JP2018033732A - container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container capable of cooking a content by electromagnetic induction heating for heating the content with an electromagnetic cooker using induction heating, the container being capable of suppressing fusion of a film constituting the container and having high heating performances.SOLUTION: A container 1C includes a bottom surface 4 that is zoned into a grounding plane 43 functions as a grounding plane, and a non-grounding plane 44 other than the grounding plane 43. The grounding plane 43 is constituted of a film that can be heated by electromagnetic induction, where the film is a laminate formed by laminating at least a base material layer, a metallic foil layer, and a sealant layer in this order from the outside. The thickness-directional distance from an external surface of the film to the metallic foil layer is 6.5-5000 μm.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a container capable of electromagnetic induction heating cooking.

  A pouch (container) capable of electromagnetic induction heating cooking that heats contents by an electromagnetic cooker using induction heating is known (for example, see Patent Document 1). The pouch described in Patent Document 1 is said to be capable of cooking and heating with an electromagnetic cooker by providing a heating element such as an aluminum foil on the inner surface of the pouch.

JP 2007-296040 A

  In a container capable of electromagnetic induction heating cooking that heats the contents with an electromagnetic cooker that uses induction heating, it is desired to further improve the heating performance.

  As a result of extensive studies by the inventors, it has been found that depending on the configuration of the film constituting the bottom surface of the container, the film melts when subjected to electromagnetic induction cooking.

  The present invention has been made in consideration of such points, and in a container capable of electromagnetic induction heating cooking in which contents are heated by an electromagnetic cooker using induction heating, the film constituting the container is melted. An object of the present invention is to provide a container having high heating performance.

  As a result of intensive investigations to solve the above problems, the present inventors have determined the distance in the thickness direction from the outer surface of the film constituting the grounding surface portion of the bottom surface of the container to the metal foil layer. The inventors have found that this can be solved, and have completed the present invention.

  (1) A container having a bottom surface partitioned into a ground surface portion functioning as a ground surface and a non-ground surface portion other than the ground surface portion, wherein the ground surface portion is formed of a film capable of electromagnetic induction heating, and the film Is a laminate in which a base material layer, a metal foil layer, and a sealant layer are laminated in this order at least from the outside, and the distance in the thickness direction from the outer surface of the film to the metal foil layer is 6.5 μm. A container having a size of 5000 μm or less.

  (2) The container according to (1), wherein the distance in the thickness direction is 6.5 μm or more and 250 μm or less.

  (3) The container according to (1) or (2), wherein the base material layer includes a plastic film.

  According to the present invention, in a container capable of electromagnetic induction heating cooking that heats the contents with an electromagnetic cooker using induction heating, a container that can suppress melting of the film constituting the container and has high heating performance is provided. Can be provided.

It is a figure showing pouch 1A as an embodiment of the container of the present invention, and is a figure showing pouch 1A in the state where bottom 4 was folded in two and upper opening part 51 was opened. (A) is a front view, (B) is a rear view. It is an AA line end view shown in FIG. It is a figure which shows the state which extended the bottom face 4 to the front-back direction D3 about the pouch 1A shown in FIG. 1, (A) is a front view, (B) is a right view, (C) is a bottom view. It is a figure which shows the film 6 which forms the pouch 1A shown in FIG. 1, (A) is a perspective view, (B) is a right view. (A) is a front view of the film 6 shown in FIG. 4, (B) is a rear view of the film 6 shown in FIG. 4, (C) is a sectional view taken along the line CC in FIG. FIG. 4D is a cross-sectional view taken along the line DD shown in FIG. 2 is a cross-sectional view of a film 6. FIG. It is a perspective view which shows the pouch 1B as embodiment of the container of this invention, and is a figure which shows the pouch 1B in the state in which the bottom face 4 was formed in three dimensions and the upper opening part 51 was sealed. It is a front view of the pouch 1B shown in FIG. It is a bottom view of the pouch 1B shown in FIG. It is a perspective view showing pouch 1C as an embodiment of a container of the present invention, and is a figure showing pouch 1C in the state where bottom 4 was formed in three dimensions and upper opening part 51 was opened.

