JPH10310124A - Packaging container for food - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging container which can sufficiently bring out such a merit that it can be molded with foaming beads and obtain a sufficient gas-barrier property and give a gentle feeling to us when we holds it with hands and contain and preserve so-called uncooked food for a lone time. SOLUTION: In this packaging container for food, a decoration film 12 is integrally formed on the whole face of at least one side face of the external side faces or the inside faces of a container body 11 molded with foaming beads. The decoration film 12 is formed of a base material film 12a excellent in the gas-barrier property having 50-120 μm thickness and an adhesive layer 12b formed at the rear face side thereof in advance to soften at 120-140 deg.C. The adhesive layer 12b of the decoration film 12 penetrates into the rugged face 20 of the surface of the container body 11 and the surface of the decoration film 12 becomes flat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging container and, more particularly, to a packaging container in which a container body is formed of a foamable resin for a food to be eaten by adding hot water. .

[0002]

2. Description of the Related Art Food such as instant noodles and instant miso soup is prepared by drying or concentrating noodles and utensils in a packaging container, and adding hot water to a container body which also serves as tableware. is there. And, in order to make it cheap and sanitary, and to suppress heat conduction when hot water is added, the container body of this packaging container must have a deep cup shape. Also,
It must be formed of a foamable synthetic resin.

In order to form a cup-shaped container body of this type of packaging container with a foamable synthetic resin, a small granular resin material called foam beads is placed in a mold having a cavity having the same shape as the container body. In general, heating is performed by filling, for example, by passing steam through a mold, and foaming the foaming agent in the foamed beads to form the foamed beads. For this reason, even if the inner surface of the mold is smoothed, small irregularities which can be said to be "traces" of small and granular foamable resin individually foamed remain on the surface of the container body completed from the foamable resin. Will be. The irregularities on the surface of the container body are effective in softening the conduction of heat to fingers, etc., but are obstacles to printing on the surface, and should be eliminated by some method if possible. It is.

For this reason, for example, Japanese Patent Application Laid-Open No. 4-331132
As described in Japanese Patent Application Laid-Open Publication No. H10-260, "painting a pattern on a plastic container main body, especially a foam molded container main body, without causing deformation of the container itself, and without distortion. For the purpose of providing a method that can obtain a clear print painting, `` a core paper has a printing layer on the outer surface, a heat seal layer on the inner surface thereof, and is formed in a predetermined cylindrical shape. Setting the printed paper sheet in the cavity of the female mold of the mold, and matching the male mold to the female mold, and printing the male core in the cavity of the female mold and the tubular paper. The process of positioning it inside the seat,
A step of filling foamed resin beads between a printing sheet made of tubular paper and a male mold core and a predetermined portion in a cavity of a female mold and performing heat foaming fusion molding.

However, in the conventional painting method, it is necessary to form and prepare a "paper-made printing sheet having a heat seal layer on the inner surface and formed in a predetermined tubular shape", which is expensive. It has become a packaging container and cannot be adopted as a packaging container for disposable foods.

Further, since the container body made of a foaming resin is formed by individually foaming small granular foaming resins, the gas is easily transmitted through gas such as water vapor and air. It has very low so-called "gas barrier properties" and high moisture permeability. As described above, since the “gas barrier property” is extremely low and the moisture permeability is high, it means that water vapor or the like easily enters the inside of the container. Even if "dried (dry) food" is stored, it cannot be stored for a long period of time, and the flavor of the food may be significantly deteriorated by moisture.

In order to enhance the "gas barrier property", it is sufficient to use a non-foamable ordinary synthetic resin as a material without using a foamable resin. If the container body is to be molded, the injection molding method must be employed, resulting in a very expensive packaging container. Since packaging containers for this type of food are disposable, the fact that they are expensive means that they cannot be adopted. Is considered to be unsuitable for actual use because the thermal conductivity of the part touching the finger when held in the hand is increased.

