JP2020055568A - Pouch - Google Patents

Abstract

To provide a pouch in which steam can be stably released from a steam releasing mechanism when heated in a microwave oven.SOLUTION: According to one embodiment of the present invention, a pouch 10-1 is provided in which: front surface films 11, 12 and a back surface film 13 include at least a first base material layer 51 and a sealant layer 56; a front surface 10B is provided with a palm section 14; the palm section 14 is provided across a third edge 10G to a fourth edge 10H; a seal section 20 comprises an outer seal section 21 located at an outer edge 10D of the pouch 10 and extending along the outer edge 10D, a palm seal section 22 provided on the palm section 14, and a steam release seal section 31 provided in the palm section 14 and configured to peel off due to an increase of the pressure in an accommodation space 10A; the pouch 10-1 is configured such that steam is released by peeling of the steam seal section 31 when the pressure in the accommodation space 10A is 130 kPa or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to pouches.

  2. Description of the Related Art Conventionally, pouches that can mainly store food materials have been widely used. As such a pouch, a self-supporting pouch including a steam release mechanism and a chuck tape unit for automatically releasing steam generated by heating in a microwave oven to the outside of the pouch is known (for example, And Patent Document 1).

  In a self-supporting pouch having a steam release mechanism and a chuck tape section, since the steam release mechanism and the chuck tape section are provided, the ingredients are put in a pouch in which a liquid seasoning is stored in advance, and the pouch is made to be free standing. It is assumed that the ingredients are cooked by heating in a microwave oven.

JP 2013-177204 A

  However, in a self-supporting pouch including a steam release mechanism and a chuck tape portion as disclosed in Patent Literature 2, when the ingredients are large (especially when the contents are long in the height direction of the pouch), the pouch is used. In a state in which the liquid seasoning is in a self-standing state, there is a portion where the liquid seasoning does not come into contact, and the taste may be uneven. For this reason, it is required to heat the pouch in a microwave oven in a state where the pouch is laid down. Materials and ingredients may leak.

  The present invention has been made to solve the above problems. That is, an object of the present invention is to provide a pouch that can be cooked in a horizontal state.

The present invention includes the following inventions.
[1] A pouch including a front face film constituting a front face and a back face film constituting a back face and having a storage space, wherein a first edge and a second edge facing the first edge are provided. An edge, a third edge and a fourth edge extending between the first edge and the second edge, and a seal portion for sealing the pouch, wherein the front face film and the back face film are at least It comprises a base material layer and a sealant layer, on the front surface, a joint portion is provided, the joint portion is provided from the third edge to the fourth edge, and the seal portion is provided on the pouch. An outer edge seal portion located at an outer edge and extending along the outer edge, a palm seal portion provided on the palm portion, and a seal portion provided on the palm portion and configured to be peeled off by an increase in pressure of the housing space. And a steam release seal portion, A first member having a first fitting portion extending from the third edge to the four edges is joined to the inner surface of the film, and the first member is attached to the inner surface of the back film or the front film from the third edge. A second member extending across the four edges and having a second fitting portion engageable with the first fitting portion is joined, and the first fitting portion and the second fitting portion are A pouch located on the second edge side from a scheduled opening position.

[2] The pouch according to the above [1], wherein the pouch is configured such that the vapor escapes when the pressure in the accommodation space is 130 kPa or less by peeling of the vapor release seal portion.

[3] The pouch according to the above-mentioned [1] or [2], wherein the pouch is configured such that when the pressure in the accommodation space is 110 kPa or more, vapor is released by peeling of the vapor release seal portion.

[4] The product of the tensile elongation (%) in the first direction and the thickness (μm) of the sealant layer in the first direction is 30,000 to 50,000, and the tensile elongation of the sealant layer in the second direction orthogonal to the first direction is provided. The pouch according to any one of the above [1] to [3], wherein the product of the degree (%) and the thickness (μm) is 45,000 or more and 55000 or less.

[5] The product of the tensile elongation (%) and the thickness (μm) in the first direction of the sealant layer exceeds 50,000, and the tensile elongation (%) of the sealant layer in the second direction orthogonal to the first direction The pouch according to any one of the above [1] to [3], wherein the product of the thickness of the pouch and the thickness (μm) exceeds 55,000.

[6] The seal strength according to any one of [1] to [5], wherein the seal strength at 25 ° C is 30 N or more and 60 N or less, and the seal strength at 100 ° C is 23 N or less. Pouch.

[7] The pouch according to any one of [1] to [6], wherein the sealant layer contains a propylene / ethylene block copolymer.

[8] The pouch according to the above [7], wherein the sealant layer further contains an elastomer.

[9] The pouch according to any one of [1] to [8], wherein the front surface and the back film on the second edge side are joined.

[10] The second edge side further includes an intermediate film disposed between the front film and the back film, and including at least a base material layer and a sealant layer, wherein the front film, The pouch according to any one of [1] to [9], wherein a gusset portion is provided by a back film and the intermediate film.

[11] The pouch according to any one of [1] to [10], wherein a content is accommodated in the accommodation space of the pouch.

  According to the present invention, it is possible to provide a pouch capable of stably releasing steam from a steam release mechanism during heating in a microwave oven.

It is a front view of the pouch concerning an embodiment. FIG. 2 is a cross-sectional view of the pouch shown in FIG. 1 taken along a line II. FIG. 3 is an enlarged sectional view of the chuck tape shown in FIG. 2. FIG. 2 is a view for explaining dimensions of each component of the pouch shown in FIG. 1. It is sectional drawing which shows the test piece used when measuring seal strength. It is a figure showing signs that seal strength is measured using a test piece. It is sectional drawing of the packaging material used for a pouch. It is sectional drawing of another packaging material used for a pouch. It is a front view of other pouches concerning an embodiment. It is sectional drawing when the pouch shown in FIG. 9 is cut | disconnected by the II-II line. FIG. 10 is a diagram for explaining dimensions of each component of the pouch shown in FIG. 9. It is a schematic diagram of the 2nd content stored in a pouch. It is a top view of the pouch which accommodated the 2nd content of FIG.

  Hereinafter, a pouch according to an embodiment of the present invention will be described with reference to the drawings. In this specification, terms such as “film” and “sheet” are not distinguished from each other based only on the difference in names. Therefore, for example, “film” is used in a sense that includes a member that is also called a sheet. FIG. 1 is a front view of the pouch according to the present embodiment, FIG. 2 is a cross-sectional view of the pouch shown in FIG. 1 taken along the line II, and FIG. 3 is a cross-sectional view of the chuck tape shown in FIG. FIG. 4 is an enlarged sectional view, and FIG. 4 is a view for explaining dimensions of each component of the pouch shown in FIG. FIG. 5 is a cross-sectional view showing a test piece used for measuring the seal strength, and FIG. 6 is a view showing how the seal strength is measured using the test piece. FIG. 7 is a cross-sectional view of a packaging material used for the pouch, and FIG. 8 is a cross-sectional view of another packaging material used for the pouch. 9 is a front view of another pouch according to the embodiment, FIG. 10 is a cross-sectional view of the pouch shown in FIG. 9 taken along the line II-II, and FIG. 11 is a cross-sectional view of the pouch shown in FIG. It is a figure for explaining the size of each component. FIG. 12 is a schematic view of the second contents stored in the pouch, and FIG. 13 is a plan view of the pouch of the present embodiment storing the second contents of FIG.

<<<< Pouch >>>>
The pouch 10-1 shown in FIG. 1 is a planar pouch. In the pouch 10-1, in addition to the contents previously stored in the sealed pouch 10-1 (hereinafter, the contents are referred to as "first contents"), the pouch 10-1 is used by the consumer. A pouch 10 in which a part of the pouch 10-1 is opened and a content is further heated by a microwave oven or the like with a different content added thereto (hereinafter, this content is referred to as "second content"). A usage of -1 is assumed.

  Examples of the first content include seasonings such as liquid seasonings, soups, broths, and powders. As the second content, a material that is preferably heated together with the first content is selected. Examples of the second contents include meat (including both raw meat and processed meat), fish (including raw fish, processed fish, and the like), foodstuffs such as vegetables, noodles, cracking, water, and the like. In addition, as long as it can be heated by a microwave oven, it is possible to select other than the above as the first content and the second content.

  The pouch 10-1 has an accommodation space 10A for accommodating the first content and the second content. The term “pouch” is a concept including not only a pouch in which contents are not filled but also a pouch in which contents are filled.

  The pouch 10-1 shown in FIG. 1 has a front surface 10B and a back surface 10C (see FIG. 2). The front surface 10B and the back surface 10C have a rectangular outline. The front surface 10B is composed of two front films 11 and 12, and the rear surface 10C is composed of one rear film 13. Therefore, the pouch 10-1 is composed of three sheets. It is composed of film. However, the number of pouches is not particularly limited as long as the pouch is composed of one or more films.

  As shown in FIG. 1, the outer edge 10D of the pouch 10-1 includes a first edge 10E, a second edge 10F facing the first edge 10E, and a third edge 10G extending between the first edge 10E and the second edge 10F. And the fourth edge 10H. The fourth edge 10H faces the third edge 10G.

  The pouch 10-1 includes a joint portion 14 provided on the front surface, a seal portion 20 for sealing the pouch, and opening start means 15 for facilitating opening of the pouch 10-1.

<< Gap part >>
The joint portion 14 is provided to extend from the third edge 10G to the fourth edge 10H. The joint part 14 is a part where the sealant layers of the front films 11 and 12 face each other. The joint portion 14 has a first edge 14A, a second edge 14B and a third edge 14C extending between the first edge 14A and the accommodation space 10A. The third edge 14C faces the second edge 14B.

  In the joint portion 14, a joint seal portion described later, a first unsealed portion 14D communicating with the accommodation space 10A, and a vapor release mechanism 30 are formed.

<< Seal part >>
The seal portion 20 may seal the pouch 10-1 in a state where the contents are stored in the storage space 10A, and may not seal the pouch 10-1 in a state where the contents are not stored. May be. The seal portion 20 is provided at the outer edge 10D of the pouch 10-1, and extends along the outer edge 10D, the armature seal portion 22 provided at the armor portion 14, and the armor portion 14; A steam release seal portion 31 configured to be separated by an increase in the pressure of the accommodation space 10A of the pouch 10-1.

