JP4955339B2 - Lid and packaging body and method for producing the packaging body - Google Patents

Description

  The present invention relates to a lid material in which an inner layer and an outer layer suitable for use in sealing containers containing foods, beverages, fragrances, deodorants and the like are detachably laminated, and packaging using the lid material The present invention relates to a body and a method for producing the package.

As described in Patent Documents 1 and 2, a lid member in which an outer layer and an inner layer are laminated so as to be peelable through an adhesive is already known.
Such a lid material is suitable for sealing an opening of a container in which food, beverages, fragrances, deodorants and the like are stored.

That is, in a state where the outer layer and the inner layer are bonded, if the container is sealed with a lid made of this lid material, the stored item will not leak to the outside, and if the outer layer is made of a material having a barrier property, Since deterioration can be prevented, it is suitable for storage.
When the outer layer is peeled off from the inner layer, the inner layer remains adhered to the container opening. Therefore, when the stored item is a fragrance or a deodorant, a plurality of small through holes provided in the inner layer in advance or A notch (see FIG. 3 of Patent Document 1) appears, through which the fragrance or deodorant diffuses into the outside air and enters the use state.
In addition, when the stored item is a food or beverage, a partial opening (see FIG. 4 of Patent Document 2) provided in advance in the inner layer or formed along with the peeling of the outer layer appears, through which a straw or spoon is inserted. It will be in a state ready for eating.

At this time, since the size of the partial opening, the through hole, and the cut provided in the inner layer can be adjusted, it is possible to prevent dust from entering the container by reducing the size.
For this reason, when the stored item is a deodorant or fragrance, it looks good without dust accumulating in the container, and dust does not adhere to the surface of the deodorant or fragrance. Deodorant performance and the like are not deteriorated.
Further, when the stored item is a food or beverage, the food or beverage is not easily spilled, and it is hygienic without dust adhering thereto.

However, such a lid material has difficulty in controlling the adhesive strength between the outer layer and the inner layer, and requires a complicated coating process in which a weak adhesive and a strong adhesive are combined (FIG. 6 of Patent Document 1). And FIG. 1 of Patent Document 2).
For this reason, if this adhesive strength control varies, the adhesive strength is too strong and the outer layer cannot be easily peeled by hand, or conversely, the adhesive strength is too weak and the outer layer is peeled inadvertently (selfishly). There was a problem that.
In addition, when heat-sealing the lid made of this lid material to the opening flange of the container, heat is applied to these weak and strong adhesives or other adhesives, and the adhesive strength is increased, so that the outer layer is peeled off. There was a problem that became more difficult.
Japanese Patent No. 3030325 JP-A-5-270545

  Therefore, according to the present invention, the outer layer and the inner layer can be easily and stably peeled without requiring a complicated process such as controlling the adhesive strength by the adhesive in the cover material formed by laminating the inner layer and the outer layer. It is possible to provide means that can be laminated on the outer surface of the container, and means that the outer layer can be easily peeled by hand without causing poor peeling even when the lid made of the lid is heat-sealed to the opening flange of the container at a high temperature. And

  In order to solve the above-described problems, in the present invention, the outer layer has a polyethylene resin layer at the interface with the inner layer, and the outer layer has a polyethylene resin layer and an inner layer. Are formed to be capable of interfacial peeling.

In this way, since the outer layer and the inner layer are directly laminated in a state where they can be peeled off at the interface, it is not necessary to use a separate adhesive, and therefore, complicated processes such as controlling the adhesive strength are not required. It can be easily and stably laminated in a stable state.
In addition, even if the lid made of this lid material is heat-sealed to the opening flange of the container at a high temperature, no adhesive is used at the interface between the outer layer and the inner layer, so that the peel strength does not change and the peel failure It can be easily peeled off by hand without causing any trouble.

  More specifically, in a lid formed by laminating an inner layer and an outer layer, the outer layer has a polyethylene-based resin layer at the boundary with the inner layer, the inner layer is a base material layer made of a stretched polypropylene film, and thermal adhesiveness It is assumed that it has at least a sealing layer made of resin, and this sealing layer constitutes an outer surface heat sealing surface, and the outer polyethylene-based resin layer and the inner layer are formed so as to be capable of interfacial peeling.

