JP6022819B2 - Container with lid - Google Patents

Description

  The present invention relates to a container with a lid having an inner fitting structure, which includes a container body and a lid body having an in-lid fitting portion that fits into an inner circumferential surface of an upper edge of a peripheral side wall of the container body. .

  A container with a lid having an inner fitting structure, more specifically, a container main body having a bottom surface, a peripheral side wall rising from the periphery of the bottom surface, and a container internal fitting portion which is an inner peripheral surface of the upper edge portion of the peripheral side wall An example of a lidded container that includes a lid top surface and a lid body having an in-lid fitting portion that fits inside the in-container fitting portion of the container main body is described in Patent Document 1, for example. As is well known. Containers with a lid with an internal fitting structure are excellent in hermeticity when closed, and can prevent leakage of juice, etc., as a container for noodles such as lunch boxes and pasta and side dishes in convenience stores and supermarkets Widely used.

JP 2006-96363 A

  Sealing in a container with a lid provided with an inner fitting structure includes an inner peripheral surface portion having a shape that gradually decreases in diameter toward the upper side at the upper edge of the peripheral side wall of the container body, and an inner fitting portion formed on the lid body. The fitting portion upper region having a shape that gradually decreases in diameter toward the upper side is formed in close contact with the liquid-tight state when the lid is closed. When the lid is closed, the lower end portion of the inner fitting portion formed in the lid in the upper region of the fitting portion, that is, the outermost protruding portion is the inner circumferential surface of the upper peripheral edge of the peripheral side wall of the container body. It is necessary to get over the upper end of the part, that is, the part that protrudes inwardly, with deformation of the container peripheral side wall itself. This is the same even when the lid is opened.

  And in order to obtain higher airtightness, the inner peripheral surface portion (container internal fitting portion) of the container forming the inner fitting region and the outer peripheral surface portion of the inner fitting portion of the lid body are more Although it is desirable to make close contact with a strong force, the stronger the close contact force, the greater the deformation required in the vicinity of the inner fitting region, and the more difficult it is to open and close (attach and remove) the lid. That is, the conventional container with a lid having an internal fitting structure includes conflicting problems of high sealing performance and easy opening and closing of the lid, and both cannot be satisfied at the same time.

  Then, this invention makes it a subject to provide the container with a lid | cover which can satisfy said 2 conflicting problems which the container with a lid | cover provided with the internal fitting structure has simultaneously. In other words, an object of the present invention is to provide a lidded container having an internal fitting structure that can satisfy both high sealing performance and easy opening and closing of the lid.

  In order to solve the above-mentioned problems, the present inventors have conducted many studies and experiments, and in a lidded container having an internal fitting structure, a part of the upper edge of the peripheral side wall of the container body, that is, the lid By forming a part of the peripheral area that fits with the inner fitting part on the body side so that it can be easily deformed compared to other areas, when the lid is opened and closed, It has been found that the container body can be easily deformed, and as a result, the lid can be easily opened and closed while maintaining high sealing performance. The present invention has been made based on the findings.

  That is, the container with a lid according to the present invention includes a container body including a bottom surface, a peripheral side wall rising from the periphery of the bottom surface, a container fitting portion that is an inner peripheral surface of the upper edge of the peripheral side wall, A container with a lid having an in-lid fitting portion that fits into the in-container fitting portion of the container body, wherein the peripheral side wall of the container body is specified by a part of the bottom surface The vertical distance from the reference plane is at least one place higher than the others, and the upper edge of the peripheral side wall at the raised portion and the upper edge of the peripheral side wall following the both sides smoothly descend. They are connected by a curve, and the trajectory of the upper end edge of the in-lid fitting portion of the lid body has a shape substantially coincident with the trajectory of the upper end edge of the peripheral side wall of the container body.

  In the container with a lid according to the present invention, the vertical distance from the reference surface specified by a part of the bottom surface of the peripheral side wall of the container main body is higher than the others and in the vicinity thereof as compared with other regions of the peripheral side wall. The area per unit width in the circumferential direction is increased by an increase, and when an external force is applied, it is more easily deformed than other parts. Since the region (in-container fitting portion) that becomes the inner fitting surface with the lid is formed along the upper edge of the peripheral side wall of the container main body, the lid and The area serving as the inner fitting surface is wider than the area serving as the inner fitting surface with the same circumferential width in other regions.

