JP7322385B2 - package - Google Patents

Description

The present invention relates to packages.

Packages are known that are configured to automatically expel water vapor when the internal pressure of the tray increases due to heating in a microwave oven. For example, Patent Document 1 discloses a container (13) including a storage space for storing contents, a microwave heating package (9) sealed with the top surface of the container (13) so that the storage space is closed, and a top Disclosed is a packaging container having a heat-sealed portion (14) where a surface and a microwave heating package (9) are sealed. The microwave heating package (9) comprises a sealing layer sealed to the top surface of the container (13), and a coating layer (3) laminated on the sealing layer and generating heat by microwaves. When the packaging container of Patent Document 1 is heated in a microwave oven, the coating layer (3) generates heat, and the heat-sealed portion (14) near the coating layer (3) weakens, resulting in a microwave heat-generating package (9 ) and the container (13), an opening is formed through which water vapor is discharged.

JP 2017-159912 A

In the packaging container described above, when the water vapor discharged through the opening is cooled, water droplets may adhere to the microwave heating package (9) and the container (13), blocking the opening. When the air in the housing space of the container (13) is cooled while the opening is closed, the volume of the air in the housing space decreases, depressurizing the housing space and possibly deforming the container (13).

(1) The package according to the present invention includes a tray including a storage space for storing contents, a lid sealed to the top surface of the tray so as to close the storage space, and a seal between the top surface and the lid. The seal portion includes a general seal portion extending along the outer shape of the tray, and a vapor-permeable seal portion projecting inwardly of the tray from the general seal portion, and the The lid includes a sealant layer that is sealed with the top surface, and a heat generating layer that is laminated on the sealant layer and generates heat by microwaves. The lid is provided so as to overlap with the portion, and the lid is deformed so that the steam passage formed between the lid and the top surface is not blocked when the vapor passage planned seal portion is peeled off.
According to the above package, the internal pressure of the tray concentrates on the steam-prepared sealing portion when heated in a microwave oven. For this reason, the vapor passage-planned seal portion is peeled off earlier than the general seal portion, and a vapor passage is formed in the peeled portion to communicate the housing space of the tray with the outside. When the heat-generating layer generates heat, the lid deforms so as not to block the steam passage. maintained. Therefore, even if the air in the accommodation space is cooled, the accommodation space is not decompressed and the tray is less likely to deform. In addition, when the heat generating layer is provided so as to partially overlap the vapor-permeable seal portion, the lid deforms more greatly than when the heat-generating layer is provided so as to overlap the entire portion of the vapor-permeable seal portion, resulting in a larger area. It was confirmed that a steam passage was formed and the tray was not easily deformed.

(2) In a preferred example, in the package described in (1), the heat generating layer is provided so as to straddle the vapor passage-planned seal portion in a plan view of the tray.
Since the heat-generating layer is provided over a wide area, the lid is greatly deformed and the area of the steam passage is widened. Therefore, the tray is more difficult to deform.

(3) In a preferred example, in the package according to (1) or (2), the heat generating layer is provided so as to overlap at least the inner tip of the vapor-passing seal portion in plan view of the tray.
Since the portion of the sealing portion to be steamed that is to be peeled first is deformed, the steam passage is more difficult to be clogged. Therefore, the tray is more difficult to deform.

(4) In a preferred example, in the package according to any one of (1) to (3), the tray is provided with a general tray portion provided with the general seal portion, and the vaporization planned seal portion, The heat-generating layer is provided so as to straddle the tray portion to be ventilated in a plan view of the tray.
Since the heat-generating layer is provided over a wide area, the lid is greatly deformed and the area of the steam passage is widened. Therefore, the tray is more difficult to deform.

(5) In a preferred example, in the package according to any one of (1) to (4), the heat generating layer contains heat generating ink, and the dot area ratio of the heat generating ink is in the range of 50% to 100%. included.
It was confirmed that when the dot area ratio of the heat-generating ink is within the above range, the lid is greatly deformed and the area of the steam passage is widened. Therefore, the tray is more difficult to deform.

According to the package according to the present invention, the tray is less likely to deform.

The perspective view of the package of embodiment. FIG. 2 is a plan view of the package of FIG. 1; FIG. 3 is a cross-sectional view taken along line D3-D3 in FIG. 2; FIG. 2 is a perspective view of the package in FIG. 1 in a state in which a part of the steaming planned sealing portion is peeled off; 5 is a front view of the package shown in FIG. 4 in a state in which the peeling portion is deformed; The top view of the package of a modification.

