example, 1.0 It is more than five times.

[0044] The first biaxially oriented plastic film 31 contains polyester as its main component. In the detailed description, "containing polyester as the main component" refers to the first biaxially oriented plastic fiber This means the film contains more than 50% polyester by mass. Examples of polyester include... For example, polyethylene terephthalate (hereinafter also referred to as PET), polybutylene terephthalate Examples include PBT (hereinafter also referred to as PBT). Furthermore, the first biaxial stretching plus In the tic film 31, polyester exceeding 50% by mass is one type of polyester It may be composed of two or more types of polyester. Good. As the first biaxially oriented plastic film, a biaxially oriented PET film is used. This is possible. The biaxially oriented PET film preferably contains 80% by mass or more of PET. Furthermore, the biaxially oriented PET film more preferably contains 90% by mass or more of PET. It is even more preferable that it contains 95% or more.

[0045] The thickness of the first biaxially oriented plastic film 31 is preferably 8 μm or more. Preferably it is 9 μm or more, and more preferably 12 μm or more. Also, the first two The thickness of the axially oriented plastic film 31 is preferably 30 μm or less, and more preferably The thickness is 25 μm or less. The thickness of the first biaxially oriented plastic film 31 is 8 μm or more. By doing so, the first biaxially oriented plastic film 31 has sufficient strength. This will result in the thickness of the first biaxially oriented plastic film 31 being 30 μm or less. As a result, the first biaxially oriented plastic film 31 exhibits excellent moldability. Therefore, the process of processing the packaging material 30 to manufacture the pouch 10 can be carried out efficiently. can.

[0046] (Second biaxially oriented plastic film) The second biaxially oriented plastic film 32 is, for example, the first biaxially oriented plastic film Similar to film 31, it is a base film that is stretched in two predetermined directions. The second biaxially oriented plastic film 32 has a side edge 10H extending in the direction and in this direction It may be stretched in a direction perpendicular to the second biaxially oriented plastic film 3 Similar to the first biaxially oriented plastic film 31, the packaging material 30 is given a predetermined strength. It functions as a base film for support. Second biaxially oriented plastic film 32 The stretching direction is also not particularly limited, as in the case of the first biaxially oriented plastic film 31. do not have.

[0047] The second biaxially oriented plastic film 32 contains polyamide as its main component. In the text, "containing polyamide as the main component" refers to the second type of biaxially oriented plastic fill This means that the product contains more than 50% by mass of polyamide. Examples of polyamides include lipids. Examples include aliphatic polyamides or aromatic polyamides. For example, nylon-6, nylon-6,6, and copolymers of nylon-6 and nylon-6,6. Nylon is one example, and as an aromatic polyamide, polymetaxylene adipamide (MXD 6) and others. The second biaxially oriented plastic film 32 is mainly composed of polyamide. By including it as a second biaxially oriented plastic film 32, the packaging material 30 The puncture strength can be increased. As a second biaxially oriented plastic film, Axial-oriented nylon film can be used. Biaxially oriented nylon film is polyamide. It is preferable that the film contains 80% by mass or more of polyamide. Furthermore, the biaxially oriented nylon film contains polyamide. It is more preferable that the mixture contains 90% by mass or more of mido, and even more preferable that it contains 95% by mass or more.

[0048] The thickness of the second biaxially oriented plastic film 32 is preferably 12 μm or more. More preferably 15 μm or more. Also, the second biaxially oriented plastic film 32 The thickness is preferably 30 μm or less, and more preferably 25 μm or less.

[0049] <Sealant film> The sealant film 33 may be a single layer or a multi-layer film. The lead film 33 is preferably made of an unstretched film. Note that "unstretched" means completely Not only unstretched films, but also films that are slightly stretched due to the tension applied during film formation. This concept also includes stretched film.

[0050] A sealant film is one that satisfies at least one of the following conditions (c) or (d). It refers to something that is... (c) Young's modulus is less than 1000 MPa in one direction and in a direction perpendicular to that direction. (d) Tensile elongation of 300% or more in one direction and in a direction perpendicular to that direction.

[0051] The Young's modulus and tensile elongation of sealant films are measured in accordance with JIS K7127. This shall be carried out by: Tensilon Universal Material Testing Machine RTC-1310A (A-An Co., Ltd.) Using a De Day tester, the test specimen was held for 1 minute in an environment with a temperature of 25°C and a relative humidity of 50%. Later, the Young's modulus and tensile elongation of the test specimens were measured under conditions of 25°C and 50% relative humidity. The procedure is carried out using a rectangular test specimen with sides of 15 mm and a length of 150 mm perpendicular to one side. The initial gripping distance will be set to 100 mm and the tensile speed to 300 mm / min. As long as the distance between gripping tools can be measured as 100 mm, one side and perpendicular to each other The length in each direction is adjustable.