As one method for improving the “gas barrier property”, for example, a method such as “a method for producing a resin foam molded article having a decorative surface layer” disclosed in Japanese Patent Publication No. 6-104338 can be considered. This manufacturing method is described as follows. “Using a steam introduction chamber of a mold, a blank is evacuated and held on one inner wall surface of a mold, and a surface decorative layer is formed on a molded resin foam. For the purpose of producing a good-looking product in which the blank fits correctly, the blank that becomes the surface decorative layer of the molded product is composed of a female mold and a male mold each with a steam introduction hole. After the pre-foamed resin beads are filled in the cavity formed by clamping both the male and female molds, and then mounted in the other mold or the chamber of the male and female molds. The foam is formed by heating the beads and fusing the beads together with the steam to form a foam, and at the same time, a resin foam having a surface decorative layer in which the blank is integrally fused on the foam. In the method of molding a molded article, the blank is vacuum-evacuated through the steam introduction hole by depressurizing the chamber of one mold, and the blank which has been suction-bonded to the mold wall surface by the evacuation action is filled with a pre-foam resin Until the filling of the beads is completed, it is placed under vacuum evacuation ", but it has the following difficulties.

That is, in the method of manufacturing a resin foam molded article proposed in Japanese Patent Publication No. 6-104338,
By making the `` blank that becomes the surface decorative layer of the molded article '' excellent in gas barrier properties, it is possible to compensate for the lack of gas barrier properties of the foamed resin molded articles,
By placing the blank under vacuum until the filling of the pre-foamed resin beads into the cavity is completed, the blank is integrally fused onto the foam, so that the foam It is considered that the integration by fusion with the blank is not sufficient. Because the surface of the container body made of foamable resin has small irregularities that can be said to be "traces" in which small granular foamable resin is individually foamed, it is impossible to secure a perfect adhesive surface Because.

Regarding the gas barrier property, the painting method according to the conventional claim 1 proposed in the above-mentioned Japanese Patent Application Laid-Open No. 4-331132 discloses that "a heat seal layer is provided on the inner surface and a predetermined With a “paper-made printing sheet formed in a tubular shape”, sufficient gas barrier properties cannot be ensured. Then, the above-mentioned Japanese Patent Laid-Open No.
Also in the painting method according to the second aspect of the present invention, in order to form a printed picture or the like without distortion, it is necessary to provide a structure in which gas generated during foam molding is discharged through gas vent holes formed on the entire surface of the sheet. .

[0011] Further, it is thought that if the surface smoothness of this type of foamed resin molded article can be improved, it can be finished to a good touch and beautiful. In order to achieve this, for example, Japanese Unexamined Patent Publication No. Hei 8-132465 has adopted "a foamed resin molded article with a label and a method for producing the same".

[0012] In the "foamed resin molded article with label and the method of manufacturing the same" proposed in Japanese Patent Application Laid-Open No. 8-132465, according to claim 1 of the claims, a female mold cavity is provided. A “groove along the label edge” is formed on the inner surface, and the “groove along the label edge”
Then, the air is sucked from the container to reduce the pressure between the female mold and the label, thereby temporarily fixing the label to the female mold. The formation of the "groove along the label end" is the same in the manufacturing method using the pseudo male mold according to the second aspect of the present invention.

However, in order to ensure that the label is temporarily fixed by sucking air from the “groove along the label end” formed on the inner surface of the female cavity, the label must be formed in the “groove along the label end”. Must be in a position where it can abut
The positioning of the label relative to the female, male, or pseudo-male must always be accurate. If the label position is not set correctly, the decompression between the female mold and the label will not be good, not only will the label not be able to be temporarily fixed to the female mold, but also the label will be integrated with the container surface with the misalignment It will be done. Therefore, the finished product not only has poor appearance, but also does not have sufficient gas barrier properties. The position setting of the label with respect to the female type, the male type, or the pseudo male type is not specifically described in the above publication, but in order to obtain a beautiful product having sufficient gas barrier properties. Is actually a very important issue.

Although this type of disposable foamed resin molded article must be mass-produced at a high speed, it takes time to set the position of the label with respect to the female, male, or pseudo male type. If it is troublesome or troublesome, the cost will naturally increase, which is not preferable. In particular, if it takes time to set the position of the label, there is a serious problem in the method of manufacturing such a foamed resin molded product.

