JP2001139045A - Lid of packaging container formed of sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lid body to be internally fitted to a container body which can heighten the tight adhesiveness to a flange part on the container body side by increasing the rigidity of the flange part on the lid body side, be easily attached/detached as a result since it is formed of a thin synthetic resin sheet, and improve the appearance of the container. SOLUTION: The flange part 12a of the lid body 12 is flat so as to be abutted on an upper surface of the flange part 11a on the container body 11 side, and a hollow projecting bar 13 is integratedly formed with a portion of the flange part 12a of the lid body 12 overlapping the flange part 11a on the container body 11 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging container having a lid fitted inside a container body, and more particularly to a packaging container in which both are formed into a sheet.

[0002]

2. Description of the Related Art In recent years, side dishes such as fries, salads, and boiled foods sold in supermarkets and convenience stores have been increasingly stored in so-called packaging containers. Such a packaging container is formed as a product having a predetermined depth or height by molding a synthetic resin sheet. The number of lids is increasing.

[0003] The fitting of the lid to the container body is roughly classified into "inner fitting" and "outer fitting". In the inner fitting, a part of the lid is fitted inside the opening of the container body. In the outer fitting, the lid is fitted outside the outer peripheral edge of the container body.
Since the inner fitting is performed inside the flange portion to partition the contents, the shape and size of the flange portion can be made smaller than those of the outer fitting, so that the overall shape can be refreshed. This is an advantage that can be exhibited.

However, when this kind of packaging container is used as an inner fitting container by sheet molding, it is very difficult to make the flange portion of the lid abut on the container body side. Because the synthetic resin sheet itself is formed very thin in order to reduce the cost of the container and to facilitate sheet molding, it is difficult to make the flange of the inner fitting container rigid. It is. Looking at the flange portion of the lid, the dimensional error during molding, shrinkage of the synthetic resin sheet, or the dimensional error between the size of the fitting portion on the container body side and that of the lid body side may cause the flange portion on the container body side. It was often seen to float from the ground.

For this reason, conventionally, for example,
No.-49716 discloses a "deformation-resistant container in which an annular projection is provided on the entire lower surface of a flange portion of a mouth portion forming a container". According to the description in the specification of the corresponding application in the above publication, the “annular projection” is formed by the “injection molding method is most suitable, and in addition, the projection is formed by compression molding”. is there.

However, the "injection molding system" and the "compression molding system" described in the above-mentioned publications.
Cannot be applied to those formed into sheets. This is because sheet molding is performed while a thin synthetic resin sheet is stretched by a mold, so that not only “injection” but also “compression” cannot be performed.
Further, since the "projections" described in the above publication are formed in a state of protruding in the length direction on the back side of the flange of the container main body, it is considered that sufficient sealing properties cannot be obtained. .

In particular, when a packaging container is formed by sheet molding, the inner fitting is easily disengaged unless the flange portion of the inner fitting lid is allowed to completely abut against the container body side. In addition to the risk of wrapping the entire packaging container, there is a risk that the wrap may be broken, and it is necessary to ensure that the flange of the lid can sufficiently contact the container body. Is very important. In addition, it is necessary to ensure this adhesion by sheet molding.

[0008] In view of the above, the inventors of the present invention have proposed that when the lid of the packaging container to be formed into a sheet is fitted into the container main body, the flange of the lid comes into contact with that of the container main body. As a result of various studies on what to do, the present invention was completed.

[0009]

SUMMARY OF THE INVENTION The present invention has been made based on the above circumstances, and an object of the present invention is to ensure that the flange portion of the lid to be fitted into the inner wall of the lid is securely brought into contact with that of the container body. It is to make contact.

That is, an object of the first aspect of the present invention is to increase the rigidity of the flange portion of the lid body fitted inside the container body and to adhere the flange portion to the container body side flange portion. It is an object of the present invention to provide a lid that can enhance fitting properties and can easily be fitted and removed as a result, even if molded from a thin synthetic resin sheet, and can improve the appearance. .

An object of the present invention according to claim 2 is to achieve the same object as in claim 1 and to facilitate the manufacture of a substantially rectangular shape. To provide a cover that can be used.

