Heated food packaging

Abstract

A packaging material for a food item to be heated, which comprises a sheet-like main body part capable of enclosing the food item to be heated and a penetration part penetrating through the sheet-like main body part, and which is used when heating the food item in the enclosed state with one surface of the sheet-like main body part facing the outside, said packaging material being further provided with a sheet-like cover part disposed so as to cover the penetration part and allowing water vapor to pass therethrough.

Description

Cross-reference to related applications

[0001] This application claims the priority of Japanese Patent Application No. 2020-94248 and PCT / JP2020 / 31895, and is incorporated by reference into the description of this application specification.

Technical Field

[0002] The present invention relates to a packaging material for heated foods that wraps heated foods.

Background Art

[0003] Conventionally, foods such as hamburgers and sandwiches have been sold at stores in a state of being wrapped in a sheet-like packaging material. As such a packaging material, there is known one including a sheet-like main body portion having a size capable of wrapping food, a through portion penetrating the sheet-like main body portion, and a sheet-like sealing portion covering the through portion to seal the through portion (see Patent Document 1). When taking out the food from the inside of the package in which the food is packaged with such a packaging material, the sheet-like main body portion is cut starting from the through portion, and the packaging material is removed from the food.

[0004] Foods such as hamburgers and sandwiches that are eaten after being heated may be heated in a state of being wrapped in a packaging material. In this case, the water vapor generated from the food tends to stay inside the package. For this reason, there is a risk that the internal pressure of the package rises and the package is damaged, or that unnecessary water vapor contacts the food and impairs the texture and taste of the food.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Therefore, the object of the present invention is to provide a packaging material for heated foods that allows water vapor to be discharged from the inside of a package in which food is wrapped in a sheet-like packaging material. [Means for solving the problem]

[0007] The packaging material for heated foods according to the present invention is A sheet-like main body capable of enclosing food to be heated, A through portion that penetrates the sheet-like main body, A sheet-like covering portion is arranged to cover the aforementioned penetration portion and is permeable to water vapor, It is equipped with, This device is used when heating food while the food is wrapped in the sheet-like main body so that one side of the sheet faces outwards.

[0008] The packaging material for heated foods according to the present invention is The aforementioned sheet-like covering portion is formed using a nonwoven fabric. The system further comprises a sheet-like overlapping portion, positioned away from the aforementioned sheet-like covering portion, so as to overlap the side of the sheet-like main body that is covered by the sheet-like covering portion. It is preferable.

[0009] The packaging material for heated foods according to the present invention is A handle is formed at the end of the sheet-like main body that forms the through portion. The sheet-like main body can be cut starting from the through portion. It is preferable.

[0010] Other packaging materials for heated foods according to the present invention are: A sheet material capable of enclosing food to be heated, the sheet material having a portion that is more easily broken than other portions, A sheet-like covering portion is positioned to cover the easily breakable portion and is permeable to water vapor, It is equipped with, It is configured such that a sheet-like main body portion having a through portion is formed by breaking the easily breakable portion in a state where the food is wrapped to form a through portion that penetrates the sheet material. It is used when heating the food in a state where the food is wrapped.

Brief Description of the Drawings

[0011] [Figure 1] A perspective view showing a packaging material for heated food according to a first embodiment of the present invention. [Figure 2] A perspective view showing a package formed by packaging food with the packaging material for heated food according to the same embodiment. [Figure 3] A perspective view showing a state where a sheet-like covering portion is removed from a packaging material for heated food according to a second embodiment of the present invention. [Figure 4] A perspective view showing the packaging material for heated food according to the same embodiment. [Figure 5] A perspective view showing a packaging material for heated food according to another embodiment of the present invention. [Figure 6] A perspective view showing a package formed by packaging food with the packaging material for heated food according to the same embodiment. [Figure 7] A perspective view showing a package formed by packaging food with a packaging material for heated food according to still another embodiment of the present invention.