Therefore, the present inventors have considered that a cup-shaped packaging container has a high gas barrier property while taking full advantage of the fact that the container body is formed of an expandable synthetic resin, and is also concerned with irregularities on the surface of the container body. Various studies have been made on how to make a packaging container with beautiful decoration such as printing, and as a result, the present invention has been completed.

[0016]

SUMMARY OF THE INVENTION The present invention has been made based on the above circumstances, and an object of the present invention is to provide a packaging container having a high gas barrier property and a beautiful decoration such as printing. .

That is, first, the object of the invention according to claim 1 is to make full use of the merits of forming by foaming bead molding, and also to achieve sufficient "gas barrier properties". Another object of the present invention is to provide a packaging container that can have an excellent feel when held in a hand and can store and store so-called “raw” for a long period of time.

Another object of the invention according to claim 2 is to make full use of the advantages of forming by foamed bead molding and to easily perform positioning of a decorative film with respect to a mold. While providing a decorative film capable of satisfactorily discharging gas generated during foam molding, positioning and position correction of the decorative film with respect to a molding die can be automatically and easily performed, and sufficient "gas barrier property" is provided. It is possible to provide a packaging container which can have an excellent feel when held in a hand and can store and store so-called "raw" for a long period of time. is there.

The object of the invention according to claim 3 is to achieve the same object as that of the invention of claim 1 or claim 2, and to achieve the "gas barrier property".
The object of the invention according to claim 4 is to provide a packaging container that can make the container more effective, similar to any one of claims 1 to 3 above. It is another object of the present invention to provide a packaging container having a very beautiful decoration on the surface, in addition to achieving a special purpose.

[0020]

Means for Solving the Problems In order to solve the above problems, first, means adopted by the invention according to claim 1 will be described with reference numerals used in the description of the embodiments described below. "A packaging container 10 for food, in which a decorative film 12 is integrally formed on at least one of the outer surface 11a and the inner surface 11b of the container body 11 formed by foaming bead molding. A decorative film 12 before being integrated with a base film 12 having a high gas barrier property and a thickness of 50 to 120 microns.
a and 120 ° C. to 140 ° C. previously formed on the back side
And the adhesive layer 12b of the decorative film 12 penetrates into the irregularities 20 on the surface of the container body 11, and the surface of the decorative film 12 becomes smooth. And a packaging container 10 for food.

That is, in the packaging container 10 according to the first aspect, the decorative film 12 is integrally attached to, for example, at least the outer surface 11a of the container body 11 made of a foamable synthetic resin. However, the adhesive layer 12b constituting the decorative film 12 compensates for the irregularities 20 on the surface of the container body 11, so to speak, so that the surface of the decorative film 12 can be sufficiently covered. That is, it has smoothness. In addition, in the packaging container 10 according to the present invention, the gas barrier property of the container body 11 is sufficiently ensured by the base film 12a that forms the decorative film 12 and does not change at all after the integration.

Here, the decorative film 12 must be formed integrally with at least one of the outer side surface 11a and the inner side surface 11b of the container body 11 formed of a foamable resin. This is because the decorative film 12 secures the gas barrier property of the container main body 11 by this, and therefore, it is necessary to cover a portion of the container main body 11 having as large an area as possible with the decorative film 12. In other words, the decorative film 12 is not only integrated with the outer surface 11a of the container body 11 as exemplified in the embodiment described later, but also integrated with the surface of the inner surface 11b of the container body 11. Is also good.

As shown in FIG. 5, for example, the decorative film 12 before being integrated with the container body 11 includes a base film 12a and an adhesive layer 12 formed on the back side thereof.
b must be formed. By doing so, the decorative film 12 before being integrated with the container main body 11 can be made flat, and its manufacture can be easily performed. This is because the loading into the mold for the packaging container 10 can be easily performed.

The base film 12a constituting the decorative film 12 needs to have a high gas barrier property and a thickness of 50 to 120 microns. The reason is,
Since the base film 12a covers the surface of the completed container body 11 and secures its gas barrier property, it needs to have a thickness of at least 50 microns, and conversely, even if it is thicker than 120 microns, Packaging container 1
Not only is it difficult to handle during molding of 0, but also 5
This is because the gas barrier property of the base film 12a is not so much improved as compared with the case of about 0 μm. In the case of the example shown in FIG. 5 in which the base film 12a was formed of stretched polypropylene, the thickness of the base film 12a was about 60 microns.

