CN108974635B

CN108974635B - Lid material and package

Info

Publication number: CN108974635B
Application number: CN201810521799.7A
Authority: CN
Inventors: 古谷笃
Original assignee: Showa Denko Packaging Co Ltd
Current assignee: Lishennoco Packaging Co ltd
Priority date: 2017-05-30
Filing date: 2018-05-28
Publication date: 2021-02-19
Anticipated expiration: 2038-05-28
Also published as: JP2018203265A; TW201900422A; TWI723265B; JP7153428B2; CN108974635A

Abstract

The present invention relates to a lid material and a package. The present invention addresses the problem of providing a lid material that, when an article such as an aromatic agent contained in a container is used, can stably exert the function of the article such as fragrance emission for a certain period of time. The cover material (3) is used in a container (2) for storing an article (C) which performs a predetermined function by exchanging gas between a storage space and an external space, and comprises an outer layer part (3a) having gas barrier properties and an inner layer part (3b) laminated in a peelable manner on the inner side of the outer layer part and having gas permeability. The inner layer part has a sealing layer (35) thermally welded to an opening edge part (2a) of the container and an adhesive layer (34) arranged outside the sealing layer and adhering the sealing layer to the outer layer part. The inner layer has an average density of 0.91 to 0.93g/cm³。

Description

Lid material and package

Technical Field

The present invention relates to a lid material, and more particularly, to a lid material used in a container for storing an article that exhibits a predetermined function such as fragrance release, deodorization, and moisture absorption by exchanging gas between a storage space and an external space, such as a fragrance, a deodorant, and a moisture absorbent.

The present invention also relates to a package in which an article such as an aromatic agent is packaged by the lid member and the container.

Background

For example, in the case of packaging a liquid aromatic agent, it is required to seal the aromatic agent when the aromatic agent is not used, and to release the volatilized aromatic component into the external space by exchanging gas between the storage space and the external space without spilling the aromatic agent when the aromatic agent is used.

As a lid material used in combination with a plastic molded container with a flange for packaging such a liquid aromatic agent, a lid material described in patent document 1 is known.

Such a lid material is composed of a composite film including a base film, a barrier layer, a cushion layer, an adhesive layer, and a sealing layer laminated in this order from the outside. The adhesive layer is formed of an extruded layer of polyethylene resin. The sealing layer is formed of a polyethylene resin film. When the aromatic agent is used, the lid material is peeled off at the interface between the cushion layer and the adhesive layer, and the gas is exchanged between the storage space in the container and the external space through the adhesive layer and the sealing layer which are retained on the container side, whereby the aromatic component is released to the external space.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 5257425

Disclosure of Invention

Problems to be solved by the invention

In the case of the invention of patent document 1, the content resistance of the lid is improved by providing a buffer layer formed of a predetermined film between the barrier layer and the seal layer of the lid, and although patent document 1 focuses on the above, it does not consider the following: when the aromatic agent is used as the content, the aromatic agent is controlled so that the aromatic release is stably performed for a certain period of time.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a lid material that can stably exhibit a function such as fragrance emission for a certain period of time when an article such as a fragrance contained in a container is used.

Means for solving the problems

In order to achieve the above object, the present invention includes the following aspects.

1) A lid member used in a container for storing an article which performs a predetermined function by exchanging gas between a storage space and an external space,

the lid material comprises an outer layer section having gas barrier properties and an inner layer section having gas permeability and laminated so as to be separable on the inside of the outer layer section,

the inner layer part has a sealing layer and an adhesive layer arranged outside the sealing layer and adhering the sealing layer to the outer layer part, the sealing layer is thermally welded to the opening edge part of the container,

the inner layer has an average density of 0.91 to 0.93g/cm³。

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

3) The lid material according to 1) or 2) above, wherein the outer layer portion has a base material layer, a barrier layer, and a cushion layer laminated in this order from the outside.

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

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

6) A package body having a container that contains an article that performs a predetermined function by exchanging gas between a storage space and an external space, and a lid member thermally welded to an opening edge portion of the container so as to cover an opening of the container,

the lid is formed from the lid of any one of 1) to 5) above.

7) The package according to the above 6), wherein the article is an aromatic agent, a deodorant agent or a moisture absorbent.

Effects of the invention

The lid member of the above 1) is heat-welded to an opening edge portion of a container (which houses an article that performs a predetermined function by exchanging gas between the housing space and an external space) so as to cover the opening of the container, thereby constituting a package in which the article is hermetically packaged. When the article is used, the outer layer portion of the lid member is peeled off and removed, and gas is exchanged between the storage space in the container and the external space via the inner layer portion remaining on the container side, whereby the article stored in the container can exhibit a predetermined function.

