JP2017114493A - Packaging container and container body used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging container which suppresses warpage of a flange part of a container body in microwave heating and can make steam pass from a steam vent mechanism.SOLUTION: A packaging container includes a container body 10 where an opening part 11 is formed and a lid material 30 which covers the opening part 11 and is joined to the container body 10. The container body 10 includes a bottom wall 14, a side wall 13 raised from the bottom wall 14, and a flange part 12 continuously provided on an upper part of the side wall 13. A circumferential seal part 20 is formed between the lid material 30 and the flange part 12. In a flange part, a protruding seal part 22 as a steam vent mechanism is provided on the inside of a main seal part. In the flange part 12, at least one of a projected part and a recessed part is formed adjacently to a position that is inside of the main seal part 21 and corresponds to the protruding seal part 22.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cooking container for heating cooked mainly by a microwave oven or the like, and a container body used therefor.

  2. Description of the Related Art Conventionally, a package including a container body that contains contents, a flange portion formed on the container body, and a lid member joined to the flange portion by a circumferential seal portion is known. The contents of the package are heated by a microwave oven or the like.

  Here, when the contents contained in the container sealed by the lid material are heated using a microwave oven, the moisture contained in the contents evaporates with the heating, and the pressure in the container accommodating portion is increased. It will increase. When the pressure in the container accommodating portion is increased, the lid and the container may burst and the contents may be scattered to contaminate the inside of the microwave oven. Accordingly, it has been proposed to provide a steam venting function for allowing the steam in the housing portion to escape to the outside by communicating the housing portion with the outside when the pressure in the housing portion of the packaging container exceeds a predetermined value.

  For example, the following Patent Documents 1 and 2 disclose a configuration in which a protruding seal portion protruding inside the container is formed in a part of the circumferential seal portion so that steam can be easily released from the protruding seal portion. ing.

JP-A-62-235080 Japanese Unexamined Patent Publication No. 09-221177

  When the internal pressure in the packaging container rises, the lid member expands from a flat shape to an arc, and this causes the pair of opposing flange portions to be pulled and easily warped upward. The degree of warping of the flange portion depends on the heating condition of the microwave oven, the thickness and material of the flange.

  When the steam is released later, if the upward warping of the flange portion occurs, the lid member of the seal portion and the flange portion are inevitably in 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 member and the flange portion are in close contact with each other and it is difficult for the steam to escape. In this regard, no measures are taken in Patent Documents 1 and 2 described above.

  An object of this invention is to provide the packaging container which can solve such a subject effectively.

  As a result of intensive studies to solve the above problems, the present inventors can solve the above problems by forming at least one of a convex part or a concave part at a position corresponding to the protruding seal part of the flange part. As a result, the present invention has been completed.

  (1) A packaging container comprising a container body in which an opening is formed, and a lid member that covers the opening and is joined to the container body, and includes a vapor escape mechanism, the container body having a bottom A wall, a side wall erected from the bottom wall, and a flange portion connected to the top of the side wall, and a circumferential seal portion is formed between the lid member and the flange portion. A packaging container in which at least one of a convex portion or a concave portion is formed in the flange portion at a position corresponding to the vapor escape mechanism inside the main seal portion.

  (2) The packaging container according to claim 1, wherein the convex portion or the concave portion is formed on both sides of the vapor escape mechanism.

  (3) A bottom wall, a side wall standing upright from the bottom wall, and a flange portion connected to an upper portion of the side wall, the flange portion not reaching the outer edge of the flange portion, A container body in which at least one of the convex portion or the concave portion is formed.

  Since the packaging container of the present invention can suppress the occurrence of warping of the flange portion of the container body during microwave heating, it is possible to easily allow the steam to pass through the steam escape mechanism.

It is a top view of the packaging container of 1st Embodiment of this invention. It is a perspective view of the packaging container of 1st Embodiment of this invention. In FIG. 1, (a) XX sectional drawing, (b) YY sectional drawing. It is a perspective view of the packaging container of 2nd Embodiment of this invention. It is a perspective view of the packaging container of 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments, and may be implemented with appropriate modifications within the scope of the object of the present invention. it can.

