JP2015093688A - Container body, container, and manufacturing method of container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container comprising a container body in which interlayer peeling can be started properly from an opening start position.SOLUTION: An opening start end 26 projected in a tongue-like shape at a part of an outer peripheral edge of a flange part 25 is formed in such a way that an end part edge of the opening start end 26 is positioned above an opening surface. When attaching a lid body 3 to the flange part 25, the end part edge of the opening start end 26 is brought into contact with the lid body 3 first, pressed strongly, and then attached. Thus, the end part edge of the opening start end 26 and the lid body 3 are reliably attached, an interlayer can be reliably peeled from the end part edge of the opening start end 26 with a small force, and a satisfactory feeling of opening can be provided.

Description

  The present invention relates to a container main body having an opening start end at a flange portion, a container, and a method for manufacturing the container.

Conventionally, for example, as a container for foods, the top film is heat-sealed to the flange portion of the container body made of a multilayer sheet and firmly sealed, and when opened, it is easily opened by delamination of the multilayer sheet constituting the container body The structure which can be performed is known (for example, refer patent document 1).
This container has weakened the adhesive strength between specific layers among the layers constituting the multilayer sheet constituting the container body due to the adhesive force between the flange portion and the top film. Furthermore, the cut groove is provided in the opening part side of the container main body from the position where the top film in the flange part is heat-sealed. When the top film is opened, the container is opened by peeling the inner layer constituting the container body together with the top film from the outer peripheral edge to the position of the cut groove from the outer layer adjacent to the inner layer.

Japanese Patent Laid-Open No. 62-251363

By the way, delamination starts the peeling of the inner layer at the opening start position of the container body from the outer peripheral edge when the top film is rolled up and opened. For this reason, when the outer peripheral edge of the inner layer is not firmly fused to the top film, it cannot be peeled at the delamination start position, and delamination is started with a large opening force that breaks the inner layer at the firmly fused portion. There is a possibility that good openability may not be obtained.
It is an object of the present invention to provide a container body, a container, and a method for manufacturing the container that can appropriately start delamination from the opening start position.

  The container body of the present invention includes a storage recess having an opening for storing an object to be packaged, and a flange formed by extending from the outer peripheral edge of the opening, and a lid is attached to the flange. A container body having a multi-layer structure in which the opening is closed, and at least a part of the outer peripheral edge of the flange portion extends in a direction opposite to the bottom surface of the storage recess with respect to the outer peripheral edge of the opening. An opening start end provided in the form of an annular attachment region located on the opening side of the annular attachment region to which the lid is attached, and a layer facing at least a surface of the flange portion to which the lid is attached. And a cut groove for cutting.

In this invention, since the opening start end of the flange portion is located in the direction opposite to the bottom surface of the housing recess with respect to the outer peripheral edge of the opening portion, that is, upward, when the lid is attached to the flange portion, the end portion of the opening start end The edge first contacts the lid. Thereby, the edge part edge of an opening start end is reliably attached to a cover body, and it can peel reliably from the edge part edge of an opening start end, and can provide a favorable opening feeling.
Here, the term “annular” includes a round shape and a polygonal shape having a plurality of corners.

And in this invention, it is preferable that the said opening start end is inclined and provided in the reverse direction to the bottom face of the said storage recessed part in the shape of a tongue from the outer periphery of the said flange part.
In this invention, by making it the opening start end which inclines in the opposite direction to the bottom surface of the housing recess and protrudes in the shape of a tongue, the user can easily recognize the opening start position, and the user can easily perform the opening operation. .

In the present invention, it is preferable that the opening start end is formed so as to protrude from the outer peripheral edge of the upper surface of the flange portion in a direction opposite to the bottom surface of the housing recess.
In this invention, when the lid is attached to the flange portion by projecting and forming the opening start end from the outer periphery of the upper surface of the flange portion in a direction opposite to the bottom surface of the housing recess, that is, upward, First contacts the lid. As a result, the outer periphery of the opening start end is securely attached to the lid with a simple structure that protrudes upward, and the delamination can be reliably made from the end edge of the opening start end. Can provide.

Furthermore, in the present invention, it is preferable that the opening start end is provided on the entire outer periphery of the flange portion.
In this invention, since the entire outer periphery of the flange portion is used as the opening start end, delamination can be reliably performed from any position of the flange portion, and the opening operation of the user can be facilitated.