[0052] The pouch 10, which is made up of packaging material 30, is subjected to sterilization treatment such as retort processing at high temperature. Therefore, the sealant film 33 has heat resistance to withstand these high-temperature processes. Those possessing the following characteristics are used.

[0053] The melting point of the material constituting the sealant film 33 is preferably 150°C or higher. It is more preferable that the melting point of the sealant film 33 be 160°C or higher. This makes it possible to perform retort processing of pouch 10 at high temperatures, and therefore, The time required for the tort treatment can be shortened. The melting points of the materials are as follows: First biaxially oriented plastic film 31, Second biaxially oriented plastic It is lower than the melting point of the resin that makes up the black film 32.

[0054] The sealant film 33 mainly contains polypropylene. "Contains polypropylene as the main component" means that the sealant film contains more than 50% polypropylene by mass. This means it contains polypropylene. Specifically, materials whose main component is propylene include: These include propylene-ethylene block copolymer, propylene-ethylene random copolymer, Polypropylene such as homopolypropylene, or a mixture of polypropylene and polyethylene Examples include combined products. Here, "propylene-ethylene block copolymerization" can be cited. "Material" refers to a material having the structural formula shown in formula (1) below. "Ethylene random copolymer" refers to a material having the structural formula shown in formula (2) below. Furthermore, "homoplypropylene" refers to a material having the structural formula shown in formula (3) below. It means...

[0055] [ka] In equation (1) above, m1, m2, and m3 represent integers greater than or equal to 1.

[0056] [ka] In equation (2) above, m and n represent integers greater than or equal to 1.

[0057] [ka] In equation (3) above, m represents an integer greater than or equal to 1.

[0058] A material whose main component is propylene, which is a mixture of polypropylene and polyethylene. When using this, the material may have a sea-island structure. Here, "sea-island structure" means A structure in which polyethylene is discontinuously dispersed within a continuous region of polypropylene. cormorant.

[0059] Preferably, the sealant film 33 contains a propylene-ethylene block copolymer. It is a single-layer film. For example, sealant film 33 is made of propylene ethylene blue This is a single-layer, unstretched film primarily composed of rock copolymer. By using a buck copolymer, the impact resistance of the sealant film 33 can be improved. This prevents the pouch 10 from tearing due to the impact of a fall. Yes, it is possible. Furthermore, it can improve the puncture resistance of the packaging material 30.

[0060] Propylene-ethylene block copolymers are, for example, made of polypropylene and It contains an island component consisting of an ethylene-propylene copolymer rubber component, and the sea component is propylene The blocking resistance, heat resistance, rigidity, and seal strength of ethylene block copolymers are improved. It can contribute to improving the impact resistance of propylene-ethylene block copolymer. This can contribute to increasing the attack power. Therefore, by adjusting the ratio of sea components to island components, Adjusting the mechanical properties of sealant film 33 containing propylene-ethylene block copolymer It is possible.

[0061] In propylene-ethylene block copolymer, the quality of the marine component made of polypropylene The mass ratio is higher than the mass ratio of the island component consisting of ethylene-propylene copolymer rubber components. For example, in a propylene-ethylene block copolymer, marine materials made of polypropylene The mass ratio of the fraction is at least 51% by mass, preferably 60% by mass or more. More preferably, it is 70% by mass or more.

[0062] The content of propylene-ethylene block copolymer in sealant film 33 is: For example, it is 80% by mass or more, preferably 90% by mass or more.

[0063] A method for producing propylene ethylene block copolymer involves using a catalyst as the raw material Methods include polymerizing propylene, ethylene, etc. As a catalyst, Ziegler... Natta-type or metallocene catalysts can be used.

[0064] The thickness of the sealant film 33 is preferably 30 μm or more, and more preferably 4 The thickness is 0 μm or more. Furthermore, the thickness of the sealant film 33 is preferably 100 μm or less. The particle size is 80 μm or less, and more preferably 80 μm or less.

[0065] As a single layer sealant film 33 containing a propylene-ethylene block copolymer, There are also types that have a high tensile modulus, such as the ZK207 described later. By using the lantern film 33, consumers can access pouch 1 along the flow direction (MD). By tearing off part 0, the tearability when opening pouch 10 can be improved.

[0066] The sealant film 33 in the flow direction (MD) is held for 1 minute in an environment of 25°C. The tensile elongation (%) measured in a 25°C environment afterwards is preferably 1100% or less. , more preferably 1000(%) or less, 900(%) or less, or 800(%) or less It may also be below. Also, the tensile elongation of the sealant film 33 in the flow direction (MD) The product of (%) and the thickness of the sealant film 33 (μm) is between 30,000 and 50,000. It is preferable that this be the case. The lower limit of this product in the flow direction (MD) is 34000 or more, 3 A value of 6000 or more, or 38000 or more, is preferable.