<Packing container>
Hereinafter, the packaging container 1 of 1st Embodiment is demonstrated using FIGS. 1-3. FIG. 1 is a plan view of the packaging container of the first embodiment, FIG. 2 is a perspective view of the packaging container of the first embodiment, and FIG. 3 is (a) XX sectional view in FIG. b) YY sectional view. In addition, in order to avoid becoming complicated, the structure located under the lid | cover material 30 is also shown as the continuous line in FIG.

  The packaging container 1 includes a container body 10 and a lid member 30 that covers the opening 11 of the container body 10, and a circumferential seal portion 20 is formed between the container body 10 and the lid member 30. . By joining the container main body 10 and the lid member 30 via the seal portion 20, 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, and may be a polygonal shape, or a circumferential shape and a polygonal shape. It may be a combination.

  The contents stored in the packaging container 1 are not particularly limited, and examples of the contents include retort food, frozen food, refrigerated food, and the like. Examples of the food include curry, rice cake, yakisoba, side dish, and fish. In these contents, since moisture evaporates with heating and the pressure in the housing part of the packaging container 1 increases, a steam venting function for releasing the steam in the packaging container 1 to the outside is provided in the packaging container 1 for cooking. Desired.

[Cover material]
The material constituting the lid member 30 to be joined to the container body 10 is selected so that the lower surface of the lid member 30 can be joined to at least the upper surface of the flange portion 12 of the container body 10. For example, the lid member 30 includes a base material layer and a sealant layer that constitutes the lower surface of the lid member 30. Although the thickness of the lid | cover material 30 is not specifically limited, For example, it can be in the range of 20 micrometers or more and 100 micrometers or less.

  As a material constituting the base material layer, polyester resins such as polyethylene terephthalate, polyamide resins such as nylon, polypropylene, and the like can be used. 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 include polypropylene, biaxially stretched polypropylene is used for the base material layer, and unstretched polypropylene is used for the sealant layer.

[Container body]
The container body 10 can be molded by, for example, an injection molding method or a sheet molding method. It does not specifically limit as a material which comprises the container main body 10, Plastics, such as a polypropylene, a polystyrene, a polyethylene terephthalate, can be used. When manufacturing the container main body 10 by injection molding, in order to ensure moldability, the height H1 (see FIG. 3) of the container main body 10 is set to the length L2 in the short direction of the flange portion 12 of the container main body 10 (FIG. 1). (See below)

  In the present invention, refrigerated (chilled) foods and frozen foods are also assumed as the contents stored in the packaging container 1. In this case, for example, in a container body using conventional homopolypropylene, the impact resistance at low temperatures is lowered. For this reason, the impact resistance in low temperature improves by using the block polypropylene containing a rubber component or an ethylene component. However, the addition of the rubber component or the ethylene component reduces the rigidity of the container body including the flange portion, so that the problem of warping of the flange portion is likely to occur. That is, the packaging container of this invention is used suitably when using the block polypropylene containing a rubber component and an ethylene component as a container main body. Alternatively, even a container body using homopolyethylene is suitably used when the thickness is thin.

  Next, the configuration of the container body 10 will be described with reference to FIGS. The container body 10 includes a bottom wall 14, a side wall 13 erected from the bottom wall 14 so as to spread around the outer edge of the bottom wall 14, and a flat flange portion connected to the upper edge of the side wall 13. 12.

  The lid member 30 is joined to the upper surface of the flange portion 12 of the container body 10 via the seal portion 20. 1 and 2 show an example in which the flange portion 12 is connected to the upper edge of the side wall 13 and extends in the horizontal direction toward the outside. In this specification, terms such as “plane”, “upward”, “downward”, “upper edge”, “horizontal”, “horizontal direction” and the like indicate that the bottom wall 14 of the container body 10 is positioned below. The position and direction of the container main body 10, the lid member 30, and their constituent elements are represented with reference to the state where the container main body 10 is placed on the base.

  One or a plurality of convex portions or concave portions may be formed on the bottom wall 14 like a convex portion 14a shown in FIG. Thereby, when cooking the contents using a microwave oven, it can suppress that the packaging container 1 deform | transforms when the pressure inside a packaging container increases.

