JP6972639B2 - Container with lid and container used for it - Google Patents

Description

The present invention relates to a container with a lid for cooking, which is mainly heated by a microwave oven or the like, and a container used thereof.

Conventionally, a container with a lid including a plastic container for accommodating the contents, a flange portion formed in the container, and a lid joined to the flange portion by a circumferential seal portion is known. The contents contained in the container with a lid are heated by a microwave oven or the like. The contents may be cooked or semi-cooked foods.

When the contents contained in the container sealed by the lid are heated by using a microwave oven, the water contained in the contents evaporates with the heating and the pressure in the container containing part increases. If the pressure in the container housing increases, the lid or container may burst and the contents may scatter and contaminate the inside of the microwave oven. In consideration of such a problem, it has been proposed to provide a steam venting mechanism that allows the steam inside the container to escape to the outside by communicating the storage part with the outside when the pressure of the storage part of the container with a lid exceeds a predetermined value. There is.

For example, in Patent Document 1 below, the seal portion is rotated around the outer peripheral portion of the flange portion and the entire circumference of the bulging portion, the seal portion is peeled off by the bulging portion, and the expanded air inside the container is removed for cooking. A container with a lid is disclosed. In this container, the bulging portion is formed not only on the flange portion but also on the side portion of the container.

Jikkenhei 03-87688 No.

When the internal pressure of the container with a lid rises, the lid expands from a flat surface to an arc. As a result, the pair of flange portions facing each other are easily pulled and warped upward. The degree of warpage of the flange portion depends on the heating conditions of the microwave oven and the thickness and material of the flange.

If the flange portion is warped upward when the steam is released later, the lid of the seal portion and the flange portion inevitably tend to come into close contact with each other. For this reason, even if the above-mentioned steam venting mechanism is provided in a part of the seal portion, there arises a problem that the lid and the flange portion are in close contact with each other and it becomes difficult for steam to escape.

In this regard, in the above-mentioned Patent Document 1, since the bulging portion is formed not only on the flange portion but also on the side portion of the container, the presence of the bulging portion imparts rigidity to the side portion in the first place. The problem of warpage of the flange portion is unlikely to occur. However, from the viewpoint of accommodating the contents, an extra convex portion such as a bulging portion is formed on the side surface of the container from the viewpoint of securing the accommodating capacity, appearance, and ease of taking out the contents. It is preferably a continuous flat surface or curved surface. However, in this case, as described above, there arises a problem that the flange portion is warped and it becomes difficult for steam to escape.

An object of the present invention is to provide a container with a lid that can effectively solve such a problem.

The present invention is a container with a lid provided with a container in which an opening is formed and a lid that covers the opening and is joined to the container, wherein the container has a bottom and a side erected from the bottom. A portion and a flange portion including a first plane, which are connected to the upper part of the side portion, are provided, and a circumferential sealing portion is formed between the lid and the first plane of the flange portion. The sealing portion includes a main sealing portion and a protruding sealing portion protruding inward with respect to the main sealing portion, and the flange portion has the protruding sealing portion at least at a position corresponding to the protruding sealing portion. A container with a lid, wherein a contact suppressing mechanism for suppressing the contact between the flange portion and the lid is formed on the outside of the container.

In the side portion of the container with a lid according to the present invention, the first portion corresponding to the protruding seal portion constitutes the same plane or curved surface continuous with the second portion located on both sides of the first portion. May be good.

In the container with a lid according to the present invention, a rib portion extending from the bottom portion toward the flange portion may be formed on the side portion of the container.

In the container with a lid according to the present invention, even if the rib portion is formed on each of the first portion corresponding to the protruding seal portion on the side portion and the second portion located on both sides of the first portion. good.

In the container with a lid according to the present invention, the rib portion may be configured to be convex outward.

In the container with a lid according to the present invention, the rib portion may extend so as to reach the inner edge of the flange portion.

In the flange portion of the container with a lid according to the present invention, the inner edge of the first flange portion corresponding to the protruding seal portion constitutes a straight line or a curved line continuous with the second flange portions located on both sides of the first flange portion. You may be doing it.

In the container with a lid according to the present invention, the adhesion suppressing mechanism may include a notch formed in the flange portion on the outside of the protruding seal portion.

In the container with a lid according to the present invention, the outer edge of the protruding seal portion may be in contact with the notch portion of the flange portion.

In the container with a lid according to the present invention, the adhesion suppressing mechanism includes a step portion formed on the flange portion on the outside of the protruding seal portion, and the step portion is connected to the first plane and is connected to the first plane. It may include at least a flange wall portion extending downward from.

In the container with a lid according to the present invention, the outer edge of the protruding seal portion may be in contact with the stepped portion of the flange portion.

In the container with a lid according to the present invention, a portion of a straight line extending so as to pass between the tip point of the protruding seal portion and the center point of the opening and connecting two intersections with the outer edge of the seal portion is a first line segment. The portion of the straight line orthogonal to the first line segment and extending so as to pass through the center point of the opening and connecting the two intersections with the outer edge of the seal portion is preferably referred to as the second line segment. , The first line segment is shorter than the second line segment.

In the container with a lid according to the present invention, the protruding seal portions may be formed at two or more positions facing each other of the container.

In the container with a lid according to the present invention, preferably, the main sealing portion and the protruding sealing portion of the sealing portion are connected to each other at the first shortest distance in a plan view from the adhesion suppressing mechanism to the opening. It is shorter than the second shortest distance in a plan view from the inner edge of the connection portion to the opening portion.

The present invention includes a container having an opening, a bottom portion, a side portion erected from the bottom portion, and a first plane connected to the upper portion of the side portion and to which a lid is joined. The flange portion is provided with a flange portion that defines the opening portion, and the adhesion suppressing mechanism for suppressing the adhesion between the flange portion and the lid is formed on the flange portion, and the adhesion suppressing mechanism is provided on the outer edge of the flange portion. It is a container including a formed notch or a stepped portion including a flange wall portion connected to the first plane and extending downward from the first plane and a second plane connected to the flange portion.

In the side portion of the container according to the present invention, the first portion corresponding to the adhesion suppressing mechanism may form the same plane or curved surface continuous with the second portions located on both sides of the first portion. ..

A rib portion extending from the bottom portion toward the flange portion may be formed on the side portion of the container according to the present invention.

In the container according to the present invention, the adhesion suppressing mechanism is preferably located on a straight line extending so as to connect the inner edge of the flange portion and the center point of the opening at the shortest distance.

The container with a lid of the present invention can allow steam to pass through the protruding seal portion even when the flange portion of the container is warped during microwave heating.

It is a top view of the container with a lid of 1st Embodiment of this invention. It is a perspective view of the container with a lid of 1st Embodiment of this invention. It is a top view of the container which constitutes the container with a lid of FIG. It is sectional drawing which cut the container with a lid shown in FIG. 1 along the IVA-IVA line. It is sectional drawing which cut the container with a lid shown in FIG. 1 along the IVB-IVB line. It is a top view of the container with a lid of the 1st modification of 1st Embodiment. It is a perspective view of the container with a lid of the 1st modification of 1st Embodiment. FIG. 5 is a cross-sectional view of the container with a lid shown in FIG. 5 cut along the line VIA-VIIA. FIG. 5 is a cross-sectional view of the container with a lid shown in FIG. 5 cut along the line VIIB-VIIB. It is a top view of the container with a lid of the 2nd modification of 1st Embodiment. It is a top view of the container which constitutes the container with a lid of FIG. It is a top view of the container with a lid of the 3rd modification of 1st Embodiment. It is an exploded view of the member which constitutes the container with a lid in 2nd Embodiment of this invention. It is a top view which shows the container with a lid in 2nd Embodiment of this invention. It is sectional drawing which cut the container with a lid shown in FIG. 12 along the line XIII-XIII. It is sectional drawing which shows one modification of the container with a lid. It is sectional drawing which shows an example of the layer structure of a lid. FIG. 3 is an enlarged plan view showing the protruding seal portion shown in FIG. 12. It is sectional drawing which cut the container with a lid shown in FIG. 12 along the line XVII-XVII. It is a top view which shows the notch part of the flange part enlarged. It is a top view which shows the process of manufacturing the container which formed the notch part in a part of the outer edge of the flange part. It is a top view which shows the process of heat-sealing the lid to the flange part of a container. It is a top view which shows one modification of the notch part of a flange part. It is a top view which shows one modification of the container with a lid. It is a top view which shows one modification of the container with a lid. It is sectional drawing which shows one modification of the adhesion suppressing mechanism formed in the flange part of a container. It is a top view which shows one modification of the protrusion seal part. It is a top view which shows one modification of the protrusion seal part. It is an exploded view of the member constituting the container with a lid which concerns on one modification. It is a top view which shows the container with a lid of FIG. 27. It is sectional drawing which cut the container with a lid shown in FIG. 28 along the XXIX-XXIX line. It is sectional drawing which cut the container with a lid shown in FIG. 29 along the line XXX-XXX. FIG. 8 is an enlarged plan view showing the protruding seal portion shown in FIG. 28. It is a top view which shows the container with a lid which concerns on one modification. It is a top view which shows the container with a lid which concerns on one modification.

Hereinafter, each embodiment of the present invention will be described in detail, but the present invention is not limited to the following embodiments, and the present invention shall be carried out with appropriate modifications within the scope of the object of the present invention. Can be done.

