JP7011277B2 - Inner / outer fitting structure of packaging container and packaging container provided with it - Google Patents

Description

The present invention relates to an internal / external fitting structure of a packaging container molded from a synthetic resin sheet and suitable for packaging contents such as foods to which juice exudes, and a packaging container provided with the same.

Foods such as lunch boxes, vegetables, fruits, and side dishes are displayed in the food departments of retail stores such as supermarkets, convenience stores, and department stores, and these are packaged in packaging containers molded from transparent synthetic resin sheets. Many things can be seen.
Foods such as bento boxes, vegetables, fruits, and side dishes may exude juice and may collect inside the container. In some cases, it may be necessary to enclose a liquid such as soup stock. Therefore, the juice may leak when the container containing the food is tilted.

Therefore, in the following Patent Document 1, a packaging container composed of a container body having a fitted portion on the peripheral portion and a lid having a fitting portion that can be fitted to the fitted portion of the container body. The fitted portion is formed in a size substantially corresponding to the fitted portion, and is formed on the inner wall of the fitted portion as the container body is closed by the lid. On the other hand, the pressing force by the inner wall of the fitting portion acts, and the fitting portion and the fitting portion can be fitted to each other. Containers are shown.

The following Patent Document 2 describes an internal / external fitting type including a container body having a fitting ridge provided around the upper portion of a side wall and a lid having a fitting ridge fitted to the fitting ridge. A part of the contact plane on the container body side where the contact plane on the lid side comes into contact with the side wall extending from the bottom surface of the container body to the fitting ridge. For inner / outer fitting type packaging that can prevent biting of stored items while ensuring airtightness, characterized by forming an inclined surface that avoids contact with the contact plane on the lid side while leaving it. The container is shown.

Japanese Unexamined Patent Publication No. 2002-193292 Japanese Unexamined Patent Publication No. 2007-176507

The packaging container provided with the inner / outer fitting structure has high airtightness, can prevent leakage of food juice and the like, and is suitable for packaging foods having a lot of juice.
However, since the inner / outer fitting structure is highly airtight, the pressure inside the container increases when the lid is closed, and as shown in FIG. 7A, the top plate of the lid bulges and rises. There was something. Further, as shown in FIG. 7B, the lid cannot be closed tightly and the whole or a part of the lid is in a floating state, a gap is created between the container body and the lid, and juice leaks. Sometimes.

Therefore, an object of the present invention is to provide an internal / external fitting structure of a packaging container that can be easily closed while suppressing an increase in internal pressure inside the container while ensuring airtightness, and a packaging container provided with the internal / external fitting structure. There is something in it.

The inner / outer fitting structure of the packaging container according to the embodiment of the present invention is the inner / outer fitting structure of the packaging container that fits the container body and the lid, and the fitting convex provided on either the container body or the lid. It is provided with a portion and a fitting recess that can be fitted to the fitting convex portion provided on either the container body or the lid, and the fitting convex portion and the fitting concave portion are opposite to the base end portion side in the cross section. A tapered lower inclined surface and a tapered upper inclined surface are provided on the tip side, and the lower inclined surfaces of the fitting convex portion and the fitting concave portion overlap each other to prevent the lid from coming off from the container body. The length of the upper inclined surface located inside the container of the fitting convex portion at the place where the inside and outside are fitted is made longer than the length of the upper inclined surface located outside the container of the fitting convex portion, and the fitting convex portion is formed. The height of the lower inclined surface located inside the container is made lower than the height of the lower inclined surface located outside the container of the fitting convex portion, and the upper inclined surface located inside the container of the fitting convex portion is fitted. It is characterized by having an inclination of 20 ° to 60 ° with respect to the height direction of the convex portion .

The inner / outer fitting structure of the packaging container is easy to close. The conventional packaging container having an internal / external fitting structure, which has a performance of preventing juice leakage, has improved airtightness, and it is difficult for the air inside to escape when the lid is closed. On the other hand, in the inside / outside fitting structure, the length of the upper inclined surface located inside the container of the fitting convex portion is longer than the length of the upper inclined surface located outside the container of the fitting convex portion, so that the inside is formed. It prevents the outside air from being shut off in an instant, and while the fitting part inside the container fits, the air inside the container can be discharged smoothly, and the internal pressure inside the container body drops, making it easier to close the lid. It is presumed to be.

