JP2019034763A - Steam-passing type flat pouch - Google Patents

Abstract

To provide a steam-passing type flat pouch in which content is less likely to leak when steam is discharged.SOLUTION: A steam-passing type flat pouch 10 includes: a sealing part 30 for sealing sheets 20 superimposed so as to form a housing space 10C; a steam-passing sealing part 60 for joining a part of the sheet in an inner part 23 of the sheet; and a steam discharging part 70 formed in the steam-passing sealing part 60 such that the housing space 10C and the outside do not communicate with each other in a state in which the steam-passing sealing part 60 is not peeled off and that the housing space 10C and the outside communicate with each other in a state in which the steam-passing sealing part 60 is peeled off. The steam-passing sealing part 60 includes, as pressure in the housing space 10C rises, a preceding peeling part 61 including a part to be peeled off first in the steam-passing sealing part 60 and a succeeding peeling part 62 including a part to be peeled off last in the steam-passing sealing part 60. The succeeding peeling part 62 is a part where the sheet 20 is bonded weakly than the preceding peeling part 61, and at least a part of the steam discharging part 70 is disposed at the succeeding peeling part 62.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a steaming type flat pouch.

  A steaming type flat pouch that discharges water vapor generated from the contents by heating to the outside is known. Patent Document 1 discloses an example of a conventional steaming type flat pouch. As shown in FIG. 10, the steam-through flat pouch (100) of Patent Document 1 closes the laminate (150) that forms the accommodation space (110) in which the contents are accommodated, and the accommodation space (110). In this way, a heat welding part (120) is provided to which the laminate (150) is joined. The heat-welded part (120) is formed so as to protrude from the outer peripheral part (121) corresponding to the outer shape of the steam-permeable flat pouch (100) toward the accommodation space (110) side from the outer peripheral part (121). It is divided into an overhang part (130). The portion surrounded by the outer peripheral portion (121) and the overhang portion (130) is connected to the outside of the steam-permeable flat pouch (100) in a state where the accommodation space (110) is closed by the heat welding portion (120). A communicating notch (140) is formed. In a state where the overhang portion (130) joins the laminate (150), the space between the accommodation space (110) and the notch (140) is closed by the overhang portion (130). Does not move to the notch (140).

  When the steam-through flat pouch (100) is heated by heating means such as a microwave oven, the pressure of the accommodation space (110) is increased by water vapor generated from the contents, and the overhanging portion (130) is peeled off. The acting force is applied to the overhang portion (130). When the pressure in the housing space (110) rises to a certain level, a part of the overhanging part (130) is peeled off as shown in FIG. 120) towards the outer periphery (121). As shown in FIG. 12, when the peeling of the overhanging portion (130) reaches the notch (140), the housing space (110) and the outside of the steaming flat pouch (100) are connected via the notch (140). The water vapor in the accommodation space (110) is discharged to the outside through the notch (140).

Japanese Patent Laid-Open No. 11-208739

  According to the above-described steaming-type flat pouch (100), in the state where the accommodation space (110) and the outside of the steaming-type flat pouch (100) communicate with each other through the notch (140), The upper laminated body (151) and the lower laminated body (152) are connected to each other in the heat welded portion (120), which is a part of the portion where the notch (140) is formed. For this reason, when the distance between the notch (140) and the content is short and water vapor is discharged from the notch (140), the content may leak from the notch (140) together with the water vapor.

(1) A steam-through flat pouch according to the present invention includes a seal portion that seals stacked sheets so that an accommodation space for accommodating contents is formed, and a portion inside the seal portion of the sheet. The steaming seal part for joining a part of the sheet in the inner part, and the steaming seal part so as not to communicate the housing space and the outside in a state where the steaming seal part is not peeled off A vapor discharge portion formed in the vapor seal portion so as to communicate the housing space with the outside in a peeled state, the vapor seal portion being in contact with an increase in pressure in the housing space. A preceding peeling portion including a portion to be peeled first in the portion, and a trailing peeling portion including a portion to be finally peeled in the steaming seal portion, wherein the trailing peeling portion is more than the preceding peeling portion than the preceding peeling portion. Is bonded portion weakened, at least a portion of the steam discharge portion is provided at the trailing peeling unit.
In the case where the steaming type flat pouch in which the accommodation space is closed by the seal portion is heated by the heating means, in one example, one of the stacked sheets is positioned below and the other of the stacked sheets is steam. The sheet on which the discharge portion is formed is set so as to be positioned above. When the steaming flat pouch is heated in this state, the pressure in the accommodation space is increased by the steam generated from the contents, and a force acting to peel the steaming seal part is applied to the steaming seal part. When the pressure in the housing space rises to a certain level, peeling of the steaming seal portion starts from the preceding peeling portion, and peeling of the steaming seal portion proceeds toward the trailing peeling portion. When the peeling of the steaming seal part reaches the steam discharge part, the storage space communicates with the outside through the steam discharge part, so that the water vapor in the storage space is discharged to the outside through the steam discharge part. For this reason, the rise of the pressure of an accommodation space is suppressed and the force which acts so that a vapor-permeable seal part may be peeled falls. However, since the trailing peeling portion is a portion where the sheet is joined weaker than the preceding peeling portion, it is difficult to cause a situation where the peeling of the vapor-sealed seal portion stops before the end of the trailing peeling portion. When the peeling of the steaming seal part reaches the end of the trailing peeling part, the part joined by the steaming seal part of the upper sheet is moved upward so that it is separated from the lower sheet and contents. Moving. In the above-described steaming-type flat pouch, the steaming seal part is formed in the inner part, and the steam discharge part is formed in the steaming seal part, so that the steam discharge as the upper sheet moves upward. The part also moves upward so as to be away from the lower sheet and contents. For this reason, the contents are less likely to leak during the discharge of water vapor.