1st Embodiment <Container with a lid>
Hereinafter, the container with a lid 10 of the first embodiment will be described with reference to FIGS. 1 to 4B. FIG. 1 is a plan view of the container with a lid of the first embodiment, and FIG. 2 is a perspective view of the container with a lid of the first embodiment. FIG. 3 is a plan view of the container 20 constituting the container with a lid 10. 4A is a cross-sectional view of the container with a lid 10 shown in FIG. 1 cut along the line IVA-IVA, and FIG. 4B is a cross-sectional view of the container 10 with a lid shown in FIG. 1 cut along the line IVB-IVB. It is a figure. In addition, in order to avoid complication, FIG. 1 also shows a configuration located under the lid 30 with a solid line. Further, in the drawings attached to the present specification, the scale, the aspect ratio, etc. may be appropriately changed from those of the actual product and shown exaggerated for the convenience of illustration and comprehension. In addition, the terms such as "parallel", "orthogonal", and "identical" and the values of length and angle, which specify the shape and geometric conditions and their degrees, which are used in the present specification, are strictly referred to. It is interpreted to include the range where similar functions can be expected without being bound by meaning.

(Container with lid)
The container 10 with a lid includes a container 20 and a lid 30 that covers the opening 29 of the container 20, and a circumferential sealing portion 40 is formed between the container 20 and the lid 30. In FIG. 1, reference numeral 40x represents an edge portion (hereinafter, also referred to as an inner edge) located on the opening 29 side of the sealing portion 40, and reference numeral 40y represents an outer edge located on the opposite side of the inner edge 40x. By joining the container 20 and the lid 30 via the sealing portion 40, the contents (not shown) such as food are sealed. In the present invention, the "circumferential shape" refers to a seal portion formed over one circumference, and is not limited to a circumferential shape, but may be a polygonal shape, and the circumferential shape and the polygonal shape may be used. It may be a combination.

The contents contained in the container with a lid 10 are not particularly limited, and examples of the contents include retort foods, frozen foods, and refrigerated foods. Examples of foods include curry, porridge, fried noodles, side dishes, and fish. In these contents, moisture evaporates with heating and the pressure in the accommodating portion of the container with a lid increases. Therefore, the steam venting function for releasing the steam in the container with a lid 10 to the outside is provided with a lid for cooking. Required for container 10.

[container]
The container 20 can be molded by, for example, an injection molding method or a sheet molding method. The material constituting the container 20 is not particularly limited, and plastics such as polypropylene, polystyrene, and polyethylene terephthalate can be used. When the container 20 is manufactured by injection molding, the height H1 of the container 20 (see FIGS. 4A and 4B) is set to the length L2 of the flange portion 22 of the container 20 in the lateral direction (see FIG. 1) in order to ensure moldability. ) It is preferable to make the following.

In the present invention, refrigerated (chilled) or frozen foods are also assumed as the contents to be contained in the container with a lid 10. In this case, for example, if the container is made of conventional homopolypropylene, the impact resistance at low temperature is lowered. Therefore, by using block polypropylene or the like containing a rubber component or an ethylene component, the impact resistance at a low temperature is improved. However, the addition of the rubber component or the ethylene component lowers the rigidity of the container including the flange portion, so that the problem of warpage of the flange portion is likely to occur. That is, the container with a lid of the present invention is preferably used when block polypropylene containing a rubber component or an ethylene component is used as the container. Alternatively, even a container using homopolyethylene is preferably used when the thickness is thin.

Next, the configuration of the container 20 will be described with reference to FIGS. 1 to 4B. The container 20 has a body portion 21 including a bottom portion 211 and a side portion 213, and a flat flange portion 22 connected to the upper edge of the side portion 213 of the body portion 21. The inner edge 22x of the flange portion 22 defines the opening 29 of the accommodating portion of the container 20. The side portion 213 is erected from the bottom portion 211 so as to extend around the outer edge of the bottom portion 211.

The lid 30 is joined to the upper surface of the flange portion 22 of the container 20 via the sealing portion 40. 1 and 2 show an example in which the flange portion 22 is connected to the upper edge of the side portion 213 and extends horizontally toward the outside. In addition, in this specification, terms such as "planar", "upper", "lower", "upper edge", "horizontal", and "horizontal direction" are used so that the bottom 211 of the container 20 is located below. It represents the position and direction of the container 20, the lid 30, and their components based on the state in which the 20 is placed.

The bottom portion 211 may be formed with one or more convex portions or concave portions as in the raised portion 212 shown in FIGS. 4A and 4B. This makes it possible to prevent the lidded container 10 from being deformed when the pressure inside the lidded container 10 increases when the contents are cooked using a microwave oven.

In the present embodiment, in the side portion 213, the first portion 214 corresponding to the notch portion 23 described later constitutes the same plane or the same curved surface continuous with the second portion 215 located on both sides of the first portion 214. .. In the present embodiment, as shown in FIG. 1, the portion sandwiched between the straight line la corresponding to one end of the notch 23 and the straight line lb corresponding to the other end of the notch 23 is the first portion 214 of the side portion 213. The second portion 215 of the side portion 213 is located on both sides of the first portion 214, and the first portion 214 and the second portion 215 of the side portion 213 form one continuous plane. In other words, the inner edge 22x of the flange portion 22 corresponding to the first portion 214 and the second portion 215 of the side portion 213 forms a straight line (see FIG. 1). When the first portion 214 of the side portion 213 and the second portion 215 of the side portion 213 form the same curved surface, the first portion 214 and the second portion 215 form one continuous curved surface.

[Flange part]
The contour of the flange portion 22 is formed by an outer edge 22y, and has a rectangular contour including a pair of long sides 22a and a pair of short sides 22b. As shown in FIG. 1, in the present embodiment, the rectangular concept also includes a corner portion 22c provided between the long side 22a and the short side 22b. That is, in the present embodiment, the contour of the flange portion 22 passes through the long side 22a, the corner portion 22c, the short side 22b, the corner portion 22c, the long side 22a, the corner portion 22c, the short side 22b, and the corner portion 22c. It is formed continuously in a shape. In the following description, the portion of the flange portion 22 extending along the long side 22a is also referred to as the long side portion 22A. Further, a portion of the flange portion 22 extending along the short side 22b is also referred to as a short side portion 22B. Further, the portion of the flange portion 22 corresponding to the corner portion 22c is also referred to as a corner portion 22C.

In FIG. 1, reference numeral L1 represents the length of the flange portion 22 in the longitudinal direction (distance between one short side 22b and the other short side 22b), and reference numeral L2 is the length of the flange portion in the lateral direction. (The distance between one long side 22a and the other long side 22a), and the length L1 is larger than the length L2. In FIGS. 1 and 2, the corner portion 22c is located between the long side 22a and the short side 22b, and is formed in an outwardly convex arc shape. The corner portion 22c is obtained, for example, by chamfering the corner portion of the flange portion having a rectangular contour.

In FIG. 1, reference numeral M1 refers to the outer edge 40y of the circumferential seal portion 40 in the straight line IVA extending so as to pass through the tip point P2 of the tip portion of the protruding seal portion 44 and the center point 29c of the opening portion 29, which will be described later. Represents a portion connecting the two intersections of the above (hereinafter referred to as a first line segment). In the example shown in FIG. 1, one end of the first line segment M1 is located at the outer edge 40y of the protruding seal portion 44 on one long side portion 22A, and the other end of the first line segment M1 is the other long side portion. It is located on the outer edge 40y of the main seal portion 42 on 22A. Further, in FIG. 1, the reference numeral M2 is a straight line orthogonal to the first line segment M1 and extending so as to pass through the center point 29c of the opening 29, and has two intersections with the outer edge 40y of the circumferential seal portion 40. Represents a connecting portion (hereinafter referred to as a second line segment). In the example shown in FIG. 1, one end of the second line segment M2 is located at the outer edge 40y of the main seal portion 42 on one short side portion 22B, and the other end of the second line segment M2 is the other short side portion. It is located on the outer edge 40y of the main seal portion 42 on 22B. The first line segment M1 is shorter than the second line segment M2. For example, the length of the first line segment M1 is 0.85 or less, more preferably 0.75 or less, and further preferably 0.70 or less, which is the length of the second line segment M2.

How to swell the lid 30 when heating the contents using a microwave oven by making the length L1 larger than the length L2 or making the first line segment M1 shorter than the second line segment M2. The protruding seal portion 44 described later on the long side portion 22A can be peeled off from the lid 30 or the flange portion 22 before the other portions of the seal portion 40, even if there is a variation in the portion.

In the present invention, the contour shape of the flange portion 22 is not particularly limited, and may be a circular shape, an elliptical shape, a polygonal shape, or a combination thereof as a whole. Further, the corner portion 22c is not limited to the curved portion, and may be composed of the corner portion. Further, the thickness of the flange portion 22 is set within the range of, for example, 0.5 mm or more and 2.0 mm or less.

The flange portion 22 is a flange-shaped portion that extends horizontally from the upper edge of the side portion 213, but in the present embodiment, as shown in FIGS. 4A and 4B, the flange portion 22 is composed of a first plane 221. The first plane 221 is a flange-shaped portion that extends horizontally from the upper edge of the side portion 213, that is, the inner edge 22x of the flange portion, and is a plane constituting the seal portion 40.