[0067] The sealant film 33 in the width direction (TD) was held for 1 minute in an environment of 25°C. The tensile elongation (%) measured in an environment of 25°C is preferably 1200 (%) or less. More preferably 1100% or less, 1000% or less, or 900% or less. It may also be lower. Also, the tensile elongation of the sealant film 33 in the width direction (TD) ( The product of the %) and the thickness (μm) of the sealant film 33 is between 45,000 and 55,000. It is preferable that there be a lower limit to this product in the width direction (TD) is 47000 or more, A value of 49,000 or higher is more preferable.

[0068] The sealant film 33 in the flow direction (MD) is held for 1 minute in an environment of 25°C. The tensile modulus (MPa) measured in an environment of 25°C afterwards is preferably 500 MPa or higher. Yes, more preferably 600 MPa or higher, 650 MPa or higher, or 700 MPa. The above is also acceptable. Furthermore, the tensile elasticity of the sealant film 33 in the flow direction (MD) The product of the performance rate (MPa) and the thickness (μm) of the sealant film 33 is preferably 35000. The above, more preferably 38,000 or more, and even more preferably 45,000 or more. The sealant film 33 has a high tensile modulus, which allows the pouch 10 to be opened. This can improve tear resistance when using it.

[0069] The sealant film 33 in the width direction (TD) was held for 1 minute in an environment of 25°C. The tensile modulus (MPa) measured in an environment of 25°C is preferably 450 MPa or higher. Furthermore, it is more preferable to have a pressure of 500 MPa or higher, 550 MPa or higher, or 600 MPa or higher. The above is also acceptable. Furthermore, the tensile modulus of the sealant film 33 in the width direction (TD) The product of (MPa) and the thickness (μm) of the sealant film 33 is preferably 28,000 or more. It is more preferably 30,000 or more.

[0070] The tensile modulus of the sealant film 33 is similar to the tensile elongation of the sealant film 33. Measurements shall be taken using the same measurement method and under the same measurement conditions.

[0071] <Print layer> The printed layer 34 provides information about the contents or packaging product, or adds aesthetic appeal to the pouch. This is a layer for forming the print layer 34, and includes, for example, a colorant and a binder resin. This allows a pattern to be formed on the pouch 10. In this specification, "pattern" means This includes, but is not particularly limited, a wide range of things such as diagrams, letters, patterns, symbols, designs, marks, etc. For gravure printing, we use Finart ink manufactured by DIC Graphics Corporation. It is possible to be there.

[0072] The printing layer 34 may also contain any other additives. Examples of additives include: Lubricants, anti-blocking agents, fillers, hardeners, pigment dispersants, defoamers, leveling agents, wax Cuscus, silane coupling agent, preservative, antioxidant, UV absorber, rust inhibitor, plasticizer, difficult Examples include fuels and color developers. These additives are particularly intended to improve printability and printing effects. It is used appropriately, and its type and amount can be selected as needed depending on the printing method, printing substrate, and printing conditions. The printing layer 34 is applied to the first biaxially oriented plastic film 31 by a printing method such as gravure printing. It can be formed by [this method].

[0073] (Colorants) The colorants are not particularly limited, and known pigments and dyes can be used to achieve the desired color. Select as appropriate.

[0074] (Binder resin) Examples of binder resins include linseed oil, tung oil, soybean oil, hydrocarbon oil, rosin, and ro Zin esters, rosin-modified resins, shellac, alkyd resins, phenolic resins, male Polyvinyl chloride resin, natural resin, hydrocarbon resin, polyvinyl chloride resin, polyacetic acid resin, poly Teylene-based resins, polyvinyl butyral resins, (meth)acrylic resins, polyamide resins Polyester resins, polyurethane resins, epoxy resins, urea resins, melamine resins aminoalkyd resins, nitrocellulose, ethylcellulose, chlorinated rubber, cyclic rubber Examples include polymers of (meth)acrylate compounds, or mixtures thereof.

[0075] <First adhesive layer> The first adhesive layer 35 is a first biaxially oriented plastic film 31 and a second biaxially oriented plastic film It includes an adhesive for bonding a stick film 32 to the product by a dry lamination method.

[0076] The adhesive constituting the first adhesive layer 35 comprises a first composition containing a main agent and a solvent, and a curing agent and It is produced from an adhesive composition prepared by mixing it with a second composition containing a solvent. Specifically, The adhesive contains a cured product formed by the reaction of the main component and solvent in the adhesive composition.

[0077] Examples of adhesives include polyurethane. Polyurethane is the main component. The reaction between the polyol as a curing agent and the isocyanate compound as a curing agent produces This is a cured product of a polyol and an isocyanate compound. An example of polyurethane is... Examples include polyether polyurethane and polyester polyurethane. Polyether polyurethane consists of a polyether polyol as the main component and a curing agent as This is a cured product produced by a reaction with an isocyanate compound. Polyurethane is composed of polyester polyol as the main component and isocyanate as the curing agent. It is a hardened product produced by a reaction with a compound.

