JP6908969B2 - Packaging container - Google Patents

Description

The present invention relates to, for example, a packaging container for foods sold at supermarkets and convenience stores, and more particularly to a packaging container sealed with a top-sealing lid material that extends the storage period of foods and is easy to put on and take off.

Conventionally, packaging containers (PSP containers) made by molding polystyrene paper (PSP) into a desired shape have been widely used for packaging foods sold at supermarkets and convenience stores, for example. In the specifications of such packaging containers, attention was paid to the design including the handle on the surface, the oil resistance of the part in contact with food, and the ease of recycling related to tray recovery. In particular, regarding the design, the outer peripheral (flange) portion of the upper end was designed to be curved in consideration of preventing wrinkles by wrapping in addition to preventing damage due to vibration or dropping in the distribution process of the product.

However, with regard to foods for external sale in recent years, reduction of waste amount and reduction of profit margin by discounting selling price have become issues, so extension of expiration date (prolongation of storage period) and cost reduction due to packaging can be achieved. It has been regarded as necessary. In view of this point, in wrap packaging, it is difficult to secure the airtightness unless the entire container is covered, and the wrap cost becomes higher as the amount used increases. Therefore, by using the lid material for the top seal (for example, the top seal), the problem of wrapping can be avoided. However, if the outer peripheral portion of the container is curved, the adhesive strength of the top seal lid material may be low, and there is a concern that the container may be peeled off during the distribution process of the product.

Therefore, the idea of a container having a flat outer peripheral portion has been proposed (see, for example, Patent Documents 1 and 2). That is, the flange of the container is flat, and the adhesive strength of the sealing material is expected to be higher than that of the curved surface.

Design Registration No. 1476981 Design Registration No. 148,899

However, in the above-mentioned idea, the step of attaching the lid material to the flange is not considered. Generally, when the top seal lid material is attached, heat is applied to the lid material to melt the resin in contact with the flange and heat weld it. For this reason, if the width of the flat part of the flange is narrow over the entire circumference, or if the width is uneven depending on the location (for example, one side is wide and the other side is narrow), heat may not be applied uniformly. As a result, the sealing strength will vary, and the sealing time will have to be lengthened in order to apply heat evenly, resulting in reduced productivity. Therefore, the device itself must be made highly accurate. Do not get.

As described above, the idea of providing a flat portion on the flange alone does not reach the problem that can be solved by using the lid material for the top seal in the polystyrene foam packaging container. That is, the top seal lid material should be easily heat-welded to the flat portion of the flange, and should not only have a shape that is easily peeled off from the flange when opened, but also have a rigidity that can withstand deformation when the lid material is attached and detached.

Furthermore, in combination with the lid material for top seal, the air in the container is replaced with a gas other than oxygen (for example, nitrogen gas, carbon dioxide gas or a mixed gas thereof), and the storage period of the food in the container (for example, a mixed gas thereof). If it is desired to extend the expiration date), it is desired that the multilayer laminated film attached to the container body has a gas barrier function to reduce the gas permeability. In this case, the lid material does not peel off from the laminate film at the time of opening, but peels off from between the laminate film and the base material, and the food remains wrapped in the lid material and the laminate film (bag shape). It should be designed so that the food cannot be taken out and the bagging phenomenon does not occur.

Therefore, a first object of the present invention is to provide a packaging container capable of reliably heat-welding a top seal lid material to a flange. A second object is to provide a packaging container having a low gas permeability and suitable for extending the expiration date of food.

In order to solve the above problems, the packaging container in the present invention is made of polystyrene foam, and extends outward from the bottom, the side portion that stands up from the outer circumference of the bottom portion, and the upper end of the side portion. The flange portion is provided with a flange portion, and the flange portion is characterized by having a flat portion having a width of 4 mm or more over the entire circumference.

Further, it is desirable that the thickness of the bottom portion or the side portion is thicker than the thickness of the flat portion of the flange portion.

Further, it is desirable that a thin portion having a thinner thickness is formed on the outer edge of the flat portion over the entire circumference.

Further, it is desirable that a multilayer film having a gas barrier layer and having a thickness of 20 μm or more and less than 60 μm manufactured by a coextrusion method is laminated on the inside of the bottom portion and the side portion and the front side of the flange portion.

