JP7063715B2 - The container body and its manufacturing method, the tool for manufacturing the container body, and the container - Google Patents

Description

The present invention has a container body having a container for accommodating the contents and a flange portion extending outward from the upper end edge of the container, a method for manufacturing the container body, a tool for manufacturing the container body, and a tool for manufacturing the container body. , The present invention relates to a container in which a lid is heat-bonded to the container body.

Conventionally, cooked or semi-cooked food is stored in a container in which a lid is heat-bonded to the flange of the container body by an annular heat seal, and when the food is eaten, it is cooked by a microwave oven. Packaged foods are on the market.
In such a container, when cooked in a microwave oven, the internal pressure of the container increases due to the thermal expansion of steam generated from food and the internal air, causing the container to burst or deform, or to be contained in the container due to the burst. There was a risk of food scattering.
Therefore, as one of the methods to avoid such container bursting and deformation, before cooking in a microwave oven, a hole is made in advance with a sharp object in the container, and the end of the container is opened with scissors or a kitchen knife. As soon as it is cut off, a method of releasing the internal pressure of the sealed container can be considered.
However, the above method requires a considerable amount of time and effort, and there is a problem that the steam generated by the start of cooking is immediately released to the outside of the container, the effect of heating and steaming by the steam is reduced, and the taste is deteriorated.

Therefore, as a method for solving the above-mentioned problems, the heat-sealed portion of the container is devised so as to have easy peeling property, and the shape of the heat-sealed portion is devised so that the food may be cooked in a microwave oven. Due to the increase in internal pressure due to the expansion of steam generated from the container and the air in the sealed container, a part of the heat-sealed part that heat-bonds the flange part and the lid is peeled off, and the part where the peeling occurs is steamed. As a passage, a method of releasing the internal pressure of the container has been proposed (see, for example, Patent Document 1).
However, in a container as described in Patent Document 1, when the volume-expanded air in the container or steam generated from food returns to the normal state after cooking, that is, the temperature of the heated container reaches room temperature. When lowering, part or all of the steam passage opened during cooking may be blocked and the inside of the container may be decompressed, which may deform the container, resulting in poor appearance of the container and heating. It may be difficult to remove cooked food.

As a plan to prevent the above-mentioned steam passage from being blocked, as disclosed in Patent Document 2, by forming one or more convex portions or the like on the upper surface of the flange portion, a lid is formed on the flange portion. It is also possible to prevent them from coming into close contact with each other.
However, in the container of Patent Document 2, since it is necessary to form one or a plurality of convex portions on the upper surface of the flange portion, not only the manufacturing cost of the container is increased, but also because of the formation of the convex portions. In addition, there is a problem that the radial width of the flange portion must be designed to be large, and the formation of the convex portion may affect the thermal adhesion of the lid to the flange portion.

In order to solve such a problem, for example, in Patent Document 3, a first container layer and a second container layer are laminated as a container for forming a steam passage by causing peeling of a part of a heat-sealed portion during cooking. It has a flange portion of a multi-layer structure including a container layer, the cross sections of the first container layer and the second container layer are exposed when viewed from the accommodating portion side of the flange portion, and the heat seal portion is the cross section. Those having a structure formed so as to be in contact with the inner peripheral edge are disclosed.
In a container having such a structure, a steam passage for discharging steam during cooking of the container is formed between the first container layer and the second container layer. Then, an arch-shaped deformed portion in which the first container layer or the second container layer is deformed in an arch shape is formed by the pressure and heat of the steam passing through the steam passage, so that the steam and the outside air flow smoothly inside and outside the container. be able to.

However, the container disclosed in Patent Document 3 may require a complicated process for forming the cross-sectional portion of the first container layer and the second container layer exposed on the accommodating portion side. That is, the cross-sectional portion of the first container layer and the second container layer is formed by cutting out the second container layer and the first container layer in the region including the inner peripheral edge of the flange portion, or on the base material layer of the flange portion. It is formed by pasting the sheet material to be the two container layer and the first container layer in this order. However, in the method of cutting off the second container layer and the first container layer, a step of removing chips is required because chips are generated, and in the method of pasting the sheet material to be the second container layer and the first container layer. The manufacturing process becomes complicated because it is necessary to perform precise alignment of the sheet material.