[0078] Examples of isocyanate compounds include tolylene diisocyanate (TDI) and 4,4'-di Phenylmethane diisocyanate (MDI), xylylene diisocyanate (XDI) Which aromatic isocyanate compounds, hexamethylene diisocyanate (HDI), iso Aliphatic isocyanate compounds such as holone diisocyanate (IPDI), or Adducts or polymers of the above-mentioned isocyanate compounds can be used.

[0079] The thickness of the first adhesive layer 35 is preferably 2 μm or more, and more preferably 3 μm or more. Furthermore, the thickness of the first adhesive layer 35 is preferably 6 μm or less, and more preferably It is 5 μm or less.

[0080] <Second adhesive layer> The second adhesive layer 36 is made of a second biaxially oriented plastic film 32 and a sealant film. Includes an adhesive for bonding 33 and by dry lamination. Bonding of the second adhesive layer 36 Examples of adhesives include polyurethane, as in the case of the first adhesive layer 35. Yes, it is possible. In addition to the composition, materials, and properties described below, the composition, materials, and properties of the second adhesive layer 36 are also possible. As for properties, the same type as that used for the first adhesive layer 35 can be adopted.

[0081] The thickness of the second adhesive layer 36 is preferably 2 μm or more, and more preferably 3 μm or more. Furthermore, the thickness of the second adhesive layer 36 is preferably 6 μm or less, and more preferably It is 5 μm or less.

[0082] By the way, as mentioned above, the isocyanate compounds that make up the curing agent of the adhesive are Aromatic isocyanate compounds and aliphatic isocyanate compounds exist. Aromatic isocyanate compounds are used in food applications under high-temperature environments such as heat sterilization. Components that cannot be absorbed will leach out. By the way, the second adhesive layer 36 is in contact with the sealant film 33. Therefore, if the second adhesive layer 36 contains an aromatic isocyanate compound, Components eluted from the fragrance-based isocyanate compound come into contact with the sealant film 33. It may adhere to the contents contained in the container space 10A. Considering this issue, Preferably, the adhesive constituting the second adhesive layer 36 includes a polyol as the main component and a hard adhesive. The cured product produced by the reaction with an aliphatic isocyanate compound as a curing agent This is used. As a result, components that cannot be used in food applications due to the second adhesive layer 36 are contained within This prevents the contents from adhering to the container.

[0083] <Transparent vapor deposition layer> The transparent vapor deposition layer is made of a first biaxially oriented plastic film 31 or a second biaxially oriented plastic film. It is formed on the surface of the tic film 32.

[0084] The transparent vapor-deposited layer has a gas barrier function that prevents the permeation of oxygen gas and water vapor. It functions as a layer. Note that two or more transparent vapor deposition layers may be provided. Two transparent vapor deposition layers If the above are present, each may have the same composition or different compositions. Methods for forming the transparent vapor-deposited layer include, for example, vacuum deposition, sputtering, and ion deposition. Physical vapor deposition methods such as particle plating (Plant deposition method, PVD method), or plasma chemical vapor deposition, thermochemical vapor deposition, and Chemical vapor deposition (CVA) methods such as photochemical vapor deposition Examples include the ion method and CVD method. Specifically, roller-type vapor deposition film deposition equipment. Using this method, a vapor-deposited layer can be formed on a film-forming roller.

[0085] The transparent vapor-deposited layer is composed of a transparent inorganic material. Examples of inorganic materials include: Examples include metal oxides and inorganic oxides. Examples of metal oxides include aluminum (A l), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), na Thorium (Na), Boron (B), Titanium (Ti), Lead (Pb), Zirconium (Zr) Examples include metal oxides such as yttrium (Y). Inorganic oxides include silicon (S). i) Oxides are an example. As for inorganic materials that make up the transparent vapor deposition layer, aluminum oxide Aluminum oxide or silicon oxide is preferred.

[0086] The thickness of the transparent vapor-deposited layer is preferably 40 Å to 130 Å, more preferably 50 Å. The above values ​​are 120 Å or less.

[0087] <Transparent gas barrier coating> The transparent gas barrier coating film is transparent and formed on the surface of the transparent vapor-deposited layer. The gas barrier coating film is a layer that functions as a layer for suppressing the permeation of oxygen gas, water vapor, etc. It is. The transparent gas barrier coating film has the general formula R 3 n M(OR 4 ) m (However, in the formula, R 3 , R 4 represents an organic group having 1 to 8 carbon atoms, M represents a metal atom, n represents an integer of 0 or more, represents, m represents an integer of 1 or more, and n + m represents the valence of M.) and contains at least one kind or more of alkoxides, and a polyvinyl alcohol-based resin and / or an ethylene-vinyl alcohol copolymer as described above, and further, a sol-gel method catalyst, an acid, water, and in the presence of an organic solvent, obtained by polycondensation by the sol-gel method from a transparent gas barrier composition.