Further, as a method for manufacturing a packaging container in the present invention, a step of heating a raw fabric sheet on which the above-mentioned multilayer film is laminated before molding of the packaging container to obtain a sheet after secondary foaming and a step of obtaining a sheet after secondary foaming and after the above-mentioned secondary foaming It is desirable that the sheet is provided with a step of obtaining a desired molded sheet by double-sided vacuum forming, and that the inside of the double-sided vacuum forming mold satisfies the following conditions.
In-mold clearance of the flange part-thickness of the sheet after secondary foaming = 0
The "in-mold clearance" means a space created when the male-side mold and the female-side mold for molding the packaging container are in mesh with each other.

Further, the method of using the packaging container in the present invention includes a step of packing food in the packaging container, a step of attaching a predetermined lid material to the flange portion of the packaging container containing the food, and the flange portion. It is characterized by comprising a step of adhering the lid material and sealing the packaging container.

Since the packaging container according to the present invention has a flat portion having a width of 4 mm or more over the entire circumference of the flange portion, the top seal lid material can be easily attached to and detached from the flange portion. That is, since the flat portion of the flange portion has a width of 4 mm or more and extends over the entire circumference, even with a standard top sealing machine, the top sealing lid material can be reliably heat-welded within the width of the flat portion. Therefore, it is possible to mass-produce bento boxes and prepared foods in which food is packed in a polystyrene foam packaging container sealed with a top seal lid material.

Further, by molding the sheet so that the thickness of the bottom portion or the side portion is thicker than the thickness of the flat portion of the flange portion, the mechanical strength of the entire container can be increased while maintaining the flat portion of the flange portion. can.

It is a top view and a front view of a packaging container. It is an end view and an enlarged end view of a part of a packaging container. It is an end view of another part of a packaging container. It is an enlarged end view of a part of a state in which a lid material is attached to a packaging container. It is an enlarged end view of another part of a packaging container. It is a figure explaining an example of the function of a packaging container. It is another figure explaining an example of the function of a packaging container. It is a figure explaining the molding method of the packaging container.

Hereinafter, the shape of the packaging container according to the embodiment of the present invention will be described with reference to FIG.

The packaging container according to the embodiment of the present invention is made of polystyrene foam, and has a bottom portion 1, a side portion 2 that stands up from the outer circumference of the bottom portion, and a flange portion that extends outward from the upper end of the side portion. The flange portion has a flat portion 31 having a width of 4 mm or more over the entire circumference. Here, the polystyrene foam may contain a resin such as polyphenylene ether (PPE) or methacrylic acid, the content of which may be less than 30% by mass, and 70% by mass or more of polystyrene. good. Further, the polystyrene foam preferably contains 75% by mass or more of polystyrene, and more preferably 85% by mass or more.

Further, it is desirable that the thickness of the bottom portion 1 or the side portion 2 is thicker than the thickness of the flat portion 31 of the flange portion 3. According to such a configuration, as will be described later, the strength of the entire container can be increased while reducing the surface roughness of the flat portion 31 of the flange portion 3. That is, the air bubbles contained in the foam can be reduced by thinning the flange portion 3 and increasing the density. As a result, the surface roughness of the flat portion of the flange portion 3 can be reduced.

Further, a thin portion 31a having a thinner thickness may be formed on the outer edge of the flat portion 31 over the entire circumference.

Further, a multilayer film produced by a coextrusion method having a gas barrier layer and a thickness of 20 μm or more and less than 60 μm may be laminated on the inside of the bottom portion 1 and the side portion 2 and on the front side of the flange portion 3.

Further, the method for manufacturing a packaging container according to an embodiment of the present invention includes a step of heating a raw fabric sheet before molding of the packaging container to obtain a sheet after secondary foaming, and a double-sided vacuum forming the sheet after secondary foaming. It is desirable that the inside of the double-sided vacuum forming mold satisfies the following conditions, including a step of obtaining a desired molded sheet by molding.
In-mold clearance of flange part-thickness of sheet after secondary foaming = 0
Further, in the above manufacturing method, it is desirable that the inside of the double-sided vacuum forming mold satisfies the following conditions.
In-mold clearance at the bottom and sides-Thickness of the sheet after secondary foaming> 0
According to this configuration, the thickness of the flange portion 3 can be made thinner than the thickness of the bottom portion 1 or the side portion 2, and as a result, the mechanical strength of the entire container is maintained while maintaining the peel strength between the flange portion and the multilayer film. Can be enhanced.