  In the present embodiment, in the side wall 13, a first portion 131 corresponding to a notch 125 to be described later constitutes the same plane or the same curved surface that is continuous with the second portions 132 located on both sides of the first portion 131. In the present embodiment, as shown in FIG. 1, the part sandwiched between the straight line la and the straight line lb is the first part 131 of the side wall 13, and the second part 132 of the side wall 13 is located on both sides of the first part 131. The first portion 131 and the second portion 132 of the side wall 13 form one continuous plane. In other words, the inner edge 12X of the flange portion 12 corresponding to the first portion 131 and the second portion 132 of the side wall 13 forms a straight line (see FIG. 1). In addition, when the 1st part 131 of the side wall 13 and the 2nd part 132 of the side wall 13 comprise the same curved surface, the 1st part 131 and the 2nd part 132 form one curved surface which continued.

[Flange part]
The outline of the flange portion 12 is formed by an outer edge 12Y, and has a pair of long sides 12a and a pair of short sides 12b, and has a rectangular outline. As shown in FIG. 1, in the present embodiment, the shape in which a corner portion 12 c is provided between the long side 12 a and the short side 12 b is included in a rectangular shape. That is, in the present embodiment, the outline of the flange portion 12 passes through the long side 12a, the corner portion 12c, the short side 12b, the corner portion 12c, the long side 12a, the corner portion 12c, the short side 12b, and the corner portion 12c. It is formed continuously.

  In FIG. 1, symbol L1 represents the length in the longitudinal direction of the flange portion 12 (interval between one short side 12b and the other short side 12b), and symbol L2 represents the length in the short direction of the flange portion. (The distance between one long side 12a and the other long side 12a), and the length L1 is larger than the length L2. 1 and 2, the corner 12c is located between the long side 12a and the short side 12b and is formed in an outwardly convex arc shape. The corner 12c is obtained, for example, by chamfering a corner of the flange having a rectangular outline.

  By making the length L1 larger than the length L2, even when there is variation in how the lid member 30 swells when the contents are heated using a microwave oven, the length on the long side 12a will be described later. The protruding seal portion 22 can be peeled off from the lid member 30 or the flange portion 12 before the other portions of the seal portion 20.

  In the present invention, the contour shape of the flange portion 12 is not particularly limited, and may be a circle, an ellipse, a polygon, or a combination thereof as a whole. Further, the corner portion 12c is not limited to the curved portion, and may be constituted by a corner portion. Moreover, the thickness of the flange part 12 is set in the range of 0.3 mm or more and 2.0 mm or less, for example.

  The flange portion 12 is a bowl-shaped portion that extends horizontally from the upper edge of the side wall 13. In this embodiment, the flange portion 12 is a cross-sectional view taken along the line XX in FIG. 3A and the line YY in FIG. As shown in a sectional view, the first plane 127 is configured. The first plane 127 is a bowl-shaped portion that extends horizontally from the upper edge of the side wall 13, that is, the inner edge 12 </ b> X of the flange portion, and is a plane that constitutes the seal portion 20.

  Moreover, the subject that the flange part 12 deform | transforms when it cooks with a microwave oven is a subject which expresses notably when the width W1 of the flange part 12 is 8 mm or more. From this, the packaging container of this invention is suitable for the packaging container whose width W1 of the flange part 12 of the container main body 10 is 8 mm or more.

[Notch]
In the present embodiment, a notch 125 formed so as to protrude to the inside of the container body 10 is formed at the central portion in the long side direction of one long side 12 a of the flange portion 12. The cutout portion 125 is a portion where the flat portion extending in the horizontal direction does not exist in the region where the lid member 30 exists, and is shown in FIG. 1 and FIG. 3A as a portion where the first flat surface 127 does not exist. ing. The notch 125 is formed so as to be notched at the outer edge of one long side 12a and to be tapered toward the apex P1, and FIG. 1 shows an example in which the notch 125 is triangular. Yes. In the present invention, the notch 125 is not essential, but by forming the notch 125 below the lid member 30, even if the flange portion 12 including the projecting seal portion 22 is warped, steam is allowed to pass through. It can be made easier. Therefore, it is preferable that a notch is formed outside the projecting seal portion 22 at a position corresponding to the projecting seal portion 22. In the present invention, the notch portion may not be provided in the region where the lid member 30 exists.

