CN108974635A - Lid material and package body - Google Patents

Abstract

The present invention relates to a cover material and a package. An object of the present invention is to provide a cover material capable of stably exerting functions such as releasing fragrance of the article for a certain period of time when using an article such as a fragrance contained in a container. The cover material (3) is a cover material used in a container (2) for storing an article (C) that performs a predetermined function by exchanging gas between the storage space and the external space, and the cover material has a gas-barrier outer surface. A layer part (3a) and an inner layer part (3b) which is detachably laminated inside the outer layer part and has air permeability. The inner part has a sealing layer (35) thermally welded to the opening edge part (2a) of the container and an adhesive layer (34) disposed outside the sealing layer and bonding the sealing layer to the outer part. The average density of the inner layer is 0.91 to 0.93 g/cm ³ .

Description

Cover and packaging

technical field

The present invention relates to a lid material, and more specifically, to a lid material used in a container for storing items such as fragrances, deodorants, moisture absorbents, etc., which pass through the storage space and the outside Articles that exchange gas between spaces to perform prescribed functions such as releasing fragrance, deodorizing, and absorbing moisture.

Moreover, this invention relates to the package which packaged articles, such as a fragrance, using the said cover material and container.

Background technique

For example, in the case of packaging a liquid fragrance, it is required to keep it in a sealed state when it is not in use, and on the other hand, it is required to prevent the fragrance from spilling out when in use, and to pass between the storage space and the external space. Gas exchange is carried out between them, so that the volatilized aromatic components are released to the external space.

The cover material described in Patent Document 1 is known as a cover material used in combination with a plastic molded container with a flange for packaging such a liquid fragrance.

Such a cover material is composed of a composite film including a base film, a barrier layer, a buffer layer, an adhesive layer, and a sealing layer laminated in this order from the outside. The adhesive layer is formed from an extruded layer of polyethylene resin. The sealing layer is formed of a polyethylene resin film. When using a fragrance, the interface between the buffer layer and the adhesive layer is peeled off, and the gas exchange is performed between the storage space in the container and the external space through the adhesive layer and sealing layer remaining on the container side. , Thus, the aromatic components are released to the external space.

prior art literature

patent documents

Patent Document 1: Japanese Patent No. 5257425

Contents of the invention

The problem to be solved by the invention

In the case of the invention of Patent Document 1, by providing a buffer layer formed of a predetermined film between the barrier layer and the sealing layer of the cover material, the content resistance of the cover material is improved, although Patent Document 1 pays attention to the above-mentioned aspect, but it does not take into account the following aspect: when using the fragrance as the content, it is controlled so that the fragrance is released stably 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 cover material capable of stabilizing functions such as fragrance release based on the article for a certain period of time when using an article such as fragrance stored in a container. play.

means to solve the problem

In order to achieve the above objects, the present invention includes the following means.

1) A cover material used in a container for storing articles that perform a prescribed function by gas exchange between the storage space and the external space,

The cover material has an outer layer part having gas barrier properties and an inner layer part which is detachably laminated inside the outer layer part and has air permeability,

The inner part has a sealing layer, and an adhesive layer disposed on the outside of the sealing layer and bonding the sealing layer to the outer part, the sealing layer is thermally welded to the opening edge of the container,

The average density of the inner layer is 0.91 to 0.93 g/cm ³ .

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

3) The lid material of the above 1) or 2), wherein the outer layer part has a base material layer, a barrier layer and a buffer layer laminated in this order from the outside.

4) The cover material of 3) above, wherein the buffer layer is formed of a polyamide resin film, and on the polyamide resin film, the corona treatment layer is formed only on the barrier layer side 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 part and the inner layer part is 0.4 to 1.5 N/15 mm.

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

The cover material is formed of any one of the above 1) to 5).

7) The package according to 6) above, wherein the article is a fragrance, a deodorant, or a hygroscopic agent.

Invention effect

The lid material of the above 1) is thermally welded to the opening edge of the container in such a way as to cover the opening of the container (which accommodates an article that performs a predetermined function through gas exchange between the storage space and the external space), thereby constituting a sealed package A package made of the above items. When using the article, the outer layer of the lid is peeled off, and gas exchange is performed between the storage space in the container and the outer space through the inner layer remaining on the container side, thereby making the article stored in the container perform the prescribed functions.