  Here, the base layer made of a stretched polypropylene film was provided on the inner layer in order to maintain sufficient strength as a lid material by itself, even after the outer layer was peeled off, and a seal made of a thermoadhesive resin The layer was provided in order to heat seal the lid to the opening flange of the container.

  If the inner layer is provided with one or a plurality of through holes penetrating in the thickness direction, a partial opening can be easily formed at low cost by peeling the outer layer from the inner layer.

  If the interface peel strength between the outer polyethylene-based resin layer and the inner layer is 0.02N / 15mm to 0.5N / 15mm, it can be easily peeled by hand, and the outer layer can be peeled inadvertently (selfishly) There is no worry to do.

  If the inner layer has a butene-containing polypropylene resin layer at the boundary with the polyethylene resin layer of the outer layer, it becomes easy to suppress variation in interfacial peel strength and keep it within a certain range.

When a stored item is stored in a resin container having a flange in the opening, and a ring seal is applied to the upper surface of the flange by applying a sealing layer of the inner cover layer, the ring sealed portion is formed. Because the inner layer of the lid becomes brittle, even if the inner layer and outer layer of the outer edge portion (mainly tab) of the lid are gripped at the same time, the inner layer breaks at the ring seal portion and the inner side from the ring seal remains in the container opening. There is no risk of peeling the entire inner layer from the flange together with the outer layer.
Therefore, like a lid using a conventional adhesive, in order to prevent the inner layer and the outer layer from being peeled from the container opening at the same time, there is no need to separate the inner layer and the outer layer of the tab portion, and it is ensured. Only the outer layer can be peeled from the flange.

  Further, a convex part or a concave part is provided on a part or all of the upper surface of the flange of the resin container containing the stored items, and a heat seal is applied to the upper surface of the flange by applying an inner sealing layer of the lid made of the lid material. When the package is formed, the inner layer of this portion becomes weak because the lid is pressed by a convex portion or the like at the time of sealing, so that the same effect as that in the case of ring sealing can be achieved.

  In manufacturing the package, if the temperature of the heat seal is 210 ° C. to 240 ° C., the ring seal portion of the inner lid layer and the portion adhering to the convex portion or concave portion of the container are sufficiently weakened, and the lid (outer layer) ), The inner layer is not peeled off from the container opening, and the physical strength of the outer lid layer is not affected, and the peel strength is not changed.

  Adhering a lid made by laminating an inner layer and an outer layer, the outer layer having a polyethylene-based resin layer at the interface with the inner layer, and forming the outer-layer polyethylene-based resin layer and the inner layer so that the interface can be peeled off. Without requiring a complicated process such as controlling the strength, it can be easily and stably laminated in a peelable manner.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the lid 10 according to the first embodiment includes an inner layer 11 and an outer layer 12, the inner layer 11 includes a base material layer 11 a and a seal layer 11 b, and the outer layer 12 includes a base material. The base layer 11a of the inner layer 11 and the polyethylene resin layer 12b of the outer layer 12 are laminated so as to be peelable at the interface.

The base material layer 11a of the inner layer 11 is formed from a stretched polypropylene film (OPP film, stretched PP) so as not to be inadvertently broken when the outer layer 12 is peeled off or after the outer layer 12 is peeled off. .
The stretched polypropylene film preferably has a thickness of 12 μm to 120 μm because it is not bulky and has sufficient strength.

The sealing layer 11b of the inner layer 11 is formed from a heat-adhesive resin so that the lid member 10 can be heat sealed to an opening of a container 40 described later.
The type of the heat-adhesive resin is not particularly limited. For example, unstretched polypropylene (CPP), polyethylene, ionomer resin, ethylene-acrylic acid copolymer, ethylene-propylene block copolymer, styrene, polyester, ethylene A vinyl acetate copolymer (EVA) etc. can be mentioned, Of course, a commercially available sealant film can also be used.
The thickness of the seal layer 11b is not particularly limited, but is usually about 2 μm to 60 μm.
Moreover, the lamination | stacking method in particular of the base material layer 11a and the sealing layer 11b is not restrict | limited, Various coating methods, the dry laminating method using the dry laminating adhesive agent, etc. can be mentioned.