In the inner / outer fitting structure of the packaging container of the above embodiment, the upper inclined surface located inside the container of the fitting convex portion is inclined at 20 ° to 60 ° with respect to the height direction of the fitting convex portion. There is .

With such a configuration, the internal pressure inside the container can be appropriately lowered when the lid is closed, and the lid can be easily closed.

In the inner / outer fitting structure of the packaging container of the above embodiment, the lower inclined surface located inside the container of the fitting convex portion is inclined at 0 ° to 30 ° with respect to the height direction of the fitting convex portion, and is fitted. The lower inclined surface and the upper inclined surface located inside the container of the joint convex portion can be configured to intersect at a height of 25% to 90% with respect to the height of the inside of the container of the fitting convex portion.

By setting the angle and height of the lower inclined surface located inside the container of the fitting convex portion within the above range, the container can be easily opened while maintaining the sealing property when the lid is closed.

In the inner / outer fitting structure of the packaging container of the above embodiment, the angle of the upper inclined surface located inside the container of the fitting convex portion with respect to the height direction of the fitting convex portion is set to the outside of the container of the fitting convex portion. It can be made smaller than the angle with respect to the height direction of the upper inclined surface located at.

With such a configuration, the upper inclined surface on the outside of the container becomes parallel to the bottom surface of the container body, and when the fitting concave portion fits into the fitting convex portion, the edge portion of the fitting concave portion is formed. It will be pushed out. Therefore, the air inside the container body can be released while the fitting portion on the outside of the container is fitted to reduce the internal pressure, and the lid can be easily closed.

The present invention also covers a packaging container having the above-mentioned internal / external fitting structure.

It is a perspective view of the packaging container of one Embodiment of this invention. It is sectional drawing of the packaging container of FIG. It is a partially enlarged sectional view of the packaging container of FIG. It is a figure which added the dimension line to the partially enlarged sectional view of FIG. It is a partially enlarged sectional view which showed the closed state of the packaging container of FIG. It is a partially enlarged sectional view which showed the state in the process of closing a lid of the packaging container of FIG. It is a figure exemplifying the inside and outside fitting structure of the conventional packaging container.

Hereinafter, an embodiment of the inner / outer fitting structure of the packaging container of the present invention will be described with reference to the drawings.

As shown in FIG. 1 or 2, the inner / outer fitting structure 1 of the packaging container according to the embodiment of the present invention comprises a fitting convex portion 4 and a fitting concave portion 5, and for example, foods such as vegetables and prepared foods. Can be used for the packaging container 1a for accommodating.
Hereinafter, the packaging container 1a will be described. As shown in FIG. 1 or 2, the packaging container 1a includes a container body 2 and a lid 3.

The container body 2 and the lid 3 can be manufactured, for example, by thermoforming a synthetic resin sheet having a sheet thickness of 0.1 mm to 3 mm, preferably 0.2 mm to 1.5 mm. The synthetic resin sheet may be foamed or non-foamed, for example, a polyolefin resin sheet such as a polyethylene resin sheet or a polypropylene resin sheet, a polystyrene resin sheet, a polyethylene terephthalate resin sheet or a glycol-modified polyethylene terephthalate resin sheet. Examples thereof include thermoplastic resin sheets such as polyester resin sheets. Further, a laminated sheet can also be used, and examples of the laminated sheet include a film-laminated foamed sheet in which a film is laminated on a foamed sheet, a co-extruded laminated sheet, and an extruded laminated sheet. The sheet thickness may be different between the container body 2 and the lid body 3.
Examples of thermoforming include vacuum forming, compressed air forming, vacuum forming and hot plate forming.
The container body 2 and the lid 3 may be colored such as black or white, but are preferably transparent or translucent so that the inside can be visually recognized. The lid 3 is preferably transparent so that the inside can be visually recognized, and the two may be different, such as making the lid 3 transparent and the container body 2 white. Further, the container body 2 and the lid 3 may be provided with a design such as a pattern.