[Notch]
A notch 23 formed so as to project inside the container 20 is formed in the central portion of one long side portion 22A of the flange portion 22 in the long side direction. The notch 23 is a portion in the region where the lid 30 exists, and a flat portion extending in the horizontal direction does not exist, and is shown as a portion in which the first plane 221 does not exist in FIGS. 1, 3 and 4A. There is. The notch 23 is formed so as to cut out the outer edge of one of the long side portions 22A and to have a tapered shape toward the tip point (vertex) P1 on the opening 29 side. An example of making a triangle shape is shown. As will be described later, the notch 23 functions to prevent the upper surface of the flange portion 22 and the lower surface of the lid 30 from coming into close contact with each other when the contents are heated. In the following description, a component such as the notch 23 that suppresses the adhesion between the flange portion 22 and the lid 30 is also referred to as an adhesion suppressing mechanism 19.

In FIG. 3, the straight line with the reference numeral L3 is a straight line extending so as to connect the inner edge 22x of the flange portion 22 and the center point 29c of the opening portion 29 at the shortest distance. Preferably, the adhesion suppressing mechanism 19 is located on this straight line L3 as shown in FIG.
Further, in FIG. 3, reference numeral M5 represents a portion of the straight line L3 that overlaps the opening 29 (hereinafter, referred to as a fifth line segment). Further, in FIG. 3, the reference numeral M6 is a portion of a straight line that is orthogonal to the fifth line segment M5 and extends so as to pass through the center point 29c of the opening 29 and overlaps with the opening 29 (hereinafter referred to as the sixth line segment). Represents. The fifth line segment M5 is shorter than the sixth line segment M6. For example, the length of the fifth line segment M5 is 0.85 or less, more preferably 0.75 or less, and further preferably 0.70 or less, which is the length of the sixth line segment M6.

[Seal part]
As shown in FIG. 1, between the lid 30 and the flange portion 22 of the container 20, a circumferential sealing portion 40 for joining the lid 30 and the flange portion 22 is continuously formed over one circumference. The circumferential sealing portion 40 may be formed by at least partially melting at least one of the container 20 or the lid 30 by a sealing means such as heat, ultrasonic waves, or high frequency. Further, the sealing portion 40 may be formed of a component separate from the container 20 and the lid 30 such as an adhesive. By forming the sealing portion 40 between the lid 30 and the flange portion 22, the opening 29 of the container 20 can be sealed without a gap.

As shown in FIG. 1, the circumferential seal portion 40 includes a main seal portion 42 extending along the long side 22a, the short side 22b, and the corner portion 22c, which are the outer edges of the flange portion 22, and the length of the flange portion 22. It is arranged in a substantially central portion on the side portion 22A, and is composed of a protruding seal portion 44 protruding inward from the main seal portion 42.

The protruding seal portion 44 is formed on a first flat surface 221 located inside the notch portion 23, and protrudes inward of the container 20 along the notch portion 23 to have a tip point (top) P2 in a substantially V shape. It is provided. As will be described later, the protruding seal portion 44 functions to be peeled off before the main seal portion 42 when the contents are heated, and to discharge the steam inside the container with a lid 10 to the outside. In the following description, a component for preferentially discharging the steam inside the container with a lid 10 to the outside, such as the protruding seal portion 44, is also referred to as a steam bleeding mechanism 18.

In the present invention, the flange portion constituting the circumferential seal portion 40 is not limited to a flat surface, but a convex portion is formed on the flange portion, and the circumferential seal portion 40 is formed via the convex portion. May be good.

[lid]
The material constituting the lid 30 to be joined to the container 20 is selected so that the lower surface of the lid 30 can be joined to at least the upper surface of the flange portion 22 of the container 20. For example, the lid 30 includes a base material layer and a sealant layer constituting the lower surface of the lid 30. The thickness of the lid 30 is not particularly limited, but can be, for example, within the range of 20 μm or more and 100 μm or less.

As the material constituting the base material layer, a polyester resin such as polyethylene terephthalate, a polyamide resin such as nylon, polypropylene and the like can be used. Further, as a material constituting the sealant layer, polypropylene, a mixed resin of polypropylene and polyethylene, or the like can be used. When both the base material layer and the sealant layer contain polypropylene, biaxially stretched polypropylene is used for the base material layer, and unstretched polypropylene is used for the sealant layer.

<Action of container with lid>
When the contents of the container with a lid 10 containing the contents are heated using a microwave oven, the temperature of the contents rises, and along with this, the water contained in the contents evaporates and the inside of the container with a lid 10 is heated. Pressure increases. When the pressure inside the container with a lid 10 becomes higher with heating, the lid 30 swells and stress is applied to the circumferential seal portion 40. Here, in the container with a lid 10, the tip point P2 of the protruding seal portion 44 is formed on the long side portion 22A of the flange portion 22. Therefore, the stress is concentrated on the tip point P2 of the protruding seal portion 44.

At this time, the inner edge 22x of the flange portion 22 at the position corresponding to the protruding seal portion 44 is a straight line, and the first portion 214 of the side portion 213 and the second portion 215 located on both sides of the first portion 214 are flush with each other. Alternatively, they form the same curved surface, and specifically, in this embodiment, the first portion 214 and the second portion 215 are configured on the same plane.

As a result, in the container with a lid in which the notch 23 is not formed, stress is concentrated on the tip point P2 of the protruding seal portion 44, and when the flange portion of the protruding seal portion 44 bends upward, the first portion is below the lid 30. Since the one flat surface 127 is present, the lid 30 and the flange portion 22 are in close contact with each other, making it difficult for the steam to escape, and even if the tip point P2 is preferentially peeled off, the steam cannot escape.

However, in the container with a lid of the present embodiment, since the notch portion 23 is formed below the lid 30, even if the flange portion 22 including the protruding seal portion 44 is warped, it is possible to facilitate the passage of steam. ..

[First modification of a container with a lid]
The first modification of the first embodiment will be described with reference to the container 10 with a lid of FIGS. 5 to 7B. In the following description of the other embodiments, the same reference numerals as those in the above-described embodiment will be replaced with reference to the description in the above-described embodiment, and the description thereof will be omitted. The same applies to the second and subsequent modifications. In addition, in order to avoid complication, FIG. 5 also shows a configuration located under the lid 30 with a solid line.

The container with a lid 10 of FIGS. 5 to 7B is different from the above-described embodiment in that a stepped portion 24 is formed. In this modification, the step portion 24 functions as an adhesion suppressing mechanism 19 that prevents the upper surface of the flange portion 22 and the lower surface of the lid 30 from coming into close contact with each other when the contents are heated.

In the first modification, the flange portion 22 includes at least a first plane 221 and a flange wall portion 241 connected to the outer edge of the first plane 221 and extending downward. The flange portion 22 may further include a second plane 242 that is connected to the lower portion of the flange wall portion 241 and extends in the horizontal direction. In the example shown in FIG. 7A, the stepped portion 24 is formed by the flange wall portion 241 and the second flat surface portion 242. In this case, by providing a gap between the lower edge of the lid 30 and the upper edge of the second flat surface 242, it is easy for steam to pass even when the flange portion of the protruding seal portion 44 is warped upward. be able to. Here, in FIG. 7A, the distance between the lower edge of the lid 30 and the upper edge of the second plane 242 is indicated by the reference numeral h1, but h1 is preferably 1 mm or more, and 2 mm or more and 5 mm or less. Is more preferable. The shape of the second flat surface 242 is not limited to the flat shape as long as the lower edge of the lid 30 and the second flat surface 242 do not come into close contact with each other.

[Second modification of the container with a lid]
A second modification of the first embodiment will be described with reference to FIGS. 8 and 9. FIG. 8 is a plan view of the container with a lid 10 according to the present modification, and FIG. 9 is a plan view of the container 20 constituting the container with a lid 10 of FIG. In addition, in order to avoid complication, FIG. 8 also shows a configuration located under the lid 30 with a solid line. The container with a lid 10 of FIG. 8 is different from the first embodiment in that the notch 23 is formed at two positions facing each other on the pair of long sides 22a.

As shown in FIG. 8, the protruding seal portions 44 are also formed at two locations on the first plane 221 located inside the notch portion 23. In FIG. 8, reference numeral M3 is a portion of the straight line L4 extending so as to pass through the tip point P2 of the two protruding seal portions 44, connecting two intersections with the outer edge 40y of the circumferential seal portion 40 (hereinafter, third). (Called a line segment). In the example shown in FIG. 8, the straight line L4 passes through the center point 29c of the opening 29. Further, in FIG. 8, reference numeral M4 is a straight line orthogonal to the third line segment M3 and extending so as to pass through the center point 29c of the opening 29, and has two intersections with the outer edge 40y of the circumferential seal portion 40. Represents a connecting portion (hereinafter referred to as a fourth line segment). The third line segment M3 is shorter than the fourth line segment M4. For example, the length of the third line segment M3 is 0.85 or less, more preferably 0.75 or less, and further preferably 0.70 or less, which is the length of the fourth line segment M4.

