JP7153428B2 - Lid material and package - Google Patents

Description

More specifically, the present invention relates to a lid material, and more particularly, it releases fragrance, deodorizes, deodorizes, etc. by exchanging gas between a storage space and an external space, such as aromatic agents, deodorants, and moisture absorbents. The present invention relates to a lid material used for a container for storing an article having a predetermined function such as moisture absorption.
The present invention also relates to a packaging body in which an article such as a fragrance is packaged with the lid member and the container.

For example, when packaging a liquid fragrance, it is required that the fragrance be sealed when it is not in use. It is required that gas exchange takes place between them so that the volatilized aromatic components are released to the outside space.
As a lid material used in combination with a flanged plastic molded container for packaging such a liquid aromatic, the one described in Patent Document 1 is known.
This cover material is composed of a composite film composed of a substrate film, a barrier layer, a buffer layer, an adhesive layer and a sealant layer, which are sequentially laminated from the outside. The adhesive layer is an extruded layer of polyethylene resin. A sealant layer consists of a polyethylene resin film. When the fragrance is used, the cover material is separated from the buffer layer and the adhesive layer, and gas is exchanged between the storage space inside the container and the external space via the adhesive layer and sealant layer remaining on the container side. is performed, and the aromatic components are released into the external space.

Japanese Patent No. 5257425

In the case of the invention of Patent Document 1, attention is paid to the fact that the content resistance of the lid material is enhanced by providing a buffer layer made of a predetermined film between the barrier layer and the sealant layer of the lid material. No consideration has been given to the point of controlling the aroma release to be carried out stably for a certain period of time when the fragrance contained therein is used.

The present invention has been devised in view of the above problems. An object of the present invention is to provide a lid material that

This invention consists of the following aspects in order to achieve said objective.

1) A lid material used for a container that houses an article that performs a predetermined function by gas exchange between a storage space and an external space,
An outer layer portion having gas barrier properties and an inner layer portion detachably laminated inside the outer layer portion and having gas permeability,
The inner layer portion has a sealant layer that is heat-sealed to the opening edge of the container, and an adhesive layer that is disposed outside the sealant layer and adheres the sealant layer to the outer layer portion,
A lid material, wherein the inner layer portion has an average density of 0.91 to 0.93 g/cm ³ .

2) The lid material according to 1) above, wherein the sealant layer is made of a polyolefin resin film, and the adhesive layer is made of an extruded layer of polyolefin resin.

3) The lid material according to 1) or 2) above, wherein the outer layer portion has a substrate layer, a barrier layer and a buffer layer which are sequentially laminated from the outside.

4) The lid material according to 3) above, wherein the buffer layer is made of a polyamide resin film, and the corona-treated layer is formed only on the barrier layer-side surface of both surfaces of the polyamide resin film.

5) The lid material according to any one of 1) to 4) above, wherein the peel strength between the outer layer portion and the inner layer portion is 0.4 to 1.5 N/15 mm.

6) A container containing an article that performs a predetermined function by gas exchange between the containing space and the external space, and a lid material heat-sealed to the opening edge of the container so as to cover the opening of the container. A packaging body comprising
A package, wherein the cover member is made of any one of the above 1) to 5).

7) The package of 6) above, wherein the article is a fragrance, deodorant or moisture absorbent.

The lid material of 1) above is heat-sealed to the opening edge of the container so as to cover the opening of the container containing the article that performs a predetermined function by gas exchange between the containing space and the external space. and thereby constitute a package in which the article is hermetically packaged. When using the article, the outer layer of the lid member is peeled off, and gas is exchanged between the storage space inside the container and the outer space via the inner layer remaining on the container side, whereby the container The articles housed in the box perform a predetermined function.
According to the lid material of 1) above, the inner layer portion has a sealant layer and an adhesive layer, and has an average density of 0.91 to 0.93 g/cm ³ . To stably maintain the speed of gas exchange between the storage space and the external space through the container for a certain period of time, and to stably perform the functions of the articles housed in the container for a certain period of time. can be done.

According to the lid material of 2) above, since the sealant layer is made of a polyolefin resin film and the adhesive layer is made of an extruded layer of polyolefin resin, it is easy to process, has versatility, and is low in cost. suppressed.

According to the lid material of 3) above, when the article is in an unused sealed package state, high gas barrier properties can be obtained by the barrier layer of the outer layer portion. Deterioration of the barrier layer and occurrence of delamination are effectively suppressed by the buffer layer in the portion.