Modes for Carrying Out the Invention

[0012] Hereinafter, embodiments of a packaging material for heated food according to the present invention will be described based on the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals and their descriptions will not be repeated. Also, in the following description, the one direction is the direction along the x-axis in the coordinate axes of each figure, and the other direction intersecting the one direction is the direction along the y-axis in the coordinate axes of each figure.

[0013] <First Embodiment> The packaging material 1 for heated food according to this embodiment is formed in a sheet shape as shown in FIG. 1. Further, the packaging material 1 for heated food includes a sheet-like main body portion 2 that wraps food (e.g., hamburgers, sandwiches, etc.) such that one surface faces the outside, and a through portion 2a that penetrates the sheet-like main body portion 2. Further, the packaging material 1 for heated food further includes a sheet-like covering portion 3 that covers the through portion 2a, and a sheet-like overlapping portion 4 that is disposed so as to overlap the surface of the sheet-like main body portion 2 on the side where the sheet-like covering portion 3 is installed.

[0014] The sheet-like main body portion 2 is at least partially dividable in the other direction (hereinafter also referred to as the second direction) that intersects with one direction (hereinafter also referred to as the first direction). Specifically, the sheet-like main body portion 2 is at least partially divided in the second direction by being cut on a cutting planned line (virtual line) extending in the first direction. In this embodiment, the sheet-like main body portion 2 includes a cut tape 2b disposed so as to extend in the first direction. The cut tape 2b is disposed at a substantially central portion of the sheet-like main body portion 2 in the second direction. Then, by cutting the sheet-like main body portion 2 along the cut tape 2b on both sides of the cut tape 2b, at least a part of the sheet-like main body portion 2 is divided in the second direction.

[0015] The through portion 2a is formed in a region inside the outer peripheral end portion of the sheet-like main body portion 2. Further, the through portion 2a is formed on one end side rather than the central portion of the sheet-like main body portion 2 in the first direction, and is formed at a substantially central portion of the sheet-like main body portion 2 in the second direction. Further, the through portion 2a is formed at a position that does not overlap with a region other than the region of the sheet-like main body portion 2 including the through portion 2a when the food is wrapped with the packaging material 1 for heated food.

[0016] Furthermore, the through-hole 2a is composed of a cut line that penetrates the sheet-like main body 2. This cut line is formed in a concave shape (U-shape) that opens in the first direction. As a result, a gripping portion 2c is formed at the end of the sheet-like main body 2 that forms the through-hole 2a (specifically, on the inside of the through-hole 2a (cut line)) that can be grasped with fingers or the like. The through-hole 2a (cut line) also intersects with the cut tape 2b at a position between the two ends of the through-hole 2a (in other words, the gripping portion 2c and the cut tape 2b overlap). As a result, by pulling the gripping portion 2c from one end to the other in the first direction (specifically, towards the side where the concave cut line opens), the sheet-like main body 2 is cut starting from both ends of the through-hole 2a (cut line) (specifically, cut along the cut tape 2b on both sides of the cut tape 2b). As a result, a portion of the sheet-like main body 2 (specifically, the area on the other end side of the through portion 2a in the first direction) is divided in the second direction.

[0017] The sheet-like covering portion 3 is positioned so as to overlap the area inside the outer peripheral edge of the sheet-like main body portion 2. Furthermore, the sheet-like covering portion 3 is positioned towards one end of the center of the sheet-like main body portion 2 in the first direction, and is positioned approximately in the center of the sheet-like main body portion 2 in the second direction. In addition, the sheet-like covering portion 3 is positioned so as to overlap the other surface of the sheet-like main body portion 2 (specifically, the surface that faces the food when wrapping food) (in other words, so as to cover the penetration portion 2a from the other surface side). Furthermore, the sheet-like covering portion 3 is positioned so as to cover a part of the cut tape 2b (specifically, the part located inside the tab portion 2c) (specifically, so as to overlap with the cutting position of the sheet-like main body portion 2).