As shown in FIG. 1 or 2, the container body 2 has an inverted truncated cone shape, and a peripheral wall portion 22 that is inclined while expanding upward is formed on the peripheral edge of the bottom surface portion 21 having a plan view disk shape. be. The shape of the container body 2 is not limited to this, and can be various shapes such as a rectangular parallelepiped shape, a cubic shape, a columnar shape, and a hexagonal columnar shape.
The inside of the container main body 2 is a storage portion 23 that can store food and the like, and the upper portion thereof is a storage portion 24. On the peripheral edge of the opening 24, a flange portion 25 projecting outward is formed over the entire circumference. On the surface of the flange portion 25, a fitting convex portion 4 projecting upward is formed over the entire circumference so that the lid body 3 can be detachably fitted. A pinch portion 26 is formed on a part of the outer edge of the flange portion 25 so as to project in a semicircle or a triangular shape in a plan view.

As shown in FIG. 3 or 4, the fitting convex portion 4 is formed in a reverse tapered shape on the lower side, that is, formed so as to be thicker toward the tip portion and tapered on the upper side in the cross section. That is, it is formed so as to taper toward the tip. The lower side of the fitting convex portion 4 is the lower inclined surface 41a, 41b, and the upper side is the upper inclined surface 42a, 42b. The tip surface portion 43 on the tip end side of the fitting convex portion 4 is planar.
The lower inclined surface 41a and the upper inclined surface 42a or the lower inclined surface 41b and the upper inclined surface 42b may be formed so as to be continuous, but another surface such as a vertical surface may be interposed between them.

As shown in FIG. 3, the fitting convex portion 4 has a length L1 of the upper inclined surface 42a located inside the container longer than the length L2 of the upper inclined surface 42b located outside the container. The length L1 of the upper inclined surface 42a is not particularly limited, but is preferably 1.5 mm to 20 mm, particularly preferably 2 mm to 10 mm, and further preferably 3 mm to 8 mm. The length L2 of the upper inclined surface 42b is not particularly limited, but is preferably 0.3 mm to 15 mm, particularly preferably 0.5 mm to 10 mm, and further preferably 1 mm to 4 mm.

The height of the fitting convex portion 4 inside the container (in the present embodiment, the protrusion width from the lower end portion of the lower inclined surface 41a; the dimension h1 in FIG. 4) is not particularly limited, but is preferably 2 mm to 30 mm. It is particularly preferably 3 mm to 15 mm, and even more preferably 4 mm to 6 mm.

The height of the fitting convex portion 4 on the outside of the container (in the present embodiment, the protrusion width from the upper surface of the flange portion 25; the dimension h5 in FIG. 4) is the same as the height on the inside of the container of the fitting convex portion 4, but is different. It is also good, but is not particularly limited, but is preferably 2 mm to 30 mm, particularly preferably 3 mm to 15 mm, and even more preferably 4 mm to 6 mm.

The lower inclined surface 41a inside the container of the fitting convex portion 4 is a planar inclined surface inclined inward of the container in the cross section, and is in the height direction of the fitting convex portion 4 (arrow X direction in FIG. 4, the same applies hereinafter). The angle with respect to (θ1 in FIG. 4) is preferably 0 ° to 30 °, particularly preferably more than 0 ° and less than 30 °, and more preferably 5 ° to 20 °.

The upper inclined surface 42a inside the container of the fitting convex portion 4 is a planar inclined surface inclined to the outside of the container in the cross section, and the angle of the upper inclined surface 42a with respect to the height direction of the fitting convex portion (FIG. It is preferable that θ2) of 4 is smaller than the angle of the upper inclined surface 42b with respect to the height direction (θ4 in FIG. 4). The angle (θ2) of the fitting convex portion 4 of the upper inclined surface 42a with respect to the height direction is more specifically preferably 20 ° to 60 °, particularly preferably 25 ° to 50 °, and even more preferably. It is 30 ° to 40 °.

The lower inclined surface 41a and the upper inclined surface 42a intersect at a height of 25% to 90% (h2 in FIG. 4) with respect to the height (h1) inside the container of the fitting convex portion 4. The height is preferably 45% to 85%, particularly preferably 50% to 82%, and even more preferably 55% to 80%. Specifically, it is preferable that they intersect at a height of preferably 1 mm to 27 mm, particularly preferably 2 mm to 13 mm, and even more preferably 3 mm to 5 mm.