In addition, according to the lid material of the above-mentioned 1), by providing the inner layer part with a sealant layer and an adhesive layer, and setting the average density of the inner layer part to 0.91 to 0.93 g/cm ³ , the inner layer part can be accommodated The speed of gas exchange between the space and the external space is maintained stably for a certain period, and the functions of the articles stored in the container are stably performed for a certain period.

According to the cover material of the above 2), since the sealing layer is formed of a polyolefin resin film and the adhesive layer is formed of an extruded polyolefin resin layer, processing is easy and versatile, and cost can be reduced.

According to the lid material of the above 3), in the sealed and packaged state where the article is not in use, high gas barrier properties are obtained by the barrier layer of the outer layer, and even when the article as the content is a fragrance or the like, the gas barrier property is obtained by The buffer layer in the outer layer can effectively suppress the deterioration of the barrier layer and the occurrence of delamination.

According to the cover material of the above 4), the buffer layer of the outer layer part is formed of a polyamide resin film that has been corona-treated only on the side of the barrier layer, so the pinhole resistance of the inner layer part is improved. When the outer layer part and the inner layer part of the material are peeled off, the outer layer part becomes less likely to be broken, and the peelability improves.

According to the lid material of the above 5), since the peel strength between the outer layer part and the inner layer part is 0.4 to 1.5 N/15mm, the outer layer part will not be accidentally peeled off when the seal is not opened, and excellent airtightness is obtained, and it is also The outer layer portion can be easily peeled off at the time of unsealing.

According to the package of the above 6), when the article is used after the outer layer portion of the cover material is peeled off and removed, the gas between the storage space and the outer space is interposed through the inner layer portion of the cover material having the above-mentioned characteristic configuration. The speed of exchange can be maintained stably within a certain period, and the functions of the items stored in the container can be stably exerted within a certain period.

According to the packaging body of the above 7), the function of the fragrance, deodorant or moisture absorption agent, that is, releasing fragrance, deodorization or moisture absorption can be stably exerted for a certain period of time, and the above-mentioned fragrance, deodorant or moisture absorption Agents are packaged.

Description of drawings

FIG. 1 is a vertical cross-sectional view illustrating 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 above package.

Fig. 3 is a partially enlarged vertical cross-sectional view showing the unsealed state of the package.

Explanation of reference signs

1: Package body

2: container

2a: Flange (opening edge)

3: Cover material

3a: outer part

3b: inner part

31: Substrate layer

32: barrier layer

33: buffer layer

34: Adhesive layer

35: sealing layer

C: item

Detailed ways

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3 .

Fig. 1 shows the overall outline of the package of the present invention.

The illustrated package 1 includes a container 2 storing an article C, and a lid 3 thermally welded to an opening edge 2 a of the container 2 so as to cover the opening of the container 2 .

The article C stored in the container 2 as the content is an article that performs a predetermined function by exchanging gas between the storage space and the external space. Specifically, the article C is, for example, an aromatic agent, deodorant, hygroscopic agent.

The container 2 is formed of a cup-shaped resin molded body, and has a horizontal flange 2a at the edge of its upper opening. However, the shape of the container is not limited to the illustration and can be changed appropriately.

As the molding material for the container 2, a single-layer sheet or a composite sheet of two or more layers can be used. The container 2 shown in Fig. 2 and Fig. 3 is formed by the composite sheet of two-layer structure, and the layer 21 of its outside is formed by the material that has heat resistance such as polyvinyl chloride resin (PVC) film etc., and the layer 22 of its inside is made of For example, it is made of a heat-sealable material such as a polyethylene resin (PE) film. In addition, a barrier layer formed of a metal foil such as aluminum foil can be interposed between the outer layer 21 and the inner layer 22 , thereby improving the barrier properties of the container 2 .

The cover material 3 is provided with the outer layer part 3a which has a gas barrier property, and the inner layer part 3b which is laminated|stacked inside the outer layer part 3a in a detachable manner and has air permeability.

Although not shown in the illustration, a handle (Japanese: tab) protruding radially outward from a part of the peripheral portion of the cover material 3 may be integrally provided on the cover material 3 .

The outer layer part 3a of the cover material 3 has the base material layer 31, the barrier layer 32, and the buffer layer 33 laminated|stacked in order from the outer side (upper side of FIG. 2, 3).

