JP7707580B2 - Container opening and packaging container having the same - Google Patents

Description

The present invention relates to a container opening having a reclosable opening on at least one side.

Lids for packaging containers that can store contents and have openings that can be opened and closed have been proposed. For example, Patent Document 1 discloses:
A lid material that covers an opening for taking out an article of a packaging material, can be removably and reattachably attached to the packaging material, and can be peeled off in a direction from one end to the other end,
The packaging material has a lid base material having a tab at one end thereof, a sealing portion integrally extending from the lid base material, and a pressure-sensitive adhesive layer provided on the back surface of the lid base material and the sealing portion,
The lid base material has an inclined edge that is connected to the edge of the tab portion and is inclined with respect to the peeling direction of the lid material, and the sealing portion is extended from a part of the inclined edge of the lid base material,
An easy-to-break region having at least two cut portions is interposed between the lid base material and the closure portion,
the first cut portion extends obliquely outward from one base portion of the sealing portion toward the peeling direction of the lid material at an acute angle with respect to an imaginary inclined line corresponding to a part of an inclined edge that would be imagined if the sealing portion were not extended from the lid base material;
The second cut portion extends obliquely inward from the other base portion of the sealing portion in the opposite direction to the peeling direction of the lid material.

This lid material had a problem in that the distance between the tip of the opening initiation slit and the next slit that was not extended was small, making the difference in appearance after rupture less noticeable, making it difficult to clearly determine whether the container had been opened or not.

Patent No. 6171196

Therefore, the objective of the present invention is to obtain a container opening that allows clear visual confirmation of whether the container has been opened, even if the distance of the easily breakable area is small.

The container opening of the present invention is
A container opening is made of a base film having at least a substrate layer made of a stretched film and a sealant layer, and has a container opening film part having a tongue-shaped cut line on one surface as a film opening, and an opening label that can repeatedly open and close the film opening of the container opening film part,
The label can be opened by peeling the label from the base film to the vicinity of the other end starting from a gripping portion at one end of the label, the adhesion of which is inhibited by an adhesion-inhibiting layer,
The opening label is
An opening part for opening;
an unopened indicator that remains partially on the base film when the package is opened, thereby enabling determination of whether the package has been opened or not;
having
This container opening is characterized by having a cut portion consisting of a perforation that is inclined with respect to the opening direction and can be easily opened between the opening portion and the unopened indication portion, a shielding layer on the outside of the base material layer in the peripheral area of the cut portion, and an adhesion-preventing layer on the inside of the adhesive layer in the peripheral area of the cut portion.

When the container opening of the present invention is opened, not only can it be determined that the unopened indication portion remains and has peeled off, but also, because the opening label has a shielding layer that overlaps the cut portion and covers the peripheral area, when the container is opened, the hidden cut portion becomes visible, making it clear from a distance that the container has been opened.

1A to 1C are a front view, a cross-sectional view, a partially enlarged cross-sectional view, and a partially enlarged view showing a state when opening a container of the present invention. 1A to 1C are diagrams of a container opening film portion and an opening label used in the container opening of the present invention, a diagram of the film structure near the cut portion, and enlarged views of those portions. 1A to 1C are a plan view of a container opening of the present invention before opening, a plan view and a side view during the opening process, and a partially enlarged view thereof. 1 is a perspective view showing the appearance of a packaging bag and a packaging container using the container opening of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the container opening of the present invention will be described in detail with reference to the drawings.
1-1 is a diagram of a container opening 1 of the present invention. The container opening 1 is configured such that an opening label 3 is affixed so as to cover the periphery of an opening 21 of a container opening film portion 2.
A non-glued gripping portion 31 is provided protruding from one end of the opening label 3, and inclined cutout portions 32 are provided near both ends of the gripping portion 31.

FIG. 1-2 is a cross-sectional view taken along line AA across the notch 32 of the container opening 1 of the present invention, and FIG. 1-3 is a cross-sectional view taken along line BB across the gripping portion 31. As shown in FIG.
The container opening film portion 2 is composed of a base film 20 having at least a substrate layer 201 made of a stretched film and a sealant layer 202. Of course, a barrier layer, a printed layer, or the like may be provided between the substrate layer 201 and the sealant layer 202 or on the outside of the substrate layer 201.
A film opening 21 formed by a tongue-shaped cut line 211 is disposed in the center of the base film 20. The cut line 211 is formed from the substrate layer 201 side and completely penetrates the base film.