  Therefore, the sealed area by the inner fitting when the lid is closed becomes wider as compared with a conventional container with a lid having a conventional inner fitting structure that does not have such a raised portion, and the sealing performance is improved. . On the other hand, the height of the peripheral side wall that continues downward near the raised portion is higher than the peripheral side wall in other regions and is more easily deformed. By opening and closing the lid using the deformation of the lid, the attachment and detachment of the lid are further facilitated. Further, the peripheral wall upper end edge of the raised portion and the peripheral side wall upper end edge following the both sides thereof are connected by a smoothly descending curve, so that the stress distribution during deformation can be made uniform. . In addition, the visual design is improved.

  In one aspect of the container with a lid according to the present invention, the location corresponding to the location where the height of the peripheral side wall of the container body of the lid is increased when the lid is attached to the container body in an internally fitted state. Or the lid picking part toward the outer side is formed in the vicinity. In this aspect, since the lid picking part is provided corresponding to the location where the deformation is easy, the lid can be removed more easily by picking it up with a finger and lifting it.

  In one aspect of the container with a lid according to the present invention, the upper end edge of the peripheral side wall of the container body includes a container flange portion that extends outward, and the upper end edge of the inner fitting portion of the lid body also includes a lid flange portion that extends outward. It is characterized by that. In this aspect, by providing the container flange portion and the lid flange portion, the strength against deformation of the container main body and the lid body can be improved, and the lid body is inadvertently accommodated when it is delivered or taken home. Since it can suppress that it comes off, it becomes an easy-to-use container with a lid. When the above-described lid knob is provided, the lid knob is provided on the outer edge of the lid flange.

  In one aspect of the container with a lid according to the present invention, the lid top surface of the lid body and the bottom surface of the container body are in a substantially parallel posture when the lid body is attached to the container body in an internally fitted state. The height of the lid top surface of the lid is set. In this aspect, the closed containers with the lids can be stably stacked in multiple stages, and a large number of the containers with lids containing foods etc. can be suitably displayed at the store.

  In one aspect of the container with a lid according to the present invention, the container main body and the lid body have a point-symmetric shape in a plan view, and the height of the peripheral side wall of the container main body is increased from the center of the container main body. Two points are formed at point-symmetric positions. In this aspect, since the directionality when the lid is attached to the container body can be eliminated, the workability when the lid is closed is improved in the backyard for storing the foodstuff.

  In the container with a lid according to the present invention, a synthetic resin sheet (for example, a polyester resin such as polyethylene terephthalate, a styrene resin such as polystyrene, or an olefin resin such as polypropylene) or the like is uniaxial or biaxial. A stretched sheet that has been stretched or a foamed sheet obtained by foaming these can be used as a material, and those produced by thermoforming such as vacuum forming, pressure forming, double-sided vacuum forming, and hot plate forming can be used. Moreover, it is preferable to use a transparent sheet among these sheets for the lid, since the deliciousness and freshness of the food contained in the container body can be visually confirmed.

  Further, when the container with a lid according to the present invention is used for packaging cooked ingredients such as pasta and other noodles and curry and omelet rice, the packaging container, particularly the container body, It is preferable to use a foamed sheet of heat-resistant resin as a material, and the foamed sheet is thermoformed. Examples of such a heat-resistant resin include those obtained by adding a polyphenylene resin that is a polymer effective for imparting heat resistance to a polystyrene resin, styrene-methacrylic acid copolymers, and styrene-maleic anhydride. Those containing a copolymer, a styrene-maleimide copolymer, a polyparamethylene resin, and the like can be used. At that time, it is preferable to form a convex surface portion that bulges upward in a substantially arc shape on the bottom surface of the container main body, because the contained food can be uniformly heated by the range.