[Concave]
The flange portion 12 has a recess 16 that is recessed with respect to the first plane 127. Specifically, the outer edge of the recess 16 is connected to the first plane 127, and the inner surface and the outer surface protrude downward from the lower surface of the first plane 127. In the first embodiment, as shown in FIGS. 1 and 2, a total of six recesses 16 are formed, three on each side across the protruding seal portion 22. As described above, a plurality of recesses 16 may be formed, or only one recess may be formed, but preferably, the recesses 16 are formed on both sides with the protruding seal portion 22 interposed therebetween.

  As shown in FIG. 3B, each recess 16 is formed from the inside of the main seal portion 21 so as not to reach the main seal portion 21 and to reach the side wall 13 of the container body 10. . Thereby, the curvature of the flange part 12 can be suppressed.

  The inner surface shape of the recess is not particularly limited, and may have a curved surface recessed downward as in the present embodiment. Specifically, the cross-sectional view along the direction of the long side 12a may be an arc shape, and the cross-sectional view along the direction of the short side 12b may be a rectangular shape. Further, the present invention is not limited to this, and it is composed of a vertical side wall plane and a horizontal bottom wall surface, and both the sectional view along the direction of the long side 12a and the sectional view along the direction of the short side 12b are both rectangular. It may be configured.

  The maximum depth H2 of the concave portion 16 from the first plane 127 is preferably 1 mm or more and 5 mm or less.

  The recess 16 is preferably formed such that the width W2 in the direction parallel to the direction in which the short side 12b of the recess 16 extends is more than half of the width W1 of the flange portion 12. Thereby, the rigidity of the flange part 12 can be improved and it can suppress more that the flange part 12 deform | transforms.

  Further, it is preferable that the area occupied by the recess 16 is 10% or more in a region 50 mm away from the center of the steam escape mechanism of the flange 12 along the direction in which the flange 12 extends. And more preferably 20% or more. In FIG. 1, the top portion P <b> 2 of the projecting seal portion 22 corresponds to the center of the steam release mechanism, and regions that are 50 mm away from the center of the steam release mechanism of the flange portion 12 along the direction in which the flange portion 12 extends respectively This corresponds to the area obtained by multiplying the line connecting points 50 mm apart from each other along the direction in which the inner edge 12X of the flange portion 12 extends as the center and the width W1 of the flange portion 12. Thereby, the rigidity of the flange part 12 can be improved and it can suppress more that the flange part 12 deform | transforms.

[Seal part]
As shown in FIG. 1, between the lid member 30 and the flange portion 12 of the container body 10, a circumferential seal portion 20 that joins the lid member 30 and the flange portion 12 is continuously formed over the entire circumference. ing. The circumferential seal portion 20 may be formed by at least partially melting at least one of the container main body 10 and the lid member 30 by a sealing means such as heat, ultrasonic waves, and high frequency. Further, the seal portion 20 may be formed of a component separate from the container body 10 and the lid member 30 such as an adhesive. By forming the seal portion 20 between the lid member 30 and the flange portion 12, the opening 11 of the container body 10 can be sealed without a gap.

  As shown in FIG. 1, the circumferential seal portion 20 includes a main seal portion 21 extending along a long side 12 a, a short side 12 b, and a corner portion 12 c which are outer edges of the flange portion 12, and the length of the flange portion 12. It is arrange | positioned at the approximate center part on the side 12a, and is comprised by the protrusion seal | sticker part 22 which protruded inward from the main seal | sticker part 21. As shown in FIG. In the present embodiment, the protruding seal portion 22 is a steam release mechanism, but the steam release mechanism is not limited to the protruding seal portion. For example, the seal strength of a part of the circumferential seal portion 20 is higher than that of other portions. It is good also as a mechanism in which vapor | steam escapes from a part of circumferential seal | sticker part 20 by making small.

  The main seal portion 21 is formed on the outer side with respect to the concave portion 16, that is, on the outer edge side of the flange portion 12.

  The projecting seal portion 22 is formed on a first plane 127 located inside the notch 125, and is provided in a substantially V shape having a top portion P2 projecting inside the container body 10 along the notch 125. Yes.

  In addition, in this invention, the flange part which comprises the circumferential seal part 20 is not restricted to a plane, A convex part is formed in a flange part, and the circumferential seal part 20 is formed through this convex part. Also good.

