JP2023042823A - packaging bag - Google Patents

Abstract

[Problem] We propose a packaging bag with a resealable access opening and a structure that clearly indicates that the bag has been opened once. [Solution] The packaging bag 1 is obtained by manufacturing a base sheet 2 that includes a paper layer 4, has an OP varnish layer 7 as the outermost layer, and a sealant layer 3 as the innermost layer, has an access opening 10 for removing the contents on the top surface 12, and a transparent reclose label 20 that covers the access opening and has a resealable adhesive layer 23, has an OP varnish-free portion 8 with a closed shape on the base sheet, and has a half-cut portion 9 that is the same size as the OP varnish-free portion or smaller, reaches more than half the thickness of the paper layer, and is applied from the sealant layer side to a depth that does not penetrate the paper layer, and when the reclose label is peeled off, the half-cut portion adheres to the adhesive layer and a hole 13 is formed in the base sheet before the access opening is opened. [Selected Figure] Figure 1

Description

TECHNICAL FIELD The present invention relates to a packaging bag, and more particularly, to a packaging bag having a resealable opening and having an untampered revealing structure that reveals that it has been opened once it is opened.

An example of an application in which the contents are not used up at once even if the package is opened is a wet tissue package. A conventional wet tissue package such as that described in Patent Document 1 is provided with a resealable take-out opening. Since it is possible to reseal it, there were cases where it was not recognized that it had been opened.

Originally, products that have been opened once should not be sold, so in order to completely prevent this, it is necessary to further store the package in an outer bag and seal it, which may cause excessive packaging. was

There is also a method of sticking another unopened revealing label that can be torn off when the reclose label is opened so that it can be seen that the reclose label covering the take-out port has not been opened. According to this method, not only is it time-consuming to affix the label, but there is also the possibility of misalignment and missing pages, and it is also possible to prevent the unopened revealing label from functioning by carefully peeling it off.

JP-A-10-24972

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide a packaging bag having a resealable take-out opening and having an unopened revealing structure that makes it clear that the bag has been opened once it is opened.

As a means for solving the above problems, the invention according to claim 1 includes a paper layer, an OP varnish layer having releasability against an adhesive as the outermost layer, and a sealant layer as the innermost layer. A packaging bag obtained by making a sheet, having an outlet for taking out contents on the upper surface, and a transparent reclose label having a resealable adhesive layer covering the outlet. Then, in the base sheet of the part where the pressure-sensitive adhesive layer is present, between the opening tab of the reclose label and the tip of the outlet, a closed-shaped OP varnish-free part (OP varnish-free part ) is present, and has a size equal to or smaller than the OP varnish-free part, reaches more than half the thickness of the paper layer, and has a depth that does not penetrate the paper layer. The packaging bag is applied from the layer side, and when the reclose label is peeled off, the half-cut processed part adheres to the adhesive layer and a hole is formed in the base sheet before the outlet is opened. is.

The packaging bag according to the present invention is provided with a portion (OP varnish-free portion) on the upper surface that does not have an OP varnish layer that has releasability for the adhesive of the reclose label, and is half-cut from the back side. When the reclose label is peeled off, holes are formed in the base sheet, so that the opening can be clearly recognized at a glance.

Further, according to the invention of claim 2, a printed layer having adhesion to the pressure-sensitive adhesive is present between the paper layer and the OP varnish layer. is.

Further, the invention according to claim 3 is the packaging bag according to claim 1 or 2, wherein the base sheet and the reclose label have a gas barrier layer.

The packaging bag according to the present invention is provided with a portion (OP varnish-free portion) on the top surface that does not have an OP varnish layer that has releasability for the adhesive of the reclose label, and is half-cut from the back side to a closed shape. As a result, when the reclose label is peeled off, a hole is formed in the base sheet. Even if the reclose label is reattached to the hole, the hole does not return to its original state, so that the unsealed product can be clearly recognized, and unintentional purchase of the unsealed product can be prevented.

Since the half-cut processed part is applied from the back side, it is difficult to see from the front side. For this reason, since the hole that is generated is noticed only after peeling off the reclose label, it also leads to a deterrent effect.

As in the invention according to claim 2, when there is a printed layer having adhesiveness to the adhesive between the paper layer and the OP varnish layer, the effect of making the half-cut processed part difficult to see , printing can be expected to have the effect of notifying that this part is unopened.

When the base sheet and the reclose label have a gas barrier layer as in the third aspect of the invention, long-term storage stability of the contents can be expected.