Embodiment
Hereinafter, a pouch 1 (1A, 1B, 1C) as an embodiment of a container of the present invention will be described with reference to the drawings. FIG. 1 is a view showing a pouch 1A as an embodiment of the container of the present invention, and is a view showing the pouch 1A in a state where the bottom surface 4 is folded in two and the upper opening 51 is opened. (A) is a front view, (B) is a rear view. 2 is an end view taken along line AA shown in FIG. 3A and 3B are diagrams illustrating a state in which the bottom surface 4 is extended in the front-rear direction D3 with respect to the pouch 1A illustrated in FIG. 1, FIG. 3A is a front view, FIG. 3B is a right side view, and FIG. 4A and 4B are diagrams showing the film 6 that forms the pouch 1A shown in FIG. 1, in which FIG. 4A is a perspective view and FIG. 4B is a right side view.

  5A is a front view of the film 6 shown in FIG. 4, FIG. 5B is a rear view of the film 6 shown in FIG. 4, and FIG. 5C is a CC line shown in FIG. 4B. Sectional drawing and (D) are DD sectional views taken on the line shown in FIG. 4 (B). FIG. 6 is a cross-sectional view of the film 6. FIG. 7 is a perspective view showing a pouch 1B as an embodiment of the container of the present invention, and is a view showing the pouch 1B in a state where the bottom surface 4 is three-dimensionally formed and the upper opening 51 is sealed. is there. FIG. 8 is a front view of the pouch 1B shown in FIG. FIG. 9 is a bottom view of the pouch 1B shown in FIG. FIG. 10 is a perspective view showing a pouch 1C as an embodiment of the container of the present invention, showing the pouch 1C in a state where the bottom surface 4 is formed in three dimensions and the upper opening 51 is opened. .

  In the description of the pouch 1 of the following embodiment, (1) the pouch 1 in which the bottom surface 4 is folded in two and the upper opening 51 is opened is referred to as “pouch 1A”, and (2) the bottom surface 4 is three-dimensional. And the pouch 1 in a state where the upper opening 51 is sealed by the upper seal portion 52 is referred to as “pouch 1B”, and (3) the bottom surface 4 is formed three-dimensionally and the upper opening The pouch 1 in a state where 51 is opened is referred to as “pouch 1C”. When a description common to “pouch 1A”, “pouch 1B”, and “pouch 1C” is given, it is appropriately referred to as “pouch 1”.

  For convenience, parts, regions, broken lines, and the like that have not yet been formed are also appropriately marked. For example, in the state shown in FIG. 1, the upper seal portion 52 is not formed in the upper opening 51, but the region where the upper seal portion 52 formed in the state shown in FIG. Reference numeral 52 is attached. In addition, although various joint portions are not formed on the film 6 shown in FIG. 5, the regions 12, 14, 16, 17, and 18 shown in FIG. About the broken line currently provided, the code | symbol L6 is attached | subjected to FIG. Further, in the pouch 1A shown in FIG. 2, the accommodating portion 5 is not formed in a space, but the portion where the accommodating portion 5 is planned is denoted by reference numeral 5 in FIG. 2.

  As shown in FIGS. 1-10, the pouch 1 of this embodiment is comprised with the film 6 of the sheet | seat 6 which can be heated by electromagnetic induction, The front surface 2, the back surface 3, the bottom surface 4, and the accommodating part 5 are comprised. A pouch 1 provided. As shown in FIG. 1 and the like, the vertical direction of the pouch 1 is referred to as “vertical direction D1”, the horizontal direction (horizontal direction) of the pouch is referred to as “lateral direction D2”, and the front-rear direction is referred to as “front-rear direction D3”.