  If the seal strength of the seal portion 20 of the pouch heated by the microwave oven and heated to a high temperature becomes an appropriately low value, the steam release seal portion 31 is easily peeled off based on the force received from the pressure of the steam generated in the housing space. Become. That is, the steam release seal portion 31 comes off at a lower pressure. For this reason, for example, the seal strength of the seal portion 20 at 100 ° C. (hereinafter, also sometimes referred to as “hot seal strength”) is preferably 23 N or less, more preferably 15 N or less, and furthermore Preferably it is 11N or less, most preferably 10N or less. If the hot seal strength is too low, it is considered that the vapor release seal portion 31 is peeled off before the contents are sufficiently heated and pressurized, and the pressure and temperature of the housing space 10A are reduced. Can be In consideration of this point, the hot sealing strength of the sealing portion 20 of the pouch 10-1 is preferably 4N or more, more preferably 5N or more.

  In the present embodiment, as a method for configuring the sealing portion 20 so that the hot sealing strength of the sealing portion 20 of the pouch 10-1 is 23 N or less, the pouch 10-1 at a low temperature, for example, at 25 ° C. Of the seal portion 20 (hereinafter, also referred to as “normal temperature seal strength”) is appropriately managed. As a result of intensive studies conducted by the present inventors, in the pouch 10-1, by configuring the seal portion 20 so that the room temperature seal strength is 60N or less, the hot seal strength of the seal portion 20 is reduced to 23N or less. I found that I can do it. Based on such knowledge, in the present embodiment, the pouch having the seal portion 20 having a hot seal strength of 23 N or less is set by setting the configuration conditions of the seal portion 20 so that the room temperature seal strength is 60 N or less. 10-1 can be manufactured. The room-temperature sealing strength of the seal portion 20 is 35 N since the seal portion 20 of the pouch 10-1 can be prevented from peeling off due to the force applied to the pouch 10-1 during transportation or the like. It is preferable that it is above.

  Further, the lower limit of the room-temperature sealing strength of the seal portion 20 at 25 ° C. is preferably 35 N or more, more preferably 40 N or more, and may be 45 N or 50 N or more. The upper limit of the room-temperature sealing strength of the sealing portion 20 at 25 ° C. is preferably 55 N or less.

  Factors that determine the room-temperature sealing strength of the seal portion 20 include the mechanical properties and thickness of a sealant layer described below located on the inner surface of the packaging material. In the case where the seal portion 20 such as the steam release seal portion 31 is formed by heat fusion (heat sealing), the seal strength of the seal portion 20 may change depending on the condition of heat fusion such as temperature. Further, the sealing strength of the seal portion 20 may be changed by a sterilization process such as a boil process or a retort process. In the present embodiment, by properly adjusting and considering these factors, it is possible to form the seal portion 20 having a room temperature seal strength of 30 N or more and 60 N or less. When the pouch 10-1 is subjected to a process such as a boil process or a retort process, the “seal strength of the seal portion” refers to the seal strength of the pouch after the process is performed, unless otherwise specified. Means seal strength. The “retort treatment” is a process of filling the contents into a pouch, sealing the pouch, and then heating the pouch in a pressurized state using steam or heated hot water. The temperature of the retort treatment is, for example, 120 ° C. or higher. “Boiling” is a process of filling the contents into a pouch, sealing the pouch, and then baking the pouch under atmospheric pressure. The temperature of the boiling process is, for example, 90 ° C. or more and 100 ° C. or less.

  When a treatment such as a boil treatment or a retort treatment is performed, in the pouch 10-1 before the treatment, the room-temperature seal strength of the seal portion 20 is 35N or more and 60N or less, and the hot seal strength is 23N or less. Good.

  The seal strength of the seal portion can be measured using a tensile tester equipped with a thermostatic chamber (model number “RTC-1310A”, manufactured by Orientec Co., Ltd.) in accordance with JIS Z1707: 1997 7.5. Specifically, first, a test piece S for measuring the seal strength of the seal portion is prepared. For example, in FIG. 3, a portion (for example, a portion surrounded by a dashed line) of the pouch 10-1 including the palm joint seal portion 22 is cut out to obtain a test piece S extending along the second direction DR2. The width W1 (see FIG. 3) of the test piece S in the first direction DR1 orthogonal to the second direction DR1 is 15 mm.

  FIG. 4 is a sectional view showing the test piece S. The test piece S includes a seal portion S1 where the sealant layer 56 of the front film 11 and the sealant layer 56 of the front film 12 are joined, such as a joint seal portion, and a sealant of the front film 11. And the unsealed portion S2 in which the layer 56 and the sealant layer 56 of the front film 12 are not joined. The packaging material 50, the first base material layer 51, and the second base material layer 54 shown in FIG. 4 will be described later, and the description thereof will be omitted.

  FIG. 5 is a diagram showing how the seal strength is measured using the test piece S. First, the front films 11 and 12 are gripped by the gripper 101 and the gripper 102 of the measuring device, respectively, in the unsealed portion S2. Further, each of the grippers 101 and 102 is pulled at a speed of 300 mm / min in opposite directions in a direction perpendicular to the surface direction of the seal portion S1 of the test piece S, and the maximum value of the tensile stress is measured.

  For a plurality of test pieces S, the maximum value of the tensile stress is measured, and the average value is defined as the seal strength. The distance D between the grippers 101 and 102 at the start of the pull is, for example, 20 mm, and the distance D between the grippers 101, 102 at the end of the pull is, for example, 40 mm. When measuring the normal temperature seal strength, the environment at the time of the measurement is, for example, a temperature of 25 ° C. and a relative humidity of 50%. When measuring the hot seal strength, the environment at the time of the measurement is, for example, a temperature of 100 ° C. and a relative humidity of 50%.

<Outer edge seal part>
The outer edge seal portion 21 includes a first outer edge seal portion 21A formed on the first edge 10E side, a third outer edge seal portion 21C formed on the third edge 10G side, and a fourth outer edge formed on the fourth edge 10H side. And a seal portion 21D. The first outer edge seal portion 21A, the third outer edge seal portion 21C, and the fourth outer edge seal portion 21D are portions where the front films 11, 12 and the rear film 13 are joined to each other. The bonding of the front films 11, 12 and the rear film 13 at the time of forming the outer edge seal portion 21 is performed by heat fusion. Although the pouch 10-1 shown in FIG. 1 is open at the second edge 10F side, after filling the contents into the accommodation space, the second side portion surrounded by the second edge 10F and the two-dot chain line is shown. The second outer edge seal portion 21B is formed by heat-sealing the seal portion forming region R, and the pouch 10-1 is sealed.

  The width W2 (see FIG. 3) of the outer edge seal portion 21 is preferably, for example, not less than 2 mm and not more than 15 mm. If the width W2 of the outer edge seal portion 21 is 2 mm or more, the outer edge seal portion 21 can be reliably sealed, and if the width W2 is 15 mm or less, a wider accommodation space 10A can be secured. In this specification, the “width” of each seal portion means a length in a direction orthogonal to a direction in which the seal portion extends. When the width of the seal portion is not constant, the width of the seal portion is set to the shortest value among the lengths in the direction orthogonal to the direction in which the seal portion extends. Further, the dimensions of the pouch and the dimensions of each component constituting the pouch in this specification are all in a state where the front and back surfaces are in contact with each other, that is, in a state where the contents are substantially flat without containing the contents. Take the measured value. The lower limit of the width W1 is preferably 4 mm or more, and the upper limit is preferably 10 mm or less.

<Seal part>
The joint seal portion 22 is a portion in which a part of the front surface films 11 and 12 are joined to each other. The bonding of the front films 11 and 12 at the time of forming the joint seal portion is performed by heat fusion.

  The palm joint portion 22 is formed on the first edge 14A side of the joint portion 14 from the second edge 14B to the third edge 14C on the first edge 14A side, and on the second edge 14B side of the palm joint portion 14. A second palm joint seal portion 22B, and a third palm joint seal portion 22C formed on the third edge 14C side of the palm joint portion 14. The width W3 (see FIG. 3) of the joint seal portion 22 is preferably, for example, not less than 2 mm and not more than 15 mm.

<< Opening start means >>
The opening start means 15 can be a starting point at the time of opening the pouch 10-1 and is formed at a scheduled opening position P of the third outer edge seal portion 21C and the fourth outer edge seal portion 21D. The opening start means 15 may be a notch or a notch. The opening start means 15 shown in FIG. 1 is notched. The opening start means 15 is formed on the third outer edge seal portion 21C and the fourth outer edge seal portion 21D. However, the opening start means may be formed only on the third outer edge seal portion or only on the fourth outer edge seal portion. .

  The pouch 10-1 includes a steam release mechanism 30 for releasing steam generated when heating the contents stored in the pouch 10-1 to the outside. The steam release mechanism 30 allows the inside and the outside of the pouch 10-1 to communicate with each other to release the steam when the pressure of the steam becomes equal to or higher than a predetermined value, and suppresses the steam from being released from a portion other than the steam release mechanism 30. It is configured to be.

<Steam release mechanism>
The steam release mechanism 30 shown in FIG. 1 includes a steam release seal portion 31 and an unsealed second unsealed portion 32 isolated from the housing space 10A by the steam release seal portion 31.

(Steam release seal)
The steam release seal portion 31 protrudes from the first gasket seal portion 22A and is connected to the first gasket seal portion 22A. One end 31A and the other end 31B of the steam release seal part 31 shown in FIG. 1 are connected to the first joint seal part 22A. Thereby, the second unsealed portion 32 is isolated from the housing space 10A. However, as long as the steam release seal portion is located on the center side of the accommodation space with respect to the palm joint portion, it may be separated from the palm joint portion.

  The steam release seal portion 31 is to be peeled off when the pressure in the pouch 10-1 reaches a predetermined pressure due to the heating, whereby the first unsealed portion 14D and the second unsealed portion 14D communicating with the accommodation space 10A are formed. The unsealed portion 32 communicates, and the steam in the storage space 10A is automatically discharged to the outside of the pouch 10-1 through a through hole 32A of the second unsealed portion 32 described later. Further, since the steam release seal portion 31 protrudes toward the storage space 10A side from the first gasket seal portion 22A, when the pressure in the pouch 10-1 increases due to heating by the microwave oven, the steam release seal portion 31 is formed. The stress tends to concentrate on 31. In addition, since the peeling easily progresses from the steam release seal portion 31, it is possible to suppress the progress of the peeling from the outer edge seal portion and the joint seal portion.

  The seal width W4 of the steam release seal portion 31 is preferably, for example, 1 mm or more and 5 mm or less, from the viewpoint of easily releasing steam.

<Second unsealed part>
In the second unsealed portion 32, a through hole 32A penetrating at least one of the front films 11 and 12 is formed. The through-hole 32A communicates with the outside.