The lower inclined surface 41b on the outer side of the container of the fitting convex portion 4 is a planar inclined surface inclined to the outer side of the container in the cross section, and is an angle with respect to the height direction of the fitting convex portion 4 (θ3 in FIG. 4). Is 0 ° to 30 °, preferably 0 ° to 20 °, particularly preferably more than 0 ° and less than 20 °, and more preferably 2 ° to 10 °.

The upper inclined surface 42b on the outer side of the container of the fitting convex portion 4 is a planar inclined surface inclined inward of the container in the cross section, and is an angle with respect to the height direction of the fitting convex portion 4 (θ4 in FIG. 4). Is 15 ° to 70 °, preferably 20 ° to 50 °, particularly preferably 25 ° to 50 °, and even more preferably 25 ° to 45 °.
In the present embodiment, the lower inclined surfaces 41a and 41b are formed in an asymmetrical reverse taper shape, but the present invention is not limited to this, and the lower inclined surfaces 41a and 41b may be formed in a symmetrical reverse taper shape.

The tip surface portion 43 is formed in an annular shape in a plan view having a surface width (W1 in FIG. 4) preferably 0.5 mm to 20 mm, particularly preferably 1 mm to 10 mm.
In the present embodiment, the tip surface portion 43 is formed in a horizontal plane shape, but the present invention is not limited to this, and the tip surface portion 43 may be formed in an inclined surface shape, a convex curved surface shape inflated in a cross section, or a concave curved surface shape indented. good.

As shown in FIG. 1 or 2, the lid 3 is formed with a fitting recess 5 projecting upward on the peripheral edge of the circular flat plate-shaped top plate portion 31 over the entire circumference. The fitting concave portion 5 has a similar shape to the fitting convex portion 4 which is one size larger than the fitting convex portion 4 in the cross section, and the fitting convex portion 4 fits inside the fitting concave portion 5 to form a container. The lid 3 can be closed to the main body 2. A flange portion 32 is formed around the outer edge of the lid 3 so as to slightly project outward, and a grip portion 33 projecting in a semicircular or triangular shape in a plan view is formed in a part thereof. ..
The shape of the lid 3 is not particularly limited, and may be a shape that covers the opening 24 of the container body 2.
The vicinity of the center of the top plate portion 31 of the lid 3 may be slightly bent in advance. By doing so, when the lid 3 is fitted to the container body 2, the top plate 31 can be made into a flat plate by internal pressure.

The fitting concave portion 5 may have a shape corresponding to the fitting convex portion 4, but more specifically, it is as follows.
As shown in FIG. 3 or 4, the fitting recess 5 has a lower side formed in an inverted tapered shape and an upper side formed in a tapered shape, and the lower side is a lower inclined surface 51a, 51b and an upper side. Is set as the upper inclined surfaces 52a and 52b. The tip surface portion 53 on the tip end side of the fitting recess 5 is planar. The back surface side of the lid of the fitting recess 5 is an opening 54 so that the fitting protrusion 4 can be inserted.

As shown in FIG. 3, the fitting recess 5 has a length L3 of the upper inclined surface 52a located inside the lid body longer than the length L4 of the upper inclined surface 52b located outside the lid body. The length L3 of the upper inclined surface 52a is not particularly limited, but is preferably 1.5 mm to 20 mm, particularly preferably 2 mm to 10 mm, and further preferably 3 mm to 8 mm. The length L4 of the upper inclined surface 52b is not particularly limited, but is preferably 0.3 mm to 15 mm, particularly preferably 0.5 mm to 10 mm, and further preferably 1 mm to 4 mm.

The height inside the lid of the fitting recess 5 (in the present embodiment, the protrusion width from the lower end of the lower inclined surface 51a; the dimension h3 in FIG. 4) is not particularly limited, but is 2 mm to 30 mm, particularly 3 mm. It is preferably ~ 15 mm, more preferably 4 mm to 6 mm.

Even if the height of the fitting recess 5 on the outside of the lid (in the present embodiment, the protrusion width from the upper surface of the flange 32 of the lid 3; the dimension h6 in FIG. 4) is the same as the height of the fitting recess 5 on the inside of the lid. It may be different, and is not particularly limited, but is preferably 2 mm to 30 mm, particularly 3 mm to 15 mm, and more preferably 4 mm to 6 mm.