(2) In a preferred example, in the steam-through flat pouch described in (1), the steam discharge portion includes a notch or a hole penetrating one of the stacked sheets, and extends in the advancing direction of the peeling. Is formed.
In the state where the peeling of the vapor-permeable seal portion does not reach the hole or the cut of the vapor discharge portion, the hole or the cut does not communicate the housing space with the outside. In the state where the peeling of the vapor-sealed seal portion has reached the hole or notch, the hole or notch communicates with the accommodation space and the outside, and the area of the portion that directly communicates with the accommodation space at the hole or incision as the peeling proceeds (hereinafter referred to as the area) "Communication area") expands. Since the steam-type flat pouch is formed so that the holes or cuts extend in the peeling progress direction, the communication area gradually increases as the peeling progresses. For this reason, it is suppressed that the flow volume of the water vapor | steam discharged | emitted outside from accommodation space increases rapidly, and peeling of a vapor-permeable seal part tends to reach the edge part of a subsequent peeling part.

(3) In a preferred example, in the steam-through flat pouch described in (1) or (2), the seat and a part of the seal portion are separated to open the accommodation space closed by the seal portion. The vapour-sealing seal portion is provided in a portion of the sheet that is separated by the guide portion.
For this reason, when the portion of the sheet that is separated by the guide portion (hereinafter referred to as “separation portion”) is separated, the steam discharge portion does not remain in the portion of the sheet that contains the content, and the content is When taken out from the storage space, the contents do not leak from the steam discharge section.

(4) In a preferred example, in the steaming type flat pouch according to any one of (1) to (3), the steaming seal portion is a portion joined by sealing the sheet, The ratio of the sealing strength of the subsequent peeling portion to the sealing strength of the preceding peeling portion is 25% or more.
When the ratio of the sealing strength of the trailing peeling portion to the sealing strength of the preceding peeling portion is included in the above range, the trailing peeling portion peels even if force is applied to the trailing peeling portion in the process of transporting the vaporized flat pouch. Hateful.

(5) In a preferred example, in the steaming flat pouch according to any one of (1) to (4), the steaming seal portion is a portion joined by sealing the sheet, The ratio of the sealing strength of the subsequent peeling portion to the sealing strength of the preceding peeling portion is 75% or less.
When the ratio of the sealing strength of the subsequent peeling portion to the sealing strength of the preceding peeling portion is included in the above range, the peeling of the subsequent peeling portion proceeds following the peeling of the preceding peeling portion when the pressure of the accommodation space increases. It's easy to do.

  (6) In a preferred example, in the steam-through flat pouch according to any one of (1) to (5), the contents stored in the storage space are further provided.

  According to the steam-through flat pouch according to the present invention, the contents are less likely to leak when water vapor is discharged.

The front view of the steaming type | mold flat pouch of embodiment. FIG. 2 is an enlarged view of a steaming seal portion in FIG. 1 and its surroundings. The front view of the steaming type | mold flat pouch before an opening part is closed. FIG. 2 is a front view of a steaming type flat pouch in a state where a part of the steaming seal portion of FIG. FIG. 5 is a front view of a steaming type flat pouch in a state where the whole steaming seal part of FIG. 4 is peeled off. Sectional drawing which follows the D6-D6 line | wire of FIG. The table | surface which shows the test condition of the comparative example regarding an examination, and an Example. The table | surface which shows the test result of a comparative example and an Example. The enlarged view of the steaming seal part of a modification, and its periphery. The front view of the conventional steaming type flat pouch. Sectional drawing which follows the D11-D11 line | wire of FIG. Sectional drawing of the state which the overhang | projection part of FIG. 12 peeled.

(Embodiment)
FIG. 1 shows an example of a steaming type flat pouch 10 that can accommodate the contents C suitable for heating and discharge the water vapor generated from the contents C. The contents C generate water vapor when heated. An example of the contents C is food. An example of food is food that is cooked. One example is beef bowl, hamburger and stew. The steam-through flat pouch 10 is configured to be stored for a long time while maintaining the quality of the contents C.

  The vapor transmission type flat pouch 10 includes a sheet 20, a seal part 30, an opening 40 (see FIG. 3), a guide part 50, a vaporization seal part 60, and a steam discharge part 70. The dots in FIG. 1 and the like represent the seal part 30 and the steaming seal part 60. The sheet 20 includes a first sheet 21 and a second sheet 22. The first sheet 21 and the second sheet 22 oppose each other so that an accommodation space 10 </ b> C for accommodating the contents C is formed between the sheets 21 and 22. The configuration of the sheet 20 can be arbitrarily selected. In the first example, the sheets 21 and 22 are two sheets formed individually. In the second example, the opposing sheets 21 and 22 are formed by bending one sheet.