The open label 3 is composed of at least a label base layer 301 and an adhesive layer 302 .
Furthermore, an adhesion-preventing layer 303 is provided on the inner surface of the adhesive layer over the entire gripping portion 31 of the opening label 3 to inhibit adhesion.
The opening label 3 has an inclined cut 32, and the tip of the cut 32 on the tab side serves as an unopened indicator 34, and the base side of the opening label 3 serves as an opened part 35. The opened part 35 adheres to the film opening 21 of the base film and the outer periphery of the film opening.
The cut portion 32 is formed by a cut that penetrates entirely through the label from the base layer 301 side.

FIG. 2 shows a container opening film portion 2 used in the container opening 1 of the present invention, a diagram of an opening label, a diagram of the film structure in the vicinity of the cut portion, and partially enlarged views thereof.
FIG. 2-1 shows the container opening film portion 2. FIG.
The container opening film portion 2 has a film opening 21 formed in the center by a tongue-shaped cut line 211 .
The tongue-shaped base portion without any cut line forming the film opening 21 is connected to the peripheral edge of the container opening film portion 2 .
The cut line ends 212 at the base of the connected film opening 21 are curved to deviate from the opening direction, so that the film opening 21 is less likely to break even if the film opening 21 is opened with a strong force and an excessive force is applied to the base.

FIG. 2-2 shows the opening label 3.
The opening label 3 is a label that can repeatedly open and close the film opening 21. The opening label 3 has an opening portion 35 that adheres to the entire surface of the film opening 21 and its periphery and allows the container to be opened and closed, and an unopened indicating portion 34 that remains partially adhered to the base film side near the one end and allows the presence or absence of peeling to be determined.
Between the opening portion 35 and the unopened indication portion 34, there is a cut portion 32 inclined with respect to the opening direction, separating the two.

The inclined cut portion 32 has an inclined perforated cut 321,
A connecting portion 323 between the perforated cuts 321, which can be torn by a tear propagating from the cut end on the gripping portion 31 side to the next cut in the opening direction;
It consists of:
The cut portion 32 is a half-cut cut made from the adhesive layer 302 side. In the embodiment shown in FIG. 2-2, a slanted cut 321 in the form of a slanted perforation and
A guide portion 322 is formed by a cut having one end of each of the perforated inclined cuts 321 as a starting point and the other end inclined toward the gripping portion 31;
The cut portion 32 is constituted by the above.
The inclined cut portion having the above-mentioned guide portion 322 is configured by a weakened line in which multiple half-cut cuts are lined up from the adhesive layer 302 side in a perforated manner along a line inclined with respect to the opening direction, with the guide portion 322 facing the grip portion 31 side.

FIG. 2-3 is a diagram showing the film structure in the vicinity of the cut portion 32 in the open label 3. As shown in FIG.
3A shows the basic structure of an open-sided label 3, which is made up of a label base layer 301 and an adhesive layer 302 on its inner side.
In the peripheral region of the inclined cut 32 over the entire area of the inclined cut 321 and the guide portion 322, a shielding layer 304 is provided on the outer side of the label base material layer 301 in the peripheral region of the cut, and an adhesion-preventing layer 303 is provided on the inner side of the adhesive layer 302 in the peripheral region of the cut.

13B is an embodiment in which a stretched barrier base material layer 306 is provided via an adhesive layer 305 to the basic structure of the open-end label 3. The stretched barrier base material layer 306 is configured by laminating a biaxially stretched film to which a barrier layer such as a vinylidene coat, metal oxide or metal vapor deposition has been applied.
The barrier stretched substrate layer 306 can protect the shielding layer from deterioration or peeling due to rubbing or the like.