[0088] In the above general formula R 3 n M(OR 4 ) m As the alkoxide represented by, at least one kind or more of a partial hydrolyzate of the alkoxide and a condensate of hydrolysis of the alkoxide can be used. Further, as the partial hydrolyzate of the above alkoxide, it is not necessary that all of the alkoxy groups are hydrolyzed, and those in which one or more are hydrolyzed, and a mixture thereof may also be used. As the condensate of hydrolysis of the alkoxide, dimers or more of the partial hydrolyzed alkoxide, specifically, dimers to hexamers are used.

[0089] In the alkoxide represented by the above general formula R 3 n M(OR 4 ) m in the metal represented by M The group atoms used include silicon, zirconium, titanium, aluminum, and others. This is possible. In this embodiment, preferred metals include, for example, silicon and titanium. Examples include the following. In addition, in this embodiment, the way in which the alkoxide is used is , using alkoxides of one or more different metal atoms mixed in the same solution. It's also possible.

[0090] Furthermore, the above general formula R 3 n M(OR 4 ) m In the alkoxide represented by R, 3 In the table Specific examples of organic groups that are used include, for example, methyl group, ethyl group, n-propyl group, i-propyl group. Ropyl group, n-butyl group, i-butyl group, sec-butyl group, t-butyl group, n-hexyl Examples of alkyl groups include n-octyl groups, n-octyl groups, and others. General formula R 3 n M(OR 4 ) m In the alkoxide represented by R, 4 Organic group represented by Examples include methyl group, ethyl group, n-propyl group, i-propyl group, n-propyl group. Examples include tyl groups, sec-butyl groups, and others. Note that these can be present in the same molecule. The alkyl groups may be the same or different.

[0091] When preparing the above gas barrier composition, for example, a silane coupling agent can be added. The above silane coupling agent may be a known organic reactive group-containing organoal Coxisilane can be used. In this embodiment, in particular, having an epoxy group Organoalkoxysilanes are preferably used, specifically, for example, γ-glycidoxyp Ropiltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, β-( 3,4-Epoxycyclohexyl)ethyltrimethoxysilane, etc., can be used. The silane coupling agents described above may be used individually or in combination of two or more types.

[0092] Specific examples of packaging material 30 include the following packaging materials. Note that " / " means When listing layers, it is used as a notation to indicate the boundary between layers. Regarding layers, The layers should be described from the outside inward. That is, the layer described on the far right is It is a sealant film. Biaxially oriented PET film / Printing layer / Adhesive layer / Biaxially oriented nylon film / Adhesive layer / -Lant film Biaxially oriented PET film / Transparent vapor deposition layer / Transparent gas barrier coating film / Printed layer / Adhesive layer / Two Axial-oriented nylon film / adhesive layer / sealant film

[0093] According to this embodiment, when measured in an environment of 25°C, one direction (for example, the flow direction (M) D)) and the yan of the packaging material 30 in a direction perpendicular to that direction (for example, the width direction (TD)) Since the pressure coefficients are 3000 MPa or more in each direction, It has a high Young's modulus. This makes it suitable for heat sterilization (boiling) and heat pressurization (retort). This process (including the "touching" treatment) can suppress the occurrence of wrinkles, thus improving the appearance of pouch 10. It is possible to also produce a standing pouch 10 using the packaging material 30. If this is done, it can increase independence.

[0094] Furthermore, the packaging material measured in one direction (e.g., flow direction (MD)) under conditions of 25°C. If the Young's modulus of material 30 is 3100 MPa or higher, the Young's modulus in one direction is high. Furthermore, when heat sterilization (boiling) or heat pressurization (retort processing) is performed, wrinkles may appear. This can suppress the occurrence of [unclear], thus improving the appearance of pouch 10. When a standing pouch 10 is made using the packaging material 30, its self-supporting ability is enhanced. It is possible.

[0095] According to this embodiment, the measurement was taken in a 25°C environment after being held for 1 minute. The puncture strength of the packaging material 30 at that time is 15.0N or higher, therefore the puncture strength is high This helps to suppress the occurrence of pinholes. [Examples]

[0096] To explain the present invention in detail, examples will be given below, but the present invention is these Not limited to what is stated.