Further, according to the lid material of the above 1), the inner layer portion has the sealing layer and the adhesive layer, and the average density of the inner layer portion is set to 0.91 to 0.93g/cm³Accordingly, the speed of gas exchange between the storage space and the external space through the inner layer portion is stably maintained for a certain period of time, and the function of the article stored in the container is stably exerted for a certain period of time.

According to the lid material of the above 2), since the sealing layer is formed of the polyolefin resin film and the adhesive layer is formed of the extruded layer of the polyolefin resin, the processing is easy and the versatility is provided, and the cost can be reduced.

According to the lid material of the above 3), high gas barrier property is obtained by the barrier layer of the outer layer portion in a hermetically sealed and packaged state in which the article is not used, and even in the case where the article as a content is an aromatic agent or the like, the occurrence of deterioration or delamination (delamination) of the barrier layer can be effectively suppressed by the buffer layer of the outer layer portion.

According to the lid material of the above 4), since the cushion layer of the outer layer portion is formed of the polyamide resin film which is corona-treated only on the surface on the barrier layer side, the pinhole resistance of the inner layer portion is improved, and when the outer layer portion and the inner layer portion of the lid material are peeled, the outer layer portion becomes less likely to be broken, and the peelability is improved.

According to the lid material of the above 5), since the peel strength between the outer layer portion and the inner layer portion is 0.4 to 1.5N/15mm, the outer layer portion is not inadvertently peeled off when not opened, excellent sealability is obtained, and the outer layer portion can be easily peeled off when opened.

According to the package of the above 6), when the outer layer portion of the lid member is peeled off and removed and the article is used, the speed of gas exchange between the housing space and the external space is stably maintained for a certain period of time via the inner layer portion of the lid member having the above-described characteristic configuration, and the function of the article housed in the container is stably exhibited for a certain period of time.

The package according to the above 7) can package the aromatic agent, the deodorant, or the moisture absorbent so that the function of the aromatic agent, the deodorant, or the moisture absorbent, that is, the release of fragrance, the deodorization, or the moisture absorption, can be stably exhibited for a certain period of time.

Drawings

Fig. 1 is a vertical cross-sectional view showing an overall outline of a package according to an embodiment of the present invention.

Fig. 2 is a partially enlarged vertical sectional view of the package.

Fig. 3 is a partially enlarged vertical sectional view showing a state after the package is opened.

Description of the reference numerals

1: packaging body

2: container with a lid

2 a: flange (opening edge)

3: cover material

3 a: outer layer part

3 b: inner layer part

31: substrate layer

32: barrier layer

33: buffer layer

34: adhesive layer

35: sealing layer

C: article with a cover

Detailed Description

Embodiments of the present invention will be described below with reference to fig. 1 to 3.

Fig. 1 shows an overall overview of the package of the present invention.

The illustrated package 1 includes: a container 2 in which the articles C are stored, and a lid member 3 thermally welded to an opening edge portion 2a of the container 2 so as to cover the opening of the container 2.

The article C contained in the container 2 as a content is an article that performs a predetermined function by exchanging gas between the containing space and the external space, and specifically, the article C is, for example, an aromatic agent, a deodorant agent, or a moisture absorbent.

The container 2 is formed of a cup-shaped resin molded body, and has a horizontal flange 2a at an upper opening edge portion thereof. However, the shape of the container is not limited to the illustrated one, and may be changed as appropriate.

As the molding material of the container 2, a single-layer sheet or a composite sheet having two or more layers can be used. The container 2 shown in fig. 2 and 3 is formed of a composite sheet having a two-layer structure, the outer layer 21 is formed of a heat-resistant material such as a polyvinyl chloride (PVC) film, and the inner layer 22 is formed of a heat-fusible material such as a Polyethylene (PE) film. Further, a barrier layer formed of a metal foil such as an aluminum foil may be interposed between the outer layer 21 and the inner layer 22, thereby improving the barrier property of the container 2.

The lid member 3 includes an outer layer portion 3a having gas barrier properties, and an inner layer portion 3b laminated in a detachable manner on the inner side of the outer layer portion 3a and having gas permeability.

Although not shown in the drawings, a tab (japanese: タブ) protruding outward in the radial direction from a part of the peripheral edge portion of the lid material may be integrally provided on the lid material 3.

The outer layer portion 3a of the lid member 3 includes a base material layer 31, a barrier layer 32, and a cushion layer 33 laminated in this order from the outside (the upper side in fig. 2 and 3).

The base material layer 31 constitutes the outer surface of the cover member 3, and is formed of a polyester resin film such as a polyethylene terephthalate resin (PET) film, a polybutylene terephthalate resin (PBT) film, or a polyethylene naphthalate resin (PEN) film. The thickness of the base material layer 31 is about 10 to 50 μm.