The base layer 12a of the outer layer 12 is not particularly limited, and paper, a resin film, an aluminum foil, or the like can be used, and printing, coloring, or the like is performed on the front and back surfaces or the intermediate layer of the base layer 12a as necessary. You may give it.
In particular, as the base material layer 12a, at least one selected from a polyethylene terephthalate film (PET film), a polybutylene terephthalate film (PBT film), a polyethylene naphthalate film (PEN film), an aluminum foil, and an inorganic oxide vapor deposition film is used. Is preferable from the viewpoints of strength, cost, barrier properties and the like.
Of course, two or more of the same or different types of films, aluminum foils and the like may be laminated.
Further, the thickness of the base material layer 12a is not particularly limited, but usually about 12 μm to 200 μm is preferable because it is not bulky and has sufficient strength.

  The polyethylene-based resin layer 12b may be selected from high-density polyethylene, low-density polyethylene, linear low-density polyethylene, and the like. Among these, particularly low-density polyethylene (LDPE) is used for interfacial peelability. It is preferable because it is excellent.

The inner layer 11 and the outer layer 12 may be laminated by a heat lamination method, an extrusion method, or the like through the polyethylene resin layer 12b of the outer layer 12.
When this heat lamination method is adopted, the temperature is preferably 80 to 130 ° C.
This is because if the temperature is less than 80 ° C., sufficient adhesion strength cannot be expected due to poor adhesion between the inner layer 11 and the outer layer 12, and if the temperature exceeds 130 ° C., the seal layer 11b of the inner layer 11 starts to melt and adheres to and desorbs from the heat roll. This is because a stable laminate cannot be expected.
On the other hand, when the extrusion method is employed, since a cooling roll is usually used, extrusion lamination may be performed at a relatively high temperature, for example, about 300 ° C.

The peel strength between the polyethylene-based resin layer 12b of the outer layer 12 and the base material layer 11a of the inner layer 11 is preferably in the range of 0.02 N / 15 mm to 0.5 N / 15 mm, and when set within this range, the polyethylene-based of the outer layer 12 The peeling performance at the interface between the resin layer 12b and the base material layer 11a of the inner layer 11 is good.
This is because if the peel strength is lower than 0.02 N / 15 mm, the outer layer 12 may inadvertently peel from the inner layer 11 during the process or during transportation of the product, while the peel strength is higher than 0.5 N / 15 mm. It is because there exists a possibility that it cannot peel smoothly by hand.

As shown in FIG. 2, the lid member 20 according to the second embodiment includes an inner layer 21 and an outer layer 22, and the inner layer 21 includes a base material layer 21 a, a seal layer 21 b, and a butene-containing polypropylene (butene-containing PP) resin. The outer layer 22 includes a base layer 22a and a polyethylene resin layer 22b, and the butene-containing PP resin layer 21c of the inner layer 21 and the polyethylene resin layer 22b of the outer layer 22 can be peeled at the interface. In such a state, they are laminated.
Here, since the base material layer 21a and the sealing layer 21b of the inner layer 21 and the base material layer 22a and the polyethylene resin layer 22b of the outer layer 22 are the same as those in the first embodiment, the description thereof is omitted.

As described above, the butene-containing polypropylene resin layer 21c is laminated between the base material layer 21a of the inner layer 21 and the polyethylene-based resin layer 22b of the outer layer 22, and therefore, there is a variation in the peel strength of the lid member 10. It is kept low.
In consideration of strength and the like, the butene-containing polypropylene resin layer 21c preferably has a thickness of about 1 μm to 15 μm, and the butene content is about 1% to 10% by weight of the butene-containing polypropylene resin layer 21c. Is preferred.
The butene-containing polypropylene resin layer 21c may contain a polyethylene resin in an amount of several weight percent, for example, about 1.5 weight percent for the purpose of adjusting the adhesive strength with the polyethylene resin layer 22b.

Although the structure of the lid | cover materials 10 and 20 concerning embodiment is as above, in addition to this, a reinforcement resin layer, a barrier layer, and an overcoat in arbitrary positions of the inner layers 11 and 21 and the outer layers 12 and 22 as needed. An anchor coat, primer coat, printing, coloring, anti-slip coat, light-shielding layer, anti-fogging agent coat, lubricant coat and the like may be laminated.
Also, the laminating method is not particularly limited, and a dry laminating method, a wet laminating method, a heat laminating (thermal laminating) method, a coextrusion method, an extrusion laminating method and the like can be employed.