Japanese Unexamined Patent Publication No. 09-22177 Japanese Unexamined Patent Publication No. 2000-62858 Japanese Unexamined Patent Publication No. 2017-171329

The present invention solves the above-mentioned problems, and an object thereof is that it can be easily manufactured, a steam passage is formed at the time of heating, the internal pressure in the container can be released, and it is stable even after heating. It is an object of the present invention to provide a container main body and a method for manufacturing the same, a tool for manufacturing the container main body, and a container capable of smoothly flowing steam and outside air inside and outside the container.

The container body of the present invention is a container body having an accommodating portion for accommodating contents and a flange portion extending outward from the upper end edge of the accommodating portion.
The flange portion has a multi-layer structure including a first container layer on the uppermost surface to which a lid can be heat-bonded, and a second container layer laminated in contact with the lower surface of the first container layer.
The first container layer in at least a part extending from the inner peripheral edge of the flange portion includes a planned sealing portion on the outer peripheral edge side and a non-sealing portion on the inner peripheral edge side lowered from the planned sealing portion via a step. Has a step ,
At the boundary between the planned sealing portion and the non-sealing portion, a cutting portion is formed at least up to the boundary between the first container layer and the second container layer.
The cut portion forms a boundary between the planned seal portion and the non-seal portion in the step portion.
When the planned sealing portion is viewed from the accommodating portion side, at least the boundary between the first container layer and the second container layer is exposed .

The container of the present invention is a container having a container for accommodating the contents, a container body having a flange portion extending outward from the upper end edge of the accommodating portion, and a lid body heat-bonded to the flange portion. There,
The container body is the container body,
The lid is not adhered to the non-sealed portion, but is thermally adhered to the planned seal portion.

The method for manufacturing a container body of the present invention is a method for manufacturing a container body having an accommodating portion for accommodating contents and a flange portion extending outward from the upper end edge of the accommodating portion.
From the laminated sheet material having a multi-layer structure including the first container layer on the uppermost surface to which the lid can be heat-bonded and the second container layer laminated in contact with the lower surface of the first container layer, the accommodating portion and the said portion. Form a flat flange planned portion that extends outward from the upper edge of the accommodating portion.
By pressing at least a part of the planned step area extending from the inner peripheral edge of the planned flange portion from above, the planned seal portion is formed on the outer peripheral edge side of the planned step area, and the planned seal portion is formed in the planned step area. Including a method of forming a non-sealed portion so as to be lowered from a step through a step to obtain the flange portion.
A pressing tool is used to press the planned step area of the planned flange portion from above.
The pressing tool is provided with a cutting blade protruding in the pressing direction at the outer end portion of the pressing member that presses the planned step region and should be located on the outer peripheral edge side.
The first container layer at the boundary between the planned sealing portion and the non-sealing portion is cut by the cutting blade at the same time as being pressed by the pressing member .

The tool for manufacturing the container body of the present invention is a tool used in the above-mentioned method for manufacturing the container body and pressing the planned step region of the planned flange portion from above.
It is characterized by including a pressing member for pressing the planned step region and a cutting blade provided at an outer end portion of the pressing member to be located on the outer peripheral edge side of the planned step region.

According to the container body of the present invention, the first container layer in at least a part extending from the inner peripheral edge of the flange portion is the seal planned portion on the outer peripheral edge side and the inner peripheral edge side lowered from the sealed planned portion via a step. It has a stepped portion composed of a non-sealed portion. Therefore, the lid is not adhered to the non-sealed part, but in a container that is heat-bonded to the planned seal part, or the lid is heat-bonded to the planned seal part, and the non-sealed part has a weaker adhesive force than the planned seal part. In the container heat-bonded in, the internal pressure of the container rises when the container is heated, so that the first container layer and the second container layer are separated from each other, and a steam passage formed between the first container layer and the second container layer. By discharging the steam in the container to the outside, the internal pressure in the container can be released, and the rupture and deformation of the container can be suppressed.
Further, since it can be obtained only by forming a stepped portion on the inner peripheral edge side of the flange portion, chips are not generated in the manufacturing process, and it is not necessary to perform precise alignment of the sheet material, and therefore manufacturing is easy. It can be cheap.

According to the method for manufacturing a container body of the present invention, a simple method of pressing the above-mentioned container body from above at least a part of a planned step region extending from the inner peripheral edge of the planned flange portion without requiring a complicated process. Can be manufactured by.
Further, according to the tool for manufacturing the container body of the present invention, the cutting blade protruding in the pressing direction is provided at the outer end portion of the pressing member that presses the planned step region and should be located on the outer peripheral edge side. By pressing the planned step area, the non-sealed portion can be formed at a level position lower than the level position of the planned sealed portion, and at the same time, the space between the non-sealed portion and the planned sealed portion can be cut, and as a result, the above-mentioned The container body can be easily manufactured.