[0097] <Example 1> First, as the first biaxially oriented plastic film, a biaxially oriented polyethylene film with a thickness of 12 μm was used. Lenterephthalate film (product name "E5100", manufactured by Toyobo Co., Ltd.) was prepared. Next, a printed layer was formed on this film. The thickness of the printed layer was 1.0 μm. As a second biaxially oriented plastic film, a biaxially oriented nylon film with a thickness of 15 μm was used. (Product name "Bonil QC", Kojin Film & Chemicals Co., Ltd.) was prepared. As a light film, an unstretched polypropylene film with a thickness of 70 μm (product name "ZK We prepared "207" (manufactured by Toray Film Processing Co., Ltd.). ZK207 is the aforementioned propylene It contained ethylene block copolymer.

[0098] ZK207 has low tensile elongation. Specifically, ZK2 in the flow direction (MD) The tensile elongation of 07 is 790% when the thickness is 50 μm, and 7 when the thickness is 60 μm. It is 30%. Therefore, the tensile elongation (%) and thickness (μm) of ZK207 in the flow direction are as follows. The product of ( ) is 39500 when the thickness is 50 μm, and 4380 when the thickness is 60 μm. It is 0. Also, the tensile elongation of ZK207 in the width direction (TD) is given by a thickness of 50 μm. The ratio is 1020% in total, and 870% when the thickness is 60 μm. Therefore, in the width direction... The product of the tensile elongation (%) and thickness (μm) of ZK207 is 51 when the thickness is 50 μm. It is 000, and when the thickness is 60 μm, it is 52200.

[0099] Next, using the dry lamination method, a biaxially oriented polyethylene terephthalate film is produced. Printed layer, first adhesive layer, biaxially oriented nylon film, second adhesive layer, and unstretched polyp Polypropylene films were laminated in sequence to create a packaging material. (First adhesive layer and second adhesive layer) For example, a two-component polyurethane adhesive manufactured by Rock Paint Co., Ltd. (Main component: RU-40 The hardening agent used was H-4). Note that the main component, RU-40, is a polyester polyol. The thickness of the first adhesive layer and the second adhesive layer was 3.0 μm.

[0100] Then, using the three packaging materials prepared above, fill them with 200 ml of water as shown in Figure 1. A standing pouch was created. Specifically, first, the packaging material that forms the bottom of the pouch Fold it in half so that the unstretched polypropylene film, which is the sealant film, is on the outside. Then, the first and second parts are formed connected by a fold line, and then it is folded in half. In this state, when the material is cut and then laminated, the area near the bottom edge of both horizontal edges of the bottom surface is measured by diameter. A 10mm circular hole was punched out to form a through-hole.

[0101] And the space between the packaging material that will become the front film and the packaging material that will become the back film Place the packaging material, which will become the bottom film, in the designated position and heat-seal it under the following conditions. The first side seal portion, the second side seal portion, the first bottom seal portion, and the second bottom seal portion A section was formed. This resulted in a pouch with an open top. Therefore, since there is no packaging material to form the bottom when folded in half, the front film will be used. The packaging material and the packaging material that will become the backing film are directly fused together to form an auxiliary bottom seal. It was done. (Heat fusion conditions) • Heat sealing equipment: Heat sealer TP-701-A (manufactured by Tester Sangyo Co., Ltd.) ·Heat fusion temperature: 220℃ • Heat fusion pressure: 0.1 MPa • Heat fusion time: 1 second

[0102] Afterward, fill the pouch with 200 ml of water through the opening, and then perform the heat sealing under the same conditions as described above. The pouch was sealed by heat fusion under the specified conditions to form the upper seal. After that, the pouch was subjected to The packaging material according to Example 1, which has undergone retort processing, was subjected to retort processing under the following conditions. A pouch was prepared. In Example 1, the flow direction (MD) of the packaging material was the X direction of the pouch. This corresponds to the DRX direction, where the width direction (TD) of the packaging material corresponds to the Y direction (DRY) of the pouch. (Retort processing) • Method: Spray type • Retort temperature: 121℃ · Retort time: 30 minutes

[0103] In the produced pouch, the height H of the pouch was 160 mm, the width W1 of the pouch was 147 mm, the folding width W2 of the bottom gusset part was 46 mm, the widths W3 of the first side seal part and the second side seal part were 7.0 mm, and the width W4 of the upper seal part was 10.0 mm.

[0104] <Example 2> Instead of the unstretched polypropylene film with a thickness of 70 μm (product name "ZK207", manufactured by Toray Film Processing Co., Ltd.), as the sealant film, an unstretched polypropylene film with a thickness of 60 μm (product name "ZK207", Toray Film Processing Co., Ltd.) was used. Otherwise, in the same manner as in Example 1, a packaging material was produced. Then, using three sheets of this packaging material, in the same manner as in Example 1, a pouch according to Example 2 was produced. In Example 2, the flow direction (MD) of the packaging material corresponds to the X direction DRX of the pouch, and the width direction (TD) of the packaging material corresponds to the Y direction DRY of the pouch.