  In the container with a lid according to the present invention, it is desirable to form reinforcing ribs on the peripheral side wall of the container body, the peripheral side wall of the lid, and the edge of the peripheral side wall. Further, protrusions may be formed on the periphery of the lid top surface so that they do not deviate when the covered containers are stacked on the top surface of the lid, and these protrusions are partially The intermittent shape which was notched may be sufficient and it may be formed in two places or four places which oppose. This protrusion is also useful for reinforcing the lid. In that case, it is desirable that the peripheral edge of the bottom surface of the container body is formed so as to fit inside the protruding portion formed on the top surface of the lid.

  In the container with a lid according to the present invention, when the container with a lid is heated in a microwave oven, the lid body is prevented from being inadvertently removed due to an increase in internal pressure due to vapor generated inside the container. In order to do so, it is preferable to provide an appropriate hole or notch for venting steam.

  ADVANTAGE OF THE INVENTION According to this invention, the container with a lid provided with the internal fitting structure which can satisfy high sealing performance and the ease of opening and closing of a cover body simultaneously is provided.

The perspective view shown in the state which opened one form of the container with a lid | cover by this invention. The side view shown in the state which opened the container with a lid shown in FIG. The top view of the container main body which comprises the container with a lid shown in FIG. The top view of the cover body which comprises the container with a lid shown in FIG. Sectional drawing which follows the aob line of FIG. 3 of a container main body, and sectional drawing which follows the aob of FIG. 4 of a cover body. It is a container with a lid | cover in a closed state, Comprising: The figure corresponded in sectional drawing shown in FIG. The schematic diagram which shows the perpendicular | vertical distance from the reference surface specified by a part of bottom face of a container main body to the upper end edge of a surrounding side wall in the state which expand | deployed the surrounding side wall.

  A container with a lid according to the present invention will be described based on an embodiment. The container A with a lid includes a container body 10 and a lid 30. In this example, the container body 10 is made by thermoforming the above-mentioned heat-resistant styrene resin foam sheet, and the lid 30 is thermoformed from a transparent non-foamed sheet obtained by stretching the styrene resin. It is made. The molding material of the container body 10 and the lid 30 is not limited to this, and the molding method is not limited to this.

[Description of Container Body 10]
The container main body 10 has a bottom surface 11 and a peripheral side wall 12 rising outward from the periphery of the bottom surface 11, and a container flange 13 extending outward is provided at the upper end of the peripheral side wall 12. The strength is improved. Further, the outer periphery of the container flange 13 is provided with a cut prevention process 14 which will be described in detail later. An annular projecting portion 15 that protrudes downward along the periphery is formed slightly inside the periphery of the bottom surface 11, and the annular projecting portion 15 crosses the projecting portion 15. Ribs 16 are formed to improve the strength of the bottom surface 11. By having the projecting portion 15, the bottom surface 11 has a convex surface portion that forms a convex surface upward, which is suitable for uniformly heating the contained food and the like.

  As is well shown in the sectional view of FIG. 5 and the developed view of FIG. 7, in the container body 10 according to the present invention, the height of the bottom surface 11 of the peripheral side wall 12 from the specified reference surface, for example, the top position of the bottom surface 11. Is not uniform and has at least a portion with a raised height. That is, when the virtual plane including a part of the bottom surface 11 (for example, its center point O) which is a substantially flat surface in FIG. The vertical distance h from the peripheral wall 12 to the upper edge 17 of the peripheral side wall 12 is not equal over the entire periphery of the peripheral side wall 12 and is higher than the other parts at least in one place.

  7 shows the vertical distance h (the vertical distance) from the reference surface L including the bottom surface 11 of the container body 10 to the upper edge 17 of the peripheral side wall 12 in the container body 10 shown in FIGS. It is a figure shown in the state which expanded the side wall 12 at 360 degree | times, In this example, it is set as the places P1 and P2 where the vertical distance h was the highest (h1) in two places, 0 degree | times and 180 degree | times. The raised portions P1 and P2 and the peripheral side wall upper end edge 17 continuing on both sides thereof are connected by a smoothly descending curve. In this example, the locations Q1 and Q2 having the lowest height (h2) are at 90 ° and 270 ° positions. The difference between (h1) and (h2) is preferably 3 to 20 mm, and more preferably 5 to 15 mm. When the difference is less than 3 mm, the effect of facilitating the opening and closing of the lid body is not easily exhibited, and when it exceeds 20 mm, molding is difficult.