Further, another method for manufacturing a packaging container according to an embodiment of the present invention includes a step of heating a raw fabric sheet before molding of the packaging container to obtain a secondary foamed sheet, and a step of obtaining the secondary foamed sheet. It is desirable that the back side of the packaging container is provided with a step of obtaining a desired molded sheet by single-sided vacuum forming in which vacuum is drawn from the corresponding direction, and the inside of the single-sided vacuum forming mold satisfies the following conditions.
In-mold clearance of flange part-thickness of sheet after secondary foaming> 0

Here, in the packaging container shown in FIG. 1, a post-secondary foamed sheet obtained by heating the corresponding raw sheet before molding the packaging container is inserted into, for example, the mold shown in FIG. 8A. It can be obtained by vacuum forming. The mold is a space corresponding to the bottom portion 1, the side portion 2 and the flange portion 3 constituting the packaging container (hereinafter, also referred to as “in-mold clearance”), and each of the in-mold clearances has a predetermined dimension.

Then, as shown in FIG. 8 (b), the clearance in the mold is, for example, the bottom 4 . 0 μm, side 4 . 0 μm, flange 3 . When the thickness of the sheet after secondary foaming is 0 μm and the thickness of the sheet after secondary foaming is 3.0 μm, the following relational expression of the difference between the clearance in the mold and the thickness of the sheet after secondary foaming is established.
Flange = 0 Side / bottom > 0
That is, since the in-mold clearance of the side and bottom is 4.0 μm and the thickness of the sheet after secondary foaming is 3.0 μm, 1.0 μm of resin is present in the in-mold clearance of the side and bottom before molding. There is a space that does not exist, that is, a surplus space ( side / bottom > 0). On the other hand, since the flange portion is 3.0 μm and the sheet thickness after secondary foaming is 3.0 μm, there is no excess space in the in-mold clearance of the flange portion before molding (flange portion = 0), that is, in the mold. The clearance is filled with resin.

Further, as shown in FIG. 8C, the dimensions of the container body after molding differ depending on the vacuum forming of the secondary foamed sheet inserted into the mold. That is, in the case of single-sided vacuum forming, the material is molded by attracting from the lower side of the sheet after secondary foaming in a vacuum state. Therefore, the dimensions of the molded sheet do not change. On the other hand, in the case of double-sided vacuum forming, after secondary foaming, the sheet is attracted and molded in a vacuum state from both the upper and lower sides. Therefore, in the molded sheet, the portion corresponding to the side portion / bottom portion is foamed in the vertical direction, and the thickness is equivalent to the in-mold clearance of 4.0 μm of the side portion / bottom portion.

Further, the method of using the packaging container in one embodiment of the present invention includes a step of packing food in the packaging container, a step of attaching a predetermined lid material to the flange portion 3 of the packaging container containing the food, and a step of attaching a predetermined lid material. It is desirable to include a step of adhering the flange portion and the lid material to seal the base material.

Next, with reference to FIGS. 1 to 3, the structure, molding method, and usage method of each part of the packaging container according to the embodiment of the present invention will be described. FIG. 1A is a plan view of the packaging container, and FIG. 1B is a front view of the packaging container. 2 (a) is an end view of AA of FIG. 1 (a), and FIG. 2 (b) is an enlarged view of the X portion of FIG. 1 (a). FIG. 3 is a CC end view of the BB portion of FIG. 1 (a).