Explanatory drawing which shows the container which concerns on one Embodiment of this invention as seen from above. Explanatory drawing which is enlarged and shown around the periphery of the steam vent part in FIG. FIG. 2 is a cross-sectional view shown in the direction of the arrow at the position taken along the line AA of FIG. FIG. 3 is an enlarged cross-sectional view showing the periphery of the steam venting portion in FIG. Explanatory drawing which shows the state around the steam vent part at the time of heating. Explanatory drawing which shows roughly the state of each part at the time of heating of a container by looking in the direction of an arrow at the position of line BB of FIG. An explanatory view schematically showing a state in which the internal pressure of the container is further increased from the state of FIG. The cross-sectional view explaining the manufacturing method of the container body of this invention.

Hereinafter, the present invention will be described in detail.
〔container〕
As shown in FIGS. 1 to 4, the container 10 according to the embodiment of the present invention is a lid body that is heat-bonded to the container body 20 and the flange portion 24 of the container body 20 by an annular heat seal portion 40. It is composed of 15.
[Heat seal part]
As shown in FIG. 1, the heat-sealing portion 40 of the container 10 according to the embodiment of the present invention has a deformed sealing portion 41 in which the inner peripheral edge of the heat-sealing portion 40 protrudes inward in the width direction of the flange portion 24. ing.
The width dimension L1 of the deformed seal portion 41 in the circumferential direction of the flange portion 24 (hereinafter, also referred to as “container circumferential direction”) is, for example, 4 mm or more.

[Container body]
The container body 20 of the container 10 according to the embodiment of the present invention has a cup-shaped accommodating portion 28 that is open upward to accommodate the contents, and a flange portion 24 that extends outward from the upper end edge of the accommodating portion 28. The housing portion 28 and the flange portion 24 are integrally formed.
The flange portion 24 has a seal layer 21 which is a first container layer on the uppermost surface to which the lid 15 can be thermally adhered, and an intermediate layer (softening) which is a second container layer laminated in contact with the lower surface of the seal layer 21. It has a multilayer structure containing at least the resin layer) 22, and in the container body 20 of this example, the seal layer 21 and the intermediate layer 22 are provided in contact with the lower surface of the intermediate layer 22. It has a three-layer structure with 23.

The seal layer 21 is formed of an ethylene-based copolymer such as polypropylene, polyethylene, EMA (ethylene-methyl acrylate), EVA (ethylene-vinyl acetate), EMMA (ethylene-methyl methacrylate), a mixture thereof, or the like. From the viewpoint of heat resistance, it is preferable that the main component is a resin having a bicut softening point (JIS K7206 A method) of 100 ° C. or higher, and it is particularly preferable that polypropylene or polyethylene is the main component.
The intermediate layer 22 is formed of an ethylene-based copolymer such as polypropylene, polyethylene, EMA, EVA, or EMMA, a mixture thereof, or the like, but from the viewpoint of steam release property, the polyethylene, ethylene-based copolymer, or these. It is preferably formed from a mixture of.
The base material layer 23 is formed of polypropylene, polyethylene or the like, but from the viewpoint of heat resistance, it is preferably formed of polypropylene or polyethylene having a Vicat softening point (JIS K7206 A method) of 100 ° C. or higher as a main component.
The thickness of the seal layer 21 in the planned seal portion 31 can be, for example, 40 to 200 μm.
Further, the elongation rate (JIS K7161) of the seal layer 21 is preferably 100% or more. When the elongation rate of the seal layer 21 is 100% or more, the arch-shaped deformed portion 21a described later can be satisfactorily formed.

In the container body 20 of the present embodiment, the seal layer 21 extends at least a part including at least a part in the circumferential direction of the inner peripheral edge of the flange portion 24, and the seal layer 21 is the seal scheduled portion 31 on the outer peripheral edge side. It has a stepped portion 30 including a non-sealed portion 32 on the inner peripheral edge side that is lowered from the planned seal portion 31 via a stepped portion. The planned seal portion 31 has an adhesive surface in the region on the step side. The adhesive surface is a flat surface, which allows the lid 15 to be firmly adhered to the container body 20. Further, the adhesive surface is formed in a region including the upper edge of the step in the planned seal portion 31, and in the present embodiment, the entire surface of the planned seal portion 31 is a flat adhesive surface.
The non-seal portion 32 is composed of the entire region from the step to the inner peripheral edge of the flange portion 24, and the level position of the non-seal portion 32 is from the level position of the adhesive surface of the planned seal portion 31 in the entire region. Is also low.