Further, the adhesive layer 12b constituting the decorative film 12 needs to be softened at a temperature of 120 ° C. to 140 ° C. The reason is that when the container body 11 is molded with the foaming synthetic resin, the decorative film 12 is integrated with the surface of the container body 11 by using the adhesive layer 12b.
This is because the temperature is from about ℃ to 160 ℃, the adhesive layer 12b must be sufficiently softened before foaming of the expandable synthetic resin is completed, so that the adhesive layer 12b can be sufficiently bonded to the container body 11 side. . Moreover, the softened adhesive layer 12b
Is filled in the uneven portion 20 formed on the container body 11 and fills the uneven portion 20. Therefore, before foaming of the expandable synthetic resin is completed, that is, 120 ° C. to 140 ° C.
It is necessary that the material softens at a temperature of ° C.
In that sense, the thickness of the adhesive layer 12b is
40 microns (20-30 g / m in terms of applied solid content)
^{About 2} ).

When the decorative film 12 configured as described above is used, a foaming synthetic resin is foamed in a mold by a conventional and generally used molding means.
The packaging container 10 according to the present invention is easily manufactured. That is, the packaging container 10 according to the present invention can be manufactured while fully utilizing the advantage of molding the conventional container body with the expandable synthetic resin.

The packaging container 10 according to the present invention comprises:
Since the sufficient gas barrier property can be ensured by the presence of the decorative film 12, the packaging container 10 can be used to store salads such as fresh vegetables, etc., but also to store noodles and utensils without drying. This makes it possible to omit the packaging of instant foods to be added with boiling water and to provide instant foods at low cost.

In order to solve the above problems, means adopted by the invention according to claim 2 will be described with reference numerals used in the description of embodiments described below. Packaging container 1 for food in which decorative film 12 is integrally formed on at least one of the outer side surface 11a and inner side surface 11b of container body 11
0, the decorative film 12 before being integrated with the container body 11 is made of a base film 12 a having a high gas barrier property and a thickness of 50 to 120 μm, and a base film 12 a formed in advance on the back surface side at 120 ° C. A food product characterized in that it is formed by an adhesive layer 12b that softens at a temperature of 140 ° C., and that the adhesive layer 12b is previously formed in a grid shape on the back side of the base film 12a. For packaging 10 ".

That is, the packaging container 10 for food according to the second aspect is basically the same as the packaging container 10 of the first aspect, but before being integrated into the container body 11. The difference is that the adhesive layer 12b formed on the back surface of the decorative film 12 is previously formed in a grid shape.
b, the packaging container 10 is made of a container body 11
It was integrated at the correct position.

Thus, the packaging container 1 according to claim 2 is provided.
The reason why the decorative film 12 was integrated with the container main body 11 at the correct position at 0 is as follows. That is, in the manufacturing process of the packaging container 10,
Beads are injected into gaps in the cavity of the mold, and the beads are heated and foamed by steam introduced from a plurality of steam introduction holes, thereby forming the container body 11.
At this time, the gas existing in the gap in the cavity and the gas generated at the time of foam molding are transferred between the adhesive layers 12b provided in a grid on the back surface of the decorative film 12, as shown in FIGS. This is because the decorative film 12 moves as shown in FIG. 8 and the position of the decorative film 12 is automatically corrected, so to speak.

For this purpose, as shown in the enlarged view of FIG. 6, an adhesive layer 12b is previously formed in a grid on the back surface of the decorative film 12, and the space between these adhesive layers 12b is formed. The gas existing in the gap in the cavity flows as indicated by the arrows in FIGS. 6 and 7 due to the volume increase due to the injection of beads into the cavity and the heat foaming of the beads. In other words, since the decorative film 12 is also for ensuring the gas barrier property of the container body 11, the gas is
2 does not pass through, and the gas existing in the gap in the cavity is forced to flow between the grids of the adhesive layer 12b on the back surface of the decorative film 12. . As described above, the gas flow on the back surface of the decorative film 12 and between the adhesive layers 12b is
As a result, the flow finally becomes a large flow as shown by the arrow in FIG. 7 and serves as a power source for correcting the position of the decorative film 12.