The lower inclined surface 51a inside the lid of the fitting recess 5 is a flat inclined surface that inclines toward the inside of the lid in the cross section, and is in the height direction of the fitting recess 5 (arrow Y direction in FIG. 4, the same applies hereinafter). The angle with respect to (θ5 in FIG. 4) is preferably 0 ° to 30 °, particularly preferably more than 0 ° and less than 30 °, and more preferably 5 ° to 20 °.

The upper inclined surface 52a inside the lid of the fitting recess 5 is a flat inclined surface inclined to the outside of the container in the cross section, and the angle of the upper inclined surface 52a with respect to the height direction of the fitting recess (FIG. 4). It is preferable that θ6) of the above is smaller than the angle of the upper inclined surface 52b with respect to the height direction (θ8 in FIG. 4). The angle (θ6) of the fitting recess 5 with respect to the height direction is more specifically preferably 20 ° to 60 °, particularly preferably 25 ° to 50 °, and even more preferably 30 ° to 40 °. be.

The lower inclined surface 51a and the upper inclined surface 52a intersect at a height of 25% to 90% (h4 in FIG. 4) with respect to the height (h3) of the fitting recess 5. The height is preferably 45% to 85%, particularly preferably 50% to 82%, and even more preferably 55% to 80%. Specifically, it is preferable that they intersect at a height of preferably 1 mm to 27 mm, particularly preferably 2 mm to 13 mm, and even more preferably 3 mm to 5 mm.

The lower inclined surface 51b on the outer side of the lid of the fitting recess 5 is a flat inclined surface inclined to the outer side of the lid in the cross section, and is an angle with respect to the height direction of the fitting recess 5 (θ7 in FIG. 3). Is 0 ° to 30 °, preferably 0 ° to 20 °, particularly preferably more than 0 ° and less than 20 °, and more preferably 2 ° to 10 °.

The upper inclined surface 52b on the outer side of the lid of the fitting recess 5 is a planar inclined surface inclined inward of the lid in the cross section, and is an angle with respect to the height direction of the fitting recess 5 (θ8 in FIG. 3). Is set to 15 ° to 70 °, preferably 20 ° to 50 °, particularly preferably 25 ° to 50 °, and even more preferably 25 to 45 °.
In the present embodiment, the lower inclined surfaces 51a and 51b are formed in an asymmetrical reverse taper shape, but the present invention is not limited to this, and may be formed so as to correspond to the fitting convex portion 4. For example, it may have a symmetrical inverted taper shape.

The tip surface portion 53 is formed in a planar annular shape having a surface width W2 preferably 0.5 mm to 20 mm, particularly preferably 1 mm to 10 mm.
In the present embodiment, the tip surface portion 53 is formed in a horizontal plane shape, but is not limited to this, and is formed in an inclined surface shape or a convex curved surface shape that is inflated upward or a concave curved surface shape that is indented in a cross section. You may.

In the present embodiment, the container body 2 is provided with the fitting convex portion 4 protruding upward, and the lid 3 is provided with the fitting recess 5, but the present invention is not limited to this, and for example, the container body 2 side is provided. It may be projected downward, the container body 2 may be provided with a fitting recess, and the lid 3 may be provided with a fitting protrusion.

In such a packaging container 1a, in order to close the lid 3 to the container body 2, for example, the lid 3 is covered from the upper part of the opening 24 of the container body 2 and fitted inside the fitting recess 5. As shown in FIG. 5, the lid can be closed by pushing the convex portion 4 so that it fits. Further, in order to open the lid 3, for example, the knobs 26 and 33 can be picked and the lids can be opened by pulling each of them in the opposite directions.

The packaging container 1a can suppress the lifting of the lid 3 and prevent the top plate 31 from swelling in the closed state. This is because the length of the upper inclined surface 42a is formed to be longer than that of the upper inclined surface 42b, so that the inner portion of the container of the fitting convex portion 4 is closed over time as shown in FIG. It is presumed that the air inside and outside the container is prevented from being shut off in an instant, the air inside the container is smoothly discharged, the internal pressure inside the container body 2 is lowered, and the lid is easily closed.

Further, by setting the inclination angle (θ2) of the upper inclined surface 42a to be an inclination of 20 ° to 60 ° with respect to the height direction of the fitting convex portion 4, it becomes easier to close the lid.