In FIG. 9, the straight line with the reference numeral L5 is a straight line extending so as to connect the inner edge 22x of the flange portion 22 and the center point 29c of the opening portion 29 at the shortest distance. Preferably, both of the two adhesion suppressing mechanisms 19 are located on this straight line L5 as shown in FIG. In the example shown in FIG. 9, the straight line L5 passes through the tip points P1 of the two notches 23.
Further, in FIG. 9, reference numeral M7 represents a portion of the straight line L5 that overlaps the opening 29 (hereinafter, referred to as a seventh line segment). Further, in FIG. 9, reference numeral M8 is a portion of a straight line that is orthogonal to the seventh line segment M7 and extends so as to pass through the center point 29c of the opening 29 and that overlaps the opening 29 (hereinafter referred to as the eighth line segment). Represents. The 7th line segment M7 is shorter than the 8th line segment M8. For example, the length of the 7th line segment M7 is 0.85 or less, more preferably 0.75 or less, and further preferably 0.70 or less, which is the length of the 8th line segment M8.

The container 10 with a lid of the second modification of the first embodiment has a flange even when the pressure of the seal head forming the circumferential seal portion 40 becomes non-uniform in the plane and the seal strength varies. It is possible to allow steam to pass through one of the two notches 23 formed in the portion 22, and it is possible to make it easier for steam to pass through more reliably.

[Third modification of the container with a lid]
A third modification of the first embodiment will be described with reference to the container 10 with a lid of FIG. In addition, in order to avoid complication, in FIG. 10, the configuration located under the lid 30 is also shown by a solid line. The container 10 with a lid of FIG. 10 is different from the first modification of the first embodiment in that the stepped portions 24 are formed at two positions facing each other on the pair of long sides 22a.

The container 10 with a lid of the third modification of the first embodiment also has a flange even when the pressure of the seal head forming the circumferential seal portion 40 becomes non-uniform in the plane and the seal strength varies. It is possible to allow steam to pass through one of the two stepped portions 24 formed in the portion 22, and it is possible to make it easier for the steam to pass through more reliably.

As described above, the container with a lid of the present embodiment can appropriately release steam from the steam venting mechanism of the seal portion even when the flange portion is warped by heating in a microwave oven.

Second Embodiment Next, a second embodiment of the present invention will be described. First, the problem to be solved by the second embodiment will be described.

In the above-mentioned Patent Document 1, a convex portion protruding toward the accommodating portion is formed in a portion of the flange portion located inside the protruding line of the heat seal line, and a convex portion of the flange portion is formed outside the protruding line. A recess recessed toward the accommodating portion is formed in the located portion. In other words, the protruding line of the heat seal line is formed between the convex portion on the inner edge side and the concave portion on the outer edge side of the flange portion. In this case, in the process of heat-sealing the lid to the flange portion using the hot plate, it is necessary to arrange the portion of the hot plate having the pattern corresponding to the protruding line between the convex portion and the concave portion of the flange portion. .. Therefore, the positioning accuracy of the hot plate required in the heat sealing process is improved. As a result, the time and cost required for the heat sealing process increase. An object of the present embodiment is to provide a container with a lid that can effectively solve such a problem.

Hereinafter, the container with a lid 10 of the second embodiment will be described with reference to FIGS. 11 to 20. In the second embodiment, the same parts as those in the first embodiment may be designated by the same reference numerals and detailed description thereof may be omitted. Further, when it is clear that the action and effect obtained in the first embodiment can be obtained in the second embodiment, the description thereof may be omitted.

(Container with lid)
First, the outline of the container with a lid 10 will be described with reference to FIGS. 11 to 13. FIG. 11 is an exploded view of the members constituting the container with a lid 10, and FIG. 12 is a plan view of the container with a lid 10. Further, FIG. 13 is a cross-sectional view showing a case where the container with a lid shown in FIG. 12 is viewed along the line XIII-XIII.

The container 10 with a lid includes a container 20 in which an accommodating portion 25 for accommodating contents is formed, a lid 30 that covers the opening 29 of the accommodating portion 25 of the container 20, and a sealing portion that joins the lid 30 to the container 20. 40 and. Further, the container with a lid 10 further includes a steam venting mechanism 18 for discharging the steam generated in the accommodating portion 25 by heating the contents to the outside of the accommodating portion 25. In addition, in this specification, "bonding" is a concept including both welding and adhesion. By "welding" is meant attaching the lid 30 to the container 20 by at least partially melting at least one of the container 20 or the lid 30. Further, "adhesion" means attaching the lid 30 to the container 20 by using a component such as an adhesive which is separate from the container 20 and the lid 30.

The contents contained in the container 20 contain at least water. Examples of the contents include, for example, retort foods, frozen foods and refrigerated foods. Examples of foods include curry, porridge, fried noodles, side dishes, and fish. In these contents, since the water evaporates with heating and the pressure of the accommodating portion 25 of the container 20 increases, a steam venting mechanism 18 for releasing the steam in the accommodating portion 25 to the outside is required for the container 10 with a lid. Become.

Hereinafter, the container 20, the lid 30, the seal portion 40, and the steam venting mechanism 18 will be described.

〔container〕
As shown in FIGS. 11 to 13, the container 20 includes a body portion 21 defining the accommodating portion 25, and a flange portion 22 connected to the upper portion of the body portion 21 over a circumference. As in the case of the first embodiment, the body portion 21 includes, for example, a bottom portion 211 and a side portion 213 erected from the bottom portion 211 so as to extend around the outer edge of the bottom portion 211. As shown in FIG. 13, the bottom portion 211 may be formed with a raised portion 212 that is raised upward. The flange portion 22 is connected to the upper edge of the side portion 213 of the body portion 21 and extends horizontally toward the outside. In the present specification, the “outside” is the side away from the center point 29c of the opening 29 of the container 20 in a plan view. Further, the “inside” is the side approaching the center point 29c of the opening 29 of the container 20.

In the present embodiment, the flange portion 22 has a substantially rectangular (substantially rectangular) contour. For example, the flange portion 22 has a pair of long side portions 22A, a pair of short side portions 22B, and a corner portion 22C located between the long side portion 22A and the short side portion 22B. The direction in which the long side portion 22A extends and the direction in which the short side portion 22B extends are orthogonal to each other. In FIG. 12, reference numeral L1 represents the distance between the outer edge of one short side portion 22B and the outer edge of the other short side portion 22B, and reference numeral L2 represents the outer edge of one long side portion 22A and the other. It represents the distance between the long side portion 22A and the outer edge. The length L1 is larger than the length L2.

As shown in FIG. 12, the corner portion 22C may have a curved shape that is convex toward the outside. Such a corner portion 22C can be obtained, for example, by chamfering the corner portion of the flange portion having a rectangular contour. Although not shown, the corner portion 22C may have an angular shape. Further, a part of the corner portions 22C among the plurality of corner portions 22C may be a tab 22D protruding outward from the other corner portions 22C.

Note that FIG. 12 shows an example in which the pair of long side portions 22A are parallel to each other, the pair of short side portions 22B are parallel to each other, and the long side portion 22A and the short side portion 22B are orthogonal to each other. However, it is not limited to this. For example, the pair of long side portions 22A may be non-parallel to each other, and the pair of short side portions 22B may be non-parallel to each other. Further, the angle formed by the long side portion 22A and the short side portion 22B may deviate from 90 degrees.

As shown in FIGS. 11 and 12, a notch 23 recessed inward is formed in a part of the outer edge 22y of the flange portion 22. The notch 23 is one of the elements constituting the steam venting mechanism 18 described above. The details of the notch 23 will be described later.

FIG. 13 is a cross-sectional view of the container 10 with a lid of FIG. 12 when the container 10 with a lid of FIG. 12 is cut by the line XIII-XIII that does not pass through the notch 23. In the example shown in FIG. 13, the flange portion 22 includes a first plane 221 that extends flat from the inner edge 22x to the outer edge 22y. However, the present invention is not limited to this, and the flange portion 22 may include an inclined surface, a non-flat surface, and the like. For example, as shown in FIG. 14, the flange portion 22 may include an inclined surface 22e that is inclined downward to reach the outer edge 22y. In this case, the lid 30 may not be joined to the inclined surface 22e.

In FIG. 13, reference numeral T represents the thickness of the container 20. The thickness T of the container 20 is, for example, 0.1 mm or more and 1.0 mm or less. As the thickness T of the container 20 becomes smaller, for example, when the thickness T of the container 20 is 100 μm or more and 300 μm or less, the side portion 213 and the flange portion 22 of the container 20 are likely to be deformed, and when the thickness T is 200 μm or less. , Deformation is more likely to occur.

Further, when the container 20 contains a rubber component or an ethylene component, the container 20 is likely to be deformed. When the container 20 is made of block polypropylene containing, for example, a rubber component or an ethylene component, its rigidity and heat resistance are lower than those of homopolypropylene containing no rubber component or ethylene component.

As a method for producing the container 20, an injection molding method or a sheet molding method can be adopted. When the container 20 is manufactured by injection molding, it is preferable that the height H1 of the container 20 is set to the above-mentioned distance L2 or less in order to ensure moldability. The sheet molding method is a method of pressing a mold against a plastic sheet to form a desired shape on the sheet. Examples of the material constituting the container 20 include plastics such as polystyrene, polypropylene, and polyethylene terephthalate.

Further, when the container 20 is manufactured by processing a plastic sheet by a deep drawing molding method, which is a kind of sheet molding method, a sheet having a thickness of 100 μm or more and 300 μm or less can be used. Examples of the laminated body constituting the sheet include CPP / CNy / CPP and LLDPE / CNy / LLDPE. Here, "CPP" is unstretched polypropylene, "CNy" is unstretched nylon, and "LLDPE" is linear low-density polyethylene.