Using these lid members 10 and 20, the package 1 according to the embodiment as shown in FIG. 3 is produced.
The package 1 includes a lid 30 composed of an inner layer 31 and an outer layer 32 formed by punching the lid materials 10 and 20 into a circle with tabs 33, a container 40, and a deodorant 50.

  As illustrated, the inner layer 31 of the lid 30 is provided with a through hole 31a penetrating the front and back by punching or the like, and the hole diameter is preferably about 1 mm to 10 mm.

The container 40 is a known resin container, and includes a circular bottom surface 41, a peripheral surface 42 that spreads and rises from the periphery of the bottom surface 41, and a flange 43 that projects horizontally from the upper edge of the peripheral surface 42.
The deodorant 50 is stored in the storage space of the container 40, and the lid 30 made of the lid materials 10 and 20 is ring-sealed (line sealed) on the flange 43 of the container 40.
As the synthetic resin container 40, a container made of polyester, polystyrene, polypropylene, vinyl chloride, or polyethylene is particularly preferable because it is inexpensive and easy to heat seal.
In place of the synthetic resin container 40, for example, a known paper container, resin container, glass container, or metal container may be used.

Here, as shown in FIG. 5, the ring seal uses a ring-shaped hot plate 60 having a convex (or concave) cross-sectional shape on the top surface of the flange 43 at the opening edge of the container 40, and a cross section of the thermal bonding portion. Is heat-sealed so as to have a concave (or convex) shape.
Other heat seal (ring seal) conditions may be appropriately selected from a known range. Particularly, the seal temperature (hot plate temperature) is 210 to 240 ° C., the pressure is about 50 kg / cup to 150 kg / cup, and the time is 0.5. It is preferable to set it to about 5 seconds.
Such a range is suitable when the heat seal temperature is less than 210 ° C., the inner layer is not completely broken at the ring seal portion, and the inner layer is opened with a part of the inner layer adhered to the outer layer. This is because it is inadvertently broken, and the broken portion becomes an unexpected opening, resulting in loss of commercial value.
On the other hand, when the heat seal temperature exceeds 240 ° C., the polyethylene resin laminated between the inner layer and the outer layer starts to melt due to the residual heat of the hot plate, causing thermal wrinkles and floats, which hinder the appearance and performance. Because.

In the case of ring sealing, in the embodiment, the hot plate 60 is used as shown in FIG. 5, but it may be sealed by ultrasonic heating or induction heating.
Further, instead of the ring seal, a convex portion or a concave portion may be formed on at least a part of the upper surface (heat seal surface) of the container 40 flange 43, and the lid members 10 and 20 may be heat sealed here.

The structure of the package 1 is as described above. As shown in FIGS. 3 and 4, when the tab 33 provided in advance on the lid 30 is grasped with a finger and pulled in the opening direction, first, outside the ring seal portion 34, The outer layer 32 and the inner layer 31 are separated from the container 40 while being laminated, and then the inner layer 31 is broken along the ring seal portion 34. Remains in the opening.
Therefore, as shown in FIG. 5, the outer layer 32 and the inner layer 31 outside the ring seal portion 34 are finally peeled from the container 40, and only the inner layer 31 inside the ring seal portion 34 remains on the opening of the container 40.
In this way, the portion of the through hole 31a provided in the inner layer 31 is partially opened, from which the deodorant component of the deodorant 50 is diffused to the outside air and is put into use.

In the embodiment, the stored item in the container 40 is the deodorant 50. However, the present invention is not limited to this, and a fragrance, a chemical, a food, a beverage, or the like may be used.
In the embodiment, the through hole 31a is provided in the inner layer 31 of the lid 30. However, instead of this, a cut, a perforation, a half cut, or the like may be provided.
When performing perforation and half-cutting, it is preferable to adjust the breaking strength so that, when the outer layer of the lid 30 is peeled off, these portions are broken to form partial openings.
When the stored item in the container 40 is the deodorant 50 or the fragrance, the inner layer 31 may be formed from a material having air permeability without providing the partial openings in the inner layer 31.