  The sheet 20 has a layer structure in which a plurality of layers are stacked. The layer structure of the sheet 20 can be arbitrarily selected. In the first example, the sheets 21 and 22 have the same layer structure. In the second example, the first sheet 21 and the second sheet 22 have different layer structures. FIG. 1 shows a steam-through flat pouch 10 constituted by a sheet 20 having the layer structure of the first example.

  Each sheet 21, 22 includes an outermost layer, an intermediate layer, and an innermost layer. An example of a method for manufacturing the sheets 21 and 22 is dry lamination. The outermost layer is mainly excellent in gloss, printability and retort resistance. An example of the material constituting the outermost layer is a transparent material. An example of a transparent material is polyethylene terephthalate. The intermediate layer is mainly excellent in retort resistance, moisture resistance, and gas barrier properties. The intermediate layer includes a printing layer, a first adhesive layer, a stretched nylon layer, and a second adhesive layer. The printing layer is provided inside the outermost layer. In one example, a picture and a text for product description are printed on the outer surface of the printing layer. The first adhesive layer is provided inside the printing layer. The stretched nylon layer is provided inside the first adhesive layer. The second adhesive layer is provided inside the stretched nylon layer. An example of the material constituting each adhesive layer is a dry laminate adhesive. The innermost layer is excellent in retort resistance, heat sealability, and impact resistance. The innermost layer is provided inside the second adhesive layer. An example of the material constituting the innermost layer is unstretched polypropylene.

  The seal portion 30 joins the sheets 21 and 22 so that the sheets 21 and 22 are not separated. In one example, the seal part 30 joins the innermost layer of the first sheet 21 and the innermost layer of the second sheet 22. An example of a method for forming the seal portion 30 is heat sealing. The outer shape of the steam-through flat pouch 10 in front view can be arbitrarily selected. In the example shown in FIG. 1, the outer shape of the steaming type flat pouch 10 is a rectangle. The sheet 20 can be divided into a portion surrounded by the seal portion 30 (hereinafter “inward portion 23”) and the seal portion 30. The storage space 10 </ b> C is a space surrounded by the inner portion 23 of the first sheet 21 and the inner portion 23 of the second sheet 22, and is closed by the seal portion 30 so as not to communicate with the outside of the steaming flat pouch 10. It has been.

  The seal portion 30 joins the first sheet 21 and the second sheet 22 so that the accommodation space 10C is closed. The seal part 30 is divided into a first seal part 31 to a fourth seal part 34. The first seal portion 31 is formed along the first side 20 </ b> A of the sheet 20. The second seal portion 32 is formed along the second side 20 </ b> B of the sheet 20. The third seal portion 33 is formed along the third side 20 </ b> C of the sheet 20. The fourth seal portion 34 is formed along the fourth side 20D of the sheet 20. The 1st seal part 31, the 3rd seal part 33, and the 4th seal part 34 are formed ahead of the 2nd seal part 32 in order to store the contents in storage space 10C. In a state where the first seal portion 31, the third seal portion 33, and the fourth seal portion 34 are formed and the second seal portion 32 is not formed, an opening 40 for introducing the contents into the accommodation space 10C. (See FIG. 3) is formed in the steam-through flat pouch 10. The second seal portion 32 is formed after the contents are put into the accommodation space 10 </ b> C, and the opening 40 is closed by the second seal portion 32. Hereinafter, the direction along the first side 20A and the second side 20B in the front view of the steam-permeable flat pouch 10 is referred to as a first direction, and the direction along the third side 20C and the fourth side 20D is referred to as a second direction. .

  An inner edge 31A that is an edge on the inner portion 23 side in the first seal portion 31, an inner edge 32A that is an edge on the inner portion 23 side in the second seal portion 32, and an edge on the inner portion 23 side in the third seal portion 33. An inner edge 33 </ b> A and an inner edge 34 </ b> A that is an edge of the fourth seal portion 34 on the inner portion 23 side define an outer shape of the inner portion 23. The outer edge 31B which is the edge opposite to the inner edge 31A in the first seal part 31, the outer edge 32B which is the edge opposite to the inner edge 32A in the second seal part 32, and the opposite side from the inner edge 33A in the third seal part 33 The outer edge 33 </ b> B that is the edge of the steam-permeable flat pouch 10 and the outer edge 34 </ b> B that is the edge opposite to the inner edge 34 </ b> A in the fourth seal portion 34 define the outer shape of the steam-permeable flat pouch 10.

  The width of each seal part 31-34 can be selected arbitrarily. The width of each seal part 31-34 is the length between inner edge 31A-34A and the outer edges 31B-34B in the normal line of the centerline of each seal part 31-34. The center lines of the seal portions 31 to 34 are virtual line segments that pass between the inner edges 31A to 34A and the outer edges 31B to 34B. When the width of each seal part 31-34 differs for every site | part, for example, the maximum width or the average of the width | variety of the some site | part in each of each seal part 31-34 represents the width | variety of the seal | sticker part.