In these opening labels 3, the cut portion 32 is half cut from the adhesive layer 302 side with the guide portion 322 facing the grip portion 31 side from the adhesive layer 302 side, and the cut does not reach the shielding layer 304.
Therefore, when the opening label 2 is unopened, the shape of the notch cannot be seen at all from the outside in the peripheral area of the notch covered by the shielding layer 304 .

3A and 3B show a container opening 1 of the present invention, in which FIG. 3A is a plan view before opening, FIG. 3B is a plan view showing the opening process, and FIG. 3C is a vertical sectional view showing the opening process and a partially enlarged view thereof.
First, to open the container, the grip portion 31 is gripped, and the opening label 3 is pulled away from the container opening film 2 starting from the grip portion 31 to open the container.
Since the grip portion 31 has an anti-adhesion layer 303 on its inner surface as shown in FIG. 1-3, it can be easily peeled off from the container opening film portion 2 and gripped.
When the opening label 3 is lifted, the portion of the opening film 210 that becomes the film opening 21 is lifted while remaining adhered to the opening label 3, and only the outer peripheral edge of the opening film 210 of the container opening film portion 3 is peeled off from the opening label 3 and opened.

When opening, the tab portion 31 is torn from both ends at the incisions 32 inclined with respect to the opening direction, and is broken.
The unopened indication parts 34 on both sides of the tab 31 are strongly adhered to the container opening film part 2. In addition, the film of the film opening 21 (opening film 210) is adhered to the opening label 3, and the outer periphery of the film opening 21 is also adhered to the opening label.
When opening the label 3, when the tab 31 of the label 3 is lifted, a crack 37 runs in the opening direction from the tip of the base notch 36 at the tab 31 shown in FIG. 2-2, and reaches the first guide portion 322.
The base cut portion 36 is a cut that penetrates the entire thickness of the layer of the open-cut label 3. Therefore, the cut portion 32 is a cut that can be easily torn and start to break.
Because of this, when the force used to roll up and open the opening label causes the opening to proceed from the first guiding portion 322 to the inclined notch 321, and when it is opened up to the notch end 3211, in the connecting portion 323 between the inclined notch 321 and the next inclined notch 321, a crack 37 proceeds in the opening direction from the notch end 3211, and the crack proceeds to the next guiding portion 322, and the connecting portion 323 is torn along the perforated notches one after the other and opened.

In particular, the opening label 3 is provided with an adhesion suppressing layer 303 that suppresses the adhesive force between the opening label 3 and the container opening film part 2 around the edge of the film opening 21 by overlapping the inclined cut part 32 and the guide part in an area that covers the entire area, so that there is no slippage due to adhesion in the tearing direction. Therefore, the tearing proceeds smoothly in the opening direction without slippage in the tearing direction, and there is no tearing in an unexpected direction.
If it were torn in the middle, it would not be possible to open it wide and it would be impossible to reseal it, but since it can be stably torn at the cut portion 32, it can be opened and closed without any problems.

In this manner, in order to reseal the opened container opening 1, the opened opening label 3 is simply rolled up and returned to its original position, and the opening is resealed.
When the package is resealed, the unopened indication portion 34 and the opened portion 35 are brought together in the vicinity of the cut portion 32 that was once torn, but due to the tearing, they do not completely overlap.
For this reason, when the package is unopened, the shape of the cut cannot be seen at all from the outside in the peripheral area of the cut covered with the shielding layer 304, but the torn break line of the cut can be clearly seen.

FIG. 4 shows an application example in which the container opening of the present invention is utilized on one side to form a container.
FIG. 4-1 shows an example in which the container opening of the present invention is used in the center of the front side of a pillow-type packaging bag.
When used in a packaging bag container for wet tissues, etc., it can be easily opened and sealed freely even when repeatedly opened and closed.
In addition, since it is possible to immediately visually check whether the unopened indication portion is connected to the opened portion, it is ideal for ensuring safety and security.

FIG. 4-2 shows an application example of the present invention in which the container opening is an injection cup, or a container fused to a cup-shaped opening surface created by vacuum forming or pressure forming.
When fused to the opening of a cup-shaped container, a firm opening surface can be formed, making it easy to open, and even when sealed, the opening surface is firmly fixed and flat, making it easy to handle.