(embodiment)
FIG. 1 is a perspective view of a package 1 containing a content 100 to be heated in a microwave oven. The content 100 is, for example, a chilled lunch. Examples of chilled bento are beef bowl, oyakodon, Chinese rice bowl, and curry rice. The main elements constituting the package 1 are the tray 10, the lid 20, and the sealing portion 30. As shown in FIG.

The material constituting the tray 10 can be arbitrarily selected from materials that are not easily deformed when heated in a microwave oven. In one example, the material comprising tray 10 is a mixed resin containing polypropylene and talc. Tray 10 includes bottom wall 11 , side walls 12 , opening 13 and flange 14 . The bottom wall 11 and the side walls 12 form a storage space 10A for storing the content 100. As shown in FIG. The housing space 10A and the opening 13 are closed by a lid 20. As shown in FIG. Flange 14 is provided so as to surround the entire periphery of opening 13 .

The flange 14 includes a general tray portion 15 provided along the outer shape of the tray 10 and a tray portion 16 to be steamed that protrudes inside the tray 10 from the general tray portion 15 . The number of tray portions 16 to be steamed provided in the tray 10 is one or more. In the example shown in FIG. 1 and the like, the number of tray portions 16 to be steamed provided in the tray 10 is one. The shape of the tray portion 16 to be steamed can be arbitrarily selected from shapes such that the internal pressure of the accommodation space 10A concentrates when the internal pressure of the accommodation space 10A rises. In the example shown in FIG. 1 and the like, the ventilating tray portion 16 is formed such that the inner edge 16A protrudes toward the inner side of the tray 10 with respect to the inner edge 15A of the general tray portion 15, so that the inner edge 16A is sharpened. It is a mountain-shaped portion in which a tip 17, which is a portion, is formed. The outer edge 16B of the tray portion 16 to be steamed has a shape similar to the inner edge 16A.

The seal portion 30 is a portion where the top surface 14A of the flange 14 and the sealant layer 21 (see FIG. 3) of the lid 20 are sealed. Dots shown in FIGS. 1, 2, and 4 indicate the seal portion 30. FIG. In the example shown in FIG. 1 and the like, the entire top surface 14A and the sealant layer 21 are sealed. Sealing methods between the top surface 14A and the sealant layer 21 are, for example, heat sealing, impulse sealing, high frequency sealing, and ultrasonic sealing. The seal portion 30 includes a general seal portion 31 that extends along the outer shape of the tray 10 and a vapor passage-scheduled seal portion 32 that protrudes inside the tray 10 beyond the general seal portion 31 . The general seal portion 31 is a portion where the top surface 14A of the general tray portion 15 and the sealant layer 21 of the lid 20 are sealed. The shape of the general seal portion 31 is substantially the same as the shape of the top surface 14A of the general tray portion 15 . Vaporization planned seal portion 32 is a portion where top surface 14A of vaporization plan tray portion 16 and sealant layer 21 of lid 20 are sealed. The shape of the vaporization-planned seal portion 32 is substantially the same as the shape of the top surface 14A of the vaporization-planned tray portion 16 .

The seal strength of the seal portion 30 can be arbitrarily selected. In a preferred example, the sealing strength of the seal portion 30 is determined by the difficulty of peeling when a standard force is applied to the package 1 during the process of transporting the package 1, and the resistance to storage when the package 1 is heated in a microwave oven. It is determined based on the relationship with the easiness of peeling when the internal pressure of the space 10A rises. An example of the maximum seal strength of the seal portion 30 is 25 N/15 mm. When the seal strength of the seal portion 30 is 25 N/15 mm or less, the steam-to-be-vented seal portion 32 is preferably peeled off when the package 1 is heated in a microwave oven and the internal pressure of the accommodation space 10A rises. An example of the minimum value of the seal strength of the seal portion 30 is 5N/15mm. When the seal strength of the seal portion 30 is 5 N/15 mm or more, the seal portion 30 is less likely to peel off even when a standard force acts on the package 1 during the process of transporting the package 1 or the like. An example of a range in which the seal strength of the seal portion 30 can be taken is 5 N/15 mm to 25 N/15 mm. In one example, the seal strength of the seal portion 30 is 12 N/15 mm. The seal strength of the general seal portion 31 and the seal strength of the vapor-prepared seal portion 32 may be the same or different. When the seal strength of the general seal portion 31 and the seal portion 32 to be ventilated are different, the seal strength of the seal portion 32 to be ventilated is preferably lower than the seal strength of the general seal portion 31 .