  The pouch 10-1 is configured such that when the pressure in the housing space 10 </ b> A is 130 kPa or less, the steam is released by peeling off the steam release seal portion 31. Also, if the vapor release seal is peeled off too quickly with respect to the pressure in the storage space, the vapor release seal separates before the content is sufficiently heated and pressurized, and the pressure and temperature in the storage space decrease. There is a risk that it will. In consideration of this point, it is preferable that the pouch 10-1 be configured to release steam when the pressure of the storage space 10A is 110 kPa or more by peeling of the steam release seal portion 31.

  A method for measuring the pressure in the pouch 10-1 during heating by a microwave oven will be described. First, a method of measuring the pressure of the pouch 10-1 when an unsealed pouch 10-1 as shown in FIG. 1 is available will be described with reference to FIG. FIG. 5 is a longitudinal sectional view showing the pouch 10-1 in which a sensor for measuring pressure is provided in the housing space.

  First, as shown in FIG. 1, a pouch 10-1 in which the second outer edge seal portion 21B is not formed on the second edge 10F and the second edge is open is prepared. Subsequently, the sensor 103 of the data logger capable of measuring the pressure is arranged inside the pouch 10-1. For example, the sensor 103 is attached to the inner surface of the pouch 10-1. Further, a predetermined amount of water, for example, 100 ml of water is filled in the accommodation space of the pouch 10-1. Thereafter, the second outer edge sealing portion 21B is formed to seal the pouch 10-1. As the data logger, for example, PicoVACQ PT manufactured by TMI-ORION can be used. PicoVACQ PT can also measure temperature in addition to pressure.

  Then, the water in the pouch 10-1 is heated using a microwave oven or the like while measuring the pressure immediately before the steam in the storage space 10A escapes (hereinafter referred to as the steam escape pressure) using the sensor 103 at predetermined time intervals. I do. As the microwave oven, any one having an output in the range of 500 W to 1500 W can be used. The time interval is, for example, 0.1 second or more and 10 seconds or less, for example, 1.0 second.

  When the water evaporates and the pressure in the housing space 10A increases, the seal portion 20 peels off and the housing space 10A communicates with the outside of the pouch 10-1, the pressure in the housing space 10A measured by the sensor 103 suddenly increases. To decline. The pressure in the storage space 10A, which is measured immediately before the pressure starts to drop sharply, is recorded as the pressure at which the pouch 10-1 releases steam. The temperature of the housing space 10A immediately before the pressure starts to drop sharply is, for example, 80 ° C. or more and 120 ° C. or less.

  Next, a method for measuring the vapor release pressure of the pouch using the sealed pouch 10-1 in which the contents are accommodated will be described below.

  First, a sealed pouch 10-1 is prepared. Subsequently, the pouch is opened from the opening start means, and a zipper tape section 40 described later is opened. After that, the contents contained in the pouch 10-1 are taken out through the opening formed by opening the chuck tape portion 40. Thereafter, the inside of the pouch 10-1 may be washed to further remove the contents adhering to the inner surface of the pouch 10-1.

  After taking out the contents, a data logger sensor capable of measuring pressure is arranged inside the pouch 10-1 as described above. Thereafter, a predetermined amount of water, for example, 100 ml of water is filled in the accommodating space of the pouch 10-1, and then the chuck tape portion 40 is closed. Then, similarly to the above, while measuring the pressure of the storage space 10A at predetermined time intervals using a sensor, the water in the pouch 10-1 is added using a microwave oven or the like to reduce the pressure at the time of vapor release of the pouch. Can be measured.

  The pouch 10-1 includes a chuck tape unit 40 attached to the inner surface of the pouch 10-1. As shown in FIG. 3, the chuck tape portion 40 includes a first member 41 joined to the inner surface of the front film 11 and a second member 42 joined to the inner surface of the back film 13. .

<First member and second member>
The first member 41 has a first joining portion 41A joined to the inner surface of the front surface film 11, and a first fitting projecting from the first joining portion 41A and extending from the third edge 10G to the fourth edge 10H. And a portion 41B. The second member 42 includes a second joint portion 42A joined to the inner surface of the back film 13 and a second fitting portion 42B protruding from the second joint portion 42A and extending from the third edge 10G to the fourth edge 10H. Having. The second fitting portion 42B is capable of fitting with the first fitting portion 41. Although the first fitting portion 41B shown in FIG. 3 is a male fitting portion and the second fitting portion 42B is a female fitting portion, the first fitting portion is a female fitting portion. The second fitting portion may be a male fitting portion. Further, the first fitting portion 41B and the second fitting portion 42B are located on the second edge 10F side from the opening position P.

  The fitting strength (inner fitting strength) of the first fitting portion 41B and the second fitting portion 42B when the chuck tape portion 40 is opened from the second edge 10F side is the chuck tape portion 40 from the first edge 10E side. It is preferable that the fitting strength (outside fitting strength) of the first fitting portion 41B and the second fitting portion 42B when the opening is opened is higher. By making the inner fitting strength higher than the outer fitting strength, the chuck tape portion 40 can be easily opened when the second content is charged or unloaded, while the microwave is heated by the microwave oven. When the pressure inside the pouch 10-1 increases, the first fitting portion 41B and the second fitting portion 42B are disengaged, and the first content and the second content are removed from the chuck tape portion 40. Leakage can be suppressed. In addition, when the pressure in the pouch 10-1 is increased due to heating by the microwave oven, the steam can be removed from the steam removing mechanism 30, so that cooking can be performed safely. The inner fitting strength and the outer fitting strength can be measured as follows. First, the chuck tape portion is cut out to have a width of 30 mm. Here, the “width” means a length in a direction in which the chuck tape portion extends. When measuring the inside fitting strength, a tensilon tensile tester (model number “RTC-1310A”, manufactured by Orientec Co., Ltd.) is used, and the first joint of the first member and the second joint of the second member are used. The first joint portion of the first member and the second joint portion of the second member are pulled in opposite directions at a pulling speed of 300 mm / min. And the second fitting portion are disengaged. The maximum tensile strength until the fitting is released is defined as the inner fitting strength. When measuring the outer fitting strength, a tensilon tensile tester (Model No. “RTC-1310A”, manufactured by Orientec Co., Ltd.) is used, and the first joint of the first member and the second joint of the second member are used. The first edge side of the joint is gripped, and the first joint of the first member and the second joint of the second member are pulled in opposite directions at a pulling speed of 300 mm / min so as to be aligned, and the first fitting is performed. The mating part and the second mating part are disengaged. The maximum tensile strength until the fitting is released is defined as the outer fitting strength. The inner fitting strength is preferably 10 N or more, and the outer fitting strength is preferably 40 N or less.

  The first fitting portion 41B includes a stem 41C and a head 41D having a substantially semicircular cross section formed at the tip of the stem 41C. A first locking step is provided at the base of the head 41D. 41D1 and a second locking step 41D2 are formed. The second fitting portion 42B is composed of a first arm portion 42C and a second arm portion 42D having an arcuate cross section, and a first engaging portion protruding inward is provided at the tip of the first arm portion 42C. A stopping claw portion 42C1 is formed, and a second locking claw portion 42D1 protruding inward is formed at a tip of the second arm portion 42D.

  Between the first locking claw portion 42C1 of the second fitting portion 42B and the second locking claw portion 42D1 facing the second locking claw portion 42B, a gap having a width substantially equal to the width of the trunk portion 41C of the first fitting portion 41B is provided. The head 41D of the first fitting portion 41B fits into a recess having a substantially semicircular cross section formed by the first arm portion 42C and the second arm portion 42D of the second fitting portion 42B. It has become.

  The surface of the first locking step 41D1 facing the first locking claw 42C1 is inclined toward the second joint 42A. That is, the first locking step 41D1 and the trunk 41C are formed so as to form an obtuse angle. This weakens the hook between the first locking step 41D1 and the first locking claw 42C1, and the first locking claw 42C1 is easily detached from the first locking step 41D1. The surface of the second locking step 41D2 facing the second locking claw 42D1 is inclined toward the second joint 42A. That is, the second locking step 41D2 and the trunk 41C are formed to be at an acute angle. Further, when the first fitting portion 41B and the second fitting portion 42B are fitted, a gap is formed between the first locking step portion 41D1 and the first locking claw portion 42C1. Thereby, the hook between the second locking step 41D2 and the second locking claw 42D1 is maintained, and the second locking claw 42D1 is not easily detached from the second locking step 41D2.

<< packaging materials >>
The front films 11, 12 and the back film 13 are made of a packaging material having at least a base material layer and a sealant layer in this order. The sealant layer is a layer that forms the inner surface of the pouch 10-1. The packaging material 50 shown in FIG. 7 includes, for example, a first base layer 51, a printing layer 52, a first adhesive layer 53, a second base layer 54, a second adhesive layer 55, and a sealant layer 56 in this order. At least have. In addition, as the base material layer, at least one of the first base material layer 51 and the second base material layer 54 may be provided. The packaging material shown in FIG. 8 includes, for example, at least a first base material layer 51, a printing layer 52, a first adhesive layer 53, and a sealant layer 56 in this order. Note that the packaging material may further include a functional layer that exhibits a desired function, such as a transparent gas barrier layer, between the base material layer and the sealant layer.

<First base material layer>
The first base material layer 51 is, for example, a stretched base material layer that is stretched in a predetermined direction. The first base material layer 51 functions as a base material layer for giving the packaging material 50 a predetermined strength. The first base material layer 51 may be a uniaxially stretched film stretched in a predetermined one direction or a biaxially stretched film stretched in a predetermined two directions. The stretching direction of the first base material layer 51 is not particularly limited. For example, the first base material layer 51 may extend in a direction in which the third edge 10G extends, or may extend in a direction orthogonal to the direction in which the third edge 10G extends. The stretching ratio of the first base material layer 51 is, for example, 1.05 times or more.

  The first base material layer 51 contains, for example, polyester as a main component. For example, the first base material layer 51 contains 51% by mass or more of polyester. Examples of polyester include polyethylene terephthalate (hereinafter also referred to as PET), polybutylene terephthalate (hereinafter also referred to as PBT), and the like. In addition, the polyester of 51% by mass or more in the first base material layer 51 may be composed of one type of polyester, or may be composed of two or more types of polyester.

  When the first base material layer 51 contains polyester as a main component, the thickness of the first base material layer 51 is preferably 9 μm or more, more preferably 12 μm or more. When the first base material layer 51 contains polyester as a main component, the thickness of the first base material layer 51 is preferably 25 μm or less, more preferably 20 μm or less. By setting the thickness of the first base layer 51 to 9 μm or more, the first base layer 51 has sufficient strength. By setting the thickness of the first base layer 51 to 25 μm or less, the first base layer 51 exhibits excellent moldability. For this reason, the process of manufacturing the pouch 10-1 by processing the packaging material 50 can be efficiently performed.