As shown in FIG. 1, the bottom portion 1 forms a rectangular food placing portion on which food is placed. The side portion 2 is curved and connected to the outer peripheral edge of the bottom portion 1 and stands diagonally upward. The flange portion 3 is curved and connected to the upper end of the side portion 2, and extends horizontally toward the outside.
The food placing portion of the bottom portion 1 may be circular or oval, and may be flat or uneven. The radius of curvature of the portion where the bottom portion 1 and the side portion 2 are connected is not limited, and this side portion may be bent and connected to the outer peripheral edge of the bottom portion. The standing angle of the side portion 2 with respect to the bottom portion 1 is not limited, and the side portion 2 may stand vertically. The radius of curvature of the portion where the side portion 2 and the flange portion 3 (particularly the back surface of the flange portion) are connected is 2 mm or less, preferably 1 mm or less. A vacuum hole may be formed in a mold near (for example, the apex of a curved arc or a flat portion adjacent to this arc). There is no limitation on the thickness of the bottom portion 1 or the side portion 2, the thickness of the flange portion 3, and the ratio thereof. It is preferable that the multilayer film F having a gas barrier layer is laminated on the inside of the bottom portion 1 and the side portion 2 and on the front side of the flange portion 3. As a result, the transmittance of the gas entering from the outside of the bottom portion 1 and the side portion 2 can be reduced.

In such a multilayer film F, two or more resins (for example, a first thermoplastic resin layer, an adhesive resin layer, a gas barrier layer, an adhesive resin layer, and a second thermoplastic resin layer) are extruded through a die extrusion port (thin slit). It may be a laminated film produced by a coextrusion method in which both are extruded from a similar gap). Such a multilayer film F may be attached to a base material via an adhesive, and may have a thickness of 20 μm or more and less than 60 μm, and 30 μm or more and less than 50 μm.

The gas barrier layer, for example, oxygen gas, water vapor gas, is not particularly limited as is lower gas permeability such as carbon dioxide gas, specifically, 1000ml ^/ m 2 · 24hr oxygen permeability according to JIS K 7126 is at 25μm thickness The resin may be a resin having a MPa (75% RH at 20 ° C.) or less and capable of coextrusion, and examples thereof include ethylene-vinyl alcohol copolymer (EVOH) and polyamide (PA).

Here, as shown in FIG. 2, the flat portion 31 is formed on the front surface and the back surface of the flange portion 3. The width of the flat portion 31 is 4 mm or more in width from the inner edge end to the outer edge edge of the surface of the flange portion 3 and over the entire circumference. The multilayer film F is attached to the entire flat portion 31.
The thickness of the flat portion 31 is preferably 3.5 mm or less. The flat portion 31 is preferably 6 mm or more in width and 3.5 mm or less in thickness, more preferably 8 mm or more in width and 3.0 mm or less in thickness, and further preferably 10 mm or more in width and 2.7 mm or less in thickness. Further, the thickness tolerance (difference between the maximum value and the minimum value) of the flat portion 31 is preferably -10 to + 10% of the thickness, and more preferably -5 to + 5% of the thickness. .. According to such a configuration, the top sticker described later can be attached without any problem. That is, since the thickness of the flat portion 31 is uniform, the heat applied when the top seal is attached is evenly transferred to the entire flat portion 31. As a result, it is possible to avoid the occurrence of partial bias in the adhesive strength between the top seal and the flat portion 31. In order to realize such a tolerance, double-sided vacuum forming described later may be adopted. The flat portion 31 may be formed not only on the front surface of the flange portion 3 but also on the back surface from the inner edge end to the outer edge end and over the entire circumference with a width of 4 mm or more. In this case, the front surface and the back surface of the flange portion 3 may be parallel to each other, and the front surface side and / or the back surface side may be inclined. The position of the flat portion 31 may be the inner edge side, the outer edge side, or the center of the flange portion 3. When the flat portion 31 is located on the entire width direction of the flange portion 3 or on the outer edge side, the radius of curvature of the outer edge edge of the flat portion is preferably 2.5 mm or less.

At the outer edge of the flat portion 31, a thinner thin portion 31a is formed over the entire circumference. The multilayer film F is adhered to the tip of the thin portion 31a. As a result, the multilayer film F is less likely to be peeled off from the base material at the tip of the thin portion 31a, and the bagging phenomenon is less likely to occur.
The width of the thin portion 31a is preferably 0.5 mm or more. The thickness of the thin portion 31a is not limited.

