US20200180843A1 - Steam-releasing flat pouch - Google Patents

Steam-releasing flat pouch Download PDF

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Publication number
US20200180843A1
US20200180843A1 US16/789,248 US202016789248A US2020180843A1 US 20200180843 A1 US20200180843 A1 US 20200180843A1 US 202016789248 A US202016789248 A US 202016789248A US 2020180843 A1 US2020180843 A1 US 2020180843A1
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US
United States
Prior art keywords
steam
releasing
seal part
peeling
seal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US16/789,248
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English (en)
Inventor
Takahiro SHIMONO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toppan Inc
Original Assignee
Toppan Printing Co Ltd
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Filing date
Publication date
Application filed by Toppan Printing Co Ltd filed Critical Toppan Printing Co Ltd
Assigned to TOPPAN PRINTING CO., LTD. reassignment TOPPAN PRINTING CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SHIMONO, Takahiro
Publication of US20200180843A1 publication Critical patent/US20200180843A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B65D81/3438—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated by steaming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B65D81/3446—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated by microwaves
    • B65D81/3461—Flexible containers, e.g. bags, pouches, envelopes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/22—Details
    • B65D77/225—Pressure relief-valves incorporated in a container wall, e.g. valves comprising at least one elastic element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2205/00—Venting means
    • B65D2205/02—Venting holes

Definitions

  • the present invention relates to a steam-releasing flat pouch.
  • the steam-releasing flat pouch ( 100 ) of PTL 1 comprises a laminate ( 150 ) that forms an storage space ( 110 ) in which the contents are stored, and a heat-welded part ( 120 ) where the laminate ( 150 ) is joined so that the storage space ( 110 ) is closed.
  • the heat-welded part ( 120 ) includes an outer peripheral part ( 121 ) corresponding to the outer shape of the steam-releasing flat pouch ( 100 ), and a protruded part ( 130 ) formed so as to protrude from the outer peripheral part ( 121 ) toward the storage space ( 110 ).
  • a notch ( 140 ) is formed which communicates the outside of the steam-releasing flat pouch ( 100 ) in a state where the storage space ( 110 ) is closed by the heat-welded part ( 120 ).
  • the pressure in the storage space ( 110 ) is increased by the water vapor generated from the contents, and a force is exerted on the protruded part ( 130 ) that causes the protruded part ( 130 ), more specifically, the upper laminate ( 151 ) and the lower laminate ( 152 ) constituting the protruded part ( 130 ) to peel apart.
  • a part of the protruded part ( 130 ) peels apart as shown in FIG.
  • the upper laminate ( 151 ) and the lower laminate ( 152 ) are communicated with each other at the heat-welded part ( 120 ) which is a part of the portion of the laminate ( 150 ) where the notch ( 140 ) is formed.
  • the contents may leak from the notch ( 140 ) together with the water vapor.
  • a steam-releasing flat pouch comprises, a seal part configured to seal stacked sheets so as to form an storage space for storing contents, a steam-releasing seal part joining parts of the sheets respectively located in inner parts of the sheets so that the joined parts are not continuous with the seal part, each inner part being a part of the corresponding sheet inside the seal part, and a steam discharge part formed in the steam-releasing seal part and configured not to allow the storage space to communicate with the outside when the steam-releasing seal part is not peeled apart, and to allow the storage space to communicate with the outside when the steam-releasing seal part is peeled apart, wherein the steam-releasing seal part includes an anterior peeling part including a part that peels apart first in the steam-releasing seal part as a pressure in the storage space increases, and a posterior peeling part including a part that peels apart last in the steam-releasing seal part, and, a width of the posterior peeling part in a direction different from a direction in which peeling of the steam-releasing seal part proceeds is smaller than a width of the
  • the pouch When the steam-releasing flat pouch whose storage space is closed by the seal part is heated by the heating means, in an example, the pouch is set such that one of the stacked sheets is positioned below, and the other of the stacked sheets provided with the steam discharge part is positioned above.
  • the pressure in the storage space is increased by the steam generated from the contents, and a force for causing the steam-releasing seal part to peel apart is applied to the steam-releasing seal part.
  • peeling of the steam-releasing seal part starts from the anterior peeling part and the peeling of the steam-releasing seal part proceeds toward the posterior peeling part.