[0012]

Means for Solving the Problems In order to solve the above problems, means according to the first aspect of the invention will be described with reference numerals used in the embodiments described below. A lid 12 formed into a sheet so as to be fitted into a container body 11 which is formed and constitutes the packaging container 10.
The flange 12a of the lid 12 is made flat so as to be in contact with the upper surface of the flange 11a on the container body 11, and the flange 12a of the lid 12 on the side of the container 11 is formed. A lid 12 of a sheet-shaped packaging container 10 ", wherein a hollow ridge 13 is integrally formed in a portion overlapping with the lid 11a.

That is, the lid 12 according to claim 1 is entirely formed from a synthetic resin sheet into a sheet, and the lid-side inner fitting portion 16 is used to form a sheet on the container body 11 side. It is fitted into the main body side inner fitting portion 15 to form an integral packaging container 10 as shown in FIG. The inner fitting here is the inner fitting part 1 on the lid side.
6. The outside of the inner body 6 and the inside of the main body side inner fitting portion 15 are made substantially the same size, or the lid 12 is slightly enlarged, and the lid 12 is forcibly fitted to the container main body 11. It is.

The flange 12a of the lid 12
1 is formed on the entire outer periphery of the lid 12 as shown in FIGS. 1 and 2, and at the time of sheet forming, as shown in FIG.
1a is cut out so as to be substantially the same as that of 1a, and is formed as a flat shape except for a hollow ridge 13 described later. If the flange portion 12a of the lid 12 is flat, "wrinkles" may occur due to molding errors during sheet molding and uneven heat of the mold. Does not.

That is, the flange 12 of the lid 12
At the approximate center of a, as shown in FIG. 2, an upwardly projecting hollow ridge 13 is simultaneously formed by a mold when the cover 12 is formed into a sheet. The rigidity of the entire flange portion 12a of the lid 12 is increased, and the rigidity of the hollow ridge 13 maintains the flatness of the flange portion 12a. As a result, as shown in FIG. That is, it can come into contact with any part on the part 11a.

In general, in sheet molding, a dimensional error is likely to occur due to a difference in accuracy of a mold, a difference in shrinkage of a product, and the like, and as a result, a floating phenomenon occurs with respect to one another. However, in the present invention, the presence of the hollow ridge 13 causes the flange portion 12 a of the lid 12, particularly the flange portion 11 a on the container body 11 side.
, That is, the rigidity in the vertical direction is increased. Therefore, due to the rigidity of the hollow ridge 13,
The flange portion 12a on the lid 12 side maintains the flatness with respect to the flange portion 11a on the container body 11 side,
As a result, the flange portion 12 on the lid 12 side according to the present invention
"a" can be in contact with any part on the flange portion 11a on the container body 11 side.

The hollow ridge 13 can be easily formed by forming a thin synthetic resin sheet into a sheet. In particular, the sheet can be easily formed by a female mold that is recessed in the direction in which the hollow ridge 13 protrudes. It has become something.

As described above, the lid 1 according to claim 1
2 is that the flange portion 12a, whose rigidity is ensured by the hollow ridge 13, comes into complete contact with the flange portion 11a on the container body 11 side. In addition, only a small gap is formed between the flange portion 12a of the lid 12 which is internally fitted by the lid-side inner fitting portion 16 and the flange portion 11a of the container main body 11 side. For this reason, both flange portions 11a and 1
The foreign matter may be mixed into the container main body 11 from 2a because the lid 12 is fitted into the container main body 11 in some cases.
It is completely prevented.

There is no gap or wrinkle between the flange portions 11a and 12a.
Since the outer peripheral edge of the package 2a is substantially coincident with each other, the packaging container 10 has a clean appearance as a whole when the packaging container 10 is formed.
The wrap 20 is not damaged when the wrap is applied. This is because there is no sharp portion on the outer peripheral edge of the packaging container 10 that may damage the wrap 20.

Of course, a hollow ridge 13 is formed on the flange portion 12a on the lid 12 side.
As shown in FIG. 2 or FIG. 5, since the projection is formed in an arc shape, it does not become a catching portion that breaks the wrap 20. Conversely, the hollow ridge 13 covers the entire packaging container 10. It can be used as a hook for fingers when held by hand, and rather improves stability when held.

The wrap 20 of the packaging container 10 as described above
When the lid 12 is removed from the container body 11 this time, the flanges 11a and 12a have the same outer shape and overlap with each other. The operation of turning the page can open the space between the flange portions 11a and 12a. For this reason, the lid 12 of this claim 1 is
It can be easily removed from the device.