(Pouch 1A)
(1) First, the “pouch 1A” in which the bottom surface 4 is folded in two and the upper opening 51 is opened will be described. As shown in FIGS. 4 and 5, the pouch 1 </ b> A according to the embodiment is formed by folding a single rectangular belt-shaped film 6 at a fold line at a predetermined location and joining at a joint at a predetermined location. Specifically, as shown in FIGS. 1 to 5, the rectangular strip-shaped film 6 is folded along the longitudinal direction at the first fold line L1, along the valley along the third fold line L3, and along the second fold line L2. Turn it back 3 times so that it folds in the mountain. By folding in this way, the film 6 is folded in a substantially W shape (inverted M shape). The portion of the film 6 between the first broken line L1 and the second broken line L2 becomes the bottom surface 4 (bottom sheet 40). A portion of the bottom surface 4 (bottom sheet 40) between the first broken line L1 and the third broken line L3 is a first bottom surface portion 41. A portion of the bottom surface 4 (bottom sheet 40) between the second broken line L2 and the third broken line L3 becomes a second bottom surface portion 42. The portion of the film 6 outside the first broken line L1 becomes the surface 2 (surface sheet 20). The portion of the film 6 outside the second broken line L2 becomes the back surface 3 (back surface sheet 30).

  That is, the film 6 has a rectangular topsheet 20 that forms the front surface 2, a rectangular backsheet 30 that forms the backside 3, a topsheet 20 and the backsheet 30, and a bottom surface 4. And a rectangular bottom sheet 40. The top sheet 20, the bottom sheet 40, and the back sheet 30 are continuously arranged.

  Further details will be described. The front surface 2 (surface sheet 20) and the bottom surface 4 (bottom sheet 40) are connected via the first broken line L1. The back surface 3 (back surface sheet 30) and the bottom surface 4 (bottom surface sheet 40) are continuously provided via the second broken line L2. The bottom surface 4 (bottom sheet 40) is partitioned into a first bottom surface portion 41 including a first broken line L1 and a second bottom surface portion 42 including a second broken line L2. The 1st bottom face part 41 and the 2nd bottom face part 42 are provided in a row via the 3rd broken line L3, are convex toward the accommodating part 5 in the 3rd broken line L3 (it protrudes upwards), 2 It is folded.

As shown in FIG. 2, the front surface 2 (surface sheet 20) has a first surface portion 21 that faces the back surface 3 (back surface sheet 30) and a first surface portion 41 that faces the bottom surface 4 (bottom sheet 40). It is divided into two surface portions 22. The first surface portion 21 and the second surface portion 22 are partitioned by a first boundary line L4.
The back surface 3 (back surface sheet 30) is partitioned into a first back surface portion 31 facing the front surface 2 (surface sheet 20) and a second back surface portion 32 facing the second bottom surface portion 42 of the bottom surface 4 (bottom surface sheet 40). Has been. The first back surface portion 31 and the second back surface portion 32 are partitioned by the second boundary line L5.
3 shows that the front surface 2 (front surface sheet 20) is bent at the first boundary line L4 and the back surface 3 (back surface sheet 30) is bent at the second boundary line L5, and the bottom surface 4 (bottom sheet 40) is folded in the front-rear direction D3. The extended state is shown.

  The front surface 2 (surface sheet 20) and the back surface 3 (back surface sheet 30) are disposed to face each other in the front-rear direction D3. The accommodating part 5 is a space surrounded by the front surface 2 (surface sheet 20), the bottom surface 4 (bottom sheet 40), and the back surface 3 (back surface sheet 30). The upper opening 51 is referred to as an “upper opening 51” for convenience in either an open state or a state sealed by the upper seal portion 52 as described later.