  The first base material layer 51 may include polyamide as a main component. For example, the first base layer 51 contains 51% by mass or more of polyamide. Examples of polyamides include aliphatic or aromatic polyamides. Examples of the aliphatic polyamide include nylons such as nylon-6, nylon-6,6, and a copolymer of nylon-6 and nylon-6,6. As the aromatic polyamide, polymethaxylene adipamide ( MXD6). When the first base material layer 51 contains polyamide as a main component, the piercing strength of the packaging material 50 including the first base material layer 51 can be increased.

  When the first base material layer 51 contains polyamide as a main component, the thickness of the first base material layer 51 is preferably 12 μm or more, and more preferably 15 μm or more. When the first base material layer 51 contains polyamide as a main component, the thickness of the first base material layer 51 is preferably 25 μm or less, more preferably 20 μm or less.

  The first base material layer 51 may be constituted by a single layer, or may be constituted by a plurality of layers. When the first base material layer 51 includes a plurality of layers, the first base material layer 51 is, for example, a co-extrusion film manufactured by co-extrusion. The first base layer 51 produced by co-extrusion includes, for example, a first layer made of polyester such as PET, a second layer made of polyamide such as nylon, and a third layer made of polyester such as PET, which are sequentially laminated. Including layers. When the mass of the second layer made of polyamide such as nylon is 51% or more of the total mass of the first base material layer 51, the main component of the first base material layer 51 produced by co-extrusion is polyamide. It can be said that there is.

<Print layer>
The printing layer 52 is a layer containing a coloring material and a binder resin. By forming the printing layer 52, a pattern can be formed on the pouch 10-1. “Picture” in this specification is not particularly limited, and includes, for example, figures, characters, patterns, patterns, symbols, patterns, marks, and the like widely.

  The printing layer 52 may further include an optional additive. Examples of additives include a lubricant, an antiblocking agent, a filler, a curing agent, a pigment dispersant, an antifoaming agent, a leveling agent, a wax, a silane coupling agent, a preservative, an antioxidant, an ultraviolet absorber, and rust prevention. Agents, plasticizers, flame retardants, color developers and the like. These additives are used particularly for the purpose of improving printing adequacy, printing effects, and the like, and the type and amount of the additives can be appropriately selected depending on the printing method, the printing substrate, and the printing conditions. The printing layer 52 can be formed on the first base material layer 51 by a printing method such as gravure printing.

(Color material)
The coloring material is not particularly limited, and a known pigment or dye can be used, and is appropriately selected according to a desired color.

(Binder resin)
As the binder resin, for example, linseed oil, cutting oil, soybean oil, hydrocarbon oil, rosin, rosin ester, rosin modified resin, shellac, alkyd resin, phenolic resin, maleic acid resin, natural resin, hydrocarbon resin, Polyvinyl chloride resin, polyacetic acid resin, polystyrene resin, polyvinyl butyral resin, (meth) acrylic resin, polyamide resin, polyester resin, polyurethane resin, epoxy resin, urea resin, melamine resin, aminoalkyd Examples include a base resin, nitrocellulose, ethylcellulose, chlorinated rubber, cyclized rubber, a polymer of a (meth) acrylate compound, or a mixture thereof.

<First adhesive layer>
The first adhesive layer 53 includes an adhesive for bonding the first base layer 51 and the second base layer 54 by a dry lamination method. The adhesive constituting the first adhesive layer 53 is generated 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 generated by the reaction between the main agent and the solvent in the adhesive composition.

  Examples of the adhesive include polyurethane and the like. Polyurethane is a cured product generated by reacting a polyol as a main component with an isocyanate compound as a curing agent. Examples of polyurethane include polyether polyurethane, polyester polyurethane, and the like. The polyether polyurethane is a cured product generated by reacting a polyether polyol as a main component with an isocyanate compound as a curing agent. Polyester polyurethane is a cured product generated by the reaction between a polyester polyol as a main component and an isocyanate compound as a curing agent.

  Examples of the isocyanate compound include aromatic isocyanate compounds such as tolylene diisocyanate (TDI), 4,4′-diphenylmethane diisocyanate (MDI), and xylylene diisocyanate (XDI), hexamethylene diisocyanate (HDI), and isophorone diisocyanate (IPDI). Or an adduct or multimer of the above-mentioned various isocyanate compounds.

  The thickness of the first adhesive layer 53 is preferably 2 μm or more, and more preferably 3 μm or more. Further, the thickness of the first adhesive layer 53 is preferably 6 μm or less, more preferably 5 μm or less.

<Second base material layer>
The second base material layer 54 is, for example, a base material layer stretched in a predetermined direction, like the first base material layer 51. Similarly to the first base layer 51, the second base layer 54 also functions as a base layer for giving the packaging material 50 a predetermined strength. The stretching direction of the second base material layer 54 is not particularly limited as in the case of the first base material layer 51.

  The second base material layer 54 contains polyester or polyamide as a main component similarly to the first base material layer 51. In order to make the packaging material 50 have heat resistance, it is preferable that at least one of the first base layer 51 and the second base layer 54 contains polyester as a main component. Therefore, when the first base layer 51 contains polyamide as a main component, the second base layer 54 contains polyester as a main component. When the first base layer 51 includes polyester as a main component, the second base layer 54 may include polyester as a main component or polyamide as a main component.

  When the second base material layer 54 contains polyester as a main component, for example, when it contains 51% by mass or more of polyester, examples of polyester include PET and PBT as in the case of the first base material layer 51. Can be mentioned. The thickness of the second base material layer 54 is preferably 9 μm or more, more preferably 12 μm or more. When the second base material layer 54 contains polyester as a main component, the thickness of the second base material layer 54 is preferably 25 μm or less, and more preferably 20 μm or less. When the second base material layer 54 contains polyester as a main component, the second base material layer 54 has the same thermal conductivity and melting point as those of the first base material layer 51 containing polyester as a main component.

  When the second base material layer 54 contains polyamide as a main component, for example, when it contains 51% by mass or more of polyamide, examples of polyamide include aliphatic polyamide or aromatic polyamide as in the case of the first base material layer 51. Group polyamides. The thickness of the second base material layer 54 is preferably 12 μm or more, and more preferably 15 μm or more. When the second base layer 54 contains polyamide as a main component, the thickness of the second base layer 54 is preferably 25 μm or less, more preferably 20 μm or less.

<Second adhesive layer>
The second adhesive layer 55 includes an adhesive for bonding the second base material layer 54 and the sealant layer 56 by a dry lamination method. As an example of the adhesive of the second adhesive layer 55, polyurethane can be used as in the case of the first adhesive layer 53. In addition to the configuration, material, and characteristics described below, the same configuration, material, and characteristics of the second adhesive layer 55 as those of the first adhesive layer 53 can be adopted.

  The thickness of the second adhesive layer 55 is preferably 2 μm or more, more preferably 3 μm or more. Further, the thickness of the second adhesive layer 55 is preferably 6 μm or less, more preferably 5 μm or less.

  By the way, as described above, an aromatic isocyanate compound and an aliphatic isocyanate compound exist as the isocyanate compound constituting the curing agent of the adhesive. Among these, in the aromatic isocyanate compound, components that cannot be used for food use elute under a high temperature environment such as heat sterilization. Incidentally, the second adhesive layer 55 is in contact with the sealant layer 56. For this reason, when the second adhesive layer 55 contains an aromatic isocyanate compound, components eluted from the aromatic isocyanate compound adhere to the contents contained in the containing space 10A in contact with the sealant layer 56. There is. In consideration of such a problem, preferably, as an adhesive constituting the second adhesive layer 55, a cured product generated by a reaction between a polyol as a main agent and an aliphatic isocyanate compound as a curing agent Is used. Accordingly, it is possible to prevent components that cannot be used for food use due to the second adhesive layer 55 from adhering to the contents.

<Sealant layer>
Next, the sealant layer 56 will be described. As a material constituting the sealant layer 56, one or more resins selected from polyethylene and polypropylene such as low-density polyethylene and linear low-density polyethylene can be used. The sealant layer 56 may be a single layer or a multilayer. Further, the sealant layer 56 is preferably made of an unstretched film. The term “unstretched” is a concept that includes not only a film that has not been stretched at all, but also a film that has been slightly stretched due to tension applied during film formation.

  The pouch 10-1 composed of the packaging material 50 is subjected to a sterilization treatment such as a boil treatment or a retort treatment at a high temperature. Therefore, as the sealant layer 56, a material having heat resistance enough to withstand these high-temperature treatments is used.

  The melting point of the material constituting the sealant layer 56 is preferably 150 ° C. or higher, more preferably 160 ° C. or higher. By increasing the melting point of the sealant layer 56, the pouch 10-1 can be retorted at a high temperature, so that the time required for the retorting can be shortened. In addition, the melting point of the material forming the sealant layer 56 is lower than the melting point of the resin forming the first base layer 51 and the second base layer 54.

  From the viewpoint of the retort treatment, a material containing propylene as a main component can be used as a material for forming the sealant layer 56. Here, the “material containing propylene as a main component” means a material having a propylene content of 90% by mass or more. Specific examples of the material containing propylene as a main component include propylene / ethylene block copolymer, propylene / ethylene random copolymer, polypropylene such as homopolypropylene, or a mixture of polypropylene and polyethylene. Can be. Here, the “propylene / ethylene block copolymer” means a material having a structural formula represented by the following formula (1). Further, “propylene / ethylene random copolymer” means a material having a structural formula represented by the following formula (2). Further, “homopolypropylene” means a material having a structural formula represented by the following formula (3).

上記式（１）中、ｍ１、ｍ２、ｍ３は、１以上の整数を表す。

In the above formula (1), m1, m2, and m3 represent an integer of 1 or more.

上記式（２）中、ｍ、ｎは、１以上の整数を表す。

In the above formula (2), m and n represent an integer of 1 or more.

上記式（３）中、ｍは、１以上の整数を表す。

In the above formula (3), m represents an integer of 1 or more.

  When a mixture of polypropylene and polyethylene is used as the material mainly containing propylene, the material may have a sea-island structure. Here, the “sea-island structure” refers to a structure in which polyethylene is discontinuously dispersed in a region where polypropylene is continuous.