  • the steam discharge part allows the storage space to communicate with the outside. Therefore, the steam in the storage space is discharged to the outside through the steam discharge part. Thus, the increase in pressure in the storage space is suppressed, and the force for causing the steam-releasing seal part to peel apart is reduced.
  • the width of the posterior peeling part is smaller than the width of the anterior peeling part, a situation where the peeling of the steam-releasing seal part stops before the end of the posterior peeling part is unlikely to occur.
  • the peeling of the steam-releasing seal part reaches the end of the posterior peeling part, the portion of the sheet on top that has been joined by the steam-releasing seal part moves upward so as to be separated from the sheet below and the contents.
  • the steam-releasing seal part is formed in the inner part, and the steam discharge part is formed in the steam-releasing seal part.
  • the steam discharge part also moves upward so as to be separated from the sheet below and the contents.
  • the contents are unlikely to leak when the steam is discharged.
  • the posterior peeling part is formed so that the width thereof becomes narrower toward the direction in which the peeling proceeds.
  • the steam discharge part includes a cut or an aperture penetrating one of the stacked sheets, and is formed so as to extend in the direction in which the peeling proceeds.
  • the aperture or cut does not allow the storage space to communicate with the outside.
  • the aperture or cut allows the storage space to communicate with the outside, and the area (hereinafter referred to as communication area) of the aperture or cut that directly communicates between the storage space with the outside increases as the peeling progresses. Since the above-described steam-releasing flat pouch is formed so that the aperture or cut extends in the peeling progress direction, the communication area gradually increases as the peeling proceeds. Thus, the flow rate of the steam discharged outside from the storage space does not increase rapidly, and it helps the peeling of the steam-releasing seal part to reach the end of the posterior peeling part.
  • the pouch further comprises a guide part constituting a guide for separating the sheets and a part of the seal part in order to open the storage space closed by the seal part, and the steam-releasing seal part is provided in parts of the sheets that are separated by the guide part.
  • the steam discharge part does not remain in the portions of the sheets that store the contents, and the contents do not leak from the steam discharge part when contents are extracted from the storage space.
  • a dimension of the steam discharge part in the direction in which the peeling proceeds is 12.5% or larger of a dimension of the steam-releasing seal part in the direction in which the peeling proceeds.
  • a dimension of the steam discharge part in the direction in which the peeling proceeds is 62.5% or smaller of a dimension of the steam-releasing seal part in the direction in which the peeling proceeds.
  • the pouch further comprises the contents contained in the storage space.
  • the contents are unlikely to leak when steam is discharged.
  • FIG. 1 is a front view of a steam-releasing flat pouch according to an embodiment of the present invention.
  • FIG. 2 is an enlarged view of the steam-releasing seal part in FIG. 1 and its surroundings.
  • FIG. 3 is a front view of a steam-releasing flat pouch before an opening thereof is closed.
  • FIG. 4 is a front view of a steam-releasing flat pouch in a state where a part of the steam-releasing seal part in FIG. 1 is peeled.
  • FIG. 5 is a front view of a steam-releasing flat pouch in a state where the steam-releasing seal part in FIG. 4 is completely peeled.
  • FIG. 6 is a cross-sectional view taken along the line D 6 -D 6 of FIG. 5 .
  • FIG. 7 is a table showing test conditions of Comparative Examples and Examples regarding tests.
  • FIG. 8 is a table showing test results of Comparative Examples and Examples.
  • FIG. 9 is an enlarged view of the steam-releasing seal part and its surroundings according to a modification.
  • FIG. 10 is an enlarged view of the steam-releasing seal part and its surroundings according to a modification.
  • FIG. 11 is a front view of a conventional steam-releasing flat pouch.
  • FIG. 12 is a cross-sectional view taken along the line D 12 -D 12 of FIG. 11 .
  • FIG. 13 is a cross-sectional view showing a state where the protruded part of FIG. 12 is peeled.
  • FIG. 1 shows an example of a steam-releasing flat pouch 10 that can store contents C suitable for heating and can discharge the water vapor generated at the contents C.
  • the contents C generate water vapor when they are heated.
  • An example of the contents C is food.
  • An example is food cooked by heating.
  • the food may be ingredients of beef bowl, a hamburger steak, or stew.
  • the steam-releasing flat pouch 10 is configured to store the contents C for a long period maintaining their quality.