As shown in FIG. 1, the lid 20 is provided with a grip portion 20A that is gripped when the lid 20 is removed from the tray 10 after heating in the microwave oven. The grip portion 20A protrudes outward from the outer edge of the flange 14. As shown in FIG. As shown in FIG. 3, the lid 20 has a three-layer structure in which a sealant layer 21, a heating layer 22, and a base layer 23 are laminated. The sealant layer 21 is laminated on the innermost side. An example of the material forming the sealant layer 21 is a mixed resin having easy peel properties. The thickness of the sealant layer 21 can be selected arbitrarily. The thickness of the sealant layer 21 is, for example, within the range of 20 μm to 60 μm. In one example, the sealant layer 21 has a thickness of 30 μm. The base material layer 23 is laminated on the outermost side. An example of the material forming the base material layer 23 is polyethylene terephthalate. The thickness of the base material layer 23 can be arbitrarily selected. The thickness of the base material layer 23 is, for example, within the range of 9 μm to 25 μm. In one example, the thickness of the base layer 23 is 12 μm.

The heat-generating layer 22 is laminated between the sealant layer 21 and the base layer 23 . A method for laminating the heat-generating layer 22 and the sealant layer 21 is, for example, dry lamination. The material forming the heat-generating layer 22 is heated by the microwaves of the microwave oven, and when the steam-prepared sealing portion 32 is peeled off, a steam passage (see FIG. 5) is formed between the lid 20 and the top surface 14A. Any material that can deform the lid 20 so that it does not close can be selected. Examples of materials forming the heat generating layer 22 are heat generating ink, carbon black, silver, aluminum, and indium tin oxide. In this embodiment, the material forming the heat generating layer 22 includes heat generating ink. As the heating ink, for example, an ink containing a microwave heating ink composition disclosed in JP-A-2017-159912 can be used. The halftone dot area ratio RA of the heat-generating ink in the heat-generating layer 22 can be arbitrarily selected. In a preferred example, the halftone dot area ratio RA is in the range of 50% to 100%. It was confirmed that when the dot area ratio RA is within the range of 50% to 100%, the lid 20 is greatly deformed and the area of the steam passage 40 is widened. In one example, the dot area ratio RA is 100%. The thickness of the heat generating layer 22 can be arbitrarily selected. The thickness of the heating layer 22 is, for example, within the range of 0.5 μm to 3 μm. In one example, the heat generation layer 22 has a thickness of 1 μm. Note that the layered structure of the lid 20 other than the heat generating layer 22 can be arbitrarily changed.

A region XA indicated by a dashed line in FIG. 2 and the like is a region where the heat generation layer 22 is provided when the tray 10 is viewed from above. As shown in FIG. 2 , the heat generating layer 22 is provided so as to partially overlap the vapor-permeable seal portion 32 in a plan view of the tray 10 . In other words, the heat-generating layer 22 is provided so as not to partially overlap the vapor-passage-prepared seal portion 32 in a plan view of the tray 10 . In a preferred example, the heat-generating layer 22 is provided so as to straddle the vapor-permeable seal portion 32 in a plan view of the tray 10 . Since the heat generating layer 22 is provided over a wide range, the lid 20 is greatly deformed and the area of the steam passage 40 (see FIG. 5) is widened. Therefore, the tray 10 is more difficult to deform. In a preferred example, the heat-generating layer 22 is provided so as to overlap at least the tip 32AX of the inner edge 32A of the seal portion 32 to be vaporized when viewed from the top of the tray 10 . Since the portion of the vapor-passing seal portion 32 that is to be peeled first is deformed, the vapor passage 40 is even less likely to be clogged. Therefore, the tray 10 is more difficult to deform. In a preferred example, the heat-generating layer 22 is provided so as to straddle the vaporizing tray portion 16 in a plan view of the tray 10 . Since the heat generating layer 22 is provided over a wide range, the lid 20 is greatly deformed and the area of the steam passage 40 is widened. Therefore, the tray 10 is more difficult to deform.