Further, as shown in FIG. 1, a groove portion 4 leading from the bottom portion to the side portion is formed in the bottom portion 1 and the side portion 2. The groove portion 4 is formed by a valley portion of an uneven portion provided on the bottom portion 1 or the side portion 2. This makes it easier for the gas that suppresses the deterioration of food, such as the inert gas, to spread throughout the container.
The depth of the groove 4 is 0.5 mm or more, preferably 1.0 mm or more. The end face shape of the groove portion 4 may be an arc shape, a rectangular shape, or a V shape. The length of the groove portion 4 is not limited, and may be connected from one side portion 2 to the other side portion 2 via the bottom portion 1. There is no limitation on the width, orientation and position of the groove portion 4. The groove portion 4 may be singular or plural.

Here, as shown in FIG. 3, corner-cut corners 5 are provided at the four corners in the plan view of the portion where the bottom portion 1 and the side portion 2 are connected in series. As a result, it is possible to prevent the multilayer film F from being pulled and thinned or cracked, as compared with the case where the portion where the bottom portion 1 and the side portion 2 are continuously connected is a curved surface.
The shape of the corner cutting portion 5 is not limited to a triangle, and may be a rectangle, a circle, or an ellipse. There is no limitation on the area and angle of the corner cutting portion 5. The corner cut portion 5 may be one in which the four corner portions of the bottom portion 1 are chamfered.

Further, as a method for molding the packaging container shown in FIG. 1, double-sided vacuum forming is preferable. For example, a space for forming the bottom portion 1, the side portion 2 and the flange portion 3 of the secondary foamed sheet obtained by heating the raw sheet to which the multilayer film is attached (hereinafter referred to as “in-mold clearance”). When molding with a mold that forms, the clearance inside the mold is thinner than the thickness of the part corresponding to the bottom and side parts, and the thickness of the part corresponding to the flange part is thinner, and by molding with double-sided vacuum, after molding The thickness of the bottom portion and / or the side portion of the packaging container is thicker than the thickness of the flat portion 31 of the flange portion. As a result, not only the flat portion 31 becomes smoother, but also the peel strength between the multilayer film F and the base material and the rigidity of the container can be increased.

Here, the surface roughness Ra of the flat portion 31 is preferably less than 2.0 μm, more preferably less than 1.5 μm, and even more preferably less than 1.0 μm. According to such a configuration, the top seal lid material can be more reliably heat-welded within the width of the flat portion.

In addition, the outline of the measurement test (measurement standard, measuring machine, measuring condition) of the surface roughness Ra of the flat portion 31 will be described.
≪Measurement standard≫
Surface roughness measurement specified in JIS B 0601 << Measuring machine >>
"SURFTEST SV-400" manufactured by Mitutoyo
≪Measurement conditions≫
The measurement range is within 2.5 mm from the outer circumference (outer end edge) of the flange portion of the packaging container. In the packaging container of the present invention (Example 1), the measurement location is the center of the width of the flat portion 31 of the flange portion 3, and in the conventional packaging container (Comparative Example 1), the apex of the curved surface portion of the flange. (Peak).

The measurement results of Example 1 and Comparative Example 1 performed based on the above-mentioned outline of the surface roughness Ra measurement test are shown in Table 1 below. According to this, it was 0.96 μm in Example 1 and 2.22 μm in Comparative Example 1. That is, since the surface roughness of the flat portion 31 in Example 1 is lower than that of the curved surface portion of the flange of the conventional packaging container in Comparative Example 1, the top seal lid material is more reliably heat-welded. Can be done.

Further, as a method of using the packaging container shown in FIG. 1, a step of filling the packaging container with food, a step of attaching a lid material to the flange portion 3 of the packaging container containing the food, and the flange portion. It is desirable to include a step of adhering the lid material and the lid material to seal the packaging container.
For example, in a manufacturing factory or a retail store, food (for example, meat) is packed in the container shown in FIG. After the food is packed in a container, gas replacement is performed. To attach the top seal lid material, for example, "Eco Wrap GLS-L" manufactured by Okura Industrial Co., Ltd. is used, and the top seal lid material is attached to the flange portion of the container containing the food. After the top seal lid material is attached, the flange portion and the top seal lid material are adhered and sealed by thermocompression bonding using "SN-2S (N2N)" manufactured by Shinwa Machinery Co., Ltd. Cut the top seal lid along the outer circumference of the container. The expiration date of the food packaged in this way could be extended.