In order to solve the above-mentioned problem, a means adopted by the invention according to claim 3 is that the decorative film 12 of the packaging container 10 according to claim 1 or 2 is provided by the following: It also covers the bottom surface 11b. "

That is, in the packaging container 10 according to the third aspect, since the decorative film 12 also covers the bottom surface 11b of the container body 11, at least one of the outer surface 11a and the inner surface 11b of the container body 11 is provided. The gas barrier property of the container body 11 is almost completely secured by cooperation with the portion covering the entire side surface surface of the container body 11.

[0034] In order to solve the above-mentioned problem, a means adopted by the invention according to claim 3 is that the packaging container 10 according to claim 1 or 3 is described as “decorative film 1”.
2 has a predetermined print 30 on its surface. "

That is, in the packaging container 10 according to the fourth aspect, since the printing 30 such as various patterns is performed on the surface of the base film 12a on the front surface side, the gas barrier property is merely obtained. Not only is secured, but the print 30 makes it more beautiful. Of course, the print 30 is easily printed on the surface of the base film 12a having a thickness of 50 to 120 microns.

[0036]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a packaging container according to an embodiment of the present invention; FIG. Since the present invention substantially includes the inventions according to the above-mentioned claims, the following description will be made focusing on the packaging container 10 according to this embodiment.

FIG. 1 shows a completed packaging container 1.
0 is shown in FIG.
(A), the decorative film 1 is formed on the entire outer surface 11a of the container body 11 formed of a foamable resin.
2 are integrally formed. Of course, as shown in FIG.
As described above, it may be formed integrally with the entire inner surface 11b surface. This decorative film 1
As shown in FIGS. 4A and 4B, 2 may be formed on the lower surface or the inner surface of the bottom surface 11c of the container main body 11 and implemented.

The container body 11 is filled with a foaming synthetic resin, which is a pre-foamed small particle, in a cavity of a molding die and is heated with steam to obtain a predetermined foaming rate as shown in FIG. It was formed by foaming into the shape as shown. In the container body 11 of the present embodiment, as shown in FIGS. 1 and 3, a thread end 13 is formed on the lower surface of the bottom surface 11 c, and the heat inside the container body 11 is conducted by the thread end 13. At the same time, a seal-attached flange 14 is formed at the upper end of the seal-attached flange 14 so that a seal-like lid can be attached to the seal-attached flange 14.

In the packaging container 10, as shown in FIGS. 1 and 2, the outer surface 11a of the container body 11 is provided.
The decorative film 12 is integrally formed on the entire surface. Before the decorative film 12 is integrated with the container body 11, the decorative film 12 has a high gas barrier property and a thickness of 50 to 120 microns. The film 12a was formed by a film 12a and an adhesive layer 12b formed in advance on the back side and softened at a temperature of 120C to 140C.

As a material of the base film 12a, OPP (stretched polypropylene) is employed in order to make the gas barrier property sufficient, but its thickness is easy to handle and easy to form the print 30. Considering the above, 50-1
It needs to be 20 microns. The material of the adhesive layer 12b is a hot-melt adhesive, and a mixture of (paraffin wax / ethylene-vinyl acetate copolymer / adhesive resin) is employed.
It must soften at a temperature of 〜140 ° C.

It is sufficiently possible to adopt a film having excellent gas barrier properties, such as vinylidene chloride, as the material of the base film 12a constituting the decorative film 12. In this case, it is desirable that the “ethylene-vinyl acetate copolymer” in the hot melt adhesive, which is the material of the adhesive layer 12b, be replaced with the “polyvinylidene chloride copolymer”.

The gas barrier properties of Examples 1 to 3 of the packaging container 10 molded from the above materials were measured. The results shown in Table 1 were obtained. In this case, the packaging container 10 according to each embodiment
Is the state shown in FIG. 1 and does not have the decorative film 12 on the bottom surface 11c of the container body 11.