When considered from the viewpoint of boiling treatment, examples of the material constituting the sealant layer 56 include polyethylene, polypropylene, and a combination thereof. Examples of polyethylene include medium-density polyethylene, linear low-density polyethylene, and combinations thereof. For example, from the viewpoint of the above-described retort treatment, it is also possible to use the materials mentioned as the materials constituting the sealant layer 56. The material constituting the sealant layer 56 has a melting point of, for example, 100 ° C. or more, more preferably 105 ° C. or more, and still more preferably 110 ° C. or more. When polyethylene is used as the material forming the sealant layer 56, a melting point of 100 ° C. or more can be realized, for example, when the density of polyethylene is 0.920 g / cm ³ or more. Further, specific examples of the sealant layer 56 having a melting point of 100 ° C. or higher include TUX-HC manufactured by Mitsui Chemicals Tosello, L6101 manufactured by Toyobo, and LS700C manufactured by Idemitsu Unitech. Specific examples of the sealant layer 56 having a melting point of 105 ° C. or higher include NB-1 made by Tamapoly. Specific examples of the sealant layer 56 having a melting point of 110 ° C. or higher include LS760C manufactured by Idemitsu Unitech, TUX-HZ manufactured by Mitsui Chemicals Tosello.

  Preferably, the sealant layer 56 is a single layer film including a propylene / ethylene block copolymer. For example, the sealant layer 56 is a single-layer unstretched film mainly composed of a propylene / ethylene block copolymer. By using the propylene / ethylene block copolymer, the impact resistance of the sealant layer 56 can be increased, and thereby, it is possible to suppress the pouch 10-1 from being broken by an impact when dropped. . In addition, the piercing resistance of the packaging material 50 can be improved.

  Further, by using the propylene / ethylene block copolymer, the strength of the seal portion formed by the sealant layer 56 at a high temperature, for example, at 100 ° C., that is, the above-mentioned hot seal strength, at a low temperature, for example, at room temperature It is extremely small compared to the sealing strength. Since the hot seal strength is low, when heating the pouch 10-1 using a microwave oven, the steam release seal portion 31 is easily peeled, and the steam in the storage space 10A is easily released to the outside of the pouch 10-1. . For this reason, it is possible to suppress the internal pressure of the storage space 10A from becoming excessive, thereby suppressing the packaging material 50 from being damaged during heating.

  The propylene / ethylene block copolymer includes, for example, a sea component composed of polypropylene and an island component composed of an ethylene / propylene copolymer rubber component. The sea component can contribute to enhancing the blocking resistance, heat resistance, rigidity, seal strength, and the like of the propylene / ethylene block copolymer. In addition, the island component can contribute to enhancing 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 layer 56 containing the propylene / ethylene block copolymer can be adjusted.

  In the propylene / ethylene block copolymer, the mass ratio of the sea component composed of polypropylene is higher than the mass ratio of the island component composed of the ethylene / propylene copolymer rubber component. For example, in the propylene / ethylene block copolymer, the mass ratio of the sea component composed 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 layer 56 may further include 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 an α-olefin copolymer and polyethylene. The α-olefin copolymer is, for example, a 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 layer 56.

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

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

  Note that the α-olefin copolymer constituting the second thermoplastic resin of the propylene / ethylene block copolymer is not limited to the above-mentioned linear low-density polyethylene. The α-olefin copolymer means a material having a structural formula represented by the following formula (4).

Ｒ^１、Ｒ^２はいずれも、Ｈ（水素原子）、またはＣＨ_３、Ｃ_２Ｈ_５などのアルキル基である。また、ｊおよび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（４）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。

Each of R ¹ and R ² is H (hydrogen atom) or an alkyl group such as CH ₃ and C ₂ H ₅ . Also, j and k are each an integer of 1 or more. J is larger than k. That is, in the α-olefin copolymer represented by the formula (4), the structure on the left side including R ¹ is a base. R ¹ is for example H and R ² is for example C ₂ H ₅ .

  In the sealant layer 56, 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 layer 56, 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, more preferably 70% by mass or more.

  As described above, the second thermoplastic resin can contribute to increasing the impact resistance of the sealant layer 56. 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 layer 56, the mechanical properties of the sealant layer 56 can be adjusted.

  Further, the sealant layer 56 may further include an elastomer such as a thermoplastic elastomer. By using the thermoplastic elastomer, the impact resistance and the piercing resistance of the sealant layer 56 can be further improved.

  The thermoplastic elastomer is, for example, a hydrogenated styrene-based thermoplastic elastomer. The hydrogenated styrene-based thermoplastic elastomer has a structure comprising at least one polymer block A mainly composed of a vinyl aromatic compound and at least one polymer block B mainly composed of a hydrogenated conjugated diene compound. . Further, the thermoplastic elastomer may be an ethylene / α-olefin elastomer. The ethylene / α-olefin elastomer is a low-crystalline or amorphous copolymer elastomer, and is a random copolymer of 50 to 90% by mass of ethylene as a main component and α-olefin as a comonomer. is there.

  The content of the propylene / ethylene block copolymer in the sealant layer 56 is, for example, 80% by mass or more, and preferably 90% by mass or more.

  Examples of the method for producing the propylene / ethylene block copolymer include a method in which a raw material such as propylene or ethylene is polymerized using a catalyst. As the catalyst, a Ziegler-Natta type, metallocene catalyst or the like can be used.

  The thickness of the sealant layer 56 is preferably 30 μm or more, and more preferably 40 μm or more. Further, the thickness of the sealant layer 56 is preferably 100 μm or less, and more preferably 80 μm or less.

  As the type of the single-layer sealant layer 56 containing the propylene / ethylene block copolymer, there are mainly two types. The first type is a type having a high tensile modulus, such as ZK207 described later. By using the sealant layer 56 of the second type, the tearability when the consumer opens the pouch 10-1 by tearing the pouch 10-1 along the first direction D1 can be improved. The second type is a type having high tensile elongation and having impact resistance, such as ZK500 described later. The second type of sealant layer 56 preferably further has the property of low hot seal strength. Thereby, it is possible to suppress the internal pressure of the storage space 10A from becoming excessive when the pouch 10-1 is heated.

  The tensile elongation (%) at 25 ° C. of the first type sealant layer 56 in the first direction (for example, the flow direction: MD) is preferably 1100 (%) or less, more preferably 1000 (%). Or less, and may be 900 (%) or less, or 800 (%) or less. The product of the tensile elongation (%) of the first type sealant layer 56 in the first direction and the thickness (μm) of the sealant layer 56 is preferably 30,000 or more and 50,000 or less. The lower limit of this product in the first direction is more preferably 34,000 or more, 36000 or more, or 38000 or more (the larger the numerical value, the more preferable). Further, the tensile elongation (%) at 25 ° C. of the first type sealant layer 56 in a second direction (for example, vertical direction: TD) orthogonal to the first direction is preferably 1200 (%) or less. , More preferably 1100 (%) or less, and may be 1000 (%) or less, or 900 (%) or less. The product of the tensile elongation (%) of the first type sealant layer 56 in the second direction and the thickness (μm) of the sealant layer 56 is preferably 450,000 or more and 55000 or less. The lower limit of this product in the first direction is more preferably 47000 or more and 49000 or more (the larger the numerical value, the better).

  The tensile modulus (MPa) at 25 ° C. of the first type sealant layer 56 in the first direction DR1 is preferably 500 MPa or more, more preferably 600 MPa or more, 650 MPa or more, or 700 MPa or more. Is also good. Further, the product of the tensile modulus (MPa) of the first type sealant layer 56 in the first direction and the thickness (μm) of the sealant layer 56 is preferably 35,000 or more, more preferably 38,000 or more, and Preferably it is 45000 or more. Further, the tensile elastic modulus (MPa) at 25 ° C. of the sealant layer 56 in the second direction DR2 is preferably 450 MPa or more, more preferably 500 MPa or more, and may be 550 MPa or more, or 600 MPa or more. Further, the product of the tensile modulus (MPa) of the first type sealant layer 56 and the thickness (μm) of the sealant layer 56 in the second direction DR2 is preferably 28,000 or more, more preferably 30,000 or more. When the sealant layer 56 has a high tensile modulus, the tearability when opening the pouch 10-1 can be improved.

  The tensile elongation (%) at 25 ° C. of the second type sealant layer 56 in the first direction DR1 (for example, the flow direction: MD) is preferably 800% or more, more preferably 900% or more. , 1000% or more, or 1100% or more. Further, the product of the tensile elongation (%) of the second type sealant layer 56 in the first direction and the thickness (μm) of the sealant layer 56 preferably exceeds 50,000, more preferably 55,000 or more, or 60,000 or more. It may be. The tensile elongation at 25 ° C. of the sealant layer 56 in the second direction DR2 is preferably 1050% or more, and more preferably 1100% or less. Further, the product of the tensile elongation (%) of the second type sealant layer 56 and the thickness (μm) of the sealant layer 56 in the second direction DR2 is preferably more than 55000, more preferably 60,000 or more. Since the sealant layer 56 has a high tensile elongation, it is possible to prevent the pouch 10-1 from being broken due to an impact when dropped.

  The tensile modulus at 25 ° C. of the second type sealant layer 56 in the first direction DR1 is preferably 670 MPa or less, more preferably 650 MPa or less. The product of the tensile modulus (MPa) of the second type sealant layer 56 in the first direction and the thickness (μm) of the sealant layer 56 is preferably less than 35,000, and more preferably 34,000 or less. Further, the tensile modulus at 25 ° C. of the second type sealant layer 56 in the second direction DR2 is preferably 550 MPa or less, more preferably 500 MPa or less. Further, the product of the tensile modulus (MPa) of the sealant layer 56 and the thickness (μm) of the sealant layer 56 in the second direction is preferably less than 28,000, more preferably 25,000 or less.

  The tensile elongation and the tensile modulus can be measured using a tensile tester equipped with a thermostat (Model No. "RTC-1310A, manufactured by Orientec Co., Ltd.") in accordance with JIS K7127: 1999. The pouch shown in FIG. In 10-1, the direction in which the first edge 10E and the second edge 10F extend is the flow direction of the film constituting the pouch 10-1, such as the sealant layer 56, and the third edge 10G and the fourth edge 10H The extending direction is the vertical direction of the film forming the pouch 10-1, such as the sealant layer 56. Although not shown, the direction in which the first edge 10E and the second edge 10F extend is the vertical direction of the film. The pouch 10-1 may be configured such that the direction in which the third edge 10G and the fourth edge 10H extend is the film flow direction.

<Transparent gas barrier layer>
The transparent gas barrier layer is formed on the surface of the second base material layer 54 or the like, and includes at least a transparent vapor deposition layer made of a transparent inorganic material. Further, the transparent gas barrier layer may be formed on the surface of the transparent vapor deposition layer, and may further include a transparent gas barrier coating film having transparency.