[0018] Furthermore, the sheet-like covering portion 3 is permeable to water vapor. The sheet material constituting the sheet-like covering portion 3 is not particularly limited, and for example, nonwoven fabric, a sheet material having multiple through holes, paper, etc., can be used, but it is preferable to use nonwoven fabric in that it can suppress foreign matter such as dust from permeating the sheet-like covering portion 3 and contaminating the food.

[0019] At least a portion of the sheet-like covering portion 3 is bonded to the sheet-like main body portion 2. For example, an annular region along the outer circumference of the sheet-like covering portion 3 (for example, a rectangular frame-shaped region) may be bonded to the sheet-like main body portion 2, or the entire surface of one side of the sheet-like covering portion 3 may be bonded to the sheet-like main body portion 2. The method of bonding the sheet-like covering portion 3 and the sheet-like main body portion 2 is not particularly limited, and for example, heat sealing, ultrasonic sealing, adhesive, etc., can be used.

[0020] The thickness of the sheet-like covering portion 3 is not particularly limited. For example, the thickness of the sheet-like covering portion 3 may be approximately the same as the thickness of the sheet-like overlapping portion 4, may be thicker than the sheet-like overlapping portion 4, or may be thinner than the sheet-like overlapping portion 4. A specific example of the thickness of the sheet-like covering portion 3 is 20 to 300 μm (specifically, about 150 μm). Note that approximately the same thickness means that the ratio of the thickness of the sheet-like covering portion 3 to the thickness of the sheet-like overlapping portion 4 is 0.9 to 1.1.

[0021] The sheet-like overlapping portion 4 is formed in a strip shape extending in the first direction. Furthermore, the sheet-like overlapping portion 4 is positioned across the entire area between both ends of the sheet-like main body portion 2 in the first direction. Additionally, the sheet-like overlapping portion 4 is positioned at a distance from the sheet-like covering portion 3. Specifically, the sheet-like overlapping portion 4 is positioned at a distance from the sheet-like covering portion 3 towards the end of the sheet-like main body portion 2 in the second direction. More specifically, the sheet-like overlapping portion 4 is positioned towards the end of the sheet-like main body portion 2 in the second direction, rather than towards the center.

[0022] Furthermore, the sheet-like overlapping portion 4 is positioned to overlap the other side of the sheet-like main body portion 2 (the side that faces the food when packaging food). Also, the sheet-like overlapping portion 4 is positioned so as not to overlap with the cutting position of the sheet-like main body portion 2 (the cutting position extending in the first direction) (specifically, at a position spaced apart in the second direction from the cut tape 2b). In this embodiment, the packaging material 1 for heated foods has two sheet-like overlapping portions 4, and the two sheet-like overlapping portions 4 are spaced apart in the second direction (specifically, overlapping with each of the ends of the sheet-like main body portion 2 in the second direction). In the second direction, the through portion 2a, the sheet-like covering portion 3, and the cut tape 2b are located between the two sheet-like overlapping portions 4.

[0023] At least a portion of the sheet-like overlapping portion 4 is bonded to the sheet-like main body portion 2. For example, the portion of the sheet-like overlapping portion 4 that is inside both ends in the second direction may be bonded to the sheet-like main body portion 2 along the first direction, or the entire surface of one side of the sheet-like overlapping portion 4 may be bonded to the sheet-like main body portion 2. The method of bonding the sheet-like overlapping portion 4 and the sheet-like main body portion 2 is not particularly limited, and for example, heat sealing, ultrasonic sealing, adhesive, etc., can be used.

[0024] Furthermore, the thickness of the sheet-like overlapping portion 4 is not particularly limited. For example, the thickness of the sheet-like overlapping portion 4 may be approximately the same as the thickness of the sheet-like covering portion 3, or it may be thinner or thicker than the thickness of the sheet-like covering portion 3. Also, the thickness of the sheet-like overlapping portion 4 may be approximately the same as the thickness of the cut tape 2b, or it may be thinner or thicker than the thickness of the cut tape 2b. Note that "approximately the same" means that the ratio of the thickness of the sheet-like overlapping portion 4 to the thickness of the sheet-like covering portion 3 (or cut tape 2b) is 0.9 to 1.1.