  It is preferable that the dimension in the first direction and the dimension in the second direction of the steam-through flat pouch 10 are determined, for example, from the relationship between the amount of the contents C to be accommodated and the ease of carrying the steam-through flat pouch 10. . The dimension in the first direction of the steam-permeable flat pouch 10 is the length between the outer edge 33B of the third seal portion 33 and the outer edge 34B of the fourth seal portion 34 in a line segment orthogonal to the second direction. When the dimension in the first direction of the steam-through flat pouch 10 is different for each part, for example, the maximum dimension or the average of the dimensions of the plurality of parts represents the dimension in the first direction of the steam-through flat pouch 10. According to an example, the dimension in the first direction of the steam-through flat pouch 10 is 130 mm. The dimension in the second direction of the steam-permeable flat pouch 10 is the length between the outer edge 31B of the first seal portion 31 and the outer edge 32B of the second seal portion 32 in a line segment orthogonal to the first direction. When the dimension in the second direction of the steam-permeable flat pouch 10 is different for each part, for example, the maximum dimension or the average of the dimensions of the plurality of parts represents the dimension in the second direction of the steam-through flat pouch 10. According to an example, the dimension in the second direction of the steam-through flat pouch 10 is 135 mm.

  The opening 40 (see FIG. 3) is formed between the lower portion 21A of the first sheet 21 and the lower portion 22A of the second sheet 22 so that the contents C can be filled into the accommodation space 10C. In the steam-through flat pouch 10 shown in FIG. 1, the opening 40 is closed by the second seal portion 32. The steaming flat pouch 10 with the opening 40 closed (hereinafter referred to as “the steaming flat pouch 10 after closing”) includes a pouch body 10A and a separating part 10B. The pouch body 10 </ b> A and the separating part 10 </ b> B are separated by a cut line 51 that constitutes the guide part 50. The pouch main body 10 </ b> A is a part that accommodates the contents C. The separation part 10B is a part of each sheet 21 and 22 including the first seal part 31, and is a part where the user separates from the pouch body 10A in order to take out the contents C from the accommodation space 10C.

  The guide part 50 is formed between the pouch body 10A and the separation part 10B so that the sheets 21 and 22 can be easily cut when the separation part 10B is separated from the pouch body 10A. The guide unit 50 includes a cut line 51 and a notch 52. The cut line 51 is a set of perforations formed in the inner portions 23 of the seal portions 33 and 34 and the sheets 21 and 22, and is formed in a straight line. The notch 52 is formed in at least one of the third seal portion 33 and the fourth seal portion 34 so that the tip end portion of the notch 52 is located on the imaginary line obtained by extending the cut line 51. FIG. 1 shows an example in which a notch 52 is formed in each of the third seal portion 33 and the fourth seal portion 34.

  The steaming flat pouch 10 is heated by heating means in order to heat the contents C. An example of the heating means is a microwave oven. Steam is generated from the contents C as the steam-through flat pouch 10 is heated. Since the storage space 10C is closed by the seal portion 30 in the closed steam-permeable flat pouch 10, the pressure in the storage space 10C increases with the generation of water vapor.

  The steaming seal portion 60 is a portion where the innermost layer of the first sheet 21 and the innermost layer of the second sheet 22 are joined in the inner portion 23, and is configured to peel off as the pressure in the accommodation space 10C increases. ing. In a preferred example, the vapor-permeable seal portion 60 is configured to peel when the pressure in the accommodation space 10C rises to a pressure within a predetermined pressure range. The steam discharge unit 70 communicates the housing space 10 </ b> C with the outside of the steaming flat pouch 10 when the steaming seal unit 60 is peeled off, and discharges steam generated from the contents C to the outside of the steaming flat pouch 10. To do. By discharging the water vapor from the steam discharge unit 70, an increase in the pressure of the accommodation space 10C is suppressed, and the rupture of the steam-permeable flat pouch 10 is avoided. The steam discharge part 70 is provided inside the outer shell of the vapor-permeable seal part 60.

  The vapor transmission seal part 60 is provided so as to be connected to the seal part 30. Since the vapor-permeable seal part 60 is connected to the seal part 30, the formation position of the steam discharge part 70 in the sheet 20 can be brought close to the seal part 30. Since the steam-permeable seal part 60 is separated from the seal part 30, the steam discharge part 70 can be formed at a position away from the seal part 30 in the seat 20. The number of the vapor-permeable seal parts 60 provided in the inner part 23 is one or more. The steaming seal portion 60 is provided at an arbitrary location in the inner portion 23. In a preferred example, the vapor-permeable seal portion 60 is provided in a place where a strong stress concentration occurs when the pressure in the accommodation space 10C increases. In the first example, the steaming seal portion 60 is provided at a position facing the center in the longitudinal direction of the first seal portion 31 in the separation portion 10B. In the first example, when the separation unit 10B is separated from the pouch body 10A, the vapor sealing part 60 does not remain in the pouch body 10A, and the content C is removed from the storage space 10C when the content C is taken out from the storage space 10C. No leakage from 70. In the second example, the steaming seal portion 60 is provided in the pouch body 10A.

  FIG. 2 is an enlarged view of the steaming seal portion 60 and its surroundings. The outer shape of the vapor-permeable seal portion 60 can take various shapes. One example is a triangle, a shape similar to a triangle, a trapezoid, a shape similar to a trapezoid, and a convex shape. In the example shown in the figure, the outer shape of the fumigation seal portion 60 is an isosceles triangle. The sides constituting the isosceles triangle are the first side 60A and the second side 60B that are equal sides, and the third side 60C that is a bottom side. The seal width XA of the vapor permeable seal portion 60 is a distance between the first side 60A and the second side 60B in the first direction.