Such a step portion 30 is provided at least at a position where the upper end edge of the step, that is, the edge on the inner peripheral edge side of the planned seal portion 31, is in contact with the deformed seal portion 41 of the heat seal portion 40.
Since the end edge on the inner peripheral edge side of the planned seal portion 31 is provided at a position in contact with the deformed seal portion 41, the peeling between the seal layer 21 and the intermediate layer 22 due to the increase in the internal pressure of the container 10 can be prevented in the deformed seal portion 41. It can be selectively generated, and it is possible to suppress the peeling between the seal layer 21 and the intermediate layer 22 and the peeling of the lid 15 from the flange portion 24 in an unplanned place.

In the container body 20 of this example, the stepped portion 30 is formed in a range including a part of the inner peripheral edge of the flange portion 24 in the circumferential direction, but the forming range of the stepped portion 30 is not limited to the above. For example, the step portion 30 may be formed over the entire circumference of the inner peripheral edge of the flange portion 24 in the circumferential direction. Specifically, the seal layer 21 in the entire range of the flange portion 24 descends from the planned seal portion 31 on the outer peripheral edge side and the planned seal portion 31 via a step, and is continuous with the accommodating portion 28 on the inner peripheral edge side. It may be configured by the seal portion 32.
Since the step portion 30 is formed over the entire circumference of the inner peripheral edge of the flange portion 24 in the circumferential direction, when the lid 15 is heat-bonded to the container body 20, the step portion 30 is formed in the circumferential direction between the container body 20 and the lid 15. There is no need to perform alignment.

The height t of the step portion 30 is, for example, 70 to 250 μm.
When the height t of the step is 70 μm or more, steam can be reliably infiltrated into the vicinity of the step of the step portion 30 when the container 10 is heated. Further, since the height t of the step is 250 μm or less, the flange portion 24 is prevented from being excessively deformed or torn when the step portion 30 is formed, so that the container body 20 has sufficient durability. Secured.
In the present embodiment, the boundary between the planned seal portion 31 and the non-seal portion 32 in the step portion 30 is formed by the cut portion 33 of the seal layer 21, and at least when the planned seal portion 31 is viewed from the accommodating portion 28 side. The boundary between the seal layer 21 and the intermediate layer 22 is exposed. That is, the cut portion 33 cuts both the seal layer 21 and the intermediate layer 22, and the stepped surface includes at least the cut surface of the seal layer 21 and the cut surface of the intermediate layer 22 of the planned seal portion 31. ing.
Since the boundary between the planned seal portion 31 and the non-seal portion 32 is formed by the cut portion 33 of the seal layer 21, the seal layer 21 and the intermediate portion are formed as the internal pressure of the container 10 increases when the container 10 is heated. The layers 22 can be reliably separated from each other, and further, when the planned seal portion 31 is viewed from the accommodating portion 28 side, at least the boundary between the seal layer 21 and the intermediate layer 22 is exposed, so that the container 10 can be separated from each other. It is possible to more reliably cause peeling between the seal layer 21 and the intermediate layer 22 due to an increase in the internal pressure.
Further, it is preferable that the depth d of the cut portion 33 is larger than the height t of the step. Since the depth d of the cut portion 33 is larger than the height t of the step, the boundary between the planned seal portion 31 and the non-seal portion 32 can be reliably exposed, and the steam in the container 10 can be stably exposed to the outside. It becomes possible to discharge to.
The width dimension L2 of the step portion 30 in the container circumferential direction is set longer than the width dimension L1 of the deformed seal portion 41 in the container circumferential direction, and the step portion 30 is set at both ends of the deformed seal portion 41 in the container circumferential direction. Is formed over a range exceeding both outer sides in the circumferential direction of the container. As a result, the arch-shaped deformed portion 21a, which will be described later, can be formed satisfactorily.
By forming the stepped portion 30 so as to extend both ends of the deformed sealing portion 41 in the circumferential direction of the container to both outer sides in the circumferential direction of the container, the degree of peeling between the seal layer 21 and the intermediate layer 22 and the degree of peeling between the seal layer 21 and the seal layer 21 and the like. The degree of deformation of the intermediate layer 22 can be satisfactorily controlled, and the arch-shaped deformed portion 21a described later can be reliably formed.