The container of the present invention includes the container main body of the present invention and a lid body that is attached to the flange portion of the container main body and closes the opening, and the container main body includes the flange portion and the lid body. It is characterized in that at least one interlayer adhesive force of the multilayer structure constituting the container body is formed smaller than the adhesive force.
In this invention, since the container main body of the present invention in which the lid is securely attached at the end edge of the opening start end is used, delamination can be reliably performed from the end edge of the opening start end, and a good opening feeling can be provided.
Here, the control of the adhesive force between the flange portion and the lid body and at least one interlayer adhesive force of the multilayer structure that constitutes the container body is controlled by the material and the layer thickness that constitute the multilayer structure of the flange portion and the lid body. It is controlled by the size of the bonding area between the lid and the flange.

A container manufacturing method according to the present invention provides a container main body having a multilayer structure including a storage recess having an opening for storing an article to be packaged, and a flange formed by extending from the outer peripheral edge of the opening. A method of manufacturing a container that attaches a lid to the flange portion and closes the opening, wherein at least a part of the outer peripheral edge of the flange portion is opposite to the bottom surface of the storage recess with respect to the outer peripheral edge of the opening. Forming a container body provided with an opening start end provided extending in a direction, and provided annularly on the opening side from an annular attachment region to which the lid is attached, and at least the flange portion A notch groove forming step for forming a notch groove in the flange portion for cutting one layer facing the surface to which the lid is attached, and at least a multi-layer structure constituting the container body by pressing the lid against the flange portion. one And heat-sealing step of heat-sealing said lid and said flange portion in a state in which the adhesive force increases with the lid and the flange portion than the interlayer adhesion, which comprises carrying out the.
In this invention, a container body having an opening start end provided on at least a part of the surface layer of the outer peripheral edge of the flange portion and extending in the direction opposite to the bottom surface of the storage recess with respect to the outer peripheral edge of the opening is formed, Since the lid is pressed against the flange portion of the obtained container main body and heat-sealed, the lid can be securely attached at the end edge of the opening start end, and a good opening feeling can be provided.

  A container manufacturing method according to the present invention provides a container main body having a multilayer structure including a storage recess having an opening for storing an article to be packaged, and a flange formed by extending from the outer peripheral edge of the opening. A method of manufacturing a container that closes the opening by attaching a lid to the flange portion, and is provided in an annular shape as the container body, located on the opening side from an annular attachment region to which the lid is attached Using at least a part of the outer peripheral edge of the flange portion of the container body, wherein the flange portion is provided with a cut groove for cutting at least one layer facing the surface to which the lid is attached in the flange portion, A container body holding step for holding the container body in a state of extending in the direction opposite to the bottom surface of the housing recess with respect to the outer peripheral edge of the opening, and pressing the lid against the flange portion, Structure Performing a heat-sealing step of heat-sealing the lid and the flange so that an adhesive force between the flange and the lid is larger than at least one interlayer adhesive force of the multilayer structure. It is characterized by.

  In this invention, the container body is held in a state in which at least a part of the surface layer on the outer peripheral edge of the flange portion extends in a direction opposite to the bottom surface of the housing recess with respect to the outer peripheral edge of the opening, that is, upward. Since it presses against a flange part and heat-seal | fuses, a cover body is reliably attached to the outer periphery of the flange part located above the opening surface. Therefore, by setting the outer peripheral edge of the flange portion positioned above the opening surface as the opening start position, delamination can be surely started at the edge at the opening start position, and a good opening feeling can be provided.

The perspective view which opened a part which shows the easy-open container of embodiment which concerns on the container of this invention. The top view which shows the said easily openable container. The side view which shows the said easily openable container. It is side surface sectional drawing which shows a part of said easily openable container, (A) is the position of II in FIG. 2, (B) is the position of II-II in FIG. Explanatory drawing which shows the condition which heat seals a cover body to the said container main body. The perspective view which opened a part which shows the easily openable container in other embodiment of this invention. The top view which shows the easily openable container in other embodiment of this invention. The side view which shows the said easily openable container. Side surface sectional drawing in the position of III-III in FIG. 7 of the said easily openable container. Side surface sectional drawing which shows the easily openable container in other embodiment of this invention. The top view which shows the easily openable container in other embodiment of this invention. The side view which shows the said easily openable container. Side surface sectional drawing in the position of IV-IV in FIG. 11 of the said easily openable container. Side surface sectional drawing which shows the easily openable container in other embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, a circular container is illustrated, but the present invention is not limited to this.