Comparative Examples 1 to 9 in Table 1 are container bodies 11 made of only a foamable synthetic resin. The gas barrier property measurement method adopted here is such that 100 g of calcium chloride is put in each packaging container 10 or the container body 11 made of only an expandable synthetic resin, and then the seal attaching flange 14 is used for a lid which is usually used. And left in an atmosphere having a humidity of 90% and a temperature of 40 ° C. for about 3 days to measure how much the total weight increases due to moisture absorption of calcium chloride in the container body 11. It was done by. The moisture permeability in the table is a value obtained by dividing the total increase weight (which may be considered as the weight of water) after 3 days by 3, and it is possible to know how many grams of moisture were absorbed per day from this value. Things.

[0044]

[Table 1]

It can be seen from Table 1 that the packaging container 10 according to the present invention has a gas barrier property that is about four times or more that of the case where only the container body 11 made of the expandable synthetic resin without the decorative film 12 is used. It is to have. In addition, the packaging container 10 according to each embodiment includes a bottom surface 11 c of the container body 11.
Did not have the decorative film 12, but if the packaging container 10 in which the decorative film 12 was also formed on the bottom surface 11c of the container body 11, that is, the packaging container 10 according to claim 3, It can be easily understood that the gas barrier property is further improved.

In the packaging container 10, a decorative film 12 is integrally formed on the entire outer surface 11a of the container body 11, and the decorative film 12
Before the substrate film 1 is integrated with the container body 11, the base film 1
2a and an adhesive layer 12b formed in advance on the back side thereof.
May be provided in a grid shape (lattice shape) as shown in an enlarged manner in FIG. The grid-like adhesive layer 12b can freely adjust the size of the grid and the interval between the grids by applying a printing technique, for example.

In order to integrate the decorative film 12 into the container body 11 as described above, beads are injected from a bead injection hole into a gap in a cavity of a mold for molding the packaging container 10. That is, the beads are heated and foamed by steam from the steam introduction hole. It is important that the injection of the beads and the volume increase due to the foaming of the beads
The flow of gas existing in the gap in the cavity is shown in FIG.
This occurs as shown in FIG. Since this gas flow is guided by the decorative film 12 itself formed of a material having a high gas barrier property and by a large number of adhesive layers 12b formed in a grid on the back surface of the decorative film 12, FIG. As shown in FIG. 7, it is very easy to flow from between the adhesive layers 12b. As a result, the gas existing in the gap in the cavity and the gas generated during foam molding flow while correcting the position of the decorative film 12, as shown in FIG.

In other words, when the beads are injected and the beads are foamed, the decorative film 12
Since the gas flow as shown in FIG. 7 is easily generated, even if the decoration film 12 is misaligned with respect to the inner surface of the outer mold, the gas flow and the decoration film 12 itself have The decorative film 12 is corrected so as to be at a correct position with respect to the inner surface of the cavity by an overall action such as restoring property.

Of course, at the time of bead foaming, since the inside of the outer mold 10 is heated by steam introduced from the steam introduction hole, by the time the bead foaming is completed, the adhesive layer 12b It is sufficiently dissolved so that the surface of the container body 11 to be completed and the decorative film 12 can be bonded. Therefore, when the foaming of the beads is completed and the container body 11 is completed, and the cooling water starts to be injected from the steam introduction hole, the decorative film 12 is integrated with the surface of the container body 11 without any gap. . As a result, the packaging container 10 shown in FIG. 1, which is the object of the present invention, is completed as a complete one.

[0050]

As described in detail above, in the invention according to the first aspect, the decorative film 12 before being integrated with the container body 11 has a high gas barrier property and a thickness of 50 to 120 microns. The packaging container 10 was formed from a base film 12a and an adhesive layer 12b formed on the back side of the adhesive layer 12b and softened at a temperature of 120C to 140C. " This makes it possible to take full advantage of the advantages of forming by foamed bead molding, and also to achieve sufficient "gas barrier properties", and to provide an excellent feel when held in hands. Thus, it is possible to provide a packaging container capable of storing and preserving so-called “raw” for a long period of time.