FIG. 1 is a perspective view showing one embodiment of a packaging bag according to the present invention. 2 is an explanatory plan view showing the upper surface of the packaging bag shown in FIG. 1. FIG. FIG. 3 is an explanatory plan view of the base sheet on the upper surface of the packaging bag shown in FIG. 1 in an unopened state. 4 is an explanatory plan view showing a reclose label of the packaging bag shown in FIG. 1. FIG. FIG. 5 is an explanatory plan view showing the base sheet in a state where the reclose label of the packaging bag shown in FIG. 1 has been peeled off and resealed. FIG. 6 is a cross-sectional explanatory view showing an example of the layer structure of the reclose label of the packaging bag according to the present invention. FIG. 7 is a cross-sectional explanatory view showing an example of the layer structure of the base sheet of the packaging bag according to the present invention. 8 is a cross-sectional explanatory view showing a state in which the reclose label shown in FIG. 6 is adhered to the base sheet shown in FIG. 7. FIG. FIG. 9 is a cross-sectional explanatory view showing a state in which the reclose label is peeled off from the state of FIG. 8, and shows a state in which a hole is formed in the base sheet.

Hereinafter, the packaging bag according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing one embodiment of a packaging bag 1 according to the present invention. FIG. 2 is an explanatory plan view showing the upper surface 12 of the packaging bag shown in FIG. FIG. 3 is an explanatory plan view of the base sheet 2 on the upper surface of the packaging bag shown in FIG. 1 in an unopened state.

FIG. 4 is an explanatory plan view showing the reclose label 20 of the packaging bag 1 shown in FIG. FIG. 5 is an explanatory plan view showing the base sheet 2 in a state where the reclose label 20 of the packaging bag 1 shown in FIG. 1 has been peeled off and resealed.

FIG. 6 is a cross-sectional explanatory view showing an example of the layer structure of the reclose label 20 of the packaging bag 1 according to the present invention. FIG. 7 is a cross-sectional explanatory view showing an example of the layer structure of the base sheet 2 of the packaging bag 1 according to the present invention.

Further, FIG. 8 is a cross-sectional explanatory view showing a state in which the reclose label 20 shown in FIG. 6 is adhered to the base sheet 2 shown in FIG. FIG. 9 is an explanatory cross-sectional view showing a state in which the reclose label 20 has been peeled off from the state of FIG. The structure and function of the packaging bag according to the present invention will be described in detail below with reference to these drawings.

The packaging bag 1 according to the present invention includes a paper layer 4, has an OP varnish layer 7 having peelability to an adhesive as the outermost layer, and is obtained by making a base sheet 2 having a sealant layer 3 as the innermost layer. The packaging bag has a top surface 12 with an outlet 10 for taking out the contents, and has a transparent reclose label 20 with a resealable adhesive layer 23 covering the outlet 10.

At the intermediate position between the opening tab 24 of the reclose label 20 and the tip of the outlet 10, the base sheet 2 in the portion where the pressure-sensitive adhesive layer 23 is present has a closed-shaped OP varnish-free portion ( A closed shape having an OP varnish-free portion 8), having a size equal to or smaller than that of the OP varnish-free portion 8, reaching more than half the thickness of the paper layer 4, and having a depth that does not penetrate the paper layer 4. is characterized in that the half-cut processed portion 9 is applied from the sealant layer 3 side.

When the reclose label 20 is peeled off, the half-cut processed portion 9 adheres to the adhesive layer 23 and the holes 13 are formed in the base sheet 2 before the outlet 10 is opened. It is recognized as

Materials used for the packaging bag according to the present invention are described below. As shown in FIG. 7, the base sheet 2 has a paper layer 4 at its center, and a print layer 6 and an OP varnish layer 7 provided on the surface side of the paper layer 4 .

The paper layer 4 is not particularly limited, and may be selected in consideration of printability, sanitation, and the like. Specifically, coated paper, fine paper, bleached kraft paper, matte paper, Kent paper, art post paper, matte post paper, and the like are used.

The OP varnish layer 7 must be releasable from the adhesive of the reclose label 20 . However, from the viewpoint of securing the resealability of the reclose label 20, too strong peelability is not preferable.

The base sheet 2 is provided with a portion (OP varnish-free portion 8) where no OP varnish layer exists. The OP varnish-free portion 8 may have any shape, such as a circle, an ellipse, a square, or a star, as long as it is a closed shape.