Therefore, the rigidity of the flange portion 12a is sufficiently ensured by the hollow ridge 13 even when the lid 12 is formed from a thin synthetic resin sheet. Thereby, the inner fitting can be ensured, and can be easily removed. Moreover, both flange portions 11a and 12
Since the outer edges of “a” are substantially coincident with each other, they also have a neat beauty.

In order to solve the above-mentioned problem, a means adopted by the invention according to claim 2 is that the lid 12 according to claim 1 is described as “the lid 12 has a substantially rectangular shape and the hollow ridge 1
3 is formed on at least one of the long sides of the flange portion 12a. "

That is, the lid 12 according to claim 2
Is a rectangular shape as shown in FIG. 1, and has a hollow ridge 13 formed on at least one of its long sides as shown in FIG. 3 or FIG. The four corners 14 are provided with cuts of the hollow ridge 13.

In this case, for example, the lid 12 shown in FIG.
Although it seems that the rigidity of the flange portion 12a of the short side portion is insufficient and the adhesion to the flange portion 11a on the container body 11 side cannot be sufficiently ensured, the short side portion in the case where the overall shape is substantially rectangular. Adhesion is sufficiently ensured by the lid 12 having a rectangular shape.

Further, since the hollow ridge 13 is formed at least on the long side of the lid 12, that is, the hollow ridge 13 is not present at each corner 14, rigidity at each corner 14 is reduced. However, this does not impair the adhesiveness of each corner 14 to the corner 14 on the container body 11 side. This is because the rigidity is sufficiently secured as a result of the substantially rectangular shape of the lid 12 and the hollow ridges 13 on the long side.

In addition, the absence of the hollow ridge 13 at each corner 14 reduces the rigidity at each corner 14, and the lid 1
This means that the operability when lifting up and removing 2 can be improved, and the packaging container 10 with good operability can be obtained.

Therefore, the lid 12 according to claim 2 is
Not only can the same function and effect as those of the above-mentioned claim 1 be exhibited, but also the production including the formation of the mold can be easily performed, since the hollow ridge 13 can be formed at least on the long side. It is possible to have good operability.

[0029]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a lid body according to an embodiment of the present invention; FIG. The container 12 for packaging is formed by internally fitting a lid 12 having substantially the same peripheral edge.
A plan view when 0 is set is shown. This lid 12 is
Although formed separately from the container main body 11, the present invention is applicable to a lid of a packaging container of a type in which the lid 12 and the container main body 11 are connected by a hinge. Needless to say.

The container body 11 is formed from a synthetic resin sheet and has a flat flange portion 11a formed on the outer peripheral edge thereof as shown in FIG. A main body side inner fitting portion 15 to which the lid body side inner fitting portion 16 is forcibly fitted from above is formed below the inside. Further, as shown in FIG. 5, the flange portion 11a on the container body 11 side is, as shown in FIG.
A hanging portion 11b that hangs obliquely downward from the outer peripheral edge may be formed, but in both cases of FIGS. 2 and 5, the sheet is formed and then punched out.

The lid 12 is to be fitted inside the container body 11 described above. In the present embodiment, a sheet made of polyethylene terephthalate having a thickness of 0.5 mm and a shrinkage of 4/1000 is used. Is used to form a sheet. In particular, the outer peripheral edge portion has a shape as shown in FIG. 2 or FIG. The material sheet for the lid 12 may be biaxially oriented polystyrene having a shrinkage of 5/1000. Further, a polypropylene sheet having a contraction rate of 12/1000 or a sheet obtained by adding an inorganic substance to polypropylene may be employed as the material of the container body 11.
The container body 11 and the lid 12 may be formed by using a sheet made of different sheet materials.

The outer peripheral edge of the lid 12 has a flange 12
a is integrally formed, and the flange portion 12a has a flat shape and an outer shape substantially the same as the outer shape of the flange portion 11a on the container body 11 side. Further, the flange portion 12a of the lid body 12 is integrally formed with a hollow ridge 13 having a sectional shape as shown in FIG. 2 or FIG. In other words, the hollow ridge 13 is literally hollow, which is a natural result of sheet molding. In addition, the shape of the hollow ridge 13 may be elliptical in cross section or may be wavy as viewed in plan. Further, the hollow ridges 13 are not limited to being continuous, and may be implemented as being separated into a large number and continuous in a linear or wavy shape.