〔lid〕
The lid 30 is arranged on the first plane 221 on the upper surface of the flange portion 22 so as to cover the opening 29 of the accommodating portion 25 of the container 20, and is joined to the first plane 221 of the flange portion 22 by the seal portion 40. The lower surface 32 of the lid 30 is configured to be able to be joined to the first plane 221 of the flange portion 22. FIG. 15 is a cross-sectional view showing an example of the layer structure of the lid 30. As shown in FIG. 15, the lid 30 includes at least a sealant layer 35 constituting the lower surface 32 of the lid 30 and a base material 34 laminated on the sealant layer 35.

As the material constituting the base material 34, a polyester resin such as polyethylene terephthalate (PET), a polyamide resin such as nylon (Ny), and a polyolefin resin such as polypropylene (PP) can be used. The base material 34 may be composed of a uniaxially or biaxially stretched film. The thickness of the base material 34 is, for example, 5 μm or more and 50 μm or less.

As the material constituting the sealant layer 35, one or more resins selected from polyethylene (PE) such as low density polyethylene (LDPE) and linear low density polyethylene (LLDPE), and polypropylene (PP) are used. Can be used. The sealant layer 35 may be a single layer or a multilayer. Further, the sealant layer 35 is preferably unstretched.

The sealant layer 35 preferably has an easy peel property. The easy peel property means that when the lid 30 is peeled off from the flange portion 22 of the container 20, the lid 30 is easily peeled off from the first flat surface 221 of the flange portion 22 at the lower surface 32 thereof, that is, at the interface of the sealant layer 35. It is a characteristic. The easy peel property can be exhibited, for example, by forming the sealant layer 35 with two or more kinds of resins and making one resin and the other resin incompatible. Examples of the resin capable of exhibiting the easy peel property include a mixed resin of polyethylene (PE) and polypropylene (PP).

The form of peeling the lid 30 from the flange portion 22 of the container 20 is not limited to peeling at the interface of the sealant layer 35 (peeling between the first flat surface 221 of the flange portion 22 and the surface of the sealant layer 35). .. For example, the lid 30 may be detached from the flange portion 22 by cohesive failure of the sealant layer 35, and the lid 30 may be detached from one layer constituting the lid 30 and another layer adjacent thereto. May be peeled off from the flange portion 22.

The thickness of the sealant layer 35 is preferably 20 μm or more and 100 μm or less, and more preferably 30 μm or more and 80 μm or less.

The lid 30 may further include other layers. As the other layer, an appropriate layer can be selected according to the required performance such as water vapor and other gas barrier properties, light shielding properties, and various mechanical strengths. For example, as the gas barrier layer, a metal layer such as aluminum foil, a vapor-deposited layer of a metal such as aluminum or a metal oxide such as aluminum oxide or an inorganic oxide such as silicon oxide, an ethylene-vinyl alcohol copolymer (EVOH), or poly. A vinylidene chloride resin (PVDC), an aliphatic polyamide such as nylon MXD6, or the like may be provided. By providing such a gas barrier layer, it is possible to prevent oxygen and water vapor from infiltrating into the container with a lid 10. Further, a support may be provided in order to impart mechanical strength to the lid material. As the support, the same material as that constituting the base material 34 can be used. The gas barrier layer and the support may be provided between the base material 34 and the sealant layer 35, or may be provided on the surface of the base material 34 opposite to the sealant layer 35.

Examples of the method for laminating the base material 34 and the sealant layer 35 include a melt extrusion method and a dry laminating method. In the melt extrusion method, the material constituting the sealant layer 35 is extruded onto the film containing the base material 34. In the dry laminating method, the sealant layer 35 made of a film formed in advance and the film containing the base material 34 are bonded together using an adhesive. When the dry laminating method is used, as shown in FIG. 15, the lid 30 is located between the substrate 34 and the sealant layer 35 and further includes an adhesive layer 36 made of an adhesive.

Even when the lid 30 is manufactured by the melt extrusion method, the adhesive layer 36 containing the anchor coating agent used in the melt extrusion method may be present on the lid 30.

Examples of the material constituting the adhesive layer 36 include urethane-based and epoxy-based resins, which are two-component curable resins composed of a main agent and a curing agent. The thickness of the adhesive layer 36 is, for example, 1 μm or more and 6 μm or less.

(Seal part)
The sealing portion 40 joins the first flat surface 221 of the flange portion 22 and the lower surface 32 of the lid 30 to seal the accommodating portion 25 of the container 20 from the outside. As shown in FIG. 12, the seal portion 40 is continuously formed between the first plane 221 of the flange portion 22 and the lower surface 32 of the lid 30 so as to surround the opening 29 in a plan view. .. The sealing portion 40 may be formed by at least partially melting at least one of the container 20 or the lid 30. Further, the sealing portion 40 may be formed of a component separate from the container 20 and the lid 30 such as an adhesive. By forming the sealing portion 40 between the lid 30 and the flange portion 22, the accommodating portion 25 of the container 20 can be sealed from the outside.

As shown in FIG. 12, the seal portion 40 is arranged on the main seal portion 42 extending along the flange portion 22 and the long side portion 22A of the flange portion 22, and the protruding seal protruding inward from the main seal portion 42. It has a portion 44 and. In the example shown in FIG. 12, the main seal portion 42 extends parallel to the inner edge 22x of the flange portion 22. The protruding seal portion 44 is located inside the above-mentioned cutout portion 23 of the flange portion 22. Reference numeral 40x represents an inner edge of the seal portion 40, and reference numeral 40y represents an outer edge of the seal portion 40.

FIG. 16 is an enlarged view showing a protruding seal portion 44 of the seal portion 40 of the container with a lid 10 shown in FIG. In addition, in FIG. 16 and FIG. 18 described later, the display of the outer edge 30y of the lid 30 is omitted in order to prevent the figure from becoming complicated.

As shown in FIG. 16, the protruding seal portion 44 of the seal portion 40 includes a pair of first portions 45 extending inward from the main seal portion 42. The pair of first portions 45 intersect at the tip portion 46 located closest to the opening 29 of the protruding seal portions 44. In other words, the protruding seal portion 44 has a substantially triangular shape that protrudes inward. In this case, when the pressure of the accommodating portion 25 of the container 20 increases with heating, the tip portion 46 of the protruding seal portion 44 is first peeled off, and then the first portion 45 of the protruding seal portion 44 is peeled off, and the lid 30 and the flange are peeled off. A steam hole is formed between the portion 22 and the portion 22.

In FIG. 6, reference numeral θ1 is an angle formed by an angle formed by a direction in which the inner edge 40x of one of the first portions 45 of the pair of first portions 45 extends and a direction in which the inner edge 40x of the other first portion 45 extends (hereinafter, the first). 1 Also referred to as tip angle). The first tip angle θ1 between the pair of first portions 45 is less than 180 °. For example, the first tip angle θ1 is 60 ° or more and 150 ° or less. By setting the first tip angle θ1 to 60 ° or more, it is possible to prevent the tip portion 46 of the protruding seal portion 44 from peeling off due to a force applied to the container with a lid 10 other than during heating. Further, by setting the first tip angle θ1 to 150 ° or less, the pressure applied to the seal portion 40 during heating can be effectively concentrated on the tip portion 46 of the protruding seal portion 44.

The specific shape of the protruding seal portion 44 is not limited as long as the protruding seal portion 44 can be peeled off from the flange portion 22 earlier than the main sealing portion 42 when the contents are heated. For example, although not shown, the protruding seal portion 44 may further include a portion other than the above-mentioned first portion 45. For example, the protruding seal portion 44 may include a second portion located between the main seal portion 42 and the first portion 45 and extending in a direction different from that of the first portion 45.

[Steam removal mechanism]
When the protruding seal portion 44 is peeled off, a steam hole is formed between the lid 30 and the flange portion 22, and the steam of the accommodating portion 25 escapes to the outside through the steam hole. As described above, the protruding seal portion 44 is one of the elements constituting the steam venting mechanism 18 for discharging the steam generated in the accommodating portion 25 to the outside of the accommodating portion 25.

The steam venting mechanism 18 is preferably provided so that the distance from the protruding seal portion 44 of the steam venting mechanism 18 to the center point 29c of the opening 29 is shorter than the distance from the main sealing portion 42 to the center point 29c. .. For example, when the contour of the flange portion 22 is substantially rectangular, the protruding seal portion 44 of the flange portion 22 is preferably located in the middle of the long side portion 22A of the flange portion 22 in the direction in which the long side portion 22A extends. .. Thereby, the distance between the center point 29c of the opening 29 and the inner edge 40x of the protruding seal portion 44 can be set to the shortest distance, whereby the protruding seal is caused by the pressure generated when the contents are heated. The force acting on the portion 44 can be further increased.

The above-mentioned notch 23 of the flange portion 22, which is another element constituting the steam venting mechanism 18, is located outside the protruding seal portion 44 as shown in FIGS. 12 and 16. Therefore, the distance from the outer edge 40y of the protruding seal portion 44 to the outer edge 22y of the flange portion 22 can be shortened as compared with the case where the notch portion 23 is not provided. As a result, after the protruding seal portion 44 is peeled off from the flange portion 22, steam easily escapes from the outer edge 22y of the flange portion 22 through the gap between the lid 30 and the flange portion 22.