  • the steam-releasing flat pouch 10 includes a sheet 20 , a seal part 30 , an opening 40 (see FIG. 3 ), a guide part 50 , a steam-releasing seal part 60 , and a steam discharging part 70 .
  • the dots in FIG. 1 and other drawings represent the seal part 30 and the steam-releasing seal part 60 .
  • the sheet 20 include a first sheet 21 and a second sheet 22 .
  • the first sheet 21 and the second sheet 22 are facing each other so as to form a storage space 10 C between the sheets 21 and 22 for storing the contents C.
  • the configuration of the sheet 20 can be optionally selected.
  • the sheets 21 and 22 are two sheets formed individually.
  • the facing sheets 21 and 22 are formed by folding a single sheet.
  • the sheet 20 (the sheets 21 and 22 ) has a layered structure in which a plurality of layers are laminated.
  • the layered structure of the sheet 20 (the sheets 21 and 22 ) can be optionally selected.
  • the sheets 21 and 22 have the same layered structure.
  • the first and second sheets 21 and 22 have different layered structures.
  • FIG. 1 shows a steam-releasing flat pouch 10 constituted by a sheet 20 having the layer structure of the first example.
  • Each of the sheets 21 and 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 mainly excels in gloss, printing suitability, and retort resistance. Retort resistance means resistance to retort processing.
  • An example of the material forming the outermost layer is a transparent material.
  • An example of a transparent material is polyethylene terephthalate.
  • the intermediate layer mainly excels in retort resistance, moisture resistance, and gas barrier properties.
  • the intermediate layer includes a printed layer, a first adhesive layer, an oriented nylon layer, and a second adhesive layer. The printed layer is placed on the inner side of the outermost layer.
  • the printed layer is formed with patterns, texts such as item description, and the like printed on the outer surface thereof.
  • the first adhesive layer is placed on the inner side of the printed layer.
  • the oriented nylon layer is formed on the inner side of the first adhesive layer.
  • the second adhesive layer is formed on the inner side of the oriented nylon layer.
  • An example of the material forming each adhesive layer is a dry laminate adhesive.
  • the innermost layer excels in retort resistance, heat sealability, and impact resistance.
  • the innermost layer is placed on the inner side of the second adhesive layer.
  • An example of the material configuring the innermost layer is non-oriented polypropylene.
  • the seal part 30 joins the sheets 21 and 22 so that the sheets 21 and 22 are not separated.
  • 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 the method for forming the seal part 30 is heat sealing.
  • the outer shape of the steam-releasing flat pouch 10 in front view can be optionally selected. In the example shown in FIG. 1 , the outer shape of the steam-releasing flat pouch 10 is a rectangle.
  • the sheet 20 can be divided into a portion surrounded by the seal part 30 (hereinafter referred to as inner part 23 ) and the seal part 30 .
  • the storage space 10 C is a space surrounded by the inner part 23 of the first sheet 21 and the inner part 23 of the second sheet 22 , and is closed by the seal part 30 so as not to communicate with the outside of the steam-releasing flat pouch 10 .
  • the seal part 30 joins the first sheet 21 and the second sheet 22 so that the storage space 10 C is closed.
  • the seal part 30 is divided into first to fourth seal parts 31 to 34 .
  • the first seal part 31 is formed along the first side 20 A of the sheet 20 .
  • the second seal part 32 is formed along the second side 20 B of the sheet 20 .
  • the third seal part 33 is formed along the third side 20 C of the sheet 20 .
  • the fourth seal part 34 is formed along the fourth side 20 D of the sheet 20 .
  • the first seal part 31 , the third seal part 33 , and the fourth seal part 34 are formed ahead of the second seal part 32 in order to store the contents in the storage space 10 C.
  • an opening 40 for putting the contents into the storage space 10 C (see FIG. 3 ) is formed in the steam-releasing flat pouch 10 .
  • the second seal part 32 is formed after the contents are put into the storage space 10 C, and then the opening 40 is closed by the second seal part 32 .
  • the direction along the first side 20 A and the second side 20 B in the front view of the steam-releasing flat pouch 10 is referred to as a first direction
  • the direction along the third side 20 C and the fourth side 20 D is referred to as a second direction.