[0105] <Example 3> Instead of the biaxially stretched polyethylene terephthalate film with a thickness of 12 μm (product name "E5100" , manufactured by Toyobo Co., Ltd.), as the first biaxially stretched plastic film, a biaxially stretched polyethylene terephthalate film with a thickness of 1 2 μm (product name "FE2001", manufactured by Futamura Chemical Co., Ltd.) was used. Otherwise, in the same manner as in Example 1, a packaging material was produced . Then, using three sheets of this packaging material, in the same manner as in Example 1, a pouch according to Example 3 was produced. In Example 3, the flow direction (MD) of the packaging material corresponds to the X direction DRX of the pouch , and the width direction (TD) of the packaging material corresponds to the Y direction DRY of the pouch. ​

[0106] <Example 4> 15μm thick biaxially oriented nylon film (product name "Bonil QC", Kojin Film & Instead of Chemicals Co., Ltd., a second biaxially oriented plastic film with a thickness of 1 5μm biaxially oriented nylon film (product name "Unilon G-101", Idemitsu Unitech Co., Ltd.) The packaging material was prepared in the same manner as in Example 1, except that (manufactured by Co., Ltd.) was used. Using these three packaging materials, a pouch according to Example 4 was prepared in the same manner as in Example 1. In Example 4, the flow direction (MD) of the packaging material corresponds to the X direction DRX of the pouch, The width direction (TD) of the packaging material corresponds to the Y direction (DRY) of the pouch.

[0107] <Comparative Example 1> Unstretched polypropylene film with a thickness of 70 μm (product name "ZK207", Toray Film Co., Ltd.) Instead of using (manufactured by Kako Co., Ltd.), use a 60 μm thick unstretched polyp as a sealant film. By using polypropylene film (product name "ZK500", Toray Film Processing Co., Ltd.) The packaging material was prepared in the same manner as in Example 1. Then, using three sheets of this packaging material... A pouch according to Comparative Example 1 was prepared in the same manner as in Example 1. In Comparative Example 1, the packaging The material flow direction (MD) corresponds to the X direction DRX of the pouch, and the width direction (TD) of the packaging material is This corresponds to the DRY direction in the pouch's Y-direction.

[0108] <Comparative Example 2> 15μm thick biaxially oriented nylon film (product name "Bonil QC", Kojin Film & Instead of Chemicals Co., Ltd., a second biaxially oriented plastic film with a thickness of 1 2μm biaxially oriented polyethylene terephthalate film (product name "E5100", Toyobo) The packaging material was prepared in the same manner as in Example 1, except that a product manufactured by [company name] was used. Using these three packaging materials, a pouch according to Comparative Example 2 was prepared in the same manner as in Example 1. In Comparative Example 2, the flow direction (MD) of the packaging material corresponds to the X direction DRX of the pouch. The width direction (TD) of the packaging material corresponds to the Y direction (DRY) of the pouch.

[0109] <Measuring Young's modulus> Packaging materials constituting pouches after retort processing in Examples 1-4 and Comparative Examples 1 and 2 The Young's modulus was measured. Note that, apart from the length of the test specimen (described later), the measurement of the Young's modulus was performed as follows: The procedure was carried out in accordance with JIS K7127. As shown in Figure 4, from the front surface of each pouch, Excluding the sealing portion, one side L1 is 15 mm long, and it extends in a direction perpendicular to one side L1. Five rectangular test specimens S1 were cut out, with the other side L2 being 100 mm. Cut out section 2 so that it is parallel to the X direction (the direction perpendicular to the direction in which the first side seal extends). Next, as shown in Figure 5, from the back of each pouch, excluding the seal portion, A rectangle with one side L1 of 15 mm and the other side L2, which extends perpendicular to side L1, of 100 mm. Five specimens S2 were cut out in the shape shown. The other side L2 of specimen S2 is in the Y direction (first side sealing part). It was cut so that it was parallel to the direction in which it extends. Then, Tensilon multipurpose material Using a RTC-1310A test machine (manufactured by A&D Co., Ltd.), at a temperature of 25°C, After holding test specimen S1 in an environment with 50% relative humidity for 1 minute, the temperature was 25°C and the relative humidity was 50 Under conditions of %, the initial distance D1 between gripping devices is 50 mm, and the tensile speed is 300 mm / min. Tensile tests were performed to measure the Young's modulus of the test specimen S1. Then, the Young's modulus was measured, and the average value was taken as the Young's modulus of the packaging material in the X direction. Similarly, the Young's modulus of test piece S2 was measured. For five test pieces S2, the Young's modulus was measured, and its average value was taken as the Young's modulus of the packaging material in the Y direction. Note that L1, L2, S1, S2, and D 1 are as shown in FIGS. 4 to 6.