  Further detailed examples and comparative examples are given to further clarify the features of the present invention.

As examples and comparative examples, lid materials having the following configurations are prepared.
The cover material of the example is formed by laminating an outer layer material and an inner layer material, and the outer layer material is formed by bonding and laminating an outer layer base material and low-density polyethylene via an anchor coat agent, and the inner layer material is formed of an inner layer base material and The heat-adhesive resin is bonded and laminated through an adhesive.
The cover material of the comparative example is formed by laminating an outer layer material and an inner layer material via an adhesive. The outer layer material is composed of a single layer of an outer layer base material, and the inner layer material is sequentially separated from the interface with the outer layer material. It is formed by laminating an inner layer base material / adhesive / thermal adhesive resin.

( Reference Example 1, Example 2 to Example 3)
Using a 25μm OPP film with corona treatment on one side as the inner layer base material, 10 parts by weight of LX500 made by Dainippon Ink & Chemicals, Inc. and 1 part by weight of KW75 made by the company as a curing agent are blended into a two-part curable adhesive. This adhesive was diluted with ethyl acetate, and then applied to the corona-treated surface of the previous OPP film by a gravure method so that the weight after drying was 3.5 g / m ² .
A 30 μm unstretched polypropylene film CF3301 manufactured by Toray Film Processing Co., Ltd. was bonded as a heat-adhesive resin with a 60 ° C. heat roll, and cured at 40 ° C. for 3 days.
The inner layer material was preliminarily punched with a diameter of 2 mm.
Further, a urethane anchor coating agent was applied and dried in advance on a 25 μm PET film as an outer layer base material, and a low density polyethylene resin L705 manufactured by Sumitomo Chemical Co., Ltd. was extruded and coated at a thickness of 15 μm.
The outer layer material was heated with a 100 ° C. heat roll, the low-density polyethylene resin layer was semi-melted, and thermally bonded (weakly bonded) to the OPP surface of the inner layer material to prepare a lid material.
And this lid | cover material was punched out in the shape with a diameter 76mm tab, and the lid | cover was produced.

Example 4
Using 25μm OPP film of expanded polypropylene film co-extruded with butene-containing polypropylene resin and polypropylene resin as the inner layer base material, LX500 made by Dainippon Ink & Chemicals, Inc. as the main ingredient, 10 parts by weight of KW75 made by the company as a curing agent Partly blended and used as a two-component curable adhesive, diluted with ethyl acetate and dried on the polypropylene surface of the previous OPP film by gravure method so that the weight after drying is 3.5 g / m ² Application and drying were performed.
A 30 μm unstretched polypropylene film CF3301 manufactured by Toray Film Processing Co., Ltd. was bonded as a heat-adhesive resin with a 60 ° C. heat roll, and cured at 40 ° C. for 3 days.
The inner layer material was preliminarily punched with a diameter of 2 mm.
Further, a urethane anchor coating agent was applied and dried in advance on a 25 μm PET film as an outer layer base material, and a low density polyethylene resin L705 manufactured by Sumitomo Chemical Co., Ltd. was extruded and coated at a thickness of 15 μm.
The outer layer material was heated with a 100 ° C. heat roll, the low-density polyethylene resin layer was semi-melted, and thermally bonded (weakly bonded) to the OPP surface (butene-containing polypropylene resin surface) of the inner layer material to produce a lid material.
And this lid | cover material was punched out in the shape with a diameter 76mm tab, and the lid | cover was produced.

(Comparative example)
As an inner layer base material, a 12 μm PET film in which an acrylic release agent is applied in a large number of dots (about 1 mm in diameter) with a gravure printing machine in advance, and 10 parts by weight of LX500 manufactured by Dainippon Ink & Chemicals, Inc. as a main ingredient. As a two-part curable adhesive, this adhesive was diluted with ethyl acetate, and dried on the opposite side of the PET film on the opposite side of the release coat to a weight of 3.5 g / Coating and drying were performed by a gravure method so as to be mm ² .
A 30 μm unstretched polypropylene film CF3301 manufactured by Toray Film Processing Co., Ltd. was bonded as a heat-adhesive resin with a 60 ° C. heat roll, and cured at 40 ° C. for 3 days.
The inner layer material was preliminarily punched with a diameter of 2 mm.
Further, a 25 μm PET film was used as the outer layer base material, and was bonded to the inner layer material using a urethane adhesive to produce a lid material.
And this lid | cover material was punched out in the shape with a diameter 76mm tab, and the lid | cover was produced.