As shown in FIGS. 1 to 3, the flange portion 24 is formed with a hole-shaped steam venting portion 26 penetrating from the upper surface to the lower surface of the flange portion 24. The steam venting portion 26 functions as a portion for releasing the steam in the container 10 to the outside. As shown in FIG. 2, a part or all of the steam venting portion 26 is set so as to be inside the deformed seal portion 41 from the viewpoint of steam venting property.
Since the steam venting portion 26 is formed in the flange portion 24 so that a part or all of the deformed seal portion 41 is included, the arch-shaped deformed portion 21a described later can be formed in the deformed seal portion 41. Therefore, the degree of peeling between the seal layer 21 and the intermediate layer 22 and the degree of deformation of the seal layer 21 and the intermediate layer 22 can be satisfactorily controlled, and the arch-shaped deformed portion 21a can be reliably formed. Can be done.

In the present embodiment, the steam venting portion 26 is formed in a hole shape, but the specific embodiment of the steam venting portion 26 is not limited to the above. The outer peripheral edge of the flange portion 24 in the seal portion 41 may be formed in a shape close to the step portion 30, and the seal layer 21 and the intermediate portion may be formed up to the outer peripheral edge of the flange portion 24 without providing a special steam venting portion 26. The boundary of the layer 22 may be peeled off to allow vapor to escape.
Further, in the present embodiment, from the viewpoint that the arch-shaped deformed portion 21a can be formed satisfactorily, the upper end edge of the step of the step portion 30, that is, the end edge on the inner peripheral edge side of the planned seal portion 31, to the steam venting portion 26. The distance L3 is set to, for example, 3 mm or more, and the dimension L4 of the deformed seal portion 41 in the radial direction of the flange portion 24 (hereinafter, also referred to as “container radial direction”) is set to 3 mm or more.
When the container 10 is heated, the lid 15 and the seal layer 21 swell up to the steam vent 26. Therefore, if the distance L3 from the inner peripheral edge of the planned seal 31 to the steam vent is 3 mm or more, steam The opening of the passage 27 can be formed sufficiently large.

[Cover]
The lid 15 of the container 10 according to the embodiment of the present invention is not adhered to the non-sealing portion 32 of the stepped portion 30, or is adhered with a weaker adhesive force than the scheduled sealing portion 31, so that the planned sealing portion 31 is adhered. The end edge on the inner peripheral edge side is heat-bonded to the adhesive surface including at least the upper edge on the step side of the planned seal portion 31 so as to be in contact with the deformed seal portion 41 of the heat seal portion 40. Here, the weak adhesive force means an adhesive force in which the unsealed portion 32 and the lid 15 are separated from each other when a pressure of 20 kPa or less is applied to the inside of the container 10. A space is formed between the unsealed portion 32 to which the lid body 15 is not adhered and the lid body 15 as an intrusion path for steam to enter the vicinity of the step portion of the step portion 30 when the container 10 is heated.
The adhesive strength between the lid 15 and the seal layer 21 is the adhesive strength between the other layers (adhesive strength between the seal layer 21 and the intermediate layer 22 and the intermediate layer) from the viewpoint of satisfactorily forming the arch-shaped deformed portion 21a described later. It is set higher than the adhesive strength between the layer 22 and the base material layer 23).
Further, the adhesive strength between the seal layer 21 and the intermediate layer 22 is the adhesive strength between the other layers (adhesive strength between the lid 15 and the seal layer 21) from the viewpoint of satisfactorily forming the arch-shaped deformed portion 21a described later. , The adhesive strength between the intermediate layer 22 and the base material layer 23) is set lower.

The lid 15 is provided with an opening grip portion 16 projecting at a position on the outer peripheral side of the heat seal portion 40 and on the outer peripheral side of the flange portion 24. The opening grip portion 16 is a portion for the user to grip when opening the lid body 15, and may be formed at a position separated from the deformed seal portion 41, sandwiching the center of the container body 20. , The form formed on the opposite side of the deformed seal portion 41 is most preferable.
Since the opening grip portion 16 is formed at such a position, the peripheral portion of the deformed seal portion 41, which tends to be difficult to peel off due to the formation of the arch-shaped deformed portion 21a described later, is formed. Since the lid body 15 can be arranged at the position where it is finally peeled off when the lid body 15 is peeled off from the flange portion 24, it is possible to suppress a decrease in the openability of the lid body 15.