As shown in FIG. 4, the top seal lid material S is thermocompression-bonded to the flat portion 31 via the multilayer film F with respect to the flange portion 3, so that the inside of the container is sealed. Further, since the top seal lid material S is thermocompression-bonded to the flat portion 31, the top-seal lid material S is not thermocompression-bonded to the thin-walled portion 31a, and a predetermined gap is formed between the thin-walled portion 31a and the upper end of the thin-walled portion. .. Due to this structure, when the top seal lid material S is peeled off, the multilayer film F is hard to be peeled off from the base material at the tip of the thin-walled portion 31a, and the bagging phenomenon is unlikely to occur.

As described above, the packaging container according to the embodiment of the present invention (hereinafter, also referred to as “the present packaging container”) has a flat portion 31 having a width of 4 mm or more over the entire circumference of the flange portion 3. The heat welding of the top seal lid material to this flange portion is ensured. That is, since the flat portion 31 of the flange portion 3 has a width of 4 mm or more and extends over the entire circumference, for example, even in a general top sealing machine, the top sealing lid material can be reliably heat-welded within the width of the flat portion. Can be done. Therefore, it is possible to mass-produce bento boxes and prepared foods in which food is packed in a polystyrene foam container for main packaging sealed with a top seal.

Further, by forming the sheet so that the thickness of the bottom portion 1 or the side portion 2 is thicker than the thickness of the flat portion 31 of the flange portion 3, the surface roughness Ra of the flat portion 31 of the flange portion 3 is reduced, and the entire container is formed. The strength of the can be increased. That is, the air bubbles contained in the foam can be reduced by thinning the flange portion 3 and increasing the density. As a result, the surface roughness of the flat portion of the flange portion 3 can be reduced.

The packaging container may be formed by thermoforming a synthetic resin sheet by, for example, sheet molding such as compressed air molding, vacuum pressure air molding, double-sided vacuum molding, and hot plate molding.

In addition, this packaging container is made by vacuum forming polystyrene paper (PSP), which is a type of expanded polystyrene, and is the same as the one made of non-expanded material due to the high heat insulation caused by air bubbles and the presence of air bubbles. Even when the thickness is obtained, the material cost is low because less material is required, and the light weight makes it easy to transport. Therefore, strictly speaking, it may be classified as a “polystyrene paper packaging container”.

Further, the person involved in the implementation of the present packaging container may be a consumer or a trader. Here, the "consumer" refers to a person who purchases food (hereinafter, also referred to as "sales item") stored in a packaging container from a retail store or a courier, and the "trader" means the main packaging. A food manufacturer that stores food in a container may be indicated.

When purchasing a product for sale, the consumer may observe the stored food from the front side of the packaging container. Further, when opening the top seal attached to the purchased product for sale, the hand or finger may be moved while observing the front side (particularly, the flange portion and its surroundings) of the main packaging container.
Although the consumer can observe the container for main packaging even after consuming the food, the attention of the observation at that time may be lower than the normal attention before purchase.

When a trader attaches a top sticker to a container for main packaging in which food is stored, the trader observes the front side and the back side (particularly, the flange portion and its surroundings) of the container for main packaging, and then attaches the top sticker with a predetermined device. It may be pasted to seal the opening portion of the container body. Further, after the top seal is attached, the front side and the back side (particularly, the flange portion and its surroundings) of the main packaging container may be observed along with quality control.
Although the trader can observe the container for main packaging even before storing the food, the attention of the observation at that time is lower than before and after attaching the top seal, which is the sealing means in the container for main packaging. You may.

Further, the basic and specific structure of the present packaging container may be segmented as follows. For convenience of reference, a part of the specific structure is numbered in FIG. 5 (partially enlarged end view of the flange portion and the upper side portion) (B-3, C-2).
(B) Basic structure A. A container body (b) having a flange portion, a side portion, and a bottom portion having a predetermined aspect ratio. Specific configuration mode B. Flange part B-1. Rounded corners on all sides B-2. Protruding portion provided at the end of the outer edge B-3. Front and back surfaces of the same width and flatness over the entire circumference C. Side C-1. C-2 that spreads outward and slopes. The area near the joint with the flange is flat. Bottom D-1. Square pyramidal trapezoidal convex part arranged in the central part

Here, although the basic structure (A) occupies a large proportion of the entire container for main packaging, the aspect ratio and the configuration of the container body (flange portion, side portion, and bottom portion) do not easily exceed a frame having a common shape. , The degree to which the attention of those involved in the implementation of this packaging container may be small.