The OP varnish non-layer portion 8 of the base sheet 2 has a size equal to or smaller than that of the OP varnish non-layer portion 8, reaches more than half the thickness of the paper layer 4, and has a depth that does not penetrate the paper layer 4. Half-cut processing of a closed shape is performed from the sealant layer side to form a half-cut processing portion 9 . As with the OP varnish-free portion 8, the half-cut portion 9 may have any shape such as a circle, an ellipse, a square, or a star as long as it is a closed shape.

Although the printed layer 6 is not essential, it is necessary to assume that the printed layer 6 is present since some kind of display is generally made on the surface side. When the printed layer is exposed in the OP varnish-free portion 8, the adhesive layer 23 of the reclose label 20 must adhere to it.

The sealant layer 3 is the innermost layer of the base sheet 2 and is a layer responsible for heat sealability required for bag making. The sealant layer 3 may be in the form of a film or a coating film. It may also serve as a gas barrier layer, which will be described later.

Although the gas barrier layer 5 is not essential, it helps to improve the storage stability of the contents. As the gas barrier layer 5, a polyvinylidene chloride film, a polyvinyl alcohol film, an ethylene-vinyl alcohol copolymer film, a gas barrier nylon film, a gas barrier polyethylene terephthalate (PET) film or the like, or a PET film or the like containing aluminum or the like is used. A metal-deposited metal film, an inorganic oxide-deposited film obtained by vapor-depositing an inorganic oxide such as aluminum oxide or silicon oxide on a PET film, a polyvinylidene chloride coating, or a coating containing a water-soluble resin and an inorganic layered compound. A gas barrier coating layer such as a resin layer formed by reacting a metal alkoxide or a hydrolyzate thereof with an isocyanate compound, or a metal foil such as an aluminum foil can be used. A form that also serves as the aforementioned sealant layer may be used.

An outlet 10 is provided in the base sheet 2 by full penetration or semi-penetration processing using a cutting tool. The outlet 10 is opened at the same time when the reclose label 20 is peeled off by holding the opening knob 24, and is sealed by resealing the reclose label.

FIG. 6 is a cross-sectional explanatory view showing an example of the layer structure of the reclose label 20. As shown in FIG. In this example, a substrate layer 21, a gas barrier layer 22 and an adhesive layer 23 are provided. An adhesive layer for bonding the base material layer 21 and the gas barrier layer 22 together is omitted.

Various synthetic resin films can be used as the base material layer 21, but since they require a certain degree of stiffness and strength, oriented polypropylene resin (OPP), polyethylene terephthalate resin (PET), and polymethyl methacrylate resin (PMMA) are used. , ionomer resins, polyamide resins such as nylon-6 and nylon-66, and various synthetic resin films such as polycarbonate resins (PC).

As for the gas barrier layer 22, as described above, since transparency is required, a metal deposition film or metal foil cannot be used.

The adhesive layer 23 is selected from acrylic resin-based adhesives, urethane-based adhesives, silicone-based adhesives, and the like. In general, it is easy to use acrylic resin-based adhesives, which can be designed from weak to strong adhesive types, have a high degree of freedom in material design, have excellent transparency, and have excellent weather resistance and heat resistance.

8 and 9 are cross-sectional explanatory views showing how holes 13 are formed in the base sheet 2 when the reclose label 20 is peeled off in the packaging bag 1 according to the present invention. In FIG. 8, the adhesive layer 23 of the reclose label 20 is adhered to the top surface 12 of the base sheet 2 . Next, as shown in FIG. 9, when the reclose label 20 is peeled off, the adhesive layer 23 is peeled off in the portion where the OP varnish layer 7 exists, but the adhesive layer 23 is peeled off in the portion 8 without the OP varnish. It adheres to the printed layer 6 and lifts the entire base sheet 2 .

At this time, since the part 8 without OP varnish is subjected to a half-cut processing part 9 reaching more than half the thickness of the paper layer 4 from the sealant layer 3 side, the remaining paper layer 4 is removed, A hole 13 is formed.

It has been experimentally confirmed that if the depth of the half-cut portion 9 does not reach half the thickness of the paper layer 4, the hole formation may become unstable. . The packaging bag according to the present invention will be specifically described below based on Examples and Comparative Examples.