  The transparent vapor-deposited layer functions as a layer having a gas barrier function of preventing permeation of oxygen gas, water vapor, and the like. Note that two or more transparent evaporation layers may be provided. When there are two or more transparent vapor-deposited layers, each may have the same composition or different compositions. Examples of the method for forming the transparent vapor-deposited layer include a physical vapor deposition method (PVD method) such as a vacuum vapor deposition method, a sputtering method, and an ion plating method; a plasma chemical vapor deposition method; Chemical vapor deposition (Chemical Vapor Deposition, CVD) such as chemical vapor deposition and photochemical vapor deposition. Specifically, a deposition layer can be formed on a deposition roller using a roller deposition film deposition apparatus. Examples of the inorganic material constituting the transparent vapor deposition layer include aluminum oxide (aluminum oxide), silicon oxide, and the like. The thickness of the transparent vapor-deposited layer is preferably from 40 ° to 130 °, more preferably from 50 ° to 120 °.

The transparent gas barrier coating film is a layer that functions as a layer that suppresses transmission of oxygen gas, water vapor, and the like. The transparent gas barrier coating film has a general formula R ³ _nM (OR ⁴ ) _m (where R ³ and R ⁴ represent an organic group having 1 to 8 carbon atoms, 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 a valence of M.) and at least one alkoxide represented by the above formula and the polyvinyl alcohol as described above. A transparent gas barrier composition containing a polyether-based resin and / or an ethylene-vinyl alcohol copolymer, and which is polycondensed by a sol-gel method in the presence of a sol-gel method catalyst, an acid, water, and an organic solvent. Can be

Specific examples of the packaging material 50 include, for example, the following packaging materials. When listing layers, "/" is used as a notation indicating a boundary between layers. The layers will be described from the outside of the pouch to the inside. That is, the layer described on the rightmost side is the sealant layer.
Stretched polyester film / printing layer / joining layer / stretched polyamide film / joining layer / sealant layer stretched polyester film / printing layer / joining layer / stretched polyester film / joining layer / sealant layer stretched polyester film / printing layer / joining layer / stretched polyamide Film / stretched polyester film / joint layer / sealant layer stretched polyester film / print layer / joint layer / stretched polyester film / joint layer / stretched polyester film / joint layer / sealant layer stretched polyester film / print layer / joint layer / stretched polyester film / Joining layer / stretched polyamide film / joining layer / sealant layer stretched polyamide film / printing layer / joining layer / sealant layer stretched polyester film / printing layer / joining layer / sealant layer

<<<< Other pouch >>>>
The pouch 10-1 shown in FIG. 1 does not include the gusset folding portion, but may include the gusset folding portion 60 on the second edge 10F side like the pouch 10-2 shown in FIG. By providing the gusset folding part 60, the pouch 10-2 can be made independent. In addition, since the accommodation space 10A can be enlarged, more contents can be accommodated. In the pouch 10-2, the first edge 10E side is open.

<Gusset insertion part>
The gusset folding part 60 includes a bottom of the front film 11, a bottom of the back film 13, and an intermediate film 61 inserted inside between the bottom of the front film 11 and the bottom of the back film 13. Have been. In addition, the positions of “up”, “down”, “side”, and “bottom” in this specification mean positions in a state where the pouch is self-standing.

  The ratio (W5 / H) of the width W6 (see FIG. 13) of the gusset folding part 60 to the height H of the pouch 10-2 is preferably 0.2 or more and 0.4 or less. When W6 / H is 0.2 or more, more contents can be accommodated, and when the pouch 10-2 is self-supported after opening, the pouch can be stably self-supported. The width W6 of the gusset fold 60 is the length of the gusset fold 60 in the second direction DR2. Specifically, it is the length from the second edge 10F to the folding line 60A. When the width of the gusset fold 60 is not constant, the width of the gusset fold is set to the shortest value. The width W5 of the gusset folding part 60 may be 15 mm or more and 50 mm or less.

  The outer edge seal portion 21 of the pouch 10-2 includes a first bottom seal portion 21E and a second bottom seal portion 21F formed on the second edge 10F side, and a bottom assist formed on the third edge 10G and the fourth edge 10H side. A seal portion 21G, a first side seal portion 21I formed on the third edge 10G side, and a second side seal portion 21J formed on the fourth edge 10H side are provided.

<First bottom seal portion and second bottom seal portion>
The first bottom seal part 21E is a part in which a part of the bottom of the front surface film 11 and a part of the intermediate film 61 in the gusset folding part 60 are joined to each other, and the second bottom sealing part 21F is a gusset folding part. In FIG. 60, a part of the bottom of the back film 13 and a part of the intermediate film 61 are joined together. The first bottom seal part 21E is formed by heat-sealing the front film 11 and the intermediate film 61, and the second bottom seal part 21F is heat-sealing the back film 13 and the intermediate film 61. It is formed by.

<Bottom auxiliary seal part>
The bottom auxiliary seal portion 21G is formed at both edges of the bottom on the first direction DR1 side. The bottom auxiliary seal portion 21G is a portion where the front film 11 and the back film 13 are joined to each other. The bottom auxiliary seal portion 21 </ b> G is formed by heat-sealing the front film 11 and the rear film 13 through the notch provided in the intermediate film 61. From the viewpoint of expanding the gusset fold when filling the content space into the accommodation space, the first bottom seal portion and the second bottom seal portion need to be separated from each other at the bottom center portion of the pouch. If the seal portion and the second bottom seal portion are completely separated from each other, the first bottom seal portion and the second bottom seal portion cannot bear the weight of the fluid when the storage space is filled with the fluid, and the first bottom seal portion and the second bottom seal portion cannot withstand the first fluid. The gap between the bottom seal portion and the second bottom seal portion is opened, and there is a possibility that the pouch becomes difficult to stand on its own. In addition, since the base material layers cannot be heat-sealed, the first bottom seal portion and the second bottom seal portion where the base material layers face each other cannot be heat-sealed as they are. Therefore, by forming the bottom auxiliary seal portion 21G, only the both end portions of the first bottom seal portion 21E and the second bottom seal portion 21F are joined. Therefore, when filling the contents, the pouch 10-2 can be stably self-supported without inhibiting the spread of the intermediate film 61.

<First side seal portion and second side seal portion>
The first side seal portion 21I and the second side seal portion 21J are portions where the front films 11, 12 and the back film 13 are joined to each other.

  The pouch 10-2 includes a chuck tape portion 70 attached to the inner surface of the pouch 10-2, and a breaking mechanism 80 for breaking the front surface film 12. The chuck tape unit 70 includes a first member 71 joined to the inner surface of the front film 12 and a second member 72 joined to the inner surface of the front film 12.

<First member and second member>
The first member 71 has a base film 71C including a first joining portion 71A, and a first fitting portion 71B extending from the third edge 10G to the fourth edge 10H. As shown in FIG. 10, the base film 71 </ b> C is a film located between the front film 12 and the back film 13 at a portion near the first edge 10 </ b> E side of the pouch 10-2. The first joint portion 71A is a portion of the base film 71C that is joined to the inner surface of the front film 12. The first fitting portion 71B is located so as not to overlap with the first joining portion 71A, and is provided in a portion of the base film 71C other than the first joining portion 71A. In the example shown in FIG. 2, the first joint portion 71A is located on the surface of the base film 71C facing the inner surface of the front film 12.

  The second member 72 has a second joint portion 72A and a second fitting portion 72B. As shown in FIG. 10, the second joint 72 </ b> A is joined to the inner surface of the front film 12. The second fitting portion 72B extends from the third edge 10G to the fourth edge 10H, and is configured to be able to fit with the first fitting portion 71B. FIG. 10 shows a state where the first fitting portion 71B and the second fitting portion 72B are fitted.

  The method for joining the first joint portion 71A and the second joint portion 72A to the inner surface of the front film 12 is not particularly limited. For example, the first bonding portion 71A, the second bonding portion 72A, and the inner surface of the front surface film 12 are melted by heating or the like, and the first bonding portion 71A and the inner surface of the front surface film 12 are welded. The portion 72A and the inner surface of the front film 12 may be joined by welding. Alternatively, the first bonding portion 71A may be bonded to the inner surface of the front film 12 using an adhesive or the like, and the second bonding portion 72A may be bonded to the inner surface of the front film 12 by bonding. .

  The base film 71 </ b> C has a surface that can be bonded to the inner surface of the front surface film 12. The base film 71C has such a thickness that it can be deformed following the deformation of the front film 12. The thickness of the base film 71C is, for example, 25 μm or less, and may be 15 μm or less. As a material constituting the base film 71C, polyethylene terephthalate (PET), stretched nylon (ONY), polybutylene terephthalate (PBT), or a polyolefin such as polyethylene (PE) or polypropylene (PP) can be used.

  Similarly to the base film 71C, the second bonding portion 72A also has a surface that can be bonded to the inner surface of the front surface film 12. Also, the second joint portion 72A has a thickness that can be deformed following the deformation of the front surface film 12. The thickness of the second joint portion 72A is, for example, 40 μm or less, and may be 30 μm or less. PP, polystyrene (PS), PE, or the like can be used as a material forming the second bonding portion 72A.

  The shapes of the first fitting portion 71B and the second fitting portion 72B are not particularly limited as long as they can be fitted to each other. Specifically, in FIG. 10, the first fitting portion 71B is a female fitting portion and the second fitting portion 72B is a male fitting portion. May be a male fitting part, and the second fitting part 72B may be a female fitting part.

  The first fitting portion 71B and the second fitting portion 72B have heat resistance that does not melt or damage the content when heated. As a material forming the first fitting portion 71B and the second fitting portion 72B, PP, PS, PE, or the like can be used. The first fitting portion 71B may be integrally formed with the base film 71C. Further, the second fitting portion 72B may be integrally formed with the second joint portion 72A. Note that “integrally” means that there is no interface such as a joint surface between the two.

  In the example shown in FIG. 10, the second fitting portion 72B overlaps the second joining portion 72A. That is, in the portion of the second member 72 that is joined to the inner surface of the front film 12, the second fitting portion 72B is provided on the back film 13 side. However, the arrangement of the second fitting portion 72B is not particularly limited as long as the space 73 described later can be formed by fitting with the first fitting portion 71B. For example, although not shown, the second fitting portion 72B may be provided in a portion of the second member 72 that is not joined to the inner surface of the front surface film 12.

  As shown in FIG. 9, the first member 71 and the second member 72 are formed so as to extend from the first side seal portion 21I to the second side seal portion 21J. Therefore, when the first fitting portion 71B and the second fitting portion 72B are fitted, a space 73 isolated from the housing space 10A is formed inside the pouch 10-2. The space 73 is surrounded by the first joint portion 71A, the base film 71C, the first fitting portion 71B, the second fitting portion 72B, the second joining portion 72A, and the front film 12.

  By having such a chuck tape portion 70, even if the filling of the contents is performed from the first edge 10E side, the chuck tape portions 70 are not stained with the contents.