According to the lid material of 4) above, the buffer layer of the outer layer portion is made of a polyamide resin film in which only the surface on the barrier layer side is subjected to corona treatment, so that the pinhole resistance of the inner layer portion is improved. When the outer layer portion of the lid member is peeled off from the inner layer portion, the outer layer portion is less likely to be torn, and the peelability is improved.

According to the lid material of 5) above, since the peel strength between the outer layer portion and the inner layer portion is 0.4 to 1.5 N/15 mm, there is no risk that the outer layer portion will be inadvertently peeled off when the lid is unopened, resulting in excellent sealing. In addition, the outer layer can be easily peeled off when the package is opened.

According to the package of 6) above, when the outer layer of the lid member is peeled off and the article is used, the storage space and the outer space are separated through the inner layer portion of the lid member having the characteristic configuration as described above. The rate of gas exchange between the two is maintained stably for a certain period of time, and the functions of the articles housed in the container are stably performed for a certain period of time.

According to the package described in 7) above, the fragrance, deodorant, or moisture absorbent can be packaged so that their functions of releasing fragrance, deodorizing, or absorbing moisture can be stably performed for a certain period of time.

1 is a vertical cross-sectional view showing an overall outline of a package according to an embodiment of this invention; FIG. It is a partial enlarged vertical cross-sectional view of the package. It is a partially enlarged vertical cross-sectional view showing the state after opening the package.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG.

FIG. 1 shows an overall outline of a package according to the invention.
The illustrated package (1) consists of a container (2) containing an article (C) and a lid heat-sealed to the opening edge (2a) of the container (2) so as to cover the opening of the container (2). It is provided with material (3).

The article (C) accommodated in the container (2) as the content performs a predetermined function through gas exchange between the accommodation space and the external space. Fragrances, deodorants, and moisture absorbers are included.

The container (2) is made of a cup-shaped resin molding, and has a horizontal flange (2a) at the upper opening edge. However, the shape of the container is not limited to that shown in the drawings, and can be changed as appropriate.
A single-layer sheet or a composite sheet of two or more layers is used as the molding material for the container (2). The container (2) shown in FIGS. 2 and 3 is made of a composite sheet with a two-layer structure, and the outer layer (21) is made of a heat-resistant material such as a polyvinyl chloride resin (PVC) film, The inner layer (22) is made of a heat-sealable material such as a polyethylene resin (PE) film. A barrier layer made of metal foil such as aluminum foil may be interposed between the outer layer (21) and the inner layer (22) to improve the barrier properties of the container (2). be able to.

The lid (3) includes an outer layer (3a) having gas barrier properties, and an inner layer (3b) that is peelably laminated on the inner side of the outer layer (3a) and has gas permeability.
Although not shown, the lid (3) is integrally provided with a tab protruding radially outward from a portion of its peripheral edge.

The outer layer (3a) of the lid (3) has a substrate layer (31), a barrier layer (32) and a buffer layer (33) which are sequentially laminated from the outside (upper side in FIGS. 2 and 3). .
The base layer (31) constitutes the outer surface of the lid (3), and is made of, for example, a polyethylene terephthalate resin (PET) film, a polybutylene terephthalate resin (PBT) film, a polyethylene naphthalate resin (PEN) film, or the like. of polyester resin film. The thickness of the base layer (31) is about 10-50 μm.
The barrier layer (32) is for imparting barrier properties to the lid material (3) in an unopened state in which the article (C), which is the content, is not used. ) foil metal foil. The barrier layer (32) has a thickness of about 5 to 50 μm.
For example, when the article (C), which is the content, is an aromatic agent or the like, the barrier layer (32) may deteriorate due to volatilized aromatic components or the like, or the barrier layer (32) and the adhesive layer ( 34) to prevent delamination from occurring. The buffer layer (33) is preferably made of a polyamide resin film. The polyamide resin film that constitutes the buffer layer (33) preferably has a corona-treated layer (not shown) formed only on the surface on the barrier layer (32) side of the two surfaces, thereby forming the inner layer (33). The pinhole resistance of 3b) is improved, and when the outer layer (3a) of the lid member (3) is peeled and opened, the outer layer (3a) is less likely to tear, improving peelability. The thickness of the buffer layer (33) is about 10-40 μm.