The base material layer 31 constitutes the outer surface of the cover material 3, and it is made of, for example, a polyethylene terephthalate resin (PET) film, a polybutylene terephthalate resin (PBT) film, polyethylene naphthalate Formation of polyester resin films such as glycol ester resin (PEN) films. The thickness of the base material layer 31 is set to about 10 to 50 μm.

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

For example, when the article C as the content is a fragrance or the like, the buffer layer 33 prevents the barrier layer 32 from deteriorating due to volatilized fragrance components and the like, and delamination between the barrier layer 32 and the adhesive layer 34. role. The buffer layer 33 is preferably formed of a polyamide resin film. Of the polyamide resin film constituting the buffer layer 33, it is preferable to form a corona treatment layer (not shown) on only the surface on the side of the barrier layer 32, thereby improving the pinhole resistance of the inner layer portion 3b. In addition, when the outer layer portion 3a of the cover material 3 is peeled and opened, the outer layer portion 3a is less likely to be broken, and the peelability is improved. The thickness of the buffer layer 33 is set to about 10 to 40 μm.

The inner layer portion 3b of the lid material 3 has a sealing layer 35 thermally welded to the flange 2a of the container 2, and is arranged on the outside of the sealing layer 35 (upper side in FIGS. 2 and 3 ) so that the sealing layer 35 is bonded to the outer layer. Adhesive layer 34 on buffer layer 33 of portion 3a.

The sealing layer 35 is formed of a polyolefin-based 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-based resin such as polyethylene resin (PE), ethylene-vinyl acetate copolymer resin (EVA), or the like.

The average density of the inner layer part 3b which combines the adhesive layer 34 and the sealing layer 35 is 0.91-0.93g/cm< ³ >. Here, the "average density" of the inner layer portion 3b refers to an average density calculated from the densities of the layers 35 and 34 measured by the D method (density gradient tube method) prescribed 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 : the average density of the inner layer (Out Gassing)

D ^AD : density of adhesive layer (Adhesive)

t ^AD : thickness of the adhesive layer

D ^SL : Density of the sealing layer (Sealant)

t ^SL : thickness of sealing layer

Preferably, the melting point of the polyolefin-based resin constituting the adhesive layer 34 is 5 to 25° C. higher than the melting point of the polyolefin-based resin constituting the sealing layer 35 . Here, the "melting point" refers to a melting point measured in accordance with the method of measuring the melting temperature of plastics prescribed in JIS K7121 (2012). By making the above melting point difference 5° C. or more, when the lid material 3 is thermally welded to the flange 2 a of the container 2, adhesion starts from the sealing layer 35, and the lid material 3 does not deviate during adhesion. In addition, by If the above melting point difference is within 25° C., the buffer layer 33 will not be melted and thus will not be peeled off from other than 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. In addition, the total thickness of the inner layer portion 3b in which the sealing layer 35 and the adhesive layer 34 are combined is preferably 35 μm to 80 μm. The speed of gas exchange can be controlled by the thickness of the inner layer part 3b. By adopting the above-mentioned thickness range, for example, when the article C is a fragrance, it can release a moderate fragrance during use. The fragrance as the content is exhausted.

The method of thermally welding the lid material 3 to the flange 2a of the container 2 is not particularly limited, but a roulette seal is suitably used to obtain high sealing strength.

The cover material 3 described above can be peeled at the interface between the outer layer part 3 a and the inner layer part 3 b (that is, between the buffer layer 33 and the adhesive layer 34 ), for example, by holding the handle and pulling it up. Thus, the outer layer part 3a is separated from the container 2, and only the inner layer part 3b remains on the side of the container 2, and gas exchange is performed between the storage space in the container 2 and the outer space through the inner layer part 3b, and the fragrance of the contents is Waiting for item C to play functions such as releasing fragrance.

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

Example

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

〈Making of cover material〉

Using a two-component curing type polyester urethane resin adhesive, a polyethylene terephthalate resin (PET) film (i.e., substrate layer) with a thickness of 12 μm was dry-laminated on a substrate prepared by JIS H4160 ( 2006) on one side of the aluminum foil (ie barrier layer) with a thickness of 9 μm formed by AlN30H-O.

Next, using a two-component curing type polyester urethane resin adhesive, a polyamide resin film (that is, a buffer layer) with a thickness of 15 μm that has been corona-treated only on one side is placed so that the corona-treated layer is bonded to the aluminum foil. In contrast, dry lamination was performed on the other side of the aforementioned aluminum foil.