  • An inner edge 31 A which is an edge of the first seal part 31 on the inner part 23 side, an inner edge 32 A which is an edge of the second seal part 32 on the inner part 23 side, an inner edge 33 A which is an edge of the third seal part 33 on the inner part 23 side, and an inner edge 34 A which is an edge of the fourth seal part 34 on the inner part 23 side define the outer shape of the inner part 23 .
  • An outer edge 31 B which is the edge of the first seal part 31 opposite to the inner edge 31 A, an outer edge 32 B which is the edge of the second seal part 32 opposite to the inner edge 32 A, an outer edge 33 B which is the edge of the third seal part 33 opposite to the inner edge 33 A, and an outer edge 34 B which is the edge of the fourth seal part 34 opposite to the inner edge 34 A define the outer shape of the steam-releasing flat pouch 10 .
  • the width of each of the seal parts 31 to 34 can be optionally selected.
  • the width of each seal part 31 to 34 is the distance between the inner edges 31 A to 34 A and the outer edges 31 B to 34 B along a normal line of the center line in each seal part 31 to 34 .
  • the center line of each seal part 31 to 34 is an imaginary line segment passing between the inner edges 31 A to 34 A and the outer edges 31 B to 34 B.
  • the dimension in the first direction and the dimension in the second direction of the steam-releasing flat pouch 10 are determined, for example, from the relationship between the amount of contents C to be stored and the ease of carrying the steam-releasing flat pouch 10 .
  • the dimension in the first direction of the steam-releasing flat pouch 10 is the length of a line segment orthogonal to the second direction between the outer edge 33 B of the third seal part 33 and the outer edge 34 B of the fourth seal part 34 .
  • the dimension of the steam-releasing flat pouch 10 in the first direction differ for each portion, for example, the maximum dimension or the average dimension of the plurality of portions represents the dimension of the steam-releasing flat pouch 10 in the first direction.
  • the dimension of the steam-releasing flat pouch 10 in the first direction is 130 mm.
  • the dimension in the second direction of the steam-releasing flat pouch 10 is the length of a line segment orthogonal to the first direction between the outer edge 31 B of the first seal part 31 and the outer edge 32 B of the second seal part 32 .
  • the maximum dimension or the average dimension of the plurality of portions represents the dimension of the steam-releasing flat pouch 10 in the second direction.
  • the dimension of the steam-releasing flat pouch 10 in the second direction is 135 mm.
  • the opening 40 (see FIG. 3 ) is formed between a lower part 21 A of the first sheet 21 and a lower part 22 A of the second sheet 22 so that the contents C can be filled into the storage space 10 C.
  • the opening 40 is closed by the second seal part 32 .
  • the steam-releasing flat pouch 10 of the opening 40 being closed (hereinafter referred to as closed steam-releasing flat pouch 10 ) includes a pouch body 10 A and a separable part 10 B.
  • the pouch body 10 A and the separable part 10 B are segmented by a perforated line 51 constituting a guide part 50 .
  • the pouch body 10 A is a part for storing the contents C.
  • the separable part 10 B is a part of each of the sheets 21 and 22 including the first seal part 31 , and it is a part that the user separates from the pouch body 10 A in order to extract the contents C from the storage space 10 C.
  • the guide part 50 is formed between the pouch body 10 A and the separable part 10 B so that each of the sheets 21 and 22 is easily cut when the separable part 10 B is separated from the pouch body 10 A.
  • the guide part 50 includes a perforated line 51 and a notch 52 .
  • the perforated line 51 is a group of perforations formed in the seal parts 33 and 34 and the inner part 23 of the sheets 21 and 22 , and is formed as a straight line.
  • the notch 52 is formed in at least one of the third seal part 33 or the fourth seal part 34 such that the tip of the notch 52 is located on an imaginary line obtained by extending the perforated line 51 .
  • FIG. 1 shows an example where the notch 52 is formed in both of the third seal part 33 and the fourth seal part 34 .
  • the steam-releasing flat pouch 10 is heated by heating means (heating device) in order to heat the contents C.
  • heating means heating device
  • An example of the heating means is a microwave oven. Steam is generated from the contents C as the steam-releasing flat pouch 10 is heated. Because the storage space 10 C of the closed steam-releasing flat pouch 10 is closed by the seal part 30 , the pressure in the storage space 10 C increases as steam is generated.
  • a steam-releasing seal part 60 is a part where the innermost layer of the first sheet 21 and the innermost layer of the second sheet 22 are joined, and it is configured such that, as the pressure in the storage space 10 C increases, peeling apart of the innermost layer of the first sheet 21 and the innermost layer of the second sheet 22 occur.