<Example 1>
As a paper layer, one-sided glossy kraft paper (OK Blizzard manufactured by Oji Paper Co., Ltd., basis weight: 50 g/m ² ) was used, and a printed layer was formed on the surface of this paper. Gratone PCN manufactured by Sakata Inx Co., Ltd. was used as the printing ink. UPPS medium manufactured by Toyo Ink Co., Ltd. was used as the OP varnish. As the sealant layer, a multilayer barrier anti-fogging sealant (Damiron V441, 60 μm, manufactured by Mitsubishi Chemical Corporation) was used. The layer structure is a nylon/EVOH/ethylene propylene copolymer coated with an anti-fogging agent.

Three layers of printed and OP varnished paper, a 12 μm-thick polyethylene terephthalate resin film (Ester E5102 manufactured by Toyobo Co., Ltd.), and a sealant film were laminated by a dry lamination method to form a base sheet. TM242A (main agent) and TM242B (curing agent) manufactured by Toyo-Morton Co., Ltd. were used as dry lamination adhesives.

As a reclose label, a 20 μm-thick barrier PP film (Seneshi KOP 1000 manufactured by Daicel Miraise Co., Ltd.) was used as a base layer. A removable tack label (CL BOPP/R1490 manufactured by Avery Dennison Japan) was used as the adhesive layer. This is obtained by forming an acrylic adhesive layer on a stretched PP resin film. An ultraviolet curable adhesive (Acrytac L315 manufactured by No Tape Industry Co., Ltd.) was used for bonding the two. An anti-paste coat (UV peel OP varnish manufactured by T&K TOKA) was applied to the opening tab to inhibit the adhesiveness of the adhesive layer.

Using these materials, a packaging bag having an upper surface shaped as shown in FIG. 2 was produced. Both the part without OP varnish and the half-cut part are circular. The half-cut depth in the half-cut portion reached 99% of the thickness of the entire paper layer.

For the finished packaging bag, when the reclose label was peeled off, the states of the part without OP varnish and the half-cut processed part were observed and evaluated.

<Example 2>
A packaging bag was produced and evaluated in the same manner as in Example 1, except that the half-cut depth in the half-cut portion reached 80% of the thickness of the entire paper layer.

<Example 3>
A packaging bag was produced and evaluated in the same manner as in Example 1, except that the half-cut depth in the half-cut portion reached 60% of the thickness of the entire paper layer.

<Example 4>
A packaging bag was produced and evaluated in the same manner as in Example 1, except that the depth of half-cutting in the half-cutting portion reached 50% of the thickness of the entire paper layer.

<Comparative Example 1>
A packaging bag was produced and evaluated in the same manner as in Example 1, except that the depth of half-cutting in the half-cutting portion reached 45% of the thickness of the entire paper layer.

<Comparative Example 2>
A packaging bag was produced and evaluated in the same manner as in Example 1, except that the depth of half-cutting in the half-cutting portion reached 35% of the thickness of the entire paper layer.
The above results are summarized in Table 1.

From the results in Table 1, it was confirmed that the packaging bag according to the present invention had an irreversible unopened structure.

Reference Signs List 1 Packaging bag 2 Base sheet 3 Sealant layer 4 Paper layer 5 Gas barrier layer 6 Printing layer 7 OP varnish layer 8 No OP varnish Portion 9 Half-cut processing portion 10 Outlet 11 Seal portion 12 Upper surface 13 Hole 20 Reclose label 21 Base material layer 22 Gas barrier Layer 23... Adhesive layer 24... Opening tab

Claims (3)

A packaging bag obtained by making a base sheet including a paper layer, having an OP varnish layer having releasability against an adhesive as the outermost layer, and a sealant layer as the innermost layer,
Having an outlet for taking out the contents on the top surface,
having a transparent reclose label with a resealable adhesive layer covering the outlet;
Between the opening tab of the reclose label and the tip of the outlet, there is a closed portion of the base sheet where the pressure-sensitive adhesive layer is present and is not coated with OP varnish (OP varnish-free portion). exists and
Half-cut processing of a closed shape with a size equal to or smaller than the OP varnish-free portion, reaching more than half the thickness of the paper layer, and a depth that does not penetrate the paper layer is applied from the sealant layer side. and
A packaging bag, characterized in that, when the reclose label is peeled off, the half-cut portion adheres to the pressure-sensitive adhesive layer and a hole is formed in the base sheet before the outlet is opened. 2. The packaging bag according to claim 1, wherein a printed layer having adhesion to said adhesive is present between the paper layer and the OP varnish layer. 3. The packaging bag according to claim 1, wherein the base sheet and the reclose label have a gas barrier layer.

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