JP7615722B2 - 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 tip of the cut when opening hits near the center of the cut, so if the lid was intentionally peeled off in a direction perpendicular to the beveled edge, there was a high risk that the tear would propagate from the cut end to the center of the lid material.

Patent No. 6171196

Therefore, the objective of the present invention is to obtain an opening that can be stably opened without causing a crack to develop in the center of the lid material being opened, regardless of the direction in which it is opened.

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 container can be opened by peeling the opening label from the base film to the vicinity of the other end starting from a gripping portion at one end of the opening label, the adhesion of which is inhibited by an adhesion-inhibiting layer,
The opening label is
An opening part for opening;
an unopened indicating portion that remains partially on the base film side when the package is opened, thereby enabling the presence or absence of peeling to be determined;
having
This container opening is characterized by having a cut portion inclined with respect to the opening direction between the opening portion and the unopened indication portion, and an adhesion-inhibiting layer overlapping the cut portion to reduce the adhesive force between the opening label and the container opening film portion around the opening.

When the container opening of the present invention is opened, it is possible to tell that the unopened indication portion remains and has peeled off, and since the cut portion is inclined in the opening direction and overlaps the adhesion prevention portion and the inclined cut portion, the cut portion can be opened without breaking in an unexpected direction.

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, and partially enlarged views thereof. 1A to 1C are a plan view of a container opening of the present invention before opening, a plan view and a side view of the container opening after opening, and a partially enlarged view thereof. 1A and 1B are diagrams showing the process of starting to open the container opening of the present invention by shifting the gripping portion of the opening label in an arbitrary direction by 45 degrees, 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 on the tab side beyond that is an unopened indication section 34, and on the base side of the opening label 3 is an unopened section 35 adhered thereto, and the film opening 21 of the base film and the outer periphery of the film opening are adhered thereto.
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 and an opening label 3 used in the container opening 1 of the present invention, and a partially enlarged view 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 incision 321,
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;
It consists of:
The inclined cut portion having the above-mentioned guide portion 322 is configured by a weakened line having multiple cuts arranged in a perforated pattern along a line inclined with respect to the opening direction, with the guide portion 322 facing the grip portion 31 side.

An adhesion suppression layer 303 that suppresses adhesion to the container opening film portion is provided on the adhesive layer side of the opening label 3, overlapping the area that covers the entire inclined cut 321 and the guide portion 322 of the inclined cut portion 32.

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 adhered to the opening label.
For this reason, when the tab 31 of the opening label 3 is lifted, a crack 37 runs in the opening direction from the tip of the root cut 36 at the tab 31 shown in Fig. 2-2 and reaches the first guide 322. When the opening proceeds from the first guide 322 to the inclined cut 321 by the force of opening, and is opened up to the cut end 3211, the crack 37 proceeds in the opening direction from the cut end 3211 at the connection 323 between the inclined cut 321 and the next inclined cut 321, and the crack proceeds to the next guide 322, and the connection 323 is torn and opened along the perforated cuts one after another.

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.

FIG. 4 is a diagram showing a state in which the opening direction is intentionally set significantly away from the direction of the film opening 21. In FIG.
When the grip portion 31 is gripped and the container is opened at an angle that is intentionally shifted significantly from the direction of the film opening 21, a crack first runs in the shifted opening direction from the tip of the base cut portion 36 at the grip portion 31. Even in this case, in the case of the container opening of the present invention, the crack reaches the first guide portion 322, advances from there to the inclined cut 321, advances again in the opening direction from the cut end portion 3211, advances to the next guide portion 322, and continues to break along the perforated cuts one after another, allowing the container to be opened without any problems.
In this way, when the opening direction is shifted, the angle of the inclined cut portion differs greatly between the left and right, and therefore the position at which the crack reaches the guide portion 322 in the opening direction from the cut end 3211 differs greatly between the left and right. However, as long as the angle is not shifted more than the angle 323 from the cut end 3211 toward both ends of the guide portion 322 shown in FIG. 2-2, the package can be opened without any problems.

FIG. 5 shows an application example in which the container opening of the present invention is utilized on one side to form a container.
FIG. 5-1 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. 5-2 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 label used in the present invention, it is particularly preferable to use a biaxially stretched film, which is thin and highly flexible and can be easily made flat, so that it is less likely to wrinkle when opened and closed, resulting in a gap between the container opening film and the film.
Specifically, two-resin stretched polyethylene terephthalate film, two-resin stretched polyamide film, two-resin stretched polypropylene film, etc. can be used.