Next, the state of each part when the container 10 of the present embodiment is heated will be described below.
First, when the container 10 is heated by the microwave oven, the contents in the container 10 are heated, and the internal pressure in the container 10 rises.
Then, as the internal pressure in the container 10 increases, as shown in FIGS. 5 and 6, peeling occurs at the boundary between the seal layer 21 and the intermediate layer 22 in the deformed seal portion 41, and the seal layer 21 As the peeling between the intermediate layer 22 progresses, a steam passage 27 is formed between the seal layer 21 and the intermediate layer 22, and the steam in the container 10 is discharged to the outside through the steam passage 27 and the steam vent 26. Will be done.

In the present embodiment, the steam in the container 10 is discharged to the outside through the steam passage 27 formed at the boundary between the seal layer 21 and the intermediate layer 22, so that the steam is sealed by the pressure and heat of the steam passing through the steam passage 27. The layer 21 is deformed in an arch shape, and as shown in FIG. 7, the arch-shaped deformed portion 21a is formed in the seal layer 21.
Specifically, when the internal pressure of the container 10 rises, as shown in FIGS. 2 and 6, the lid 15 and the seal layer 21 located on both outer sides of the deformed seal portion 41 in the circumferential direction of the container are adhered to each other. Steam pressure is applied to the non-existing region α, and the space between the lid 15 and the seal layer 21 expands in the region α.
Next, when the internal pressure of the container 10 further increases, as shown in FIG. 6, in the region where the stepped portion 30 is formed, the separation between the seal layer 21 and the intermediate layer 22 is started, and the internal pressure of the container 10 is increased. As the temperature rises, the peeling between the seal layer 21 and the intermediate layer 22 proceeds toward both outer sides in the circumferential direction of the container and the outer side in the radial direction of the container (the steam venting portion 26 side).
At this time, as shown in FIG. 7, a pressing force (downward force in FIG. 7) due to the swelling of the region α is applied to both outer sides of the steam passage 27 in the circumferential direction of the container, and both outer sides in the circumferential direction of the container. The progress of peeling between the seal layer 21 and the intermediate layer 22 is suppressed, and at the same time, vapor pressure is applied between the seal layer 21 and the intermediate layer 22, and as a result, the seal layer in the circumferential direction of the container is applied. Both outer portions of 21 are bent to form an arch support portion 21b, and an arch-shaped deformed portion 21a having a sufficient height is formed.

Then, in the present embodiment, the steam passage 27 is formed between the seal layer 21 and the intermediate layer 22 by the arch-shaped deformed portion 21a formed in the seal layer 21 even after the steam in the container 10 is discharged. Since the state is maintained, even if the temperature of the container 10 drops after the container 10 is heated, the outside air can be introduced into the container 10 through the steam passage 27, so that the container 10 is deformed under reduced pressure. It can be avoided to occur.

As described above, in the container body 20, the seal layer 21 extending from the inner peripheral edge of the flange portion 24 is lowered from the planned seal portion 31 on the outer peripheral edge side and the planned seal portion 31 via a step. It has a stepped portion 30 composed of a non-sealed portion 32 on the inner peripheral edge side. Therefore, in the container 10 in which the lid 15 is not adhered to the non-sealed portion 32, or is adhered to the lid 15 and the planned seal portion 31 with a weaker adhesive force than the adhesive force, and is thermally adhered to the planned seal portion 31. When the container 10 is heated, the internal pressure of the container 10 rises to separate the seal layer 21 and the intermediate layer 22, and the inside of the container 10 is formed through the steam passage 27 formed between the seal layer 21 and the intermediate layer 22. By discharging the steam from the container 10 to the outside, the internal pressure inside the container 10 can be released, and the container 10 can be suppressed from bursting or deforming.
Further, a steam passage 27 for discharging steam when the container 10 is heated is formed between the seal layer 21 and the intermediate layer 22, so that the pressure and heat of the steam passing through the steam passage 27 causes the seal layer 21 or the intermediate layer 21 or the middle. Since it is possible to form an arch-shaped deformed portion 21a in which at least one of the layers 22 is deformed in an arch shape, the arch-shaped deformed portion is formed even when the temperature of the container 10 drops after heating the container 10. The steam passage 27 can be prevented from being blocked by the 21a, whereby the steam and the outside air can be stably flowed inside and outside the container 10 even after heating. Therefore, the outside air is introduced into the container 10 and the container 10 is introduced. It is possible to prevent the deformation from occurring.
Further, since it can be obtained only by forming the stepped portion 30 on the inner peripheral edge side of the flange portion 24, chips are not generated in the manufacturing process, and it is not necessary to perform precise alignment of the sheet material. It can be easy and inexpensive.