  In the container body 10, when the outer edges of the bottom surface 11 and the peripheral side wall 12 are both circular, the distance s1 from 0 degrees to 90 degrees, the distance s2, from 90 degrees to 180 degrees, and 180 degrees in the developed view. The distance s3 from 270 degrees to the distance s4 from 270 degrees to 360 degrees are all equal, but in the illustrated case, the outer edges of the bottom surface 11 and the peripheral side wall 12 are both substantially elliptical as shown in FIG. In addition, since the entire shape is point-symmetric with respect to the center point O, in this example, as shown in FIG. 7, s1 = s3> s2 = s4. In any case, the area of the peripheral side wall per unit distance in the circumferential direction increases in proportion to the vertical distance h, and in the illustrated case, the unit is in the vicinity of P1 (0 degree) and P2 (180 degree). The area per distance is the largest, and is the smallest in the vicinity of Q1 (90 degrees) and Q2 (270 degrees).

  As shown well in the cross-sectional view of FIG. 5, the inner peripheral surface of the upper edge of the peripheral side wall 12 of the container body 10 is a region that gradually decreases in diameter toward the upper side, The width d, that is, the distance d from the upper edge 17 of the peripheral side wall 12 is made equal in the entire peripheral region of the peripheral side wall 12 as well shown in the developed view of FIG. The region that gradually decreases in diameter forms the “in-container fitting portion” 18 in the present invention. As described above, the area per unit width of the peripheral side wall 12 is the largest in the vicinity of the 0 degree and 180 degrees. Therefore, the area per unit width in the circumferential direction of the in-container fitting portion 18 is also as follows. It is largest at P1 (0 degrees) and P2 (180 degrees) and its vicinity.

[Description of Lid 30]
Next, the lid 30 will be described. The lid body 30 has substantially the same outer shape as the container body 10 in a plan view, a lid top plate 31, a lid peripheral side wall 32 extending so as to expand downward from the outer periphery of the lid top plate 31, And an in-lid fitting portion 33 formed at the lower end of the lid peripheral side wall 32. Further, as shown in FIG. 4, the lid 30 has a shape that is entirely point-symmetric with respect to the center point O, like the container body 10.

  The in-lid fitting portion 33 includes a fitting portion lower region 34 that extends outward from the lower end of the lid peripheral side wall 32 and a fitting portion upper region 35 that rises upward from the fitting portion lower region 34. The fitting portion upper region 35 has a shape that gradually decreases in diameter toward the upper side. A lid flange portion 36 that extends outward is formed at the upper end of the fitting portion upper region 35. And the fitting part 33 in a lid | cover is made into the shape and magnitude | size which can be internally fitted to the area | region which is formed in the upper edge part of the surrounding side wall 12 of the container main body 10, and is diameter-reduced, ie, the container fitting part 18. FIG.

  That is, the inclination angle of the in-container fitting portion 18 and the inclination angle of the fitting portion upper region 35 of the in-lid fitting portion 33 are substantially the same, and come out to the outermost side of the fitting portion upper region 35. The size of the outer edge of the lowermost end portion of the fitting portion upper region 35 that is the portion that is located is the innermost portion of the in-container fitting portion 18 that is the innermost portion of the in-container fitting portion 18 of the container body 10. It is slightly larger than the outer edge of the upper part. Further, the height of the in-lid fitting portion 33 is substantially the same as the vertical width d of the in-container fitting portion 18 of the container body 10 and the vertical direction in the circumferential direction of the in-container fitting portion 18. It is displaced in the vertical direction over the entire circumference so as to coincide with the displacement in the direction.

  In other words, the vertical width of the fitting portion upper region 35 in the in-lid fitting portion 33 of the lid body 30 is substantially the same as the vertical width d of the in-container fitting portion 18 and is fitted. The trajectory of the upper edge of the upper part region 35 has a shape that substantially matches the trajectory of the upper edge 17 of the peripheral side wall 12 of the container body 10. Therefore, when the fitting portion upper region 35 of the in-lid fitting portion 33 of the lid body 30 is fitted to the in-container fitting portion 18 of the container body 10, the two are brought into close contact with each other, and the lidded container according to the present invention. Will remain sealed.