<Breaking mechanism>
The breaking mechanism 80 is a component for breaking the front film 12 and forming an opening communicating with the space 73 in the front film 12. Specifically, as shown in FIG. 9, the breaking mechanism 80 breaks the front film 12 at a position between the first joint 71A and the second joint 72A to form an opening. It is a component of. Hereinafter, the opening formed by breaking the front surface film 12 is also referred to as a breaking opening. The breaking mechanism 80 shown in FIG. 9 includes a band-shaped member 81 provided from the first side seal portion 21I to the second side seal portion 21J. When the end of the band-shaped member 81 on the first side seal part 21I side is pulled toward the second side seal part 21J so as to separate the band-shaped member 81 from the pouch 10-2, the band-shaped member 81 is placed on the front surface. A shear force for tearing the front surface film 12 in the width direction of the pouch 10-2 is applied to a portion of the film 12 overlapping with the outer edge of the band-shaped member 81. Thereby, it is possible to form a break opening in the front film 12 that extends from the first side seal portion 21I side to the second side seal portion 21J side and has a width corresponding to the width of the belt-shaped member 81. it can.

  As shown in FIG. 10, the surface of the belt-shaped member 81 on the front film 12 side is joined to the inner surface of the front film 12. The surface of the breaking mechanism 80 on the back film 13 side may or may not be joined to the base film 71C of the first member 71. Even when the breaking mechanism 80 is joined to the base film 71C, the breaking mechanism 80 is separated from the base film 71C when the face film 12 is broken using the breaking mechanism 80. Note that as long as the front film 12 can be broken using the breaking mechanism 80, the surface of the breaking mechanism 80 on the front film 12 side is bonded to the inner surface of the front film 12. It may include a part that is not performed.

  As shown in FIG. 9, the breaking mechanism 80 may include a knob 82 connected to an end of the band-shaped member 81 on the first side seal 21I side. The knob 82 is disposed so as to overlap the first side seal 21I. In addition, the knob portion 82 has a shape that is easier for a consumer to grip than the band-shaped member 81. For example, the size of the tab portion 82 in the up-down direction of the pouch 10-2 is larger than the size of the band-shaped member 81 in the up-down direction of the pouch 10-2, that is, the width of the band-shaped member 81. The knob portion 82 may be configured integrally with the band-shaped member 81, or may be configured separately from the band-shaped member 81. As shown in FIG. 9, a cutout 83 that penetrates the pouch 10-2 from the front film 12 side to the back film 13 side is formed around the knob portion 82.

  As shown in FIG. 9, the back film of the pouch 10-2 is located at a position closer to the second side seal portion 21J than the knob portion 82 and overlaps the first side seal portion 21I and the breaking mechanism 80. May be formed so as to penetrate a portion from the outer surface to the surface of the breaking mechanism 80 on the back film 13 side. By separating the portion of the back film 13 or the first member 71 that is joined to the knob portion 82 from the band member 81 by a slit, the knob portion 82 and the band member 81 are pulled up to the front film 12 side or The force required to push up can be reduced. In addition, it is possible to prevent the back film 13 and the first member 71 overlapping the band-shaped member 81 from being broken when the knob 82 and the band-shaped member 81 are pulled up or pushed up to the front film 12 side. .

  PET, PS, PP, or the like can be used as a material forming the belt-shaped member 81 of the breaking mechanism 80. The thickness of the band-shaped member 81 is, for example, 100 μm or more and 800 μm or less. The width of the band-shaped member 81 (the dimension of the band-shaped member 81 in the vertical direction of the pouch 10-2) is, for example, 1 mm or more and 10 mm or less.

<< Pouch manufacturing method >>
The pouch 10-1 can be manufactured as follows. First, three packaging materials 50 to be the front films 11, 12 and the back film 13 are prepared. The packaging material to be the front surface film 12 is folded in two at a predetermined position so that the first base material layer 51 is inside. Also, a first member 41 and a second member 42 are prepared.

  Then, the first bonding portion 41A of the first member 41 is thermally fused to the inner surface of the packaging material 50 to be the front surface film 12 at a position closer to the second edge 10F than the scheduled opening position P, and bonded. I do. In addition, the second bonding portion 42A of the second member 42 is heat-sealed to the inner surface of the packaging material 50 to be the back film 13 on the second edge 10F side from the opening position P and facing the first member 41. And join. Thereafter, the folded packaging material 50 serving as the front film 12 is disposed at a predetermined position between the packaging material 50 serving as the front film 11 and the packaging material 50 serving as the back film 13, and the outer edge is formed. The seal portion 21 (except for the second outer edge seal portion 21B), the joint seal portion 22, and the region to be the steam release seal portion 31 are thermally fused and joined. Thereafter, a through-hole 32A is formed in the second unsealed portion 32 surrounded by the steam release seal portion 31.

  Then, the pouch 10-1 can be obtained by cutting the heat-sealed region according to the shape of the pouch 10-1. When accommodating the content in the pouch 10-1, the content is filled from the opening existing in the second edge 10F, and the front film 11 and the back film 13 in the second edge 10F are heat-sealed. To form the second outer edge sealing portion 21B, thereby sealing the pouch 10-1.

  When manufacturing the pouch 10-2, first, four packaging materials 50 to be the front films 11 and 12, the back film 13, and the intermediate film 61 are prepared. The packaging material that becomes the front film 12 and the intermediate film 61 is folded in two at a predetermined position so that the first base material layer 51 is inside. Further, a first member 71, a second member 72, and a breaking mechanism 80 are also prepared. The breaking mechanism 80 is detachably attached to the first member 71 at a position in contact with the first joining portion 71A of the first member 71 in advance.

  Then, the first fitting portion 71B and the second fitting portion 72B are arranged on the inner surface of the packaging material 50 to be the front surface film 12 such that the first fitting portion 71B and the second fitting portion 72B are closer to the second edge 10F than the breaking position which is the opening position. The first joint 71A of the first member 71 and the second joint 72A of the second member 72 are joined by heat fusion. Then, the folded packaging material 50 serving as the front film 12 is disposed between the packaging material 50 serving as the front film 11 and the packaging material 50 serving as the back film 13, and the front is also arranged. At the bottom between the packaging material 50 to be the surface film 11 and the packaging material 50 to be the back film 13, a packaging material to be the folded intermediate film 61 is arranged. Then, the outer edge seal portion 21 (excluding the first outer edge seal portion 21A), the joint seal portion 22, and the region to be the steam release seal portion 31 are heat-sealed and joined. Thereafter, a through-hole 32A is formed in the second unsealed portion 32 surrounded by the steam release seal portion 31.

  Then, the pouch 10-2 can be obtained by cutting the heat-sealed region according to the shape of the pouch 10-2. When accommodating the content in the pouch 10-2, the content is filled from the opening existing in the first edge 10E, and the front surface film 12 and the back surface film 13 in the first edge 10E are thermally fused. To form an upper seal portion to seal the pouch 10-2.

<< How to use pouch >>
The pouch 10-1 can be used, for example, as follows. Here, it is assumed that the first content such as a liquid seasoning is previously sealed in the pouch 10-1. First, the consumer opens the pouch 10-1 from the opening start means 15. Then, the first fitting portion 41B and the second fitting portion 42B of the opened pouch 10-1 are disengaged, and the second content is put into the pouch 10-1. Thereafter, the first content and the second content are mixed by shaking or kneading the pouch 10-1. Then, the pouch 10-1 is placed in a microwave oven in a state where the back surface 10C is on the lower side and cooked by heating.

  The pouch 10-2 can be used in the same procedure as the pouch 10-1. When the pouch 10-2 is placed in a microwave, the pouch 10-2 is placed in a microwave with the back side 10C facing down.

  When the pouches 10-1 and 10-2 are placed in a microwave oven and heated, the pressure in the housing space 10A increases, so that the front surface 10B and the back surface 10C expand outward due to the force received from the housing space 10A. According to the embodiment, since the vapor release seal portion 31 is provided, the vapor can be released from the vapor release seal portion 31 without opening the chuck tape portion 40. Thereby, the cooking can be performed with the pouches 10-1 and 10-2 laid on their sides.

  In the present embodiment, since the pressure in the storage space 10A is 130 kPa or less and the steam is released due to the peeling of the vapor release seal portion 31, the pressure in the storage space is 130 kPa or before the vapor release seal portion 31 is released. Peels off. Therefore, the pressure in the housing space 10A does not excessively increase due to the heating in the microwave oven, whereby the steam can be stably discharged from the steam release seal portion 31.

  When the length of the second content is longer than the width of the pouch storage space, specifically, in the first direction DR1 of the pouch 10-1, the length of the storage space of the pouch 10-1 is maximum. And a first virtual line IL (see FIG. 4) drawn so as to have a minimum distance when passing through the center O of the second content C2 and connecting the outer surfaces of the second content C2. A second imaginary line IL (see FIG. 12) drawn so as to pass through the center of the second content C2 in the direction orthogonal to the direction perpendicular to the second content C2 and to have a maximum distance when connecting the outer surfaces of the second content C2. When the length of L (see FIG. 12) satisfies the relationship of L> W5, if the second content having such a size is accommodated in a self-supporting pouch, the first content is obtained. Accumulates at the bottom, so that the top of the second content may not contact the first contentOn the other hand, according to the present embodiment, even if the second contents C2 of such a size are stored in the pouches 10-1 and 10-2, the pouches 10-1 and 10-2 are laid down. Since the state can be cooked by heating, the second content C2 can be uniformly contacted with the first content C1. Thus, even with the second content C2 having such a size, the cooking can be performed without unevenness in taste.

  EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.

<Example 1>
In Example 1, the planar pouch shown in FIG. 1 was produced. First, three packaging materials were prepared. Three packaging materials were obtained as follows. First, a stretched polyethylene terephthalate film (PET film) having a thickness of 12 μm was prepared as a first base material layer. Further, a stretched PET film having a thickness of 12 μm was prepared as the second base material layer. In addition, a sealant film made of an unstretched polypropylene film (product name “ZK207”, manufactured by Toray Film Processing Co., Ltd.) was prepared. ZK207 contains the above-mentioned propylene / ethylene block copolymer. The thickness of the sealant film was 70 μm.

  ZK207 has a lower tensile elongation than ZK500. Specifically, the tensile elongation of ZK207 in the machine direction (MD) is 790% when the thickness is 50 μm, and 730% when the thickness is 60 μm. Further, the tensile elongation of ZK207 in the vertical direction (TD) is 1020% when the thickness is 50 μm, and 870% when the thickness is 60 μm. Therefore, the product of the tensile elongation (%) and the thickness (μm) of ZK207 in the flow direction is 39500 when the thickness is 50 μm and 43800 when the thickness is 60 μm. The product of the tensile elongation (%) and the thickness (μm) of ZK207 in the vertical direction is 51000 when the thickness is 50 μm and 52200 when the thickness is 60 μm.