On the other hand, the attention of ordinary consumers to the container for this packaging may be concentrated before the purchase of the product for sale and before the consumption of the food. In that respect, consumers considering the purchase of goods can generally be visually recognized from the center (D-1) of the bottom to the lower side of the concrete structure as long as the food is stored. It does not have to be. Further, although it is visible from above the side portion to the flange portion, the common shapes (B-1, B-2, C-1) of the side portion and the flange portion in the specific structure are consumer. It may be difficult to be the part that attracts the attention of.
That is, for the consumer observing the present packaging container, the front surface portion and the back surface portion (B-3) having the same width and flatness over the entire circumference of the flange portion in the specific structure, and the upper side portion and the flange portion. The structure (C-2) in which the vicinity of the continuous portion is flat may be a portion that attracts the most attention and has a great influence on the visual impression because the ratio of action and effect is large in the entire packaging container. ..

On the other hand, the attention of ordinary traders to the container for main packaging may be concentrated before and after the application of the top sticker to the container for main packaging in which food is stored.
That is, for a trader who observes the present packaging container, the front surface portion and the back surface portion (B-3) having the same width and flatness over the entire circumference of the flange portion in a specific structure, and the upper side portion and the flange portion. The structure (C-2) in which the vicinity of the continuous portion is flat may be a portion that attracts the most attention and has a great influence on the visual impression because the ratio of action and effect is large in the entire packaging container. ..

Further, the trader of the present packaging container may include, in addition to the above-mentioned food manufacturer, a retail store handling the product for sale and a logistics company for transporting the product to the retail store or the delivery company.

Here, the expiry date of the food stored in the packaging container corresponding to the conventional sealing means (for example, wrap packaging) sold in the conventional retail store was also 1 to 2 days. However, the expiration date of the food stored in the main packaging container, which enables a unique sealing means, can be expected to be extended by 3 to 4 days due to the unique sealing effect, and may be 5 to 6 days. You can expect it. As a result, the expiration date of the food sold at the retail store may be extended, and the amount of unsold food discarded may be reduced.

In addition, in the conventional food manufacturer, in consideration of the expiration date (1 to 2 days) of the food sold at the retail store, the time until the food is stored in the packaging container and managed as inventory (manufacturing lead time) and In order to strictly adhere to and shorten the time until inventory is shipped (shipping lead time), it is also necessary to secure workers who execute, for example, a 24-hour production plan. However, considering the expiration date (5 to 6 days) of the food stored in the main packaging container, which enables a unique sealing means, the time for storing the food in the main packaging container and managing it as inventory is extended. Since it can be expected, a 24-hour production plan is no longer necessary, and it is easy to reduce the number of workers. As a result, the labor force of food manufacturers can be reduced, and at the same time, it can contribute to solving the social problem of labor shortage.

Further, in consideration of the expiration date (1 to 2 days) of the food sold at the retail store, the conventional logistics company may be able to transport the food only to the retail store or the courier company which is close to the food manufacturer. However, considering the expiration date (5 to 6 days) of the food stored in the main packaging container, which enables a unique sealing means, the food manufacturer is sent to retail stores and courier companies located at medium to long distances. Transportation may be expected. As a result, with the expansion of the food distribution area, it is easy to realize a home delivery service for people requiring long-term care and the elderly.

As described above, in comparison with the packaging container corresponding to the conventional sealing means, the present packaging container which enables a unique sealing means has an extremely large influence on each trader, and in particular, the conventional type. A shape (C-) in which the front surface portion and the back surface portion (B-3) having the same width and flatness over the entire circumference of the flange portion, which is the difference from the above, and the vicinity of the continuous portion between the upper side portion and the flange portion are flat. 2) may be highly evaluated because it is easy to attract attention.

Further, an example of the function of the present packaging container that enables a unique sealing means will be described with reference to FIGS. 6 and 7.