[0025] The sheet material constituting the sheet-like overlapping portion 4 is not particularly limited, and for example, the same or different sheet material as the sheet-like main body portion 2 and / or cut tape 2b can be used.

[0026] When packaging food using the heating food packaging material 1 configured as described above, as shown in Figure 2, the heating food packaging material 1 (specifically, the sheet-like main body 2) is wrapped around the food X along its shape, with one side of the sheet-like main body 2 (the side on which the sheet-like covering portion 3 is not overlapped) facing outwards. This forms a package 10 in which the food X is wrapped in the heating food packaging material 1. At this time, when the package 10 is viewed from the front, the through portion 2a is positioned to overlap with the end or side of the food X (in other words, the through portion 2a is located near the end or on the side of the package 10), so that when the food X is heated inside the package 10, as described later, water vapor can be effectively released from the through portion 2a. In this case, the sheet-like covering portion 3 may be located from near the end to the side of the package 10 when the package 10 is viewed from the front, or it may be located near the end or on the side of the package 10.

[0027] With the packaging 10 formed as described above, the food X is heated by a heating device such as a microwave oven or an infrared heater. When consuming the food X heated inside the packaging 10, the tab 2c is pulled along the cut tape 2b. This causes the sheet-like main body 2 to be cut along the cut tape 2b on the planned cutting lines on both sides of the cut tape 2b, starting from the penetration 2a (specifically, both ends of the cut line). This divides a portion of the heated food packaging material 1 in a second direction. By separating one side of the heated food packaging material 1 from the other side in a second direction, with the cut portion as the boundary, the food X can be exposed from the packaging 10 and consumed.

[0028] As described above, when the food X is exposed from the packaging 10, if the sheet-like covering part 3 is made of nonwoven fabric, the sheet-like covering part 3 is flexible, making it easy to move it aside so as not to get in the way when eating the food X. Also, if the sheet-like covering part 3 is made of nonwoven fabric, it is easy to see, which helps to prevent accidental ingestion of the sheet-like covering part 3. Furthermore, when the food X is exposed from the packaging 10 as described above, the sheet-like covering part 3 is connected to the sheet-like main body part 2 on one or the other side of the packaging material for heated foods 1, thus preventing the sheet-like covering part 3 and the sheet-like main body part 2 from becoming separate waste.

[0029] As described above, the packaging material 1 for heated foods according to this embodiment allows water vapor to be released from the inside of the packaging body 10 even when the food X is heated while the food X is wrapped inside the packaging body 10.

[0030] In other words, when the food X is heated while the packaging 10 is formed, the water vapor discharged from the perforation 2a permeates the sheet-like covering 3, allowing the water vapor to be discharged to the outside of the packaging 10. Furthermore, since the perforation 2a is covered by the sheet-like covering 3, it is possible to prevent foreign matter from entering the packaging 10 through the perforation 2a.

[0031] Furthermore, by positioning the sheet-like overlapping portion 4 at a distance from the sheet-like covering portion 3 and overlapping the side of the sheet-like main body portion 2 that is covered by the sheet-like covering portion 3, the difference in thickness between the portion of the heating food packaging material 1 with the sheet-like covering portion 3 and the portion with the sheet-like overlapping portion 4 is reduced. In other words, the sheet-like overlapping portion 4 allows for adjustment of the thickness of the portion of the heating food packaging material 1 that does not have the sheet-like covering portion 3. This makes it possible to prevent difficulty in stacking multiple heating food packaging materials 1 (for example, when stacking individual sheets or when winding up a long piece formed by multiple sheets connected together) or difficulty in maintaining the stacked state.