  In the illustrated lid 30, the outer peripheral portion of the lid flange portion 36 may be subjected to cut prevention processing similarly to the outer peripheral portion of the container flange 13. Further, an appropriate number of ribs 38 in the vertical direction are formed on the lid peripheral side wall 32, and a steam vent cut 39 is formed on the lid top plate 31 as necessary. A lid protrusion 40 is formed on the outer peripheral portion of the lid top plate 31 and located just outside the convex surface portion 15 formed on the bottom surface 11 of the container body 10 when stacked.

  Further, when the lid body 30 is attached to the container body 10 in the inner fitting state, the location of the lid body 30 corresponding to the location P1 where the height of the peripheral side wall 12 of the container body 10 is increased or the vicinity thereof. A lid knob 41 is formed on the outside. In the illustrated example, the lid body 30 is attached to the container body 10 in an in-fitted state in the lid flange 36 formed at the upper end edge of the fitting portion upper region 35 of the in-lid fitting portion 33 formed in the lid body 10. Lid knobs 41, 41 facing outward are formed at or near two locations corresponding to the two locations P1, P2 where the height of the peripheral side wall 12 of the container body 10 is sometimes the highest. . The lid knob 41 is also subjected to the above-described cut prevention process. In addition to the cutting prevention function, the cutting prevention process also acts as a slip stopper for the lid knob 41. If necessary, downward protrusions (not shown) are formed on the lid knobs 41 and 41 in order to prevent the lid knobs 41 and 41 from coming into close contact with the container flange 13 of the container body 10 and becoming difficult to pick. .

  Further, as shown in FIG. 6, in the illustrated lid body 30, when the lid body 10 is attached to the container main body 10 in an internally fitted state, the lid top surface 31 of the lid body 10 and the bottom surface 11 of the container main body 10 The height of the lid top surface 31 of the lid body 30 is set so that is substantially parallel. That is, the height in the vertical direction of the lid peripheral side wall 32 is adjusted so that the lid top surface 31 of the lid body 10 and the bottom surface 11 of the container body 10 are in a substantially parallel posture.

  In FIG. 4, reference numeral 42 denotes an anti-blocking protrusion, which is formed in an appropriate number on the lid peripheral side wall 32 or the like. The protrusions 42 are provided to prevent the lids from getting into each other and blocking when the multiple lids 10 are stacked. An appropriate number of anti-blocking protrusions 42 are provided at different positions for each of a plurality of lids formed simultaneously from the synthetic resin sheet. Thereby, since it is possible to prevent the blocking prevention projections 42 in the plurality of lids from being present at the same position when they are simultaneously molded and then overlapped, it is possible to effectively prevent the lids from coming into close contact with each other. it can. In addition, this kind of protrusion for blocking prevention may be similarly formed in a proper place of the container body 10.

[Attaching / Removing Lid 30 to / from Container Body 10: Effect of the Present Invention]
With the above-described configuration, the lid 30 is attached in a state of being internally fitted to the container main body 10, and after being attached, the fitting portion upper region 35 of the in-lid fitting portion 33 and the in-container fitting portion 18. A high sealed state is maintained between the container body 10 and the inner peripheral surface portion of the container body 10 that gradually decreases in diameter. When attaching the lid 30, it is required that at least either or both of the in-container fitting portion 18 and the in-lid fitting portion 33 are partially deformed. The peripheral wall 12 of 10 has two places (P1, P2) where the vertical distance h from the reference plane L including the bottom surface 11 is higher than the others, and as described above, the area is the circumference. It is configured to be more easily deformed than other regions of the side wall 12. Therefore, in the container 10 with a lid according to the present invention, a portion that is easily deformed is used as compared with a conventional container with a lid that does not have such a region that is easily deformed. By attaching the lid 30, the lid 30 can be attached more easily. This is the same when the lid 30 is removed.