  When the pressure in the accommodation space 10C is increased by heating the vapor-permeable flat pouch 10, the vapor-permeable seal portion 60 is peeled off, and the vapor-sealed seal portion 60 is peeled off as the pressure increases. When the peeling of the steaming seal part 60 reaches the steam discharge part 70, the accommodation space 10 </ b> C communicates with the outside of the steaming flat pouch 10 through the steam discharge part 70. The communication area of the steam discharge part 70, which is the area of the steam discharge part 70 that directly communicates with the accommodation space 10C, becomes wider as the peeling of the steam seal part 60 proceeds. Assuming that the pressure in the storage space 10C is constant, the flow rate of water vapor discharged to the outside of the steam-through flat pouch 10 through the steam discharge part 70 increases as the communication area of the steam discharge part 70 increases. . The communication area is 0 in a state where the steaming seal part 60 is not peeled off and in a state where the peeling of the steaming seal part 60 does not reach the steam discharge part 70. When all of the portions around the steam discharge portion 70 in the steaming seal portion 60 are peeled off, the communication area becomes the largest.

  The vapor sealing part 60 includes a preceding peeling part 61 that includes a part that first peels off in the vapor sealing part 60, and a trailing peeling part 62 that includes a part that finally peels off in the vapor sealing part 60. In the example shown in the figure, the first peeling portion in the vapor-sealing seal portion 60 is a vertex 60D. The part peeled last in the steam-permeable seal part 60 is a part or all of the third side 60C. The seal width XA of the subsequent peeling part 62 with respect to the peeling progress direction of the steaming seal part 60 is wider than the seal width XA of the preceding peeling part 61 in the peeling progress direction of the steaming seal part 60.

  The preceding peeling part 61 includes, for example, the next part in the steaming seal part 60. In the first example, the preceding peeling portion 61 includes a portion from the vertex 60D of the vapor sealing portion 60 to the vapor discharge portion 70. When the range of the preceding peeling part 61 is a 1st example, the vapor | steam discharge | emission part 70 does not communicate with 10 C of accommodation spaces until peeling of the steaming seal | sticker part 60 arrives at the subsequent peeling part 62. FIG. Since the communication area is relatively narrow in a state immediately after the peeling of the vapor sealing part 60 reaches the steam discharge part 70, the force acting to peel the vapor sealing part 60 is high, and the preceding peeling part 61 is peeled off. Subsequently, the peeling at the trailing peeling portion 62 proceeds smoothly. In the second example, the preceding peeling portion 61 includes a portion from the vertex 60D to the end portion on the accommodation space 10C side in the steam discharge portion 70 (hereinafter, “inner end portion of the steam discharge portion 70”). When the range of the preceding peeling portion 61 is the second example, the inner end portion of the steam discharge portion 70 communicates directly with the accommodation space 10C in a state where the entire preceding peeling portion 61 is peeled. Since the communication area is relatively narrow, a state in which the pressure in the accommodation space 10C is relatively high is maintained. For this reason, the force which acts to peel off the vapor-permeable seal part 60 is high, and the peeling at the subsequent peeling part 62 proceeds smoothly following the peeling of the preceding peeling part 61.

  The sealing strength of the preceding peeling portion 61 (hereinafter referred to as “seal strength NA”) is determined by the ease of peeling of the preceding peeling portion 61 when the pressure in the accommodation space 10C is increased, and during the conveyance of the steaming flat pouch 10. It is preferable to be determined from the relationship with the difficulty of peeling of the preceding peeling portion 61 when a force is applied to the peeling portion 61. A preferable example regarding the maximum value of the seal strength NA is 45 N / 15 mm. A more preferable example regarding the maximum value of the seal strength NA is 40 N / 15 mm. A preferable example regarding the minimum value of the seal strength NA is 30 N / 15 mm. A more preferable example regarding the minimum value of the seal strength NA is 35 N / 15 mm. An example of a preferable range regarding the seal strength NA is 30 N / 15 mm to 45 N / 15 mm. An example of a more preferable range regarding the seal strength NA is 35 N / 15 mm to 40 N / 15 mm. An example of a preferable seal strength NA is 37.5 N / 15 mm. When the seal strength NA is included in the range of 45 N / 15 mm or less, the preceding peeling portion 61 is easily peeled when the pressure in the accommodation space 10C is increased. When the seal strength NA is included in the range of 30 N / 15 mm or more, the preceding peeling portion 61 is difficult to peel off when a force is applied to the preceding peeling portion 61 during the conveyance of the steam-through flat pouch 10.