The container uses a polypropylene container (opening diameter: 70 mm) having a flange in the opening, and each lid produced above uses a 1 mm wide ring-shaped hot plate. For Reference Example 1 , 200 ° C. × 100 kg / cup × 1 second. For Example 2, 210 ° C. × 100 kg / cup × 1 second, for Examples 3, 4 and Comparative Example, 220 ° C. × 100 kg / cup × 1 second. Sealing was performed.

When the outer layer material and the inner layer material which are the tab portions of the lids of these Examples and Comparative Examples were picked and peeled, a test was conducted to check whether only the outer layer material was peeled off from the container, and the following three stages were evaluated. Moreover, the strength at the time of peeling the outer layer material from the container was measured as an opening strength (peeling in a 45 ° elevation direction when viewed from the direction of the tab portion, strain rate 200 mm / min).
In addition, the peel strength between the outer layer material and the inner layer material is subjected to a T-type peel test (strain rate: 100 mm / min) using a sample (length 200 mm × 15 mm width) separately prepared from the lids of Examples and Comparative Examples. It was measured by.

The results are shown in Table 1.
Opening evaluation A in the table indicates that only the inner layer in the ring seal remains in the container, and the outer layer and the inner layer outside the ring seal have been peeled off from the container. B shows that a part of the inner layer in the ring seal has been opened. Indicates that it was torn and peeled off together with the outer layer, and C indicates that it could not be opened by hand.

  As can be seen from the table, the openability of the lids of Examples 2 to 4 is particularly good, whereas the openability of the lid of the comparative example is insufficient.

Partial expanded sectional view of the cover material of the first embodiment Partial enlarged sectional view of the cover material of the second embodiment Partial partial cross-sectional view of the package Partial enlarged sectional view showing the opening start state of the package Partial enlarged sectional view showing a state in which the lid material is ring sealed to the container

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Packing body 10 Embodiment 1 Cover material 11 of 1st embodiment Inner layer 11a Base material layer 11b Seal layer 12 Outer layer 12a Base material layer 12b Polyethylene resin layer 20 Cover material 21 of 2nd embodiment Inner layer 21a Base material layer 21b Seal layer 21c Butene-containing polypropylene resin layer 22 Outer layer 22a Base material layer 22b Polyethylene resin layer 30 Lid 31 Inner layer 31a Through hole 32 Outer layer 33 Tab 34 Ring seal part 40 Container 41 Bottom surface 42 Peripheral surface 43 Flange 50 Deodorizer 60 Heat Board

Claims (4)

A packaging body comprising a resin container having a flange at an opening, a storage object stored in the resin container, and a lid formed from a lid material formed by laminating an inner layer and an outer layer,
The lid member has a polyethylene-based resin layer at the boundary between the outer layer and the inner layer, and the inner layer has at least a base material layer made of a stretched polypropylene film and a seal layer made of a heat-adhesive resin. The layer constitutes an outer surface heat seal surface, and the polyethylene-based resin layer and the inner layer of the outer layer are formed so as to be capable of interfacial peeling,
Only the ring seal portion of the inner layer of the lid formed by ring sealing at a temperature of 210 ° C. to 240 ° C. by applying a seal layer of the inner layer of the lid formed of the lid material to the upper surface of the flange of the resin container Is a fragile package.   The package according to claim 1, wherein one or a plurality of through holes penetrating in the thickness direction are provided in the inner layer of the lid member.   The package according to claim 1 or 2, wherein an interfacial peel strength between the polyethylene-based resin layer and the inner layer of the outer layer of the lid member is 0.02 N / 15 mm to 0.5 N / 15 mm.   The package according to any one of claims 1 to 3, wherein the inner layer of the lid member has a butene-containing polypropylene resin layer at a boundary with the polyethylene resin layer of the outer layer.

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