[0032] Furthermore, a gripping portion 2c is formed at the end of the sheet-like main body portion 2 that forms the through portion 2a. In other words, the portion of the sheet-like main body portion 2 adjacent to the through portion 2a becomes the gripping portion 2c. Therefore, by gripping and pulling the gripping portion 2c, the sheet-like main body portion 2 can be cut starting from the through portion 2a.

[0033] <Second Embodiment> As shown in Figures 3 and 4, the packaging material 200 for heated foods according to this embodiment differs from the packaging material 1 for heated foods according to the first embodiment in the configuration of the through-hole 2a and the sheet-like covering portion 3. Therefore, the differences from the first embodiment will be described below.

[0034] In this embodiment, as shown in Figure 3, the through-holes 2a are formed at positions away from the center of the sheet-like main body 2 in the second direction. Furthermore, multiple through-holes 2a are formed at intervals in the first direction. Specifically, multiple through-holes 2a are formed at intervals in the first direction over substantially the entire area of ​​the sheet-like main body 2 in the first direction. Thus, in this embodiment, the sheet-like main body 2 is provided with perforated through-holes 2d formed from multiple through-holes 2a, which extend in the first direction. At least two of these perforated through-holes 2d are formed at intervals in the second direction such that the center of the sheet-like main body 2 in the second direction is located between them. Specifically, multiple (specifically, two) perforated through-holes 2d are formed at positions away from the center of the sheet-like main body 2 in the second direction towards one end in the second direction. Furthermore, multiple (specifically, two) perforated through-holes 2d are formed at positions away from the center of the sheet-like main body 2 in the second direction towards the other end in the second direction.

[0035] In this embodiment, as shown in Figures 3 and 4, the sheet-like covering portion 3 is positioned away from the center of the sheet-like main body portion 2 in the second direction. The sheet-like covering portion 3 is positioned to cover a plurality of through portions 2a (specifically, at least two through portions 2a that constitute the perforated through portions 2d). The sheet-like covering portion 3 is also formed in a strip shape extending in the first direction. It covers at least one (specifically, two) perforated through portions 2d (specifically, it covers the entire portion). At least two sheet-like covering portions 3 are positioned with a gap between them in the second direction, such that the center of the sheet-like main body portion 2 in the second direction is located between them. Each of the at least two sheet-like covering portions 3 positioned with a gap in the second direction covers at least one (specifically, two) perforated through portions 2d.

[0036] In this embodiment, the sheet-like main body portion 2 is provided with a cutting through portion 2e that is formed to penetrate the sheet-like main body portion 2 at a position away from the through portion 2a (specifically, the perforated through portion 2d) and serves as the starting point for cutting the sheet-like main body portion 2. Specifically, the sheet-like main body portion 2 is provided with the cutting through portion 2e on the central side in the second direction, relative to the through portion 2a (specifically, the perforated through portion 2d).

[0037] The cutting through portion 2e is formed in a region inward from the outer peripheral edge of the sheet-like main body portion 2. Furthermore, the cutting through portion 2e is formed on one end side of the center of the sheet-like main body portion 2 in the first direction, and is formed approximately in the center of the sheet-like main body portion 2 in the second direction. In addition, the cutting through portion 2e is formed in a position that does not overlap with the region of the sheet-like main body portion 2 other than the region containing the cutting through portion 2e when food is wrapped in the food packaging material 200 for heated foods.

[0038] Furthermore, the cutting through portion 2e is composed of a cut line that penetrates the sheet-like main body portion 2. This cut line is formed in a concave shape (U-shape) that opens in the first direction. As a result, a gripping portion 2c is formed at the end of the sheet-like main body portion 2 that forms the cutting through portion 2e (specifically, on the inside of the cutting through portion 2e (cut line)) that can be grasped with fingers or the like. Also, the cutting through portion 2e (cut line) intersects with the cut tape 2b at a position between both ends of the cutting through portion 2e (in other words, the gripping portion 2c and the cut tape 2b overlap). As a result, by pulling the gripping portion 2c from one end to the other end of the sheet-like main body portion 2 in the first direction (specifically, towards the side where the concave cut line opens), the sheet-like main body portion 2 is cut starting from both ends of the cutting through portion 2e (cut line) (specifically, cut along the cut tape 2b on both sides of the cut tape 2b). As a result, a portion of the sheet-like main body 2 (specifically, the area on the other end side of the cutting penetration portion 2e in the first direction) is divided in the second direction.