  ZK207 has a high tensile modulus. Specifically, the tensile modulus of the ZK207 in the machine direction (MD) is 780 MPa when the thickness is 50 μm, and 680 MPa when the thickness is 60 μm. The tensile modulus of the ZK207 in the vertical direction (TD) is 630 MPa when the thickness is 50 μm, and 560 MPa when the thickness is 60 μm. Therefore, the product of the tensile modulus (MPa) and the thickness (μm) of ZK207 in the flow direction is 39000 when the thickness is 50 μm and 40800 when the thickness is 60 μm. The product of the tensile modulus (MPa) and the thickness (μm) of ZK207 in the vertical direction is 31500 when the thickness is 50 μm and 33600 when the thickness is 60 μm.

  Subsequently, the first base material layer, the first adhesive layer, the second base material layer, the second adhesive layer, and the sealant film were laminated by a dry lamination method to prepare a packaging material. As the first adhesive layer and the second adhesive layer, a two-pack type polyurethane adhesive (main agent: RU-40, curing agent: H-4) manufactured by Rock Paint Co., Ltd. was used. In addition, RU-40 of the main agent is a polyester polyol. The thickness of the first adhesive layer and the second adhesive layer was 3.5 μm.

  On the other hand, a zipper tape including the first member and the second member was prepared. The first member was a male member having a first joining portion and a first fitting portion as shown in FIG. The first joining portion was composed of a first layer and a second layer closer to the first fitting portion than the first layer. The second layer and the first fitting portion of the first joint are made of linear low density polyethylene (LLDPE), and the first layer of the first joint is made of a copolymer of linear low density polyethylene and polypropylene. It was. The second member was a female member having a second fitting portion and a second fitting portion capable of fitting with the first fitting portion as shown in FIG. The second joint portion was composed of the first layer and the second layer closer to the second fitting portion than the first layer. The second layer and the second fitting of the second joint are made of linear low-density polyethylene (LLDPE), and the first layer of the second joint is made of a copolymer of linear low-density polyethylene and polypropylene. It was.

  Then, the first joining portion of the first member was heat-sealed to the inner surface of the packaging material to be the front surface film at a position closer to the second edge than the scheduled opening position to join the first member. Further, the second joining portion of the second member was heat-sealed to the inner surface of the packaging material to be the back film at a position closer to the second edge than the scheduled opening position to join the second member.

  The folded packaging material to be the front film is disposed at a predetermined position between the packaging material to be the front film and the packaging material to be the back film, and the outer edge sealing portion (the second outer edge is provided). Except for the seal portion), the regions to be the joint seal portion and the steam release seal portion were heat-sealed and joined. Thereafter, a through hole was formed in the second unsealed portion surrounded by the steam release seal portion.

  Then, the pouch was manufactured by cutting the heat-sealed area according to the shape of the pouch. In the pouch, the length of the pouch in the first direction DR1 is 140 mm, the length of the second direction DR2 is 180 mm, the width W1 is 20 mm, the width W2 is 8 mm, and the width W3 is 9 mm. And the width W4 was 2.5 mm. The dimensions of W1 to W4 are as shown in FIG.

<Example 2>
In Example 2, a pouch was obtained in the same manner as in Example 1, except that an unstretched polypropylene film (product name “ZK500”, Toray Film Processing Co., Ltd.) having a thickness of 60 μm was used as the sealant layer. . ZK500 contained a propylene / ethylene block copolymer and an elastomer.

  ZK500 has a higher tensile elongation than a general unstretched polypropylene film. Specifically, the tensile elongation of ZK500 in the machine direction (MD) is 1180% when the thickness is 50 μm and 1100% when the thickness is 60 μm. The tensile elongation of the ZK500 in the vertical direction (TD) is 1240% when the thickness is 50 μm, and 1150% when the thickness is 60 μm. Therefore, the product of the tensile elongation (%) and the thickness (μm) of ZK500 in the flow direction is 59000 when the thickness is 50 μm and 66000 when the thickness is 60 μm. The product of the tensile elongation (%) and the thickness (μm) of the ZK500 in the vertical direction is 62,000 when the thickness is 50 μm and 69000 when the thickness is 60 μm.

<Measurement of seal strength of seal part>
The inner surfaces of the two packaging materials used in Example 1 were heat-sealed at 170 ° C. to form a seal portion. Further, the two packaging materials used in Example 2 were heat-sealed at 170 ° C. to form a seal portion. Subsequently, a portion including the seal portion was cut out to prepare a test piece having a width of 15 mm for measuring the seal strength. Here, a plurality of test pieces before the retort treatment and a plurality of test pieces after the retort treatment were prepared. The retort treatment was performed under the following conditions. Then, using the test piece before the retort treatment, the room temperature sealing strength and the hot sealing strength were measured.
・ Heating temperature: 121 ° C
・ Heating time: 40 minutes ・ Pressure: 0.2 MPa

  The room-temperature sealing strength and the hot sealing strength were measured using a tensile tester equipped with a thermostatic chamber (model number “RTC-1310A”, manufactured by Orientec Co., Ltd.) in accordance with JIS Z1707: 1997 7.5. It was measured. First, each of the two packaging materials in the unsealed portion of the test piece was gripped by a gripper of a measuring instrument. In addition, each of the grips was pulled at a speed of 300 mm / min in directions perpendicular to the surface direction of the seal portion of the test piece, and the maximum value of the tensile stress was measured. The average of the maximum values was defined as the seal strength. The distance between the grips at the start of the pull was 20 mm, and the distance between the grips at the end of the pull was 40 mm. When measuring the room temperature seal strength, the environment at the time of the measurement was a temperature of 25 ° C. and a relative humidity of 50%. When measuring the hot seal strength, the environment at the time of the measurement was, for example, a temperature of 100 ° C. and a relative humidity of 50%.

<Steam release pressure measurement and steam release evaluation>
In each of the pouches according to Examples 1 and 2, steam loss when heated in a microwave oven with water filled was measured. First, in the pouches according to Examples 1 and 2, 100 ml of water was filled inside from the opening at the second edge, and a sensor of a data logger (product name “PicoVACQ PT”, manufactured by TMI-ORION) was filled inside the pouch. ) Was placed. Then, the second edge of the pouch was heat-sealed to form a second outer edge sealing portion, and the pouch was sealed. Next, the pouch was placed in a microwave oven (output number: NE-MS261, manufactured by Panasonic) with a power of 500 W with the back surface of the pouch facing down, and heated. At this time, the pressure in the housing space was measured every second using a sensor. Then, the vapor release pressure, which was the pressure immediately before the vapor was released from the accommodation space, was measured. In addition, it was evaluated whether or not steam was automatically released from the steam release seal portion. The evaluation criteria were as follows.
：: The steam release seal part peeled off, and the steam normally escaped.
X: The vapor escaped from the other part without peeling off the vapor release seal part.

The evaluation results are shown in Table 1 below.

  Hereinafter, the results will be described. As shown in Table 1, in the pouches according to Examples 1 and 2, the steam release seal portion was peeled off, and the steam normally escaped. In the pouches according to Examples 1 and 2, the pressure at the time when steam was released was 130 kPa or less.

Reference Signs List 10 pouch 10A accommodation space 10B front surface 10C back surface 10D outer edge 10E first edge 10F second edge 10G third edge 10E fourth edge 11, 12 front film 13 Back film 14 ... Joint part 20 ... Seal part 21 ... Outer edge seal part 22 ... Joint seal part 30 ... Steam release mechanism 31 ... Steam release seal part 32 ... Second unsealed parts 40 and 70 ... Chuck tape parts 41 and 71 ... 1 member 41A, 71A first joining portion 41B, 71B first fitting portion 42, 72 second member 42A, 72A second joining portion 42B, 72B second fitting portion 50 packaging material 51 first 1 base material layer 54 second base material layer 56 sealant layer

Claims (11)

Front surface film constituting the front surface, including the back film constituting the back surface, a pouch having an accommodation space,
A first edge, a second edge facing the first edge, third and fourth edges extending between the first edge and the second edge, and a sealing portion for sealing the pouch. Prepared,
The front film and the back film include at least a substrate layer and a sealant layer,
On the front surface, a joint part is provided,
The joint portion is provided from the third edge to the fourth edge,
An outer edge seal portion located at an outer edge of the pouch and extending along the outer edge; a two-sided seal portion provided on the two-sided portion; A steam vent seal configured to peel off due to an increase in
A first member having a first fitting portion extending from the third edge to the four edges is joined to an inner surface of the front surface film,
A second member extending from the third edge to the fourth edge and having a second fitting portion engageable with the first fitting portion is joined to an inner surface of the back film or the front surface film. Has been
The pouch, wherein the first fitting portion and the second fitting portion are located on the second edge side from a scheduled opening position.   2. The pouch according to claim 1, wherein the pouch is configured to release steam when the pressure in the storage space is 130 kPa or less by peeling of the steam release seal portion. 3.   3. The pouch according to claim 1, wherein the pouch is configured such that when the pressure in the storage space is equal to or higher than 110 kPa, the vapor escapes due to peeling of the vapor release seal portion. 4.   The product of the tensile elongation (%) in the first direction of the sealant layer and the thickness (μm) is 30,000 or more and 50,000 or less, and the tensile elongation (%) of the sealant layer in the second direction orthogonal to the first direction. The pouch according to any one of claims 1 to 3, wherein a product of the thickness (μm) and the thickness is 45,000 or more and 55000 or less.   The product of the tensile elongation (%) and the thickness (μm) in the first direction of the sealant layer exceeds 50,000, and the tensile elongation (%) and the thickness of the sealant layer in a second direction orthogonal to the first direction The pouch according to any one of claims 1 to 3, wherein the product of (μm) exceeds 55000.   The pouch according to any one of claims 1 to 5, wherein a seal strength of the seal portion at 25 ° C is 30N or more and 60N or less, and a seal strength of the seal portion at 100 ° C is 23N or less.   The pouch according to any one of claims 1 to 6, wherein the sealant layer includes a propylene / ethylene block copolymer.   The pouch of claim 7, wherein the sealant layer further comprises an elastomer.   The pouch according to any one of claims 1 to 8, wherein the front surface and the back film on the second edge side are joined.   On the second edge side, further comprising an intermediate film provided between the front film and the back film, and including at least a base material layer and a sealant layer, the front film, the back film and The pouch according to any one of claims 1 to 9, wherein a gusset portion is provided by the intermediate film. The pouch according to any one of claims 1 to 10, wherein a content is stored in the storage space of the pouch.

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