Further, the lower inclined surface 41a is inclined so that the angle (θ1) of the fitting convex portion 4 with respect to the height direction is 0 ° to 30 °, and the lower inclined surface 41a and the upper inclined surface 42a are fitted. By intersecting the height (h1) of the convex portion 4 inside the container at a height (h2) of 25% to 90%, the convex portion 4 becomes parallel to the height direction of the fitting convex portion 4 and comes off. It becomes a container that is easy to open.

By making the angle (θ2) of the fitting convex portion 4 of the upper inclined surface 42a with respect to the height direction smaller than the angle (θ4) of the upper inclined surface 42b with respect to the height direction, the upper inclined surface The 42b is parallel to the bottom surface portion 21 of the container body 2, and when the fitting concave portion 5 fits into the fitting convex portion 4, the edge portion of the fitting concave portion 5 is expanded, so that the container is expanded. While the outer fitting portion is fitted, the air inside the container body can be released to reduce the internal pressure, which makes it easier to close the lid.

As described above, in the inner / outer fitting structure 1 of the packaging container, the length (L1) of the upper inclined surface 42a located inside the container of the fitting convex portion 4 is set to the upper portion located outside the container of the fitting convex portion 4. By making the inclined surface 42b longer than the length (L2), the lid can be closed without increasing the internal pressure inside the container while ensuring the airtightness. Therefore, the inner / outer fitting structure 1 is suitable for a container for packaging foods such as lunch boxes, vegetables, fruits, and prepared foods, in which juice easily exudes.

The configuration of the above embodiment is not mentioned as limiting the present invention, and can be changed as long as the technical object is common, and the present invention includes such a change. For example, a so-called food pack in which the container body 2 and the lid 3 are integrally formed by a hinge or the like is naturally included.

1 Inner / outer fitting structure of the packaging container 1a Packaging container 2 Container body 21 Bottom part 22 Peripheral wall part 23 Accommodating part 24 Opening 25 Flange part 26 Grip part 3 Lid 31 Top plate part 32 Flute 33 Grip part 4 Fitting Convex portions 41a, 41b Lower inclined surface 42a, 42b Upper inclined surface 43 Tip surface portion 5 Fitting recesses 51a, 51b Lower inclined surface 52a, 52b Upper inclined surface 53 Tip surface portion 54 opening

Claims (4)

In the inner / outer fitting structure of the packaging container that fits the container body and the lid,
It is provided with a fitting convex portion provided on either one of the container body and the lid, and a fitting concave portion provided on either the container main body or the lid and which can be fitted to the fitting convex portion.
The fitting convex portion and the fitting concave portion are provided with a reverse tapered lower inclined surface on the base end side and a tapered upper inclined surface on the tip end side in a cross section, and the fitting convex portion and the fitting concave portion are provided. The structure is such that the lower inclined surfaces of the container overlap each other to prevent the lid from coming off the container body.
The length of the upper inclined surface located inside the container of the fitting convex portion at the inner and outer fitting points is made longer than the length of the upper inclined surface located outside the container of the fitting convex portion, and the fitting convex portion is formed. The height of the lower inclined surface located inside the container is made lower than the height of the lower inclined surface located outside the container of the fitting convex portion, and the upper inclined surface located inside the container of the fitting convex portion is fitted. An inner / outer fitting structure of a packaging container characterized by having an inclination of 20 ° to 60 ° with respect to the height direction of the convex portion . The lower inclined surface located inside the container of the fitting convex portion shall be inclined at 0 ° to 30 ° with respect to the height direction of the fitting convex portion.
The lower inclined surface and the upper inclined surface located inside the container of the fitting convex portion intersect at a height of 25% to 90% with respect to the height of the inside of the container of the fitting convex portion.
The internal / external fitting structure for a packaging container according to claim 1 , wherein the packaging container is characterized by the above. The angle of the upper inclined surface of the fitting convex portion located inside the container with respect to the height direction of the fitting convex portion with respect to the height direction of the upper inclined surface located outside the container of the fitting convex portion. The internal / external fitting structure for a packaging container according to claim 1 or 2 , wherein the angle is smaller than the angle. A packaging container having the internal / external fitting structure according to any one of claims 1 to 3 .

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