  The sealing strength of the trailing peeling portion 62 (hereinafter referred to as “seal strength NB”) is determined by the ease of peeling of the trailing peeling portion 62 when the pressure in the storage space 10C is increased, and during the transportation of the vapor-permeable flat pouch 10 In addition, it is preferable to be determined from the relationship with the difficulty of peeling of the trailing peeling portion 62 when a force is applied to the trailing peeling portion 62. A preferred example of the maximum value of the seal strength NB is 31.5 N / 15 mm. A more preferable example regarding the maximum value of the seal strength NB is 28 N / 15 mm. A preferable example regarding the minimum value of the seal strength NB is 7.5 N / 15 mm. A more preferable example regarding the minimum value of the seal strength NB is 8.75 N / 15 mm. An example of a preferable range for the seal strength NB is 7.5 N / 15 mm to 31.5 N / 15 mm. An example of a more preferable range regarding the seal strength NB is 8.75 N / 15 mm to 28 N / 15 mm. An example of a preferable seal strength NB is 18.4 N / 15 mm. When the seal strength NB is included in the range of 31.5 N / 15 mm or less, the trailing peeling portion 62 is easily peeled when the pressure in the accommodation space 10C is increased. When the seal strength NB is included in the range of 7.5 N / 15 mm or more, the trailing peeling portion 62 is difficult to peel off when a force is applied to the trailing peeling portion 62 during the conveyance of the steaming flat pouch 10.

  The ratio of the seal strength NB to the seal strength NA (hereinafter referred to as “seal strength ratio RX”) is determined by the ease of peeling of the trailing peeling portion 62 when the pressure in the housing space 10C increases, It is preferable to determine from the relationship with the difficulty of peeling of the trailing peeling portion 62 when a force is applied to the trailing peeling portion 62 during conveyance. The formula for obtaining the seal strength ratio RX is “RX = (NB / NA) × 100”. A preferred example of the maximum value of the seal strength ratio RX is 75%. A more preferable example regarding the maximum value of the seal strength ratio RX is 70%. A preferred example for the minimum value of the seal strength ratio RX is 25%. An example of a preferable range for the seal strength ratio RX is 25% to 75%. An example of a more preferable range for the seal strength ratio RX is 25% to 70%. An example of a preferred seal strength ratio RX is 47.5%. When the seal strength ratio RX is included in the range of 75% or less, the trailing peeling portion 62 is easily peeled when the pressure in the accommodation space 10C is increased. When the seal strength ratio RX is included in the range of 25% or more, the trailing peeling portion 62 is difficult to peel off when a force is applied to the trailing peeling portion 62 during the conveyance of the steam-through flat pouch 10.

  The steam discharge part 70 can take various configurations. According to the first example, the steam discharge unit 70 is a cut or a hole penetrating the first sheet 21. According to the second example, the steam discharge unit 70 is a cut or a hole that does not penetrate the first sheet 21. The depth of the cut in the second example or the depth of the hole is such a depth that the portion corresponding to the steam discharge portion 70 of the first sheet 21 is broken when the vapor-permeable seal portion 60 is peeled off. It is preferable. The steam discharge part 70 can take various outer shapes. According to the first example, the outer shape of the steam discharge unit 70 is a rectangle extending in the first direction or the second direction. According to the second example, the outer shape of the steam discharge unit 70 is an equilateral triangle, an isosceles triangle, a square, or a polygon that is a pentagon or more. In a state where the peeling of the vapor-permeable seal part 60 does not reach the hole or notch of the steam discharge part 70, the hole or notch does not communicate the accommodation space 10C with the outside. In a state where the peeling of the vapor sealing portion 60 reaches the hole or the cut, the hole or the cut communicates the housing space 10C with the outside, and the portion of the hole or the cut that communicates the housing space 10C with the outside as the peeling progresses. The communication area is expanded.

  In the first example or the second example, when the outer shape of the steam discharge part 70 is formed so as to extend in the peeling progress direction of the vapor-permeable seal part 60 (hereinafter referred to as “peeling progress direction”), it is matched with the progress of peeling. The communication area will gradually increase. For this reason, it is suppressed that the flow volume of the water vapor | steam discharged | emitted from 10 C of exteriors outside increases rapidly, and peeling of the vapor-permeable seal part 60 reaches | attains the vertex 60D which is an edge part of the subsequent peeling part 62 easily.

  The ratio of the dimension HB of the steam discharge part 70 in the peeling progress direction to the dimension HA of the steam-permeable seal part 60 in the peeling progress direction (hereinafter referred to as “discharge part ratio RA”) is the ease of water vapor discharge and the steam discharge part 70. It is preferable to be determined from the relationship with the difficulty of entering foreign matter into the body. A formula for obtaining the discharge portion ratio RA is “RA = (HB / HA) × 100”. The dimension HA is, for example, the height of the vapor sealing part 60 when the outer shape of the vapor sealing part 60 is a triangle. The dimension HB is, for example, the length of the long side of the steam discharge unit 70 when the outer shape of the steam discharge unit 70 is a rectangle. A preferable example regarding the maximum value of the discharge portion ratio RA is 62.5%. A more preferable example regarding the maximum value of the discharge portion ratio RA is 25%. When the discharge portion ratio RA is 62.5% or less, it is difficult for foreign matter to enter the steam discharge portion 70. When the discharge portion ratio RA is 25% or less, foreign matter is less likely to enter the steam discharge portion 70. A preferable example regarding the minimum value of the discharge portion ratio RA is 12.5%. A more preferable example regarding the minimum value of the discharge portion ratio RA is 25%. When the discharge portion ratio RA is 12.5% or more, the water vapor is appropriately discharged from the vapor discharge portion 70 when the steaming seal portion 60 is peeled off. When the discharge portion ratio RA is 25% or more, the water vapor is further appropriately discharged from the vapor discharge portion 70 when the steaming seal portion 60 is peeled off.