[0039] The packaging material 200 for heated foods according to this embodiment includes a sheet-like closing portion 5 that closes the cutting penetration portion 2e.

[0040] The sheet-like closure portion 5 is positioned so as to overlap the area inside the outer peripheral edge of the sheet-like main body portion 2. Furthermore, the sheet-like closure portion 5 is positioned towards one end of the center of the sheet-like main body portion 2 in the first direction, and is positioned approximately in the center of the sheet-like main body portion 2 in the second direction. In addition, the sheet-like closure portion 5 is positioned so as to overlap the other surface of the sheet-like main body portion 2 (specifically, the surface that faces the food when wrapping food) (in other words, so as to cover the cutting penetration portion 2e from the other surface side). Furthermore, the sheet-like closure portion 5 is positioned so as to cover a part of the cut tape 2b (specifically, the part located inside the tab portion 2c) (specifically, so as to overlap with the cutting position of the sheet-like main body portion 2).

[0041] At least a portion of the sheet-like closure portion 5 is bonded to the sheet-like main body portion 2. For example, an annular region along the outer circumference of the sheet-like closure portion 5 (for example, a rectangular frame-like region) may be bonded to the sheet-like main body portion 2, or the entire surface of one side of the sheet-like closure portion 5 may be bonded to the sheet-like main body portion 2. The method of bonding the sheet-like closure portion 5 and the sheet-like main body portion 2 is not particularly limited, and for example, heat sealing, ultrasonic sealing, adhesive, etc., can be used.

[0042] The sheet material constituting the sheet-like closure portion 5 is not particularly limited, and for example, a resin sheet can be used. The thickness of the sheet-like closure portion 5 is not particularly limited. For example, the thickness of the sheet-like closure portion 5 may be approximately the same as the thickness of the sheet-like covering portion 3, it may be thicker than the sheet-like covering portion 3, or it may be thinner than the sheet-like covering portion 3. The specific thickness of the sheet-like closure portion 5 may be, for example, 10 to 20 μm, 10 to 15 μm, 16 to 20 μm, 20 to 40 μm, or 60 μm or more. Approximately the same thickness means that the ratio of the thickness of the sheet-like closure portion 5 to the thickness of the sheet-like covering portion 3 is 0.9 to 1.1.

[0043] In this embodiment, as described above, at least two strip-shaped sheet-like covering portions 3 are arranged with a gap between them in the second direction, so that the two sheet-like covering portions 3 have the same effect as the sheet-like overlapping portion 4 in the first embodiment (this effect will be described later). For this reason, this embodiment can be configured without the sheet-like overlapping portion 4.

[0044] Furthermore, since multiple through-holes 2a are formed at intervals in the first direction, perforated through-holes 2d extending in the first direction are formed, the area in the packaging 10 from which water vapor can be discharged becomes relatively large, allowing for more effective discharge of water vapor to the outside of the packaging 10.

[0045] Furthermore, by forming the perforated perforations 2d to extend in the first direction, the perforated perforations 2d can be arranged in a U-shape when the packaging 10 is formed. Then, by placing at least a portion of the food X between the U-shaped perforated perforations 2d (in other words, arranging the perforated perforations 2d from one side to the opposite side of the food X), water vapor can be more effectively released to the outside of the packaging 10.

[0046] Furthermore, because the sheet-like covering portion 3, made of nonwoven fabric, is formed in a strip shape extending in the first direction, moisture (e.g., water droplets) inside the packaging 10 can be absorbed more effectively by the sheet-like covering portion 3. This helps to prevent the food X from deteriorating or having its texture and flavor impaired due to moisture.