(Notch)
Hereinafter, the notch 23 of the flange portion 22 will be described in detail. FIG. 17 is a cross-sectional view showing a case where the container with a lid 10 shown in FIG. 12 is cut along the line XVII-XVII passing through the notch 23. Further, FIG. 18 is an enlarged plan view showing the cutout portion 23 for explaining the cutout portion 23 of the flange portion 22. In FIG. 17, the dotted line drawn at the portion indicated by the reference numeral 23 shows an example of the notched region in the case where a part of the outer edge 22y of the flange portion 22 is cut out to form the notched portion 23. There is. In the cross-sectional view shown in FIG. 17, nothing exists in the region surrounded by the dotted line, and it is a notch 23.

As shown in FIGS. 17 and 18, the notch 23 of the flange portion 22 is at least partially in contact with the outer edge 40y of the protruding seal portion 44 of the seal portion 40. In other words, in the horizontal direction, the position of the outer edge 22y of the flange portion 22 in the notch portion 23 and the position of the outer edge 40y of the protruding seal portion 44 of the sealing portion 40 coincide with each other at least partially. As a result, as will be described later, in the step of heat-sealing the lid 30 to the flange portion 22 using the hot plate, the accuracy required for the alignment of the hot plate with respect to the flange portion 22 can be relaxed. This makes it possible to reduce the time and cost required for the heat sealing process. As shown in FIG. 18, a part of the notch 23 of the flange portion 22 is also in contact with the outer edge 40y of the main seal portion 42 extending along the long side portion 22A.

In the example shown in FIG. 17, the lid 30 is configured to cover the notch 23 of the flange portion 22. However, the present invention is not limited to this, and although not shown, a notch portion overlapping the notch portion 23 of the flange portion 22 may be formed on the outer edge 30y of the lid 30. In other words, the position of the notch 23 of the flange portion 22 may coincide with the position of the outer edge 30y of the portion corresponding to the notch 23 of the flange portion 22 of the lid 30. In such a container with a lid 10, for example, after joining the lid 30 to the flange portion 22 of the container 20, the flange portion 22 and the lid 30 are punched out with a predetermined mold to form the outer edge 22y of the flange portion 22 and the outer edge 30y of the lid 30. It can be made by forming a notch.

By the way, the pressure generated in the accommodating portion 25 during heating acts not only as a force for peeling the protruding seal portion 44 but also as a stress for deforming the container 20. When the notch 23 is provided in the flange 22, the stress generated in the flange 22 due to the pressure of the accommodating portion 25 tends to be concentrated on the notch 23. In this case, there is a concern that the container 20 is likely to be deformed starting from the notch 23.

On the other hand, in the above-mentioned Patent Document 1, convex portions protruding inward are formed on the flange portion 22 and the side portion 213 of the container 20. It is considered that the convex portion acts to suppress the deformation of the container 20. On the other hand, if the convex portion is provided on the side portion 213 of the container 20, the volume of the opening 29 is reduced by the amount of the convex portion. It is also possible that the convex portion interferes with the use of the container 20. For example, when food is contained in the container 20, it is conceivable that the convex portion interferes with the eating operation.

In consideration of such a problem, as shown in FIG. 18, it is preferable that the side portion 213 of the container 20 does not have the convex portion as in Patent Document 1 in the vicinity of the notch portion 23. In other words, the portion of the side portion 213 of the container 20 corresponding to the notch 23 (first portion 214) is a portion of the side portion 213 located on both sides of the first portion 214 (a pair of second portions 215). ), It is preferable that the same plane or the same curved surface is formed (see FIG. 11). Since there is no convex portion on the side portion 213, a larger volume of the accommodating portion 25 can be secured. In addition, the usability of the container 20 can be improved.

On the other hand, in the present embodiment, since there are no convex portions or concave portions in the portion of the side portion 213 corresponding to the notch portion 23, it is considered that the container 20 is more easily deformed than in the case of Patent Document 1. In consideration of such a problem, in the present embodiment, it is proposed to set the second tip angle θ2 at the tip of the notch 23 as shown in FIG. 18 to be relatively large. For example, it is proposed that the second tip angle θ2 be larger than the above-mentioned first tip angle θ1 of the protruding seal portion 44.

First, the definition of the second tip angle θ2 will be described. In FIG. 18, reference numerals P3 and P4 represent first and second contacts in which the notch 23 of the flange portion 22 and the outer edge 40y of the main seal portion 42 of the seal portion 40 are in contact with each other. Further, the reference numeral P1 represents a point (hereinafter, also referred to as a tip point) located closest to the opening 29 (accommodation portion 25) of the cutout portions 23. The second tip angle θ2 is defined as an angle formed by a straight line connecting the first contact point P3 and the tip point P1 and a straight line connecting the second contact point P4 and the tip point P1. The first contact P3 and the second contact P4 are also points where the outer edge 40y of the main seal portion 42 and the outer edge 40y of the protruding seal portion 44 are connected.

By making the second tip angle θ2 at the tip of the notch 23 larger than the first tip angle θ1 of the protruding seal portion 44, it is possible to prevent stress from concentrating on the notch 23 during heating. As a result, it is possible to prevent the container 20 from being deformed starting from the notch 23 during heating. The second tip angle θ2 is, for example, 65 ° or more and 160 ° or less. Preferably, the second tip angle θ2 is at least 5 ° or more larger than the first tip angle θ1.

Preferably, the notch 23 is curved with a predetermined radius of curvature at the tip point P1. This makes it possible to prevent stress from concentrating on the tip point P1 of the notch 23 during heating. The radius of curvature of the notch 23 at the tip point P1 is, for example, 2 mm or more and 30 mm or less.

In FIG. 18, reference numeral D1 represents the shortest distance (hereinafter, also referred to as the first shortest distance) between the tip point P1 of the notch 23 of the flange portion 22 and the inner edge 22x of the flange portion 22. Further, the reference numeral D2 is the shortest distance between the inner edge 40x of the main seal portion 42 of the seal portion 40 and the inner edge 22x of the flange portion 22 at the position where the main seal portion 42 and the protruding seal portion 44 are connected (hereinafter referred to as the shortest distance). Also referred to as the second shortest distance). The first shortest distance D1 corresponds to the shortest distance in a plan view from the close contact suppressing mechanism 19 such as the notch 23 to the opening 29. Further, the second shortest distance D2 is from the inner edge 40x of the connecting portion (the portion corresponding to the point P3 or the point P4) to the opening 29 where the main sealing portion 42 and the protruding sealing portion 44 of the sealing portion 40 are connected. , Corresponds to the shortest distance in plan view.
Preferably, the first shortest distance D1 between the notch 23 and the inner edge 22x of the flange 22 is smaller than the second shortest distance D2 between the main seal 42 and the inner edge 22x of the flange 22. As a result, when the peeling of the protruding seal portion 44 progresses to the connection point between the inner edge 40x of the main sealing portion 42 and the inner edge 40x of the protruding seal portion during heating, the steam of the accommodating portion 25 can be discharged to the outside. As a result, the pressure of the accommodating portion 25 can be reduced, so that further peeling of the sealing portion 40 can be suppressed. Therefore, it is possible to prevent the main seal portion 42 from peeling off during heating. The difference between the second shortest distance D2 and the first shortest distance D1 is preferably 1 mm or more.
The first shortest distance D1 and the second shortest distance D2 can be defined in embodiments other than the second embodiment. Further, preferably, the relationship that the first shortest distance D1 is smaller than the second shortest distance D2 is also established in embodiments other than the second embodiment.

The fact that the first shortest distance D1 is smaller than the second shortest distance D2 means that the tip P1 of the close contact suppressing mechanism 19 such as the cutout portion 23 and the stepped portion 24 or the cutout portion 39 described later is a line shown in FIG. It is synonymous with being located inside (opening 29 side) of 401. The line 401 is a line in which the inner edge 40x of the main seal portion 42 is virtually extended to the outer region of the protruding seal portion 44. When the inner edge 40x of the main sealing portion 42 is a curved line instead of a straight line, the virtually extended line 401 also has the same curvature as the inner edge 40x.

(Manufacturing method of container with lid)
Next, an example of a method for manufacturing the container with a lid 10 will be described.

First, a container 20 having an integrally formed body portion 21 and a flange portion 22 is manufactured by an injection molding method using a thermoplastic resin such as polypropylene. Subsequently, a part of the outer edge 22y of the flange portion 22 is cut out to form the notch portion 23 in the flange portion 22. In this way, as shown in FIG. 19, it is possible to obtain the container 20 in which the notch portion 23 is formed in a part of the flange portion 22. The mold used in injection molding may have a shape corresponding to the notch 23. In this case, the step of cutting out a part of the outer edge 22y of the flange portion 22 is unnecessary.

Subsequently, the container 25 of the container 20 is filled with the contents. Also, the lid 30 is prepared. After that, the lid 30 is placed on the upper surface of the flange portion 22 of the container 20. Next, the portion of the lid 30 where the seal portion 40 should be formed is heated from the upper surface 31 side using a hot plate to melt the sealant layer 35 of the lid 30, and the lid 30 is heat-sealed to the flange portion 22. do. FIG. 20 is a plan view showing an example of a process of heat-sealing the lid 30 to the flange portion 22. In FIG. 20, the heating portion 51 of the hot plate that comes into contact with the upper surface of the lid 30 and heats the lid 30 is shown as a hatched region.