  • the phrase “the steam-releasing seal part 60 peels apart” means that the innermost layer of the first sheet 21 and the innermost layer of the second sheet 22 both constituting the steam-releasing seal part 60 peel apart from each other.
  • the steam-releasing seal part 60 is configured to be peeled apart when the pressure in the storage space 10 C rises to a predetermined pressure.
  • a steam discharge part 70 allows the storage space 10 C to communicate with the outside of the steam-releasing flat pouch 10 when the steam-releasing seal part 60 peels apart so as to discharge steam generated at the contents C to the outside of the steam-releasing flat pouch 10 .
  • the steam discharge part 70 is provided in the inside of the outer shape of the steam-releasing seal part 60 .
  • the steam-releasing seal part 60 is provided so as not to be continuous with the seal part 30 . Since the steam-releasing seal part 60 is separated from the seal part 30 , the steam discharge part 70 is formed at a distance from the seal part 30 in the sheet 20 . There may be one or more steam-releasing seal parts 60 provided in the inner part 23 .
  • the steam-releasing seal part 60 is provided at any suitable location in the inner part 23 . In a preferred example, the steam-releasing seal part 60 is provided at a place where high stress concentration occurs when the pressure in the storage space 10 C increases.
  • the steam-releasing seal part 60 is provided in the separable part 10 B at a position facing the center of the first seal part 31 in the longitudinal direction.
  • the steam-releasing seal part 60 does not remain in the pouch body 10 A, and thus the contents C would not leak from the steam discharge part 70 when the contents C are removed from the storage space 10 C.
  • the steam-releasing seal part 60 is provided in the pouch body 10 A.
  • FIG. 2 is an enlarged view of the steam-releasing seal part 60 and its surroundings.
  • the outer shape of the steam-releasing seal part 60 may take various shapes. Examples include a triangle, a shape similar to a triangle, a trapezoid, a shape similar to a trapezoid, and a convex shape.
  • the outer shape of the steam-releasing seal part 60 is an isosceles triangle.
  • the sides constituting the isosceles triangle are a first side 60 A and a second side 60 B, both having equal sides, and a third side 60 C which is the bottom side.
  • the seal width XA of the steam-releasing seal part 60 is the distance between the first side 60 A and the second side 60 B.
  • the flow rate of steam discharged to the outside of the steam-releasing 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 zero in a state where the steam-releasing seal part 60 does not peel apart, and in a state where the peeling of the steam-releasing seal part 60 has not reached the steam discharge part 70 .
  • the communication area becomes the largest.
  • the steam-releasing seal part 60 includes an anterior peeling part 61 including a part that peels apart first in the steam-releasing seal part 60 and a posterior peeling part 62 including a part that peels apart last in the steam-releasing seal part 60 .
  • the portion of the steam-releasing seal part 60 that peels apart first is a part or all of the third side 60 C.
  • the portion of the steam-releasing seal part 60 that peels apart last is the apex 60 D.
  • the seal width XA of the posterior peeling part 62 in a direction different from the direction in which the peeling of the steam-releasing seal part 60 proceeds is smaller than the seal width XA of the anterior peeling part 61 in a direction different from the direction in which the peeling of the steam-releasing seal part 60 proceeds.
  • An example of the “different direction” is a crossing direction, and a preferred example is the direction orthogonal to the other direction.
  • the anterior peeling part 61 includes the portion from the third side 60 C to the inner end of the steam discharge part 70 .
  • the anterior peeling part 61 includes the inner end of the steam discharge part 70 .
  • the range of the anterior peeling part 61 is the range defined in the second example, the inner end of the steam discharge part 70 is directly communicated with the storage space 10 C when the anterior peeling part 61 has entirely peeled apart, but because the communication area of the steam discharge part 70 is relatively small, a state where the pressure in the storage space 10 C is relatively high is maintained. Thus, the force acting to peel the steam-releasing seal part 60 is high, the peeling of the posterior peeling part 62 proceeds smoothly following the peeling of the anterior peeling part 61 .
  • the communication area gradually increases in accordance with the progress of the peeling.
  • the flow rate of the steam discharged outside from the storage space 10 C does not increase rapidly, and it helps the peeling of the steam-releasing seal part 60 to reach the apex 60 D which is an edge of the posterior peeling part 62 .