<Action of packaging container>
When the contents of the packaging container 1 containing the contents are heated using a microwave oven, the temperature of the contents increases, and accordingly, the water contained in the contents evaporates and the pressure inside the packaging container 1 is increased. Will increase. When the pressure inside the packaging container 1 further increases with heating, the lid member 30 swells, and stress is applied to the circumferential seal portion 20.

  As a result, in the conventional packaging container in which the concave portion is not formed in the flange portion, the flange portion warps upward, and the lid member 30 and the flange portion 12 are in close contact with each other, making it difficult for steam to escape, even if P2 is preferential. Even if it peels off, it may be difficult to escape the steam.

  On the other hand, in the packaging container of this embodiment, since the recessed part 16 is formed in the flange part 12, it can suppress that the flange part 12 containing the protrusion sealing part 22 warps. Therefore, it becomes difficult for the cover member 30 and the flange portion 12 to be in close contact with each other, and the vapor is easily released.

<Other embodiment of packaging container>
2nd Embodiment of the packaging container of this invention is described using the packaging container 1A of FIG. In the description of other embodiments below, the same reference numerals as those in the first embodiment will be replaced with the description in the first embodiment, and the description thereof will be omitted. The same applies to the third embodiment. In addition, in order to avoid becoming complicated, the structure located under the lid | cover material 30 is also shown as the continuous line in FIG.

  The packaging container 1A of the second embodiment is different from that of the first embodiment in that the recess 16a formed in the flange portion 12 constitutes the characters “Hot attention!”. By configuring the character information with the recess 16a, in addition to the effect of suppressing the warpage of the flange portion 12, information such as alerting the user can be given. Thus, letters, numbers, figures, symbols, and the like may be configured by the recesses.

  3rd Embodiment of the packaging container of this invention is described using the packaging container 1B of FIG. In addition, in order to avoid becoming complicated, the structure located under the lid | cover material 30 is also shown as the continuous line in FIG. The packaging container 1 </ b> B of the third embodiment is different from the first embodiment in that a convex portion 16 b protruding from the first plane 127 is configured instead of the concave portion 16. Specifically, the convex portion 16 b has an outer edge connected to the first plane 127, and an inner surface and an outer surface protrude upward from the upper surface of the first plane 127. In the present embodiment, a total of six convex portions 16 b are formed in a hemispherical shape, three on each side across the protruding seal portion 22. The maximum height of the convex portion 16b is preferably 3 mm or less. Similarly to the concave portion 16, the convex portion 16 b can also increase the rigidity of the flange portion 12 and suppress deformation of the flange portion 12.

  In the above-described embodiment, the example in which the concave portion or the convex portion is formed in the flange portion has been described, but the concave portion and the convex portion may be formed in the flange portion. Moreover, a letter, a number, a figure, a symbol, etc. may be comprised by the convex part.

DESCRIPTION OF SYMBOLS 1 Packaging container 10 Container body 11 Opening part 12 Flange part 12a Long side 12b Short side 12c Corner part 12X Inner edge 12Y Outer edge 125 Notch part 127 1st plane 13 Side wall 131 Side wall 1st part 132 Side wall 2nd part 14 Bottom wall 14a Convex part 16, 16a Concave part 16b Convex part 161 Inner edge of the side wall of the container body 20 Seal part 21 Main seal part 22 Protruding seal part 30 Lid L1 Length in the longitudinal direction of the flange part L2 Short direction of the flange part Length H1 Height of container body H2 Maximum depth of recess

Claims (3)

A packaging body comprising a container main body in which an opening is formed, and a lid member that covers the opening and is joined to the container main body, and includes a vapor escape mechanism,
The container body includes a bottom wall, a side wall erected from the bottom wall, and a flange portion continuously provided on an upper portion of the side wall,
A circumferential seal portion is formed between the lid member and the flange portion,
The packaging container in which at least one of a convex part or a recessed part is formed in the said flange part inside the said main seal part, and the position corresponding to the said vapor | steam escape mechanism.   The packaging container according to claim 1, wherein the convex portion or the concave portion is formed on both sides of the vapor escape mechanism. A bottom wall, a side wall erected from the bottom wall, and a flange portion connected to the top of the side wall,
The container main body in which at least one of the said convex part or a recessed part is formed in the said flange part so that the outer edge of the said flange part may not be reached.

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