[0047] Furthermore, since the perforated perforations 2d are formed at a position away from the cutting perforations 2e, which serve as the starting point for cutting the sheet-like main body 2, water vapor is discharged at a position away from the cutting perforations 2e. As a result, even if fingers are brought close to the cutting perforations 2e in order to cut the sheet-like main body 2, burns or wetting due to water vapor can be prevented.

[0048] It should be noted that the packaging material for heated foods according to the present invention is not limited to the above embodiments, and various modifications are possible without departing from the spirit of the present invention. Furthermore, the configurations and methods of the above-described multiple embodiments may be arbitrarily adopted and combined (configurations and methods of one embodiment may be applied to configurations and methods of other embodiments), and of course, configurations and methods related to the various modification examples described below may be arbitrarily selected and adopted in the configurations and methods of the above-described embodiments.

[0049] For example, in the above embodiment, the sheet-like main body 2 is cut starting from the through portion 2a (cut line), but it is not limited to this, and for example, the sheet-like main body 2 may be cut starting from a break portion (cut line, perforation, half-cut, etc.) formed at a position away from the through portion 2a.

[0050] Furthermore, in the above embodiment, the sheet-like covering portion 3 is positioned to overlap with the cutting position of the sheet-like main body portion 2, but this is not limited to this, and for example, it may be positioned at a location that does not overlap with the cutting position of the sheet-like main body portion 2.

[0051] Furthermore, in the above embodiment, the sheet-like covering portion 3 is arranged to overlap the other side of the sheet-like main body portion 2 (the side that faces the food when food is wrapped), but the invention is not limited to this, and for example, the sheet-like covering portion 3 may be arranged to overlap one side of the sheet-like main body portion 2 (the side that faces outwards when food is wrapped).

[0052] Furthermore, in the above embodiment, the through portion 2a is composed of a cut line, but it is not limited to this, and may be composed of, for example, at least one through hole.

[0053] Furthermore, as another embodiment of the present invention, a packaging material 100 for heated foods includes, for example, a sheet material 20 capable of enclosing a food X to be heated, which has an easily breakable portion 20a in a part thereof having a weaker breaking strength than other parts, and a sheet-like covering portion 3 arranged to cover the easily breakable portion 20a and permeable to water vapor. As shown in Figure 6, such a packaging material 100 for heated foods is configured such that, when the food X is wrapped (when the packaging body 1000 is formed), the easily breakable portion 20a is broken to form a through portion 2a, as shown in Figure 2, thereby forming a sheet-like main body portion 2 having the through portion 2a. The timing of breaking the easily breakable portion 20a is not particularly limited and may be, for example, immediately before heating the food X, or during the heating of the food X. The method for breaking the easily breakable portion 20a is not particularly limited. For example, the easily breakable portion 20a may be broken by pinching the vicinity of the easily breakable portion 20a with fingers and pulling, or by the pressure of the steam generated when the food is heated. The easily breakable portion 20a is not particularly limited and can be a half-cut or a perforation. The shape of the easily breakable portion 20a is not particularly limited, but it is preferably a shape that corresponds to the shape of the through portion 2.

[0054] With the heated food packaging material 100 configured as described above, the perforation portion 2a can not be formed until the food X is heated, as shown in Figure 6, thus preventing foreign matter from entering the packaging 1000. Furthermore, when heating or during heating the food X, the easily breakable portion 20a can be broken to form the perforation portion 2a, as shown in Figure 2, allowing water vapor to be released from the perforation portion 2a.

[0055] Furthermore, in the above embodiment, the sheet-like overlapping portion 4 is continuously arranged over the entire area between both ends of the sheet-like main body portion 2 in the first direction, but it is not limited to this, and for example, multiple sheet-like overlapping portions 4 may be arranged at intervals in the first direction. Also, in the above embodiment, it is configured to have a pair of sheet-like overlapping portions 4, but it is not limited to this, and for example, it may be configured to have only one sheet-like overlapping portion 4.