A method of using the package 1 will be described with reference to FIGS. 4 and 5. FIG.
Steam is generated from the content 100 by heating the package 1 with a microwave oven. Since the opening 13 of the tray 10 and the accommodation space 10A are closed by the lid 20, the water vapor generated by the contents 100 stays in the accommodation space 10A. As the time during which the package 1 is heated increases, the internal pressure of the accommodation space 10A gradually increases. When the internal pressure of the tray 10 rises, the tip 32AX of the inner edge 32A of the vaporization-scheduled seal portion 32, that is, the tip 17 of the inner edge 16A of the vaporization-scheduled tray portion 16 and the portion in the vicinity thereof in the vaporization-scheduled seal portion 32 Stress concentrates more easily in the seal portion 30 than in other portions. Therefore, the sealing portion 30 is peeled off from the top surface 14A of the tray 10 earlier than other portions.

As shown in FIG. 4, after the leading end 32AX of the inner edge 32A of the seal portion 32 for ventilation is peeled off from the tray 10, this peeled portion triggers the peeling of other portions of the seal portion 32 for vapor passage. do. When the delamination of the vaporization-scheduled seal portion 32 progresses to the outer edge 32B, the vaporization-scheduled seal portion 32 forms a steam passage 40 that is a passage that communicates the inside and the outside of the tray 10 . Therefore, the water vapor in the housing space 10A is discharged to the outside of the tray 10 through the steam passage 40. As shown in FIG. Since the heat generating layer 22 is provided in the region XA of the lid 20 near the vapor passage planned seal portion 32, when the lid 20 is peeled off from the top surface 14A, as shown in FIG. The peeled portion (hereinafter referred to as the “peeled portion 24”) is deformed by heat, and the area of the steam passage 40 is widened. When the content 100 has been heated for a specified time, the package 1 is removed from the microwave oven. The lid 20 is peeled off from the tray 10 and the contents 100 are taken out from the opening 13 by flipping the lid 20 from the portion where the grip portion 20A is formed.

According to the package 1, the following actions and effects are obtained.
When the heat generating layer 22 generates heat, the lid 20 is deformed so as not to block the steam passage 40. Therefore, even if water droplets adhere to the tray 10 and the lid 20, the storage space 10A is discharged through the steam passage 40. and the outside are kept in communication. Therefore, for example, even if the air in the accommodation space 10A is cooled by leaving the package 1 after heating in a microwave oven, the accommodation space 10A is not decompressed, and the tray is less likely to deform. .

(Example)
The inventors of the present application used samples of Examples and Comparative Examples to determine the shape of the tray 10 when the area XA where the heating layer 22 is provided and the air in the accommodation space 10A is cooled after heating by the microwave oven. A study was performed to confirm the relationship. In the following description, for convenience of explanation, the same reference numerals are given to the parts of the sample of the comparative example that are common to those of the sample of the example.

The example sample is Package 1 for the embodiment. The halftone dot area ratio RA of the sample of the example is 100%. In the sample of Comparative Example 1, as indicated by the two-dot chain line in FIG. 2, the area XA where the heat generating layer 22 is provided is provided so as to overlap the entire passage-to-seal portion 32 in plan view of the tray 10. It differs from the sample of the example in one point, and matches the sample of the example in other points. The halftone dot area ratio RA of the sample of Comparative Example 1 is 100%. The sample of Comparative Example 2 is different from the sample of Example in that the heat generating layer 22 is not provided, and is the same as the sample of Example in other respects.

In the test, 50 cc of water was stored in the storage space 10A of the sample of Example and the samples of Comparative Examples 1 and 2, and the sealing portion 30 was formed so that the lid 20 closed the opening 13 and the storage space 10A. Each sample of was heated using a microwave oven. The output of the microwave oven is 600W. The heating time is 2 minutes. After heating, each sample was left in the microwave oven for 1 minute, and then the shape of the tray 10 was visually observed.

In the example sample, the tray 10 was not substantially deformed. It is considered that this is because the peeling portion 24 of the lid 20 is greatly deformed, and the steam passage 40 has a sufficiently large area for air to pass through. The sample of Comparative Example 1 was deformed so that the tray 10 was slightly recessed compared to the sample of Example. This is because, in the sample of Comparative Example 1, the degree of deformation of the peeling portion 24 of the lid 20 is smaller than that of the sample of the example, so that an area large enough for air to pass through is not secured, and the housing space 10A is not provided. This is thought to be because the pressure was slightly reduced. In the sample of Comparative Example 2, the tray 10 was deformed so as to be more recessed than in the sample of Example. This is because, in the sample of Comparative Example 2, the peeled portion 24 of the lid 20 was not substantially deformed, the water droplets adhering to the tray 10 and the peeled portion 24 blocked the steam passage 40, and the pressure in the housing space 10A was greatly reduced. It is thought that this is because

(Modification)
It should be noted that the above-described embodiment is an example of a form that the package of the present invention can take, and is not intended to limit the form. A package according to the invention may take a form different from that illustrated in the embodiment. One example is a form in which part of the configuration of the embodiment is replaced, changed, or omitted, or a form in which a new configuration is added to the embodiment. An example of a modification of the embodiment is shown below.