  • a preferable example regarding the maximum value of the discharge part ratio RA is 62.5%.
  • a further preferable example regarding the maximum value of the discharge part ratio RA is 25%.
  • the discharge part ratio RA is 62.5% or less, foreign substance is less likely to enter into the steam discharge part 70 .
  • the discharge part ratio RA is 25% or less, foreign substance is even less likely to enter into the steam discharge part 70 .
  • a preferable example regarding the minimum value of the discharge part ratio RA is 12.5%.
  • a further preferable example regarding the minimum value of the discharge part ratio RA is 25%.
  • the discharge part ratio RA is 12.5% or greater, the steam is appropriately discharged from the steam discharge part 70 when the steam-releasing seal part 60 peels apart.
  • the discharge part ratio RA is 25% or greater, the steam is further appropriately discharged from the steam discharge part 70 when the steam-releasing seal part 60 peels apart.
  • FIG. 3 shows the steam-releasing flat pouch 10 of before the opening 40 is closed (hereinafter referred to as unclosed steam-releasing flat pouch 10 ).
  • the contents C (see FIG. 1 ) is put into the storage space 10 C from the opening 40 of the unclosed steam-releasing flat pouch 10 .
  • heat sealing is applied to a sealing-planned part 80 where the second seal part 32 is planned to be formed, and thus the second seal part 32 is formed, and the closed steam-releasing flat pouch 10 shown in FIG. 1 is obtained.
  • FIG. 1 an example of method for using the steam-releasing flat pouch 10 is described.
  • the closed steam-releasing flat pouch 10 is placed in heating means (not shown) such as a microwave oven such that the second sheet 22 is below the first sheet 21 , and then it is heated by the heating means. After the heating is finished, the sheets 21 and 22 are torn from the outer end of the notch 52 , and a force is applied to the sheets 21 and 22 so that the tearing of the sheets 21 and 22 proceeds along the perforated line 51 .
  • heating means such as a microwave oven
  • the sheets 21 and 22 are torn from the outer end of the notch 52 , and a force is applied to the sheets 21 and 22 so that the tearing of the sheets 21 and 22 proceeds along the perforated line 51 .
  • the closed steam-releasing flat pouch 10 When the closed steam-releasing flat pouch 10 is heated by the heating means, in one example, it is set such that the second sheet 22 is positioned below and the first sheet 21 having the steam discharge part 70 is positioned above. In this state, when the closed steam-releasing flat pouch 10 is heated, the pressure in the storage space 10 C is increased by the steam generated from the contents C, and a force acting to cause the steam-releasing seal part 60 to peel apart is applied to the steam-releasing seal part 60 . Once the pressure in the storage space 10 C rises to a certain level, peeling of the steam-releasing seal part 60 starts from the anterior peeling part 61 and the peeling of the steam-releasing seal part 60 proceeds toward the posterior peeling part 62 . As shown in FIG.
  • the steam discharge part 70 allows the storage space 10 C to communicate with the outside, so that the steam in the storage space 10 C is discharged to the outside through the steam discharge part 70 .
  • the increase of pressure in the storage space 10 C is suppressed, and the force acting to cause the steam-releasing seal part 60 to peel apart is reduced.
  • the seal width XA of the posterior peeling part 62 is smaller than the seal width XA of the anterior peeling part 61 , a situation where the peeling of the steam-releasing seal part 60 stops before the end of the posterior peeling part 62 is unlikely to occur. As shown in FIG.
  • the inventor of the present invention performed tests to confirm the relationship between the configuration of the steam-releasing seal part 60 and the steam discharge part 70 , and the seal peeling performance and the steam releasing performance, using samples of Examples and Comparative Examples.
  • FIG. 7 shows the test conditions of Comparative Examples and Examples regarding the tests.
  • FIG. 8 shows the test results.
  • the samples of Examples are steam-releasing flat pouches 10 according to embodiments.
  • the samples of Comparative Examples are steam-releasing flat pouch 10 provided with structures different from the steam-releasing flat pouches 10 of the Examples.
  • the steam-releasing seal part 60 has an outer shape of a circle in the samples of Comparative Examples 1 and 5.
  • the circle has a radius of 5 mm.
  • the steam-releasing seal part 60 has an outer shape of square in the samples of Comparative Examples 2 and 6. Each side of the square has a length of 10 mm.