[Configuration of easy-open container]
1 to 3 show an easily openable container 1 which is a container according to the present invention, and this easily openable container 1 includes a container body 2 in which an article to be packaged is stored, and a lid 3 attached to the container body 2. ing.

(Container structure)
The container body 2 is formed by molding a multilayer sheet, specifically, by heating, and is a laminate in which two layers of a release layer 21 and a front lower layer 22 are laminated in this order (see FIG. 4). .
Here, the peeling layer 21 is a layer that comes into contact with an object to be packaged enclosed in the easy-open container 1 and is heat-sealed with the sealant of the lid 3. Although details will be described later, the heat seal portion 23 as an attachment region, which is a portion heat-sealed with the lid 3, is peeled from the container body 2 together with the lid 3.
As the peeling layer 21, for example, a material heat-sealed with the lid 3, preferably a polyolefin resin is suitably used. Specifically, polypropylene resins such as homopolypropylene (HPP), random polypropylene (RPP) and block polypropylene, polyethylene resins such as high density polyethylene (HDPE) and low density polyethylene (LDPE), linear ethylene- An α-olefin copolymer or the like is used.

The front lower layer 22 constitutes a lower layer of the release layer 21 adjacent to the release layer 21, and is delaminated with the release layer 21 when the easy-open container 1 is opened.
As a specific material constituting the upper and lower layer 22, for example, it is preferable that the material is composed of at least one selected from the group of olefin resin, polystyrene resin, and polyester resin.
As the olefin resin, specifically, polypropylene, polyethylene, and the like are used. In particular, polypropylene is preferably used because it is widely distributed and easily available, is inexpensive, and has high strength.
Specific examples of the polystyrene-based resin include general-purpose transparent and rigid GP grade polystyrene and impact-resistant HI grade polystyrene, and particularly required when HI grade polystyrene is used as a container. It is preferably used from the viewpoint of impact resistance.
As the polyester resin, specifically, amorphous polyester, crystalline polyester, or the like is used, and amorphous polyester is particularly preferably used for reasons of processability.

In particular, as the surface lower layer 22, a polymer containing at least a part of a propylene unit (hereinafter referred to as a polypropylene resin, and appropriately referred to as PP) and a polymer containing an ethylene unit at least in a part (hereinafter referred to as a polyethylene resin) It is preferable to use a resin composition in which PP: PE = 30% by mass or more and 99% by mass or less: 1% by mass or more and 70% by mass or less.
Here, if the mass ratio PP / PE is smaller than 0.67, there is a possibility that a resin pool is generated during heat sealing, resulting in inconvenience that unsuccessful opening occurs. In particular, when the mass ratio PP / PE is less than 0.429, rigidity may be insufficient, and when the mass ratio PP / PE is more than 99, flexibility may be insufficient.
The polypropylene resin is specifically selected from any of four types of homopolypropylene, random polypropylene, block polypropylene, and mixtures thereof. And when heat resistance is considered, it is preferable in order of a homo polypropylene, a block polypropylene, and a random polypropylene. Moreover, when considering the sealing properties with other layers, random polypropylene, block polypropylene, and homopolypropylene are preferable in this order.
Specific examples of the polyethylene-based resin include high-density polyethylene and low-density polyethylene. Particularly, low-density polyethylene is preferably used for reasons of molding process stability.

Note that an inorganic filler such as talc may be added to the front and lower layers 22.
Moreover, although the surface lower layer 22 is laminated | stacked directly adjacent to the peeling layer 21, between the peeling layer 21 and the surface lower layer 22, it does not flow by heat seals, such as an adhesive layer, or is comparatively difficult to flow. A thin layer may be provided.