  The first surface portion 21 of the front surface 2 (surface sheet 20) and the first back surface portion 31 of the back surface 3 (back surface sheet 30) are the both side portions 11 of the first surface portion 21 and the both side portions 11 of the first back surface portion 31. Are joined by a pair of side joints 12 that join each other. Specifically, the left side portion 11 of the first front surface portion 21 and the left side portion 11 of the first back surface portion 31 are joined by the left side joint portion 12. Similarly, the right side portion 11 of the first surface portion 21 and the right side portion 11 of the first back surface portion 31 are joined by the right side joint portion 12. The side joint 12 extends along the up-down direction D1.

  The second surface portion 22 of the front surface 2 (surface sheet 20) and the first bottom surface portion 41 of the bottom surface 4 (bottom surface sheet 40) are first inward from the lower end 12B of the side joint portion 12 in the lateral direction D2. Joined by a pair of first bottom joints 14 extending to the broken line L1. More specifically, the second surface portion 22 of the surface 2 (surface sheet 20) and the first bottom surface portion 41 of the bottom surface 4 (bottom sheet 40) are directed obliquely downward to the right from the lower end 12B of the left side joint portion 12. The right first bottom portion extending to the first polygonal line L1 from the lower end 12B of the right side joint 12 to the first folding line L1 while being joined by the left first bottom joint 14 extending to the first polygonal line L1. Joined by the joint 14.

  The second back surface portion 32 of the back surface 3 (back surface sheet 30) and the second bottom surface portion 42 of the bottom surface 4 (bottom surface sheet 40) are second from the lower end 12B of the side joint portion 12 toward the inside in the lateral direction D2. It joins by a pair of 2nd bottom part junction part 16 extended to the broken line L2. More specifically, the second back surface portion 32 of the back surface 3 (back surface sheet 30) and the second bottom surface portion 42 of the bottom surface 4 (bottom sheet 40) are directed obliquely downward to the right from the lower end 12B of the left side joint portion 12. The second bottom portion on the right side that is joined by the left second bottom joint portion 16 that extends to the second broken line L2 and that extends diagonally downward to the left from the lower end 12B of the right side joint portion 12 to the second broken line L2. Joined by the joint 16.

  The detail of the 1st bottom part junction part 14 and the 2nd bottom part junction part 16 is demonstrated. Although both are provided in different locations, both have the same configuration, and thus the description for one is incorporated in the description for the other. The 1st bottom part junction part 14 and the 2nd bottom part junction part 16 are linear form of equal width (the width | variety of the extending direction is equal) in this embodiment. The lower ends 14B of the pair of first bottom joint portions 14 are separated from each other in the lateral direction D2. The lower ends 16B of the pair of second bottom joint portions 16 are separated from each other in the lateral direction D2. The 1st bottom part junction part 14 and the 2nd bottom part junction part 16 are not provided over the full width of the bottom face 4 (over the whole area of the horizontal direction D2). That is, in the bottom surface 4 (bottom sheet 40), there is a portion where the first bottom joint portion 14 and the second bottom joint portion 16 are not provided (a ground plane portion 43 described later) in the lateral direction D2.

  In the present embodiment, the second surface portion 22 of the surface 2 (surface sheet 20) and the first bottom surface portion 41 of the bottom surface 4 (bottom sheet 40) are the second surface portions positioned below the side joint portion 12. 22 and the first bottom side portion 41 are joined by a pair of first lower side joint portions 17 that join the both side portions of the first bottom surface portion 41 respectively. The lower side joint portion 17 extends along the up-down direction D1.

  The second back surface portion 32 of the back surface 3 (back surface sheet 30) and the second bottom surface portion 42 of the bottom surface 4 (bottom surface sheet 40) are connected to both sides of the second back surface portion 32 positioned below the side portion joint portion 12. The two bottom side portions 42 are joined by a pair of second lower side joining portions 18 that join the both side portions. The lower side joint 18 extends along the up-down direction D1.

  The side joint part 12, the first bottom part joint part 14, the second bottom part joint part 16, the first lower side part joint part 17, and the second lower side part joint part 18 are formed by heat sealing, for example.