・The structure of the package 1 can be changed arbitrarily. In the package 1 of the modified example shown in FIG. 6, the steaming-scheduled tray portion 16 is omitted. In the package 1 of this modified example, the general tray portion 15 is provided with a general seal portion 31 and a vaporization-scheduled seal portion 32 . The width LA of the general seal portion 31 of this modified example is narrower than the width LB of the general tray portion 15 . The vapor passage-planned seal portion 32 is formed so that the inner edge 32A protrudes toward the inside of the tray 10 with respect to the inner edge 31A of the general seal portion 31, so that the inner edge 32A is formed with a tip 32AX, which is a sharp portion. Part of the type. In this modification, the heat-generating layer 22 is provided so as to overlap with a part of the vapor-permeable seal portion 32 in plan view of the tray 10 .

1: package 10: tray 10A: accommodation space 14A: top surface 15: general tray part 16: steaming planned tray part 20: lid 21: sealant layer 22: heating layer 30: sealing part 31: general sealing part 32: steaming Scheduled seal part 32AX: Tip 100: Contents

Claims (6)

a tray including a containment space for containing contents;
a lid sealed with the top surface of the tray so that the accommodation space is closed;
A sealing portion, which is a portion where the top surface and the lid are sealed,
The seal portion includes a general seal portion extending along the outer shape of the tray, and a vapor passage-planned seal portion projecting inward of the tray from the general seal portion,
The lid includes a sealant layer sealed with the top surface, and a heating layer laminated on the sealant layer and generating heat by microwaves,
The heat-generating layer is provided so as to overlap with a part of the seal portion to be ventilated in a plan view of the tray, and is formed between the lid and the top surface when the seal portion to be ventilated is peeled off. A package that deforms the lid so as not to clog the steam passage through which the lid passes. 2. The package according to claim 1, wherein the heat-generating layer is provided so as to straddle the vapor-permeable seal portion in a plan view of the tray. The package according to claim 1 or 2, wherein the heat-generating layer is provided so as to overlap at least the inner tip of the vapor-permeable seal portion in a plan view of the tray. The tray includes a general tray portion provided with the general seal portion, and a vaporization-planned tray portion provided with the vaporization-planned seal portion and protruding toward the inner side of the tray from the general tray portion,
4. The package according to any one of claims 1 to 3, wherein the heat generating layer is provided so as to straddle the tray portion to be steamed in a plan view of the tray. The heat generating layer contains heat generating ink,
The package according to any one of claims 1 to 4, wherein the dot area ratio of the heat generating ink is in the range of 50% to 100%. The general seal portion includes a first general seal portion and a second general seal portion that are provided apart from each other via the seal portion to be ventilated,
The vaporization-scheduled seal portion includes a first vaporization-scheduled seal portion connected to the first general seal portion, a second vaporization-scheduled seal portion connected to the second general seal portion, and the vaporization-scheduled seal portion. including a tip portion of the sealing portion to be ventilated including a portion located on the innermost side of the tray;
The first vaporization-scheduled seal portion includes a first vaporization-scheduled seal portion base connected to the first general seal portion, and a first vaporization-scheduled seal portion leading end portion connected to the second vaporization-scheduled seal portion, configured to extend toward the inner side of the tray with respect to the first general seal portion;
The second vaporization-scheduled seal portion includes a second vaporization-scheduled seal portion base connected to the second general seal portion, and a second vaporization-scheduled seal portion leading end portion connected to the first vaporization-scheduled seal portion, configured to extend toward the inner side of the tray with respect to the second general seal portion;
The tip of the seal to be ventilated includes the tip of the first seal to be ventilated and the tip of the second seal to be ventilated,
The heat-generating layer is provided so as to overlap the front end portion of the seal portion to be ventilated and not overlap the base portion of the first seal portion to be ventilated and the base portion of the second seal portion to be ventilated in a plan view of the tray.
Package according to any one of claims 1-5.