The container body 2 has a substantially circular cup shape having a predetermined depth, and has a storage recess 24 in which a substantially circular opening 24A is opened to store an object to be packaged. The opening 24A A flange portion 25 is disposed on the periphery of the outer peripheral portion so as to project outward.
Further, the opening of the flange portion 25 is extended to a part of the outer peripheral edge in a tongue-like shape extending in a direction opposite to the bottom surface of the housing recess 24 with respect to the opening surface of the opening 24A, specifically obliquely upward. An end 26 is provided.

The thickness of the flange portion 25 of the container body 2 is preferably 200 μm or more and 2000 μm or less, more preferably 250 μm or more and 600 μm or less, and particularly preferably 300 μm or more and 500 μm or less.
Here, if the thickness of the flange portion 25 is less than 200 μm, there is a possibility that the rigidity of the container is lowered. If the thickness is greater than 2000 μm, many materials are required and the manufacturing cost (raw material cost) increases. Therefore, the above range is set.

Moreover, the notch 28 as a notch groove is provided in the flange part 25 in the state which cuts the peeling layer 21 which is a layer which faces at least the surface to which the cover body 3 is attached in the flange part 25 (refer FIG. 4). .
Here, the notch 28 is cut at the position of the notch 28 when the lid 3 is opened even when a part of the thickness of the release layer 21 in the position of the notch 28 remains. The depth is not particularly limited as long as it does not delaminate the release layer 21 on the opening 24A side. In particular, it is preferable that the depth reaches the surface lower layer 22, that is, a depth equal to or greater than the thickness dimension of the release layer 21.

The easy-open container 1 has the flange portion 25 and the lid 3 placed on the flange portion 25 with respect to the opening 24A being heat-sealed so that the heat seal portion 23 as an annular attachment region has a notch 28. It is located on the outer peripheral side, and the inside of the easy-open container 1 is sealed. Further, the lid 3 has an opening start portion 3A provided in a tongue-like shape on the outer peripheral edge, and is attached to the opening start end 26 of the container body 2 over the outer peripheral edge to form an opening seal portion 29. 2 is attached.
Further, in order to open the easily-openable container 1 in a sealed state, the lid 3 is pulled upward at the opening start portion 3A of the lid 3 as shown in FIG. As a result, peeling occurs between the peeling layer 21 and the lower layer 22 of the container body 2 having a multilayer structure, and the peeling layer 21 peels to the position of the notch 28. Then, after the delamination reaches the position of the notch 28, only the lid 3 is peeled off. For this reason, even if the lid 3 and the flange portion 25 of the container body 2 are firmly bonded, an easy peel is possible, and the easy-open container 1 is easily opened.

(Structure of the lid)
In the present embodiment, the lid 3 is a laminated body including an outer layer 32 that appears outside the easily openable container 1, a release layer 21 of the container body 2, and a seal layer 31 that is heat-sealed.
As the outer layer 32 constituting the lid 3, a polyethylene terephthalate (PET) film, a biaxially stretched nylon film (O—Ny) or the like can be used. The seal layer 31 can be made of a resin composition such as linear low density polyethylene (LLDPE).
Then, by heat-sealing the container body 2 and the lid 3, the release layer 21 and the seal layer 31 are fused to form the heat seal portion 23 and the opening seal portion 29. On the other hand, the peeling layer 21 of the container body 2 that is weak against the peeling is peeled off from the notch 28 and the outer lower layer 22 on the outer peripheral side.

[Seal operation]
Next, the sealing operation for attaching the lid 3 to the container body 2 will be described.
FIG. 5 is an explanatory diagram showing a situation in which the lid 3 is heat sealed to the container body 2.