First, as shown in FIG. 6 (A), the container body in the main packaging container in which polystyrene paper (PSP), which is a kind of expanded polystyrene, is vacuum-formed, is sent to a predetermined top seal device in a state where food is stored. May be good. At this time, the back surface portion having the same width and flat shape over the entire circumference of the flange portion of the container body may be in flush contact with the flat base portion of the apparatus. Next, the air in the container may be removed by gas replacement packaging and filled with an inert gas such as nitrogen or carbon dioxide. Then, as shown in FIG. 6B, the top seal may be attached flush to the flat surface portion having the same width over the entire circumference of the flange portion.

Here, when the top seal is attached to the container body, the flange portion is composed of a front surface portion and a flat surface portion having the same width and a flat shape over the entire circumference, as in the main packaging container shown in FIG. 7 (A). If so, it can be expected that there will be no problem in attaching the top sticker. Further, in order to surely attach the top seal, it is preferable that the flat front surface portion and the back surface portion of the flange portion are as wide as possible.
On the other hand, in the conventional packaging container shown in FIG. 7B, if there is a step near the continuous portion with the flange portion above the side portion or the radius of curvature of the connecting portion is too large, the back surface of the flange portion Since the portion cannot come into contact with the flat base of the top seal device flush with each other, there may be a problem in attaching the top seal. If there is a problem with sticking the top sticker, it may lead to deterioration of the quality of the stored food. Therefore, before attaching the top seal, for example, using a flat resin bucket, a flat back surface portion having the same width is provided over the entire circumference of the flange portion, and is continuously provided with the flange portion above the side portion. In some cases, it is inspected whether the area around the portion is flat.

In this way, in view of the function of the main packaging container that enables a unique sealing means, the action and effect of the main packaging container has an extremely large influence on the consumer, and is particularly different from the conventional packaging container. A shape in which the front surface portion and the back surface portion (B-3 in FIG. 5) having the same width and flatness over the entire circumference of the flange portion, which is a point, and the vicinity of the continuous portion between the upper part of the body portion and the flange portion are flat (FIG. 5). C-2) is easy to get attention.
Since the conventional packaging container is compatible with the wrap film type, the flange portion may have an arcuate cross section so that the wrap can be easily applied.

The packaging container in the present invention can be used in an industry related to external sales of foods in general, including, for example, lunch boxes, prepared foods, fresh foods, meats, and vegetables.

1 Bottom 2 Side 3 Flange 31 Flat 31a Thin wall 4 Groove 5 Corner cut F Multilayer film

Claims (5)

It is made of polystyrene foam and has a bottom portion, a side portion that stands up from the outer circumference of the bottom portion, and a flange portion that extends outward from the upper end of the side portion.
A gas replacement packaging container in which a multilayer film having a gas barrier layer manufactured by a coextrusion method is laminated on the bottom portion, the inside of the side portion, and the front side of the flange portion.
The flange portion is
It has a horizontal flat portion having a width of 4 mm or more for heat welding a predetermined lid material over the entire circumference .
The flat portion is
Thickness is 3.5 mm or less,
Surface roughness Ra = less than 2.0 μm,
At the outer edge of the flat portion, a thinner thin portion is formed over the entire circumference.
The thin-walled portion is a packaging container for gas replacement, which is sized so as to be a non-welded portion with a predetermined lid material to be mounted.
The gas replacement packaging container according to claim 1, wherein the radius of curvature of the portion where the side portion and the back surface of the flange portion are connected is 2 mm or less.
The invention according to claim 1 or 2, wherein corner-cut portions are provided at four corners in a plan view of a portion in which the bottom portion and the side portion are connected in series. Gas replacement packaging container.
The gas replacement packaging container according to any one of claims 1 to 3, wherein a groove leading from the bottom to the side is formed in the bottom and the side.


The step of packing food in the packaging container according to claim 1 and
The process of attaching a predetermined lid material to the flange of the packaging container containing the food, and
In a non-welded state between the upper end of the thin-walled portion formed at the outer edge of the flat portion of the flange portion and the lid material, the flange portion and the lid material are adhered to form the packaging container. How to use a gas replacement packaging container with a sealing step.

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