The inner layer (3b) of the lid (3) consists of a sealant layer (35) heat-sealed to the flange (2a) of the container (2) and the outside of the sealant layer (35) (upper side in FIGS. 2 and 3). and an adhesive layer (34) disposed on the outer layer (3a) to adhere the sealant layer (35) to the buffer layer (33) of the outer layer (3a).
The sealant layer (35) is made of a polyolefin resin film such as a polyethylene resin (PE) film or an ethylene-vinyl acetate copolymer (EVA) film. The adhesive layer (34) is an extruded layer of polyolefin resin such as polyethylene resin (PE), ethylene-vinyl acetate copolymer resin (EVA).
The average density of the inner layer (3b) including the adhesive layer (34) and sealant layer (35) is 0.91 to 0.93 g/cm ³ . Here, the "average density" of the inner layer (3b) is calculated from the density of each layer (35) and (34) measured by the D method (density gradient tube method) specified in JIS K7112 (1999). Say. Specifically, it is as follows.
^DOG = (D ^AD ×t ^AD +D ^SL ×t ^SL )/(t ^AD +t ^SL )
D ^OG : Average density of inner layer (out gassing)
D ^AD : Density of adhesive layer
t ^AD : Thickness of adhesive layer
D ^SL : Density of sealant layer
t ^SL : Thickness of sealant layer The melting point of the polyolefin resin forming the adhesive layer (34) is 5 to 25°C higher than the melting point of the polyolefin resin forming the sealant layer (35). preferable. Here, the "melting point" is measured according to the method for measuring the melting temperature of plastics specified in JIS K7121 (2012). When the lid material (3) is heat-sealed to the flange (2a) of the container (2), the sealant layer (35) is first adhered because the melting point difference is 5°C or more. ) is not displaced, and since the melting point difference is within 25° C., the buffer layer (33) is not melted and peeled off from a place other than the intended location.
The thickness of the sealant layer (35) is preferably about 30-80 μm, and the thickness of the adhesive layer (34) is preferably about 20 μm or less. Furthermore, it is preferable that the total thickness of the inner layer portion (3b) including the sealant layer (35) and the adhesive layer (34) is 35 μm to 80 μm. The speed of gas exchange can be controlled by the thickness of the inner layer (3b), and by setting the thickness within the above range, for example, when the article (C) is an aromatic, an appropriate scent is released during use. In addition, it is possible to use up the aromatic agent as the content within a period in which it does not degrade.

The method of heat-sealing the lid member (3) to the flange (2a) of the container (2) is not particularly limited, but a knurled seal is preferably used to obtain high sealing strength.

For example, by pulling up the lid member (3) by holding the knob, the gap between the outer layer (3a) and the inner layer (3b), that is, between the buffer layer (33) and the adhesive layer (34) is removed. Interfacial peeling occurs between them. As a result, the outer layer (3a) is separated from the container (2), leaving only the inner layer (3b) on the side of the container (2). Gas exchange takes place with the external space, and the article (C), such as a fragrance, which is the content, performs a function such as releasing fragrance.
The peel strength between the outer layer (3a) and the inner layer (3b) is preferably 0.4-1.5 N/15 mm, more preferably 0.6-1.3 N/15 mm. If the peel strength is less than 0.4 N/15 mm, the outer layer (3a) may be unintentionally peeled off when unopened. becomes difficult to peel off. Here, the "peel strength" refers to the value measured under the condition that 15 mm wide samples adhered in a T-shape are peeled at 100 mm/min.

Next, specific examples of the invention will be described, but the invention is not limited to these examples.

<Production of lid material>
A polyethylene terephthalate resin (PET) film (= base layer) with a thickness of 12 μm is placed on one side of an aluminum foil (= barrier layer) with a thickness of 9 μm made of A1N30H-O specified in JIS H4160 (2006). Dry lamination was performed using a two-liquid curing type polyester urethane resin adhesive.
Next, on the other surface of the aluminum foil, a polyamide resin film (=buffer layer) having a thickness of 15 μm having only one surface subjected to corona treatment was applied so that the corona-treated layer faced the aluminum foil. Dry lamination was performed using a two-liquid curing type polyester urethane resin adhesive.
A polyethylene resin (PE) film (=sealant layer) having a thickness of 50 μm was laminated by extrusion lamination using polyethylene resin (PE) on the polyamide resin film side surface of the laminate (=outer layer portion) thus obtained. . The thickness of the polyethylene resin extruded layer (=adhesive layer) was 15 μm. Here, for the polyethylene resin film and the polyethylene resin extruded layer, those having the density and melt flow rate (MFR) shown in Table 1 below are used, and the laminated portion (= inner layer portion) of the polyethylene resin film and the polyethylene resin extruded layer ) was made to have an average density as shown in Table 1.