[0110] <Puncturing strength> The puncturing strength of the packaging material constituting the retort-treated pouches according to Examples 1 to 4 and Comparative Examples 1 and 2 was measured in accordance with JIS K1707:1999 7.4. First, for the retort-treated pouches according to Examples 1 to 4 and Comparative Examples 1 and 2, three each were prepared. For one pouch, from the front surface, so as not to include the seal portion, a test piece S 3 having a square shape with one side L3 of 75 mm and the other side L4 extending in a direction perpendicular to side L3 of 75 mm was cut out. Also, from the back surface, so as not to include the seal portion, a test piece S3 having a square shape with one side L3 of 75 mm and the other side L4 extending in a direction perpendicular to side L3 of 75 mm was cut out. For the remaining two pouches, test piece S3 was cut out in the same manner, and a total of six test pieces S3 were prepared. Test piece S3 was cut out such that one side L3 was parallel to the Y direction (the direction in which the first side seal portion extends parallel). Then, using a Tensilon universal material testing machine RTC-1310A (manufactured by A&D Company, Limited), after holding each test piece S3 for 1 minute in an environment of 25°C and 50% relative humidity, in an environment of 25°C and 50% relative humidity, for test piece S3, from the outer surface (biaxially stretched PET film) side of the packaging material, a semi-circular needle with a diameter of 1.0 mm and a tip shape radius of 0.5 mm was pierced at a speed of 50 mm / min. Using a Tensilon universal material testing machine RTC-1310A (manufactured by A&D Company, Limited), after holding each test piece S3 for 1 minute in an environment of 25°C and 50% relative humidity, in an environment of 25°C and 50% relative humidity, for test piece S3, from the outer surface (biaxially stretched PET film) side of the packaging material, a semi-circular needle with a diameter of 1.0 mm and a tip shape radius of 0.5 mm was pierced at a speed of 50 mm / min. For test piece S3, from the outer surface (biaxially stretched PET film) side of the packaging material, a semi-circular needle with a diameter of 1.0 mm and a tip shape radius of 0.5 mm was pierced at a speed of 50 mm / min. For test piece S3, from the outer surface (biaxially stretched PET film) side of the packaging material, a semi-circular needle with a diameter of 1.0 mm and a tip shape radius of 0.5 mm was pierced at a speed of 50 mm / min. The maximum stress until the needle penetrated the test specimen S3 was measured. Of the 6 test specimens S3, 5 For each sample, the maximum stress was measured, and the average value was used as the puncture strength of the packaging material. L3, L4, and S3 are as shown in Figures 7 and 8.

[0111] <Exterior Evaluation> The appearance of the pouches after retort processing in Examples 1-4 and Comparative Examples 1 and 2 was evaluated. The evaluation was carried out as follows. First, instead of the above retort treatment, the following conditions were used: The pouch was retort-processed. (Retort processing) • Method: Spray type • Retort temperature: 135℃ • Retort preparation time: 40 minutes

[0112] Next, prepare 10 pouches of each type after retort processing and check if wrinkles have formed in the pouches. I visually checked to see if there were any wrinkles. I performed this process on 10 pouches, and wrinkles were found in all 10 pouches. The number of pouches that were not processed, and the number of pouches that developed wrinkles but whose wrinkles were at a level that was practically acceptable. The number of each was counted.

[0113] The composition of the packaging materials is shown in Table 1, and the evaluation results are shown in Table 2. [Table 1]

[0114] [Table 2]

[0115] The results are described below. As shown in Table 2, the packaging materials for Examples 1 to 4 are: Compared to the packaging material of Comparative Example 1, the occurrence of wrinkles in the pouch after retort processing can be suppressed. Furthermore, the packaging material constituting the pouches in Examples 1 to 4 was the same as the pouch in Comparative Example 2. Because it has higher puncture resistance compared to the packaging materials that make up the structure, it suppresses the occurrence of pinholes. It is possible. [Explanation of symbols]

[0116] 10... Pouch 10A...Accommodation space 11…Front surface film 12…Backside film 13…Bottom film 15...Seal part 30...Packaging materials 31…First biaxially oriented plastic film 32…Second biaxially oriented plastic film 33...Sealant film

Claims

[Claim 1] A pouch containing packaging material and having a storage space, The packaging material comprises a first biaxially oriented plastic film and a second biaxially oriented plastic film. The device is equipped with a sealant film and a protective film in this order. The first biaxially oriented plastic film is mainly composed of polyester, The second biaxially oriented plastic film is mainly composed of polyamide, The sealant film is mainly composed of polypropylene, The packaging material contains only two biaxially oriented plastic films. The packaging material was measured at 25°C after being held in an environment of 25°C for 1 minute. The Young's modulus in one direction and in the direction perpendicular to the said direction is 3000 MPa or more. can be, The packaging material was measured at 25°C after being held in an environment of 25°C for 1 minute. A pouch with a puncture strength of 15.0 N or more.

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