Although the container 10 according to the embodiment of the present invention has been specifically described above, the embodiment of the container 10 is not limited to the above example, and various modifications can be made.
For example, in the above-described embodiment, the container body is formed so that the shape of the flange portion is annular, but the specific shape of the container body is not limited to the above, and for example, the flange portion. The container body may be formed so that the shape is rectangular and annular.
Further, in the above-described embodiment, the contents of the container have been described as being food, but the contents of the container are not limited to food.
Further, in the above-described embodiment, the container body is described as having a three-layer structure consisting of a seal layer, an intermediate layer, and a base material layer, but the specific embodiment of the container body is limited to the above. However, it may be formed with a structure of at least two layers, and for example, the container body may be formed with a two-layer structure including the above-mentioned seal layer and base material layer.

Further, in the above-described embodiment, the seal layer is assumed to be the first container layer and the intermediate layer is the second container layer. However, the first container layer and the second container layer are multi-layers constituting the container body. Any two layers of the structure that are laminated in contact with each other may be used. For example, in the case of the container body having the above-mentioned three-layer structure, the intermediate layer is the first container layer and the base material layer is the second container layer. In the case of the container body having a two-layer structure described above, the seal layer may be the first container layer and the base material layer may be the second container layer.
Further, in the above-described embodiment, the arch-shaped deformed portion is formed on the first container layer, but the arch-shaped deformed portion is formed on at least one of the first container layer and the second container layer. , The container may be configured.

[Manufacturing method of container body]
As shown in FIG. 8, the container body 20 as described above is laminated in contact with the seal layer 21, which is the first container layer on the uppermost surface to which the lid 15 can be thermally adhered, in contact with the lower surface of the seal layer 21. Opened upward from a laminated sheet material having a three-layer structure including an intermediate layer (softened resin layer) 22 which is a second container layer and a base material layer 23 provided in contact with the lower surface of the intermediate layer 22. A molding step of forming a cup-shaped accommodating portion 28 and a flat planned flange portion 35 extending outward from the upper end edge of the accommodating portion 28 to obtain a container body 37, and at least extending from the inner peripheral edge of the planned flange portion 35. It can be manufactured by a method that goes through a pressing step of pressing a part of the planned step area P from above.

In the pressing step, as shown in FIG. 8A, the container body 37 is inserted into the bucket 55 in a state where the flange scheduled portion 35 of the container body 37 is received by the neck, and the flange scheduled portion 35 is inserted. A pressing process is performed in which the planned step area P is pressed by the pressing tool 50.
The pressing tool 50 is provided at the step forming member 51, which is a pressing member for pressing the planned step region P, and the outer end portion of the step forming member 51, which should be located on the outer peripheral edge side of the planned step region P. It has a cutting blade 52 that protrudes in the direction.
Specifically, when the pressing tool 50 forms, for example, the step portion 30 over the entire circumference of the inner peripheral edge of the flange portion 24 in the circumferential direction, the disk-shaped step forming member 51 projecting in the pressing direction and the corresponding step portion 50. The outer peripheral end of the step forming member 51 has an annular cutting blade 52 provided so as to project in the pressing direction, and the whole is substantially disk-shaped.
By using such a pressing tool 50, the cut portion 33 can be reliably formed at the boundary between the planned seal portion 31 and the non-seal portion 32, and as a result, the container 10 provided with the obtained container body 20 can be formed. At the time of heating, the seal layer 21 and the intermediate layer 22 are surely peeled off.

By pressing the planned step region P of the planned flange portion 35 from above with such a pressing tool 50, as shown in FIG. 8B, the step forming member 51 on the outer peripheral edge side of the planned step region P The planned seal portion 31 is formed in the upper scheduled region Q that is not pressed, and the non-sealed portion 32 is formed in the planned step region P so as to descend from the scheduled seal portion 31 through the step. Then, at the same time that the non-seal portion 32 and the step are formed, the seal layer 21 at the boundary between the planned seal portion 31 and the non-seal portion 32 is cut by the cutting blade 52 provided so as to project from the step forming member 51. The cut portion 33 is formed. As a result, the flange portion 24 on which the step portion 30 is formed can be obtained.
The pressing tool 50 may be subjected to the pressing process in a heated state.