[Layer structure of film 6]
As shown in FIG. 6, the electromagnetic induction heatable film 6 is a laminate in which a base material layer 61, a metal foil layer 62, and a sealant layer 63 are laminated in this order from at least the outside. Other layers may be provided in the laminate. When there is another outermost layer outside the base material layer, this outermost layer forms the outer surface of the film 6.

Specific examples of the material of the base material layer 61 include, for example, polyesters such as polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate, and polyamides such as polycarbonate, nylon 6, nylon 6,6, nylon 12, and nylon 6,66 copolymer. Examples thereof include a plastic film made of a thermoplastic resin such as polyolefin such as polyethylene and polypropylene, and paper. Polyester and polyamide are preferred. The base material layer 61 is preferably uniaxially or biaxially stretched. When the base material layer 61 is a thermoplastic resin, the thickness is 1 μm or more and 200 μm or less, more preferably 10 μm or more and 120 μm or less. When the base material layer 61 is paper, the basis weight is 5 g / m ² or more and 600 g / m ² or less. The base material layer may be a single layer or two or more layers.

  The metal foil layer 62 is a conductive layer and functions as a heating element by an electromagnetic cooker. Specific examples of the material of the metal foil layer 62 include aluminum, nickel, iron, stainless steel, copper, alloys made of these metals, and carbon. Note that nonmagnetic materials such as aluminum and copper are heated by Joule heat loss, while ferromagnetic materials such as iron and nickel are also heated by hysteresis loss. Aluminum that is inexpensive and excellent in workability without heating due to hysteresis loss is preferably used.

  The thickness of the metal foil layer 62 can be appropriately selected depending on the type of the material. In the case of aluminum, the thickness is 5 to 120 μm, more preferably 10 to 80 μm. If it is this range, the pouch for electromagnetic cookers can be heated by the Joule heat loss by the eddy current of a surface direction.

  Specific examples of the material for the sealant layer 63 include polyamides such as nylon 6, nylon 6,6, nylon 12, and nylon 6.66 copolymers, polyolefins such as polyethylene and polypropylene, and polyester ethers. The sealant layer is preferably unstretched. The thickness of the sealant layer 63 is 1 μm or more and 200 μm or less, more preferably 10 μm or more and 120 μm or less.

Specific examples of the laminate include the following. Note that “/” is used as a notation indicating a boundary between layers when listing layers. The layers are described from the outside to the inside. That is, the layer described on the rightmost side is a sealant layer.
In the pouch 1 for retort (curry, oden, etc.)
Polybutylene terephthalate (PBT) / Aluminum foil / Unstretched polypropylene (CPP)
Polyethylene terephthalate (PET) / stretched nylon (ONy) / aluminum foil / unstretched propylene (CPP)
Polyethylene terephthalate (PET) / aluminum foil / stretched nylon (ONy) / unstretched propylene (CPP) with added iron powder
Etc.,
In pouch 1 for noodles with soup (ramen etc.)
Paper / Aluminum foil / CPP
Etc.

  When the grounding surface portion 43 (described later) of the bottom surface 4 is placed in close contact with the placement surface (not shown) of the electromagnetic cooker, the thickness direction distance t61 is from the placement surface of the electromagnetic cooker to the metal foil layer. It can be regarded as a distance up to 62. When the base material layer 61 forms the outer surface of the form 6, the thickness direction distance t 61 matches the thickness of the base material layer 61. When another outermost layer is present outside the base material layer, the thickness direction distance t61 is a distance from the outer surface of the outermost layer to the metal foil layer 62.

  The lower limit (see FIG. 6) of the thickness direction distance t61 from the outer surface of the film 6 to the metal foil layer 62 is 6.5 μm, and preferably 9.0 μm. If the thickness direction distance t61 is too small, the film 6 is overheated and a part of the film 6 is easily melted. The upper limit of the thickness direction distance t61 is 5000 μm, preferably 250 μm. If the distance t61 in the thickness direction is too large, the heating efficiency for the contents of the container tends to be insufficient, and the contents are not easily heated.