The barrier layer 32 is a layer for providing barrier properties to the lid 3 in an unopened state in which the article C as a content is not used, and the barrier layer 32 is made of a metal foil such as an aluminum foil or a stainless (SUS) foil. The thickness of the barrier layer 32 is about 5 to 50 μm.

For example, when the article C as the content is an aromatic agent or the like, the cushion layer 33 serves to prevent the barrier layer 32 from deteriorating due to a volatilized aromatic component or the like and to prevent delamination from occurring between the barrier layer 32 and the adhesive layer 34. The buffer layer 33 is preferably made of a polyamide resin film. Preferably, in the polyamide resin film constituting the cushion layer 33, the inner layer portion 3b is improved in pinhole resistance by forming a corona treatment layer (not shown) only on the barrier layer 32 side of both surfaces thereof, and the outer layer portion 3a is not easily broken when peeling and unsealing the outer layer portion 3a of the lid member 3, thereby improving peelability. The thickness of the buffer layer 33 is about 10 to 40 μm.

The inner layer 3b of the lid member 3 includes a sealant layer 35 thermally welded to the flange 2a of the container 2, and an adhesive layer 34 arranged on the outer side (upper side in fig. 2 and 3) of the sealant layer 35 to adhere the sealant layer 35 to the cushion layer 33 of the outer layer 3 a.

The sealing layer 35 is formed of a polyolefin resin film such as a polyethylene resin (PE) film or an ethylene-vinyl acetate copolymer resin (EVA) film. The adhesive layer 34 is formed of an extruded layer of polyolefin resin such as polyethylene resin (PE) and ethylene-vinyl acetate copolymer resin (EVA).

The average density of the inner layer part 3b formed by combining the bonding layer 34 and the sealing layer 35 is 0.91-0.93 g/cm³. Here, the "average density" of the inner layer portion 3b means an average density calculated from the densities of the

respective layers

35 and 34 measured by the D method (density gradient tube method) defined in JIS K7112 (1999). The details are as follows.

D^OG＝(D^AD×t^AD+D^SL×t^SL)/(t^AD+t^SL)

D^OG: average density of inner layer (Out scattering)

D^AD: density of adhesion layer (Adhesive)

t^AD: thickness of the adhesive layer

D^SL: density of sealing layer (Sealant)

t^SL: thickness of the sealing layer

Preferably, the melting point of the polyolefin resin constituting the adhesive layer 34 is 5 to 25 ℃ higher than the melting point of the polyolefin resin constituting the sealing layer 35. Here, the "melting point" refers to a melting point measured by a method for measuring a melting temperature of a plastic specified in JIS K7121 (2012). When the melting point difference is 5 ℃ or more, the lid 3 starts to adhere to the flange 2a of the container 2 from the sealing layer 35 and the lid 3 does not deviate during adhesion, and when the melting point difference is within 25 ℃, the buffer layer 33 does not melt and is not peeled from the target position.

The thickness of the sealing layer 35 is preferably about 30 to 80 μm, and the thickness of the adhesive layer 34 is preferably about 20 μm or less. The total thickness of the inner layer portion 3b formed by combining the seal layer 35 and the adhesive layer 34 is preferably 35 μm to 80 μm. The rate of gas exchange can be controlled by the thickness of the inner layer 3b, and by adopting the above thickness range, for example, when the article C is a fragrance, a moderate fragrance can be emitted during use, and the fragrance as the content can be used up without deterioration.

The method of heat-welding the lid member 3 to the flange 2a of the container 2 is not particularly limited, and a knurled seal (roulette seal) is preferably used, whereby high seal strength can be obtained.

The lid member 3 can be peeled off at the interface between the outer layer portion 3a and the inner layer portion 3b (i.e., between the cushion layer 33 and the adhesive layer 34) by pulling up the lid member by, for example, gripping a handle thereof. As a result, the outer layer portion 3a is separated from the container 2, only the inner layer portion 3b remains on the container 2 side, and the storage space in the container 2 and the external space exchange gas via the inner layer portion 3b, thereby functioning as an article C such as an aromatic agent as a content to emit fragrance.

The peel strength between the outer layer portion 3a and the inner layer portion 3b is preferably 0.4 to 1.5N/15mm, and more preferably 0.6 to 1.3N/15 mm. When the peel strength is less than 0.4N/15mm, the outer layer portion 3a may be unintentionally peeled off when the outer layer portion is not opened; on the other hand, if the peel strength exceeds 1.5N/15mm, it becomes difficult to peel the outer layer portion 3a at the time of opening the package. Here, the "peel strength" refers to the peel strength measured under the condition that samples having a width of 15mm bonded in a T shape are peeled from each other at 100 mm/min.