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 1>
The material used for the open-end label was a polyvinylidene chloride-coated biaxially oriented polypropylene film (thickness: 20 μm) as a base material.
As the adhesive layer of the removable tack label, a film (thickness 100 to 110 μm) in which an acrylic adhesive was applied to a biaxially oriented polypropylene film was used.
As an anti-adhesion layer, a UV release varnish was used.
The base layer and the removable tack label were bonded together using an ultraviolet adhesive, and were then attached together using a UV laminator.
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 biaxially oriented polyethylene terephthalate film (thickness: 12 μm) as a base material.
As the sealant film, a multi-layer coextrusion film (thickness 60 μm) consisting of 6-nylon/saponified ethylene-vinyl acetate copolymer/ethylene-propylene copolymer containing antifogging agent was used.
A urethane adhesive for dry lamination was used to bond the substrate and the sealant film.
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 above-mentioned opening label was adhered to cover the opening of the container opening film portion to form prototype 1 of the container opening.

<Prototype Example 2>
The container opening film portion used was the same as that used in Prototype Example 1.
The open-open label used was the same as that of Prototype 1, except that it did not have the ultraviolet-curing peelable overprint varnish.
The above-mentioned opening label was adhered to cover the opening of the container opening film portion to form prototype 2 of the container opening.

<Evaluation method>
<Test method for evaluating the unopened display function>
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.

<Test method for evaluating breakage prevention function>
Starting from the gripping portion of the opening label, the score line opening label was peeled off 180 degrees from the container opening film in an arbitrary direction, as shown in Figure 4, which was shifted 45 degrees from the direction of the hinge side where the opening was connected to the periphery of the container opening film.
Ten pieces each of prototype 1 and prototype 2 were tested.
The breakage prevention function was evaluated as good if the cut between the unopened indication area and the opened area did not break in the wrong direction, but instead the crack in the connecting area connected correctly and continuously from the end of the cut to the guide area connecting to the next cut, and then to the inclined cut, and both ends of the opening label were torn between the unopened indication area and the opened area.
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 guide section or the inclined cut section, and if a part of the opened section remained in the container opening film section, it was marked as x.

<Evaluation Results>
<Results of evaluation of the unopened display function>
Of the 10 items evaluated, all remained unopened even after opening, giving the result a pass.
<Results of evaluation of breakage prevention function>
In prototype 1, all ten pieces were rated as "good."
However, in prototype 2, only one was marked as "good," while nine were marked as "bad."

From the above results, it was found that the unopened indicating portion can reliably indicate whether or not the package has been opened.
It was also confirmed that the adhesive-preventing portion prevents breakage, such as tearing in an unexpected direction along the cut, allowing for stable opening.

The container opening of the present invention can be resealed after opening because the inner surface of the opening label is an adhesive layer.
Moreover, when the package is first opened, it is possible to tell that the unopened indication part remains and has been peeled off, so safety can be easily determined by the presence or absence of the unopened indication. This means that if the unopened indication part is not torn off from the opening label, it can be guaranteed that the package is unopened.
Furthermore, since the cut portion is inclined with respect to the opening direction and the adhesion inhibiting portion overlaps the inclined cut portion, the cut portion does not break in an unexpected direction midway, and the package can be opened stably and reliably.
The container opening of the present invention is constructed so that it can be easily mass-produced on a general production line, and can be mass-produced at low cost. Furthermore, the present invention has great merits, such as its ease of application to general packaging bags such as billow containers, and its ease of application 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 layer 302: Adhesive layer 303: Adhesive-suppressing layer 31: Gripping portion 32: Cut portion 321: Inclined cut line 3211: Cut end 322: Guiding portion 323: Connecting portion 34: Unopened indication portion 35: Opened portion 36: Base cut portion 37: Crack

Claims (5)

A container opening film portion made of a base film having at least a substrate layer made of a stretched film and a sealant layer, the container opening film portion having a tongue-shaped cut line on one surface 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
Between the opening portion and the unopened indication portion, there is a cut portion inclined with respect to the opening direction, and an adhesion suppressing layer is overlapped with the cut portion to suppress adhesion between the opening label and the container opening film portion around the opening portion ,
The inclined cut portion separating the opening portion and the unopened indication portion is
With inclined perforated cuts,
A guide portion having one end of each of the perforated cuts as a starting point and the other end of the cut inclined toward the gripping portion;
It consists of:
The inclined cut portion having the induction portion is provided in a plurality of perforations inclined with respect to the opening direction, with the induction portion facing the gripping portion,
A container opening, characterized in that each of the perforations is located along a boundary between the opening portion and the unopened indication portion. 2. The container opening according to claim 1 , wherein the opening label capable of being repeatedly opened and closed comprises at least a substrate made of a stretched film, an adhesive layer, and an adhesion-preventing portion. 3. The container opening according to claim 1, wherein a base cut portion is provided at the base of the tab portion of the opening label in the opening label opening direction toward the center of the first guide portion. A container opening according to any one of claims 1 to 3 , characterized in that the film opening of the container opening film portion has a root 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 .

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