  The film 6 made of a laminate in which the base material layer 61, the metal foil layer 62, and the sealant layer 63 are laminated is folded back into a predetermined shape in a state where the sealant layers 63 are in contact with each other, and the predetermined portion is heat sealed. Is done. Thereby, the side part joining part 12, the 1st bottom part joining part 14, the 2nd bottom part joining part 16, the 1st lower side part joining part 17, and the 2nd lower side part joining part 18 are formed.

(Pouch 1B)
(2) Next, the “pouch 1 </ b> B” in which the bottom surface 4 is three-dimensionally formed and the upper opening 51 is sealed by the upper seal portion 52 will be described.
As shown in FIG. 3, the bottom surface 4 (bottom sheet 40) is made flat. Thereafter, the front surface 2 (surface sheet 20) and the back surface 3 (back surface sheet 30) are separated in the front-rear direction D3. Further, the bottom surface 4 (bottom sheet 40) is bent so as to form a left sixth broken line L6 that connects the lower end 14B of the left first bottom joint portion 14 and the lower end 16B of the left second bottom joint portion 16. Similarly, the bottom surface 4 (bottom sheet 40) is folded so as to form a right sixth broken line L6 connecting the lower end 14B of the right first bottom joint portion 14 and the lower end 16B of the right second bottom joint portion 16. .

  The bottom surface 4 (bottom sheet 40) is partitioned into a ground surface portion 43 that functions as a ground surface and a non-ground surface portion 44 other than the ground surface portion 43. Specifically, the bottom surface 4 (bottom sheet 40) is formed with a ground surface portion 43 that does not include the first bottom joint portion 14 and the second bottom joint portion 16 at the center in the lateral direction D2, and the ground surface portion 43. The non-grounding surface portions 44 and 44 including the first bottom joint portion 14 and the second bottom joint portion 16 are formed on the outside (left side and right side respectively). As shown in FIG. 8, the grounding surface portion 43 is substantially flat, and the non-grounding surface portion 44 is bent at the sixth broken line L6 and extends obliquely upward in a front view.

  Since the grounding surface portion 43 is a part of the bottom surface 4, the grounding surface portion 43 is composed of a film 6 that can be heated by electromagnetic induction. The width W43 (see FIG. 9; the length in the horizontal direction D2) of the ground surface portion 43 is, for example, 90 mm or more and 300 mm or less. In the non-grounding surface portion 44, when the grounding surface portion 43 is placed on the placement surface (not shown) of the electromagnetic cooker, the first bottom joint portion 14 and the second bottom joint portion 16 are substantially on the placement surface. It will have a shape that does not abut.

  Note that “the shape in which the first bottom joint portion 14 and the second bottom joint portion 16 do not substantially contact the placement surface” for the non-grounding surface portion 44 means that the contents are not accommodated in the accommodating portion 5. And in the below-mentioned pouch 1C (refer FIG. 10) in which the bottom face 4 was formed in three dimensions, it means that the 1st bottom part junction part 14 and the 2nd bottom part junction part 16 do not contact | abut a mounting surface.

  Moreover, the shape of the front surface 2 and the back surface 3 corresponding to the accommodating part 5 is a substantially hexagonal shape in which a rectangle is arranged on the upper side and an isosceles trapezoid narrowed on the lower side is arranged on the lower side. The shape of the bottom surface 4 corresponding to the accommodating part 5 is a substantially hexagonal shape. Specifically, the ground contact surface portion 43 has a rectangular shape, and the non-ground contact surface portions 44 and 44 each have an isosceles triangle shape. From another viewpoint, the first bottom surface portion 41 has an isosceles trapezoidal shape that narrows forward, and the second bottom surface portion 42 has an isosceles trapezoidal shape that narrows backward.

  The area S43 of the ground contact surface portion 43 is preferably smaller than the area S44 (total) of the non-ground contact surface portion 44, and more preferably 50% or less of the area S44 (total) of the non-ground contact surface portion 44.