On the surface of the polyamide resin film side of the thus obtained laminate (i.e., the outer layer part), polyethylene resin (PE) with a thickness of 50 μm is laminated by extrusion lamination using polyethylene resin (PE). ) film (ie sealing layer). The thickness of the extruded layer of polyethylene resin (ie, adhesive layer) was made 15 μm. Here, regarding the polyethylene resin film and the polyethylene resin extruded layer, the polyethylene resin film and the polyethylene resin extruded layer having the density and melt flow rate (MFR) shown in Table 1 below were used, and the polyethylene resin extruded layer was made Table 1 shows the average density of the laminated portion (that is, the inner layer portion) of the vinyl film and the polyethylene resin extruded layer.

[Table 1]

The five types of laminates obtained by the above operations were cut into approximately circular shapes with a diameter of 45 mm, and lid materials of Examples 1 to 3 and Comparative Examples 1 and 2 were produced.

〈Packaging Production〉

Next, prepare a plurality of cup-shaped containers (the outer diameter of the flange is 40mm) formed by polyethylene resin (PE) on the inner layer side and formed by polyvinyl chloride resin (PVC) on the outer layer side as shown in Figure 1. , inner diameter is 35 mm), and 3 cc of liquid fragrance is filled into each container. Use A, B, C three fragrances.

Next, the lid materials of Examples 1 to 3 and Comparative Examples 1 and 2 were placed on the flange upper surfaces of the respective containers filled with fragrances A, B, and C so that the sealing layer faced the flange, and the two or thermal welding. Thermal welding was performed with a knurl seal under the conditions of a heating temperature of 160° C., a pressing pressure of 0.2 MPa, 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 produced.

<Verification of changes in fragrance permeability>

The lid materials of the packages of Examples 1 to 3 and Comparative Examples 1 and 2 were peeled between the polyamide resin film and the polyethylene resin extruded layer, so that only the polyethylene resin extruded layer and the polyethylene resin extruded layer remained on the container side. The state of the resin film was stored in a room temperature environment for one month in this state.

During storage, the weight of each package was measured every other week, and the weight difference from before storage was calculated to confirm the change in the permeability of the fragrance. Next, the case where the change in the transmittance was stable over a period of one month was judged as "◯", and the case where it was not stable was judged as "×". 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 the transmittance was stable for one month regardless of the fragrance, and the fragrance was released stably. In addition, in the case of the package of Example 3, the change in the transmittance was substantially stable over a period of one month for some fragrances. On the other hand, in the packages of Comparative Examples 1 and 2, the change in transmittance was not stable.

Industrial availability

The present invention can be suitably used as, for example, packaging materials for fragrances, deodorants, hygroscopic agents, and the like.

Claims (7)

1. lid material uses in the container stored to article, the article by storage space and exterior space it Between carry out gas exchanges and play predetermined function,

The lid material has outer layer portion and internal layer portion, and the outer layer portion has barrier properties for gases, and the internal layer portion is can remove Mode be laminated in outer layer portion inside and have gas permeability,

Internal layer portion has sealant and is configured at the outside of sealant and sealant is bonded in the adhesive layer in outer layer portion, described Sealant is heat fused in the opening edge of container,

The averag density in internal layer portion is 0.91~0.93g/cm³。

2. lid material as described in claim 1, wherein sealant is formed by polyolefin-based resins film, and adhesive layer is by polyolefin The extruding layer of resin is formed.

3. lid material as described in claim 1, wherein outer layer portion has substrate layer successively laminated since outside, barrier layer And buffer layer.

4. lid material as claimed in claim 3, wherein buffer layer is formed by polyamide resin, on polyamide resin, only Corona processing layer is formed on the face of the barrier layer side in the two sides of polyamide resin.

5. lid material as described in claim 1, wherein the peel strength in outer layer portion and internal layer portion is 0.4~1.5N/15mm.

6. package body is heat fused in the lid material of the opening edge of container with container and in a manner of the opening for covering container, The container is accommodated with the article that predetermined function is played and carrying out gas exchanges between storage space and exterior space,

Lid material is formed by lid material according to any one of claims 1 to 5.

7. package body as claimed in claim 6, wherein article is aromatic, deodorant or hygroscopic agent.