In manufacturing the easy-open container 1, the container body 2 in which the opening start end 26 and the notch 28 are provided in the flange portion 25 is formed from the multilayer sheet. And when attaching the cover body 3 to this container main body 2, the sealing apparatus 40 provided with the annular seal disc | board 4 as shown in FIG. 5 is used.
In order to fuse the flange portion 25 of the container body 2 and the lid body 3 so that the easily openable container 1 is in a sealed state, the lid body 3 is overlaid on the flange portion 25 of the container body 2. Heat sealing is performed by lowering and pressing the annular seal disk 4 in a heated state from the upper surface.
At the time of this heat sealing, the opening start end 26 located at the uppermost position and the lid 3 are pressed, and the annular sealing disk 4 is further lowered, so that the lid 3 is heat sealed to the flange portion 25. By this heat sealing, the opening start portion 3A provided in a tongue-like shape on the outer peripheral edge is attached to the opening start end 26 of the container body 2 over the outer peripheral edge to form the opening seal portion 29, and the flange portion The lid 3 placed on 25 is heat-sealed to form a heat seal portion 23 as an annular attachment region located on the outer peripheral side from the notch 28, and the inside of the easy-open container 1 is sealed. The
Further, in order to open the easily-openable container 1 in a sealed state, the lid 3 is pulled upward at the opening start portion 3A of the lid 3 as shown in FIG. As a result, peeling occurs between the peeling layer 21 and the lower layer 22 of the container body 2 having a multilayer structure, and the peeling layer 21 peels to the position of the notch 28. Then, after the delamination reaches the position of the notch 28, only the lid 3 is peeled off. For this reason, even if the lid 3 and the flange portion 25 of the container body 2 are firmly bonded, an easy peel is possible, and the easy-open container 1 is easily opened.

[Effect of the embodiment]
As described above, in the above embodiment, the opening start end 26 of the flange portion 25 is formed so as to be positioned above the opening surface.
As a result, when the lid 3 is attached to the flange portion 25, the end edge of the opening start end 26 first comes into contact with the lid 3 and is strongly pressed and attached. For this reason, the end edge of the opening start end 26 and the lid 3 are securely attached, delamination can be reliably performed from the end edge of the opening start end 26, and there is no need to open the tearing layer 21 to break, It can be opened with an easy peel, that is, with a small opening force, and can provide a good opening feeling.

And in the said embodiment, the opening start end 26 is protrudingly formed in the shape of a tongue piece.
For this reason, the user can easily recognize the opening start position, and the opening operation of the user can be facilitated.

[Modification]
Although the best configuration for carrying out the present invention has been disclosed in the above description, the present invention is not limited to this. That is, the present invention has been described primarily with reference to specific embodiments, but with respect to the above-described embodiments without departing from the scope of the technical idea and object of the present invention, the material, quantity, and other details. In this configuration, those skilled in the art can make various modifications.
Accordingly, the description of the materials, layer structures, and the like disclosed above is exemplary for easy understanding of the present invention, and does not limit the present invention. Descriptions with names excluding some or all of the limitations are included in the present invention.

For example, the easy-open container 1 is not limited to the configuration having the circular opening 24A, and may be various shapes such as a quadrangle, an ellipse, a polygon, a gourd, a tear, and a character as shown in FIG. Applicable to
In addition, when there exists a corner | angular part like the rectangle shown in FIG. 6, not only when providing the opening start end 26 in all the positions of a corner but what is necessary is just to make at least one location the opening start end 26. FIG.

And although the opening start end 26 was provided in the flange part 25, the container main body 2 was formed so that the outer peripheral edge side of the flange part 25 inclines upwards, for example like embodiment shown in FIGS. Then, the lid 3 may be heat-sealed over the entire circumference of the outer peripheral edge of the flange portion 25, and the outer peripheral edge of the flange portion 25 may be used as the opening start end 26.
7 to 9, the outer peripheral edge of the lid 3 is formed so as to extend from the outer peripheral edge of the flange portion 25, and the entire outer periphery of the lid 3 is the opening start portion 3 </ b> A. .
With this configuration, delamination can be performed from any position on the outer periphery, and the opening workability can be improved.

Furthermore, the flange portion 25 and the opening start end 26 are not limited to be formed so as to be inclined obliquely upward, but may be formed to be curved, for example, as shown in FIG.
And as the container main body 2, as shown in FIG. 10, it can be set as the shape according to various uses, such as what provided the level | step difference 27. As shown in FIG.

Moreover, as the opening start end 26, for example, as shown in FIGS.
In the configuration shown in FIGS. 11 to 13, when the lid 3 is attached to the flange portion 25, the top portion of the opening start end 26 located at the outer peripheral edge of the upper surface of the flange portion 25 first comes into contact with the lid 3 and presses strongly. Attached. For this reason, the outer peripheral edge of the flange portion 25 and the lid 3 are securely attached, and the delamination can be reliably performed from the outer peripheral edge of the flange portion 25 which is the opening start position, and it is not necessary to open the tear layer 21 so as to break It can be opened with a small opening force, and a good opening feeling can be provided.
In addition, if the top part of the opening start end 26 is located above the opening edge of the opening part 24A, as shown in FIG. 14, the outer peripheral side of the flange part 25 may be formed so as to be inclined obliquely downward. .