  In the pouch of this embodiment, the bottom surface 4 is composed of a non-grounding surface portion 44 having the first bottom joint portion 14 and the second bottom joint portion 16 and a grounding surface portion 43 having no bottom joint portion. The grounding surface portion 43 that does not have the bottom joint portion is used as the grounding surface.

[Container 5]
The accommodating part 5 is formed in a space. Since the upper opening 51 at the upper part of the housing part is greatly opened, the contents can be easily introduced into the housing part 5 through the upper opening 51. After the contents are accommodated in the accommodating portion 5, as shown in FIGS. 7 to 9, the upper seal portion 52 is formed in the upper opening 51, so that the bottom surface 4 is three-dimensionally formed, and the upper portion A “pouch 1 </ b> B” in which the opening 51 is sealed by the upper seal portion 52 is formed. In this state, the edge of the accommodating portion 5 is located between the upper seal portion 52, the side joint portion 12, the first bottom joint portion 14, the second bottom joint portion 16, and the lower ends 14B of the first bottom joint portion 14. It is comprised by the 1st broken line L1 and the 2nd broken line L2 between the lower ends 16B of the 2nd bottom part junction part 16. FIG.

(Pouch 1C)
(3) Next, the “pouch 1C” in which the bottom surface 4 is three-dimensionally formed and the upper opening 51 is released will be described. As shown in FIG. 10, in the pouch 1C of this embodiment, the upper opening 51 may be released. The state in which the upper opening 51 is released includes the state before the upper seal portion 52 is formed in the upper opening 51 and the content from the storage portion 5 after the upper seal portion 52 is formed in the upper opening 51. And the state which opened the upper seal part 52 when taking out and cooking.

  The pouch 1 of this embodiment is cooked as follows. The grounding surface portion 43 of the bottom surface 4 of the pouch 1 is placed on the placement surface of the electromagnetic cooker (not shown) without opening or opening the upper opening 51 of the pouch 1. At that time, the non-grounding surface portion 44 of the bottom surface 4 is unlikely to come into contact with the mounting surface of the electromagnetic cooking device. When a high frequency is passed through the magnetic force generating coil portion provided below the mounting surface of the electromagnetic cooker, an eddy current is generated in the pouch 1 on the mounting surface of the electromagnetic cooker (particularly in the ground surface portion 43). The pouch 1 (especially the ground surface portion 43) is heated by electric resistance. Finally, the contents accommodated in the accommodating part 5 of the pouch 1 are cooked. In this embodiment, since the grounding surface part 43 is flat, the grounding surface part 43 tends to abut on the entire surface of the electromagnetic cooking device. Therefore, the ground plane part 43 is efficiently heated.

[Effect of the embodiment]
According to the pouch 1 of this embodiment, the following effects are produced, for example. In the pouch 1 of the present embodiment, the grounding surface portion 43 is composed of a film 6 that can be heated by electromagnetic induction, and the film 6 includes, from at least the outside, a base material layer 61, a metal foil layer 62, and a sealant layer 63. Are laminated bodies in this order, and the thickness direction distance t61 from the outer surface of the film 6 to the metal foil layer 62 is 6.5 μm or more and 5000 μm or less. Therefore, melting of the film 6 can be suppressed, and the pouch 1 (container) having high heating performance can be provided.

  Further, the pouch 1 of the present embodiment includes a grounding surface portion 43 and a non-grounding surface portion 44, and the first bottom joint portion 14 and the second bottom joint portion 16 are not formed on the grounding surface portion 43 and are not grounded. It is formed on the surface portion 44. When the bottom joint portion is formed on the ground surface portion 43, when the electromagnetic induction heating cooking is performed, the bottom joint portion may be overheated and the pouch may be melted. The pouch 1 of the present embodiment can suppress overheating because no joint is formed on the ground surface portion 43.