The five types of laminates obtained as described above were cut into substantially circular shapes with a diameter of 45 mm to prepare lid members of Examples 1 to 3 and Comparative Examples 1 and 2.

<Production of package>
Next, prepare a plurality of cup-shaped containers (flange outer diameter 40 mm, inner diameter 35 mm) as shown in FIG. , each container was filled with 3 cc of liquid fragrance. Three types of A, B, and C were used for the fragrance.
Then, the lid materials of Examples 1 to 3 and Comparative Examples 1 and 2 were placed on the upper surface of the flange of each container containing the aromatics A, B, and C so that the sealant layer faced the flange, and both were heated. fused. Thermal fusion bonding was performed using a knurl sealer under the conditions of a heating temperature of 160° C., a pressure of 0.2 MPa, and a heating and pressing time of 1 second.
Packages of Examples 1 to 3 and Comparative Examples 1 and 2 were produced through the above steps.

<Verification of change in air freshener transmittance>
The lid materials of the packages of Examples 1 to 3 and Comparative Examples 1 and 2 were separated between the polyamide resin film and the polyethylene resin extruded layer, leaving only the polyethylene resin extruded layer and the polyethylene resin film on the container side. and stored in this state at room temperature for one month.
During storage, the weight of each package was measured every other week, and the change in the transmittance of the fragrance was confirmed by calculating the difference from the weight before storage. Then, "○" indicates that the change in transmittance was stable for one month, and "x" indicates that it was unstable. The results are shown in Table 2 below.

As shown in Table 2, in the packages of Examples 1 and 2, the change in transmittance was stable for one month regardless of the type of fragrance, indicating that the fragrance was stably released. In addition, in the case of the package of Example 3, changes in the transmittance of some of the fragrances were almost stable for one month. On the other hand, in the packages of Comparative Examples 1 and 2, changes in transmittance were unstable.

INDUSTRIAL APPLICABILITY The present invention can be suitably used, for example, as packaging materials for fragrances, deodorants, moisture absorbents, and the like.

(1): package
(2): container
(2a): Flange (opening edge)
(3): Lid material
(3a): outer layer
(3b): inner layer
(31): base layer
(32): Barrier layer
(33): buffer layer
(34): Adhesion layer
(35): Sealant layer
(C): Goods

Claims (3)

A lid material used for a container that stores an article that performs a predetermined function by gas exchange between a storage space and an external space,
An outer layer portion having gas barrier properties and an inner layer portion detachably laminated inside the outer layer portion and having gas permeability,
The outer layer part has a base material layer, a barrier layer and a buffer layer made of a polyamide resin film, which are sequentially laminated from the outside,
The inner layer portion has a sealant layer that is heat-sealed to the opening edge of the container, and an adhesive layer that is disposed outside the sealant layer and adheres the sealant layer to the outer layer portion,
The adhesive layer is made of an extruded layer of polyethylene resin, the sealant layer is made of a polyethylene resin film, and the melting point of the polyethylene resin forming the adhesive layer is 5 to 25°C higher than the melting point of the polyethylene resin forming the sealant layer. Moreover, the difference between the melting point of the polyethylene resin forming the adhesive layer and the melting point of the polyethylene resin forming the sealant layer is within 25°C. cage,
Of the two surfaces of the polyamide resin film forming the buffer layer, a corona-treated layer is formed on the barrier layer-side surface, but no corona-treated layer is formed on the adhesive layer-side surface.
The average density of the inner layer is 0.91 to 0.93 g/cm ³ and the density of the sealant layer is higher than the density of the adhesive layer,
The sealant layer has a thickness of 30 to 80 μm, the adhesive layer has a thickness of 20 μm or less, and the total thickness of the sealant layer and the adhesive layer is 35 to 80 μm,
The peel strength between the outer layer and the inner layer is 0.4 to 1.5 N/15 mm,
Lid material. A container containing an article that performs a predetermined function by gas exchange between a storage space and an external space, and a lid material heat-sealed to the opening edge of the container so as to cover the opening of the container. A package comprising
A package, wherein the lid material is the lid material according to claim 1 . 3. The package of claim 2 , wherein the article is a fragrance, deodorant or moisture absorbent.

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