As can be seen from the comparison between FIGS. 12 and 20, the inner edge 51x of the heating portion 51 has the same contour as the inner edge 40x of the protruding seal portion 44 of the sealing portion 40. Further, the portion of the outer edge 51y of the heating portion 51 corresponding to the main seal portion 42 also has the same contour as the outer edge 40y of the main seal portion 42. On the other hand, the portion of the outer edge 51y of the heating portion 51 corresponding to the protruding seal portion 44 extends so as to overlap the notch portion 23 of the container 20. That is, the portion of the outer edge 51y of the heating portion 51 corresponding to the protruding seal portion 44 does not have the same contour as the outer edge 40y of the protruding seal portion 44. For example, the portion of the outer edge 51y of the heating portion 51 corresponding to the protruding seal portion 44 extends on the same straight line as the portion of the outer edge 51y of the heating portion 51 corresponding to the main seal portion 42.

Therefore, even if the position of the heating portion 51 of the hot plate with respect to the outer edge 22y of the flange portion 22 deviates from a predetermined position in the heat sealing step, there is a high possibility that an appropriate protruding sealing portion 44 can be obtained. Become. This makes it possible to reduce the time and cost required for the heat sealing process.

Further, since a part of the outer edge 51y of the heating portion 51 extends so as to overlap the notch 23 of the container 20, the protruding seal portion 44 can be formed so that the outer edge 40y is in contact with the notch 23. In other words, the position of the outer edge 40y of the protruding seal portion 44 coincides with the position of the notch portion 23. As a result, after the protruding seal portion 44 is peeled off, steam easily passes through the gap between the lid 30 and the flange portion 22 and escapes from the outer edge 22y of the flange portion 22 in the notch portion 23 to the outside. That is, the permeability of the container with a lid 10 can be improved.

Further, in the present embodiment, there are no convex portions or concave portions on the side portion 213 of the container 20 in the vicinity of the notch portion 23. As a result, it is possible to secure a larger volume of the accommodating portion 25 and improve the usability of the container 20. Further, in the present embodiment, since the second tip angle θ2 at the tip of the notch 23 is larger than the first tip angle θ1 of the protruding seal portion 44, it is possible to prevent stress from concentrating on the notch 23 during heating. can do. Therefore, even if there are no protrusions or recesses in the portion of the side portion 213 of the container 20 corresponding to the notch 23, it is possible to prevent the container 20 from being deformed during heating.

It is possible to make various changes to the above-described embodiment. Hereinafter, modification examples will be described with reference to the drawings as necessary. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding portions in the above-described embodiment will be used for the portions that can be configured in the same manner as in the above-described embodiment. Duplicate explanations will be omitted. Further, when it is clear that the action and effect obtained in the above-described embodiment can be obtained in the modified example, the description thereof may be omitted.

(Deformation example of the concave part of the flange part)
In the above-described embodiment, an example is shown in which the notch 23 of the flange 22 has a substantially triangular shape in a plan view. However, the present invention is not limited to this, and as shown in FIG. 21, the notch portion 23 may have a trapezoidal shape in a plan view. In this case, the contour of the notch 23 may include a straight line 23a extending parallel to the inner edge 22x of the flange 22. The straight line portion 23a is a set of points having the shortest distance between the flange portion 22 and the inner edge 22x. In this case, the above-mentioned tip point P1 is defined as the midpoint of the straight line portion 23a as shown in FIG.

Also in the example shown in FIG. 21, preferably, the second tip angle θ2 formed by the straight line connecting the first contact point P3 and the tip point P1 and the straight line connecting the second contact point P4 and the tip point P1 is the second of the protruding seal portion 44. 1 It is larger than the tip angle θ1. This makes it possible to prevent stress from concentrating on the notch 23 during heating.

(Transformation example of container)
In the above-described embodiment, an example is shown in which a notch 23 is formed in each of the pair of long side portions 22A of the flange portion 22. However, the present invention is not limited to this, and as shown in FIG. 22, the notch portion 23 may be formed only on one of the pair of long side portions 22A of the flange portion 22.

(Transformation example of container)
Further, in the above-described embodiment, an example is shown in which the flange portion 22 of the container 20 has a substantially rectangular (substantially rectangular) contour, but the present invention is not limited to this, and as shown in FIG. 23. , The flange portion 22 may have a circular contour. Also in this modification, a notch 23 in contact with the outer edge 40y of the protruding seal portion 44 is formed in a portion of the outer edge 22y of the flange portion 22 located outside the protruding seal portion 44 of the sealing portion 40. As a result, the accuracy required for the alignment of the hot plate with respect to the flange portion 22 can be relaxed. In addition, the permeability of the container with a lid 10 can be improved.

Further, in the above-described embodiment, an example is shown in which the adhesion suppressing mechanism 19 formed on the flange portion 22 includes a notch portion 23 formed on the outer edge 22y of the flange portion 22. However, the present invention is not limited to this, and in the second embodiment as well, as in the case of the first modification or the third modification of the first embodiment, as shown in FIG. 24, the adhesion suppressing mechanism 19 has a step. The part 24 may be included. The step portion 24 is connected to the outer edge of the first plane 221 of the flange portion 22 and is connected to the flange wall portion 241 extending downward, and the second plane 242 is connected to the lower portion of the flange wall portion 241 and extends in the horizontal direction. including.

As shown in FIG. 24, the step portion 24 of the flange portion 22 is at least partially in contact with the outer edge 40y of the protruding seal portion 44 of the seal portion 40. In other words, in the horizontal direction, the position where the step portion 24 is connected to the first plane 221 and the position of the outer edge 40y of the protruding seal portion 44 of the seal portion 40 coincide with each other at least partially. As a result, in the process of heat-sealing the lid 30 to the flange portion 22 using the hot plate, the accuracy required for the alignment of the hot plate with respect to the flange portion 22 can be obtained, as in the case where the adhesion suppressing mechanism 19 includes the notch portion 23. Can be relaxed. This makes it possible to reduce the time and cost required for the heat sealing process.

(Modification example of protruding seal part)
In the above-described embodiment, the protruding seal portion 44 includes a pair of first portions 45 extending inward from the main sealing portion 42, and the pair of first portions 45 is the most open portion of the protruding seal portions 44. An example of intersecting at the tip portion 46 located on the 29 side is shown. However, the present invention is not limited to this, and as shown in FIG. 25, the protruding seal portion 44 may have a shape curved so as to be convex inward. Further, as shown in FIG. 26, the protruding seal portion 44 has a tip portion 46 connected to the end portion of the pair of first portions 45 on the opening 29 side and extending in parallel with the inner edge 22x of the flange portion 22. You may. In this case, the tip point P2 of the tip 46 is defined as the midpoint of the inner edge of the tip 46 extending parallel to the inner edge 22x.

(Deformation example of the side of the container)
In the first embodiment and the second embodiment described above, an example is shown in which the side portion 213 of the container 20 is a continuous flat surface or a curved surface. However, the present invention is not limited to this, and the rib portion 216 may be formed on the side portion 213 of the container 20. Hereinafter, an example in which the container 20 has the rib portion 216 formed on the side portion 213 will be described with reference to FIGS. 27 to 31.

FIG. 27 is an exploded view of a member constituting the lidded container 10 according to the present modification, and FIG. 28 is a plan view of the lidded container 10 according to the present modification. Further, FIG. 29 is a cross-sectional view showing a case where the container with a lid shown in FIG. 28 is viewed along the XXIX-XXIX line.

As shown in FIGS. 27 and 28, a plurality of rib portions 216 extending from the bottom portion 211 toward the flange portion 22 may be formed on the side portion 213. By forming the rib portion 216 on the side portion 213, the strength of the side portion 213 can be increased.

A part of the rib portion 216 may be formed in the first portion 214 of the side portion 213. Further, some other rib portions 216 may be formed in the second portion 215 of the side portion 213. For example, a plurality of rib portions 216 may be formed on the side portions 213 at regular intervals along the direction in which the first portion 214 and the second portion 215 are arranged. For example, the rib portion 216 may be formed in each of the first portion 214 and the second portion 215 of the side portion 213. Further, the rib portion 216 formed in the first portion 214 and the rib portion 216 formed in the second portion 215 may each have the same shape, for example, have the same protrusion height. May be good.

As shown in FIGS. 27 and 29, a second side portion 217 on which the rib portion 216 is not formed may be interposed between the side portion 213 and the flange portion 22. The second side portion 217 may extend in the vertical direction as shown in FIG. 29. In the following description, the side portion located closer to the bottom portion 211 than the second side portion 217 on which the rib portion 216 is not formed is also referred to as a first side portion 213.

FIG. 30 is a cross-sectional view showing a case where the container 20 of the container with a lid 10 shown in FIG. 29 is viewed along the line XXX-XXX. As shown in FIG. 30, the rib portion 216 is configured to be convex outward, for example. The protruding height of the rib portion 216 that is convex outward is, for example, 5 mm or less.