And it is not restricted to the structure which attaches the cover body 3 using the container main body 2 previously formed so that the opening start end 26 may be located upwards with respect to an opening surface beforehand.
For example, the container body 2 in which the flange portion 25 is formed along the horizontal plane is used, and the outer peripheral edge side of the flange portion 25 and the end edge side of the tongue-shaped opening start end 26 are deformed so as to be positioned above the opening surface. The lid 3 is attached in this state. Even when the lid 3 is attached in this way, the outer peripheral edge of the flange portion 25 and the end edge of the tongue-shaped opening start end 26 are reliably pressed against the lid 3 and attached.

DESCRIPTION OF SYMBOLS 1 ......... Easily openable container which is a container 2 ......... Main body 3 ......... Cover body 23 ......... Heat seal part 24 which is a mounting area 24 ......... Storage recessed part 24A ... Opening part 25 ......... Flange Part 26 ......... Opening start end 28 ......... Notch which is a cut groove

Claims (7)

A storage recess having an opening for storing an article to be packaged, and a flange formed to extend from an outer peripheral edge of the opening, and the opening is formed by attaching a lid to the flange. A container body having a multilayer structure to be closed,
An opening start end provided with at least a part of the outer peripheral edge of the flange portion extending in the direction opposite to the bottom surface of the storage recess with respect to the outer peripheral edge of the opening, and an annular attachment to which the lid is attached A container main body comprising: an annular groove located on the opening side of the region, and having a cut groove for cutting at least one layer facing the surface to which the lid body is attached in the flange portion. The container body according to claim 1,
The container main body characterized in that the opening start end is provided in a tongue-like shape from the outer peripheral edge of the flange portion and is inclined in a direction opposite to the bottom surface of the storage recess. The container body according to claim 1 or 2,
The container main body characterized in that the opening start end is formed so as to protrude from the outer peripheral edge of the upper surface of the flange portion in the direction opposite to the bottom surface of the storage recess. The container body according to claim 1 or 3,
The container opening characterized in that the opening start end is provided on the entire outer periphery of the flange portion. The container main body according to any one of claims 1 to 4,
A lid that is attached to the flange portion of the container body and closes the opening,
The container body is formed such that at least one interlayer adhesive force of a multilayer structure constituting the container body is smaller than an adhesive force between the flange portion and the lid. A lid is attached to the flange portion on a multi-layered container body having a housing recess having an opening for storing an article to be packaged and a flange portion formed extending from the outer periphery of the opening. A container for closing the opening,
A container body forming step of providing an opening start end provided such that at least a part of the outer peripheral edge of the flange portion extends in a direction opposite to the bottom surface of the storage recess with respect to the outer peripheral edge of the opening;
An annular groove located on the opening side from the annular attachment region to which the lid is attached is provided in an annular shape, and a cut groove for cutting at least one layer facing the surface to which the lid is attached in the flange portion is formed in the flange portion. A notch groove forming step to be provided;
By pressing the lid against the flange portion, the lid and the flange are in a state where the adhesive force between the flange portion and the lid body is greater than at least one interlayer adhesive force of the multilayer structure constituting the container body. And a heat fusing step of fusing the parts to each other. A lid is attached to the flange portion on a multi-layered container body having a housing recess having an opening for storing an article to be packaged and a flange portion formed extending from the outer periphery of the opening. A container for closing the opening,
A notch groove that cuts at least one layer facing the surface to which the lid body is attached in the flange portion, which is provided annularly as the container main body and located on the opening side from the annular attachment region to which the lid body is attached. Is provided on the flange part,
A container main body holding step for holding the container main body in a state in which at least a part of the outer peripheral edge of the flange portion of the container main body extends in a direction opposite to the bottom surface of the storage recess with respect to the outer peripheral edge of the opening;
By pressing the lid against the flange portion, the lid and the flange are in a state where the adhesive force between the flange portion and the lid body is greater than at least one interlayer adhesive force of the multilayer structure constituting the container body. And a heat fusing step of fusing the parts to each other.

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