[Other effects of the present invention]
Since the cut prevention process 14 is applied to the container flange portion 13, the lid flange portion 36, and the lid knob portion 41, it can be prevented from being wound even if a finger or the like hits it. In addition, the lid knob 41 can also function to prevent slipping. The cut prevention process 14 is a process of forming a large number of fine irregularities on the periphery of the surface portion or the outer edge, and in the case of the periphery, a wave-shaped portion is formed vertically in a side view. The corrugated portion is formed such that the direction of a large number of peaks and valleys is shortened in the width direction on each side, and the corner is formed in a direction (radial direction) connecting the center of the corner. Such unevenness can be formed, for example, by knurling and processing with knurled eyes such as flat knurled eyes and twill knurled eyes.

  By forming the appropriate number of notches 39 for removing steam on the lid top surface 31 of the lid 30, when the lid-equipped container A is heated in a microwave oven, the internal pressure increases due to the steam generated inside the container. It is possible to prevent the lid 10 from being removed in preparation.

  By making the container body 10 and the lid body 30 point-symmetric, the degree of freedom when attaching the lid body 30 to the container body 10 is increased.

  Furthermore, the peripheral side wall upper end edge 17 of the raised portions P1 and P2 of the peripheral side wall 12 and the peripheral side wall upper end edge continuing on both sides thereof are connected by a smoothly descending curve, and the peripheral side wall 12 is smoothly stressed. It can be dispersed and deformed, and the ease of opening and closing can be exhibited at the same time while ensuring high sealing performance.

A ... Container with lid,
10: Container body,
11 ... Bottom,
12 ... peripheral wall,
13: Container flange,
14 ... Cut prevention part,
17 ... Upper end edge L of the peripheral side wall ... A reference plane which is a virtual plane including the bottom surface,
h: vertical distance from the reference plane L to the upper edge of the peripheral side wall,
P1, P2: The place where the vertical distance h is the highest (h1),
Q1, Q2 ... vertical distance h where the height is lowered (h2),
Q1 and Q2 are at positions of 90 degrees and 270 degrees.
18 ... container fitting part (inner peripheral surface area | region gradually diameter-reduced toward upper direction in the upper edge part of the surrounding side wall of a container main body),
d: the vertical width of the fitting portion in the container,
30 ... the lid,
31 ... lid top plate,
32 ... the peripheral wall of the lid,
33 ... fitting part in the lid,
34 ... lower area of the fitting part,
35 ... Upper area of the fitting part,
36: lid flange,
38 ... ribs,
39 ... Vapor cuts,
41 ... lid picking part.

Claims (4)

A container body provided with a bottom surface, a peripheral side wall rising from the periphery of the bottom surface, and an in-container fitting part which is an inner peripheral surface of the upper edge of the peripheral side wall, a lid top surface, and the in-container fitting part of the container main body A lid-equipped container comprising a lid body having an in-lid fitting portion that fits inside,
The container body and the lid body have a point-symmetric shape in plan view,
The peripheral side wall of the container body is formed at two points symmetrical with respect to the center of the container body, where the vertical distance from the reference surface specified by a part of the bottom surface is higher than the others.
The peripheral side wall upper end edge of the raised portion and the peripheral side wall upper end edge following both sides thereof are connected by a smoothly descending curve,
A container with a lid, wherein a locus of an upper end edge of the in-lid fitting portion of the lid body is substantially coincident with a locus of an upper edge of the peripheral side wall of the container body.   When the lid is attached to the container main body in an internally fitted state, a lid knob facing outward is provided at a location corresponding to a location where the height of the peripheral side wall of the container main body of the lid is increased or in the vicinity thereof. The container with a lid according to claim 1, wherein a portion is formed.   The upper end edge of the peripheral side wall of the said container main body is provided with the container flange part extended outside, and the upper end edge of the in-lid fitting part of the said cover body is also provided with the lid flange part extended outside. A container with a lid according to 1.   The height of the lid top surface of the lid body is such that the lid top surface of the lid body and the bottom surface of the container body are in a substantially parallel posture when the lid body is attached to the container body in an internally fitted state. It is set, The container with a lid | cover as described in any one of Claims 1-3 characterized by the above-mentioned.

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