FIG. 31 is an enlarged plan view showing the notch 23 of the flange portion 22 and the seal portion 40 around the notch portion 23. In the following description, the portion of the flange portion 22 corresponding to the adhesion suppressing mechanism 19 such as the notch portion 23 is referred to as a first flange portion V1. Further, the portions of the flange portion 22 located on both sides of the first flange portion V1 are referred to as second flange portions V2. The first flange portion V1 has a straight line la that passes through one end E1 of the notch portion 23 and is orthogonal to the direction in which the outer edge 22y of the flange portion 22 extends, and the notch portion 23, similarly to the first portion 214 of the side portion 213 described above. It is a portion sandwiched by a straight line lb that passes through the other end E2 and is orthogonal to the direction in which the outer edge 22y of the flange portion 22 extends.

Preferably, the inner edge 22x of the first flange portion V1 of the flange portion 22 extends continuously without including an inflection. For example, as shown in FIG. 31, the inner edge 22x of the first flange portion V1 extends linearly. As a result, the usability of the container 20 can be improved as compared with the case where the inner edge 22x of the first flange portion V1 has a complicated shape including an inflection point. For example, it is possible to secure the area of the opening of the accommodating portion 25 as compared with the case where the inner edge of the flange portion has a convex portion as in Patent Document 1.

Further, preferably, the inner edge 22x of the first flange portion V1 constitutes a straight line or a curved line continuous with the inner edge 22x of the second flange portion V2 adjacent to the first flange portion V1. For example, as shown in FIG. 31, the inner edge 22x of the first flange portion V1 is located on the same straight line as the inner edge 22x of the second flange portion V2. As a result, the seal portion 40 can be stably peeled off at the first flange portion V1 and the steam can be discharged to the outside.

(Deformation example of the rib part of the container)
In the examples of FIGS. 27 to 31, a second side portion 217 in which the rib portion 216 is not formed is interposed between the first side portion 213 in which the rib portion 216 is formed and the flange portion 22. showed that. However, the present invention is not limited to this, and as shown in FIG. 32, the rib portion 216 formed on the side portion 213 of the body portion 21 may reach the inner edge 22x of the flange portion 22.

A part of the rib portion 216 may be formed on the first portion 214 of the side portion 213 so as to reach the inner edge 22x of the first flange portion V1. Further, a part of the rib portion 216 may be formed on the second portion 215 of the side portion 213 so as to reach the inner edge 22x of the second flange portion V2 adjacent to the first flange portion V1. For example, a plurality of rib portions 216 reaching the inner edge 22x of the flange portion 22 have the first portion 214 and the second portion 214 of the side portions 213 at regular intervals along the direction in which the first flange portion V1 and the second flange portion V2 are lined up. It may be formed in the portion 215. For example, the rib portion 216 may be formed in each of the first portion 214 and the second portion 215 of the side portion 213. Further, the plurality of rib portions 216 reaching the inner edge 22x of the first flange portion V1 and the inner edge 22x of the second flange portion V2 may each have the same shape, for example, having the same protrusion height. You may.

Also in this modification, the rib portion 216 is configured to be convex outward as in the case of the examples of FIGS. 27 to 31. That is, the rib portion 216 is configured to project outward from the flat side portion 213. Therefore, even when the rib portion 216 reaches the inner edge 22x of the flange portion 22, it is possible to prevent the area of the opening of the accommodating portion 25 from being reduced due to the rib portion 216. As a result, the usability of the container 20 can be improved as compared with the case where the rib portion is formed so as to be convex inward from the inner edge 22x of the flange portion 22.

In FIGS. 27 to 32, a container with a lid 10 (that is, with a lid according to the second embodiment) in which the outer edge 40y of the protruding seal portion 44 is in contact with the adhesion suppressing mechanism 19 such as the notch 23 of the flange portion 22. An example of forming the rib portion 216 in the container 10) is shown, but the present invention is not limited to this, and the rib portion 216 may be formed in the container with a lid 10 according to the first embodiment.

(Example of deformation of the position of the adhesion suppression mechanism)
In the first embodiment and the second embodiment described above, an example is shown in which a close contact suppressing mechanism 19 such as a notch portion 23 is formed in the central portion of the long side portion 22A of the flange portion 22. However, the present invention is not limited to this, and as shown in FIG. 33, a notch 23 or the like is located near the corner portion 22C of the long side portion 22A of the flange portion 22 other than the central portion, for example, the long side portion 22A. The adhesion suppressing mechanism 19 may be formed. For example, the distance L3 between the center point 25c of the accommodating portion 25 of the container 20 and the center of the notch portion 23 in the direction in which the long side portion 22A extends may be 10 mm or more and 200 mm or less. The distance L3 may be set so that the ratio (= L3 / L1) between the pair of short sides 22b to the distance L1 is, for example, 0.025 or more and 0.5 or less.

Although some modifications to the above-described embodiments have been described, it is naturally possible to apply a plurality of modifications in combination as appropriate. Further, each of the above-described embodiments and modifications thereof may be appropriately combined with other embodiments and modifications thereof.

10 Container with lid 18 Steam venting mechanism 19 Adhesion suppression mechanism 20 Container 21 Body 211 Bottom 212 Raised 213 Side 214 First part 215 Second part 216 Rib 217 Second side 22 Flange 221 Top surface 222 Bottom surface 22a Length Side 22b Short side 22c Corner part 22A Long side part 22B Short side part 22C Corner part 22x Inner edge 22y Outer edge 221 First flat surface 222 Bottom surface 23 Notch part 24 Step part 241 Flange wall part 242 Second flat surface 25 Storage part 29 Opening part 30 Lid 30y Outer edge 31 Upper surface 32 Lower surface 34 Base material 35 Sealant layer 36 Adhesive layer 40 Sealing part 42 Main sealing part 44 Protruding sealing part L1 Longitudinal length of flange part L2 Short side length of flange part H1 Container height h1 Spacing between the lower edge of the lid and the upper edge of the second plane

Claims (15)

A container with a lid having a container in which an opening is formed and a lid that covers the opening and is joined to the container.
The container includes a bottom portion, a side portion erected from the bottom portion, and a flange portion connected to the upper portion of the side portion and including a first plane surface.
A circumferential sealing portion is formed between the lid and the first flat surface of the flange portion.
The seal portion includes a main seal portion and a protruding seal portion that protrudes inward with respect to the main seal portion.
The first plane extends flat from a portion joined to the lid by the seal portion to the inner edge of the flange portion.
A adhesion suppressing mechanism for suppressing the adhesion between the flange portion and the lid is formed on the outside of the protruding seal portion at least at a position corresponding to the protruding seal portion .
The adhesion suppressing mechanism is a container with a lid including a notch formed in the flange portion on the outside of the protruding seal portion. The lid according to claim 1, wherein in the side portion, the first portion corresponding to the protruding seal portion constitutes the same plane or the same curved surface continuous with the second portion located on both sides of the first portion. Attached container. The container with a lid according to claim 1, wherein a rib portion extending from the bottom portion toward the flange portion is formed on the side portion of the container. The container with a lid according to claim 3, wherein the rib portion is formed in each of a first portion corresponding to the protruding seal portion on the side portion and a second portion located on both sides of the first portion. .. The container with a lid according to claim 3 or 4, wherein the rib portion is configured to be convex outward. The container with a lid according to any one of claims 3 to 5, wherein the rib portion extends so as to reach the inner edge of the flange portion. In the flange portion, the inner edge of the first flange portion corresponding to the protruding seal portion constitutes a straight line or a curved line continuous with the second flange portions located on both sides of the first flange portion. The container with a lid according to any one of 5. The container with a lid according to any one of claims 1 to 7, wherein the outer edge of the protruding seal portion is in contact with the notch portion of the flange portion. Of the straight lines extending so as to pass through the tip point of the protruding seal portion and the center point of the opening, the portion connecting the two intersections with the outer edge of the seal portion is referred to as a first line segment, and is referred to as the first line segment. When a portion of a straight line that is orthogonal and extends so as to pass through the center point of the opening and connects two intersections with the outer edge of the seal portion is referred to as a second line segment, the first line segment is the second line segment. The container with a lid according to any one of claims 1 to 8 , which is shorter than that. The container with a lid according to any one of claims 1 to 9 , wherein the protruding seal portion is formed at two or more positions facing each other of the container. The first shortest distance in a plan view from the adhesion suppressing mechanism to the opening is the plan view from the inner edge of the connection portion where the main seal portion and the protruding seal portion of the seal portion are connected to the opening portion. The container with a lid according to any one of claims 1 to 10 , which is shorter than the second shortest distance in the above. A container with an opening,
A bottom portion, a side portion erected from the bottom portion, a flange portion connected to the upper portion of the side portion, including a first plane to which a lid is joined, and a flange portion defining the opening portion are provided.
A adhesion suppressing mechanism for suppressing the adhesion between the flange portion and the lid is formed on the flange portion.
The adhesion suppressing mechanism includes a notch formed in the outer edge of the flange portion, and includes a notch portion.
Wherein the first plane is spread flat up to the inner edge of the notch or al the flange portion, the container. The container according to claim 12 , wherein in the side portion, the first portion corresponding to the adhesion suppressing mechanism constitutes the same plane or the same curved surface continuous with the second portion located on both sides of the first portion. .. The container according to claim 12 , wherein a rib portion extending from the bottom portion toward the flange portion is formed on the side portion. The container according to any one of claims 12 to 14 , wherein the adhesion suppressing mechanism is located on a straight line extending so as to connect the inner edge of the flange portion and the center point of the opening at the shortest distance.

Images