As the base layer of the opening label used in the present invention, it is particularly effective to use a biaxially oriented film. Biaxially oriented films are thin and highly flexible, and can be easily made flat, so they are less likely to wrinkle when opened and closed, resulting in problems such as gaps between the film and the opening of the container. Specifically, two-resin stretched polyethylene terephthalate film, two-resin stretched polyamide film, two-resin stretched polypropylene film, etc. can be used.

In the open-end label used in the present invention, the biaxially oriented base material layer used in the configuration having a barrier stretched base material layer may be a biaxially oriented film such as a two-resin stretched polyethylene terephthalate film, a two-resin stretched polyamide film, or a two-resin stretched polypropylene film, on which a polyvinylidene resin coating, a metal oxide such as silicon oxide, aluminum oxide, or titanium oxide, or a metal such as aluminum, chromium, or zinc is deposited, may be used.
However, the thickness of the barrier 2 resin stretched film is preferably 20 μm or less so that it can be torn intermittently.
The shielding printing layer can be made of a flaky fine powder having ultraviolet shielding properties, which is made by carrying an inorganic compound such as titanium oxide on the surface of a flaky substrate such as mica, or a shielding ink made by finely breaking up highly opacifying metal foil into pigments.

The substrate layer of the base film used in the container opening film portion of the present invention can be a biaxially oriented polyethylene terephthalate film, a biaxially oriented polypropylene film, a biaxially oriented polyamide film, paper, etc. Furthermore, these can also be used as a film vapor-deposited with a metal oxide such as silicon oxide, or a barrier film vapor-deposited with a metal such as aluminum.
Alternatively, a heat-sealed oriented polypropylene film or an antistatic non-oriented polypropylene film may be used, and the ends of the gusset or gusset may be fused to form a rigid package.

The sealant layer used in the container opening film portion of the present invention can be made of low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, unstretched polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-methacrylic acid copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, etc.

As a prototype, the following container opening was created and evaluated.
<Prototype example>
The material used for the open-end label was a polyvinylidene-coated biaxially oriented polypropylene film (thickness 20 μm) as a base material.
As the adhesive layer of the removable tack label, a label (thickness 100 to 110 μm) in which an acrylic adhesive was applied to a biaxially oriented polypropylene film was used.
The shielding printing layer was made of shielding ink made by finely breaking up metal foil with high concealing properties and turning it into pigment. It was locally applied to the cut area on the front side of the removable tack label using a printer.
As an anti-adhesion layer, a UV release varnish was used.
The base layer and the removable tack label were attached to each other using an ultraviolet (UV) lamination machine with an ultraviolet adhesive.
Using the above, a film stock roll was prepared as an opening label, consisting of (from the outside) vinylidene resin-coated biaxially oriented polypropylene film/ultraviolet adhesive/removable tack label.
Using this original sheet, an adhesion-preventing layer 303 made of ultraviolet-curing peelable overprint varnish was printed in a pattern on the adhesion-preventing sections of the gripping section 31 and the cut section 32, and the cuts and outline were pressed out to create an opening label 3 having the shape shown in Figure 2-2.

The material used for the container opening film portion was a polyethylene terephthalate film (thickness: 12 μm) as a base material.
As the sealant film, a multi-layer coextrusion film having a thickness of 60 μm and consisting of 6-nylon/saponified ethylene-vinyl acetate copolymer/ethylene-propylene copolymer containing antifogging agent was used.
The substrate and the sealant film were attached to each other using a urethane adhesive for dry lamination.
Using the above, a base film having a structure of biaxially oriented polyethylene terephthalate/adhesive/multi-layer barrier anti-fog sealant from the outside was prepared as a container opening film portion.
This original film was used to press the cut lines for the opening of the film, to produce a container opening film part having the shape shown in FIG. 2-1.
The opening label is adhered to cover the opening of the container opening film portion,