According to the method for manufacturing the container body 20 as described above, the container body 20 is manufactured by a simple method of pressing the planned step region P of the planned flange portion 35 from above without requiring a complicated process. be able to.
Further, according to the pressing tool 50, which is a tool for manufacturing the container body 20 of the present invention, it projects in the pressing direction toward the outer end portion of the step forming member 51 that presses the planned step region P, which should be located on the outer peripheral edge side. Since the cutting blade 52 is provided, the non-seal portion 32 is formed at a level position lower than the level position of the planned seal portion 31 by pressing the planned step region P, and at the same time, the non-seal portion 32 and the planned seal portion 32 are formed. The space between the container and the container can be cut from 31, and as a result, the container body 20 can be easily manufactured.
The amount of protrusion of the cutting blade 52, the shape of the cutting edge, the angle, etc. may be appropriately designed according to the material of the seal layer 21, and the seal layer 21 at the boundary between the planned seal portion 31 and the non-seal portion 32 is cut. As long as the cutting portion 33 is formed, the edge of the step forming member 51 may function as a cutting blade without protruding.

10 Container 15 Lid 16 Opening grip 20 Container body 21 Seal layer (first container layer)
21a Arch-shaped deformation portion 21b Arch support portion 22 Intermediate layer (second container layer)
23 Base material layer 24 Flange part 26 Steam vent part 27 Steam passage 28 Storage part 30 Step part 31 Seal scheduled part 32 Non-sealed part 33 Cut part 35 Flange planned part 37 Container body 40 Heat seal part 41 Deformed seal part 50 Pressing tool 51 Step forming member 52 Cutting blade 55 Bucket

Claims (6)

A container body having an accommodating portion for accommodating contents and a flange portion extending outward from the upper end edge of the accommodating portion.
The flange portion has a multi-layer structure including a first container layer on the uppermost surface to which a lid can be heat-bonded, and a second container layer laminated in contact with the lower surface of the first container layer.
The first container layer in at least a part extending from the inner peripheral edge of the flange portion includes a planned sealing portion on the outer peripheral edge side and a non-sealing portion on the inner peripheral edge side lowered from the planned sealing portion via a step. Has a step ,
At the boundary between the planned sealing portion and the non-sealing portion, a cutting portion is formed at least up to the boundary between the first container layer and the second container layer.
The cut portion forms a boundary between the planned seal portion and the non-seal portion in the step portion.
A container body characterized in that at least the boundary between the first container layer and the second container layer is exposed when the planned sealing portion is viewed from the accommodation portion side . The container body according to claim 1, wherein the step portion is provided over the entire circumference of the inner peripheral edge of the flange portion in the circumferential direction. A container having a container for accommodating the contents, a container body having a flange portion extending outward from the upper end edge of the accommodating portion, and a lid body heat-bonded to the flange portion.
The container body is the container body according to claim 1 or 2.
A container in which the lid is not adhered to the non-sealed portion but is thermally adhered to the planned seal portion. A container having a container for accommodating the contents, a container body having a flange portion extending outward from the upper end edge of the accommodating portion, and a lid body heat-bonded to the flange portion.
The container body is the container body according to claim 1 or 2.
The lid is heat-bonded to a part of the non-sealed portion and the planned sealed portion.
A container characterized in that the adhesive force between the lid body and the non-seal portion is weaker than the adhesive force between the lid body and the planned seal portion. A method for manufacturing a container body having an accommodating portion for accommodating contents and a flange portion extending outward from the upper end edge of the accommodating portion.
From the laminated sheet material having a multi-layer structure including the first container layer on the uppermost surface to which the lid can be heat-bonded and the second container layer laminated in contact with the lower surface of the first container layer, the accommodating portion and the said portion. Form a flat flange planned portion that extends outward from the upper edge of the accommodating portion.
By pressing at least a part of the planned step area extending from the inner peripheral edge of the planned flange portion from above, the planned seal portion is formed on the outer peripheral edge side of the planned step area, and the planned seal portion is formed in the planned step area. Including a method of forming a non-sealed portion so as to be lowered from a step through a step to obtain the flange portion.
A pressing tool is used to press the planned step area of the planned flange portion from above.
The pressing tool is provided with a cutting blade protruding in the pressing direction at the outer end portion of the pressing member that presses the planned step region and should be located on the outer peripheral edge side.
A method for manufacturing a container body, characterized in that the first container layer at the boundary between the planned sealing portion and the non-sealing portion is cut by the cutting blade at the same time as pressing by the pressing member . A tool used in the method for manufacturing a container body according to claim 5, which presses the planned step region of the planned flange portion from above.
A tool for manufacturing a container body, comprising: a pressing member for pressing the planned step region and a cutting blade provided at an outer end portion of the pressing member to be located on the outer peripheral edge side of the planned step region.

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