Further, the packaging container 10 according to claim 2 is
"A packaging container 10 for food, in which a decorative film 12 is integrally formed on at least one of the outer surface 11a and the inner surface 11b of the container body 11 formed by foaming bead molding. The decorative film 12 before being integrated into the
Base film 12a having a thickness of ~ 120 microns
And an adhesive layer 12b formed in advance on the back side and softened at a temperature of 120 ° C. to 140 ° C., and the adhesive layer 12b is formed on the base film 12a.
It was formed in a grid on the back side of the
There is a feature in its configuration, and thereby, it is possible to fully utilize the advantages of forming by foamed bead molding, and to provide a decorative film capable of satisfactorily discharging gas generated during foaming molding. The positioning and correction of the decorative film with respect to the mold can be performed automatically and easily, and the "gas barrier properties" can be made sufficient, and the feel when held in the hand is improved. Thus, it is possible to provide a packaging container 10 for food that can store and store so-called "raw" food for a long period of time.

In the packaging container 10 according to the third aspect, the decorative film 12 of the packaging container 10 according to the first or second aspect is applied to the bottom surface 1 of the container body 11.
The present invention is characterized in that it also covers 1b, and can achieve the same object as the invention of claim 1 described above, and also provides a packaging container in which "gas barrier properties" are more effective. I was able to do it.

In the packaging container 10 according to the fourth aspect, the packaging container 10 according to any one of the first to third aspects is provided with a predetermined print 30 on the surface of the decorative film 12. In addition to achieving the same object as the first or third aspect of the present invention, it is possible to provide a packaging container having a very beautiful decoration on the surface.

[Brief description of the drawings]

FIG. 1 is a perspective view of a packaging container according to the present invention.

FIG. 2 is an enlarged perspective view of a part of the packaging container, in which a part of a decorative film is peeled off.

FIG. 3 shows a place where a decorative film is formed in the packaging container, wherein (a) is a partially enlarged cross-sectional view of the packaging container when formed on the outer surface, and (b) is when the inner container is formed on the inner surface. It is a partial expanded sectional view of a packaging container.

FIG. 4 shows an embodiment in which a decorative film is also formed on the container body in the packaging container, wherein (a) is a partially enlarged cross-sectional view of the packaging container formed on the outer surface, and (b) is the inner portion. It is a partial expanded sectional view of the packaging container when formed on the side.

FIG. 5 is a partially enlarged sectional view of a decorative film used in the present invention.

FIG. 6 is a partially enlarged perspective view of an adhesive layer formed in a grid on the back surface of the decorative film.

FIG. 7 is a perspective view showing how gas present inside the decorative film flows.

FIG. 8 is a perspective view showing a state in which automatic position correction is performed from a state where the decorative film is shifted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Packaging container 11 Container main body 11a Outer side surface 11b Inner side surface 11c Bottom surface 12 Decorative film 12a Base film 12b Adhesive layer 13 Thread end 14 Seal sticking flange 20 Irregular part 30 Printing

Claims (4)

[Claims] 1. A packaging container for food in which a decorative film is integrally formed on at least one of an outer surface and an inner surface of a container body formed by foaming bead molding. The decorative film before being integrated is made of a base film having a high gas barrier property and a thickness of 50 to 120 μm, and a base film formed in advance on the back side of the base film at 120 ° C.
With the adhesive layer softening at a temperature of 140 ° C., the adhesive layer of the decorative film penetrates into the uneven portions on the surface of the container body, and the surface of the decorative film becomes smooth. Packaging for food. 2. A packaging container for food, wherein a decorative film is integrally formed on at least one of an outer surface and an inner surface of a container body formed by foamed bead molding, wherein the container body is The decorative film before being integrated is made of a base film having a high gas barrier property and a thickness of 50 to 120 μm, and a base film formed in advance on the back side of the base film at 120 ° C.
And an adhesive layer that softens at a temperature of 140 ° C., and the adhesive layer is formed in a grid shape on the back side of the base film in advance. Packaging container. 3. The packaging container for food according to claim 1, wherein the decorative film also covers an outer surface or an inner surface of a bottom surface of the container body. 4. The packaging container for food according to claim 1, wherein a predetermined printing is applied to a surface of the decorative film.