<Evaluation method>
As a test method for evaluating the unopened package revealing function, the following evaluation test was carried out.
Using prototype 1, as shown in Figures 3-2 and 3-3, the score line opening label 3 was peeled 180 degrees from the container opening film starting from the gripping portion 31 of the opening label 3 toward the hinge side where the film opening 21 is connected to the peripheral edge of the container opening film.
The unopened indication function was evaluated as good if the cut between the unopened indication portion and the opened portion did not tear in the wrong direction, but instead the crack in the connecting portion connected correctly and continuously from the end of the cut to the guide portion connecting to the next cut, and then to the inclined cut, and if both ends of the open label were torn between the unopened indication portion and the opened portion, and the unopened indication portion remained on the container opening film side.
In the cut section between the unopened indication section and the opened section, if the crack did not connect from the end of the previous cut to the next guiding section or the inclined cut section, and if part of the opened section remained in the container opening film section, or if the unopened indication section came off from the container opening film section when opened, it was marked as x.

<Evaluation Results>
The evaluation results of the unopened indication function were that all 10 evaluated products had unopened indication even after opening, and the results were ◯. In addition, even when resealed, the cut part was clearly visible, and it was possible to tell that the product had been opened.

From the above results, it was impossible to see the cut at all when the package was unopened, but once opened, the torn cut was clearly visible, clearly indicating that the package had been opened.

When the container opening of the present invention is first opened, not only can it be determined that it has been peeled off by the divided shielding portion, but also because the opening label has a shielding layer that overlaps the cut portion and covers its peripheral area, when the container is opened, the hidden cut portion becomes visible, making it clear from a distance that the container has been opened.
Furthermore, the inner surface of the opening label is an adhesive layer, so that even if the container opening is opened, it can be easily closed again, making it an openable and closable container opening.
The container opening of the present invention has a structure that is easy to mass-produce on a general production line, so it can be mass-produced at low cost. Furthermore, the present invention has great merits such as being easily applied to general packaging bags such as billow containers, and being easily applied to containers by attaching it to the opening of a cup.

1: Container opening 2: Container opening film 20: Base film 201: Base material layer (container opening film base material layer)
202: sealant layer 21: film opening 210: opening film 211: cut line (tongue-shaped cut line)
212: End of cut line 3: Open label 301: Label base material layer 302: Adhesive layer 303: Adhesive suppression layer 304: Shielding layer 305: Adhesive layer 306: Stretched base material layer with barrier properties 31: Gripping portion 32: Cut portion 321: Inclined cut line 3211: Cut end portion 322: Guiding portion 323: Connecting portion 34: Unopened indication portion 35: Opened portion 36: Root cut portion 37: Crack

Claims (5)

A container opening film portion including a base film having at least a substrate layer made of a stretched film and a sealant layer, the base film having a tongue-shaped cut line as a film opening;
an opening label that allows the film opening of the container opening film portion to be repeatedly opened and closed;
In a container opening having
The label can be opened by peeling the label from the base film to the vicinity of the other end starting from a gripping portion at one end of the label, the adhesion of which is inhibited by an adhesion-inhibiting layer,
The opening label is
An opening part for opening;
an unopened indicator that remains partially on the base film when the package is opened, thereby enabling determination of whether the package has been opened or not;
having
A container opening characterized by having a cut portion consisting of a half-cut perforation that is inclined toward the opening direction and easy to open between the opening portion and the unopened indication portion, a shielding layer on the outside of the label base layer in the peripheral area of the cut portion, and an adhesive-inhibiting layer on the inside of the adhesive layer in the peripheral area of the cut portion. The inclined cut portion separating the opening portion and the unopened indication portion is
With inclined perforated cuts,
A connecting portion between the perforated cuts, the tear of which propagates in the opening direction from the end of the cut on the gripping portion side to the next cut, and which can be torn;
It consists of:
2. The container opening according to claim 1, wherein the cut is a half-cut cut made from the adhesive layer side. The container opening according to claim 1 or 2, characterized in that a cut is made at the base of the tab of the opening label, toward the center of the first guide section, penetrating the base cut section in the opening direction. A container opening according to any one of claims 1 to 3, characterized in that the film opening of the container opening film part has a base in which both ends of the cut line are curved away from the opening direction. A packaging container having a container opening according to any one of claims 1 to 4.