  FIG. 3 shows the steaming type flat pouch 10 before the opening 40 is closed (hereinafter referred to as “the steaming type flat pouch 10 before closing”). The contents C (see FIG. 1) are put into the accommodation space 10C from the opening 40 of the steam-flowing flat pouch 10 before closing. The second seal portion 32 is formed by applying heat sealing to the planned seal portion 80 where the formation of the second seal portion 32 is scheduled after the contents C are charged, and the second seal portion 32 after the closing shown in FIG. A steam-through flat pouch 10 is obtained.

With reference to FIG. 1, an example of how to use the steaming flat pouch 10 will be described.
The closed steam-through flat pouch 10 is placed in a heating means (not shown) such as a microwave oven so that the second sheet 22 is below the first sheet 21 and heated by the heating means. After the heating is finished, each sheet 21, 22 is torn from the tip of the notch 52, and a force is applied to each sheet 21, 22 so that the tearing of each sheet 21, 22 proceeds along the tear line 51. By separating the separating portion 10B from the pouch body 10A, the contents C are taken out from the storage space 10C to the outside of the steam-through flat pouch 10.

With reference to FIGS. 4-6, the effect | action of the steaming type | mold flat pouch 10 is demonstrated.
When the closed steam-permeable flat pouch 10 is heated by the heating means, in one example, the second sheet 22 is positioned below and the first sheet 21 formed with the steam discharge portion 70 is positioned above. Set. In this state, when the closed steaming-type flat pouch 10 is heated, the pressure in the storage space 10C is increased by the water vapor generated from the contents C, and the force acting to peel off the steaming seal portion 60 is transmitted. The steam seal part 60 is applied. When the pressure in the storage space 10C rises to a certain level, peeling of the steaming seal part 60 from the preceding peeling part 61 starts, and peeling of the steaming seal part 60 proceeds toward the trailing peeling part 62. As shown in FIG. 4, when the peeling of the vapor seal part 60 reaches the steam discharge part 70, the steam discharge part 70 allows the storage space 10 </ b> C to communicate with the outside, so that the water vapor in the storage space 10 </ b> C is transferred to the steam discharge part. It is discharged to the outside through 70. For this reason, the rise in the pressure of the accommodation space 10C is suppressed, and the force acting to peel off the vapor-permeable seal portion 60 is reduced. However, since the sealing strength NB of the trailing peeling portion 62 is lower than the sealing strength NA of the preceding peeling portion 61, it is difficult to cause a situation where the peeling of the vapor-sealing seal portion 60 stops before the end of the trailing peeling portion 62. . As shown in FIG. 5, when the peeling of the vapor sealing part 60 reaches the end of the subsequent peeling part 62, the vapor sealing part 60 of the first sheet 21 causes the peeling as shown in FIG. 6. The joined portion moves upward so as to leave the second sheet 22 and the contents C. In the steaming type flat pouch 10, the steaming seal part 60 is formed in the inner part 23, and the steam discharge part 70 is formed in the steaming seal part 60, so the first sheet 21 moves upward. As a result, the steam discharge section 70 also moves upward so as to be separated from the second sheet 22 and the contents C. For this reason, the content C is hard to leak at the time of discharge | emission of water vapor | steam.

(Example)
This inventor performed the test which confirms the relationship between the structure of the steaming seal | sticker part 60, and steaming performance using the sample of an Example and a comparative example. FIG. 7 shows the test conditions of the comparative example and the example regarding the test. FIG. 8 shows the results of the test. In the following description, for convenience of explanation, the same reference numerals are given to portions common to the sample of the example in the sample of the comparative example. The sample of the example is a steaming type flat pouch 10 according to the embodiment. The sample of the comparative example is a steaming type flat pouch 10 having a configuration different from that of the steaming type flat pouch 10 of the example. The steaming type flat pouch 10 of each comparative example is different from the steaming type flat pouch 10 of the example in that the sealing strength NB of the trailing peeling portion 62 is equal to or higher than the sealing strength NA of the preceding peeling portion 61. In, the same structure as the steaming type flat pouch 10 of an Example is provided.

  The specifications regarding the sample of each example and each comparative example are as follows. The material constituting the outermost layer of each of the sheets 21 and 22 is polyethylene terephthalate. The thickness of the outermost layer is 12 μm. The material constituting the intermediate layer of each sheet 21 and 22 is nylon. The thickness of the intermediate layer is 15 μm. The material constituting the innermost layer of each sheet 21, 22 is unstretched propylene. The thickness of the innermost layer is 60 μm. The dimension in the first direction of the steaming type flat pouch 10 is 130 mm. The dimension in the second direction of the steam-through flat pouch 10 is 135 mm. The number of vapor sealing parts 60 provided in the inner part 23 is one. The position where the vapor-permeable seal part 60 is provided is a position facing the center in the longitudinal direction of the first seal part 31 in the separation part 10B. The outer shape of the vapor-permeable seal portion 60 is an isosceles triangle in which the seal width XA increases from the inner portion 23 toward the first seal portion 31. The outer shape of the steam discharge part 70 is a rectangle extending in the second direction. The short side dimension of the steam discharge unit 70 is 1 mm, and the long side dimension is 3 mm.