  • the outer shape of the steam-releasing seal part 60 of the samples of Comparative Examples 3 and 7 is a trapezoid configured such that the seal width XA becomes wider from the center of the inner part 23 toward the first seal part 31 , that is, in the peeling progress direction.
  • the length of the upper base of the trapezoid is 10 mm, the length of the lower base is 20 mm, and the height is 10 mm.
  • the outer shape of the steam-releasing seal part 60 of the samples of Comparative Examples 4 and 8 is a regular triangle configured such that the seal width XA becomes wider from the center of the inner part 23 toward the first seal part 31 , that is, in the peeling progress direction.
  • Each side of the regular triangle has a length of 10 mm.
  • the inventor visually confirmed whether the entire steam-releasing seal part 60 had peeled apart after heating the closed steam-releasing flat pouch 10 using the heating means.
  • the state where the entire steam-releasing seal part 60 has peeled apart is a state where the portions of the first and second sheets 21 and 22 constituting the inner part 23 are not joined. If the entire steam-releasing seal part 60 peels apart, the seal peeling performance is evaluated to be good, and if at least a part of the steam-releasing seal part 60 does not peel apart, the seal peeling performance is evaluated to be not good.
  • the inventor visually confirmed whether the contents C had leaked from the steam discharge part 70 when the closed steam-releasing flat pouch 10 was heated by the heating means to discharge steam from the steam discharge part 70 .
  • the state where the contents C do not leak from the steam discharge part 70 is a state where the contents C are not attached to the surface of the first sheet 21 and around the steam-releasing flat pouch 10 .
  • the state where the contents C has leaked from the steam discharge part 70 is a state where the contents C are attached to the surface of the first sheet 21 and/or around the steam-releasing flat pouch 10 .
  • the test was performed three times.
  • the contents C are ingredients of beef bowl.
  • the ingredients of beef bowl include beef, vegetables, and soup stock.
  • the contents C has a weight of 80 g.
  • the microwave oven has power of 600 W.
  • the heating time of the microwave oven is 1 minute and 20 seconds.
  • the description of the embodiments described above is only an exemplary form of the steam-releasing flat pouch according to the present invention, and it is not intended that forms thereof are limited.
  • the steam-releasing flat pouch according to the present invention could encompass, for example, modifications of the above embodiments and combinations of at least two modifications that are mutually compatible.
  • the structure of the steam-releasing seal part 60 can be arbitrarily changed.
  • FIG. 9 shows an example of a modification for the steam-releasing seal part 60 .
  • the steam-releasing seal part 60 includes an anterior peeling part 61 and a posterior peeling part 62 .
  • the outer shape of the anterior peeling part 61 may be a semicircle.
  • the outer shape of the posterior peeling part 62 is an isosceles triangle whose seal width XA decreases in the peeling progress direction.
  • the steam discharge part 70 can be provided at any suitable position inside the outer shape of the steam-releasing seal part 60 .
  • the steam discharge part 70 is provided so as to straddle the anterior peeling part 61 and the posterior peeling part 62 .
  • the steam discharge part 70 is provided only in the posterior peeling part 62 of the steam-releasing seal part 60 .
  • FIG. 10 shows an example of another modification of the steam-releasing seal part 60 .
  • the steam-releasing seal part 60 includes an unsealed part 71 provided so as to surround the steam discharge part 70 .
  • the unsealed part 71 is a part inside the outer shape of the steam-releasing seal part 60 where the first sheet 21 and the second sheet 22 are not joined.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Package Specialized In Special Use (AREA)
US16/789,248 2017-08-16 2020-02-12 Steam-releasing flat pouch Abandoned US20200180843A1 (en)

Applications Claiming Priority (3)

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JP2017-157175 2017-08-16
JP2017157175A JP6988255B2 (ja) 2017-08-16 2017-08-16 通蒸型平パウチ
PCT/JP2018/029745 WO2019035399A1 (ja) 2017-08-16 2018-08-08 通蒸型平パウチ

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TWI829644B (zh) 2024-01-21
WO2019035399A1 (ja) 2019-02-21
CN111032532B (zh) 2022-07-19
TW201910228A (zh) 2019-03-16
JP2019034761A (ja) 2019-03-07
JP6988255B2 (ja) 2022-01-05

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