  The embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiments, and can be implemented in various forms. The configuration of the bottom surface is not limited to the configuration of the bottom surface in the embodiment. The shape of the ground surface portion 43 is not limited to a rectangle, and may be, for example, a circle, a triangle, or a hexagon. The container is not limited to the pouch as in the above embodiment.

The present invention will be specifically described below with reference to examples and comparative examples. However, the present invention is not limited to the examples.
Heatability was confirmed when the distance in the thickness direction from the outer surface of the film constituting the grounding surface portion of the bottom surface of the container to the metal foil layer was changed.

[Experimental conditions]
As the container, a pouch having a grounding surface portion 43 having a rectangular bottom surface 4 and two non-grounding surface portions 44 and 44 having an isosceles triangle shape as shown in FIG. 10 was used.
As a film capable of electromagnetic induction heating, a film of polyethylene terephthalate (PET) / aluminum foil (thickness: 7 μm) / stretched nylon (ONy) (thickness: 15 μm) / unstretched propylene (CPP) (thickness: 50 μm) from the outside. Use. Note that “/” is used as a notation indicating a boundary between layers when listing layers.

As shown in [Table 1] below, a sample was prepared in which the thickness direction distance t61, that is, the thickness of polyethylene terephthalate (PET) as the base material layer 61 was changed. When the thickness direction distance t61 is 0 μm, the base material layer 61 does not exist.
The area of the ground surface portion 43 was 110 cm ² , and the non-ground surface portion 44 was 55 cm ² . The area of the non-grounding surface portion 44 is the sum of the areas of the two non-grounding surface portions 44 and 44.
Water was accommodated as a content in the container accommodating portion. The amount of water was 300 ml.

  As an electromagnetic cooker (IH heater), an IH cooker (model number IC-D10B) manufactured by Sanyo Electric Co., Ltd. was used. The output was 400W.

〔Evaluation item〕
[Time to reach temperature]
The grounding surface portion 43 of the container was placed on the placement surface of the electromagnetic cooker, and the time (seconds) from the start of heating until the water reached 80 ° C. or 95 ° C. was measured.

  In addition, when the grounding surface portion 43 of the container is placed on the placement surface of the electromagnetic cooking device, whether or not a sensor that allows the heating operation (generation of magnetic lines of force) of the electromagnetic cooking device reacts is any example. The sensor responded (= heatable). Therefore, the response of the sensor is not shown in [Table 1].

〔Comprehensive evaluation〕
Comprehensive evaluation was performed as follows.
・ "S"
Within 5 minutes, water could be heated to 95 ° C or higher.
・ "A"
Water could be heated to 95 ° C. or more within 5 minutes over 5 minutes.
・ "B"
The water could be heated to 95 ° C. or more within 6 minutes exceeding 6 minutes.
・ "X"
The film partially melted due to overheating, or water could not be heated to 95 ° C. or more within 15 minutes.

The experimental results are shown in [Table 1].

1,1A, 1B, 1C Pouch (container)
2 Front surface 3 Back surface 4 Bottom surface 5 Housing portion 6 Film 20 Top surface sheet 30 Back surface sheet 40 Bottom surface sheet 41 First bottom surface portion 42 Second bottom surface portion 43 Ground surface portion 44 Non-ground surface portion 61 Base layer 62 Metal foil layer 63 Sealant layer

Claims (3)

A container having a bottom surface that is divided into a ground surface portion that functions as a ground surface and a non-ground surface portion other than the ground surface portion;
The grounding surface portion is composed of a film capable of electromagnetic induction heating,
The film is a laminate in which a base material layer, a metal foil layer, and a sealant layer are laminated in this order from at least the outside.
A container in which a distance in a thickness direction from an outer surface of the film to the metal foil layer is 6.5 μm or more and 5000 μm or less.   The container according to claim 1, wherein the distance in the thickness direction is 6.5 μm or more and 250 μm or less.   The container according to claim 1, wherein the base material layer includes a plastic film.

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