  The seal strength of the preceding peeling portion 61 of the samples of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 is 30 N / 15 mm. The sealing strength of the trailing peeling portion 62 of the sample of Example 1 is 10 N / 15 mm. The seal strength of the trailing peeling portion 62 of the sample of Example 2 is 20 N / 15 mm. The sealing strength of the trailing peeling portion 62 of the sample of Comparative Example 1 is 30 N / 15 mm. The sealing strength of the trailing peeling portion 62 of the sample of Comparative Example 2 is 40 N / 15 mm.

  In order to evaluate the steaming performance, it was visually confirmed whether or not the entire steaming seal 60 was peeled off when the steaming flat pouch 10 after being closed was heated by a heating means. The state where the entire vapor-permeable seal portion 60 is peeled is a state where the portions constituting the inner portion 23 of the first sheet 21 and the second sheet 22 are not joined. It was evaluated that the sealing steaming performance was good when the entire steaming seal portion 60 was peeled off, and the steaming performance was evaluated as not good when at least a part of the steaming seal portion 60 was not peeled off. . The number of trials is 5 times. The contents C are beef bowl. Beef bowl includes beef, vegetables, and soup stock. The weight of the contents C is 80 g. The output of the microwave oven is 600W. The heating time of the microwave oven is 1 minute 20 seconds.

  “◯” in the item of the steaming performance of FIG. 8 indicates a case where the entire steaming seal portion 60 is peeled off, and “X” indicates a case where at least a part of the steaming seal portion 60 is not peeled off. . According to the steaming type flat pouch 10 of the example, it was confirmed that when the steaming type flat pouch 10 after being closed was heated by the heating means, the whole steaming seal portion 60 was easily peeled off. Further, it was confirmed that the content C did not leak from the steam discharge portion 70 when the entire vapor seal portion 60 was peeled off. The state in which the contents C are not leaking from the steam discharge unit 70 is a state in which the contents C are not attached to the surface of the first sheet 21 and the surroundings of the steam-permeable flat pouch 10.

(Modification)
The description regarding the said embodiment is an illustration of the form which the steaming type | mold flat pouch regarding this invention can take, and it is not intending restrict | limiting the form. The steam-through flat pouch according to the present invention can take, for example, a combination of the following modified example of the above-described embodiment and at least two modified examples not inconsistent with each other.

  FIG. 9 is an example of a modification of the vapor transmission seal portion 60. The steaming seal portion 60 includes an unsealed portion 71 provided so as to surround the steam discharge portion 70. The unsealed portion 71 is a portion where the first sheet 21 and the second sheet 22 inside the outline of the vapor-sealed seal portion 60 are not joined, and is provided straddling the preceding peeling portion 61 and the trailing peeling portion 62. . After the vapor discharge part 70 is formed on the first sheet 21, when the first sheet 21 and the second sheet 22 are joined so that the unsealed part 71 is formed and the steaming seal part 60 is formed, The thermal contraction around the steam discharge part 70 in the first sheet 21 is suppressed. For this reason, the vapor | steam exhaust part 70 is easy to be maintained to a defined dimension.

DESCRIPTION OF SYMBOLS 10: Steaming type flat pouch 10C: Accommodating space 20: Seat 23: Inner part 30: Sealing part 50: Guide part 60: Steaming sealing part 61: Leading peeling part 62: Subsequent peeling part 70: Steam discharge part C :Contents

Claims (6)

A seal portion that seals the stacked sheets so that an accommodation space for accommodating the contents is formed;
A steaming seal part for joining a part of the sheet in an inner part of the sheet that is an inner part of the seal part;
In order to prevent communication between the housing space and the outside in a state where the steaming seal portion is not peeled off, the steaming seal portion is provided so as to communicate the housing space and the outside in a state where the steaming seal portion is peeled off. And a steam discharge part formed on the
The vapor sealing part includes a preceding peeling part including a first peeling part in the vapor sealing part as the pressure in the housing space increases, and a subsequent peeling including a last peeling part in the vapor sealing part. Part
The subsequent peeling portion is a portion where the sheet is weakly bonded to the preceding peeling portion,
At least a part of the steam discharge part is provided in the trailing peeling part. The steaming-type flat pouch according to claim 1, wherein the steam discharge portion includes a cut or a hole penetrating one of the stacked sheets and extends in the advancing direction of the peeling. A guide portion constituting a guide for separating the seat and a part of the seal portion in order to open the accommodating space closed by the seal portion;
The steaming type flat pouch according to claim 1 or 2, wherein the steaming seal part is provided in a portion of the sheet that is separated by the guide part. The steaming seal part is a part joined by sealing the sheet,
The steaming-type flat pouch according to any one of claims 1 to 3, wherein a ratio of the sealing strength of the subsequent peeling portion to the sealing strength of the preceding peeling portion is 25% or more. The steaming seal part is a part joined by sealing the sheet,
The steaming-type flat pouch according to any one of claims 1 to 4, wherein a ratio of the sealing strength of the subsequent peeling portion to the sealing strength of the preceding peeling portion is 75% or less. The steaming type flat pouch according to any one of claims 1 to 5, further comprising the contents housed in the housing space.