The flange portion 12a of the lid 12 is required to substantially match the outer shape of the flange portion 11a on the container body 11, and the flange portion 11a on the container body 11 is as shown in FIG. Simple shape,
The flange portion 12a also has a simple shape corresponding thereto.

On the other hand, the flange portion 11a on the container body 11 side
In the case shown in FIG. 5 in which the hanging portion 11b is integrally formed with the outer end of the cover 12, the flange portion 12a on the lid 12 side is also provided with the protruding portion 12b so as to completely cover the hanging portion 11b from above.
Is formed. This protrusion 12b
Since the wrap 20 is freely bent on the hanging portion 11b on the container body 11 side, when the wrap 20 is applied to the entire packaging container 10, the protruding portion 12b bends as shown by a two-dot chain line in FIG. As a result, not only is the wrap 20 prevented from being damaged, but if the wrap 20 is removed, the wrap 20 returns to its original position.
2 can be easily removed.

Now, with respect to each corner portion 14, as shown in FIG.
2 may be formed so as to be formed only on the long side portion, or may be formed with a gap between the long side portion and the short side portion as shown in FIG. As a matter of course, as shown in FIG. 1, the cover 12 may be formed on the entire periphery of the flange portion 12a.

As shown in FIGS. 2 and 5, the lid 12 has a body-side inner fitting portion 15 forced by the lid-side inner fitting portion 16 inside the flange portion 12a. The packing container 10 is formed integrally with each other by the mutual fitting of the main body side inner fitting portion 15 and the lid body side inner fitting portion 16.
The contents of the inside are prevented from leaking out, and the lid 12 can be surely integrated with the container body 11.

[0037]

As described in detail above, in the first aspect of the present invention, as described in the above embodiment, "the sheet is molded into the container body 11 constituting the packaging container 10". The lid 12 is formed into a sheet, and the flange 12a of the lid 12 is made flat so as to be in contact with the upper surface of the flange 11a on the container body 11 side. The hollow ridge 13 is integrally formed in a portion overlapping with the flange portion 11a on the container body 11 side ". With respect to the body 12, the rigidity of the flange portion 12a is increased to increase the
Adhesion to the one-side flange portion 11a can be enhanced, and even if molded from a thin synthetic resin sheet,
As a result, mating and unmating can be performed easily,
It is possible to provide the lid 12 that can improve the aesthetic appearance.

The lid 12 of the second aspect is the same as the lid 12 of the first aspect, except that the lid 12 has a substantially rectangular shape, and the hollow ridge 13 has at least one length of the flange portion 12a. Formed on the side portion "has a structural feature, thereby achieving the same object as the above-mentioned claim 1, and making it easy to manufacture, especially for a substantially rectangular shape. It is possible to provide a cover that can be used.

[Brief description of the drawings]

FIG. 1 is a plan view when a lid of the present invention is internally fitted into a container body to form a packaging container.

FIG. 2 is an enlarged partial cross-sectional view showing a main part of the packaging container of FIG. 1;

FIG. 3 is a plan view showing another embodiment of the lid of the present invention.

FIG. 4 is a plan view showing still another embodiment of the lid.

FIG. 5 is a partially enlarged cross-sectional view showing a container main body having a hanging portion and a lid having a protruding portion corresponding thereto.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Packaging container 11 Container main body 11a Flange part 11b Hanging part 12 Lid 12a Flange part 12b Projection part 13 Hollow ridge 14 Corner part 15 Main body side fitting part 16 Lid side fitting part 20 Wrap

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 3E033 AA10 BA13 BA16 BA22 DA02 EA01 FA01 GA03 3E067 AA11 AB01 BA10A BB14A BB16A BC07A EA17 EA32 EE39 3E084 AA05 AA13 AA24 AB10 BA01 CA01 EA10 EB03 EC03 FA09 GA08

Claims (2)

[Claims] 1. A lid formed into a sheet and formed into a sheet so as to be fitted into a container main body constituting a packaging container, wherein a flange portion of the lid is formed on an upper surface of a flange portion on the container main body side. A sheet-shaped package, wherein a hollow ridge is formed integrally with a flange portion of the lid, which overlaps with the flange portion on the container body side, while being flat so as to be capable of contacting the package. Cover for container. 2. The molded sheet according to claim 1, wherein the lid is substantially rectangular, and the hollow ridge is formed on at least one long side of the flange portion. Lid for packaging container.