[0056] Furthermore, in the above embodiment, the sheet-like overlapping portion 4 is formed separately from the sheet-like main body portion 2, but this is not limited to this, and for example, it may be formed integrally with the sheet-like main body portion 2. Specifically, the opposing ends of a single sheet material forming the sheet-like main body portion 2 and the sheet-like overlapping portion 4 may be folded back, so that the folded ends form the sheet-like overlapping portion 4 and the other parts form the sheet-like main body portion 2.

[0057] The positions for forming the through-hole 2a in the sheet-like main body 2 and the positions for arranging the sheet-like covering 3 are not particularly limited, but it is preferable that the positions for forming the through-hole 2a and the positions for arranging the sheet-like covering 3 do not overlap with other positions in the sheet-like main body 2.

[0058] Furthermore, in the above embodiment, the region on the other end side of the through portion 2a of the sheet-like main body 2 in the first direction (i.e., a part of the sheet-like main body 2) is separable in the second direction, but the invention is not limited to this, and for example, the entire sheet-like main body 2 may be separable in the second direction.

[0059] Furthermore, in the above embodiment, the gripping portion 2c is formed on the inside of the concave (U-shaped) through portion 2a, but the invention is not limited to this. For example, the through portion 2a may be formed in a straight line, and the end adjacent to the straight through portion 2a (at least one of the ends facing each other across the through portion 2a) may be made into the gripping portion 2c.

[0060] Furthermore, in the above embodiment, the through portion 2a is composed of continuous cut lines, but is not limited to this, and may be composed of intermittently formed cut lines (in other words, having partially uncut portions) as shown in Figure 7. Specifically, the through portion 2a may be configured to include a concave (U-shaped) cut line 2a1 and two straight cut lines 2a2 formed at positions spaced apart (approximately 0.5 mm to 2 mm apart) from both ends of the cut line 2a1 in the direction of opening the cut line 2a1, and extending in the direction of opening the cut line 2a1. Between both ends of the concave cut line 2a1 and the straight cut lines 2a2, portions of the sheet material that have not been cut (uncut portions) are formed. This makes it possible to prevent the sheet-like main body portion 2 from being unintentionally cut starting from both ends of the through portion 2a (specifically, the ends of the straight cut lines 2a2). [Explanation of symbols]

[0061] 1,100,200…Packaging material for heated foods, 2…Sheet-like main body, 20…Sheet material, 2a…Penetration part, 20a…Easy-tear part, 2b…Cut tape, 2c…Tap part, 2d…Perforated penetration part, 2e…Penetration part for cutting, 3…Sheet-like covering part, 4…Sheet-like overlapping part, 5…Sheet-like closing part, 10,1000…Packaging body, X…Food

Claims

[Claim 1] A heated food packaging comprising a food to be heated and a sheet-like heated food packaging material, wherein the heated food packaging material deforms to conform to the shape of the food and wraps the food, The aforementioned packaging material for heated foods is A sheet-like main body portion capable of wrapping the food in accordance with its shape, A through portion that penetrates the sheet-like main body, A sheet-like covering portion is arranged to cover the aforementioned penetration portion and is permeable to water vapor, It is equipped with, The aforementioned through-hole has a through-hole for steam release and a through-hole for cutting. The aforementioned steam venting holes are formed in a perforated pattern by penetrating the sheet-like main body at multiple locations with intervals between them in one direction, and extend across the entire area of ​​the sheet-like main body in one direction. The aforementioned cutting penetration is formed to penetrate the sheet-like main body at a position away from the steam venting penetration in a direction perpendicular to one direction of the sheet-like main body, and is configured to cut the sheet-like main body along one direction. The sheet-like covering portion is arranged to cover the entire steam venting penetration portion. The food is wrapped in the packaging material for heated foods such that one side of the sheet-like main body is facing outwards. The aforementioned steam venting holes are positioned to conform to the shape of the food. Heated food packaging.

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