Examples

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

Production of cover material

A polyethylene terephthalate resin (PET) film (i.e., a base layer) having a thickness of 12 μm was dry-laminated on one surface of an aluminum foil (i.e., a barrier layer) having a thickness of 9 μm formed from A1N 30H-O specified in JIS H4160(2006) using a two-pack curable polyester urethane resin adhesive.

Next, a polyamide resin film (i.e., a buffer layer) having a thickness of 15 μm, which had been subjected to corona treatment only on one surface thereof, was dry-laminated on the other surface of the aluminum foil using a two-pack curable polyester urethane resin adhesive so that the corona-treated layer thereof was opposed to the aluminum foil.

A polyethylene resin (PE) film (i.e., a sealant layer) having a thickness of 50 μm was laminated on the surface of the laminate (i.e., the outer layer portion) on the polyamide resin film side by extrusion lamination using a polyethylene resin (PE). The thickness of the extruded layer of polyethylene resin (i.e., adhesive layer) was made 15 μm. Here, as the polyethylene resin film and the polyethylene resin extruded layer, those having the densities and Melt Flow Rates (MFRs) shown in table 1 below were used, and the average densities of the laminated portions (i.e., inner layer portions) of the polyethylene resin film and the polyethylene resin extruded layer were as shown in table 1.

[ Table 1]

The 5 laminated bodies obtained in the above-described manner were cut into a substantially circular shape having a diameter of 45mm, and the lid materials of examples 1 to 3 and comparative examples 1 and 2 were produced.

Production of package

Next, a plurality of cups (flange having an outer diameter of 40mm and an inner diameter of 35mm) formed of polyethylene resin (PE) on the inner layer side and polyvinyl chloride resin (PVC) on the outer layer side as shown in fig. 1 were prepared, and 3cc of liquid fragrance was filled into each of the cups. A, B, C three fragrances were used.

Next, 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 to which the aromatic agent A, B, C was added so that the sealing layer faced the flange, and the two were heat-welded. The heat-sealing was carried out by a knurling sealing device under the conditions of a heating temperature of 160 ℃, a pressing pressure of 0.2MPa and a heating and pressing time of 1 second.

Through the above steps, the packages of examples 1 to 3 and comparative examples 1 and 2 were obtained.

Verification of aromatic permeability variation

The lid materials of the packages of examples 1 to 3 and comparative examples 1 and 2 were peeled off between the polyamide resin film and the polyethylene resin extruded layer to leave only the polyethylene resin extruded layer and the polyethylene resin film on the container side, and the packages were stored for 1 month in a room temperature environment in this state.

During storage, the weight of each package was measured every other week, and the difference from the weight before storage was calculated, thereby confirming the change in the transmittance of the aromatic agent. Next, a case where the change in transmittance was stable for one month was determined as "o", and a case where the change was unstable was determined as "x". The results are shown in table 2 below.

[ Table 2]

As shown in table 2, in the packages of examples 1 and 2, the change in transmittance was stable for each fragrance for one month, and the fragrance was stably emitted. In the case of the package of example 3, the change in transmittance for a portion of the fragrance was substantially stable over a month. On the other hand, the change in transmittance was unstable in the packages of comparative examples 1 and 2.

Industrial applicability

The present invention can be suitably used as a packaging material for, for example, a fragrance, a deodorant, a moisture absorbent, and the like.

Claims

1. A lid member used in a container for storing an article which performs a predetermined function by exchanging gas between a storage space and an external space,

the cover material is characterized in that the cover material,

the inner layer has an average density of 0.91 to 0.93g/cm³。

2. The lid material according to claim 1, wherein the sealing layer is formed of a polyolefin-based resin film, and the adhesive layer is formed of an extruded layer of a polyolefin-based resin.

3. The lid material according to claim 1, wherein the outer layer portion has a base material layer, a barrier layer, and a cushion layer laminated in this order from the outside.

4. The lid material according to claim 3, wherein the buffer layer is formed of a polyamide resin film, and a corona treatment layer is formed on the polyamide resin film only on the barrier layer side of both surfaces of the polyamide resin film.

5. The lid material according to claim 1, wherein the peel strength between the outer layer portion and the inner layer portion is 0.4 to 1.5N/15 mm.

6. A package body having a container that contains an article that performs a predetermined function by exchanging gas between a storage space and an external space, and a lid member thermally welded to an opening edge portion of the container so as to cover an opening of the container,

a cover material formed of the cover material according to any one of claims 1 to 5.

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